Separate injection well separate injection technology boundary comprehensive judgment method

Abstract

The invention provides a separate injection well separate injection technology boundary comprehensive judgment method. According to the separate injection well separate injection technology boundary comprehensive judgment method, a ground water injection system-water injection wellbore-water distribution nozzle-injection-production well chamber-oil well wellbore five-node integrated design methodis adopted, the 'interlayer flow difference' is taken as a characteristic variable, selective balanced water injection is taken as a design target, a water nozzle adjustment process boundary and an oil reservoir boundary are comprehensively considered, a comprehensive boundary chart is established, separate injection process selection is guided, a test and regulation process mode is optimized, thetest and regulation period can be effectively prolonged, the labor intensity of personnel is reduced, and the separate injection development effect is improved.

Description

technical field [0001] The invention belongs to the technical field of water injection development in oilfields, and in particular relates to a method for comprehensively judging the technical boundaries of separate injection wells. Background technique [0002] Layered water injection is an enhanced oil recovery method generally recognized by domestic oilfields. It has been widely used in Daqing, Shengli, Changqing and other oilfields, which has boosted the efficient development and sustained and stable production of oilfields. At present, the oilfield layered water injection mainly adopts the bridge-type eccentric and bridge-type concentric split-injection technology. The split-injection pipe string is lowered to realize the split-layer water injection, and the ground testing vehicle is used to run the test instrument to realize the adjustment of the layered flow rate to meet the different requirements. Layer geological requirements. In the test process of the existing te...

AI Technical Summary

Problems solved by technology

In the test process of the existing technology, the experience method is often used for continuous debugging, and the water distributor nozzle of the downhole water distributor is constantly adjusted or replaced to achieve the stratified flow rate to meet the injection requirements. The entire operation process is complicated and difficult to operate. At the same time In the test deployment process, generally only the pressure difference-flow rate-faucet opening classic faucet opening chart is used

Therefore, the pass rate of the process test and adjustment drops rapidly, the reasonable test and adjustment cycle is short, the workload of on-site production operations is heavy, and the cost is high, which restricts the cost reduction and efficiency increase of oilfield water injection.

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