Safe locking device for rotary blowout preventer and locking method

Abstract

The invention discloses a safe locking device for a rotary blowout preventer and a locking method. The safe locking device comprises a safe bolt pin, a bolt pin deck and a self-locking device (5). Thesafe bolt pin comprises a large lug nut (1) and a bolt pin screw (3). The bolt pin deck comprises a first bolt pin deck body (2) and a second bolt pin deck body (4). The first bolt pin deck body (2)is fixed to one side of an opening in the top of a shell clamp of the rotary blowout preventer, the second bolt pin deck body (4) is fixed to the other side of the top of the opening of the shell clamp of the rotary blowout preventer, one end of the bolt pin screw (3) is rotationally fixed to the second bolt pin deck body (4), the other end of the bolt pin screw (3) is connected with the large lugnut (1), the large lug nut (1) can be locked on the first bolt pin deck body (2), the self-locking device (5) is fixed to the top of the shell clamp of the rotary blowout preventer, the self-lockingdevice and the first bolt pin deck body are arranged at the positions of the opening in the same side of the shell clamp of the rotary blowout preventer, and the self-locking device can be clamped into the large lug nut.

Description

technical field [0001] The invention belongs to the technical field of locking of a rotating blowout preventer, and in particular relates to a safety locking device and a locking method for a rotating blowout preventer. Background technique [0002] The existing "three low" oil reservoirs have low initial reservoir pressure, and it is necessary to increase the reservoir capacity through water injection to achieve the purpose of efficient production. Long-term water injection production has led to abnormal pressure in some reservoirs. During drilling and completion, problems such as overflow (water, oil, associated gas) and co-existence of spills and leakages are prone to occur. The risk of well control and operation difficulty increase. The pressure drilling technology adopts the rotary blowout preventer system, which effectively reduces the drilling control risk and operation difficulty. It has become the main drilling technology for oilfield development in high-pressure wa...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a safety locking device and locking method for a rotary blowout preventer, which overcomes 1 in the prior art: the installer must carry tools such as a large adjustable wrench, safety bolts, etc. , the installers work at heights, the station space is limited, the bolt rotation angle is too small, the installation and disassembly procedures are complicated and inefficient; 2: The safety risk of the installers is high, the installers need to work at heights, and the station space is limited, so they can only use one hand 3: There is a risk of safety bolts and operating tools falling into the well, causing complicated underground accidents; 4: The mud is easy to block, and the screw holes of the safety bolts are corroded, which makes loading and unloading difficult, etc.

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