Multi-stage lifting pump-blockage-prevention device for coalbed methane well

Abstract

The invention relates to the technical field of coalbed methane exploration and development, in particular to a multi-stage lifting pump-blockage-prevention device for a coalbed methane well. A plurality of pumping improvement devices are connected among a plurality of sucker rods of the device. The pumping improvement devices comprise central rods, the upper portions of the central rods and the lower portions of the central rods are connected with upper limiting blocks and lower limiting blocks respectively, the upper ends of the upper limiting blocks are connected with upper joints, the lower ends of the lower limiting blocks are connected with lower joints, the outer sides of the central rods are sleeved with outer hollow steel sleeves, and the outer hollow steel sleeves can move upwards and downwards along the central rods. The multi-stage lifting pump-blockage-prevention device can prevent coal dust from blocking a pump, greatly prolongs the pump inspection cycle, effectively lowers the operation cost and the coalbed methane draining and collection cost, enables the coalbed methane well to keep stable and continuous draining and collection and facilitates step-down analysis, thereby improving the coalbed methane yield; besides, the multi-stage lifting pump-blockage-prevention device can play a role in blockage relieving on a wellbore immediate vicinity coal seam which is blocked due to serious output of coal dust or coal tar and can make a well of which draining and collection is interrupted due to a large amount of output coal dust of the coal seam resume production.

Description

Technical field: [0001] The invention relates to the technical field of coalbed methane exploration and development, in particular to a multistage lifting anti-jamming pump device for coalbed methane wells. Background technique: [0002] According to the principle of coalbed methane well drainage and gas recovery, the wellbore structure of coalbed methane wells is usually a drainage pump installed in the casing. This design can preliminarily separate the gas and water in the wellbore, and can also reduce the upward return pressure of the fluid in the wellbore. However, in the actual drainage process, the effective stress of the coal seam increases, which leads to the fracture of the coal rock matrix and produces a large amount of coal powder, which causes the coal powder to get stuck in the pump. According to statistics, the coalbed methane well pump inspection operation caused by pulverized coal stuck pump accounts for about 75% of the total pump inspection operation in Fux...

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of the existing coalbed methane well drainage and production, which are easy to get stuck, the workload of pump inspection is large, and the operating cost is high.

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