Multifunctional oil testing well completion pipe string and method for well prone to blowout and leakage

Abstract

The invention relates to a multifunctional oil testing well completion pipe string and method for a well prone to blowout and leakage. The well completion pipe string comprises a drill rod (1), an expansion joint (2), an APC circulating valve (3), an anchoring seal (4), a well completion packer (5), an oil pipe (6), a pumping-out type plug (7), a mandrel hanger (8), a double male joint (9), an expansion pipe (10) and an adapter connector (11). The well completion pipe string and method can be used for oil testing well completion work of the well prone to blowout and leakage, it is achieved that the multifunctional oil testing well completion pipe string is rapidly installed in the well prone to blowout and leakage to pack a leakage zone, mass-mud leakage and pollution are avoided in the drilling process of a hydrocarbon reservoir, the number of pulling-out and going-in work times is decreased, the oil testing cycle is shortened, well-control safety risks are reduced, and the oil testing well completion efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of oil exploration and development pilot oil well completion, and more specifically, relates to a multi-functional oil well test well completion string and a well completion method for wells that are prone to blowout and leaky wells. Background technique [0002] For wells that are prone to blowout and leakage and contain hydrogen sulfide, there is no supporting downhole string configuration technology, which cannot fully meet the needs of exploration and development. It is mainly manifested in the occurrence of a large amount of mud leakage during drilling, or when the oil test reservoir is reformed and the well is completed after the test is completed, which brings safety risks to equipment and personnel. For the purpose of accurate data, in the past, the operation method and the configuration technology of the completion string were used after the completion of the conventional test. Due to the difficulty...

AI Technical Summary

Problems solved by technology

[0002] For wells that are prone to blowout and leakage and contain hydrogen sulfide, there is no supporting downhole string configuration technology, which cannot fully meet the needs of exploration and development

It is mainly manifested in the occurrence of a large amount of mud leakage during drilling, or when the oil test reservoir is reformed and the well is completed after the test is completed, which brings safety risks to equipment and personnel. For the purpose of accurate data, in the past, the operation method and the configuration technology of the completion string were used after the completion of the conventional test. Due to the difficulty of well killing in this type of well, there was a greater risk of well control during the operation. Before the pipe string, a large amount of mud is required to kill the well, which will cause serious secondary pollution to the formation. During the tripping process, factors such as poor control of the tripping speed may cause blowout out of control, hydrogen sulfide leakage and other major environmental hazards.

Therefore, such well testing and completion operations still have shortcomings such as long operation period, high cost, and high well control risk, which is not conducive to improving the timeliness of oil testing and completion and reducing the cost of oil testing and completion

Images