CN-121976773-A - Electric control setting recyclable bridge plug

CN121976773ACN 121976773 ACN121976773 ACN 121976773ACN-121976773-A

Abstract

The invention discloses an electric control setting recyclable bridge plug used in the technical field of oil and gas well completion and well repair, which comprises a connecting module, a setting control module and a setting execution module. The setting control module comprises a motor, a screw rod and a piston assembly, wherein a liquid inlet hole is formed in a central tube, when a bridge plug is put in and does not reach a setting position, the piston does not block the liquid inlet hole, liquid in a well can circulate through the central tube, and the bridge plug cannot form a pressure-blocking state. When the bridge plug reaches a preset setting position, the control unit controls the motor to drive the screw rod to rotate so as to push the piston to axially move to block the liquid inlet hole, so that pressure is build up, and the setting execution module drives the slips to anchor and extrude the rubber cylinder under the action of hydraulic pressure so as to realize sealing setting. After setting is completed, the piston is reset by controlling the motor to reversely drive, the liquid inlet hole is opened again, and the pressure is cancelled, so that setting is relieved, and bridge plug recovery is completed. The invention has reasonable and compact structure, controllable setting process, reduced pipe column lifting and lowering times and improved downhole operation safety.

Inventors

TIAN JIALIN
LI WEIXI
YANG LIN
Mao Lanhui
SHEN JIANPING
Zhu Detou

Assignees

西南石油大学
四川谐铭科技有限公司
浙江慧钻科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260211

Claims (6)

1. The electric control setting bridge plug is characterized by comprising a connecting module, a setting control module and a setting execution module; The connecting module comprises an upper joint (1), a connecting sleeve (2), a releasing pin (3) and a central tube (4), wherein the upper end of the upper joint (1) is used for being connected with a drill string, the lower end of the upper joint is connected with the upper end of the connecting sleeve (2) through threads, and the central tube (4) is connected with a hole (401) at the lower end of the connecting sleeve (2) through the releasing pin (3); The setting control module comprises a steel ball (5), a piston (9), a sealing ring (10), a piston jacket (11), a screw (12), a screw nut (13), a coupler (14), a motor (15), a battery pack (16), a control unit (17), a control base (18) and a retainer ring (19), wherein a ball seat matched with the steel ball (5) is arranged in the central tube (4), the steel ball (5) is placed on the ball seat after being put into the central tube (4) and used for primary axial blocking of the central tube, the steel ball (5) is used for forming auxiliary axial blocking, the auxiliary axial blocking does not participate in opening and closing control of a liquid inlet hole (402) and does not affect the pressure release process realized by the piston (9), the piston (9) is coaxially sleeved outside the central tube (4), the piston (9) is in sealing fit with the piston jacket (11) through the sealing ring (10), the screw nut (13) is fixed on the lower surface of the piston (9) through a bolt, the screw (12) is in threaded fit with the screw nut (13), the motor (15) is in transmission connection with the motor (12) through the coupler (14), the screw nut (12) and the screw nut (13) are uniformly distributed along the axial directions of the screw nut (13) and the screw nut (9), the control unit (17) comprises an MCU and a power management circuit, wherein the control unit (17) and the battery pack (16) are fixed in a control base (18) through bolts, a wire hole is formed in the control base (18) and is used for arranging wires to be connected with a motor (15), the whole setting control module is axially limited on a central tube (4) through a retainer ring (19), a liquid inlet hole (402) is formed in the central tube (4), and when the motor (15) rotates positively, the piston (9) is driven to move upwards along the axial direction through the transmission of the screw (12) and a screw nut (13) until the liquid inlet hole (402) is blocked, so that bridge plug pressure is blocked; The setting execution module comprises an upper pressing pipe (6), a lock ring (8), an upper cone (21), slips (22), a force transmission sleeve (23), a lower cone (24), a spacer ring (26), an anti-bursting ring (27), a rubber cylinder (28) and an anti-collision head (29), wherein the lock ring (8) is connected with a central pipe (4) through a connecting pin (7), a tooth-shaped structure meshed with each other is arranged between the upper pressing pipe (6) and the lock ring (8), the upper pressing pipe (6) moves axially under the action of hydraulic pressure and pushes the upper cone (21) under the pressure-blocking state, the upper cone (21) is connected with a hole (405) of the central pipe (4) and an upper cone hole (2101) through a setting pin A (20), the hydraulic pressure shears the setting pin A (20) after reaching a set value, the slips (22) are driven to expand radially to anchor the sleeve, the hydraulic pressure continuously acts on the force transmission sleeve (23) and is transmitted to the lower cone (24) through the force transmission sleeve (23), the lower rubber cylinder (24) is connected with a hole (406) of the central pipe (4) and the lower cone (21) through a setting pin B (25) and the lower cone hole (24) under the action of hydraulic pressure, the setting pin B (25) is continuously connected with the setting pin (24) through the setting pin B) to cut off the set value, the setting pin (24) continuously until the set value is continuously moves axially, the rubber cylinder (28) radially expands under the limit of the spacing ring (26) and the anti-burst ring (27) and is in sealing contact with the inner wall of the sleeve to realize bridge plug setting, after setting is completed, the bridge plug is released by cutting the releasing pin (3) through lifting the drill string, when recovery is needed, the motor (15) is controlled to reversely drive the piston (9) to reset and open the liquid inlet hole (402), pressure is relieved, bridge plug deblocking recovery is realized, and the anti-burst head (29) is connected with the lower end of the central tube (4) through threads.
2. The electrically controlled setting recyclable bridge plug as set forth in claim 1, wherein said slips (22) are split slips configured to withstand axial loads from above and below and have bi-directional bearing capabilities, and are provided with expansion limit portions (2201) on the inside for limiting the radial expansion travel of the slips to maintain stable engagement with the upper cone (21) and lower cone (24) during expansion to enhance anchoring stability to the casing.
3. The electric control setting recyclable bridge plug according to claim 1, wherein the motor (15) is provided with an encoder, and the control unit (17) obtains the rotation number or rotation angle information of the motor (15) through the encoder, and calculates the axial displacement of the screw rod (12) according to the rotation number or rotation angle information, so that the position of the piston (9) is precisely controlled, and precise blocking or opening of the central pipe liquid inlet hole (402) is realized.
4. An electrically controlled setting retrievable bridge plug according to claim 1, characterised in that the locking ring (8) forms a locking engagement with the upper cone (21) after the anchoring of the slips (22) is completed, for maintaining the setting of the slips after the setting is completed.
5. The electric control setting recyclable bridge plug according to claim 1, wherein an anti-collision head (29) is arranged at the lower end of the bridge plug, and the anti-collision head (29) is connected with the central tube (4) through a screw thread pair and is used for absorbing impact load in the process of descending the bridge plug into a well and preventing the bridge plug from being invalid due to collision.
6. The electrically controlled setting recyclable bridge plug as set forth in claim 1, wherein the upper pressure pipe (6), the upper cone (21), the slips (22), the force transmission sleeve (23), the lower cone (24) and the rubber sleeve (28) are coaxially matched by taking the central pipe (4) as a positioning reference, and are axially displaced in sequence under the action of setting load, so that the anchoring and sealing of the shaft are realized.

Description

Electric control setting recyclable bridge plug Technical Field The invention relates to the technical field of oil and gas well completion and well repair tools, in particular to an electric control setting recyclable bridge plug for underground packing operation, which is suitable for underground operations such as sectional plugging, temporary isolation, testing, subsequent unpacking recovery and the like in a cased well. Background In the well completion and well repair operation process of an oil and gas well, the bridge plug is used as a common underground packing tool and is widely applied to operation scenes such as segmented plugging, temporary isolation, pressure test, subsequent construction and the like. The existing bridge plug usually adopts a mechanical setting or hydraulic setting mode, and drives a cone, slips and a rubber cylinder to complete anchoring and sealing through modes of ball throwing, pressure holding, up-down movement of a pipe column and the like. However, the conventional bridge plug still has certain disadvantages in practical application. On one hand, the setting process has great dependence on hydraulic conditions or tubular column operation, the setting time is difficult to accurately control, especially in complex well conditions or long horizontal wells, the problems of early pressure holding, incorrect setting or insufficient setting are easy to occur, on the other hand, after the setting is completed, the underground pressure release mode is single, the deblocking process is limited, and part of bridge plugs can only release the setting in a destructive mode, so that safe and controllable recovery is difficult to realize. In addition, the existing bridge plug is mainly controlled by adopting a single hydraulic channel for setting, lacks active control capability on the on-off state of underground hydraulic pressure, and has a pressure-holding risk in the process of descending the well, so that the operation safety is affected. Meanwhile, part of bridge plugs are easy to collide or impact underground in the process of being put into the hole to cause structural damage, so that the reliability and the service life of the tool are reduced. Therefore, it is necessary to provide a bridge plug structure with controllable setting process, capable of realizing switching between pressure holding and pressure releasing in the well and recovery capability, so as to improve the safety and reliability of the well operation. Disclosure of Invention The invention aims to provide an electric control setting recyclable bridge plug, which solves the problems that the existing bridge plug setting process is difficult to control, the switching of pressure holding and pressure releasing is inconvenient, and the recycling safety is insufficient, and the control unit controls a motor to drive a piston to move so as to realize the plugging or opening of a central pipe liquid inlet hole, thereby completing the setting and the deblocking recycling of the bridge plug. In order to solve the problems, the invention adopts the technical scheme that the electric control setting recyclable bridge plug is characterized by comprising a connecting module, a setting control module and a setting execution module; The connecting module comprises an upper joint, a connecting sleeve, a releasing pin and a central tube, wherein the upper end of the upper joint is used for being connected with a drill string, the lower end of the upper joint is connected with the upper end of the connecting sleeve through threads, and the central tube is connected with a hole at the lower end of the connecting sleeve through the releasing pin; The setting control module comprises a steel ball, a piston, a sealing ring, a piston jacket, a screw rod nut, a coupler, a motor, a battery pack, a control unit, a control base and a check ring, wherein a ball seat matched with the steel ball is arranged in the central tube, and the steel ball is placed on the ball seat after being put into the central tube and used for primary axial sealing of the central tube. The steel ball is used for forming auxiliary axial blocking, does not participate in opening and closing control of the liquid inlet, and does not influence the pressure release process realized by the piston. The piston is coaxially sleeved on the outer side of the central tube, the piston is in sealing fit with the piston jacket through a sealing ring, the screw nut is fixed on the lower surface of the piston through a bolt, the screw is in threaded fit with the screw nut, the motor is in transmission connection with the screw through a coupler, the motor, the screw nut and the piston are axially and uniformly distributed in two groups along the circumferential direction, and the screw is installed in a screw guide rail arranged on the piston so as to ensure the stability of the axial movement of the piston. The control unit comprises an MCU and a power management circuit, th