Oil pipe capable of bearing coal powder

Abstract

The invention relates to an oil pipe capable of bearing coal powder. The oil pipe is characterized in that the oil pipe comprises an oil pipe body, a liner pipe and coal powder bearing sieve cups, theoil pipe is a flat oil pipe or a thickened oil pipe, the liner pipe is formed by three arc-shaped plates in a welded mode, and the coal powder bearing sieve cups are formed in the mode that conical curved sieves are welded to the inner sides of the arc-shaped plates. The oil pipe is formed in the mode that the liner pipe is inserted into the oil pipe body, and the liner pipe and the oil pipe arewelded at the two end heads, the coal powder bearing sieve cups welded to the liner pipe are distributed in the oil pipe body in a staggered ascending mode at equal distances, and cup openings are upward. Through the oil pipe, the problems of pipeline blockage, pump sticking and pump burying caused by the fact that coal powder in a coal-bed gas drainage gas recovery well settles to be accumulatedat the bottom of the oil pipe is mainly solved.

Description

technical field [0001] The invention relates to a pulverized coal oil pipe, which belongs to the technical field of mining engineering. Background technique [0002] In the field of mining engineering technology, especially the mining of coal bed methane. By discharging the water in the coal seam, the pressure of the coal rock reservoir is reduced, and the coalbed gas adsorbed in the coal rock reservoir is desorbed and released. During the drainage and gas recovery process of coalbed methane wells, the coal seam is crushed and destroyed to produce coal powder. After the produced water carries the coal powder into the wellbore, the drainage pump sucks it in, lifts it to the ground, and discharges it through the wellhead water pipeline. [0003] According to the principle of coalbed methane well drainage and gas recovery, the wellbore structure of a coalbed methane well is usually that the oil pipe and the drainage pump are lowered into the casing, and the drainage pump press...

AI Technical Summary

Problems solved by technology

Among them, for the pulverized coal particles deposited at the bottom of the wellbore, the current removal method mainly includes reverse circulation flushing injected from the annulus of the oil casing, using large-displacement hydraulic impact pulverized coal, the success rate is not high, and the pressure-sensitive effect is likely to damage the production of the coal seam. The gas channel makes it difficult to restore the output to the previous level after the operation, and the frequent cleaning of the pipeline increases the development cost

Another method is to add a sand control screen at the bottom of the well, which can control the particle size of the pulverized coal particles entering the wellbore, so as to avoid problems such as pipeline blockage and pump jamming caused by large pulverized coal particle size, but this method does not It is beneficial to remove the coal powder entering the wellbore in time, and long-term production will cause coal powder deposition at the bottom of the well and bury the coal seam

So far, no relevant research and inventions have been found to prevent and alleviate such problems by improving oil pipes to accept coal powder

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