Water injection well wellhead test blowout preventer

Abstract

The invention discloses a blowout preventer for wellhead testing of water injection wells, which mainly includes a blowout preventer. A blowout preventer is arranged at the upper end of the blowout preventer, and a sealing plug is connected to the lower end of the blowout preventer. The lifting device is installed or disassembled on the wellhead through the lifting device, and the blowout box is covered with a driving device for lowering and pulling the testing instrument. The device will effectively improve the test success rate of high-pressure water injection wells, and at the same time improve the test accuracy and water distribution qualification rate; solve the problem of high-pressure water injection well testing, and also has high promotion and application value in normal pressure water injection well testing. In a word, it has the following characteristics: 1) The blowout preventer is lifted by ground hydraulic pressure, which eliminates the need for workers to climb up or crane operations; 2) The use of gap leakage and pressure reduction and secondary self-sealing blowout prevention reduces wellhead leakage; 3) The motor drives the steel wire to overcome the underground high pressure and forcefully descends and automatically transports continuously.

Description

technical field [0001] The invention relates to wellhead sealing and blowout prevention technology during testing and deployment of water injection wells in oil fields, in particular to a wellhead testing blowout prevention device for water injection wells. Background technique [0002] At present, the existing wellhead blowout prevention technology for water injection well testing is mainly aimed at water injection wells with normal pressure (water injection pressure ≤ 25MPa). During the layered test of water wells, there were problems such as imperfect supporting technology, specifically the following aspects: the packing mechanism was difficult to seal high pressure, the spray leakage was serious during the process of lifting and lowering the instrument, and it was easy to cause environmental pollution; Difficult to disassemble and heavy on-site operations; the high pressure at the wellhead acts on the sealing packing to compress the steel wire, and at the same time gener...

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Problems solved by technology

[0002] At present, the existing wellhead blowout prevention technology for water injection well testing is mainly aimed at water injection wells with normal pressure (water injection pressure ≤ 25MPa). During the layered test of water wells, there were problems such as imperfect supporting technology, specifically the following aspects: the packing mechanism was difficult to seal high pressure, the spray leakage was serious during the process of lifting and lowering the instrument, and it was easy to cause environmental pollution; Difficult to disassemble and heavy on-site operations; the high pressure at the wellhead acts on the sealing packing to compress the steel wire, and at the same time generates an upward force on the steel wire, which makes it difficult to lift and lower the test instrument. When going down, it needs to overcome the upward force and compression force, and the test instrument relies on weight It is difficult to go down, and workers need to climb up and manually transport; when lifting, the upward force is converted into power, so that the speed of the steel wire rushing out cannot be controlled, and the steel wire cannot be retracted synchronously with the winch and scattered on the ground

[0003] The new type of blowout preventer retrieved from the literature is only equipped with a vent valve on the upper wall of the blowout preventer body. When the wellhead pressure is high, the pressure relief control can be performed, but there are still disadvantages of leakage and pollution of the environment.

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