Start delay packer
By designing a delayed-start packer and utilizing a combination of high-viscosity silicone oil and sealing rings, the problem of hydraulic packers setting due to short-term pressure differentials was solved, enabling smooth cementing operations and avoiding the economic losses of repeatedly running in and out the tubing string.
Patent Information
- Application Number
- CN202423072932.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing hydraulic packers are prone to setting due to short-term pressure differentials during slurry replacement, leading to cementing failure and increasing well completion time and economic costs.
Design a delayed-start packer that uses high-viscosity silicone oil to fill the annular cavity and sets the seal only when the continuous pressure difference reaches a certain value, avoiding setting caused by short-term pressure difference. The packer includes an inner sealing ring, an outer sealing ring, a piston, a hydraulic cylinder, and a silicone oil combination structure.
This ensures that the well is not set due to a brief pressure difference during the slurry replacement process, enabling smooth cementing operations and avoiding repeated tripping of the tubing string, resulting in significant economic benefits.
Smart Images
Figure CN223577886U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model discloses a device for separating strata in oil fields, which is a packer for preventing setting during middle and lower well. BACKGROUND
[0002] After oil field drilling, well completion operation is needed. Well completion operation is to connect a well completion tool at the bottom of a casing and then lower it into a drilled open hole to replace slurry. Replacing slurry is to pump replacement slurry into the casing, and the replacement slurry is returned to the ground from the annulus between the casing and the well wall through the well completion tool at the bottom, so that the slurry used during drilling is replaced. After the replacement slurry is completed, cement slurry is pumped into the annulus between the casing and the wellbore from the casing to solidify (known as well cementing on site). After the cement slurry is pumped into the annulus between the casing and the wellbore, the annulus between the casing bottom and the well wall must be sealed to enable the cement slurry between the casing and the well wall to solidify in a static state. Therefore, the well completion tool must have a packer. The currently used packer is a hydraulic packer that sets by the pressure difference between the inside and outside of the packer. Due to the temporary pressure difference between the inside and outside of the packer that causes the packer to set during replacement, the annulus between the casing bottom and the well wall is sealed, and cement slurry cannot be pumped into the annulus between the casing and the well wall for well cementing. The pipe string must be pulled out and re-lowered for well cementing. After the above problems occur, the well completion time is extended, the well completion cost is increased, and significant economic losses are incurred. SUMMARY
[0003] The utility model discloses a packer that delays setting, so that it does not set when a temporary pressure difference occurs during replacement, ensuring smooth well cementing operation and avoiding repeated pulling and lowering of the well cementing pipe string and economic losses.
[0004] The utility model discloses a purpose is realized like this: including inner tube, pin sleeve, upper pin, lock ring, lock ring seat, hydraulic cylinder, upper sealing ring, starting pin, piston, inner sealing ring, outer sealing ring, middle sealing ring, constant pressure piece, setting sleeve, lower sealing ring, rubber cylinder, lower joint, upper sealing ring is installed in the groove on the boss section of upper portion in the inner tube, there is transmission pressure hole on the inner tube, transmission pressure hole is below upper sealing ring, inner sealing ring is installed in the inner wall groove of piston, outer sealing ring is installed in the outer wall groove of piston, and piston is sleeved on the outer of inner tube, and piston is below the boss section of upper portion in the inner tube, and inner sealing ring seals the clearance between the inner wall of piston and the outer wall of inner tube, and inner sealing ring is below transmission pressure hole, and middle sealing ring is installed in the groove of lower portion in the hydraulic cylinder, and there is vertical transfer hole on the pipe wall of lower portion of hydraulic cylinder, and the upper end of vertical transfer hole communicates with the inside of hydraulic cylinder, and the lower portion of vertical transfer hole installs constant pressure piece, and hydraulic cylinder is sleeved on the outer of inner tube and piston, and the lower inner wall of hydraulic cylinder cooperates with the middle portion of inner tube, and middle sealing ring seals the clearance between the lower inner wall of hydraulic cylinder and inner tube, and the middle inner wall of hydraulic cylinder cooperates with the boss section of upper portion in the inner tube and the outer wall of piston, and the clearance between the middle inner wall of hydraulic cylinder and the boss section of upper portion in the inner tube and the outer wall of piston is sealed by upper sealing ring and outer sealing ring, and the middle inner wall of hydraulic cylinder and the outer wall of inner tube form annular cavity because of the diameter difference, and the annular cavity is below piston, and rubber cylinder and setting sleeve are sleeved on the lower portion of inner tube, and the upper portion of setting sleeve is connected with the lower portion of hydraulic cylinder, and the inside of setting sleeve forms receiving cavity with inner tube, and the lower end of vertical transfer hole communicates with receiving cavity, and the upper portion of lower joint is connected with the lower portion of inner tube, and the connecting portion keeps sealing, and the lower end of rubber cylinder sits on the upper end face of lower joint, and lock ring seat is installed on the upper portion inner hole shoulder of hydraulic cylinder, and lock ring sits on lock ring seat, and pin sleeve is connected on the upper portion of hydraulic cylinder, and pin sleeve and lock ring seat make lock ring not to be able to move in the upper portion of hydraulic cylinder, and pin sleeve is fixed on inner tube by upper pin, and there is outer one-way lock tooth on the outer wall of inner tube, and the outer one-way lock tooth is below lock ring seat, and the inner wall of lock ring has inner one-way lock tooth, and the inner one-way lock tooth of the inner wall of lock ring can be buckled with the outer one-way lock tooth, and after buckling, lock ring can only descend on inner tube and can not ascend, and injection port is arranged on the hydraulic cylinder, and injection port communicates with the annular cavity, and the annular cavity is filled with silicon oil.
[0005] The utility model discloses a purpose is realized like this: the annular cavity is filled with high viscosity silicon oil, and the flowability is very poor, and there is a delay process in transmission pressure, and needs to reach setting sleeve pressure difference to set the sleeve, and when the setting sleeve pressure difference is short -term when replacing the slurry, the utility model also does not set the sleeve, overcomes the problem of prior art, can smoothly complete the cementing operation, can avoid repeatedly starting and lowering the cementing pipe column, and has remarkable economic benefit. DRAWINGS
[0006] Figure 1 It is the structure assembly drawing of the utility model.
[0007] Figure 2 is the structure diagram of the middle part of the utility model DETAILED DESCRIPTION
[0008] The embodiments of the utility model will be described below with reference to the drawings.
[0009] By Figure 1The utility model discloses an embodiment including inner tube 2, pin sleeve 3, upper pin 4, lock ring 5, lock ring seat 6, hydraulic cylinder 7, upper sealing ring 8, starting pin 9, piston 10, inner sealing ring 11, outer sealing ring 12, injection port 14, middle sealing ring 15, constant pressure piece 16, setting sleeve 17, lower sealing ring 18, rubber cylinder 19, lower joint 20, upper sealing ring 8 installs in the groove on the boss section of upper portion in inner tube 2, and there is transmission pressure hole 2-2 on inner tube 2, transmission pressure hole 2-2 is below upper sealing ring 8, inner sealing ring 11 installs in the inner wall groove of piston 10, and outer sealing ring 12 installs in the outer wall groove of piston 10, and piston 10 is sleeved on the outside of inner tube 2, and piston 10 is below the boss section of upper portion in inner tube 2, and inner sealing ring 11 seals the gap between the inner wall of piston 10 and the outer wall of inner tube 2, and inner sealing ring 11 is below transmission pressure hole 2-2, and middle sealing ring 15 installs in the groove in the lower portion of hydraulic cylinder 7, and there is vertical transfer hole 7-2 on the pipe wall of lower portion of hydraulic cylinder 7, and the upper end of vertical transfer hole 7-2 communicates with the inside (annular cavity 7-1) of hydraulic cylinder 7, and the lower portion of vertical transfer hole 7-2 installs constant pressure piece 16, and makes annular cavity 7-1 closed, and hydraulic cylinder 7 is sleeved on the outside of inner tube 2 and piston 10, and the lower inner wall of hydraulic cylinder 7 cooperates with the middle portion of inner tube 2, and middle sealing ring 15 seals the gap between the lower inner wall of hydraulic cylinder 7 and inner tube 2, and the middle inner wall of hydraulic cylinder 7 cooperates with the boss section of upper portion in inner tube 2 and the outer wall of piston 10, and the gap between the middle inner wall of hydraulic cylinder 7 and the boss section of upper portion in inner tube 2 and the outer wall of piston 10 is sealed by upper sealing ring 8 and outer sealing ring 12, and the middle inner wall of hydraulic cylinder 7 and the outer wall of inner tube 2 form annular cavity 7-1 due to the diameter difference, and annular cavity 7-1 is below piston 10, and lower sealing ring 18 installs in the groove in the lower portion of setting sleeve 17, and rubber cylinder 19 and setting sleeve 17 are sleeved on the lower portion of inner tube 2, and lower sealing ring 18 seals the gap between setting sleeve 17 and inner tube 2, and the upper portion of setting sleeve 17 is connected with the lower portion of hydraulic cylinder 7, and the connecting portion keeps sealed, and the inside of setting sleeve 17 and inner tube 2 form receiving cavity 17-1, and the lower end of vertical transfer hole 7-2 communicates with receiving cavity 17-1, and the upper portion of lower joint 20 is connected with the lower portion of inner tube 2, and the connecting portion keeps sealed, and the lower end of rubber cylinder 19 sits on the upper end face of lower joint 20, and lock ring seat 6 installs on the upper portion inner hole shoulder of hydraulic cylinder 7, and lock ring 5 sits on lock ring seat 6, and pin sleeve 3 is connected on the upper portion of hydraulic cylinder 7, and pin sleeve 3 and lock ring seat 6 make lock ring 5 unable to move in the upper portion of hydraulic cylinder 7, and pin sleeve 3 is fixed on inner tube 2 by upper pin 4, and there is one-way lock tooth 2-1 on the outer wall of inner tube 2, and the outer one-way lock tooth 2-1 is below lock ring seat 6, and the inner wall of lock ring 5 has inner one-way lock tooth, and the inner one-way lock tooth of the inner wall of lock ring 5 can be buckled with outer one-way lock tooth 2-1, and after buckling, lock ring 5 can only descend on inner tube 2, and cannot ascend, and injection port 14 is arranged on hydraulic cylinder 7,The injection port 14 is communicated with the annular cavity 7-1, and the silicon oil is filled into the annular cavity 7-1 through the injection port 14.
[0010] The injection port 14 and the exhaust hole 13 are arranged on the hydraulic cylinder 7, so that the silicon oil is filled into the annular cavity 7-1, and the exhaust hole 13 is arranged at the upper end of the annular cavity 7-1. After the silicon oil is filled into the annular cavity 7-1, the exhaust hole 13 and the injection port 14 are closed, so that the silicon oil cannot be leaked.
[0011] The upper adapter 1 is arranged on the inner tube 2, and the lower adapter 20 is connected with the tail pipe.
[0012] The silicon oil filled into the annular cavity 7-1 is high-viscosity silicon oil, and the viscosity is greater than 5x10 4 mPa.s, and the maximum value is 1.5x10 6 mPa.s.
[0013] After the drilling is completed, the well is filled with mud, and the mud needs to be replaced. The utility model and other completion tools are lowered into the design position with the casing, the mud replacement liquid is injected into the casing, and the mud inside and outside the casing is replaced. Then the pipe string is pressed, the pressure is transmitted to the upper end of the piston 10 through the pressure transmission hole 2-2, the piston 10 generates a downward thrust, the starting pin 9 is sheared, the piston 10 is started to descend after the starting pin 9 is sheared, the pressure of the silicon oil in the annular cavity 7-1 is increased, the constant pressure piece 16 is broken, the silicon oil in the annular cavity 7-1 is transferred to the receiving cavity 17-1 through the vertical transfer hole 7-2, and the upper pin 4 is also sheared, the pin sleeve 3, the lock ring 5, the lock ring seat 6, the hydraulic cylinder 7, the setting sleeve 17 and the rubber cylinder 19 are descended, the rubber cylinder 19 is compressed and expanded to seal the well wall, and at the same time, the lock ring 5 is buckled with the outer one-way lock tooth 2-1, the compression and expansion state of the rubber cylinder 19 is fixed, so that the rubber cylinder 19 always seals the well wall.
Claims
1. A delayed-release packer, comprising an inner tube (2), a pin sleeve (3), an upper pin (4), a lock ring (5), a lock ring seat (6), a hydraulic cylinder (7), an upper sealing ring (8), a release pin (9), a piston (10), an inner sealing ring (11), an outer sealing ring (12), a middle sealing ring (15), a constant-pressure plate (16), a setting sleeve (17), a lower sealing ring (18), a rubber sleeve (19), and a lower joint (20), characterized in that: The upper sealing ring (8) is installed in the groove on the upper boss section of the inner tube (2), the inner tube (2) has a pressure transmission hole (2-2) below the upper sealing ring (8), the inner sealing ring (11) is installed in the groove on the inner wall of the piston (10), the outer sealing ring (12) is installed in the groove on the outer wall of the piston (10), the piston (10) is sleeved on the outer wall of the inner tube (2), the piston (10) is below the upper boss section of the inner tube (2), the inner sealing ring (11) seals the gap between the inner wall of the piston (10) and the outer wall of the inner tube (2), the inner sealing ring (11) is below the pressure transmission hole (2-2), the middle sealing ring (15) is installed in the groove on the lower inner wall of the hydraulic cylinder (7), the lower wall of the hydraulic cylinder (7) has a vertical transfer hole (7-2), the upper end of the vertical transfer hole (7-2) communicates with the inner part of the hydraulic cylinder (7), the lower part of the vertical transfer hole (7-2) is provided with a constant pressure piece (16), the hydraulic cylinder (7) is sleeved on the outer wall of the inner tube (2) and the piston (10), the lower inner wall of the hydraulic cylinder (7) cooperates with the middle part of the inner tube (2), the middle sealing ring (15) seals the gap between the lower inner wall of the hydraulic cylinder (7) and the inner tube (2), the middle inner wall of the hydraulic cylinder (7) cooperates with the upper boss section of the inner tube (2) and the outer wall of the piston (10), the gap between the middle inner wall of the hydraulic cylinder (7) and the upper boss section of the inner tube (2) and the outer wall of the piston (10) is sealed by the upper sealing ring (8) and the outer sealing ring (12), the gap between the middle inner wall of the hydraulic cylinder (7) and the outer wall of the inner tube (2) forms an annular cavity (7-1) due to the diameter difference, the annular cavity (7-1) is below the piston (10), the rubber sleeve (19) and the setting sleeve (17) are sleeved on the lower part of the inner tube (2), the upper part of the setting sleeve (17) is connected with the lower part of the hydraulic cylinder (7), the inner part of the setting sleeve (17) and the inner tube (2) form a receiving cavity (17-1), the lower end of the vertical transfer hole (7-2) communicates with the receiving cavity (17-1), the upper part of the lower connector (20) is connected with the lower part of the inner tube (2), the connection is sealed, the lower end of the rubber sleeve (19) is seated on the upper end surface of the lower connector (20), the lock ring seat (6) is installed on the upper inner hole shoulder of the hydraulic cylinder (7), the lock ring (5) is seated on the lock ring seat (6), the pin sleeve (3) is connected to the upper part of the hydraulic cylinder (7), the pin sleeve (3) and the lock ring seat (6) make the lock ring (5) unable to move in the upper part of the hydraulic cylinder (7), the pin sleeve (3) is fixed on the inner tube (2) by the upper pin (4), the outer one-way locking tooth (2-1) is arranged on the outer wall of the inner tube (2) and below the lock ring seat (6), the inner wall of the lock ring (5) has an inner one-way locking tooth, the inner one-way locking tooth of the inner wall of the lock ring (5) can be buckled with the outer one-way locking tooth (2-1), after buckling, the lock ring (5) can only move downward on the inner tube (2) and cannot move upward, the hydraulic cylinder (7) is provided with an injection port (14), the injection port (14) communicates with the annular cavity (7-1),The annular cavity (7-1) is filled with silicone oil.