Injection increasing method for water-injection development of oil reservoir

Abstract

The invention provides an injection increasing method for water-injection development of an oil reservoir. The injection increasing method comprises the following steps that (1) according to the reservoir characteristics of to-be-killed wells, a fracturing technology is optimized; (2) water source water samples and resistance reducing agents nearby a to-be-killed well field are taken for compatibility performance test, and if compatibility performance is good, a mixed solution of anti-swelling agents, the resistance reducing agents and the water source water samples is subjected to a core damage experiment and an anti-swelling performance experiment; (3) according to the well set deficit amount, the injected liquid amount is optimized; (4) the expected construction pressure is calculated,and the liquid inlet mode is selected; (5) on-site construction is conducted, adjacent wells in the same well set are all shut in, and a pressure gauge is mounted; and (6) according to the well set pressure change, the water sample analysis result and / or the core test result, the well shut-in time is determined, and the oil well opening sequence is optimized. According to the injection increasingmethod for water-injection development of the oil reservoir, fracturing and energy-increasing water injection are combined so that the problems that an existing low-permeability oil reservoir is poorin water-injection effect, consequently, formation energy cannot be effectively supplemented in time, and the oil well yield is lowered rapidly can be effectively solved.

Description

technical field [0001] The invention belongs to the field of oil and gas reservoir development, in particular to an oil reservoir augmentation injection method combining fracturing and augmentation water injection. Background technique [0002] In the middle and late stage of water injection development reservoirs, water injection is difficult and the water injection effect is not good. As a result, the formation energy cannot be replenished in a timely and effective manner, the production of oil wells declines rapidly, and the production status of the reservoir is poor. In view of this difficulty, conventional measures such as layered water injection, fracturing, and acidification are mainly used in the current water injection process to increase injection. Among them, the layered water injection process is widely used, which mainly solves the problem of the difference in water absorption capacity caused by the heterogeneity of each layer system, but cannot fundamentally so...

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a water injection method for developing oil reservoirs, to overcome the defects of the prior art, to combine fracturing and energy-increased water injection, and to effectively solve the problem of poor water injection in existing low-permeability reservoirs. As a result, formation energy cannot be replenished in a timely and effective manner, and oil well production declines rapidly

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