Downhole pressure test device of ground blowout preventer and test pressure method of downhole pressure test device

Abstract

The invention discloses a downhole pressure test device of a ground blowout preventer and a test pressure method of a downhole pressure test device, and provides a downhole pressure test tool for testing sealing performance of a ground half-seal and the full-seal blowout preventer. An upper joint of the downhole pressure test device is provided with a high-pressure overcurrent hole, an upper trackjoint is provided with a low-pressure overcurrent hole and a reversing track, and a lower track joint is provided with an unlocking track; a piston is installed on the reversing track of the upper track joint and is connected with a stepping locking mechanism which is installed outside a sealing center tube; a locking claw in the stepping locking mechanism is matched with the lower track joint sothat stepping locking movement can be completed; and a reset spring can make the locking claw to reset and make the piston to achieve reversing in the reversing track of the upper track joint. According to the downhole pressure test device of the ground blowout preventer, a plunger pump is utilized to make a liquid column to act on the piston, so that a low-pressure expansion pipe and a high-pressure expansion pipe are pushed to go down with the locking claw, and the purpose of one-way stepping of the low-pressure expansion pipe and the high-pressure expansion pipe is achieved; and when pressure of a pressure test is too high, the stepping locking state of the downhole pressure test device is released, so that damage to the blowout preventer due to excessive high pressure is effectively avoided.

Description

technical field [0001] The present invention relates to a pressure test device of an oil field wellhead blowout preventer, in particular to a downhole pressure test device of a ground blowout preventer and a pressure test method thereof, and provides a method for testing the sealing performance of semi-sealed and full-seal blowout preventers on the ground Downhole pressure testing tool. Background technique [0002] "Well control" refers to the control and management of oil and gas wells, water injection wells and gas injection wells in the whole process of oil and gas exploration and development, including drilling, well logging, mud logging, testing, water injection, gas injection, downhole operations, normal production well management and abandoned wells Disposal and other production links. During the downhole operation, the downhole production string effectively seals the casing annulus and the tubing through devices such as the blowout preventer installed on the casing...

AI Technical Summary

Problems solved by technology

During the high-pressure test, due to factors such as excessive pressure caused by improper operation of the plunger pump, large stress area of ​​the liquid column, and poor quality of tubing hanger threads, well completion string accidents may occur

[0008] The second is that in the daily production of oil wells, due to factors such as well washing, casing addition of paraffin remover and other factors, and production fluid scaling, foreign matter is attached to the inner wall of the casing, so that the rubber sleeve of the cup packer cannot be in contact with the inner wall of the casing. Intense contact, resulting in seal failure

[0009] The third is that the original process relies on the rubber sleeve of the rubber cup packer to expand under pressure to seal the casing annulus. However, during the low-pressure pressure test, the rubber sleeve cannot effectively expand due to the low pressure, and the sealing of the rubber bowl packer Reduced reliability

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