Well backwashing coal crushing device and coal crushing method thereof

By designing a backwash well coal crushing device, which uses a coal crushing pen tip and a hydrocyclone to crush large coal particles in the well shaft, the problem of well shaft blockage in existing technologies has been solved, achieving efficient cleaning and extending the pump inspection cycle.

CN121654355APending Publication Date: 2026-03-13PETROCHINA CO LTD
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Patent Information

Application Number
CN202411271480.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-11
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

In existing technologies, hydraulic cleaning and nitrogen well washing processes are easily blocked by large coal particles when cleaning coalbed methane wellbores, resulting in low construction efficiency, repeated tripping of tubing, and affecting the normal operation of downhole equipment.

Method used

Design a reverse-wash well coal crushing device, including a coal breaking section and a coal crushing section. Large coal particles are initially crushed using a coal breaking pen tip and a hydrocyclone, and further crushed through a hydrocyclone channel and a coal crushing cone. Cleaning is achieved by combining a short oil pipe section and a high-pressure hose.

Benefits of technology

It effectively cleans large-diameter coal particles in the wellbore, improves the cleaning effect of L-shaped horizontal wells, extends the pump inspection cycle, simplifies construction operations, and facilitates on-site promotion.

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Abstract

The invention relates to a backwashing well coal crushing device, and relates to the field of coalbed methane exploitation technology, the backwashing well coal crushing device comprises a coal crushing section located at the bottom end, the top end of the coal crushing section is provided with a coal crushing section, the coal crushing section is relatively communicated with the interior of the coal crushing section, the top end of the coal crushing section is provided with an oil pipe, and the oil pipe is communicated with the interior of the coal crushing section. And the interior of the oil pipe is relatively communicated with the interior of the coal crushing section. The device has the effects of cleaning sediments such as large-particle coal briquettes in a shaft, reducing the influence on underground drainage and mining equipment and prolonging the pump inspection period.
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