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

A recovery device and recovery system technology, applied in earth-moving drilling, wellbore/well components, piston pumps, etc., can solve the problems of inability to recover casing gas, difficulty in low-temperature operation, and increased power consumption, and shorten the search time. The time rate of abnormal oil wells, the effect of reducing the labor intensity of employees and reducing the purchase cost

Active Publication Date: 2022-03-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] according to figure 1 and figure 2 The shown oil well casing gas pressurized recovery device includes a polished rod sealer 5, a polished rod 6, a wellhead cross 26, a built-in plunger 8 of the pressurized device, a screen tube 9, a variable diameter collar 31, a work cylinder 33, The sleeve 34 and the sucker rod 18; the polished rod sealer 5 is connected to the work cylinder 33 through the wellhead spool 26; the polished rod 6 extends into the work cylinder 33 through the polished rod sealer 5, and is placed in the work cylinder 33 The pressurization device inside is connected with a built-in plunger 8, and the screen tube 9 is connected to the lower part of the working cylinder 33; the sleeve 34 is connected to the outside of the working cylinder 33 and the screen tube 9, and the lower port of the sleeve 34 passes through a reducing collar 31 It is connected with the lower port of the screen tube 9, the outer wall of the sleeve 34 is provided with a connecting piece...

Embodiment 2

[0046] according to figure 1 and figure 2 The shown oil well casing gas pressurized recovery device is different from the first embodiment in that the connector provided on the outer wall of the sleeve 34 is the first flange 13, and the lower surface of the first flange 13 is opened. There are grooves.

[0047] In actual use, the connecting piece on the outer side wall of the sleeve 34 adopts the technical scheme of the first flange 13, which can easily connect the oil well casing gas pressurized recovery device and the oil pipe 32 through the flange screw 35, which is low in cost and has Better connection effect. The groove on the lower surface of the first flange 13 is used for placing the sealing steel ring 36 to ensure a good sealing effect.

Embodiment 3

[0049] according to figure 1 The shown oil well casing gas pressurized recovery system includes at least one oil well casing gas pressurized recovery device, and also includes casing gate 1, casing 14, tubing 32, casing gas pipeline 38, casing gas collection Pipeline 29, exhaust pipeline 30 and wellhead oil collection pipeline 19; the oil pipe 32 is connected to the variable diameter collar 31 of the oil well casing gas pressurization recovery device; the casing 14 is sleeved in the oil well casing gas pressurization Outside the recovery device, the upper port of the sleeve pipe 14 is connected to the connector provided on the outer side wall of the sleeve 34; connection; the input end of the casing gas collection line 29 is connected to the casing gas line 38, and the output end of the casing gas collection line 29 is connected to the wellhead cross 26; the input end of the exhaust pipeline 30 is connected to the wellhead cross 26 , the output end of the exhaust pipeline 30 ...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00F04B37/12F04B35/06
CPCE21B43/00F04B37/12F04B35/06
Inventor 侯宁郑刚黎成程颢安会云罗庆梅晏耿成冯建设陈堂锁王凯孙浩王曼石磊吕旭潘昊
Owner PETROCHINA CO LTD
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