Packer

Abstract

A middle sealing ring, an opening locking ring and an unsealing sleeve are installed on an inner pipe, the unsealing sleeve is connected to the inner pipe through an unsealing pin, an upper sealing ring is installed in the lower portion of a setting piston, the setting piston is sleeved on the inner pipe, an upper protective sleeve, a rubber sleeve and a lower protective sleeve are sleeved outside the lower portion of a rubber sleeve shaft, the rubber sleeve shaft is sleeved outside the inner pipe, and the inner pipe is sleeved outside the rubber sleeve shaft. The rubber sleeve shaft and the setting piston are connected into a whole through a setting pin, the well washing piston is installed between the rubber sleeve shaft and the inner pipe, the upper connector is connected with the upper portion of the inner pipe and the upper portion of the rubber sleeve shaft, the locking and sealing cylinder is connected with the lower portion of the setting piston, and a fit clearance between the inner wall of the locking and sealing cylinder and the boss section is sealed through a middle sealing ring. One-way outer teeth on the outer wall of the opening lock ring and the one-way inner teeth can be connected into a whole in a matched mode, the soluble piston is sleeved between the inner pipe and the locking and sealing cylinder, the lower sealing ring is installed outside the upper portion of the lower connector, the upper inner portion of the lower connector is connected with the lower portion of the inner pipe, and the upper outer portion of the lower connector is inserted into the lower portion of the locking and sealing cylinder.

Description

Technical Field

[0001] The utility model relates to a separating device for stratified water injection in oil fields, which is a packer. Background Technique

[0002] Oil fields in our country are all developed by water injection. There are many water injection wells in each oil field. Most of the water injection wells are multi-layer water injection, and it is necessary to lower multi-stage water injection packers into the wells. At present, the main water injection packer is a hydraulic packer, that is, the Y341 type packer.

[0003] In order to ensure the long-term effective operation of the packer and prevent the rubber barrel of the packer from being punctured by pressure under the action of pressure difference, it is required that the difference between the outer diameter of the steel body of the existing packer and the inner diameter of the casing should not be greater than 10 mm. However, at present, most of the water injection wells are old wells, and the casings of many water injection wells have been deformed and reduced in diameter. If the packer designed according to the above-mentioned principle of the outer diameter of the steel body is lowered into the well, problems such as pipe jamming and resistance will occur. In case of such problems, it will cause difficulties in operation at least, and serious engineering accidents at worst, resulting in significant economic losses. Summary of the Invention

[0004] Increase the diameter difference

[0005] The purpose of the utility model is to provide a packer, which can ensure the long-term normal operation of the rubber barrel of the packer after reducing the outer diameter of the steel body and overcome the above-mentioned existing problems.

[0006] The object of the present utility model is achieved as follows: It includes an upper joint, a rubber barrel shaft, a flushing piston, an upper sheath, a rubber barrel, a lower sheath, a setting pin, an inner tube, a setting piston, an upper sealing ring, a middle sealing ring, an opening lock ring, a releasing pin, a releasing sleeve, a locking barrel, a soluble piston, a lower sealing ring, and a lower joint. There is a boss section in the middle and lower part of the inner tube. Above the boss section is an upper outer section, and below the boss section is a lower outer section. A middle sealing ring is installed on the boss section. An opening lock ring and a releasing sleeve are sleeved on the lower part of the boss section. The lower end of the opening lock ring sits on the releasing sleeve. The releasing sleeve is connected to the inner tube by a releasing pin. A lower pressure transmission hole is provided in the lower part of the upper outer section. An upper sealing ring is installed inside the lower part of the setting piston. The lower part of the setting piston is sleeved on the upper outer section. The upper sealing ring is above the lower pressure transmission hole. The upper sealing ring seals the gap between the upper outer section and the lower part of the setting piston. There is a lower communication groove in the upper section of the setting piston. The lower communication groove is above the upper sealing ring. The upper sheath, the rubber barrel, and the lower sheath are sleeved on the lower outer part of the rubber barrel shaft. The upper sheath buckles downwards on the upper end of the rubber barrel, and the lower sheath buckles upwards on the lower end of the rubber barrel. The rubber barrel shaft is sleeved outside the upper outer section. The lower part of the rubber barrel shaft is inserted into the upper part of the setting piston. The rubber barrel shaft and the setting piston are connected into one body by a setting pin. The upper part of the upper sheath is limited by the shoulder of the rubber barrel shaft so that it cannot move upwards. The lower end of the lower sheath is limited by the upper end of the setting piston. A flushing channel is formed between the upper outer section and the lower inner part of the rubber barrel shaft due to the diameter difference. An upper pressure transmission hole is provided below the external thread in the upper part of the inner tube. A flushing piston is installed between the upper inner part of the rubber barrel shaft and the upper outer part of the inner tube. There is an upper communication groove on the rubber barrel shaft. The upper communication groove is above the internal shoulder of the rubber barrel shaft. There is a seal between the inner wall of the flushing piston and the upper outer part of the inner tube. The seal is below the upper pressure transmission hole. There is a seal between the outer wall of the flushing piston and the upper inner wall of the rubber barrel shaft. The seal is above the upper communication groove. When the flushing piston drops to the internal shoulder of the rubber barrel shaft, it can block the flushing channel so that the liquid flow cannot flow downwards. The lower inner part of the upper joint is connected to the upper part of the inner tube. The connection point is above the upper pressure transmission hole. The lower outer part of the upper joint is connected to the upper part of the rubber barrel shaft. The connection part is kept sealed. The locking barrel is sleeved on the boss section and its upper part is connected to the lower part of the setting piston. The connection part is kept sealed. The matching gap between the inner wall of the locking barrel and the boss section is sealed by the middle sealing ring. There are single-direction external teeth on the outer wall of the opening lock ring. There are single-direction internal teeth on the middle and lower inner wall of the locking barrel. The single-direction internal teeth are below the releasing sleeve. The single-direction external teeth on the outer wall of the opening lock ring can be mated with the single-direction internal teeth into one body. After being mated into one body, the setting piston can only move upwards and cannot move downwards on the rubber barrel shaft. The soluble piston is sleeved between the lower outer section and the lower inner wall of the locking barrel. The soluble piston is below the single-direction internal teeth. The inner wall of the soluble piston is sealed with the lower outer section in a matching manner. The outer wall of the soluble piston is sealed with the inner wall of the locking barrel in a matching manner. The lower sealing ring is installed on the upper outer part of the lower joint. The upper inner part of the lower joint is connected to the lower part of the inner tube.The connection part is kept sealed. The upper outer part of the lower joint is inserted into the lower part of the locking seal cylinder, and the gap between the upper outer part of the lower joint and the lower internal mating section of the locking seal cylinder is sealed by a lower sealing ring.

[0007] When the locking seal cylinder moves up 5 - 30 mm on the lower joint, the lower sealing ring no longer seals the gap between the upper outer part of the lower joint and the lower internal part of the locking seal cylinder, enabling the well fluid to contact the soluble piston. After the well fluid contacts the soluble piston for more than 24 hours, the soluble piston dissolves.

[0008] The materials of the upper sheath and the lower sheath are non - metallic, and the hardness of the upper sheath and the lower sheath is 5 - 15 Shore higher than that of the rubber cylinder.

[0009] The beneficial effects of the present utility model are as follows: The upper sheath, the lower sheath and the soluble piston are provided, so that after the outer diameters of the steel bodies of the rubber cylinder shaft, the setting piston and the locking seal cylinder are reduced, the rubber cylinder can work effectively for a long time. When used in an injection well with deformed or reduced - diameter casing, problems such as pipe string jamming and resistance will not occur, ensuring the smooth operation of the operation and preventing engineering accidents, and having significant economic benefits. Description of the Drawings

[0010] Figure 1 It is the structural assembly drawing of the present utility model. Detailed Embodiment

[0011] The following Figure 1 describes the embodiments of the present utility model.

[0012] From the appendix Figure 1It can be seen that the embodiments of the present utility model include an upper joint 1, a rubber barrel shaft 2, a flushing piston 3, an upper sheath 5, a rubber barrel 6, a lower sheath 7, a setting pin 9, an inner tube 10, a setting piston 11, an upper sealing ring 12, a middle sealing ring 13, an opening lock ring 14, a releasing pin 15, a releasing sleeve 16, a locking barrel 17, a soluble piston 18, a lower sealing ring 19, and a lower joint 20. There is a boss section 10-4 in the middle and lower part of the inner tube 10. Above the boss section 10-4 is an upper outer section 10-2, and below the boss section 10-4 is a lower outer section 10-5. The middle sealing ring 13 is installed on the boss section 10-4. The opening lock ring 14 and the releasing sleeve 16 are sleeved on the lower part of the boss section 10-4. The lower end of the opening lock ring 14 sits on the releasing sleeve 16. The releasing sleeve 16 is connected to the inner tube 10 by the releasing pin 15. A lower pressure transmission hole 10-3 is provided at the lower part of the upper outer section 10-2. The upper sealing ring 12 is installed inside the lower part of the setting piston 11. The lower part of the setting piston 11 is sleeved on the upper outer section 10-2. The upper sealing ring 12 is above the lower pressure transmission hole 10-3. The upper sealing ring 12 seals the gap between the upper outer section 10-2 and the lower part of the setting piston 11. There is a lower communication groove 11-1 on the upper section of the setting piston 11. The lower communication groove 11-1 is above the upper sealing ring 12. The upper sheath 5, the rubber barrel 6, and the lower sheath 7 are sleeved on the lower outer part of the rubber barrel shaft 2. The upper sheath 5 buckles downwards on the upper end of the rubber barrel 6, and the lower sheath 7 buckles upwards on the lower end of the rubber barrel 6. The rubber barrel shaft 2 is sleeved outside the upper outer section 10-2. The lower part of the rubber barrel shaft 2 is inserted into the upper part of the setting piston 11. The rubber barrel shaft 2 and the setting piston 11 are connected into one body by the setting pin 9. The upper part of the upper sheath 5 is limited by the shoulder of the rubber barrel shaft 2 and cannot move upwards. The lower end of the lower sheath 7 is limited by the upper end of the setting piston 11. A flushing channel 2-2 is formed between the upper outer section 10-2 and the lower inner part of the rubber barrel shaft 2 due to the diameter difference. An upper pressure transmission hole 10-1 is provided below the external thread on the upper part of the inner tube 10. A flushing piston 3 is installed between the upper inner part of the rubber barrel shaft 2 and the upper outer part of the inner tube 10. There is an upper communication groove 2-1 on the rubber barrel shaft 2. The upper communication groove 2-1 is above the inner shoulder of the rubber barrel shaft 2. The inner wall of the flushing piston 3 and the upper outer part of the inner tube 10 are sealed by a sealing member. The sealing member is below the upper pressure transmission hole 10-1. The outer wall of the flushing piston 3 and the upper inner wall of the rubber barrel shaft 2 are sealed by a sealing member. The sealing member is above the upper communication groove 2-1. When the flushing piston 3 drops to the inner shoulder of the rubber barrel shaft 2, it can block the flushing channel 2-2 and prevent the liquid flow from flowing downwards. The lower inner part of the upper joint 1 is connected to the upper part of the inner tube 10, and the connection point is above the upper pressure transmission hole 10-1. The lower outer part of the upper joint 1 is connected to the upper inner part of the rubber barrel shaft 2, and the connection part is kept sealed. The locking barrel 17 is sleeved on the boss section 10-4 and its upper part is connected to the lower part of the setting piston 11, and the connection part is kept sealed. The matching gap between the inner wall of the locking barrel 17 and the boss section 10-4 is sealed by the middle sealing ring 13.The outer wall of the open lock ring 14 has single-direction external teeth, and the inner wall of the middle and lower part of the lock sealing cylinder 17 has single-direction internal teeth 17-1. The single-direction internal teeth 17-1 are located below the unsealing sleeve 16. The single-direction external teeth on the outer wall of the open lock ring 14 can be mated with the single-direction internal teeth 17-1 to form an integral body. After being mated into an integral body, the seat sealing piston 11 can only move upward and not downward on the rubber cylinder shaft 2. The soluble piston 18 is sleeved between the lower outer section 10-5 and the inner wall of the lower part of the lock sealing cylinder 17. The soluble piston 18 is located below the single-direction internal teeth 17-1. The inner wall of the soluble piston 18 is hermetically fitted with the lower outer section 10-5, and the outer wall of the soluble piston 18 is hermetically fitted with the inner wall of the lock sealing cylinder 17. The lower sealing ring 19 is installed outside the upper part of the lower joint 20. The upper inner part of the lower joint 20 is connected to the lower part of the inner pipe 10, and the connection is kept sealed. The upper outer part of the lower joint 20 is inserted into the lower part of the lock sealing cylinder 17, and the gap between the upper outer part of the lower joint 20 and the inner mating section of the lower part of the lock sealing cylinder 17 is sealed by the lower sealing ring 19. In order to save materials and processing costs, the inner pipe 10 can be designed as a composite part.,

[0013] Preferably, when the lock sealing cylinder 17 moves upward 5-30 mm on the lower joint 20, the lower sealing ring 19 no longer seals the gap between the upper outer part of the lower joint 20 and the lower inner part of the lock sealing cylinder 17, so that the well fluid can contact the soluble piston 18. After the well fluid contacts the soluble piston 18 for more than 24 hours, the soluble piston 18 dissolves.

[0014] Preferably, the materials of the upper sheath 5 and the lower sheath 7 are non-metallic, and the hardness of the upper sheath 5 and the lower sheath 7 is 5-15 Shore higher than that of the rubber cylinder 6.

[0015] After the downhole tool of the present utility model is lowered into the well, first, pressure is applied to the water injection pipe. The pressure is transmitted through the lower pressure transmission hole to the bottom of the seat sealing piston 11, and the upward thrust generated causes the seat sealing pin 9 to be sheared off. After the seat sealing piston 11 moves upward 5-30 mm, pressure is applied to make the upward thrust generated by the seat sealing piston 11 and the upward thrust generated by the well pressure on the soluble piston 18 in the present utility model (the upper part of the soluble piston 18 is air) jointly compress the rubber cylinder 6, so that it expands to seal the casing. At the same time, the single-direction internal teeth 17-1 move upward to be buckled with the open lock ring 14 to form an integral body, fixing the thrust, and the rubber cylinder 6 can always seal the casing.

[0016] When injecting water, the pressure in the inner pipe 10 is higher than the casing pressure. The pressure is transmitted through the lower pressure transmission hole 10-1 to the upper end of the washing well piston 3, causing it to move downward to block the washing well channel 2-2, and then the water injection well can carry out layered water injection.

[0017] During backwashing, the casing pressure is higher than the pressure inside the inner pipe 10, and the washing piston 3 is pushed away from the upper port of the washing channel 2-2. The upper communication groove 2-1, the washing channel 2-2, and the lower communication groove 11-1 communicate with each other to form a washing channel, and the injection well can be normally backwashed.

[0018] When pulling up the injection pipe string during workover, the unsealing pin 15 is cut off, and the opening lock ring 14 and the locking cylinder 17 move downward simultaneously, losing the pushing pressure on the rubber cylinder 6. The rubber cylinder 6 returns to its original state to achieve unsealing, and the injection pipe string can be smoothly pulled out.

[0019] The upper centralizer sleeve 4 and the lower centralizer sleeve 8 of the present utility model are made of non-metallic materials with relatively high hardness, which can not only ensure strength but also be fished out by means of drilling pressure in the case of severe deformation of the casing, thus avoiding forestry engineering accidents.

Claims

1. A packer, comprising an upper sub (1), a rubber barrel shaft (2), a washing well piston (3), an upper sheath (5), a rubber barrel (6), a lower sheath (7), a setting pin (9), an inner tube (10), a setting piston (11), an upper sealing ring (12), a middle sealing ring (13), an opening lock ring (14), a releasing pin (15), a releasing sleeve (16), a locking barrel (17), a soluble piston (18), a lower sealing ring (19), a lower sub (20), characterized in that: The inner tube (10) has a boss section (10-4) at the middle and lower part, an upper outer section (10-2) is located above the boss section (10-4), and a lower outer section (10-5) is located below the boss section (10-4). A middle sealing ring (13) is installed on the boss section (10-4), and an open lock ring (14) and an unsealing sleeve (16) are sleeved on the lower part of the boss section (10-4). The lower end of the open lock ring (14) sits on the unsealing sleeve (16), and the unsealing sleeve (16) is connected to the inner tube (10) by an unsealing pin (15). A lower pressure transmission hole (10-3) is provided at the lower part of the upper outer section (10-2), an upper sealing ring (12) is installed in the lower part of the sealing piston (11), and the lower part of the sealing piston (11) is sleeved on the upper The outer section (10-2) is provided with an upper sealing ring (12) located above the lower pressure transmission hole (10-3). The upper sealing ring (12) seals the gap between the upper outer section (10-2) and the lower part of the sealing piston (11). The upper section of the sealing piston (11) has a lower connecting groove (11-1). The lower connecting groove (11-1) is located above the upper sealing ring (12). The upper sleeve (5), the rubber cylinder (6), and the lower sleeve (7) are sleeved outside the lower part of the rubber cylinder shaft (2). The upper sleeve (5) buckles the upper end of the rubber cylinder (6) downwardly. The lower sleeve (7) buckles the lower end of the rubber cylinder (6) upwardly. The rubber cylinder shaft (2) is sleeved outside the upper outer section (10-2). The lower part of the rubber cylinder shaft (2) is inserted into the upper part of the sealing piston (11). The rubber cylinder shaft (2) and the sealing piston (11) are connected. The sealing piston (11) is connected as a whole by a sealing pin (9), the upper part of the upper sleeve (5) is limited by the shoulder of the rubber cylinder shaft (2) so that it cannot move upward, the lower end of the lower sleeve (7) is limited by the upper end of the sealing piston (11), a well washing channel (2-2) is formed between the upper outer section (10-2) and the lower inner part of the rubber cylinder shaft (2) due to the diameter difference, an upper pressure transmission hole (10-1) is provided under the upper outer thread of the inner tube (10), a well washing piston (3) is installed between the upper inner part of the rubber cylinder shaft (2) and the upper outer part of the inner tube (10), an upper connecting groove (2-1) is provided on the rubber cylinder shaft (2), and the upper connecting groove (2-1) is located on the inner shoulder of the rubber cylinder shaft (2), and there is a well washing piston (3) between the inner wall of the well washing piston (3) and the upper outer part of the inner tube (10). The seal is sealed, and the seal is located below the upper pressure transmission hole (10-1). A seal is sealed between the outer wall of the well-washing piston (3) and the upper inner wall of the rubber cylinder shaft (2). The seal is located above the upper connecting groove (2-1). When the well-washing piston (3) falls onto the inner shoulder of the rubber cylinder shaft (2), it can block the well-washing channel (2-2) so that the liquid cannot flow downward. The lower inner part of the upper joint (1) is connected to the upper part of the inner tube (10), and the connection point is located above the upper pressure transmission hole (10-1). The lower outer part of the upper joint (1) is connected to the upper part of the rubber cylinder shaft (2), and the connection is kept sealed. After the lock seal cylinder (17) is sleeved on the boss section (10-4), its upper part is connected to the lower part of the seat seal piston (11), and the connection is kept sealed.The mating clearance between the inner wall of the locking cylinder (17) and the convex platform section (10-4) is sealed by the middle sealing ring (13). The outer wall of the open locking ring (14) has a one-way external thread, and the middle and lower inner wall of the locking cylinder (17) has a one-way internal thread (17-1). The one-way internal thread (17-1) is located below the unsealing sleeve (16). The one-way external thread on the outer wall of the open locking ring (14) can be mated with the one-way internal thread (17-1) to form an integral body. After being mated into an integral body, the seat sealing piston (11) can only move upward and not downward on the rubber cylinder shaft (2). The soluble piston (18) is sleeved between the lower outer section (10-5) and the lower inner wall of the locking cylinder (17). The soluble piston (18) is located below the one-way internal thread (17-1). The inner wall of the soluble piston (18) is sealed in cooperation with the lower outer section (10-5). The outer wall of the soluble piston (18) is sealed in cooperation with the inner wall of the locking cylinder (17). The lower sealing ring (19) is installed outside the upper part of the lower joint (20). The upper inner part of the lower joint (20) is connected to the lower part of the inner pipe (10), and the connection is kept sealed. The upper outer part of the lower joint (20) is inserted into the lower part of the locking cylinder (17). The clearance between the upper outer part of the lower joint (20) and the lower internal mating section of the locking cylinder (17) is sealed by the lower sealing ring (19).

2. The packer according to claim 1, characterized in that: When the locking cylinder (17) moves up 5 - 30 mm on the lower sub (20), the lower sealing ring (19) no longer seals the gap between the upper exterior of the lower sub (20) and the lower interior of the locking cylinder (17), allowing well fluid to contact the soluble piston (18). After the well fluid contacts the soluble piston (18) for more than 24 hours, the soluble piston (18) dissolves.

3. A packer according to claim 1, wherein: The materials of the upper sheath (5) and the lower sheath (7) are non-metallic, and the hardness of the upper sheath (5) and the lower sheath (7) is 5 - 15 Shore higher than that of the rubber cylinder (6).

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