Parallel-tube snubbing pulverized coal discharging system for coal-bed gas well

A technology of coalbed methane wells and parallel pipes, which is applied in the direction of wellbore/well components, flushing wellbore, production fluid, etc. It can solve problems affecting the recovery of coalbed methane well productivity, polluted coal seams, and velocity-sensitive effects, so as to avoid velocity-sensitivity and Pressure-sensitive phenomena, ensuring operation safety, and preventing environmental pollution

Inactive Publication Date: 2014-06-18
PETROCHINA CO LTD +2
View PDF7 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: since the coal powder is easily suspended in water, it is difficult to determine whether the coal powder is completely fished out, the efficiency is very low and the solid particles cannot be completely cleared out; in addition During the workover process, the wellhead is completely open. On the one hand, the coalbed methane produced cannot be recycled, resulting in waste of resources, polluting the environment, and unable to guarantee operation safety; The increase of coalbed methane gas production will block the gas

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Parallel-tube snubbing pulverized coal discharging system for coal-bed gas well
  • Parallel-tube snubbing pulverized coal discharging system for coal-bed gas well
  • Parallel-tube snubbing pulverized coal discharging system for coal-bed gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a pulverized coal discharge system for a parallel pipe string of a coalbed methane well, see figure 1 , figure 2 and image 3The system includes: a ground part installed on the surface of the wellhead of the operation well and a downhole part installed under the operation well. Wherein, the ground part is the control mechanism of the coalbed methane well concentric pipe pulverized coal discharge system, and the downhole part is the executive mechanism of the coalbed methane well concentric pipe pulverized coal discharge system.

[0030] Specifically, the ground part includes a solid-liquid separation device 12 , a pump truck 1 , a parallel tube self-sealing device 15 , a parallel tube wellhead device 14 , a blower 2 and a coalbed methane recovery device 3 . Among them, the solid-liquid separation device 12 separates the muddy material mixed with coal powder and high-pressure water discharged from the well, discharges or recovers the coal powd...

Embodiment 2

[0042] This embodiment provides a coal bed methane well parallel pipe snub-free method for discharging pulverized coal, using the coal bed methane well parallel pipe string discharging pulverized coal system described in Embodiment 1, and the specific steps of the method are:

[0043] S1, determine the operation well, install the casing 156 and the top cover 152 in the parallel pipe self-sealing device 15 at the wellhead of the operation well, and connect the first oil pipe 7 and the second oil pipe 18 to the parallel pipe hydraulic jet flushing pulverized coal device 8 respectively Connect the first oil pipe 7 and the second oil pipe 18 with the parallel pipe hydraulic jet flushing pulverized coal device 8 through the top cover 152 and the casing 156 and lower them into the operation well, then lift the top cover 152 and put the two bushings 153 Put it into the casing 156, place the two opening sealing rubbers 154 in the cavity formed by the two bushings 153 respectively, inst...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a parallel-tube snubbing 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 solid-liquid separation unit (12), a pump truck (1), a parallel-tube self-sealing unit (15), a parallel-tube well head unit (14), an air blower (2) and a coal-bed gas recovery unit (3). The down hole portion comprises a first oil tube (7), a second oil tube (18) and a parallel-tube hydraulic jet pulverized coal flushing unit (8). The ground portion is a control mechanism of the system, and the down hole portion is an execution mechanism of the system. The invention further discloses a parallel-tube snubbing pulverized coal discharging method for the coal-bed gas well, which uses the system. By means of the system, continuous pulverized coal discharging can be achieved, the current well repair efficiency is improved, and the stability of pressure of coal-bed gas in the well and the operation safety can be guaranteed during the operation.

Description

technical field [0001] The invention relates to the technical field of coalbed methane well and oil and gas field development, in particular to a coalbed methane well parallel pipe string pulverized coal discharge system, which is mainly used for removing solid particles such as pulverized coal, coal char, coal slime and the like deposited in the coalbed methane well. Background technique [0002] Coalbed methane extraction is a process of drainage and pressure reduction. In the process of pumping and drainage, due to the influence of drilling, cementing and fracturing on the well wall and surrounding coal seams, coupled with factors such as strong drainage, as well as coal seam structure and stratigraphic structural reasons, it is inevitable to have pulverized coal, coal slime and coal. Coke and other solid substances are produced. If the solid substances produced are not brought out of the wellbore by the production fluid, but are deposited in a large amount at the bottom ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E21B21/00E21B43/00
Inventor 熊先钺綦耀光黄勇王旱祥刘征刘冰王伟王超
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap