A bottom-hole sand removal device for coalbed methane wells
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A technology for coalbed methane wells and sand cleaning, applied in wellbore/well components, flushing wellbore, earth-moving drilling, etc., which can solve the problems of high equipment pressure, production layer influence, and easy blowout.
Inactive Publication Date: 2016-04-06
SOUTHWEST PETROLEUM UNIV
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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 pressure sand washing It can protect the production layer, but the process is relatively complicated, the equipment pressure is high, and blowout is prone to occur
Mechanical sand removal has little impact on the production layer, but the amount of sand removed each time is limited, and the sand pump needs to be lifted repeatedly
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[0019] The present invention will be further described below in conjunction with the accompanying drawings.
[0020] Such as figure 1 , figure 2 , image 3 , Image 6 , Figure 7 As shown, a coalbed gas well bottom sand removal device of the present invention mainly consists of an outer cylinder 1, a support frame 2, a connecting pipe 3, a screw rotor 4, a stator 5, a transmission shaft 10, a string bearing 12, an impeller 14, and a traction head 15 , Crushing knife 16, cone valve 20, rubber bushing 24, flow channel connecting pipe 25, nozzle 27, diffuser pipe 28, cardan shaft 29. The support frame 2 is installed between the outer cylinder 1 and the diffuser pipe 28, and is used for the radial positioning of the diffuser pipe 28; 28. The connecting pipes 3 are connected by bolts 26; the rubber bushing 24 is pressure-injected on the inner wall of the stator 5; The two ends of the screw rotor 4 and the transmission shaft 10 are respectively connected. The cone valve 20 i...
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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 cleaning. Otherwise, the slots or cavities generated by well completion will be...
Claims
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Application Information
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