A Wellhead Casing Gas Pressurized Recovery Device, System, Method and Application

Abstract

The invention belongs to the technical field of wellhead casing gas recovery, and in particular relates to a wellhead casing gas pressurized recovery device, system, method and application. In the present invention, the wellhead casing gas pressurization recovery device composed of polished rod sealer, polished rod, wellhead cross, built-in plunger of pressurization device, screen pipe, variable diameter coupling, work cylinder and sucker rod moves reciprocatingly with the polished rod It works synchronously with the downhole oil well pump, completes the suction and compression process of casing gas in the working cylinder, and enters the oil collection pipeline in the wellhead casing gas pressurized recovery system after pressurization to realize pressurized recovery and complete casing gas recovery. Boost recovery process. The entire pressurization process fully utilizes the operating energy of the pumping unit, and does not affect the work of the pumping unit and the normal production of the oil well. The invention can effectively improve the recovery efficiency of casing gas pressurization, and has the advantages of low manufacturing cost, convenient installation, automatic operation and no manual operation.

Description

technical field [0001] The invention belongs to the technical field of wellhead casing gas recovery, and in particular relates to a wellhead casing gas pressurized recovery device, system, method and application. Background technique [0002] In recent years, various oil fields have strictly implemented the national environmental protection and energy conservation and emission reduction policies, and carried out a lot of work in the comprehensive utilization of associated gas, and achieved good results. The associated gas production capacity of an oilfield is 9.7×108m 3 / a, the utilization rate is about 80%, the ineffective venting of associated gas is about 20%, and the venting volume is about 59×104m 3 / d, resulting in the waste of some natural resources and the pollution of the ecological environment, and there is still a huge potential for the comprehensive utilization of associated gas. [0003] There are mainly five traditional technologies for recovery of wellhead c...

AI Technical Summary

Problems solved by technology

[0004] 1. There is a problem with the recovery technology of constant pressure valve and bleed valve, that is, oil wells with back pressure higher than casing pressure cannot recover casing gas

[0005] 2. The problem with the recovery technology of the interlocking low-pressure pumping cylinder is that the sealing part of the pumping cylinder has high requirements on the environment, and it is hard-connected to the beam of the pumping unit, changing the mechanical structure of the four-linkage operation of the pumping unit, and there are many faults

[0006] 3. The problem with the pressurized recovery technology of the compressor unit is that the equipment and maintenance costs are high, the power consumption is increased, and the applicability of the well site with a small amount of associated gas is not strong

[0007] 4. The problem of using synchronous rotary compressor recovery technology is frequent equipment maintenance during operation, difficulty in low-temperature operation, and weak gas-carrying capacity

[0008] 5. The problem of adopting gas-gathering pipeline network recovery technology in individual well groups is that the cost of pipeline laying is high, and pipelines are easy to freeze and block in winter operation

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