A method for comprehensively judging the boundary of separate injection technology in separate injection wells

Abstract

The present invention provides a method for comprehensively judging the technical boundaries of separate injection wells. The method for comprehensively judging the technical boundaries of separate injection wells uses five nodes: ground water injection system, water injection shaft, water distribution nozzle, injection-production well, and oil well shaft. The integrated design method takes "interlayer flow difference" as the characteristic variable, takes selective and balanced water injection as the design goal, comprehensively considers the nozzle adjustment process limit and the reservoir limit, establishes a comprehensive limit chart, guides the selection of separate injection processes, and optimizes the measurement Adjustment process mode, the application of this method can effectively extend the measurement and adjustment cycle, reduce the labor intensity of personnel, and improve the effect of dispensing development.

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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