Under the condition of underwater completion technology for deep water oil and gas wells,the annulus trapped pressure of multistage intermediate casing is one of the key factors affecting the integrity of deep water shaft.To effectively control the threat of trapped pressure to shaft safety during hydrocarbon production or testing process,a unidirectional control technology of annulus trapped pressure in deep water shaft was developed.According to the wellbore structure of typical deepwater hydrocarbon wells in the South China Sea as the design basis,a research was performed on the unidirectional release and control technology of trapped space pressure in the production and test process of deepwater shaft.An indoor experiment simulation system of unidirectional control technology was constructed to simulate the influences of shaft thermal fluid on the trapped liquid temperature and pressure.Based on the unidirectional control method of annulus trapped pressure,a set of casing nipples for unidirectional pressure control was developed.Then laboratory simulation experiments were carried out on the principle prototype of casing nipples for unidirectional pressure control.The results show that the unidirectional control method of trap pressure can effectively reduce the casing deformation caused by abnormal increase of trap thermal stress,wellhead sealing failure and other shaft safety accidents.This technology can not only effectively protect the integrity of deep water shaft,but also offer a safety method to control the deepwater trapped pressure.
deep water completionannulus trapped pressureunidirectional controlcasing toolexperimental research
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维普
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