CN-121993054-A - Combined liquid drainage system and method for prolonging life cycle of water-producing gas well

CN121993054ACN 121993054 ACN121993054 ACN 121993054ACN-121993054-A

Abstract

The invention belongs to the technical field of oil and gas extraction of oil and gas fields, and particularly provides a combined liquid discharging system and a method for prolonging the life cycle of a water and gas production well, wherein a tower is arranged on a wellhead, a control system is arranged at the bottom of the tower, a steel wire winch lifting device is connected to the upper surface of the tower through an operation platform, a blowout preventer is arranged on a christmas tree, an underground pumping tool and an underground plunger tool are sequentially arranged in the well from top to bottom, the steel wire winch lifting device comprises a steel wire and a power mechanism, one end of the steel wire is connected with the power mechanism, and the other end of the steel wire penetrates through the blowout preventer and the christmas tree and then is connected with the underground pumping tool; the control system is respectively and electrically connected with the hoisting device and the blowout preventer of the steel wire winch. The invention solves the problems that the plunger is difficult to lift and drain liquid in the later period of production and rapid flooding after recovery of the existing water-producing gas well, can achieve better drainage and gas production effects, prolongs the life cycle of the gas well and improves the final recovery ratio of the gas well.

Inventors

Gong Hangfei
YANG YACONG
JIA YOULIANG
TIAN WEI
BAI XIAOHONG
FENG PENGXIN
LI XURI
SONG JIE
TAN BO
WANG YIXUAN

Assignees

中国石油天然气集团有限公司

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

1. A combined drainage system for prolonging life cycle of a water-producing gas well is characterized by comprising a tower (1), an operation platform (2), a control system (3), a wire winch lifting device (4), a blowout preventer (5), an underground swabbing tool (6) and an underground plunger tool (7), wherein the tower (1) is arranged on the well, the control system (3) is arranged at the bottom of the tower (1), the operation platform (2) is arranged on the tower (1), the wire winch lifting device (4) is arranged on the operation platform (2), the blowout preventer (5) is arranged on the christmas tree, the underground swabbing tool (6) and the underground plunger tool (7) are sequentially arranged in the well from top to bottom, the wire winch lifting device (4) comprises a wire (407) and a power mechanism, one end of the wire (407) is connected with the power mechanism, the other end of the wire (407) penetrates through the blowout preventer (5) and the christmas tree and then is connected with the underground swabbing tool (6), and the control system (3) is respectively electrically connected with the wire winch lifting device (4) and the blowout preventer (5).
2. The combined drainage system for prolonging the life cycle of the water and gas producing well according to claim 1, wherein the power mechanism comprises a motor (401) and a wirewinch (403), the power output end of the motor (401) is connected with the wirewinch (403), a wirerope (407) is wound on the wirewinch (403), and the wirewinch (403) is connected with the operating platform (2) below.
3. The combined drainage system for prolonging the life cycle of a water and gas producing well according to claim 2, wherein the wirewinch lifting device (4) further comprises a pulley (405), the pulley (405) is connected with the wirewinch (403), and the other end of the wirewinch (407) is connected with a downhole pumping tool (6) through the pulley (405) and the blowout preventer (5).
4. The combination drain system for extending the life cycle of a water and gas producing well according to claim 3, wherein the wirewinch lifting device (4) further comprises a sensor connected to the pulley (405), and the wirewinch (407) contacts the sensor.
5. The combination drainage system for extended life of a water and gas producing well of claim 4 wherein said sensor comprises a depth sensor (404) and a tension sensor (406), both the depth sensor (404) and the tension sensor (406) contacting a steel wire (407).
6. The combined drainage system for prolonging the life cycle of a water and gas well according to claim 1, wherein the blowout preventer (5) comprises a blowout preventer (501), a blowout preventer (502), a hydraulic control device (503), a blowout preventer (504) and a valve (505), the blowout preventer (501), the blowout preventer (502), the blowout preventer (504) and the christmas tree are sequentially connected from top to bottom, the hydraulic control device (503) is connected with the tower (1), the blowout preventer (501) and the blowout preventer (502) are both connected with the hydraulic control device (503), and the blowout preventer (504) is connected with the christmas tree through the valve (505).
7. The combined drainage system for prolonging the life cycle of a water and gas producing well according to claim 1, wherein the downhole pumping tool (6) comprises an anti-jacking tool (601) and a pumping plunger (602), the anti-jacking tool (601) is connected with the pumping plunger (602) downwards, and a steel wire (407) is connected with the upper end of the anti-jacking tool (601).
8. The combined drainage system for prolonging the life cycle of a water and gas producing well according to claim 1, wherein the downhole plunger tool (7) comprises a single-flow buffer limiter (701), a plunger (702) and a bottom hole limiter (703), and the single-flow buffer limiter (701), the plunger (702) and the bottom hole limiter (703) are sequentially installed from top to bottom.
9. The combination drain system for extending the life cycle of a water and gas producing well of claim 8, wherein the single flow buffer limiter (701) is internally provided with a ball seat and a valve ball, and the valve ball seat falls on the ball seat.
10. A combined liquid discharge method for prolonging life cycle of a water-gas producing well is characterized by comprising the following steps: 1) After the well is opened, the plunger (702) lifts the bottom-hole accumulated liquid to the position above the uniflow buffer limiter (701), and the liquid above the uniflow buffer limiter (701) enables the valve ball to fall back to the ball seat; 2) After the well is closed, the plunger (702) falls to the upper part of the well bottom limiter (703), and the steel wire winch lifting device (4) lowers the underground swabbing tool (6) to the upper part of the single-flow buffer limiter (701) through the steel wire (407); 3) After the opening of the control valve (505) is opened, the steel wire winch lifting device (4) lifts the underground swabbing tool (6) into the lubricator (504) through the steel wire (407) to discharge accumulated liquid above the uniflow buffer limiter (701); 4) The holding valve (505) is kept fully open, the plunger (702) lifts the bottom hole effusion to the position above the uniflow buffer limiter (701), and the steps 3) to 4) are repeated to finish liquid discharge.

Description

Combined liquid drainage system and method for prolonging life cycle of water-producing gas well Technical Field The invention belongs to the technical field of oil and gas extraction in oil and gas fields, and particularly relates to a combined liquid drainage system and method for prolonging life cycle of a water and gas producing well. Background In the whole life cycle of a water-gas producing well, along with the continuation of production, when the productivity of the gas well is reduced below critical carrying flow, the well shaft is easy to generate effusion, so that the yield of the gas well is greatly reduced or even stopped, and liquid drainage measures are needed to be adopted to drain the effusion, thereby prolonging the life cycle of the gas well. The long-day tight gas reservoir is a typical water-producing gas reservoir, at present, more than 15000 liquid-collecting gas wells exist, and the water-draining gas production technology mainly comprises plunger gas lift, speed pipe columns and bubble rows, wherein the bubble rows and the speed pipe columns weaken the liquid-carrying effect along with the reduction of the yield of the gas well, are mainly applied to the gas well with daily yield higher than 5000m 3, have the most wide application range of the plunger gas lift, and can meet the liquid-draining production of the gas well with daily yield higher than 2000m 3. However, because the plunger gas lift relies on the gas well self energy to intermittently drain, when the gas well productivity is further reduced, the situation that the plunger lifts the shaft liquid column to the middle of the oil pipe, but falls back to the bottom of the well due to insufficient energy occurs, and thus the gas well effusion is seriously flooded and stopped repeatedly. For a plunger well with serious effusion, the swabbing is a forced liquid discharge and production process, a swabbing tool is connected through a steel wire and falls below the liquid level of an oil pipe, the power of a ground winch is used for lifting the accumulated liquid of a well barrel to help the plunger gas lift well to recover production, but the plunger is difficult to discharge liquid after a short time due to lower energy of the gas well, the gas well is rapidly flooded and is stopped again, and the purpose of prolonging the life cycle of the gas well cannot be achieved. The Chinese patent document with publication number CN117846550A discloses a gas lift, mechanical pumping combined lift and snubbing operation integrated pipe column, and the pipe column structure comprises a rod type oil pump lifting system, a gas lift system and a snubbing operation device. Through setting up out oil joint and fixed disk seat under the sucker rod, realize that oil flows, through setting up center pole and direction cover, realize the operating condition under the different states, this tubular column has realized preventing that gas from lifting, with gas lift and the effective combination of snubbing serving three, has solved current gas production adaptability poor and high-yield gas well kill-job success rate low problem of preventing. However, the document does not solve the problem that the existing water-producing gas well is difficult to lift and drain the plunger in the later period of production and is flooded rapidly after recovery. Disclosure of Invention The invention provides a combined liquid discharge system and a method for prolonging the life cycle of a water-producing gas well, and aims to solve the problems that a plunger is difficult to lift and discharge liquid in the later period of water-producing gas well production and is flooded rapidly after recovery in the prior art. The invention provides a combined liquid drainage system for prolonging the life cycle of a water-gas producing well, which comprises a tower, an operation platform, a control system, a wire winch lifting device, a blowout preventer, an underground swabbing tool and an underground plunger tool, wherein the tower is arranged on the well, the control system is arranged at the bottom of the tower, the operation platform is arranged on the tower, the wire winch lifting device is arranged on the operation platform, the blowout preventer is arranged on the christmas tree, the underground swabbing tool and the underground plunger tool are sequentially arranged in the well from top to bottom, the wire winch lifting device comprises a wire and a power mechanism, one end of the wire is connected with the power mechanism, the other end of the wire penetrates through the blowout preventer and the christmas tree and then is connected with the underground swabbing tool, and the control system is respectively and electrically connected with the wire winch lifting device and the blowout preventer. Preferably, the power mechanism comprises a motor and a wire winch, the power output end of the motor is connected with the wire winch, the wire winch is wound with a wire, and