Coal bed gas u-shaped well straight well rapid blowout method and device

By using soluble bridge plug fracturing and vertical well blowout methods, and taking advantage of the elevation difference between the landing point and the docking point, the first section to be fractured is blown out first, which solves the problems of reservoir water sensitivity and solid residue removal, and improves blowout efficiency and wellbore cleaning effect.

CN116537747BActive Publication Date: 2026-07-21HUAINAN MINING IND GRP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAINAN MINING IND GRP
Filing Date
2023-05-22
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In existing technologies, U-shaped wells exhibit reservoir water sensitivity during blowout, have poor ability to carry large volumes of solid residues, and the solid residues are difficult to remove during blowout, leading to reduced reservoir permeability and channel blockage.

Method used

The method employs soluble bridge plug fracturing and vertical well blowout, utilizing the elevation difference between the landing point and the docking point. The first section is fractured and blowout is released first, carrying large particles of residue into the wellbore through the storage pipe. The solid residue inside the storage pipe is then cleaned using retrieval tools.

Benefits of technology

It improved the fracturing fluid flowback rate, reduced the reservoir water sensitivity effect, enhanced the fluid's ability to carry solid residues, and enabled rapid blowout and wellbore cleaning.

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Abstract

The present application provides a kind of coal bed gas U-shaped well straight well fast blowout method and device, the present application is by using soluble bridge plug fracturing and straight well blowout method, realizes first fracturing section first blowout, improves fracturing fluid flowback rate, reduces reservoir water sensitivity effect;The present application utilizes the height difference of landing point and docking point, further improves the ability of flowback fluid to carry solid residues in wellbore;The present application designs a storage tube, and the large particle residues that are difficult to carry to the ground during blowout are deposited in the storage tube, and after blowout is finished, it is fished to the ground by fishing tool, which realizes the purpose of fast blowout and wellbore cleaning.
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Citation Information

Patent Citations

  • A method for efficient extraction of coalbed methane from fractured, low-permeability coal seams using short horizontal well groups

    CN112593910B

  • Method for cleaning sediment in vertical well pocket in process of coalbed methane exploitation

    CN101963052A

  • Horizontal well forced gas drainage method with coal bed gas subjected to staged fracturing

    CN103967472A

  • Tool special for fishing combination operation on tail pipe in coal-bed gas well and operation process by using tool

    CN104141467A