Coal-bed gas well bottom sand removing device

Abstract

The invention relates to coal-bed gas well bottom sand removing device which is mainly composed of an outer cylinder, a supporting frame, a connecting pipe, a screw rotor, a stator, a cardan shaft, a transmission shaft, a tandem bearing, an impeller, a traction head, a breaking cutter, a cone valve, a rubber bushing, a runner connecting pipe, a nozzle and a diffusion tube. The supporting frame is installed between the outer cylinder and the diffusion pipe, the nozzle and the diffusion tube are axially positioned through steps on the connecting pipe, and the rubber bushing is infused on the inner wall of the stator in a pressing mode. The cardan shaft is composed of a movable hinge, a pressure bearing ball, a ball seat, a connection rod and the like. The lower end of the transmission shaft is sequentially connected with the impeller, the breaking cutter and the traction head. The cone valve is installed in a center hole of the transmission shaft and used for adjusting the amount of liquid jetted through the nozzle and the amount of flushing liquid jetted from a circumferential small hole in an impeller shaft. According to the coal-bed gas well bottom sand removing device, a mechanical manner is used for breaking sediment in a bag of a well bottom, a nozzle jetting manner is used for carrying chippings, kerfs and holes cannot be blocked, and the solid-phase sediment at the bottom of a coal-bed gas well can be effectively cleared away.

Description

technical field [0001] The invention relates to a sand removal device at the bottom of a coalbed gas well, in particular to one-time removal of coal powder and sand compacted on the bottom of a well without affecting production layers, and belongs to the field of coalbed methane mechanical equipment. Background technique [0002] To mine coalbed methane by ground drilling, in order to reduce the reservoir pressure, the wellbore usually drills through the production layer when completing the well, and forms a water storage section at the lower end of the production layer, which is called a "pocket" in drilling engineering. However, as the production progresses, solid particles, such as coal slime, sand, proppant for fracturing, etc., will gradually accumulate and deposit in the "pocket" along with the produced water. When the sediment column in the "pocket" Reaching a certain height requires sand removal. Otherwise, the slots or cavities generated by well completion will be ...

AI Technical Summary

Problems solved by technology

Among them, positive flushing, recoil, and positive recoil not only have the problems of sand plugging and weak sand-carrying capacity, but also the pressure on the production layer during sand washing is much greater than the formation pressure, which seriously affects the production layer; although negative pressur...

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