Blocking device for drainage gas recovery of horizontal well velocity string

A technology of velocity pipe string drainage and horizontal well, which can be used in earth-moving drilling, wellbore/well components, sealing/packaging, etc. Effect

Pending Publication Date: 2017-05-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to solve the problem of air leakage and shedding caused by the plugger scraping the tubing wall in the inclined well section during the running operation of the velocity string

Method used

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  • Blocking device for drainage gas recovery of horizontal well velocity string
  • Blocking device for drainage gas recovery of horizontal well velocity string

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In order to solve the problem of air leakage and shedding caused by the plug scraping the tubing wall in the inclined well section during the running operation of the velocity string, this embodiment provides a figure 1 with figure 2 The shown plugging device for horizontal well velocity pipe string drainage and gas production includes a cylindrical shell 1, the bottom end of which is threaded to connect the guide head 2, and the shell 1 is provided with a plurality of sieve holes 8, and the inner cavity A plug 3 is provided, and the outer wall of the plug 3 is connected with the inner wall of the housing 1 by a pin 4. The outer wall of the plug 3 is provided with two slots 5, and the two slots 5 are symmetrical about the axial centerline of the plug 3. ;

[0020] Such as figure 1 As shown, the top of the guide head 2 is provided with a pocket 6, the opening of the pocket 6 is upward, the bottom surface is in contact with the top surface of the guide head 2, the pock...

Embodiment 2

[0026] On the basis of Embodiment 1, in order to facilitate machining and installation of various components, the housing 1 is composed of an upper half and a lower half connected by screws.

Embodiment 3

[0028] On the basis of Example 1, such as figure 1 with figure 2 As shown, in order to avoid the occurrence of plugging air leakage and ensure its tightness, the outer wall of the upper half of the housing 1 and the outer wall of the plug 3 are all provided with annular grooves, and O is sleeved in the annular grooves. Type sealing ring 9.

[0029] Three progressively deeper grooves 10 are opened on the upper outer wall of the housing 1 . After the plug is assembled as a whole, the velocity string is rolled to three progressively deeper grooves 10 in sequence by means of a rolling tool. The upper part of the plug adopts the groove design, and the connection between the whole body and the velocity string is adopted to ensure that the connection between the plug and the velocity string is firm and reliable.

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Abstract

The invention provides a blocking device for drainage gas recovery of a horizontal well velocity string. The blocking device for the drainage gas recovery of the horizontal well velocity string is mainly used for the drainage gas recovery of a horizontal well. The blocking device adopts groove type design, adopts rolling type connection with the velocity string overall, is sealed through two seal rings, and then is sealed and firm in overall structure. A plug adopts embedded type design, and is embedded in the body of the blocking device. The lower portion of the body of the blocking device is provided with sieve holes and a pocket, and a self-locking buckle is arranged on the pocket, can lock the plug which is hit down, and then prevents the plug from moving upwards so as to prevent the plug from blocking a production channel. The blocking device for the drainage gas recovery of the horizontal well velocity string solve the problems of gas leakage and dropping, caused due to the fact that a conventional blocking device at an inclined well segment of the horizontal well scratches the wall of an oil pipe, and above all, the velocity string can be enabled to pass through downhole tools of safety joints, hydraulic anchors and the like in a wellbore by using the blocking device, and therefore the velocity string is dropped to a horizontal segment of the gas well, drainage gas recovery effects of the horizontal well velocity string are improved, and furthermore the blocking device for the drainage gas recovery of the horizontal well velocity string has the advantages of being simple in structure, firm in sealing, quick to install and the like.

Description

technical field [0001] The invention belongs to the technical field of gas field exploitation, and in particular relates to a plugging device for drainage and gas recovery of a horizontal well velocity pipe string, and is especially suitable for drainage and gas recovery of a liquid-loaded horizontal well velocity pipe string. Background technique [0002] As the production time of the gas well continues, the production capacity of the gas well gradually decreases. When the flow rate of natural gas in the wellbore is lower than the critical liquid-carrying flow rate, liquid accumulation begins. If the liquid drainage measures are not taken in time, the gas well may be flooded and stop production, seriously affecting the normal production of the gas well. Velocity string drainage gas production technology is based on the theory of wellbore two-phase flow and minimum liquid-carrying flow rate. Smaller-sized coiled tubing is lowered into the crude oil pipe of the gas well as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12
CPCE21B33/1208
Inventor 赵彬彬付钢旦白晓弘刘双全汪雄雄卫亚明李丽樊莲莲杨丹丹
Owner PETROCHINA CO LTD
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