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97results about How to "Increase the volume of the transformation" patented technology
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Method suitable for effective flow guide for fractures in fracturing of shale oil pool reservoir
ActiveCN106907137AImprove diversion capacityIncrease "retrofit volumeFluid removalMicro fractureFracturing fluid
The invention relates to the technical field of hydraulic fracturing capacity increasing revamping of oil and gas reservoirs, in particular to a method suitable for effective flow guide for fractures in fracturing of a shale oil pool reservoir. The method includes the following steps that A, the reservoir is pretreated through acid liquor; B, the main fracture is constructed through low-viscosity fracturing fluid; C, the micro fractures and the branch fractures are opened by injecting low-viscosity slickwater; D, slugging is conducted by injecting low-viscosity acid liquor and low-viscosity slickwater alternately; E, low-viscosity slickwater carrying a proppant and low-viscosity fracturing fluid carrying a proppant are injected in sequence so as to support a micro fracture system and a branch fracture system, and the first proppant is different from the second proppant; F, intermediate-viscosity fracturing fluid carrying proppants is injected so as to support a main fracture system; and G, the fourth proppant in a shaft is completely displaced to the openings of the fractures by means of the low-viscosity slickwater.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method applied to evaluation of flow conductivity of shale-gas-combined sand fracturing fracture
The invention discloses a method applied to evaluation of flow conductivity of shale-gas-combined sand fracturing fracture. The method comprises the following steps: a, simulating a sand bar transporting process in shale-gas-slickwater-combined sand fracturing fracture by means of an experiment device for simulating flowing of proppants in a visual fracture net to obtain sand bar transporting video of the combined sand fracturing fracture under different experiment conditions; b, obtaining a distribution curve of the proppants with different particle diameters by virtue of a gray processing method and a point-by-point scanning method and obtaining distribution shape function of the proppants with different particle diameters by virtue of a linear regression method; c, building the sand bar distribution shape function of an API flow guide chamber by utilizing geometric similarity principle according to the size of the API flow guide chamber, paving shapes of the corresponding proppants and implementing evaluation of flow conductivity of shale-gas-combined sand fracturing fracture. The method is capable of simply and accurately implementing quantitative evaluation of the flow conductivity of shale-gas-combined sand fracturing fracture; experiment support is provided for optimizing the combined sand fracturing design and improving the flow conductivity of the shale fracturing fracture.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Recognition and interpreting evaluation method for shale reservoir fractured fractures
ActiveCN106988739ARealize numerical representationReduce manufacturing costFluid removalCognitionHydraulic fracturing
The invention discloses a recognition and interpreting evaluation method for shale reservoir fractured fractures. The recognition and interpreting evaluation method mainly comprises the steps of hydraulic fracture dynamic recognition of a shale reservoir under different stratum prestress conditions, three-dimensional natural fracture and hydraulic fracture network reconstruction and fracture network recognition and interpretation based on microseismic monitoring. The recognition and interpreting evaluation method achieves complex fracture network distribution form cognition and evaluation on the basis of hydraulic fractured fracture dynamic recognition and fracture comprehensive correction of microseismic monitoring interpretation to guide a fracture optimally designed fracture-microseism integrated fracture network prediction and evaluation technology and has important production significance for optimizing fracture construction parameters such as the fracture construction scale, the discharge capacity and the sand adding quality, reducing production cost and improving the fracture improvement effect.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Hydraulic fracturing and methane in-situ blasting cooperative fracturing permeability-increasing method
ActiveCN113294134ARealize synergistic fracturing and anti-reflectionIncrease the volume of the transformationFluid removalWell/borehole valve arrangementsMining engineeringWell drilling
The invention relates to a hydraulic fracturing and methane in-situ blasting cooperative fracturing permeability-increasing method which is suitable for shale gas reservoir exploitation. The method comprises the steps that horizontal drilling construction is conducted on a to-be-constructed area, and then cracks are formed around the hole wall of a horizontal drill hole through energy-gathered perforation; the cracks around the horizontal drill hole continue to be expanded in a hydraulic fracturing mode, and methane extraction is conducted after fracturing fluid is discharged; after methane gas is reduced, in-situ blasting fracturing is conducted on methane participating in the horizontal drill hole; after blasting, the cracks in the horizontal drill hole continue to be expanded, so that the methane continues to seep, and then extraction continues to be conducted; and blasting fracturing and extraction operation are repeated, so that blasting cooperative fracturing permeability increasing is achieved, and the shale gas exploitation effect is greatly enhanced. The method is reasonable in design, high in construction operation feasibility and suitable for fracturing transformation of unconventional oil and gas reservoirs such as shale gas reservoirs, coal bed gas reservoirs and tight sandstone gas reservoirs.
Owner:CHINA UNIV OF MINING & TECH
Method for fracturing multiple horizontal bedding fissures of shale gas
InactiveCN106545324AHigh degree of controlIncrease the volume of the transformationFluid removalShale gasEnvironmental geology
The invention discloses a method for fracturing multiple horizontal bedding fissures of shale gas. The method includes the steps of carrying out acid pretreatment on a target shale bed to lower the fracturing pressure of shale beds; carrying out first-stage fracturing treatment on the target shale bed subjected to the acid pretreatment to lower the extension speed of fractures of the shale beds; carrying out second-stage fracturing treatment on the target shale bed subjected to the first-stage fracturing treatment to increase the length of the fractures of the shale beds; and carrying out propping agent filling and supporting on the target shale bed subjected to the second-stage fracturing treatment to maintain complex fractures formed by fracturing. According to the method, the control degree of the fractures of the shale beds can be improved, the modified size can be increased, and the post-fracturing effect can be improved.
Owner:CHINA PETROLEUM & CHEM CORP +1
Constant-pressure deep shale gas volume fracturing method
ActiveCN109424347ANet pressure dropEffectively press openFluid removalReservoir volumeHydraulic fracturing
The invention discloses a constant-pressure deep shale gas volume fracturing method. The method includes the steps of (1) evaluation of key reservoir characteristic parameters; (2) fracturing coefficient evaluation and perforation position determination; (3) perforation operation; (4) acid pretreatment operation; (5) optimization of crack parameters and overall construction parameters; (6) acid formulation optimization for intermediate acid injection; (7) first-stage mixed injection construction; (8) second-stage mixed injection; (9) third-stage mixed injection; (10) fracturing construction ofthe next segment after displacement, and repetition of the steps (4), (7) and (9). The method can exploit the deep shale gas reservoir yield increasing potential to the maximum, increase the fracturing success rate and meet the deep shale gas reservoir volume fracturing requirement and is beneficial to application and promotion of the hydraulic fracturing technology.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method and system for optimizing spacing of shale fracture network perforation clusters
ActiveCN106285598AIncrease the volume of the transformationGood application prospectFluid removalNatural fractureEnvironmental geology
The invention provides a method and system for optimizing spacing of shale fracture network perforation clusters. The method and system analyze and solve changes of induced stress during full three-dimensional expansion of multiple fractures in the case of multiple perforation clusters by employing finite element numerical simulation, local maximum and minium horizontal main stress difference around fractures is eliminated by using inter-fracture stress interference, local horizontal main stress of a stratum is approximately isotropic, a local optimum stress field is formed, main facture diverting and natural fracture opening are promoted, and a network of fractures is thus formed.
Owner:CHINA PETROLEUM & CHEM CORP +1
Downhole directional hydraulic jetting tool ground control method
InactiveCN107227948AAvoid misuseHigh torqueLiquid/gas jet drillingDirectional drillingEngineeringMaterial Perforation
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Multi-cluster perforation fracturing method with variable perforation size and variable perforation density and uniform liquid feeding and sand feeding
ActiveCN109958416AImprove uniformityIncrease the volume of the transformationFluid removalMulti clusterFracturing fluid
The invention discloses a multi-cluster perforation fracturing method with a variable perforation size and variable perforation density and uniform liquid feeding and sand feeding. The multi-cluster perforation fracturing method is characterized in that the displacement of each cluster perforation is equal, and is equal to the total injection displacement divided by the number of clusters of perforations in segments. The multi-cluster perforation fracturing method comprises the steps that (1) key reservoir parameters are evaluated; (2) segment cluster locations are determined; (3) crack parameters are optimized; (4) fracturing construction parameters are optimized; (5) adjacent well segment cluster is subjected to liquid feeding and proppant feeding monitoring parameter analysis; (6) average displacement of each cluster of perforations is subjected to distribution; (7) pressure of the wellbore at each cluster of perforations of a horizontal wellbore is calculated; (8) adjustment of thenumber of perforations and aperture of each cluster perforations are performed; (9) fine adjustment of overall cluster perforation scheme in the segments is performed; (10) a bridge plug is lowered and the cluster perforations are subjected to joint operation; (11) acid pretreatment and prepad liquid width generating and sand-carrying fluid sand feeding are performed; and (12) replacement operation is performed. The multi-cluster perforation fracturing method increases the uniformity of liquid feeding and sand feeding between the perforation clusters, improves the distribution of the fracturing fluid and the proppant between the perforation clusters, increases the overall transformation volume of the cracks, and maximizes the reservoir yield-increasing effect.
Owner:CHINA PETROLEUM & CHEM CORP +1
Coal bed gas U-shaped well staged fracturing exploitation technology
Owner:CNPC GREATWALL DRILLING ENG
Method for optimizing multi-section fractured horizontal well network crack parameter
ActiveCN106321051AEffective Fracturing ConstructionEffectively guide fracturing constructionFluid removalSpecial data processing applicationsComputer scienceBuilding construction
Owner:CHINA PETROLEUM & CHEM CORP +1
Atmospheric shale gas volume fracturing method using horizontal wellbore which bores through multiple layers
ActiveCN107780913AEffectively press openIncrease the volume of the transformationFluid removalSpray nozzleHydraulic fracturing
The invention discloses an atmospheric shale gas volume fracturing method using a horizontal wellbore which bores through multiple layers. The method comprises the steps of (1) reservoir evaluation before fracturing; (2) fracture three-dimensional extension scale simulation and analysis; (3) hydraulic jetting perforating parameter designing, wherein hydraulic nozzles are distributed in the same plane, fractures with no special requirements on upward extension or downward extension are evenly distributed at the same plane, and for fractures which need to excessively extend upwards or downwards,an uneven hole arrangement mode is adopted in the upper semi-circumference position or the lower semi-circumference position on the cross section of a hydraulic jetting pipe string; (4) injection mode designing, wherein a high-viscosity glue solution is adopted for the injection mode, and a pre-injection mode is conducted while matched with the designed maximum delivery; (5) variable-density supporting agent optimization; (6) real-time improvement of construction parameter designing and adjustment of the main fracture net pressure. By means of the method, the yield-increasing potential of a shale gas reservoir is tapped to the utmost extent, and the success rate of fracturing is improved; the requirements of volume fracturing of the shale oil and gas reservoir are met, and the method is beneficial to application and popularization of a hydraulic fracturing technology.
Owner:CHINA PETROLEUM & CHEM CORP +1
Ordinary-pressure shale gas screen pipe completion hydraulic injection volume fracturing method
ActiveCN108952655ARaise the level of developmentReduce development costsFluid removalAbrasive blastingInjection volume
The invention discloses an ordinary-pressure shale gas screen pipe completion hydraulic injection volume fracturing method. The ordinary-pressure shale gas screen pipe completion hydraulic injection volume fracturing method comprises the steps that (1) evaluation of key parameters of a shale before fracturing is performed; (2) the hydraulic injection position is determined; (3) fracture parametersare optimized; (4) fracturing construction parameters are optimized; (5) sandblasting perforation fracturing operation is performed through large diameter coiled tubing or 3<1 / 2>in conventional tubing; (6) acid pretreatment operation is performed; (7) low-viscosity slickwater fracturing fracture-forming construction is performed, and low-viscosity slickwater with the viscosity of 1mPa.s-2mPa.s isadopted for communicating and extending more small micro-scale fracture systems; (8) low-viscosity slickwater 70 mesh-140 mesh proppant injection construction is performed; (9) high-viscosity glue solution sand fracturing construction is performed; and (10) displacing operation is performed. The ordinary-pressure shale gas screen pipe completion hydraulic injection volume fracturing method can ensure that multi-cluster volume fracturing construction is performed on an ordinary-pressure shale gas horizontal well, can greatly increase the transforming volume of an ordinary-pressure shale gas fracturing fracture, and improves the development level of ordinary-pressure shale gas. The development of the ordinary-pressure shale gas becomes cost-effective.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for increasing fracturing volume in tight sandstone reservoir
ActiveCN110761762AIncrease in sizeImprove seepage capacityFluid removalMicro fractureHydraulic fracturing
The invention discloses a method for increasing the fracturing volume in a tight sandstone reservoir. The method includes the steps that (1) micro-fractures are formed in the tight sandstone reservoir; step (2) the micro-fractures are expanded and communicated; step (3) hydraulic fracturing is performed to form main fractures; and step (4) a proppant is turned from temporary blocking to form branch fractures. The method is suitable for fracturing transformation production increase operation of the tight sandstone reservoir with micro-fractures not developed. Through innovative process ideas, first, a large number of radial micro-fractures are artificially generated in a sandstone reservoir with the micro-fractures not developed and a dense matrix, then the main fractures penetrating through the micro-fractures are formed through hydraulic fracturing, and in the extension process, the main fractures are turned for multiple times, so that a complex fracture system is formed, and the fracturing transformation volume is increased and the production increase effect is improved.
Owner:CHINA PETROLEUM & CHEM CORP +1
Small fracturing test method suitable for shale gas well
ActiveCN106894802AIncrease the volume of the transformationImprove fracturing effectFluid removalShale gasNatural fracture
The invention provides a small fracturing test method suitable for a shale gas well. The method comprises the following steps that (1) acid pretreatment is conducted, (2) the stable injection time and liquid quantity of the highest discharging quantity are determined; (3) step increasing is conducted, specifically, the discharging quantity is gradually increased to the highest discharging quantity in a stepped mode; (4) step decreasing is conducted, specifically, the discharging quantity is gradually decreased from the highest discharging quantity in a stepped mode; and (5) pressure decreasing testing is conducted, specifically, after fracturing pumping stopping, pumping stopping and well shutdown are conducted for a preset time till an inflection point appears at the pressure decreasing curve. According to the small fracturing test method suitable for the shale gas well, key characteristic parameters, such as the minimum horizontal principal stress, the fracture closure time, the natural fracture development degree and the stratum leak-off condition, of a shale formation can be obtained, the effect of fractural diverting inducing is achieved, a foundation is laid for fractural diverting or complex fracture forming in main fracturing, the transformation size of main fracturing is increased, and the fracturing effect of main fracturing is improved. The small fracturing test method is reasonable in design, simple in technique and convenient to operate.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for improving complexity of fracture and construction efficiency of horizontal well
InactiveCN104695924AIncrease the volume of the transformationIncrease productionFluid removalPrincipal stressHorizontal wells
The invention discloses a method for improving the complexity of a fracture and the construction efficiency of a horizontal well, and is designed to solve the problems, such as low complexity and small discharge volume of the fractured fracture of the horizontal well. The method is characterized in that a plurality of the horizontal wells are deployed in the same well site, shafts of the horizontal wells are parallel mutually, and each shaft is perpendicular to a maximum principal stress direction of a stratum; positions of perforated intervals of each adjacent well are distributed in a staggered manner; each adjacent well is fractured in sequence in a staggered manner. In the process of fracturing, as each shaft is subjected to stress interference caused by staggered fracturing in sequence, a large amount of high-complexity microfractures in staggered distribution are generated on both sides of each fracture, thus the reconstruction volume of an oil layer is increased, and the single-well yield is improved. In addition, the intervals between the fracturing sections of the horizontal wells are lengthened, thus the number of the fracturing sections can be decreased, the single-well fracturing cycle can be shortened, and the construction efficiency can be greatly enhanced.
Owner:PETROCHINA CO LTD
Method for repeated fracturing of horizontal well
ActiveCN110761763AEffective Guidance for Refracturing ConstructionReasonable designFluid removalHorizontal wellsFracturing fluid
The invention discloses a method for repeated fracturing of a horizontal well. The method includes the steps that (1) parameter evaluation and optimization before repeated fracturing is conducted; (2)repeat fracturing is conducted along old fractures or novel holes are re-shot between the old fractures; (3) slickwater and carbon dioxide foam fracturing fluid are subjected to formulation optimization and preparation; (4) the slickwater and the carbon dioxide foam fracturing fluid are injected for main fracture fracturing or extension; (5) proppant injection construction is conducted; (6) replacement operation is conducted; (7) step (4) to (6) are repeated until construction is completed. The effect of repeated fracturing and reforming of a shale gas reservoir are greatly improved, the optimized results can effectively guide repeated fracturing construction, the reconstruction volume is greatly increased, the construction effect is significantly improved, and thus the greatest economicbenefits are obtained.
Owner:CHINA PETROLEUM & CHEM CORP +1
Spacing optimizing method for horizontal well volume fracturing clusters
InactiveCN107237616AIncrease the volume of the transformationSerious deflectionFluid removalSteering angleFinite element software
The invention provides a spacing method for horizontal well volume fracturing clusters. A finite element numerical simulation method is adopted, on the basis of ABAQUS finite element software, from the two aspects of reduction of the disadvantageous influence of the stress penumbra effect and utilization of the advantageous influence of the stress penumbra effect, a smallest cluster spacing optimizing model and a largest transformed volume cluster spacing optimizing model are built; the stress steering angle and the transformed volume are calculated; and finally, the optimal cluster spacing is determined by combining the optimized result of the smallest cluster spacing and the largest transformed volume cluster spacing. On the one hand, major fractures successively extend out, a horizontal well is segmentally fractured into a stratum to form the multiple major fractures, and on the other hand, the induced stress between the fractures is large as possible, so that branched fractures turn, the connectivity of natural fractures including the branched fractures and the major fractures is enhanced, a channel structure of oil gas flowing towards the major fractures is improved, and finally the purpose for improving the production capacity of an oil gas well is achieved.
Owner:CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
Method for improving effective modification volume through refracturing of shale gas horizontal well
PendingCN110359899AEffective Guidance for Refracturing ConstructionReasonable designFluid removalEconomic benefitsConstruction design
The invention discloses a method for improving the effective modification volume through refracturing of a shale gas horizontal well. The method comprises the steps that (1) reservoir assessment is carried out before refracturing; (2) the position of a refracturing partial pressure segment cluster is confirmed; (3) a partial pressure method is selected; (4) activated water is injected to make up formation pressure; (5) low-viscosity slickwater seam expansion is carried out; (6) low-viscosity slickwater and small-particle-size supporting agent sand carrying is carried out; (7) the high-viscosity slickwater foam liquid construction stage is carried out; and (8) other processes of replacement, drilling and plugging, liquid drainage, production and the like are carried out. According to the method, reliable bases are provided for refracturing construction design of a shale gas pool. Refracturing construction of the shale gas pool can be effectively guided, the modification volume can be greatly increased, the construction efficiency can be obviously improved, and therefore the maximum economic benefits are obtained.
Owner:CHINA PETROLEUM & CHEM CORP +1
Method for transforming coal-bed gas well into coal-measure gas well
ActiveCN107654215APrevent water sensitive damageIncrease the volume of the transformationFluid removalDrilling compositionStress profileEnvironmental geology
Disclosed is a method for transforming a coal-bed gas well into a coal-measure gas well. The method comprises the following steps that (1) the ground coal-bed gas well to be transformed is selected; (2) an indoor reservoir damage test is conducted on coal rock samples collected by coring the ground coal-bed gas well in the step (1), and a low damage fracturing fluid is prepared; (3) a layer section to be transformed is determined according to the ground stress profile, the TOC profile and the rupture pressure profile, and a re-perforating perforation layer is determined according to the relative position relationship of early-stage coal-bed perforation situations, coal rock body structures and the low damage fracturing fluid with the anti-swelling rate and coal rock layers of mud rock, anda re-perforating perforation plan is established; (4) a fracturing mode of transforming each layer section for multi-layer section transforming is determined, except for the uppermost layer section,the rest of the layer sections adopt oil pipe + packer fracturing, and the fractured layer sections are blocked by using sand filling or a packer; and (5) the low damage fracturing fluid and a supporting agent are pump-cast by stages.
Owner:HENAN POLYTECHNIC UNIV
Horizontal well back-mixing, fracturing and pumping-in method for compact reservoir oil deposit
InactiveCN111236913AIncrease the volume of the transformationImprove well productivityFluid removalPhysicsGeotechnical engineering
The invention provides a horizontal well back-mixing, fracturing and pumping-in method for a compact reservoir oil deposit. The horizontal well back-mixing, fracturing and pumping-in method comprisesthe following steps: a first prepad fluid stage, wherein the first prepad fluid is injected into a target measure layer, and the first prepad fluid is high-viscosity fracturing fluid; a second prepadfluid stage, wherein second prepad fluid is injected into the target measure layer and a supporting agent is added in a slug mode, and the second prepad fluid is low-viscosity fracturing liquid; a sand-carrying fluid stage, wherein sand-carrying fluid is injected into the target measure layer, and the supporting agent is continuously added, and the sand-carrying fluid is high-viscosity fracturingliquid. Through a back-mixing, fracturing and pumping-in process of sequentially injecting the fracturing liquid into the target measure layer according to a sequence, from high to low and then from low to high, of viscosity of the fracturing liquid, so that effective formation of a complex seam net is realized while multiple perforation clusters in horizontal wall multi-section fracturing are ensured to be fractured in a balanced mode, and therefore, modification area is increased, and the oil well yield is increased.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Composite temporary plugging steering repeated fracturing method suitable for shale gas long horizontal well
InactiveCN110924918AIncrease the volume of the transformationLow costFluid removalDrilling compositionMining engineeringHorizontal wells
The invention discloses a composite temporary plugging steering repeated fracturing method suitable for a shale gas long horizontal well, and the method comprises the following steps: performing squeezing construction, and supplementing energy to a pressure failure area of an old well; performing multi-stage steering main fracturing, and dredging old fractures; plugging a hole of a primary fracturing part through a temporary plugging ball, and then performing sand fracturing construction through fracturing fluid, and reconstructing a primary fracturing under-transformation area; enabling the fracturing fluid to carry an in-fracture diverting agent, so as to promote the steering of the fracture, and improve the fracture complexity; after the diverting agent in the fracture reaches the stratum, continuing the sand fracturing construction, and further reconstructing the primary fracturing insufficient and unmodified areas. According to the invention, a tubular column does not need to be tripped in or dragged, the field construction operability is high, the construction period is greatly shortened, the cost is low, the utilization rate of the horizontal section of the shale gas horizontal well can be increased, the shale gas well is recovered or the productivity is increased, low-cost repeated fracturing transformation of the shale gas long horizontal well is met, and the economicbenefits of a shale gas field are increased.
Owner:CHINA PETROLEUM & CHEM CORP +1
Multistage dynamic temporary blocking volume acid fracturing method
InactiveCN110259429AImprove targetingImprove diversion capacityFluid removalDrilling compositionFiberAcid fracturing
The invention discloses a multistage dynamic temporary blocking volume acid fracturing method. According to the multistage dynamic temporary blocking volume acid fracturing method,"multistage physical temporary blocking" and "multistage chemical temporary blocking" are treated as principle thinking, and multistage hydraulic fracturing with sand and multistage injection acid fracturing are combined. According to pump injection sequence of front-loading linear glue with certain concentration to make seams, saturating a reservoir, improving flow conductivity of fractures by propping agents with the small grain size or composite grain size, and injecting degradable acid-resistant fiber temporary blocking fluid, through multistage with large displacement, the fracture physical steering transformation is achieved; and then through a multistage interval type with large displacement, different types of acid liquors "mutual solvent, gelled acid, steering acid..., mutual agent" are injected, and thus fracture chemical temporary blocking steering transformation is achieved. According to the multistage dynamic temporary blocking volume acid fracturing method,the pertinence and the flow conductivity of the reservoir are improved, the loss of the acid liquors are lowered, the etching length of the fractures are increased, the transforming volume of the reservoir is enlarged by fracture steering, and thus the target that the individual well producing rate is improved by effective transformation of the cloud-like carbonate rock reservoir is achieved.
Owner:PETROCHINA CO LTD
Radial multi-branch drilling and temporary plugging fracturing combined well completion method and device, and application
ActiveCN108825199AIncrease the volume of the transformationIncreased fracture volumeFluid removalSealing/packingUnconventional oilWater jet
The invention provides a radial multi-branch drilling and temporary plugging fracturing combined well completion method and device, and application. The radial multi-branch drilling and temporary plugging fracturing combined well completion method comprises the steps that data interpretation results such as earthquakes, well logging and oil reservoir numerical simulation are comprehensively utilized, and a high-pore pressure region reservoir is determined; casing cutting window is completed, and multi-branch radial holes are drilled in the high-pore pressure region reservoir through high-pressure water jet spraying drill bits conveyed by a continuous pipe and a high-pressure hose; and the continuous pipe, the high-pressure hose and the spraying drill bits do not need to be pulled out, temporary plugging fracturing liquid containing a temporary plugging agent is pumped directly through the continuous pipe to fracture the radial holes, and pipe string radial multi-branch drilling and temporary plugging fracturing combined well completion is achieved. A high-pressure area with rich reserves directionally communicates through the multi-branch holes, fracturing cracks are induced to beinitiated, meanwhile, a temporary plugging agent material plugs the dominant cracks extending towards a low-pressure area, thus the cracks turn to the high-pressure area, effective communication and utilization of the reserves in the high-pressure area are achieved, and the unconventional oil and gas recovery rate is increased.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Fine layering reconstruction method
ActiveCN107766637AIncrease productionHigh yieldData processing applicationsDesign optimisation/simulationWell drillingWell logging
The invention relates to a fine layering reconstruction method. The method includes the following steps: S101, collecting geology, well drilling, well detection, well logging and well cementation dataand production situations of a to-be-fractured well, calculating rock mechanics parameters, and determining a well completion mode and a perforation scheme; S102, designing a fracturing scheme, and determining the number of fracturing fissures and parameter optimization, wherein parameter optimization includes sand adding scale optimization with continuous section interpretation of ground stressas a basis, construction parameter optimization with obtaining of expected fissure support as a target, and fracturing optimization control with test fracturing as a basis; and S103, ensuring fracturing fluid performance, adjusting a main fracturing pump sequence and providing a temporary plugging agent in a construction process to ultimately increase single-well yield and control reserves. According to the fine layering reconstruction method provided by the invention, the complex network fissures can be formed, a larger reconstruction volume can be obtained, and then the single-well yield andoil and gas recovery ratios are significantly increased. In addition, the method is simple to operate, is lower in costs, and has important significance for development of oil and gas fields.
Owner:大庆中联信实石油科技开发有限公司
Method for promoting balanced expansion of multiple clusters of fractures through ball throwing temporary plugging
ActiveCN111648755AImprove imbalanceIncrease the remodeling areaFluid removalSealing/packingReservoir typeMining engineering
The invention discloses a method for promoting balanced expansion of multiple clusters of fractures through ball throwing temporary plugging. The method comprises the following steps that the whole fracturing construction process of one fracturing section is divided into N stages, and first-stage fracturing is implemented, wherein different types of combined fracturing fluids capable of promotingcrack initiation and expansion are injected into a wellbore; second-stage fracturing is implemented, wherein fracturing fluids are injected continuously, degradable temporary plugging balls are put into the wellbore to be used for temporarily plugging holes of perforation clusters to limit expansion of dominant hydraulic fractures, and fracturing fluids are injected continuously to promote expansion of non-dominant fractures; the subsequent several stages of fracturing construction processes are performed similar to the second-stage fracturing construction process until the construction of thefracturing section is completed; and subsequent construction of other fracturing sections is completed according to the above process, and finally balanced fracturing transformation of the whole horizontal section reservoir is realized. According to the method, the unbalanced expansion phenomenon of multi-cluster fractures can effectively relieved, the reservoir transformation volume is increased, the oil and gas recovery ratio is increased, and the method is widely suitable for various reservoir types.
Owner:CHINA PETROLEUM & CHEM CORP +1
Three-level compound petroleum yield increasing method
The invention relates to a three-level compound petroleum yield increasing method. The method comprises the following steps that 1, a core sample is selected to conduct an acid solution ratio experiment, an acid-etched fracture conductivity experiment, and a fracture conductivity experiment of a placing propping agent, the acid solution ratio is measured through the acid solution ratio experiment, flow conductivity parameters are measured through the acid-etched fracture conductivity experiment and the fracture conductivity experiment of the placing propping agent respectively, the yield is predicted based on the measured flow conductivity parameters, and if the acid solution ratio is above 20% and the predicted yield reaches an index value, an acid fracturing, hydraulic sand fracturing and matrix acidizing three-level compound yield increasing method is selected and conducted; 2, according to the sequence of acid fracturing, hydraulic sand fracturing and matrix acidizing, the acid fracturing, hydraulic sand fracturing and matrix acidizing are conducted for increasing the petroleum yield respectively.
Owner:CHINA PETROLEUM & CHEM CORP +1
New method for increasing reservoir reconstruction volume through subdivision cutting and temporary plugging steering combined technology
ActiveCN109611062AIncreased complexityMaximum use volumeFluid removalSealing/packingHigh densityFracturing fluid
The invention relates to a new method for increasing the reservoir reconstruction volume through a subdivision cutting and temporary plugging steering combined technology, and belongs to the field ofpetroleum and natural gas exploitation. The invention aims to provide the new method for increasing the reservoir reconstruction volume through the subdivision cutting and temporary plugging steeringcombined technology to solve problems, subdivision cutting of a horizontal well is achieved through fast drilling bridge plugs and high-density clustered jet holes, and fracturing fluid and active fluid are injected to open a first-stage artificial fracture in a pressing mode; then sand-carrying fluid containing cleaning steering material fluid is injected to temporarily plug the fracture which ispressed to be open before and a blast hole, the fracture is forced to steer longitudinally, and displacement fluid is used for displacing; and finally a fracture lattice structure is formed. According to the new method, through an adopted subdivision cutting method, high-density artificial fracture well completion is conducted to sufficiently cut a reservoir so as to achieve reservoir working volume maximization, and the production efficiency of all jet hole clusters can be improved by combining with a temporary plugging steering technology; and meanwhile, large-displacement fracturing construction is conducted, the complexity degree of the artificial fractures can be increased, the petroleum leakage area is increased, and the reservoir reconstruction volume is increased.
Owner:CHINA UNIV OF PETROLEUM (BEIJING) +2
Method for production increasing through repeated transformation based on complex crack network
InactiveCN108266171AIncrease the volume of the transformationIncrease productionFluid removalThroatWax
The invention provides a method for production increasing through repeated transformation based on a complex crack network. Formation wax and inorganic scale are removed by means of the method that plug removal liquid is injected into a target layer section, then repeated fracturing construction is conducted in a support-free mode, the reservoir transforming volume is enlarged, formation energy isreplenished, fracturing liquid does not flow back after fracturing construction is completed, and by shutting in a well for pressure enlarging, old-well production increasing is achieved. According to the method for production increasing through repeated transformation based on the complex crack network, firstly, by adopting the large-displacement, low-frictional-resistance-slickwater, and support-free modes, repeated fracturing construction is conducted, based on the original complex crack network, the reservoir transforming volume is further enlarged, and the stratum energy is replenished;and secondly, by shutting in the well, under the pressure effect of capillarity tubes, low-frictional-resistance slickwater and remaining oil in medium and small pore throats or matrixes are subjectedto dialysis replacement, and thus the oil well yield and the final recovery percent are increased.
Owner:PETROCHINA CO LTD
Crack forming method for multiple scales of cracks
The invention discloses a crack forming method for multiple scales of cracks. The crack forming method comprises the following steps that basic parameters comprising micro pore-throat structure parameters, rock mechanics parameters and ground stress characteristics of a rock core of a reservoir stratum are measured; artificial rock samples are prepared according to the basic parameters, physical simulation experiments for rock core crack rupture and extension are carried out on the artificial rock samples, and the rupture pressure characteristics and elongation characteristics of the artificial rock samples under different fracturing fluid viscosity and displacement combination are determined; based on the rupture pressure characteristics and elongation characteristics determined by the physical simulation experiments, a crack forming technology for the two or more levels of scales of cracks is determined through a reservoir crack extension physical simulation system; and sequential crack forming construction of the multiple scales of cracks is conducted according to the crack forming technology. According to the crack forming method, the complexity of the fracturing cracks can beincreased, the crack forming success rate of the complex cracks is increased, thus the reservoir transformation volume is increased, and efficient production increasing and stable production are achieved.
Owner:CHINA PETROLEUM & CHEM CORP +1
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