Low-permeability reservoir water slug auxiliary nitrogen huff and puff lingering and sealing method
A nitrogen and oil seepage technology, applied in earthwork drilling, wellbore/well components, and production fluids, etc., can solve the problems of low oil change rate, low recovery degree, and unsatisfactory nitrogen huff and puff effect.
Active Publication Date: 2019-03-29
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 and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.
[0024] Such as figure 1 as shown, figure 1 It is a flow chart of the method for slug-assisted nitrogen huff-puff residence storage of low-permeability reservoir water of the present invention.
[0025] In step 101, the initial reservoir conditions are simulated; the core is connected to the core holder, the air tightness of the device is detected, and the reservoir temperature T is set 0 , Reservoir pressure P 0 , saturate formation water, and test permeability, then saturate oil, measure saturated oil mass m, and calculate initial oil saturation.
[0026] In step 102, simulate natural energy decompression development; gradually reduce the outlet pressure of the core, and the crude oil in the core will be produced under the action of elastic energy....
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The invention provides a low-permeability reservoir water slug auxiliary nitrogen huff and puff lingering and sealing method. The low-permeability reservoir water slug auxiliary nitrogen huff and pufflingering and sealing method comprises the steps of 1, simulating initial reservoir conditions; 2, simulating natural energy decompression development; 3, simulating nitrogen huff and puff development, and developing nitrogen huff and puff after natural energy decompression development is finished; 4, simulating nitrogen and water huff and puff development. The low-permeability reservoir water slug auxiliary nitrogen huff and puff lingering and sealing method has the certain sealing effect on gas channeling produced in the later nitrogen huff and puff period, the formation pressure dependingspeed is lowered, sufficient energy is provided for gas drive and crude oil carrying, and a water slug is added, so that injection pressure is increased, and the gas diffusion capability is improved.
Description
technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for water slug-assisted nitrogen huff-puff retention and storage in low-permeability reservoirs. Background technique [0002] At present, low-permeability reservoirs have become an important position for my country's proven reserves and production capacity construction. They are developed by fracturing and water injection. Due to the influence of poor reservoir physical properties and low degree of water flooding control, the problems of rapid energy decline and insufficient energy increase are prominent. The current calibrated recovery rate is low. Many studies have shown that nitrogen injection is an effective method to improve the development effect of low-permeability reservoirs. It can effectively replenish formation energy and solve problems such as difficult water injection and rapid water cut rise in low-permeability reservoirs. [0003] Ni...
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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