Thermal recovery packer

Abstract

The utility model discloses a thermal recovery packer, and relates to the technical field of oil field downhole tools. The outer circle of the cone extends downwards to form a limit sleeve, the support sleeve is sleeved with the limit sleeve, an annular groove is formed in an inner hole in the lower portion of the limit sleeve, an elastic ring is arranged in the annular groove, a limit groove is formed in the portion, above the elastic ring, of the outer circle of the support sleeve, a setting pin is arranged between the limit sleeve and the support sleeve, and a capsule is arranged in the space among the limit sleeve, the support sleeve and the center pipe. And the capsule is filled with water. The utility model has the beneficial effects that the elastic ring is arranged between the cone and the support sleeve, water in the capsule is gasified by high-temperature steam, the volume of the capsule is expanded to push the cone to rise, so that the rubber sleeve is expanded for setting, when the cone rises until the elastic ring falls into the limiting groove, the cone is limited in the axial direction, the setting of the rubber sleeve is reliable and is not influenced by the temperature of the injected steam, and the sealing effect is good. During deblocking, the tubular column is lifted upwards, the deblocking pin is cut off, axial limiting of the supporting sleeve is relieved, the cone descends under the action of the compression spring, and the rubber sleeve retracts to deblock.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield downhole tool technical field especially relates to a thermal recovery packer. BACKGROUND

[0002] Thermal recovery packer is needed to seal the annular space between the oil pipe and the casing during the thermal recovery process of the heavy oil well, CN 222276634 U discloses a high-strength sealing anti-dropping righting thermal recovery packer, which utilizes the heat of steam to make the thermal expansion liquid gasify to generate a pushing force to make the vertebral body move into the rubber sleeve, thereby performing setting, however, the technical scheme does not have the function of axially positioning the vertebral body, once the steam temperature drops or during the steam injection, the thermal sensitive medium shrinks in volume, the rubber sleeve will be in the unsetting state, which causes the oil production layer and other layers to be oil or water intermingled, thereby bringing difficulties to the production, meanwhile, the technical scheme sets the sealing ring on the two sides of the thermal expansion liquid as the sealing means, after the thermal expansion liquid gasifies, the gas molecules are small in size, and the sealing effect cannot be guaranteed. SUMMARY

[0003] In order to solve the problem that the current thermal recovery packer cannot seal the stratum for a long time, the utility model provides a thermal recovery packer.

[0004] The technical scheme provided by the utility model is as follows: a thermal recovery packer, which comprises an upper joint, a lower joint and a central pipe, the upper joint is threadedly and sealingly connected to the central pipe at the lower part, the central pipe is threadedly and sealingly connected to the lower joint at the lower part, a rubber sleeve, a vertebral body and a support sleeve are sequentially sleeved on the outer side of the central pipe from top to bottom, an unsetting pin is arranged between the support sleeve and the central pipe, the upper part of the vertebral body is in a conical structure which is contracted, the inner hole of the lower part of the rubber sleeve is a conical hole which is expanded, the upper part of the vertebral body extends into the conical hole of the rubber sleeve, the upper part of the rubber sleeve is on the lower part of the upper joint, and a compression spring is arranged between the vertebral body and the upper joint.

[0005] The outer circle of the vertebral body extends downward by a limiting sleeve, the limiting sleeve is sleeved on the outer side of the support sleeve, the inner hole of the lower part of the limiting sleeve is provided with a ring groove, an elastic ring is arranged in the ring groove, the outer circle of the support sleeve is provided with a limiting groove above the elastic ring, a setting pin is arranged between the limiting sleeve and the support sleeve, the setting pin is located below the elastic ring, a capsule is arranged in the space between the limiting sleeve, the support sleeve and the central pipe, and the capsule is filled with water.

[0006] The space between the limiting sleeve, the support sleeve and the central pipe is provided with a capsule, and the capsule is replaced by: a bearing sleeve is arranged at the lower part of the capsule, a driving piston is arranged at the lower part of the bearing sleeve, the upper part of the driving piston is sleeved on the outer side of the bearing sleeve, the driving piston and the bearing sleeve are connected through a one-way tooth, the one-way tooth enables the driving piston to ascend relative to the bearing sleeve but not to descend, the bearing sleeve is provided with a convex table on the upper side, the convex table is in gap cooperation with the limiting sleeve, and a limiting groove is formed between the top of the driving piston and the convex table of the bearing sleeve.

[0007] The driving piston and the central tube are connected through a sealing ring gap fit, the central tube is provided with a liquid inlet hole below the sealing ring of the driving piston, the lower part of the driving piston is provided with a stepped shaft with an enlarged diameter, the stepped shaft is connected with the supporting sleeve through a sealing ring gap fit, the top of the supporting sleeve is connected with a limiting ring through bolts, and the limiting ring is blocked on the upper part of the stepped shaft.

[0008] The threaded connection part of the central tube and the upper joint and the lower joint is filled with sealing filler.

[0009] The utility model discloses the beneficial effect is: set up the elastic ring between the vertebral body and the supporting sleeve, the steam of high temperature makes the water in the capsule vaporization, and the capsule volume expands and promotes the vertebral body to go up, makes the rubber cylinder expansion packer, and the vertebral body falls into the limiting groove when the vertebral body goes up to the elastic ring, and the vertebral body is limited in the axial direction, and the rubber cylinder packer is reliable, and is not influenced by the temperature of the steam injection, and when the unsealing, the pipe column is lifted, and the unsealing pin is cut, and the axial direction of the supporting sleeve is unsealed, and the vertebral body is lowered under the action of the compression spring, and the rubber cylinder is retracted and unsealed, and the water in the capsule is filled, and there is no sealing problem after the water vaporization, and the working reliability is improved.

[0010] If the sealing effect of the thermal recovery packer is poor when the formation pressure changes, steam may flow to other formations, causing heat loss, and high-pressure pulse pressure is punched into the well, the driving piston goes up under the high-pressure pulse pressure, the driving piston goes up and pushes the elastic ring and the vertebral body, and the expansion degree of the rubber cylinder is increased, so that the sealing effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic diagram of the utility model embodiment 1. Figure 1

[0012] Figure 2 is a structural schematic diagram of the utility model embodiment 2. Figure 2

[0013] Figure 3 is an enlarged view of A of figure 2. Figure 3 Figure 2 Figure 4 is an enlarged view of B of figure 2.

[0014] Figure 5 is a structure schematic diagram of the utility model packer. Figure 4

[0015] Figure 6 is an enlarged view of B of figure 5. Figure 5 Figure 4

[0016] In the drawing, 1 is an upper joint, 2 is a central tube, 3 is a lower joint, 4 is a rubber cylinder, 5 is a vertebral body, 501 is a limiting sleeve, 6 is a capsule, 7 is a supporting sleeve, 8 is an unsealing pin, 9 is an elastic ring, 10 is a packer pin, 11 is a bearing sleeve, 12 is a driving piston, 1201 is a stepped shaft, 13 is a liquid inlet hole, 14 is a limiting ring, 15 is a limiting groove, 16 is a one-way tooth, and 17 is a sealing filler. DETAILED DESCRIPTION ​​​​​​

[0017] The following is combined with Figures 1 to 5 This application is described in further detail.

[0018] Example 1

[0019] Reference Figure 1 A thermal recovery packer includes an upper joint 1, a lower joint 3 and a central pipe 2. The lower part of the upper joint 1 is threadedly sealed and connected to the central pipe 2, and the lower part of the central pipe 2 is threadedly sealed and connected to the lower joint 3. The outer side of the central pipe 2 is covered with a rubber sleeve 4, a cone 5 and a support sleeve 7 in sequence from top to bottom. An unsealing pin 8 is provided between the support sleeve 7 and the central pipe 2. The upper part of the cone 5 is a contracted conical structure, and the inner hole of the lower part of the rubber sleeve 4 is an expanded conical hole. The upper part of the cone 5 extends into the conical hole of the rubber sleeve 4. The upper part of the rubber sleeve 4 presses against the lower part of the upper joint 1. A compression spring is provided between the cone 5 and the upper joint 1.

[0020] A limiting sleeve 501 is extended downward from the outer circle of the vertebral body 5, and the limiting sleeve 501 is sleeved on the outside of the support sleeve 7. An annular groove is provided in the inner hole of the lower part of the limiting sleeve 501, and an elastic ring 9 is provided in the annular groove. A limiting groove 15 is provided on the outer circle of the support sleeve 7 above the elastic ring 9. A sealing pin 10 is provided between the limiting sleeve 501 and the support sleeve 7, and the sealing pin 10 is located below the elastic ring 9. A capsule 6 is provided in the space between the limiting sleeve 501, the support sleeve 7 and the central tube 2, and the capsule 6 is filled with water.

[0021] An elastic ring 9 is set between the vertebral body 5 and the support sleeve 7. When the thermal recovery packer is lowered to the isolation position and steam is injected, the high-temperature steam vaporizes the water in the capsule 6. The volume of the capsule 6 expands and pushes the vertebral body 5. The sealing pin 10 is sheared off, and the vertebral body 5 rises, causing the rubber sleeve 4 to expand and seal. When the vertebral body 5 rises until the elastic ring 9 falls into the limiting groove 15 (the depth of the limiting groove 15 is such that half of the elastic ring 9 extends into the limiting groove 15 and the other half remains in the annular groove of the limiting sleeve 501), the vertebral body 5 is limited in the axial direction, and the rubber sleeve 4 is reliably sealed and is not affected by the temperature of the injected steam. When unsealing, the pipe string is lifted, the unsealing pin 8 is sheared off, and the axial limit of the support sleeve 7 is released (such as Figure 1 , leaving a distance between the support sleeve 7 and the lower joint 3), the vertebral body 5 descends under the action of the compression spring, and the rubber cylinder 4 retracts and unseals;

[0022] The capsule 6 is filled with water, so that there is no sealing problem after the water is vaporized, thereby improving working reliability.

[0023] Example 2

[0024] Reference Figures 2 to 5, the space between the limiting sleeve 501, the supporting sleeve 7 and the central pipe 2 is provided with the capsule 6, replaced by: the lower part of the capsule 6 is provided with the bearing sleeve 11, the lower part of the bearing sleeve 11 is provided with the driving piston 12, the upper part of the driving piston 12 is sleeved outside the bearing sleeve 11, the driving piston 12 and the bearing sleeve 11 are connected through the one-way tooth 16, the one-way tooth 16 enables the driving piston 12 to ascend relative to the bearing sleeve 11 but not to descend, the upper side of the bearing sleeve 11 has a boss which is gap matched with the limiting sleeve 501, the top of the driving piston 12 and the boss of the bearing sleeve 11 form the limiting groove 15;

[0025] The driving piston 12 and the central pipe 2 are connected through the gap matching of the sealing ring, the central pipe 2 is provided with the liquid inlet hole 13 below the sealing ring of the driving piston 12, the lower part of the driving piston 12 is provided with the stepped shaft 1201 with an enlarged diameter, the stepped shaft 1201 and the supporting sleeve 7 are connected through the gap matching of the sealing ring, the top of the supporting sleeve 7 is connected with the limiting ring 14 through the bolt, and the limiting ring 14 is blocked on the upper part of the stepped shaft 1201.

[0026] After setting, if the formation pressure changes and the sealing effect of the thermal recovery packer is poor, steam may appear to other formations, causing heat loss, and high-pressure pulse pressure is punched into the well, the driving piston 12 rises, the driving piston 12 rises against the elastic ring 9 and the vertebral body 5, and the expansion degree of the rubber cylinder 4 is increased, so as to improve the sealing effect, that is, after the packer is set, means can still be taken to improve the sealing effect.

[0027] Example 3

[0028] Reference Figure 1 The threaded connection parts of the central pipe 2, the upper joint 1 and the lower joint 3 are filled with the sealing filler 17 with good heat resistance.

Claims

1. A thermal recovery packer, comprising an upper joint (1), a lower joint (3) and a central pipe (2), characterized in that: The lower part of the upper joint (1) is threadedly connected to the center tube (2), and the lower part of the center tube (2) is threadedly connected to the lower joint (3). The outer side of the center tube (2) is sequentially covered with a rubber tube (4), a cone (5) and a support sleeve (7) from top to bottom. An unsealing pin (8) is provided between the support sleeve (7) and the center tube (2). The upper part of the cone (5) is a contracted conical structure. The inner hole of the lower part of the rubber tube (4) is an expanded conical hole. The upper part of the cone (5) extends into the conical hole of the rubber tube (4). The upper part of the rubber tube (4) is pressed against the lower part of the upper joint (1). A compression spring is provided between the cone (5) and the upper joint (1). A limiting sleeve (501) extends downward from the outer circle of the vertebral body (5), the limiting sleeve (501) is sleeved on the outer side of the support sleeve (7), an annular groove is provided in the inner hole of the lower part of the limiting sleeve (501), an elastic ring (9) is provided in the annular groove, a limiting groove (15) is provided on the outer circle of the support sleeve (7) above the elastic ring (9), a sealing pin (10) is provided between the limiting sleeve (501) and the support sleeve (7), the sealing pin (10) is located below the elastic ring (9), a capsule (6) is provided in the space between the limiting sleeve (501), the support sleeve (7) and the central tube (2), and the capsule (6) is filled with water.

2. A thermal recovery packer according to claim 1, characterized in that: A capsule (6) is provided in the space between the limiting sleeve (501), the supporting sleeve (7) and the central tube (2), and is replaced by: a bearing sleeve (11) is provided at the lower part of the capsule (6), a driving piston (12) is provided at the lower part of the bearing sleeve (11), the upper part of the driving piston (12) is sleeved on the outer side of the bearing sleeve (11), the driving piston (12) and the bearing sleeve (11) are connected by a one-way tooth (16), the one-way tooth (16) enables the driving piston (12) to rise but not fall relative to the bearing sleeve (11), a boss is provided on the upper side of the bearing sleeve (11) and is clearance-matched with the limiting sleeve (501), and a limiting groove (15) is formed between the top of the driving piston (12) and the boss of the bearing sleeve (11); The driving piston (12) and the central tube (2) are connected through a sealing ring clearance fit, the central tube (2) is provided with a liquid inlet hole (13) at a position below the sealing ring of the driving piston (12), the lower part of the driving piston (12) is provided with a stepped shaft (1201) with an enlarged diameter, the stepped shaft (1201) and the support sleeve (7) are connected through a sealing ring clearance fit, the top of the support sleeve (7) is connected to a limiting ring (14) by a bolt, and the limiting ring (14) blocks the upper part of the stepped shaft (1201).

3. The thermal recovery packer according to claim 1, characterized in that: The threaded connection parts between the central tube (2) and the upper joint (1) and the lower joint (3) are filled with sealing fillers (17).

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