43results about How to "Reduce seepage resistance" patented technology

The invention discloses polymer thermal stability detecting equipment and a polymer thermal stability detecting method. The inlet of a first group of constant speed displacement pump is connected to a first displacing fluid storage device; the outlet of the first group of constant speed displacement pump is connected to the inlet of a first intermediate container group; the outlet of the first intermediate container group is connected to the inlet of a homogeneous sand-filled pipe series group; the outlet of the homogeneous sand-filled pipe series group is connected to the inlet of a second intermediate container group; the outlet of the second intermediate container group is connected to the outlet of a second group of constant speed displacement pump; the inlet of the second group of constant speed displacement pump is connected to a second displacing fluid storage device; the homogeneous sand-filled pipe series group is placed in a temperature constant box; a porous medium short section is mounted between the inlet of the homogeneous sand-filled pipe series group and the outlet of the first intermediate container group. According to the polymer thermal stability detecting equipment and the polymer thermal stability detecting method, the influence on the assessment of polymer stability caused by the lack of combination of a plurality of actual conditions in the prior art is effectively solved, and the dynamic stability detection of a polymer solution is realized.

The invention discloses a multi-stage temporary plugging depth network acid fracturing method, and belongs to the technical field of oil and gas well production increment and improvement. The method comprises the steps that bridge plugging is formed in an artificial fracture through fracture interior temporary plugging material liquid, the artificial fracture is forced to form multiple branch fractures, and main acid is used for etching the fracture; bridge plugging is formed in an artificial fracture opening through fracture opening temporary plugging material liquid, the fracture is forced to be cracked at the new position of a well wall, and interlayer steering is achieved. The multi-stage temporary plugging depth network acid fracturing method has the advantages of being simple in technology, convenient to operate and the like, a complex fracture network is formed in different permeability zones in carbonatite multi-layer, thick-layer or horizontal well long well sections through the principle of combining fluid power self serching and manual control, the oil and gas region communication probability is increased, the oil and gas percolating resistance is reduced, the single-well yield is improved, and a carbonate reservoir is efficiently and economically developed.

The invention discloses a viscosity-reducing and cleanup composition for thickened oil, and a viscosity-reducing and cleanup additive and a preparation method and application thereof, belonging to the technical field of oil exploitation. The viscosity-reducing and cleanup composition comprises, by mass, 0.1 to 2 parts of a fluorocarbon surfactant, 0.5 to 1 part of a hydrocarbon surfactant, 0.25 to 1 part of an auxiliary agent and 0.05 to 0.3 part of the cleanup additive, wherein the fluorocarbon surfactant is one or more selected from a group consisting of FC-01, FC-02, FC-04-1, FC-06, FC-08 and FC-11; the hydrocarbon surfactant is one or more selected from a group consisting of sodium alpha-olefin sulfonate, SYHSY, SDBS and YN; and the cleanup additive is one or more selected from a group consisting of F370, F633 and SH6. The viscosity-reducing and cleanup composition has low surface and interfacial tension, can effectively reduce the dynamic viscosity of thickened oil, improves surface wettability of a rock core and enhances water recovery rate.

The present invention provides a method for determining fluid seepage resistance based on nanotechnology, including step 1, dividing the injection process into three stages according to the injection fluid and injection time of the actual work area, namely the initial injection stage, nano solution injection stage and replacement fluid injection stage; step 2, according to seepage Darcy's law and injection time, determine the total cumulative injection volume of fluid in the reservoir under the condition of different injection time in each stage in each of the three stages; step 3, according to The linear relationship between the total cumulative injection volume of the fluid and the time integral of the injection pressure determines the slope of the injection resistance curve in the three stages; Step 4, respectively determines the resistance coefficient of the fluid in the reservoir during the nano-solution injection stage and the replacement fluid injection stage The residual resistance coefficient of the fluid in the reservoir; step five, according to the relative size relationship between the two resistance coefficients described in step four, evaluate the effect of nanotechnology on reducing resistance and increasing injection. The determination method is accurate, reliable and practical.

The invention discloses a method for controlling oil well bottom water coning by foam. In the method, a mass of foam is injected at the oil-water boundary of an oil well so that a foam plugging area is formed. In the technical technology of controlling oil well bottom water coning by foam in the invention, a mass of foam is injected at the oil-water boundary of the oil well so that a stable foam plugging band is formed. The injected foam has the characteristic of selective water plugging that the foam is broken when meeting oil and is stable when meeting water, so that the foam is comparatively stable at the oil-water boundary and is not easy to be broken and raising of bottom water can be efficiently plugged; and at an oil reservoir, the foam stability becomes weakened due to damage of the oil to the foam, and the foam is easy to be broken, but the output of crude oil in the oil layer is not influenced.

The invention provides a pulse-type fracturing construction process for realizing a liquid self-supporting high-speed channel, which includes the following steps: preparing curable liquid A, low-density carrier liquid B, and high-density top liquid on site while manufacturing cracks Liquid B'; after the fracture creation is completed, liquid A and liquid B are mixed immediately, and the A / B mixed liquid and B' liquid are injected into the formation in a pulsed manner until the fracturing is completed; Mixed liquid B and liquid B' are all displaced into the formation, then the pump is stopped, the well is shut down, and the pressure is suppressed for 40-180 minutes. The mixing method of liquid A and liquid B is as follows: liquid A is sprayed into liquid B, the injection port is located below the liquid surface of liquid B, and liquid A forms centimeter-level liquid particles evenly distributed in liquid B. The invention can reduce the consumption of liquid A, further improve the suspending property and portability of liquid B, and further enhance the diversion capacity; it is also beneficial for cleaning well walls or oil pipes, avoiding wall hanging, and reducing construction risks.

The invention discloses a fracturing technology for shale gas pre-complex fracture network construction. Place fracture-forming pretreatment fluid-create micro-fractures-create main branch fractures-create main fractures-pump displacement fluid, and by pumping pre-fracture-forming pretreatment fluid into the reservoir, expand the complexity of the fracture network of the reservoir and make the reservoir more complex. The fracture network is complicated in advance, which increases the gas production rate and cumulative production. As the pre-fracture pretreatment fluid is pushed into the deep formation, because the shale in the reservoir is hydrophilic, it will affect the associated gas and the interlayer fractures. Adsorbed gas produces displacement, which further improves gas production rate and production; after pumping pre-fracture pretreatment fluid, fracturing in time can prevent the high-pressure liquid barrier area formed by pre-fracture pretreatment fluid from being pumped. It disappears due to permeation and diffusion, saving the fracturing time of each layer of the reservoir; in addition, it can prevent excessive hydration expansion and avoid reservoir pollution.