Hole dredging device for coal-bed gas well continuous perforation

Abstract

The invention discloses a hole dredging device for coal-bed gas well continuous perforation. The hole dredging device comprises a sucker rod, an oil pipe, a casing, a high-pressure water injection pipe, a rubber sheet spacer, a horizontal spray head, threaded joints, a multi-angle spray head, a positioning nut, a plunger, a traveling valve, a pump cylinder, a fixed valve, a well cementation cementlayer, a positioning bolt, a coal reservoir, a perforated hole, a sliding bearing bush, a water storage bin, a rotary propelling spray head, a fastening bolt and a fastening nut; and according to thedevice, the sliding bearing bush and the oil pipe are connected through the positioning bolt, the positioning nut and the rubber sheet spacer, the water storage bin and the sliding bearing bush are connected, the water storage bin is in threaded connection with the horizontal spray head, the multi-angle spray head and the rotary propelling spray head through the threaded joints, the water storagebin is connected through the fastening bolt and the fastening nut, and the high-pressure water injection pipe is connected with the water storage bin. The multi-angle rotary spray head is adopted, the flushing area is large, the high-pressure flushing effect is good, and interchangeability is high.

Description

[0001] Technical field [0002] The invention relates to an auxiliary dredging equipment assembly for coalbed gas wells, in particular to a dredging device for perforation holes of coalbed gas wells without stopping the well. Background technique [0003] Coalbed methane is one of the important unconventional oil and gas resources exploited in my country at present. The development of coalbed methane can not only provide clean energy for the country and alleviate the shortage of clean energy in our country, but also reduce coal mine gas accidents and reduce greenhouse gas emissions. [0004] The geological conditions of coalbed methane development in my country are extremely complex, coal reservoirs are brittle, and coal powder and coal coke are easily produced. After completion and perforation of coalbed methane wells, migration channels for coalbed methane and free coal powder are formed. After a long-term drainage cycle, Under the action of formation water, chloride ions an...

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Problems solved by technology

[0004] The geological conditions of coalbed methane development in my country are extremely complex, coal reservoirs are brittle, and coal powder and coal coke are easily produced. After completion and perforation of coalbed methane wells, migration channels for coalbed methane and free coal powder are formed. After a long-term drainage cycle, Under the action of formation water, chloride ions and other substances, pulverized coal cements, deposits and stays, and adheres to the perforation hole and the inner wall of the wellbore, causing problems such as blockage of gas production channels, increased friction of rods and pipes, and even no gas production. Affected the continuous and stable drainage of coalbed methane, resulting in major economic losses

At present, in order to solve problems such as blockage of coalbed methane perforation holes, the downhole pipe string is mainly used to lift the downhole pipe string during the shutdown operation stage and then run it into the rubber hose for water injection flushing. The hose flushing angle and coverage area are small, and the flushing effect is poor, which cannot effectively dredge the coalbed methane well. Adhesive aggregates such as coal slime and colloid attached to the inner wall of the perforated hole and the wellbore, and well shutdown operations have seriously affected the gas production of coalbed methane, and even resulted in no gas production, resulting in serious economic losses

[0005] At present, there is no effective device that can realize the dredging of the perforation hole of the non-stop coalbed methane well and the cleaning of the adhesion aggregates on the inner wall of the wellbore, which has caused great obstacles to the stable and continuous drainage of the coalbed methane well and seriously affected the production of coalbed methane. Continuous Drainage and Output Economic Benefits

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