CN220059503U

CN220059503U - Permanent packer

Info

Publication number: CN220059503U
Application number: CN202321510319.XU
Authority: CN
Inventors: 田伟东; 尹震
Original assignee: Chengdu Dewei Petroleum Technology Service Co ltd
Current assignee: Chengdu Dewei Petroleum Technology Service Co ltd
Priority date: 2023-06-14
Filing date: 2023-06-14
Publication date: 2023-11-21
Anticipated expiration: 2033-06-14

Abstract

The utility model discloses a permanent packer which comprises a sealing cylinder mandrel, a rubber cylinder, a lower slip, a locking component, a lower joint, a piston connecting nipple, a bottom mandrel, an upper piston and a lower piston. The utility model adopts the arrangement of the upper piston and the lower piston to increase the acting area of pressure when pressing the oil pipe, thereby reducing the setting pressure when the utility model is used, being better applicable to the underground condition of uneven fluctuation of upper pressure and lower pressure, reducing the technical requirement on site pressing equipment and improving the production efficiency.

Description

Permanent packer

Technical Field

The utility model relates to the technical field of packers, in particular to a permanent packer.

Background

The packer refers to a downhole tool connected to a downhole string for sealing an annular space between an oil pipe and an oil-gas well casing or an open hole wall. At present, aiming at the production pipe column of gas wells of gas fields, most oil fields adopt a long-acting pipe column consisting of permanent packers, wherein the permanent packers have high pressure resistance and long effective period; secondly, the pipe column is immobilized for a long time, the operation times of the gas well are reduced, the stratum is effectively protected, secondary damage to the stratum caused by construction operation is avoided, and long-term effective normal production of the gas well is ensured.

The existing permanent packer generally comprises an upper joint, an insertion pipe, a pressing cap, an anchoring claw, a sealing combination, a central pipe, an upper slip, a lower slip, an anti-rotation key, an upper cone, a lower cone, a shear pin, an opening expansion ring, an expansion ring, a rubber cylinder, a spacer ring, a lock ring sleeve, a lock ring, a seal ring, a piston sleeve, a seal ring, a setting shear pin, a stable pin and a lower joint, wherein the piston is sleeved on the central pipe and the seal ring and is connected with the lower joint into a whole through the setting shear pin, and the piston sleeve is sleeved on the piston and the lower joint and is in threaded connection with the lower joint and fixed by the stable pin. When in construction, the upper part of the upper joint is connected with the oil pipe, the lower part of the lower joint is connected with the oil pipe to descend, after the pipe column descends in place, the pipe column is pressed from the inside of the oil pipe, the pressure acts on the piston from the liquid outlet hole, the setting shear pins and the shear pins are sheared off until the setting pressure of the packer is reached, and the upper slip, the lower slip, the opening expansion ring, the expansion ring and the rubber cylinder are firmly clung to and clamped on the inner wall of the sleeve, so that the setting process of the packer is completed.

However, in the actual use process, the setting pressure of the packer also changes due to uneven pressure fluctuation of the underground oil layer, and the existing permanent packer is only provided with a piston, so that the required setting pressure is large, the technical requirement on the on-site pressurizing equipment is high, the setting failure is easy to be caused, great inconvenience is brought to production, and the production efficiency is influenced.

Disclosure of Invention

The object of the present utility model is to provide a permanent packer that solves the above mentioned problems of the background art.

In order to solve the technical problems, the utility model provides a permanent packer which comprises a sealing cylinder mandrel, a rubber cylinder, a lower slip, a locking assembly and a lower joint, and further comprises a piston connecting nipple, a bottom mandrel, an upper piston and a lower piston, wherein the piston connecting nipple is sleeved at the bottom of the sealing cylinder mandrel and is connected with the sealing cylinder mandrel through the locking assembly, two ends of the bottom mandrel are respectively connected with the sealing cylinder mandrel and the lower joint in a threaded manner, the upper piston is sleeved on the sealing cylinder mandrel and the bottom mandrel and is respectively in sliding contact with the sealing cylinder mandrel and the bottom mandrel, the upper piston is kept sealed with the sealing cylinder mandrel and the bottom mandrel, a first end of the upper piston is fixedly connected with the piston connecting nipple, the lower piston is arranged between the bottom mandrel and the lower joint and is respectively in sliding contact with the bottom mandrel and the lower joint, the lower piston is kept sealed with the bottom mandrel and the lower joint, and the top of the lower piston is fixedly connected with a second end of the upper piston.

Further, the first ratchet is fixedly installed on the sealing cylinder mandrel, the locking assembly comprises a slip bracket and an inner slip, the slip bracket is sleeved on the sealing cylinder mandrel and is respectively connected with the sealing cylinder mandrel and the piston connecting nipple through a plurality of locating pins, the lower slip is installed on the slip bracket, the inner slip is arranged between the sealing cylinder mandrel and the slip bracket and is installed on the slip bracket, a second ratchet is fixedly installed on the inner surface of the inner slip, and the second ratchet is meshed with the first ratchet.

Further, a first sealing groove is formed in the upper piston, a second sealing groove is formed in the bottom mandrel, a third sealing groove is formed in two sides of the lower piston, and sealing rings are arranged in the first sealing groove, the second sealing groove and the third sealing groove.

Further, back rings are arranged on two sides of each sealing ring.

Further, the rubber cylinder comprises a middle rubber cylinder and end rubber cylinders, the middle rubber cylinder is sleeved on the sealing cylinder mandrel, the number of the end rubber cylinders is two, and the two end rubber cylinders are respectively installed at two ends of the middle rubber cylinder and are respectively sleeved on the sealing cylinder mandrel.

Further, shoulder processes are arranged on the outer sides of the two end rubber barrels.

The beneficial effects of the utility model are as follows:

the utility model is provided with the piston connecting nipple, the bottom mandrel, the upper piston and the lower piston, and the arrangement of the upper piston and the lower piston increases the acting area of pressure when pressing the inside of the oil pipe, thereby reducing the setting pressure when the utility model is used, leading the utility model to be better suitable for the underground situation with uneven fluctuation of the upper pressure and the lower pressure, reducing the technical requirement on site pressing equipment and improving the production efficiency.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present utility model.

Fig. 2 is a schematic diagram of a first partial structure according to an embodiment of the present utility model.

Fig. 3 is a schematic diagram of a second partial structure according to an embodiment of the present utility model.

Fig. 4 is a schematic view of a third partial structure according to an embodiment of the present utility model.

Fig. 5 is an enlarged schematic view of the portion a in fig. 3.

Fig. 6 is an enlarged schematic view of the portion B in fig. 4.

Fig. 7 is an enlarged schematic view of the portion C in fig. 4.

Fig. 8 is an enlarged schematic view of the portion D in fig. 4.

Wherein: 1. a sealing cylinder mandrel; 2. an anti-rotation sleeve; 3. an upper slip; 4. a wedge is arranged; 5. shearing pins; 6. a rubber cylinder; 7. a lower wedge; 8. a lower slip; 9. positioning pins; 10. a seal ring; 11. a locking assembly; 12. a lower joint; 13. the piston is connected with the nipple; 14. a bottom mandrel; 15. an upper piston; 16. a lower piston; 17. a back ring; 18. shoulder.

601. A middle rubber cylinder; 602. an end rubber cylinder; 1101. a slip bracket; 1102. an inner slip.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only one embodiment of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

The present utility model will be described in further detail with reference to the drawings and the embodiments, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

In the following description, references to "one embodiment," "an embodiment," "one example," "an example," etc., indicate that the embodiment or example so described may include a particular feature, structure, characteristic, property, element, or limitation, but every embodiment or example does not necessarily include the particular feature, structure, characteristic, property, element, or limitation. In addition, repeated use of the phrase "according to an embodiment of the utility model" does not necessarily refer to the same embodiment, although it may.

As shown in fig. 1-8, the utility model discloses a permanent packer, which comprises a sealing cylinder mandrel 1, a rubber cylinder 6, a lower slip 8, a locking assembly 11 and a lower joint 12, and further comprises a piston connecting nipple 13, a bottom mandrel 14, an upper piston 15 and a lower piston 16. The piston connecting nipple 13 is sleeved at the bottom of the sealing cylinder mandrel 1 and is connected with the sealing cylinder mandrel 1 through the locking component 11, and two ends of the bottom mandrel 14 are respectively in threaded connection with the sealing cylinder mandrel 1 and the lower joint 12. The upper piston 15 is sleeved on the sealing cylinder mandrel 1 and the bottom mandrel 14 and is in sliding contact with the sealing cylinder mandrel 1 and the bottom mandrel 14 respectively, the upper piston 15 is kept sealed with the sealing cylinder mandrel 1 and the bottom mandrel 14, and the first end of the upper piston 15 is fixedly connected with the piston connecting nipple 13. A first cavity is formed between the upper piston 15 and the sealing cylinder mandrel 1 and between the upper piston 15 and the bottom mandrel 14, and a first pressure transmission hole is formed in the position, corresponding to the sealing cylinder mandrel 1, of the first cavity. The lower piston 16 is disposed between the bottom core shaft 14 and the lower joint 12 and is in sliding contact with the bottom core shaft 14 and the lower joint 12, respectively, the lower piston 16 maintains a seal with the bottom core shaft 14 and the lower joint 12, and the top of the lower piston 16 is fixedly connected with the second end of the upper piston 15. A second cavity is formed between the lower piston 16 and the bottom core shaft 14 and the lower joint 12, and a second pressure transmission hole is arranged at a position corresponding to the bottom core shaft 14 in the second cavity. In this embodiment, the seal cylinder mandrel 1, the bottom mandrel 14 and the lower joint 12 are all connected through threads, and an anti-rotation sleeve 2, an upper slip 3, an upper wedge 4, a shear pin 5, a rubber cylinder 6, a lower wedge 7, a shear pin 5, a lower slip 8, a locking assembly 11, a piston connecting nipple 13, an upper piston 15 and a lower piston 16 are sequentially arranged on the seal cylinder mandrel 1, the bottom mandrel 14 and the lower joint 12 from top to bottom. The bottom of the lower piston 16 and the lower joint 12 are secured by a setting pin. The present embodiment is used in conjunction with an external insert seal assembly to connect with tubing.

The worker inserts the insertion seal assembly into the packer to install the insertion seal assembly, and then lowers the packer to the designed depth in the well. The staff presses the inside of the oil pipe again, and the pressure enters from the first pressure transmission hole of the sealing cylinder mandrel 1 and the second pressure transmission hole of the bottom mandrel 14 and acts on the upper piston 15 and the lower piston 16 respectively, and simultaneously pushes the upper piston 15 and the lower piston 16 to move upwards, drives the piston connecting nipple 13 to move upwards and cuts the preset setting pin. The lower slips 8 move up onto the lower wedges 7 while the shear pins 5 on the lower wedges 7 are sheared, and the packing element 6 is forced against the upper wedges 4, causing the shear pins 5 on the upper wedges 4 to be sheared and the upper wedges 4 to snap under the upper slips 3. At this point, the upper slips bite into the inner wall of the casing. The rubber cylinder 6 is compressed to form a seal, the lower slips are meshed with the sleeve, and the locking assembly 11 is locked and set. The arrangement of the upper piston 15 and the lower piston 16 increases the acting area of pressure when pressing the inside of the oil pipe, thereby reducing the setting pressure when the hydraulic oil pump is used, being better applicable to the underground condition of uneven fluctuation of the upper pressure and the lower pressure, reducing the technical requirement on site pressing equipment and improving the production efficiency.

In one embodiment, a first ratchet is fixedly mounted on the seal cartridge mandrel 1 and the locking assembly 11 includes a slip bracket 1101 and an inner slip 1102. The slip bracket 1101 is sleeved on the sealing cylinder mandrel 1 and is respectively connected with the sealing cylinder mandrel 1 and the piston connecting nipple 13 through a plurality of positioning pins 9, and the lower slip 8 is installed on the slip bracket 1101. An inner click piece 1102 is provided between the seal cartridge mandrel 1 and the slip bracket 1101 and is mounted on the slip bracket 1101, and a second ratchet is fixedly mounted on the inner surface of the inner click piece 1102, the second ratchet being engaged with the first ratchet. In this embodiment, the slip bracket 1101 is connected to the seal cartridge mandrel 1 by two locating pins 9, and the slip bracket 1101 is connected to the top of the piston nipple by one locating pin 9.

When setting, the upper piston 15 and the lower piston 16 drive the piston connecting nipple 13 to move upwards, and simultaneously drive the slip bracket 1101 to move upwards. The inner locking shoe 1102 in the slip bracket 1101 also moves upwardly and the second ratchet teeth on the inner locking shoe 1102 engage the first ratchet teeth on the seal cartridge mandrel 1 to effectively prevent the slips from collapsing and thereby lock the setting.

In one embodiment, the upper piston 15 is provided with a first sealing groove, the bottom mandrel 14 is provided with a second sealing groove, both sides of the lower piston 16 are provided with third sealing grooves, and sealing rings 10 are arranged in the first sealing groove, the second sealing groove and the third sealing groove. In this embodiment, the number of the first seal grooves is two and corresponds to the seal barrel mandrel 1, the two first seal grooves are arranged at intervals in the longitudinal direction, the number of the second seal grooves is two and corresponds to the upper piston 15, the two second seal grooves are arranged at intervals in the longitudinal direction, the number of the third seal grooves is four, the four third seal grooves are arranged at intervals in the longitudinal direction, wherein the two third seal grooves correspond to the bottom mandrel 14, and the other two third seal grooves correspond to the lower joint 12. And a sealing ring 10 is fixedly arranged in each first sealing groove, each second sealing groove and each third sealing groove.

In one embodiment, each seal ring 10 is provided with a back ring 17 on both sides. The extrusion gap between the seal ring 10 and the groove is reduced, so that the seal ring 10 is more wear-resistant.

In one embodiment, the rubber cylinder 6 includes a middle rubber cylinder 6016 and end rubber cylinders 6026, the middle rubber cylinder 6016 is sleeved on the sealing cylinder mandrel 1, the number of the end rubber cylinders 6026 is two, and the two end rubber cylinders 6026 are respectively installed at two ends of the middle rubber cylinder 6016 and are respectively sleeved on the sealing cylinder mandrel 1. The packer has strong bidirectional pressure difference resistance, good pressure bearing performance and stability, and good setting effect.

In one embodiment, shoulders 18 are mounted on the outer sides of both end cylinders 6026 to prevent the cylinders 6 from cracking due to the too large shoulders 18 during compression of the cylinders 6.

The workflow of this embodiment is as follows:

the worker inserts the insertion seal assembly into the packer to install the insertion seal assembly, and then lowers the packer to the designed depth in the well. The staff presses the inside of the oil pipe again, and the pressure enters from the first pressure transmission hole of the sealing cylinder mandrel 1 and the second pressure transmission hole of the bottom mandrel 14 and acts on the upper piston 15 and the lower piston 16 respectively, and simultaneously pushes the upper piston 15 and the lower piston 16 to move upwards, drives the piston connecting nipple 13 to move upwards and cuts the preset setting pin. At the same time, the piston connecting nipple 13 drives the slip bracket 1101 to move upwards, the inner clamping tile 1102 in the slip bracket 1101 also moves upwards, and the second ratchet teeth on the inner clamping tile 1102 are meshed with the first ratchet teeth on the sealing cylinder mandrel 1. The shear pin 5 on the lower wedge 7 is sheared while the slip bracket 1101 drives the lower slips 8 to move up onto the lower wedge 7, and the packing element 6 is forced against the upper wedge 4, causing the shear pin 5 on the upper wedge 4 to be sheared and the upper wedge 4 to snap under the upper slips 3. At this point, the upper slips bite into the inner wall of the casing. The packing element 6 compresses, forms a seal, and lower slips interlock with the casing, and inner slips 1102 interlock with the mandrel, preventing slips from shrinking and setting is complete. The utility model adopts the arrangement of the upper piston 15 and the lower piston 16 to increase the acting area of pressure when pressing the inside of the oil pipe, thereby reducing the setting pressure when the utility model is used, leading the utility model to be better suitable for the underground situation of uneven fluctuation of the upper pressure and the lower pressure, reducing the technical requirement on site pressing equipment and improving the production efficiency.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a permanent packer, includes seal cylinder dabber, packing element, slips down, locking subassembly and lower joint, its characterized in that: the piston connecting nipple is sleeved at the bottom of the sealing cylinder mandrel and is connected with the sealing cylinder mandrel through the locking assembly, two ends of the bottom mandrel are respectively connected with the sealing cylinder mandrel and the lower connector in a threaded mode, the upper piston is sleeved on the sealing cylinder mandrel and the bottom mandrel and is respectively in sliding contact with the sealing cylinder mandrel and the bottom mandrel, the upper piston is in sealing connection with the sealing cylinder mandrel and the bottom mandrel, a first end of the upper piston is fixedly connected with the piston connecting nipple, the lower piston is arranged between the bottom mandrel and the lower connector and is respectively in sliding contact with the bottom mandrel and the lower connector, the lower piston is sealed with the bottom mandrel and the lower connector in a sealing mode, and the top of the lower piston is fixedly connected with a second end of the upper piston.

2. A permanent packer according to claim 1, characterized in that: the sealing cylinder mandrel is fixedly provided with a first ratchet, the locking assembly comprises a slip bracket and an inner slip, the slip bracket is sleeved on the sealing cylinder mandrel and is respectively connected with the sealing cylinder mandrel and the piston connecting nipple through a plurality of locating pins, the slip bracket is provided with a lower slip, the inner slip is arranged between the sealing cylinder mandrel and the slip bracket and is arranged on the slip bracket, the inner surface of the inner slip is fixedly provided with a second ratchet, and the second ratchet is meshed with the first ratchet.

3. A permanent packer according to claim 1, characterized in that: the upper piston is provided with a first sealing groove, the bottom mandrel is provided with a second sealing groove, both sides of the lower piston are provided with third sealing grooves, and sealing rings are arranged in the first sealing groove, the second sealing groove and the third sealing grooves.

4. A permanent packer according to claim 3, characterized in that: and back rings are arranged on two sides of each sealing ring.

5. A permanent packer according to claim 1, characterized in that: the packing element includes well packing element and end packing element, well packing element cover is established seal cylinder dabber, the quantity of end packing element is two, two end packing element install respectively the both ends of well packing element, and overlap respectively and establish seal cylinder dabber.

6. A permanent packer according to claim 5, characterized in that: shoulder processes are arranged on the outer sides of the two end rubber barrels.