Research on Well Killing Technology in Drilling Complex Pressure System Formation
Many significant breakthroughs have been made in regards to deep oil and gas exploration and devel-opment in China,with ultra-deep oil and gas reservoirs becoming important successor resources.However,the drilling of ultra-deep oil and gas reservoirs faces challenges due to the complex pressure systems formations,diffi-culty in killing well after overflow,and the frequent occurrence of lost circulation and overflow.This paper pro-vides a comprehensive review of the adaptability of conventional and unconventional well control methods in deal-ing with overflow in complex pressure system formations.It analyzes the strengths and weaknesses of each method through application cases and shares the technical innovations achieved in well killing during drilling in complex pressure system formations,drawing on practices from well control engineering in the western China.When con-ventional well control methods are applied to well killing in ultra-deep complex pressure system formations,there exist certain limitations.However,unconventional well killing methods have compensated for some of the defi-ciencies of conventional methods in handling overflow in complex pressure system formations.The well killing techniques for complex pressure system formations such as coexistence of lost circulation and overflow,and con-stant volume bodies have been continuously innovated and practiced,and a certain application effect has been achieved,but notes that their theories and techniques require further development.This study summarized the re-search progress of well killing technologies and prospected the future direction of tackling the technical challenges of well killing for the ultra-deep complex pressure system formation,which is of great significance for solving the technical problems of well killing in the ultra-deep complex pressure system formation.
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