CN211974934U - Casing heat insulation device for thickened oil thermal production well - Google Patents

Abstract

A casing pipe heat-insulating device for heavy oil thermal production well is characterized in that an upper joint is sleeved on the upper portion of an inner pipe, an upper sealing ring is arranged between the inner pipe and the upper joint, a rectangular window is arranged on the upper joint, an annular locking block groove on the inner pipe is arranged below the upper sealing ring, a locking block is arranged in the rectangular window on the upper joint, the inner wall of the locking block is arranged in the annular locking block groove on the inner pipe, the lower outer portion of a steel core and the upper portion of a rubber cylinder are vulcanized into a whole, a rubber cylinder seat is sleeved outside the upper joint, the inner wall of the rubber cylinder seat covers the locking block, a release section is arranged in the rubber cylinder seat, the rubber cylinder seat is connected to the upper joint through a deblocking pin, the rubber cylinder is sleeved on the inner pipe, the upper portion of the rubber cylinder is placed into the lower portion of the rubber cylinder seat, a steel core is connected with the rubber cylinder seat, a lower sealing ring is arranged between the inner pipe and the steel core, an inner sealing ring and an outer sealing, the lower joint is connected with the inner pipe, the upper part of the upper joint is externally provided with an anti-collision sleeve, and the self-fluxing material is cast through the pressure transmission hole.

Description

Casing heat insulation device for thickened oil thermal production well

Technical Field

The utility model relates to a downhole device that oil field viscous crude well steam injection heat adopted is a sleeve pipe heat-proof device that viscous crude thermal recovery well was used.

Background

When the steam is injected into the thermal production well of the heavy oil well in the oil field, the injected steam pressure is required to be high, the temperature is high, and the heat loss is less when the steam reaches the stratum from the well mouth. In order to achieve the purpose of little heat loss, a high-temperature and high-pressure resistant packer is generally arranged on a steam injection pipe column injected into the stratum, so that steam does not flow into a casing pipe to cause heat loss. The existing heavy oil well has more types of packers for steam injection, the packer is deformed by heat-sensitive metal after being heated so as to expand a rubber sleeve to seal the sleeve, and a tubular column can be lifted after the well temperature is reduced after steam injection. However, at present, because the temperature in the well is slowly reduced, the tubular column is required to be lifted frequently without reducing the temperature in the well, and the tubular column is easy to clamp when the packer is not released, so that the tubular column cannot be lifted for overhaul, and great economic loss is caused.

Disclosure of Invention

The utility model aims at designing a sleeve pipe heat-proof device that viscous crude thermal production well was used, overcoming the problem that current heat-sensitive packer exists, deblocking when making it carry the tubular column prevents the card tubular column, causes the traffic heavy construction when avoiding the oil well to carry the tubular column, reduces economic loss.

The purpose of the utility model is realized like this: the rubber tube sealing device comprises an upper joint, an unsealing pin, an upper sealing ring, a locking block, a rubber tube seat, a steel core, a lower sealing ring, a rubber tube, an inner tube, a piston, an inner sealing ring, an outer sealing ring and a lower joint, wherein the upper joint is sleeved on the upper part of the inner tube from the lower part of the inner tube upwards, the upper sealing ring is arranged between the upper part of the inner tube and the inner part of the upper joint, the outer diameter of the upper part of the inner tube is larger than the inner diameter of the lower part of the upper joint, a rectangular window is arranged on the upper joint, an annular locking block groove is arranged on the inner tube, the upper end and the lower end of the annular locking block groove are conical, the annular locking block groove on the inner tube corresponds to the rectangular window on the upper joint, the locking block is arranged in the rectangular window on the upper joint, the arc-shaped inner wall of the locking block is arranged in the annular locking block groove on the inner tube, conical surfaces matched with the upper end, the rubber cylinder seat is sleeved outside the upper joint, the inner wall of the rubber cylinder seat covers the locking block, so that the locking block cannot retreat from an annular locking block groove on the inner pipe, a release section is arranged in the rubber cylinder seat, the release section is positioned above the locking block, the upper part of the rubber cylinder seat is connected to the upper joint through a deblocking pin, the lower part of the rubber cylinder seat is a horn hole, the upper part of the rubber cylinder is a cone, the steel core and the rubber cylinder are vulcanized into a whole and sleeved on the inner pipe, the upper cone of the rubber cylinder is placed into the horn hole in the lower part of the rubber cylinder seat, the upper part of the steel core is connected with the rubber cylinder seat, a lower sealing ring is arranged between the steel core and the inner pipe, an inner sealing ring is arranged in the lower part of the piston, an outer sealing ring is arranged outside the lower part of the piston, the outer sealing ring seals a gap between the outer wall of the piston and the inner wall of the upper part of the lower joint, a pressure transfer hole is arranged on the lower external, the sliding section is positioned on the pressure transmission hole, the upper end of the sliding section is a shoulder, the diameter of the sliding section is smaller than that of the shoulder, an internal thread in the middle of the lower joint is connected with an external thread on the lower part of the inner tube, the inner wall of the piston is matched with the sliding section, the inner shoulder of the piston is limited to the shoulder on the upper end of the sliding section, the inner sealing ring is positioned on the pressure transmission hole, the inner sealing ring seals a gap between the inner wall of the piston and the sliding section, the cone is inserted into the lower part of the rubber cylinder, the piston can move upwards to expand the rubber cylinder to form a sealing sleeve, the sliding distance of the piston on the sliding section is greater than the upward distance required by the rubber cylinder to expand the sealing sleeve by the upward movement of the piston by 5-8mm, the upper part of the upper joint is externally provided with an anti-collision sleeve, the outer diameter of the anti-collision sleeve is equal to or greater than the outer diameter of the, the cast self-fluxing matter is filled in an annular cavity between the bottom of the pressure transmission hole and the piston and the inner shoulder of the lower joint, and the melting temperature of the self-fluxing matter is 100 ︒ -200 ︒ C.

The utility model has the advantages that: when steam is injected, steam temperature enables self-fluxing matters to be dissolved, steam pressure is transmitted to the lower portion of the piston through the pressure transmission hole, the piston is pushed to move upwards, the cone on the upper portion of the piston enables the rubber cylinder to expand the sealing sleeve, injected steam enters a stratum, the purpose of preventing heat loss is achieved, when next workover operation needs to be carried out, the friction force between the rubber cylinder and the sleeve enables the deblocking pin to be cut off, the upper joint moves upwards, the locking block reaches the rubber cylinder seat, the releasing section is located, the locking block exits from the annular locking block groove on the inner pipe, relative displacement can be achieved between the upper joint and the inner pipe, the inner pipe moves downwards relative to the upper joint, the cone on the upper portion of the piston exits from the rubber cylinder, the rubber cylinder is retracted, deblocking is achieved, the utility model discloses can be smoothly carried out, the pipe column cannot be clamped, the problem of overhaul does.

Drawings

Fig. 1 is an assembly view of an embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The embodiment of the utility model comprises an upper joint 1, an anti-collision sleeve 2, an unsealing pin 3, an upper sealing ring 4, a locking block 5, a rubber sleeve seat 6, a steel core 7, a lower sealing ring 8, a rubber sleeve 9, an inner tube 10, a piston 11, an inner sealing ring 12, an outer sealing ring 13 and a lower joint 14, wherein the upper joint 1 is sleeved on the upper part of the inner tube 10 from the lower part of the inner tube 10 upwards, the upper sealing ring 4 is arranged between the upper part of the inner tube 10 and the inside of the upper joint 1, the outer diameter of the upper part of the inner tube 10 is larger than the inner diameter of the lower part of the upper joint 1, the upper joint 1 is provided with a rectangular window, the inner tube 10 is provided with an annular locking block groove, the upper end and the lower end of the annular locking block groove are conical, the annular locking block groove on the inner tube 10 corresponds to the rectangular window on the upper joint 1, the annular locking block groove on the inner tube 10 is positioned below the upper sealing ring, the two ends of the arc inner wall of the locking block 5 are provided with conical surfaces which are matched with the conical surfaces at the upper end and the lower end of an annular locking block groove on the inner tube 10, the lower outer part of a steel core 7 is vulcanized with the upper part of a rubber cylinder 9 into a whole, a rubber cylinder seat 6 is sleeved outside an upper joint 1, the inner wall of the rubber cylinder seat 6 covers the locking block 5, so that the locking block 5 cannot retreat from the annular locking block groove on the inner tube 10, a release section 6-1 is arranged in the rubber cylinder seat 6, the release section 6-1 is positioned above the locking block 5, the upper part of the rubber cylinder seat 6 is connected on the upper joint 1 through a deblocking pin 3, the lower part of the rubber cylinder seat 6 is a horn hole, the upper part of the rubber cylinder 9 is a cone, the steel core 7 and the rubber cylinder 9 are sleeved on the inner tube 10 after being vulcanized into a whole, the upper cone of the rubber cylinder 9 is placed in the horn hole at the lower part of the rubber cylinder seat 6, the upper part of the rubber cylinder seat 7 is connected with the rubber cylinder seat, an outer sealing ring 13 is arranged outside the lower part of a piston 11, the piston 11 is arranged in the upper part of a lower joint 14, the outer sealing ring 13 seals a gap between the outer wall of the piston 11 and the inner wall of the upper part of the lower joint 14, the upper part of the piston 11 is a cone 11-1, a pressure transfer hole 10-2 is arranged on the outer thread of the lower part of an inner pipe 10, a sliding section 10-1 is arranged on the lower part of the inner pipe 10, the sliding section 10-1 is positioned above the pressure transfer hole 10-2, the upper end of the sliding section 10-1 is a shoulder, the diameter of the sliding section 10-1 is smaller than that of the shoulder, the inner thread in the middle part of the lower joint 14 is connected with the outer thread of the lower part of the inner pipe 10, the inner wall of the piston 11 is matched with the sliding section 10-1, and the inner shoulder of the piston 11 is limited to, the inner sealing ring 12 is positioned above the pressure transfer hole 10-2, the inner sealing ring 12 seals the gap between the inner wall of the piston 11 and the sliding section 10-1, the cone 11-1 is inserted into the lower part of the rubber cylinder 9, the piston 11 moves upwards to enable the rubber cylinder 9 to expand the sealing sleeve, the sliding distance of the piston 11 on the sliding section 10-1 is larger than the upward distance required by the piston 11 to enable the rubber cylinder 9 to expand the sealing sleeve by 5-8mm, the anti-collision sleeve 2 is arranged outside the upper part of the upper joint 1, the outer diameter of the anti-collision sleeve 2 is equal to or larger than the outer diameter of the rubber cylinder 9, a self-melting object is cast through the pressure transmitting hole 10-2, the cast self-melting object is filled in an annular cavity between the bottom of the pressure transmitting hole 10-2 and the piston 11 and the inner shoulder of the lower joint 14, and the melting temperature of the self-melting object is 100 ︒ -200 ︒ C.

The utility model discloses in the well of steam need be annotated down, be in the upper portion in ground room, well temperature is less than the temperature from the melt during the time of going into the well, and the melt can not melt, and piston 11 can not remove, and the packing element can not move, guarantees that it is intact to go into the well. When steam is injected, the steam temperature melts the self-fluxing matter (the steam temperature is more than 300 ︒ C), the steam pressure is transmitted to the lower part of the piston 11 through the pressure transmitting hole 10-2 to push the piston 11 to go upwards, the cone 11-1 on the upper part of the piston 11 enables the rubber cylinder 9 to expand the sealing sleeve and isolate the sleeve into two systems, when steam is injected, the injected steam enters the stratum and cannot reach the sleeve above the utility model to achieve the purpose of preventing heat loss, when next workover operation needs to be proposed, the friction force between the rubber cylinder 9 and the sleeve enables the deblocking pin 3 to be cut off, the upper joint 1 goes upwards to enable the locking block 5 to reach the release section 6-1 on the rubber cylinder seat 6, the locking block 5 withdraws from the annular locking block groove on the inner pipe 10, the upper joint 1 and the inner pipe 10 can relatively move, the inner pipe 10 moves downwards relative to the upper joint 1 to enable the cone on the upper part of the piston 11 to withdraw from the rubber cylinder 9, the packing element 9 is withdrawed to realize the deblocking, the utility model discloses just can propose smoothly.

Claims (1)

1. The utility model provides a sleeve pipe heat-proof device that viscous crude thermal recovery well was used, includes top connection (1), prevents bumping cover (2), deblocking pin (3), upper seal circle (4), locking piece (5), packing element seat (6), steel core (7), lower seal circle (8), packing element (9), inner tube (10), piston (11), inner seal circle (12), outer sealing washer (13), lower clutch (14), characterized by: the upper joint (1) is sleeved on the upper part of the inner pipe (10) from the lower part of the inner pipe (10) upwards, an upper sealing ring (4) is arranged between the upper part of the inner pipe (10) and the inner part of the upper joint (1), the outer diameter of the upper part of the inner pipe (10) is larger than the inner diameter of the lower part of the upper joint (1), a rectangular window is arranged on the upper joint (1), an annular locking block groove is arranged on the inner pipe (10), the upper end and the lower end of the annular locking block groove are conical, the annular locking block groove on the inner pipe (10) corresponds to the rectangular window on the upper joint (1), the annular locking block groove on the inner pipe (10) is arranged below the upper sealing ring (4), a locking block (5) is arranged in the rectangular window on the upper joint (1), the circular-arc-shaped inner wall of the locking block (5) is arranged in the annular locking block groove on the inner pipe (10), conical surfaces matched with the conical surfaces at the upper, the lower outer part of a steel core (7) and the upper part of a rubber cylinder (9) are vulcanized into a whole, a rubber cylinder seat (6) is sleeved outside an upper connector (1), the inner wall of the rubber cylinder seat (6) covers a locking block (5) to ensure that the locking block (5) cannot retreat from an annular locking block groove on an inner tube (10), a release section (6-1) is arranged in the rubber cylinder seat (6), the release section (6-1) is positioned on the locking block (5), the upper part of the rubber cylinder seat (6) is connected onto the upper connector (1) through a deblocking pin (3), the lower part of the rubber cylinder seat (6) is a horn hole, the upper part of the rubber cylinder (9) is a cone, the inner tube (10) is sleeved on the inner tube (7) after the steel core (7) and the rubber cylinder (9) are vulcanized into a whole, the upper cone of the rubber cylinder (9) is placed into the horn hole at the lower part of the rubber cylinder seat (6), the upper part of the steel core (7) is connected with the rubber cylinder seat (6), a lower sealing ring (8) is arranged between the steel core, an inner sealing ring (12) is arranged in the lower part of a piston (11), an outer sealing ring (13) is arranged outside the lower part of the piston (11), the piston (11) is arranged in the upper part of a lower joint (14), the outer sealing ring (13) seals a gap between the outer wall of the piston (11) and the inner wall of the upper part of the lower joint (14), the upper part of the piston (11) is a cone (11-1), a pressure transfer hole (10-2) is arranged on the external thread of the lower part of an inner pipe (10), a sliding section (10-1) is arranged on the lower part of the inner pipe (10), the sliding section (10-1) is positioned on the pressure transfer hole (10-2), the upper end of the sliding section (10-1) is a shoulder, the diameter of the sliding section (10-1) is smaller than that of the shoulder, and the internal thread in the middle part of the lower joint (14) is connected with the external thread of the lower, the inner wall of the piston (11) is matched with the sliding section (10-1), the inner shoulder of the piston (11) is limited to the upper end shoulder of the sliding section (10-1), the inner sealing ring (12) is positioned above the pressure transmission hole (10-2), the inner sealing ring (12) seals a gap between the inner wall of the piston (11) and the sliding section (10-1), the cone (11-1) is inserted into the lower part of the rubber sleeve (9), the piston (11) moves upwards to enable the rubber sleeve (9) to expand the sealing sleeve, the sliding distance of the piston (11) on the sliding section (10-1) is greater than the upward distance required by the piston (11) to enable the rubber sleeve (9) to expand the sealing sleeve by 5-8mm, the anti-collision sleeve (2) is installed outside the upper part of the upper joint (1), and the outer diameter of the anti-collision sleeve (2) is equal to or greater than the outer diameter of the rubber sleeve (9), and (3) casting a self-melting substance through the pressure transfer hole (10-2), wherein the cast self-melting substance is filled in an annular cavity between the bottom of the pressure transfer hole (10-2) and the piston (11) and the inner shoulder of the lower joint (14), and the melting temperature of the self-melting substance is 100 ︒ -200 ︒ C.

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