CN217270121U

CN217270121U - Thermal recovery packer

Info

Publication number: CN217270121U
Application number: CN202221057987.7U
Authority: CN
Inventors: 廉军; 王军林; 刘洪山; 刘俊杰
Original assignee: Shenyang Huawei Petroleum Machinery Manufacturing Co ltd
Current assignee: Shenyang Huawei Petroleum Machinery Manufacturing Co ltd
Priority date: 2022-05-06
Filing date: 2022-05-06
Publication date: 2022-08-23
Anticipated expiration: 2032-05-06

Abstract

The utility model discloses a thermal recovery packer, which comprises a central tube, wherein the upper end of the central tube is provided with a sealing sleeve mechanism, the sealing sleeve mechanism comprises a sealing rubber sleeve sleeved outside the central tube, the middle part of the central tube is provided with an elastic expansion mechanism which comprises an inner tube, an outer tube is sleeved outside a snap ring of the inner tube, the upper end of the outer cylinder is connected with a conical body which can slide along the central tube, the conical surface of the conical body is provided with a spiral groove, graphite is filled in the spiral groove, the lower end of the outer cylinder is connected with a plug, a pre-compression spring is sleeved on the central tube between the conical body and the upper end face of the snap ring, paraffin which can be melted when being heated is filled in an annular space formed by the lower end surface of the snap ring, the upper end surface of the plug, the outer wall of the inner cylinder body and the inner wall of the outer cylinder, a radial gap for enabling the molten paraffin to overflow into the space where the spring is located is reserved between the cylindrical surface of the snap ring and the inner wall of the outer cylinder. The thermal recovery packer has the advantages of small setting resistance, high setting success rate, high setting speed and easy deblocking.

Description

Thermal recovery packer

Technical Field

The utility model relates to a packer, especially a thermal recovery packer that uses when being used for among the thermal recovery process to the oil reservoir pours into the hot-fluid into in the pit into.

Background

Thermal production packers are used to seal off the annular space between the tubing and the casing during thermal production of heavy oil wells. CN 203296743U discloses a steam packer is annotated to two effect heat-sensitive, this steam packer is annotated to two effect heat-sensitive top connection, center tube and lower clutch are from last to connecting in order down, sealing head threaded connection is on the center tube outer wall, the sealing cover is arranged in between top connection and the sealing head and is installed on the sealing head, the cone is arranged in the seal cover lower extreme and suit on the center tube, the urceolus is connected to the cone outside, the inner tube passes through pin joint to be fixed on the center tube, from last to installing the graphite ring down in the annular space that urceolus and inner tube are constituteed, the spring washer, spring and heat-sensitive medium, the utility model discloses a sealed effectual, the deblocking resistance is little, simple structure, convenient operation safe and reliable, it is poor to have overcome current packer sealed effect, and the deblocking resistance is big not enough. However, in the setting process of the double-acting heat-sensitive steam injection packer, no lubrication exists between the conical body and the sealing sleeve, so that the conical body is relatively large in resistance when being inserted into the sealing sleeve and moving upwards, and the upward power of the conical body is limited by the resilience force of the spring, so that the setting failure is easy to occur, and the setting success rate is not high. In addition, in the starting stage of setting, the sealing sleeve cannot be fully contacted with hot fluid and is difficult to be heated and softened, so that the setting resistance is further increased, and the spring is not favorable for being used as the setting power.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is: the thermal production packer has the advantages of small setting resistance, high setting success rate, high setting speed and easiness in deblocking.

The technical scheme adopted for solving the technical problem is as follows: a packer for thermal recovery is composed of central tube, sealing sleeve mechanism consisting of sealing rubber sleeve outside the central tube, lower joint at lower end of central tube, elastic expanding mechanism consisting of an internal tube fixed to external surface of central tube and consisting of tube body and clamping ring at upper end of tube body, an external tube sleeved outside the clamping ring, a conic body able to slide along central tube, spiral slot on conic surface of conic body and filled with graphite, and a plug able to slide along external surface of internal tube, a pre-pressing spring is sleeved on the central tube between the conical body and the upper end face of the clamping ring, paraffin which can be melted when heated is filled in an annular space formed by the lower end face of the clamping ring, the upper end face of the plug, the outer wall of the inner cylinder body and the inner wall of the outer cylinder, and a radial gap for enabling the melted paraffin to overflow into a space where the spring is located is reserved between the cylindrical surface of the clamping ring and the inner wall of the outer cylinder.

As a further improvement of the utility model: the conical surface of the conical body is provided with a multi-head spiral groove, and the graphite filled in the spiral groove is 0.1-0.2 mm higher than the conical surface.

As a further improvement of the utility model: the sealing sleeve mechanism further comprises an upper connector connected to the upper end of the central pipe and a sealing head installed on the central pipe, an outer sleeve integrated with the upper connector is arranged at the lower end of the upper connector, the upper end of the sealing rubber sleeve is embedded in an annular space between the outer sleeve and the sealing head, the distance from the lower end face of the sealing head to the lower end face of the sealing rubber sleeve is larger than the distance from the lower end face of the clamping ring to the upper end face of the plug, and the inner diameter of the lower end of the sealing rubber sleeve is larger than the outer diameter of the upper end of the conical body.

As a further improvement of the utility model: the wall of the central tube between the lower end surface of the sealing head and the upper end of the conical body is provided with a heat conduction hole which enables hot fluid in the central tube to reach an annular space between the sealing rubber sleeve and the central tube.

As a further improvement of the utility model: and the lower end of the conical body is provided with a sealing ring which is in sliding sealing fit with the outer wall of the central tube.

As a further improvement scheme of the utility model: and a spring pressing ring is arranged between the lower end face of the conical body and the spring.

As a further improvement of the utility model: the pipe body of the inner cylinder is provided with a jackscrew which enables the inner cylinder to be fixed on the central pipe.

As a further improvement of the utility model: the wall of the outer cylinder is provided with an exhaust hole.

As a further improvement of the utility model: the upper joint, the sealing head and the lower joint are in threaded connection with the central pipe, the conical body and the plug are in threaded connection with the outer barrel, and the anti-degumming agent is filled in the threaded gap of the threaded connection part.

As a further improvement of the utility model: the outer sleeve is a stepped reducer with a straight outer pipe wall, a large inner diameter upper section and a small inner diameter lower section, and a plurality of annular saw grooves are formed in the lower end of the lower section of the outer sleeve.

Has the advantages that: the utility model discloses a thermal production packer, because it has opened the helicla flute on the conical surface of conical body to have adopted, it has graphite to pack in the helicla flute, it has a plug that can follow the internal cylinder body outer wall gliding to connect to have one at the lower extreme of outer cylinder, it has precompressed spring to overlap on the center tube between conical body and snap ring up end, the annular space that terminal surface under the snap ring, plug up end, internal cylinder body outer wall and urceolus inner wall constitute is filled with and meets heat can molten paraffin, leave the technical characterstic that makes molten paraffin overflow into the radial clearance in the space that the spring was located between snap ring cylinder and urceolus inner wall, pour into the hot-fluid into in the pit from ground during the seat seal, paraffin melts after being heated, overflows, make the spring kick-back, the conical body slides upward and expands the sealing gum cover and opens, the graphite that the helicla flute of conical surface is filled can produce lubricated effect at sealing gum cover and conical body surface, therefore, the upward resistance of the conical body is reduced, so that the conical body can move more smoothly, the sealing rubber sleeve is easier to expand, the success rate of setting is improved, and the time required by setting is shortened. In addition, when carrying the tubular column on and carrying out the deblocking, the resistance that the conical body glided is also little, makes the utility model discloses a thermal recovery packer changes in the deblocking. Because adopted seal cover mechanism still including connect the top connection of center tube upper end and through the sealed head of threaded fixation on the center tube, the lower extreme of top connection is equipped with the outer tube integrative with the top connection, the upper end of sealed gum cover inlays the dress in the ring channel between outer tube and sealed head, the distance of terminal surface to sealed gum cover lower terminal surface under the sealed head is greater than the distance of terminal surface to plug up end under the snap ring, the internal diameter of sealed gum cover lower extreme is greater than the technical characterstic of the external diameter of cone body upper end, make the equipment of thermal recovery packer more convenient, and the cone body has sufficient stroke, sealed gum cover can be fully expanded, the effect of packing the oil jacket annular space is better. The technical characteristic that the heat conduction hole which enables the hot fluid in the central tube to reach the annular space between the sealing rubber sleeve and the central tube is formed in the wall of the central tube between the lower end face of the sealing head and the upper end of the conical body is adopted, so that the hot fluid in the central tube can be in full contact with the sealing rubber sleeve to heat the sealing rubber sleeve at the initial setting stage, the sealing rubber sleeve is softened, and the conical body can be expanded easily. Due to the technical characteristics that the sealing ring which is in sliding sealing fit with the outer wall of the central pipe is arranged at the lower end of the conical body and the spring pressing ring is arranged between the lower end face of the conical body and the spring, the phenomenon that molten paraffin or other impurities enter a gap between the conical body and the central pipe to increase the sliding resistance of the conical body or clamp the conical body can be avoided, and the reliability of equipment is improved. Because the jackscrew which enables the inner barrel to be fixed on the central tube is arranged on the tube body of the inner barrel, the inner barrel can be stably fixed on the outer wall of the central tube, and the inner barrel is prevented from sliding on the outer wall of the central tube to cause the change of the parameters of the spring. Because the technical characteristic that the wall of the outer cylinder is provided with the exhaust hole is adopted, a closed chamber is prevented from being formed in an annular space between the outer cylinder and the central tube to block the spring to release elasticity. Because the upper joint, the sealing head and the lower joint are connected with the central pipe through threads, the conical body, the plug and the outer barrel are connected through threads, and the technical characteristic of degumming prevention is filled in the thread clearance of the thread connecting part, all parts of the thermal recovery packer are connected more firmly, and the thermal recovery packer is effectively prevented from working in a high-temperature environment for a long time to cause the thread connecting part to be loosened. Because the outer tube that has adopted the top connection is the step reducing pipe that the upper segment internal diameter is big, the hypomere internal diameter is little, opens the technical characterstic that has a plurality of ring array's saw groove at the lower extreme of outer tube hypomere, makes the outer tube can from the bottom up gently warp after the sealed gum cover expansion, prevents that the outer tube rapid deformation from and easy fracture, has guaranteed the pressure-bearing effect of outer tube, makes the utility model discloses a thermal recovery packer is better to the packing effect of oil jacket annular space.

Drawings

The thermal production packer of the present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is an axial cross-sectional view of the thermal packer of the present invention;

figure 2 is a radial cross-sectional view of the cone in the thermal packer of the present invention.

Detailed Description

As shown in figure 1, the utility model discloses a thermal recovery packer includes center tube 1, is equipped with seal cover mechanism 2 in the upper end of center tube, is equipped with elasticity expanding mechanism 3 in the middle part of center tube, is equipped with lower clutch 4 at the lower extreme of center tube.

The sealing sleeve mechanism comprises a sealing rubber sleeve 23 sleeved outside the central tube, the sealing sleeve mechanism further comprises an upper joint 21 connected to the upper end of the central tube and a sealing head 22 fixed on the central tube through threads, an outer sleeve 211 integrated with the upper joint is arranged at the lower end of the upper joint, the outer sleeve is a stepped reducer pipe with a straight outer pipe wall, a large inner diameter at the upper section and a small inner diameter at the lower section, so that the pipe wall of the outer sleeve is changed from top to bottom through thickness reduction, and a plurality of annular array saw grooves are formed at the lower end of the lower section of the outer sleeve. The upper end of the sealing rubber sleeve is embedded in an annular space between the outer sleeve and the sealing head.

The elastic expansion mechanism is arranged in the middle of the central tube and comprises an inner tube 37 fixed on the outer wall of the central tube, the inner tube comprises a tube body 372 and a clamping ring 371 arranged at the upper end of the tube body, a jackscrew 12 used for fixing the inner tube on the central tube is arranged on the tube body of the inner tube, an outer tube 34 is sleeved outside the clamping ring, an exhaust hole 36 is arranged on the tube wall of the outer tube, a conical body 31 capable of sliding along the central tube is connected at the upper end of the outer tube, a sealing ring 32 in sliding sealing fit with the outer wall of the central tube is arranged at the lower end of the conical body, a plug 39 capable of sliding along the outer wall of the inner tube body is connected at the lower end of the outer tube, a pre-compression spring 35 is sleeved on the central tube between the conical body and the upper end face of the clamping ring, a spring compression ring 33 is arranged between the lower end face of the conical body and the spring, paraffin 38 capable of melting under heat is filled in an annular space formed by the lower end face of the clamping ring, the upper end face of the plug, the outer wall of the inner tube body and the inner wall of the outer tube, and a radial gap for enabling the molten paraffin to overflow into the space where the spring is located is reserved between the cylindrical surface of the snap ring and the inner wall of the outer barrel. After the elastic expanding mechanism is heated, the conical body enters an annular space between the sealing rubber sleeve and the central pipe from bottom to top, so that the sealing rubber sleeve is expanded into a horn shape, and the annular space between the oil pipe and the casing pipe is plugged.

The distance from the lower end face of the sealing head to the lower end face of the sealing rubber sleeve is larger than the distance from the lower end face of the clamping ring to the upper end face of the plug, the inner diameter of the lower end of the sealing rubber sleeve is larger than the outer diameter of the upper end of the conical body, and a heat conduction hole 11 enabling hot fluid in the central pipe to reach an annular space between the sealing rubber sleeve and the central pipe is formed in the pipe wall of the central pipe between the lower end face of the sealing head and the upper end of the conical body.

Preferably, as shown in fig. 2, a spiral groove 311 is formed on the conical surface of the conical body, graphite 312 is filled in the spiral groove, and further preferably, a multi-head spiral groove is formed on the conical surface of the conical body, so that the lubricating effect of the conical surface and the sealing rubber sleeve can be ensured, the helix angle of the spiral groove can be increased, the sealing rubber sleeve and the edge of the spiral groove can be prevented from being seized, and the graphite filled in the spiral groove is preferably 0.1-0.2 mm higher than the conical surface, so that the lubricating effect can be further improved.

The utility model discloses an upper joint, sealed head, lower clutch pass through threaded connection with the center tube in the packer is adopted to heat, and conical body, plug pass through threaded connection with the urceolus, and it comes unstuck to pack to have the prevention in threaded clearance of threaded connection portion.

The utility model discloses a when thermal recovery packer uses, upper and lower both ends are connected with oil pipe or hot-fluid injection pipe respectively, and transfer the oil well assigned position, pass through oil pipe or hot-fluid injection pipe by ground and pour into the hot-fluid into the pit, after the hot-fluid got into the center tube of thermal recovery packer, heat thermal recovery packer, after the thermal recovery packer is heated, the sealed gum cover softens, paraffin melts, overflow from the space of place after paraffin melts, go upward for the plug and provide the space, the plug, the urceolus, the conical body begins upwards to slide under the effect of spring, the conical body inserts between sealed gum cover and the center tube by sealed gum cover lower extreme, expand the sealed gum cover, the conical body is with the in-process of sealed gum cover contact, the graphite of helicla flute is lubricated the contact surface of conical body and sealed gum cover, thereby reduce the resistance of conical body going upward, ensure that the gum cover can be expanded, And the oil sleeve annulus is sealed, when the sealing rubber sleeve is in contact with the inner wall of the sleeve and the oil sleeve annulus is blocked, pressure difference is formed between the upper side and the lower side of the sealing rubber sleeve by hot fluid, the sealing rubber sleeve is further expanded by the pressure difference and is fully contacted with the inner wall of the sleeve, and finally the setting effect is achieved to seal the oil sleeve annulus. The utility model discloses a only need stop to pour into the hot-fluid into in the pit, lift the deblocking that the tubular column just can realize the thermal recovery packer before the thermal recovery packer cools off completely during the thermal recovery packer deblocking.

Claims

1. The utility model provides a thermal recovery packer, includes the center tube, is equipped with seal cover mechanism in the upper end of center tube, seal cover mechanism includes the sealed gum cover of suit in the center tube outside, is equipped with the lower clutch at the lower extreme of center tube, is equipped with the annular space that gets into between sealed gum cover and the center tube from bottom to top after being heated at the middle part of center tube, makes the elasticity expanding mechanism of sealed gum cover expansion horn shape, annular space shutoff between with oil pipe and the sleeve pipe, characterized by: the elastic expansion mechanism comprises an inner cylinder fixed on the outer wall of a central tube, the inner cylinder comprises a tube body and a clamping ring at the upper end of the tube body, an outer cylinder is sleeved outside the clamping ring, a conical body capable of sliding along the central tube is connected to the upper end of the outer cylinder, a spiral groove is formed in the conical surface of the conical body, graphite is filled in the spiral groove, a plug capable of sliding along the outer wall of the inner cylinder tube is connected to the lower end of the outer cylinder, a pre-compression spring is sleeved on the central tube between the conical body and the upper end face of the clamping ring, paraffin capable of being melted under heat is filled in an annular space formed by the lower end face of the clamping ring, the upper end face of the plug, the outer wall of the inner cylinder tube and the inner wall of the outer cylinder, and a radial gap for enabling the melted paraffin to overflow into the space where the spring is located is reserved between a cylindrical clamping ring and the inner wall of the outer cylinder.

2. The thermal packer of claim 1, wherein: the conical surface of the conical body is provided with a multi-head spiral groove, and the graphite filled in the spiral groove is 0.1-0.2 mm higher than the conical surface.

3. A thermal production packer according to claim 1 or 2, characterised in that: the sealing sleeve mechanism further comprises an upper connector connected to the upper end of the central pipe and a sealing head installed on the central pipe, an outer sleeve integrated with the upper connector is arranged at the lower end of the upper connector, the upper end of the sealing rubber sleeve is embedded in an annular space between the outer sleeve and the sealing head, the distance from the lower end face of the sealing head to the lower end face of the sealing rubber sleeve is larger than the distance from the lower end face of the clamping ring to the upper end face of the plug, and the inner diameter of the lower end of the sealing rubber sleeve is larger than the outer diameter of the upper end of the conical body.

4. The thermal packer of claim 3, wherein: the wall of the central tube between the lower end surface of the sealing head and the upper end of the conical body is provided with a heat conduction hole which enables hot fluid in the central tube to reach an annular space between the sealing rubber sleeve and the central tube.

5. The thermal recovery packer of claim 4, wherein: and the lower end of the conical body is provided with a sealing ring which is in sliding sealing fit with the outer wall of the central tube.

6. The thermal recovery packer of claim 5, wherein: and a spring pressing ring is arranged between the lower end face of the conical body and the spring.

7. The thermal packer of claim 3, wherein: the pipe body of the inner cylinder is provided with a jackscrew which enables the inner cylinder to be fixed on the central pipe.

8. The thermal packer of claim 3, wherein: the wall of the outer cylinder is provided with an exhaust hole.

9. The thermal packer of claim 6, wherein: the upper joint, the sealing head and the lower joint are in threaded connection with the central pipe, the conical body, the plug and the outer barrel are in threaded connection, and the thread clearance of the threaded connection part is filled with degumming prevention.

10. The thermal recovery packer of claim 3, wherein: the outer sleeve is a stepped reducer with a straight outer pipe wall, a large inner diameter upper section and a small inner diameter lower section, and a plurality of annular saw grooves are formed in the lower end of the lower section of the outer sleeve.