Under-pressure well repairing working device and method of oil-gas field

Abstract

The invention discloses an under-pressure well repairing working device and method of an oil-gas field. The device comprises a fixed-pressure valve mounted on a getting-in production pipeline; the upper part of a four-way joint is provided with a coupling detector, a lower annular anti-spraying device, a built-in hydraulic lift sub, a three-flashboard anti-spraying device, a sleeve short section and an upper annular anti-spraying device in sequence; the device further comprises a hydraulic control cabinet; the hydraulic control cabinet is connected with the built-in hydraulic lift sub, the three-flashboard anti-spraying device, the upper annular anti-spraying device and the lower annular anti-spraying device respectively; the method comprises the following steps: S1, a sucker rod works; S2, an oil pumping rod, a pump and other tools work. The well repairing working device and method, disclosed by the invention, completely break through a bottleneck of traditional well repairing work; well repairing pressure can be controlled to be lower than getting-in production pressure so that a pressure grade of needed equipment is reduced, the machining and manufacturing cost of the equipment is greatly reduced and the operation cost of an oil-gas well is reduced; furthermore, the difficulty that the well can be repaired only if the well is closed is innovatively overcome.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, and more specifically relates to a pressure workover operation device and method for an oil and gas field. Background technique [0002] In the process of developing oil and gas fields, such as formation pressure changes, downhole accidents, changes in production methods, process technology, adjustment of production formations, etc., it is often necessary to carry out workover operations. The workover operation mainly includes the following steps: 1. The workover equipment pulls out the pipe string in the original well; 2. Runs in the new pipe string, tools and equipment. [0003] For workover operations, traditional workover methods can be classified into two types: [0004] 1. Use kill fluid: drive the kill fluid into the well with a high-pressure pump, wash and kill the well in a circular manner, press the well with the pressure generated by the liquid column to avoid b...

AI Technical Summary

Problems solved by technology

[0010] In order to solve many problems in the traditional workover operation method, such as polluted formation, low safety factor, long time, high energy consumption, well shut-in and maintenance, etc., the present invention provides a pressurized workover operation device and method for oil and gas fields. The well pressure is controlled below the production pressure of the station to realize maintenance without shutting down the well, and the energy generated by formation pressure recovery can be discharged to the production pipeline at the station at any time during the workover process

The invention reduces the pressure level of required equipment, reduces the cost of equipment processing and manufacturing, reduces the difficulty of workover, completely breaks the bottleneck of traditional workover operations, and solves the problem of well shut-in and maintenance

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