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Concentric-tube pulverized coal discharging system and method for coal-bed gas well

A coalbed methane well and concentric pipe technology, which is applied in the coalbed methane well concentric pipe pulverized coal discharge system and coalbed methane well concentric pipe pulverized coal discharge system, can solve the problem of low operating efficiency, inability to discharge all the coal powder at the bottom of the well, and a single workover method for coalbed methane wells and other problems, to achieve the effect of improving efficiency, shortening the time of washing coal powder, and shortening the time of operation

Active Publication Date: 2014-06-18
PETROCHINA CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the prior art, the embodiment of the present invention provides a coalbed methane well concentric pipe pulverized coal discharge system and a method for discharging pulverized coal. The shortcomings of all discharges and the characteristics of protecting coalbed methane reservoirs improve the conventional hydraulic pulverized coal flushing method

Method used

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  • Concentric-tube pulverized coal discharging system and method for coal-bed gas well
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  • Concentric-tube pulverized coal discharging system and method for coal-bed gas well

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Embodiment 1

[0029] This embodiment provides a coalbed methane well concentric tube exhaust coal powder system, see figure 1 , figure 2 with image 3 , the system includes: a surface part installed on the surface of the wellhead of the operation well and an underground part installed under the operation well. Wherein, the surface part is the control mechanism of the concentric pipe coal discharge system of the coalbed methane well, and the underground part is the executive mechanism of the coalbed gas well concentric pipe pulverized coal discharge system.

[0030] Specifically, the ground part includes a three-plunger reciprocating pump 1 , a wellhead device 4 of a concentric tube pulverized coal discharge system, a wellhead casing cross 6 and a solid-liquid separation device 15 . Among them, the three-plunger reciprocating pump 1 is used as an increasing pump to change the normal-pressure liquid into a high-pressure liquid and transport it to the underground for coal powder flushing op...

Embodiment 2

[0042] This embodiment provides an installation method of the concentric pipe exhaust coal powder system for coalbed methane wells, see Figure 1 to Figure 4 , the composition and principle of the coalbed methane well concentric pipe exhaust coal discharge system provided in this embodiment are consistent with those described in Embodiment 1. This installation method is aimed at operating wells with different depths, or as the scour depth increases, it is necessary to extend the inner and outer oil pipes , describe the way to extend the inner and outer oil pipes.

[0043] First install the first quick-change joint 23 on the wellhead device 4 of the concentric tube pulverized coal system, install the second quick-change joint 25 on the upper end of the wellhead casing cross 6, and use the high-pressure pipeline to connect the reversing valve 3, the second The quick coupling 25 communicates with the solid-liquid separation device 15 . In this way, during the pulverized coal flu...

Embodiment 3

[0045] This embodiment provides a coalbed methane well concentric tube pulverized coal discharge method, using the coalbed methane well concentric tube pulverized coal discharge system described in Embodiment 1. The specific steps of the method are:

[0046] S1, determine the operating well, install the upper wellhead casing cross 6 at the wellhead of the operating well, and lower the outer oil pipe 10 carrying the concentric tube hydraulic negative pressure jet coal powder flushing device 12 to the expected position of the operating well.

[0047] S2, run the inner oil pipe 18 into the outer oil pipe 10 with the downhole connecting tool 11, and communicate the inner oil pipe 18 with the inner cylinder 121 through the downhole connecting tool 11 under the action of the centralizer.

[0048] S3, install the ground part, that is, install the wellhead device 4 of the concentric pipe pulverized coal discharge system above the wellhead casing cross 6, install the three-plunger recip...

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Abstract

The invention discloses a concentric-tube pulverized coal discharging system for a coal-bed gas well and belongs to the technical field of coal-bed gas well and oil-gas field development. The system comprises a ground portion and a down hole portion. The ground portion comprises a three-plunger reciprocation pump (1), a concentric-tube coal discharging system well head unit (4), a well head casing spool (6) and a solid-liquid separation unit (15). The down hole portion comprises an outer oil tube (10), an inner oil tube (18) and a concentric-tube hydraulic jet pulverized coal flushing unit (12). The ground mechanism delivers high-pressure power liquids to the down hole mechanism which performs pulverized coal flushing. The invention further discloses a coal-bed gas well concentric-tube pulverized coal discharging method using the system. By means of the system and the method, the concentric-tube hydraulic jet pulverized coal flushing unit is arranged, so that pulverized coal of the coal-bed gas well bottom can be flushed thoroughly, the pulverized coal flushing time is greatly shortened, the coal-bed gas repair efficiency is greatly improved, the operation time is shortened, and damage to coal beds of the well bottom can be prevented.

Description

technical field [0001] The invention relates to the technical field of coalbed gas wells and oil and gas field development, in particular to a coalbed gas well concentric tube coal powder discharge system, which is mainly used for removing coal powder, coal coke, coal slime and other solid particles deposited at the bottom of the coalbed gas well. It also relates to a coal bed gas well concentric tube exhaust coal powder method. Background technique [0002] Coalbed methane exploitation is a process of water drainage and depressurization gas recovery. During the pumping and drainage process, due to the impact of drilling, cementing and fracturing on the well wall and surrounding coal seams, coupled with factors such as strong drainage, coal bed methane wells will produce larger particles of coal powder. With the continuation of drainage, the production pressure difference will gradually increase, and the coal seam will be continuously excited, so that solid particles such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00
Inventor 韩军綦耀光熊先钺王旱祥黄勇刘冰刘征王超王伟
Owner PETROCHINA CO LTD
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