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CN-121993121-A - Automatic liquid-discharging type gas well downhole throttle

CN121993121ACN 121993121 ACN121993121 ACN 121993121ACN-121993121-A

Abstract

The invention discloses an automatic liquid discharge type gas well underground throttle which comprises an inner pipe, wherein the upper end of the inner pipe is provided with a liquid inlet end, the lower end of the inner pipe is rotatably connected with an underground end unit, the inside of the underground end unit is connected with a starting unit, the outer cylindrical surface of the inner pipe, which is close to the underground end unit, is clamped with a positioning pipe unit, and the middle section of the outer part of the inner pipe is sleeved with a split type liquid discharge pipe. Solves the problem that the traditional restrictor can not drain liquid when the accumulated liquid in the well shaft of the gas well is serious in the prior art.

Inventors

  • ZHAO BINBIN
  • SONG HANHUA
  • WANG XIANWEN
  • TIAN WEI
  • YANG XUDONG
  • XIAO SHUQIN
  • WEI YAMING
  • JIA YOULIANG
  • LIU SHICHUN
  • LI XURI

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260508
Application Date
20241104

Claims (8)

  1. 1. The automatic liquid draining type gas well underground throttle is characterized by comprising an inner pipe (1), wherein the upper end of the inner pipe (1) is provided with a liquid inlet end (2), the lower end of the inner pipe (1) is rotationally connected with an underground end unit (3), the inside of the underground end unit (3) is connected with a starting unit (5), the outer cylindrical surface, close to the underground end unit (3), of the inner pipe (1) is clamped with a positioning pipe unit (6), and the middle section of the outer part of the inner pipe (1) is sleeved with a split type liquid draining pipe (4).
  2. 2. The automatic liquid draining type downhole choke of gas well according to claim 1, wherein the outer cylindrical surface of the inner tube (1) close to the liquid inlet end (2) is provided with a first annular groove (201), the outer cylindrical surface of the inner tube (1) close to the downhole end unit (3) is provided with a small annular boss (202) and a large annular boss (203), the large annular boss (203) is positioned above the positioning tube unit (6), the upper surface of the large annular boss (203) is uniformly provided with a plurality of first communication holes (206), the inner tube (1) is also provided with a second annular groove (204), the second annular groove (204) is positioned below the large annular boss (203), the lower end surface of the inner tube (1) is provided with an annular cavity (205), one side of the annular cavity (205) close to the downhole end unit (3) is fixedly connected with an annular piece, the annular piece is provided with a plurality of fourth communication holes (208), the annular cavity (205) is communicated with each first communication hole (206), the diameter of the inner tube (205) is smaller than the diameter of the inner tube (207) of the cavity (1), the bottom of the spring cavity (207) is provided with a chevron-shaped seat ring (209).
  3. 3. The automatic liquid draining type downhole choke for gas wells according to claim 2, wherein the downhole end unit (3) is in a hollow step column shape, the downhole end unit (3) comprises a first pipe section (301), a plurality of clamping claws (302) are uniformly arranged on one side of the first pipe section (301), a chamfering table (604) is arranged on one side of the first pipe section (301) close to the clamping claws, each clamping claw (302) is L-shaped in cross section, the clamping claws (302) are clamped on the second annular groove (204), a positioning annular table (303) is arranged in an inner cavity of the first pipe section (301), a limiting annular table (306) is arranged on one side of the inner cavity of the positioning annular table (303) close to the upper surface of the positioning annular table (303), a plurality of second communication holes (304) are uniformly arranged on one circle of the upper surface of the positioning annular table (303), the second communication holes (304) are communicated with corresponding fourth communication holes (208), and a plurality of communication holes (305) are uniformly arranged on one circle of the positioning annular table (303), and the first communication holes (305) are communicated with the corresponding third communication holes (305).
  4. 4. The automatic liquid draining type downhole choke of a gas well according to claim 3, wherein the starting unit (5) comprises a sealing head (501), the sealing head (501) is in a ring column shape, a plurality of slots (507) are uniformly formed in the outer cylindrical surface of the sealing head (501), the sealing head (501) is matched with the positioning ring table (303), a spiral chute is formed in the inner cylindrical surface of the sealing head (501), the automatic liquid draining type downhole choke further comprises a positioning head (505), the positioning head (505) is in a ring column shape, a limiting ring table is arranged on one side surface of the positioning head (505), a plurality of grooves (509) are uniformly formed in the other side surface of the positioning head (505) in a radial direction, a plurality of butt joint holes (508) are uniformly formed in the cylindrical surface of the positioning head (505), the butt joint holes (508) are staggered with the positions of the corresponding grooves (509), positioning blocks are formed in the outer cylindrical surface of the positioning head (505), positioning blocks (510) are connected in a sliding mode, positioning blocks (510) are arranged between the blind holes and the positioning blocks, and the positioning blocks (510) are matched with the spiral chute.
  5. 5. The automatic drainage gas well down-hole choke of claim 4, characterized in that the activation unit (5) further comprises a large spring (506) and a small spring (511), the large spring (506) being provided between the sealing head (501) and the "chevron" seat (209), the small spring (511) being provided between the positioning head (505) and the "chevron" seat (209).
  6. 6. The automatic liquid draining type downhole choke for gas well according to claim 5, wherein the positioning pipe unit (6) comprises a pipe head (601) and an umbrella-shaped pipe section, the pipe head (601) is clamped with the outer surface of the inner pipe (1), the upper surface of the pipe head (601) is contacted with the lower surface of the large circular boss (203), the umbrella-shaped pipe is composed of a plurality of guard plates (602) and a plurality of elastic bodies (603), mounting grooves (605) are formed in two sides of each guard plate (602), each elastic body (603) is clamped in the corresponding mounting groove (605), and the inner side of the umbrella-shaped pipe section is contacted with the chamfering table (604).
  7. 7. The automatic liquid draining type downhole choke of a gas well according to claim 6, wherein the split liquid draining pipe (4) is sleeved on the first annular groove (201), the small annular boss (202) and the large annular boss (203), a plurality of liquid draining holes (404) are uniformly formed in the cylindrical surface of the split liquid draining pipe (4) along the axial direction and the circumferential direction of the cylindrical surface, a plurality of fifth communication holes (403) are formed in the side surface, close to the large annular boss (203), of the split liquid draining pipe (4), the fifth communication holes (403) correspond to the first communication holes (206), and a plurality of baffles (402) are fixedly connected to the surface, close to one side of the large annular boss (203), of the split liquid draining pipe (4).
  8. 8. The automatic liquid discharge type downhole choke for gas well according to claim 7, wherein the baffle plate (402) is composed of two symmetrical guide plates, the cross section of the guide plates is L-shaped, an acute angle is formed between the two guide plates, the bottom of the baffle plate (402) corresponds to a fifth communication hole (403), and liquid discharge holes (404) formed by the included angle of the two guide plates are aligned.

Description

Automatic liquid-discharging type gas well downhole throttle Technical Field The invention relates to the technical field of petroleum and natural gas throttler equipment, in particular to an automatic liquid discharge type downhole throttler for a gas well. Background The phenomenon of wellhead hydrate blockage refers to that in the production process of a gas well, due to the fact that the pressure and the temperature at the wellhead are lower than the conditions that water and certain components in natural gas form hydrates, water and natural gas molecules are combined into solid crystals similar to ice, and the wellhead and a downstream pipeline are blocked, so that the normal production and safety of the gas well are affected. The downhole choke of the gas well is a device for reducing the pressure and the temperature of the downhole of the gas well, can prevent the phenomenon of blocking hydrate at the wellhead, and improves the safety and the production efficiency of the gas well. The traditional downhole throttler mainly relies on the self energy of a gas well to drain, when the gas well is insufficient in energy and the liquid accumulation amount of the liquid in the shaft is large, the gravity of the liquid cannot be overcome by natural gas in the gas well, so that the liquid in the shaft cannot be carried to drain through the throttler. Disclosure of Invention The invention aims to provide an automatic drainage type downhole choke for a gas well, which solves the problem that the traditional choke cannot drain when the accumulated liquid in the well shaft of the gas well is serious in the prior art. The technical scheme includes that the automatic liquid discharge type downhole throttle for the gas well comprises an inner pipe, wherein a liquid inlet end is arranged at the upper end of the inner pipe, a downhole end unit is rotatably connected to the lower end of the inner pipe, a starting unit is connected to the inside of the downhole end unit, a positioning pipe unit is clamped on the outer cylindrical surface of the inner pipe, which is close to the downhole end unit, and a split type liquid discharge pipe is sleeved at the middle section of the outer part of the inner pipe. The technical scheme of the invention is also characterized in that: The inner pipe is close to the first annular groove of having offered on the outer cylinder of feed liquor end, be equipped with little ring boss and big ring boss on the outer cylinder of inner pipe near the lower extreme unit in the pit, big ring boss is located the top of locating tube unit, a plurality of first communication holes have evenly been offered to the round of upper surface of big ring boss, the second annular groove has still been offered on the inner pipe, the second annular groove is located the below of big ring boss, the annular cavity has been offered on the lower terminal surface of inner pipe, the annular cavity is close to one side rigid coupling of lower extreme unit and has had the ring piece, a plurality of fourth intercommunicating pore has been offered on the ring piece, annular cavity and every first communication hole intercommunication, the spring cavity has been offered on the lower terminal surface of inner pipe, the diameter of spring cavity is less than the minimum diameter of annular cavity, the diameter of spring cavity is greater than the internal diameter of inner pipe, the bottom of spring cavity is provided with "people" font seat circle. The underground end unit is in a hollow step column shape and comprises a first pipe section, a plurality of clamping claws are uniformly arranged on one side of the first pipe section, a chamfering platform is arranged on one side of the first pipe section, close to the clamping claws, of each clamping claw, the section of each clamping claw is L-shaped, the clamping claws are clamped on the second annular groove, a positioning ring platform is arranged in an inner cavity of the first pipe section, a limiting ring platform is arranged on one side, close to the upper surface of the positioning ring platform, of the inner cavity of the positioning ring platform, a clamping platform is arranged on the lower surface of the limiting ring platform, a plurality of second communication holes are uniformly formed in the upper surface of the positioning ring platform in a circle, the second communication holes are communicated with corresponding fourth communication holes, a plurality of third communication holes are uniformly formed in a circle of the cylindrical surface of the positioning ring platform, and the second communication holes are communicated with corresponding third communication holes. The starting unit comprises a sealing head which is in a ring column shape, a plurality of slotted holes are uniformly formed in the outer cylindrical surface of the sealing head, the sealing head is matched with a positioning ring table, a spiral chute is formed in the inner cylindrical su