Start delay packer

Abstract

An upper sealing ring is installed on the middle upper portion of an inner pipe, an inner sealing ring and an outer sealing ring are installed on a piston, the inner pipe is sleeved with the piston, a middle sealing ring is installed in a groove in the lower inner portion of a hydraulic cylinder, a vertical transfer hole is formed in the pipe wall of the lower portion of the hydraulic cylinder, and a constant pressure piece is installed on the lower portion of the vertical transfer hole. The inner pipe and the piston are sleeved with the hydraulic cylinder, an annular cavity is formed between the inner wall of the middle of the hydraulic cylinder and the outer wall of the inner pipe due to the diameter difference, the lower portion of the inner pipe is sleeved with the rubber barrel and the setting sleeve, the upper portion of the setting sleeve is connected with the lower portion of the hydraulic cylinder, and a receiving cavity is formed between the interior of the setting sleeve and the inner pipe. The locking ring seat is installed on an inner hole circular bead on the upper portion of the hydraulic cylinder, the locking ring is arranged on the locking ring seat, the pin sleeve is connected to the upper portion of the hydraulic cylinder and fixed to the inner pipe through the upper pin, the hydraulic cylinder is provided with an injection port, the injection port is communicated with the annular cavity, and the annular cavity is filled with silicone oil.

Description

Technical Field

[0001] The invention relates to a device for separating strata in an oil field, which is a packer for preventing the packer from being set during the process of descending into a well, and is specifically a delayed start packer. Background Art

[0002] After drilling in an oil field, completion operations must be performed. Completion operations involve connecting the completion tool at the bottom of the casing to the drilled open hole to replace the mud. Mud replacement is to inject a replacement fluid into the casing. After the replacement fluid passes through the completion tool at the bottom, it returns to the ground from the annulus between the casing and the wellbore, so that the mud used for drilling in the well is replaced. After the replacement of mud is completed, cement slurry is injected from the casing into the annulus between the casing and the wellbore for consolidation (called cementing on site). After the cement slurry is injected into the annulus between the casing and the wellbore, the annulus between the bottom of the casing and the wellbore must be closed so that the cement slurry between the casing and the wellbore can be solidified in a static state to complete the cementing. Therefore, there must be a packer in the completion tool. The current packer is a hydraulic packer, which is set by the pressure difference between the inside and outside of the packer. Because there is sometimes a short pressure difference between the inside and outside of the slurry replacement packer that causes the packer to be set, the packer is set during the slurry replacement. When the packer is set and sealed during the slurry replacement, the annulus between the bottom of the casing and the well wall is closed, and cement slurry cannot be pumped into the annulus between the casing and the well wall for cementing. The string needs to be pulled out and re-inserted for cementing. When the above problems occur, the completion time is extended on the one hand, and the completion cost is increased on the other hand, resulting in significant economic losses. Summary of the invention

[0003] The purpose of the present invention is to provide a delayed start packer so that the packer will not be set when a short pressure difference occurs during the slurry replacement process, thereby ensuring smooth completion of cementing operations, avoiding repeated tripping of cementing pipes, and avoiding economic losses.

[0004] The purpose of the present invention is achieved in this way: it includes an inner tube, a pin sleeve, an upper pin, a locking ring, a locking ring seat, a hydraulic cylinder, an upper sealing ring, a starting pin, a piston, an inner sealing ring, an outer sealing ring, a middle sealing ring, a constant pressure plate, a sealing sleeve, a lower sealing ring, a rubber cylinder, and a lower joint. The upper sealing ring is installed in the groove on the boss section in the middle and upper part of the inner tube. The inner tube is provided with a pressure transmission hole, and the pressure transmission hole is located below the upper sealing ring. The inner sealing ring is installed in the inner wall groove of the piston, and the outer sealing ring is installed in the outer wall groove of the piston. The piston is sleeved outside the inner tube, and the piston is located below the boss section in the middle and upper part of the inner tube. The inner sealing ring The ring seals the gap between the inner wall of the piston and the outer wall of the inner tube. The inner sealing ring is under the pressure transmission hole. The middle sealing ring is installed in the groove inside the lower part of the hydraulic cylinder. There is a vertical transfer hole on the tube wall of the lower part of the hydraulic cylinder. The upper end of the vertical transfer hole is communicated with the inside of the hydraulic cylinder. A fixed pressure plate is installed at the lower part of the vertical transfer hole. The hydraulic cylinder is sleeved on the inner tube and the outside of the piston. The lower inner wall of the hydraulic cylinder cooperates with the middle part of the inner tube. The middle sealing ring seals the gap between the lower inner wall of the hydraulic cylinder and the inner tube. The middle inner wall of the hydraulic cylinder cooperates with the boss section in the middle and upper part of the inner tube and the outer wall of the piston. The hydraulic cylinder The gap between the middle inner wall and the boss section in the middle and upper part of the inner tube and the outer wall of the piston is sealed by the upper sealing ring and the outer sealing ring. An annular cavity is formed between the middle inner wall of the hydraulic cylinder and the outer wall of the inner tube due to the diameter difference. The annular cavity is under the piston. The rubber cylinder and the sealing sleeve are sleeved on the lower part of the inner tube. The upper part of the sealing sleeve is connected to the lower part of the hydraulic cylinder. A receiving cavity is formed between the interior of the sealing sleeve and the inner tube. The lower end of the vertical transfer hole is connected to the receiving cavity. The upper part of the lower joint is connected to the lower part of the inner tube. The connection is kept sealed. The lower end of the rubber cylinder sits on the upper end surface of the lower joint. The lock ring seat is installed It is installed on the upper inner hole shoulder of the hydraulic cylinder, the locking ring sits on the locking ring seat, the pin sleeve is connected to the upper part of the hydraulic cylinder, the pin sleeve and the locking ring seat prevent the locking ring from moving in the upper part of the hydraulic cylinder, the pin sleeve is fixed to the inner tube by the upper pin, the outer wall of the inner tube is provided with an outer one-way locking tooth, the outer one-way locking tooth is located under the locking ring seat, the inner wall of the locking ring is provided with an inner one-way locking tooth, the inner one-way locking tooth on the inner wall of the locking ring can be buckled with the outer one-way locking tooth, after buckling, the locking ring can only go down on the inner tube but not go up, an injection port is arranged on the hydraulic cylinder, the injection port is communicated with the annular cavity, and the annular cavity is filled with silicone oil.

[0005] The beneficial effects of the present invention are as follows: the annular cavity is filled with high-viscosity silicone oil, which has very poor fluidity and a delayed process for pressure transmission. The sealing pressure difference needs to be continuously reached before the sealing is performed. If the sealing pressure difference briefly appears during slurry replacement, the present invention will not seal. The problems existing in the prior art are overcome, cementing operations can be completed smoothly, and repeated tripping of cementing pipes can be avoided, which has significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural assembly diagram of the present invention.

[0007] Figure 2 It is the structural diagram of the middle part of the present invention DETAILED DESCRIPTION

[0008] The embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0009] Depend on Figure 1It can be known that the embodiment of the present invention includes an inner tube 2, a pin sleeve 3, an upper pin 4, a locking ring 5, a locking ring seat 6, a hydraulic cylinder 7, an upper sealing ring 8, a starting pin 9, a piston 10, an inner sealing ring 11, an outer sealing ring 12, an injection port 14, a middle sealing ring 15, a fixed pressure plate 16, a seat sleeve 17, a lower sealing ring 18, a rubber cylinder 19, and a lower joint 20. The upper sealing ring 8 is installed in the groove on the boss section in the middle and upper part of the inner tube 2. The inner tube 2 has a pressure transmission hole 2-2, and the pressure transmission hole 2-2 is located under the upper sealing ring 8. The inner sealing ring 11 is installed in the inner wall groove of the piston 10, and the outer sealing ring 12 is installed in the outer wall groove of the piston 10. The piston 10 is sleeved outside the inner tube 2, and the piston 10 is located under the boss section in the middle and upper part of the inner tube 2. The inner sealing ring 11 seals the piston The inner wall of the hydraulic cylinder 7 and the outer wall of the inner tube 2 are connected to each other, and the inner sealing ring 11 is located below the pressure transmission hole 2-2. The middle sealing ring 15 is installed in the groove inside the lower part of the hydraulic cylinder 7. There is a vertical transfer hole 7-2 on the tube wall of the lower part of the hydraulic cylinder 7. The upper end of the vertical transfer hole 7-2 is communicated with the interior of the hydraulic cylinder 7 (the annular cavity 7-1). A fixed pressure plate 16 is installed at the lower part of the vertical transfer hole 7-2 to close the annular cavity 7-1. The hydraulic cylinder 7 is sleeved on the inner tube 2 and the outside of 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 boss section in the middle and upper part of the inner tube 2 and the outer wall of the piston 10. The middle inner wall of the hydraulic cylinder 7 The gap between the inner wall of the hydraulic cylinder 7 and the boss section in the upper and middle part 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 inner wall of the middle part of the hydraulic cylinder 7 and the outer wall of the inner tube 2 form an annular cavity 7-1 due to the diameter difference. The annular cavity 7-1 is below the piston 10. The lower sealing ring 18 is installed in the groove inside the lower part of the seating sleeve 17. The rubber cylinder 19 and the seating sleeve 17 are sleeved on the lower part of the inner tube 2. The lower sealing ring 18 seals the gap between the seating sleeve 17 and the inner tube 2. The upper part of the seating sleeve 17 is connected to the lower part of the hydraulic cylinder 7, and the connection is kept sealed. A receiving cavity 17-1 is formed between the interior of the seating sleeve 17 and the inner tube 2. The lower end of the vertical transfer hole 7-2 is communicated with the receiving cavity 17-1, and the upper part of the lower joint 20 is connected to the lower part of the inner tube 2. The lower end of the rubber cylinder 19 is seated on the upper end surface of the lower joint 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 prevent the lock ring 5 from moving in the upper part of the hydraulic cylinder 7, the pin sleeve 3 is fixed to the inner tube 2 by the upper pin 4, the outer wall of the inner tube 2 is provided with a one-way locking tooth 2-1, the outer one-way locking tooth 2-1 is located under the lock ring seat 6, the inner wall of the lock ring 5 is provided with 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 go down on the inner tube 2, and cannot go up, an injection port 14 is provided on the hydraulic cylinder 7, and the injection port 14 is communicated with the annular cavity 7-1,Silicone oil is filled into the annular cavity 7-1 through the injection port 14.

[0010] The hydraulic cylinder 7 is provided with an injection port 14 and an exhaust hole 13, so that the silicone oil can be filled into the annular cavity 7-1. The exhaust hole 13 is located at the upper end of the annular cavity 7-1. After the silicone oil is filled into the annular cavity 7-1, the exhaust hole 13 and the injection port 14 are closed to ensure that the silicone oil does not leak.

[0011] The upper part of the inner tube 2 is connected with an upper joint 1, which is connected to a pipe column. The lower part of the lower joint 20 is connected with a tail pipe, and the lower part of the tail pipe is connected with a check valve.

[0012] The silicone oil filled in the annular cavity 7-1 is a high-viscosity silicone oil with a viscosity greater than 5x10 4 mPa.s, up to 1.5x10 6 mPa.s.

[0013] After drilling is completed, the well is filled with mud, which needs to be replaced. The present invention and other completion tools are lowered to the designed position along with the casing, and the slurry replacement fluid is injected into the casing to replace the mud inside and outside the casing. Then, the pressure is applied to the pipe column, and 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, so that the start pin 9 is sheared off. After the start pin 9 is sheared off, the piston 10 starts to move downward, and the silicone oil pressure in the annular cavity 7-1 increases, and the pressure plate 16 is broken. The silicone 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 off. The pin sleeve 3, the lock ring 5, the lock ring seat 6, the hydraulic cylinder 7, and the sealing sleeve 17 move downward, and the rubber cylinder 19 is compressed and expanded to seal the well wall. At the same time, the lock ring 5 is buckled with the outer one-way lock tooth 2-1, and the compression and expansion state of the rubber cylinder 19 is fixed, so that it always seals the well wall.

Claims

1. A delayed start packer, comprising an inner tube (2), a pin sleeve (3), an upper pin (4), a locking ring (5), a locking ring seat (6), a hydraulic cylinder (7), an upper sealing ring (8), a start 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 cylinder (19), and a lower joint (20), wherein: The upper sealing ring (8) is installed in the groove on the boss section of the upper middle part of the inner tube (2). The inner tube (2) is provided with a pressure transmission hole (2-2), and the pressure transmission hole (2-2) is located below the upper sealing ring (8). The inner sealing ring (11) is installed in the inner wall groove of the piston (10). The outer sealing ring (12) is installed in the outer wall groove of the piston (10). The piston (10) is sleeved outside the inner tube (2). The piston (10) is located below the boss section of the upper middle part 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 located below the pressure transmission hole (2-2). The middle sealing ring (15) is installed in the groove inside the lower part of the hydraulic cylinder (7). The lower part of the hydraulic cylinder (7) A vertical transfer hole (7-2) is provided on the tube wall. The upper end of the vertical transfer hole (7-2) is communicated with the interior of the hydraulic cylinder (7). A fixed pressure plate (16) is installed at the lower part of the vertical transfer hole (7-2). The hydraulic cylinder (7) is sleeved on the inner tube (2) and the outside of 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 boss section at the middle and upper part 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 boss section at the middle and upper part of the inner tube (2) and the outer wall of the piston (10) is sealed by an upper sealing ring (8) and an outer sealing ring (12). An annular cavity (7-1) is formed between the inner wall of the middle part of the cylinder (7) and the outer wall of the inner tube (2) due to the diameter difference. The annular cavity (7-1) is located below the piston (10). The rubber cylinder (19) and the sealing sleeve (17) are sleeved on the lower part of the inner tube (2). The upper part of the sealing sleeve (17) is connected to the lower part of the hydraulic cylinder (7). A receiving cavity (17-1) is formed between the interior of the sealing sleeve (17) and the inner tube (2). The lower end of the vertical transfer hole (7-2) is communicated with the receiving cavity (17-1). The upper part of the lower joint (20) is connected to the lower part of the inner tube (2). The connection is kept sealed. The lower end of the rubber cylinder (19) is seated on the upper end surface of the lower joint (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) prevent the lock ring (5) from moving in the upper part of the hydraulic cylinder (7), the pin sleeve (3) is fixed to the inner tube (2) by the upper pin (4), the outer wall of the inner tube (2) is provided with an outer one-way locking tooth (2-1), the outer one-way locking tooth (2-1) is located below the lock ring seat (6), the inner wall of the lock ring (5) is provided with an inner one-way locking tooth, the inner one-way locking tooth of the inner wall of the lock ring (5) can be locked with the outer one-way locking tooth (2-1), after being locked, the lock ring (5) can only move downward on the inner tube (2) but not upward, an injection port (14) is provided on the hydraulic cylinder (7), the injection port (14) is communicated with the annular cavity (7-1),The annular cavity (7-1) is filled with silicone oil.

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