Anti-blocking throw-in type draining pump of coal-bed gas well

Abstract

The invention relates to an anti-blocking throw-in type draining pump of a coal-bed gas well. The anti-blocking throw-in type draining pump comprises a water extracting and draining part, a piston and a cylinder barrel, wherein the piston is sleeved with the cylinder barrel. The water extracting and draining part is driven by the piston to extract and drain water inside the coal-bed gas well. The water extracting and draining part is fixedly arranged at the bottom of the cylinder barrel. The full-stroke outer circle of the piston is in seal fit with part of the inner circle of the cylinder barrel. The anti-blocking throw-in type draining pump of the coal-bed gas well can effectively prevent the piston from being blocked and can reduce abrasion.

Description

technical field [0001] The invention relates to a drainage pump, in particular to an anti-jamming and throwable drainage pump for coal bed gas wells. Background technique [0002] The production process of coalbed methane wells is to reduce the pressure of the coalbed by pumping the confined water in the coalbed reservoir to achieve the purpose of gas production. The continuous generation of water in the coal seam requires the drainage process to continue without interruption, so that the coalbed methane can be produced continuously, otherwise it will cause damage to the coalbed methane well and affect the gas production. [0003] The piston outer circle length (a short length of the piston) of the existing coalbed methane well is matched with the full stroke inner circle of the cylinder, and the inner circle seal length of the cylinder is longer (stroke length), so it needs to be equipped with a larger gap. The piston reciprocates in the cylinder, and the coal seam water c...

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