Water slug assisted nitrogen huff and puff retention storage method in low permeability reservoir
A nitrogen and oil seepage technology, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of low recovery degree, low oil change rate, unsatisfactory nitrogen huff and puff effect, etc., to improve the diffusion capacity , the effect of increasing the injection pressure
Active Publication Date: 2021-06-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0004] However, the field implementation found that with the increase of the throughput cycle, the degree of recovery is getting lower and lower, the oil change rate is low, and the effect of nitrogen stimulation is not ideal
The main reason is that nitrogen gas gradually forms a large continuous channel in the process of huffing and puffing, and the gas channeling phenomenon is serious during the mining process, and nitrogen gas cannot form an effective residence in the formation.
The pure energy-enhancing effect has limited the development of nitrogen huff and puff, so it is necessary to explore a nitrogen composite huff and puff method from the perspective of auxiliary additives to enhance the effect of nitrogen huff and puff
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[0023]In order to make the above and other objects, features, features and advantages of the present invention, the preferred embodiments are taken below, and the drawings are shown in detail.
[0024]Such asfigure 1 Distancefigure 1 A flow chart of a method of assisting nitrogen-fluid-homotive segment plug-in auxiliary nitrogen in the present invention.
[0025]At step 101, the initial reservoir conditions are simulated; the core is brought into the core gripper, the detecting device is air tightness, and set the reservoir Temperature T.0, Reservoir pressure P0Saturated formation water, and test penetration, then saturated oil, metering saturated oil mass M, and calculates the initial oil saturation.
[0026]At step 102, natural energy step-down development; gradually reduce the rocky export pressure, the crude oil in the core is output under the action of elasticity, and when the core pressure drops to a certain pressure P1After, stop the step-down, record the amount of oil production1, Ha...
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The present invention provides a method for water slug-assisted nitrogen huff-puff residence and storage in low-permeability oil reservoirs. The method for low-permeability oil reservoir water slug-assisted nitrogen huff-puff residence and storage includes: step 1, simulating initial reservoir conditions; step 2 , simulating natural energy decompression development; step 3, simulating nitrogen huff and puff development, after the natural energy depressurization development is completed, nitrogen huff and puff; step 4, simulating nitrogen + water huff and puff development. The water slug assisted nitrogen huff and puff retention and storage method in low permeability reservoirs has a certain sealing effect on the gas channeling generated in the later stage of nitrogen huff and puff, slows down the drop in formation pressure, and provides sufficient energy for gas driving and carrying crude oil , by adding a water slug, the injection pressure can be increased to improve the diffusion capacity of the gas.
Description
Technical field[0001]The present invention relates to the field of oil and gas field development technologies, and more particularly to a method of suppressing auxiliary nitrogen throughput in a low permeable oil segment.Background technique[0002]At present, the low-permeability reservoir has become an important position in my country's proven reserves and production capacity construction. It uses fracturing and water injection development, poor storage layer, and low degree of water-drive control. The problem of energy is fast, and the increase in increased energy is prominent. Currently calibrated hue. Many studies have shown that nitrogen is an effective way to improve the development of low-permeable reservoirs, which can effectively supplement the formation energy, solve the problem of low-permeable oil-based water, and the rise in water.[0003]Nitrogen is swallowing does not need a perfect well network, and the single well can be achieved; nitrogen has a good energy effect, can...
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IPC IPC(8): E21B43/16E21B43/22
CPCE21B43/16E21B43/166
Inventor 张丁涌冯庆伟鹿腾万惠平张伟张江李健李兆敏冯虎衣军许新华刘晓冰
Owner CHINA PETROLEUM & CHEM CORP