Gas-lift oil production one-round well completion pipe string and process

A completion string and gas lift technology, applied in drill pipe, casing, production fluid, etc., can solve the problems of difficulty in salvaging the packer, failure to lose hands, waste of manpower, etc., to eliminate the risk of well retention, easy to The effect of the movement of the pipe string and the large diameter of the well retention

Active Publication Date: 2018-08-28
山东普瑞思德石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. It is necessary to run the pipe string twice, which wastes manpower and material resources
[0006] 2. There are problems of low-pressure drop and failure to drop successfully in the drop-off structure of the packer
[0007] 3. It is difficult to salvage the packer

Method used

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  • Gas-lift oil production one-round well completion pipe string and process
  • Gas-lift oil production one-round well completion pipe string and process
  • Gas-lift oil production one-round well completion pipe string and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] See attached Figure 1-5 , a completion string for one trip of gas lift oil production, comprising a tubing b, a running tool c, a sealing device d, a packer e, a perforated pipe f and a plug g connected sequentially from top to bottom, specifically as follows:

[0061] (1) Feed tool

[0062] The feeding tool includes an upper joint 1, a pin 2, a drop pin 3, a suspension pin 4, a lock sleeve 5, a first piston 6, a first ball seat 7, a support ring 8, a lower joint 10 and an inner joint 11; The upper joint 1 , the locking sleeve 5 and the lower connecting head 10 are sequentially connected from top to bottom to form the outer pipe part, and the first ball seat 7 and the inner connecting head 11 are connected up and down to form the inner pipe part.

[0063] The outer pipe part is specifically: the upper end of the upper joint 1 is connected with the oil pipe b through threads, the outer surface of the lower end of the upper joint 1 is provided with a boss, the inner sur...

Embodiment 2

[0075] See attached Figure 1-5 , the completion process of the gas-lift oil recovery one trip completion string in embodiment 1, comprises the steps:

[0076] 1) Lower pipe string

[0077] Bottom-up connection: plug g + perforated pipe f + packer e + sealing device d + feeding tool c + tubing b, slowly descend to the design depth.

[0078] 2) Packer setting

[0079] Pump liquid into the annulus between casing a and tubing b, through the annulus between feeding tool c, sealing device d, packer e and casing a respectively, through the holes in perforated pipe f Inside it, pass through the packer e, the sealing device d, and the feeding tool c to the inner cavity of the casing b and return until the returned liquid is clean and free of oil, put in the steel ball 41, and wait for the steel ball to fall to the second ball seat 43 Up; pump liquid into the tubing b with a small displacement, the liquid pressure goes down to the sealing device d through the feeding tool c, and conti...

Embodiment 3

[0089] A well completion process for one completion string of gas lift production, the process steps are basically the same as in Example 2, when step 4) of the well completion process fails to be successfully carried out, step 5) is automatically carried out due to abnormal pressure, that is, The second ball seat 43 and the steel ball 41 have been knocked off while the feeding tool has not been lost; in this case, the second ball can be thrown through the oil pipe b, and the ball falls on the first ball seat 7 of the feeding tool. Then carry out the operation of step 4) of the completion process, that is, perform the second drop; the above-mentioned second ball throwing and then throwing can ensure the successful completion of the throwing process.

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PUM

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Abstract

The invention discloses a gas-lift oil production one-round well completion pipe string and process. The well completion pipe string comprises an oil pipe, a feeding tool, a sealing device d, a packere, a punching pipe f and a plug g. The well completion process includes following steps: (1), lowering the pipe string; (2), setting the packer; (3), verifying sealing of the packer: verifying whether setting of the packer is successful or not; (4), releasing the feeding tool; (5), beating away a ball seat of the packer; (6), performing gas-lift production. According to the status quo of oilfieldgas-lift oil production technology, in order to solve the problems that two pipe strings needed to be lowered in conventional gas-lift oil production processes, packer releasing structure is in low-pressure releasing and fails in releasing and packers are difficult to salve, the pipe string is developed to complete pipe string lowering, packer setting, packer sealing verification, feeding tool releasing, packer ball seat beating-away and lift technology. The process is safe and reliable in releasing structure, can realize releasing after second-time ball throwing and ensures the releasing process to be completed successfully; V-shaped packing seal is adopted, so that sealing effect is good, and easiness for the pipe string to move is realized; letting-in through diameter is large, and smooth lowering of a tester can be realized; the pipe string is suitable for gas-lift oil production and gas-lift drainage gas production.

Description

technical field [0001] The invention relates to the technical field of oil production equipment, in particular to a gas-lift oil production one-trip well completion string and a process. Background technique [0002] The principle of gas lift oil recovery is to rely on the high-pressure gas injected from the surface into the well to mix with the fluid produced in the oil layer in the wellbore, and use the expansion of the gas to reduce the density of the mixed liquid in the wellbore, and lift the crude oil flowing into the well to the surface. Way. [0003] In the exploitation of oil and gas fields, the oil is heavy, and it will cause a relatively large pressure in the wellbore of thousands of meters or even thousands of meters, so that the oil in the formation cannot flow to the ground. If the gas can be artificially pressed into the wellbore so that the liquid in the wellbore becomes lighter after being mixed with gas, the crude oil can be easily sprayed to the ground. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00E21B43/12E21B33/129E21B34/14
CPCE21B17/00E21B33/129E21B34/14E21B43/122E21B2200/04Y02E10/10
Inventor 王玉婷
Owner 山东普瑞思德石油技术有限公司
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