Blowout prevention device and method for well repair of pumping well

Abstract

The invention discloses a blowout prevention device and method for well repair of a pumping well and belongs to a method for preventing well blowout in an oil field well repair task. The blowout prevention device is connected between a pump cylinder of an oil well pump and a fixing valve to achieve a blowout prevention effect; when gravities of a piston and a sucker rod of the oil well pump are pressed, the bottom surface of the piston is compressed on a compression head 1; on-off action is realized by using an interaction of oblique tips and oblique surfaces of a movable pressing claw 4 and a rotary pawl 6; due to a special structure on an inner cylinder of the device, an oil inlet manner is changed; a bottom oil inlet manner is changed into a side oil inlet manner; influence on switch-on of the blowout prevention device when underground pressure is excessive is overcome; and a success rate of the blowout prevention device is increased.A seal section between a sliding sleeve and the inner cylinder is not made of the traditional rubber flexible material, minimum clearance fit between metals is employed, and the blowout prevention device further has the characteristic of reusability.The method is simple to apply, flexible to operate, low in cost, high in sealability and sand resistance and energy-saving, protects an environment and can realize a pressure balance task.

Description

technical field [0001] The invention relates to a blowout prevention method for well workover in an oil field, and belongs to a blowout prevention device and method for workover of oil pump wells. Background technique [0002] At present, there are several methods to prevent blowout in oilfield workover operations, such as mud killing method, blowout preventer, valve switch, and pumping well compression type blowout preventer switch. Among these blowout prevention methods, mud pressure The cost of the well is high and there is pollution to the oil reservoir. In other methods, the success rate is low, the sealing material is easy to age, and there is no sand control ability. In particular, the bottom oil inlet method is used, which cannot be reused. These current conditions cannot meet the site requirements, so a new blowout prevention method with high success rate of blowout prevention, low cost, safety and reliability is needed. Contents of the invention [0003] The pu...

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Problems solved by technology

[0002] At present, there are several methods to prevent blowout in oil field workover operations, such as mud killing method, blowout preventer, valve switch, and pumping well compression type blowout preventer switch. Among these blowout prevention methods, mud pressure High well cost and pollution to the reservoir

In other methods, the success rate is low, the sealing material is easy to age, and there is no sand control ability. In particular, the bottom oil inlet method is used, which cannot be reused.

These current conditions cannot meet the site requirements, so a new blowout prevention method with high success rate of blowout prevention, low cost, safety and reliability is needed

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