33results about How to "Rapid flowback" patented technology

The invention discloses a method for solving a water lock effect. By adopting the method, functional powder is added to a duct for producing a water lock, so as to remove the water lock. The functional powder is mixed powder formed by amphiphilic powder or super-hydrophilic powder and hydrophobic powder; the grain density of the functional powder is greater than 1 g/cm<3>; the mean grain size of the functional powder is smaller than 100 microns. The method disclosed by the invention is simple and feasible, convenient to operate, wide in material source, and low in cost. Meanwhile, the liquid-phase interfacial tension can be reduced by the functional powder in the using process of the method disclosed by the invention; the functional powder is in a small-granule solid state, so that the functional powder is easily left in a small hole or a gap in the rock surface, and has strong durability on inhibition of a damage of the water lock. In addition, compared with an acidification method, the flow-back effect of the method is greatly improved, so that the water lock effect can be better solved; the productivity of an oil well is greatly also improved.

The invention discloses a method of fracturing a coal-bed gas reservoir and belongs to the field of coal-bed gas exploitation. The method comprises following steps: after perforation in a middle-upper part of the coal bed and a coal bed top board above the coal bed, active water fracturing fluid is pumped and injected in the coal bed top board to form a first crack; low sand ratio sand-carrying fluid and high sand ratio sand-carrying fluid are successively pumped and injected into the first crack, and a second crack communicated with the first crack is formed in the coal bed, and the extension of the second crack is promoted to form multiple branchlike cracks containing sand support agent. The low sand ratio sand-carrying fluid comprises following components by percentage of mass: 0.1-0.3% carboxymethyl hydroxypropyl guanidine gum, 1-2% KCl, 0.5-1% discharge aiding agent, 8-12% sand support agent, and water as balance; the high sand ratio sand-carrying fluid comprises following components by percentage of mass: 0.1-0.3% carboxymethyl hydroxypropyl guanidine gum, 1-2% KCl, 0.5-1% discharge aiding agent, 12-48% sand support agent, and water as balance. The method provided by the invention can form a long distance supporting seam network in the coal-bed gas reservoir, and effectively improve the yield of the coal-bed gas reservoir.

The invention discloses a method for detonation fracture acidizing combined operation. The method comprises the steps of optimizing detonation fracture acidizing combined operation process parameters, performing operation preparation before detonation fracture and filling a pitshaft with liquid, testing stratum absorption amount before the detonation fracture, placing a detonation fracture operation tubular column to a predetermined operation depth, performing pressurization detonation of the tubular column, performing well killing operation, detonating the fracture operation tubular column, testing the stratum absorption amount after the detonation fracture, placing an acidizing operation tubular column, performing pumping injection acid liquid slug, lifting the acidizing operation tubular column, placing an electric pump production tubular column and performing electric pump liquid drainage and well opening alkalifying neutralization, placing an electric pump production Y tubular column without a Y tubular column, performing pumping injection of acid liquid slug, placing the Y tubular column, performing electric pump liquid drainage and well opening alkalifying neutralization and the like. The method has the advantages that detonation fracture and acidizing effects can be further enhanced, the acid liquid injection capability is enhanced, the acidizing radius is expanded, crack closure is further avoided, and a physical effect is enhanced; a detonation fracture effect can be enhanced, a follow-up acidizing step is selected flexibly, and the operation step is omitted while an operation effect can be guaranteed.

The invention relates to a composite inhibitor of natural gas hydrate. The composite inhibitor is prepared from 0.5 to 2 parts of a kinetic inhibitor, 0 to 15 parts of a thermodynamic inhibitor, 0.5 to 1.5 parts of an anti-agglomeration agent and 81.5 to 99 parts of a matrix. The inhibitor provided by the invention is used in a compounding manner, small in adding amount and good in economical efficiency; temperature and pressure of generating the hydrate can be effectively reduced; in a utilization process, the composite inhibitor is convenient to prepare on site, a pumping speed is repid and precious working time is saved; the inhibitor has relatively low surface tension and rapid backflow of residual liquid after working is finished is convenient to realize; the inhibitor can be matched with an anti-swelling agent and the aim of stabilizing a stratum is realized; the inhibitor can also be matched with quick water, so that the inhibitor has dual effect and does not need to work independently, and a lot of human and material resources can be saved.

The invention belongs to the technical field of foam acid and discloses microfoam acid liquid, constitution of a compound foaming agent of the microfoam acid liquid and a preparation method of the microfoam acid liquid. The microfoam acid liquid contains the following components in percentage by mass (100% in total): 10%-25% of HCl (hydrochloric acid), 0.36% of SDJR-2 (compound foaming agent), 0.24% of SBW-101 (foam stabilizer), 0.2% of FS3802 (thickening agent) and the balance of water, wherein the compound foaming agent SDJR-2 contains 55.56% of an FBM-5-2 foaming agent and 44.44% of an AK-304 foaming agent. The microfoam acid liquid has good properties of foaming, foam stabilization, viscosity maintenance, acid rock reaction retardance, temperature resistance, salt resistance, oil resistance, sand carrying and the like; by observing through an optical microscope, the microstructure and size of the microfoam acid liquid meet the dimensional requirement of microfoams; experimental evaluation shows that the microfoam acid liquid is a novel acid liquid system with excellent performance and has wide application prospects.

The invention provides a coiled tubing and packer combined staged fracturing string and method for a slim hole well. The string comprises a casing pipe, a coiled tubing, a connector, a hydraulic safety release, a hydraulic sandblaster, an upper packer, a sliding sleeve base, a reducing release tie-back barrel, a lower packer, an oil pipe, a plurality of bottom packers, a float collar, a guide screen pipe and an open hole section, the coiled tubing is located in the casing pipe, and the lower end of the coiled tubing is connected with the hydraulic safety release through the connector. The string is lowered to a preset position of a target reservoir, steel balls of the specified specification are pumped to set the packer, the fracturing string is released, packing of an original reservoir and a new reservoir transformation section is achieved, then segment-by-segment transformation is conducted through the fracturing string, after transformation is completed, the fracturing string is pulled out, and a production string is lowered; and after the reservoir is transformed, a wellbore has a full bore, the later wellbore maintenance and treatment difficulty and operation risk are reduced, and later secondary transformation is facilitated.

The invention discloses a production method of a composite preventive salt for salt prevention and blocking removal in a shaft. The composite anti-salt production method comprises the steps of S1, preparing, 2-9 parts of petroleum ether, 4-9 parts of cyclopentanol, 15-22 parts of deionized water, 6-10 parts of an organic acid, 2-9 parts of an inorganic acid, 11-19 parts of an acidizing corrosion inhibitor, 9-16 parts of an anti-swelling agent, 10-13 parts of an activator, 12-16 parts of a shielding agent, 8-11 parts of a regulating agent, 11-15 parts of a complex cleanup additive, and 3-8 parts of a dispersant; S2, grinding the solid particles of the step S1; S3, adding the components of the step S1 into a reactor, and mixing; S4, extracting the reacted material to obtain a composite preventive salt. The composite preventive salt agent helps improve NaCl solubility, the NaCl with improved solubility exists in ion form, and massive salt deposition from a formation is inhibited.

The invention discloses an acid solution system capable of relieving damage of mud to a low-permeability reservoir, which is composed of the following components in percentage by weight: 5-10% of methyl sulfonic acid derivative, 2-5% of isoascorbic acid, 0.5-1% of nonionic surfactant, 0.1-0.5% of corrosion inhibitor, 3-5% of hydrofluoric acid, 3-10% of low-polymer alcohol and the balance of water. The methyl sulfonic acid derivative is aminomethane sulfonate, ethyl methanesulfonate, methyl methanesulfonate, methanesulfonic acid or mixture thereof; the nonionic surfactant is fatty alcohol polyethenoxy ether; the corrosion inhibitor is imidazoline quaternary ammonium salt; and the low-polymer alcohol is methanol, ethanol, isopropanol or mixture thereof. The system can effectively relieve damage of clay minerals in drilling mud to the reservoir, and can restore the permeability of the reservoir, so that oil gas can flow into the shaft from the stratum; and thus, the system has important practical meanings.

The invention provides an oil and gas field exploitation method. The oil and gas field exploitation method comprises the steps that 5-60 parts of self-suspension proppants are added into 100 parts of natural water by volume to form proppant suspension liquid; and then the proppant suspension liquid is conveyed into an underground rock stratum. According to the oil and gas field exploitation method, the natural water is directly used as sand carrying liquid, no thickener is needed, and cost of construction liquid is remarkably reduced. No fracturing liquid needs to be prepared, the number of construction equipment is decreased, the construction process is simplified, the construction time is shortened, and the labor intensity of workers is relieved. The natural water contains no thickener, has little damage to a reservoir and is good in yield increasing effect. Stratum water is not polluted, and the environment is protected.

The invention relates to guar gum fracturing fluid for ultrahigh-temperature reservoirs and a method for preparing the guar gum fracturing fluid. The guar gum fracturing fluid and the method have theadvantages that the seam generating and sand carrying performance of the guar gum fracturing fluid can be guaranteed under the condition that the temperatures of the reservoirs are higher than 140 DEGC, the guar gum fracturing fluid is particularly suitable for fracturing and production increase of high-temperature and ultrahigh-temperature sandstone and carbonate reservoirs and is low in surfaceinterfacial tension, residue content and friction drag, good in stratum viscose mineral stability and high in flow back speed, damage on the reservoirs due to fluid can be effectively reduced, fracturing transformation effects for the high-temperature and ultrahigh-temperature reservoirs and effects of production increase transformation measures can be improved, and the oil and gas recovery ratios of the high-temperature reservoirs can be increased.

The invention belongs to a multi-hydrogen acid system suitable for reservoir plugging-removing acidification and a preparing method thereof. The multi-hydrogen acid system is prepared from, by weight,30-60 parts of hydrochloric acid, 7-12 parts of multi-hydrogen acid, 3-6 parts of a multipurpose additive, 2-4 parts of a shrinking agent, 1-3 parts of an activating agent, 3-8 parts of an initiatingagent, 2-4 parts of a corrosion inhibitor and 3-52 parts of water; the hydrochloric acid is selected from industrial hydrochloric acid with the HCL content of 28% to 31%; the multi-hydrogen acid is selected from one of citric acid, phosphoric acid, oxalic acid and sulfuric acid or a mixture of citric acid, phosphoric acid, oxalic acid and sulfuric acid; the multipurpose additive is a mixture of afluorocarbon surfactant, potassium amine triacetate, potassium chloride and water; the activating agent is selected from one of a demulsifying agent AE1910, a demulsifying agent 1031 and polyethenoxyether or a mixture of a demulsifying agent AE1910, a demulsifying agent 1031 and polyethenoxy ether; the initiating agent is peracetic acid. The multi-hydrogen acid system has the advantages that theacid liquor activity, H+ mild releasing and the buffering effect are achieved, and the multi-hydrogen acid system is suitable for reservoir plugging-removing acidification.

The invention discloses a strong bunching inhibition environment-friendly drilling completion fluid which comprises 80-90 parts of a base liquid and 10-20 parts of a micro emulsion nano preparation, wherein the micro emulsion nano preparation consists of an oxidation gel breaker, a bio-enzyme gel breaker, an acidic gel breaker and a capsule shell; and the oxidation gel breaker and the bio-enzyme gel breaker and the bio-enzyme gel breaker and the acidic gel breaker are isolated by using wrapping membranes. By adopting the drilling completion fluid, a filtering shell can be thoroughly eliminated, the biodegradation flowback effect is good, a hydrocarbon reservoir can be prevented from damage since the fluid is nontoxic, the capacity of an oil and gas well can be increased to the maximum extent, and reservoir stratums can be sufficiently protected.