Eccentric type adjustable downhole throttling device for downhole throttling during the development process of gas well natural gas
A throttling device and eccentric technology, which is applied in the direction of wellbore/well valve device, production fluid, wellbore/well parts, etc., can solve the problem of adjusting the size of the orifice downhole, and achieve simple structure and easy wearing parts Less, simple and reliable effect
Inactive Publication Date: 2015-12-30
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to provide an eccentric adjustable downhole throttle device in order to solve the problem of adjusting the size of the orifice downhole during the gas well production process.
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[0013] Such as figure 1 and figure 2 As shown, an eccentric adjustable downhole throttle device of the present invention is composed of an upper end cover 1, a positioning sleeve 2, a positioning pin a3, an upper throttle nozzle 4, a positioning pin b5, a tightening sleeve 6, a spring 7, and a housing 8 , a lower throttle nozzle 9, a column pin 10 and a lower end cover 11; its structural features are: a ring of raised steps is set on the upper part of the outer circle of the positioning sleeve 2, a blind hole is set in the middle of the outer circle, and a lower inner cavity of the positioning sleeve 2 is set Step hole, a through hole is set on the side wall of the step hole, and the orifice of the step hole is set as a thread; the inner cavity of the upper throttle nozzle 4 is set as an eccentric hole, a blind hole is set in the upper part of the outer circle, and a step is set in the middle of the outer circle; the upper throttle The nozzle 4 is put into the lower step hol...
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The invention relates to an eccentric type adjustable downhole throttling device for downhole throttling during the development process of gas well natural gas, which solves the size problem of downhole adjusting throttling holes during the production process of gas wells, wherein an upper throttling nozzle is arranged into a step hole which is arranged on the lower portion of a positioning sleeve, a positioning pin b passes through a through hole which is arranged on the step hole arranged on the lower portion of the positioning sleeve to be inserted into a blind hole of the upper throttling nozzle, a fastened sleeve is connected with a screw thread which is arranged on the lower end of the positioning sleeve, the positioning sleeve, the upper throttling mouth and the fastened sleeve are integrally arranged on the upper portion of a shell inner cavity, a spring is arranged on the step surface which is arranged in the middle of the outer circle of the lower throttling nozzle, the spring and the lower throttling nozzle are integrally arranged on the lower portion of the shell inner cavity, the upper end of a shell and an upper end cover screw thread are connected, and the lower end of the shell and a lower end cover screw thread are connected. The eccentric type adjustable downhole throttling device for downhole throttling during the development process of gas well natural gas is simple in structure, achieve the function to adjust the size of throttling holes under a well, achieves actions by opening and closing a head valve, and is simple and reliable to operate.
Description
technical field [0001] The invention relates to an eccentric adjustable downhole throttling device for downhole throttling in the natural gas exploitation process of a gas well. Background technique [0002] In the process of recovering natural gas from gas wells in oil fields, in order to stabilize production and control pressure, it is necessary to throttle and reduce the pressure of natural gas. In the process of throttling and depressurization of natural gas, the temperature of natural gas will drop rapidly, and hydrates will easily be generated to block the production pipeline. The gas is heated to effectively prevent the generation of hydrates. [0003] However, the currently used downhole choke has only one choke nozzle. As the gas well production time increases, the gas production will change. In order to meet the production allocation requirements, it is necessary to replace the choke nozzle of different sizes. After the replacement of the throttle nozzle is compl...
Claims
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IPC IPC(8): E21B43/12E21B34/06
Inventor 张梁梁政赵勇邓雄叶哲伟蒋发光
Owner SOUTHWEST PETROLEUM UNIV