CN114482906B - Packer - Google Patents
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- Publication number
- CN114482906B CN114482906B CN202210114232.4A CN202210114232A CN114482906B CN 114482906 B CN114482906 B CN 114482906B CN 202210114232 A CN202210114232 A CN 202210114232A CN 114482906 B CN114482906 B CN 114482906B
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- Prior art keywords
- sealing
- support
- boss
- spherical
- rod
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- 238000012856 packing Methods 0.000 claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 187
- 239000012530 fluid Substances 0.000 claims description 42
- 238000002347 injection Methods 0.000 claims description 29
- 239000007924 injection Substances 0.000 claims description 29
- 238000003466 welding Methods 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000003921 oil Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 239000004058 oil shale Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
The invention provides a packer, which comprises a packing support, a guide support and a reinforcing support, wherein the reinforcing support is welded with the lower part of the packing support, and the lower part of the guide support is welded with the packing support.
Description
Technical Field
The invention belongs to the technical field of oil and gas resource development, and particularly relates to a packer.
Background
With the increase of the difficulty of oil and gas exploitation, a large number of ultra-deep wells and thermal recovery wells appear in domestic oil and gas exploitation. In addition, development of rich oil coal, oil shale, heavy oil and thick oil is becoming a new growth point of oil gas yield, in the prior art, when the oil gas resource is developed, rubber packers and metal packers are mostly adopted as setting components, and the rubber packers are used for realizing setting by filling pressure into rubber barrels to expand rubber and contact with the inner wall of a shaft; the pressure in the rubber cylinder is reduced, the rubber cylinder is contracted, and deblocking is realized; the metal packer is used for realizing setting and deblocking through metal with larger expansibility, and in the underground in-situ pyrolysis oil extraction process of the oil-rich coal and the oil shale, the rock stratum needs to be heated, so that heat is prevented from being transferred in a heat injection well in a disordered manner, and the packer is required to restrict high-temperature fluid in the heat injection well to a limited space at the bottom of the heat injection well. When unconventional oil and gas resources such as rich oil coal, oil shale and the like are mined, the heat injection well is about 600 ℃; a high-temperature and high-pressure environment of more than 5Mpa, wherein the temperature resistance limit of the packer in the prior art is 360 ℃, and the defect that the metal packer is not resistant to high temperature and high pressure and has poor setting effect exists; when the downhole heater is replaced, after the existing packer is unsealed, high-temperature fluid of the stratum can flow back to the heat injection well, so that the stratum is filled with underground water, and the stratum heating efficiency is reduced.
Disclosure of Invention
Aiming at the background art, the invention provides a packer, which solves the defects of poor high temperature and high pressure resistance and poor setting effect of a metal packer in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the packer comprises a packing support, a guiding support and a reinforcing support, wherein the reinforcing support is welded with the lower part of the packing support, the lower part of the guiding support is welded with the packing support, and the packing support comprises any one of the following structures:
A. the lower part of the guide support is provided with a spherical groove A which is in sealing connection with a spherical bulge at the lower part of the heater, the upper part of the sealing support is provided with a fluid flow channel and a spherical groove II which are connected with a sealing boss, and a middle cavity arranged at the middle part of the sealing support is internally provided with the sealing boss and a limiting stop rod; the limiting baffle is fixed at the lower part of the sealing support, the sealing rod is placed in a cavity in the middle of the sealing support, annular uniformly distributed sealing rod through holes are formed in the upper part of the sealing rod, the middle part of the sealing rod is a smooth round rod, and the lower part of the sealing rod is connected with the sealing boss;
in the technical scheme, the upper part of the limit baffle is symmetrically provided with a pair of limit baffle rods, and the limit baffle is welded with the limit baffle rods; the middle part of the limit baffle is provided with a flow passage through hole.
In the above technical scheme, in structure A or structure B, limit baffle sets up 4 annular equipartition's baffle through-holes, seals and separates the screw hole that separates the support lower part and set up 4 annular equipartitions, limit baffle passes through bolted connection with sealing and separating the support.
In the technical scheme, the upper half part of the sealing boss is spherical, a threaded hole used for being connected with the sealing rod is formed in the top of the sealing boss, a pair of limiting through holes used for penetrating through the limiting stop rod are formed in the lower part of the sealing boss, and the limiting through holes are symmetrically distributed.
B. The upper part of the sealing support is provided with a first spherical groove which is connected with a spherical bulge at the lower part of the heater, a sealing joint is formed, a cavity at the middle part of a fluid channel is formed at the lower part of the spherical groove, a third spherical groove is formed at the lower part of the cavity at the middle part, the third spherical groove is connected with a sealing boss, the lower part of the sealing support is connected with a limit baffle through a bolt, a pair of symmetrically distributed limit baffle rods are arranged at the upper part of the limit baffle, and the limit baffle is welded with the limit baffle rods; the middle part of the limit baffle is provided with a flow passage through hole, the limit baffle rod is in an inverted trapezoid shape, the spherical groove III at the lower part of the seal baffle support is connected with the seal boss, the spherical seal boss at the upper part is embedded in the spherical groove III, the lower part of the seal boss is provided with a pair of symmetrically distributed limit through holes for passing through the limit baffle rod, the high-temperature resistant spring is arranged at the lower part of the seal boss, and the limit baffle rod passes through the high-temperature resistant spring and a pair of limit through holes arranged at the lower part of the seal boss;
in the above technical scheme, in structure A or structure B, limit baffle sets up 4 annular equipartition's baffle through-holes, seals and separates the screw hole that separates the support lower part and set up 4 annular equipartitions, limit baffle passes through bolted connection with sealing and separating the support.
C. The lower part of the guide support is provided with a spherical groove A and a spherical groove B, the spherical groove A is in sealing connection with a spherical bulge at the lower part of the heater, a middle cavity of a fluid channel is arranged between the spherical groove A and the spherical groove B, the spherical groove B is arranged at the lower part of the middle cavity, the spherical groove B is connected with a sealing boss, the sealing support is provided with a symmetrically distributed fluid flow channel, the middle part of the sealing support is provided with a middle cavity for placing the sealing boss, the middle part of the sealing support is provided with an annular sealing boss for placing a sealing ring, the bottom of the sealing support is welded with a limit baffle, the bottom of the guide support is provided with the spherical groove B matched with the sealing boss, the upper half part of the sealing boss is of a spherical structure and is connected with the spherical groove B at the lower part of the guide support, the center part of the limit baffle is provided with a pressure injection hole for welding a pressure injection valve, and the lower part of the sealing boss passes through the sealing ring;
D. the guide support lower part sets up spherical recess A, with the spherical protruding sealing connection of heater lower part, seal and separate support upper portion and set up spherical recess four, spherical recess four is connected with sealed boss, and spherical recess four lower parts set up the fluid channel of symmetric distribution, seal and separate the middle part cavity that the support middle part set up was used for placing sealed boss and limit baffle, and sealed boss upper half is spherical, is connected with seal and separate the spherical recess four on support upper portion, and sealed boss upper portion sets up the square hole that is used for the square channel cooperation setting with the heater lower part, and sealed boss upper portion sets up the reverse T shape passageway that is used for circulating high temperature fluid, and sealed boss lower part sets up the cylindrical arch that is used for passing limit baffle, the fixed through-hole that limit baffle middle part set up passes sealed boss lower part.
In the technical scheme, the T-shaped guide rod at the lower part of the heater is welded with the lower part of the heater, the outer part of the T-shaped guide rod is square, the middle part of the T-shaped guide rod is provided with a guide rod through hole, and the T-shaped guide rod is connected with the square hole of the sealing boss.
In the technical scheme, the sleeve is welded at the upper part of the guide support, and the flower pipe is welded at the lower part of the reinforcing support.
The invention has simple structure, the packer and the sleeve are welded into a whole on the ground, then the heat injection well is put in, the packer is made of high-temperature alloy and has good high-temperature and high-pressure resistance, the packer and the sleeve are welded into a whole, the sealing performance of the packer is good, and the heat injection well is ensured to maintain a high-temperature and high-pressure state when the downhole heater is replaced by combining the sealing rod of the heater with the sealing boss of the packer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the present invention and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment A of the present invention;
FIG. 2 is a schematic diagram of a structure of an embodiment B of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment C of the present invention;
FIG. 4 is a schematic diagram of a structure of an embodiment D of the present invention;
the device comprises a guide support 1, a spherical groove A101, a spherical groove B102, a sealing support 2, a fluid flow channel 21, a hollow cavity in the middle of the guide support 22, a threaded hole 23, a spherical groove I241, a spherical groove II, a spherical groove III of 243, a spherical groove IV of 244, a reinforcing support 3, a limit baffle 4, a baffle through hole 41, a runner through hole 42, a pressure injection hole 43, a fixed through hole 44, a sealing boss 5, a limit through hole 51, a well cementation cement 6, a flower pipe 7, a sleeve 8, a stratum 9, a limit baffle rod 10, a sealing rod 11, a sealing rod 111, a sealing rod through hole 12, a high-temperature resistant spring 13, a pressure injection valve 14, a sealing ring 15, a downhole heater 151 spherical bulge 152 guide rod through hole 153T-shaped guide rod.
Description of the embodiments
The foregoing and other objects and advantages of the invention will be apparent from the following, more particular description of the invention, as illustrated in the accompanying drawings. All other embodiments, based on the embodiments of the present invention disclosed herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present invention.
The packer comprises a packing support, a guiding support and a reinforcing support, wherein the reinforcing support is welded with the lower part of the packing support, and the lower part of the guiding support is welded with the packing support into a whole.
The inner diameter of the upper part of the guide support is larger than that of the lower part, the inner diameter of the upper part of the guide support is consistent with that of the sleeve, and the upper part of the guide support and the sleeve are welded into a whole.
When the underground heater is connected, the guide support plays a guide role to ensure the connection of the lower part of the heater; meanwhile, the guide support can further enhance the connection strength between the upper part of the packing support and the sleeve.
The reinforcing support is welded with the lower part of the packing support into a whole, so that the connecting strength of the lower part of the packing support and the flower pipe can be enhanced, the outer diameter of the reinforcing support is consistent with the outer diameter of a well cementation cement ring, and the flower pipe is prevented from being blocked by cement.
According to the difference of the packing support structures, the following four embodiments are disclosed, and specific structures of the embodiments are specifically described and illustrated:
according to the embodiment a shown in fig. 1: the lower part of the guide support is provided with a spherical groove A which is in sealing connection with a spherical bulge at the lower part of the heater, the upper part of the sealing support is provided with a fluid flow channel and a spherical groove II which is connected with a sealing boss, a middle cavity is arranged in the middle part and used for circulating high-temperature fluid, and meanwhile, the middle cavity is internally provided with the sealing boss and a limiting stop rod; the upper half part of the sealing boss is of a spherical structure, and a threaded hole is formed in the top of the sealing boss and is used for being connected with a sealing rod; the lower part of the sealing boss is provided with symmetrically distributed limiting through holes which are used for penetrating through the limiting stop rod to limit the displacement of the sealing boss in the horizontal plane.
The limiting baffle rods are symmetrically arranged on the upper parts of the limiting baffles, and the limiting baffles and the limiting baffle rods are welded together.
The lower part of the sealing and isolating support is provided with 4 screw holes uniformly distributed in a ring shape, the limit baffle is provided with 4 baffle through holes uniformly distributed in a ring shape, and bolts penetrate through the screw holes and the baffle through holes to fix the limit baffle at the lower part of the sealing and isolating support.
The middle part of the limit baffle is provided with a flow passage through hole for circulating high-temperature fluid, the sealing rod is placed in a middle cavity of the sealing support, the axial section of the sealing rod is T-shaped, the upper part of the sealing rod is provided with sealing rod through holes uniformly distributed in a ring shape for circulating high-temperature fluid, the middle part of the sealing rod is a smooth round rod, the lower part of the sealing rod is provided with external threads, and the sealing rod is connected with the sealing boss through the threads;
when the technical scheme of the embodiment is used, the limit baffle is fixed by using the bolts, the guide support and the reinforcing support are respectively welded on the upper part and the lower part of the packing support, and finally the sleeve and the flower pipe are respectively welded on the upper part of the guide support and the lower part of the reinforcing support. A sleeve welded with a packing support is put into a construction well, and then well cementation cement is used for well cementation; and welding the sealing rod at an outlet of the underground heater, then, putting the sealing rod into the underground heater, connecting a spherical boss at the lower part of the underground heater with a spherical groove A at the lower part of the guide support, and sealing the joint. Meanwhile, the external thread at the lower part of the sealing rod is connected with the internal thread of the sealing boss. The downhole heater may then inject a fluid at high temperature and pressure into the wellbore.
When the underground heater needs to be replaced, the underground heater is lifted up, the sealing rod drives the sealing boss to move up to a spherical groove II in the middle of the sealing support in the lifting process of the underground heater, and the sealing boss contacts with the spherical groove II, so that the sealing effect on high-temperature and high-pressure fluid in the well is realized. At this time, the upper part of the sealing boss is pressureless, while the lower part of the sealing boss is in high pressure condition, and the sealing boss always keeps close contact with the second spherical groove under the action of pressure difference.
According to the embodiment shown in fig. 2, embodiment B: the upper part of the sealing support is provided with a first spherical groove which is used for being matched with a spherical bulge at the lower part of the downhole heater to seal the joint. The lower part of the spherical groove is provided with a middle cavity of the fluid channel, the middle cavity is used for circulating high-temperature fluid, the lower part of the middle cavity is provided with a third spherical groove, and the third spherical groove is connected with the sealing boss. The limiting baffle is provided with 4 baffle through holes uniformly distributed in a ring shape, the lower part of the sealing and isolating support is provided with 4 threaded holes uniformly distributed in a ring shape, and the lower part of the sealing and isolating support is connected with the limiting baffle through bolts.
The upper part of the limit baffle is provided with symmetrically distributed limit baffle rods which are inverted trapezoids and are used for limiting radial displacement of the high-temperature spring and the sealing boss. Meanwhile, a flow passage through hole for circulating high-temperature fluid is formed in the middle of the limiting baffle, and the limiting baffle and the limiting stop rod are welded together; the spherical groove III at the lower part of the sealing support is connected with a sealing boss, the upper half part of the sealing boss is of a spherical structure and is embedded in the spherical groove III at the lower part of the sealing support, so that high-temperature and high-pressure fluid in the heat injection well is prevented from recharging to the heat injection well; the lower part of the sealing boss is provided with a pair of symmetrically distributed limiting through holes which are used for penetrating through a limiting stop rod to limit the radial displacement of the sealing boss, the high-temperature resistant spring is arranged at the lower part of the sealing boss, and the limiting stop rod penetrates through the high-temperature resistant spring and the pair of limiting through holes arranged at the lower part of the sealing boss.
When the technical scheme of the embodiment is used, the high-temperature-resistant spring is placed at the lower part of the sealing boss, the limiting baffle rod penetrates through the high-temperature-resistant spring and the pair of limiting through holes arranged at the lower part of the sealing boss, and the limiting baffle plate is fixed by bolts; and finally, respectively welding the sleeve and the flower pipe on the upper part of the guide support and the lower part of the reinforced support. A sleeve welded with a packing support is put in, then well cementation is carried out, a downhole heater is put in, a spherical boss at the lower part of the downhole heater is connected with a spherical groove I arranged at the upper part of the packing support, and sealing of a joint is realized; the downhole heater may then inject a fluid at high temperature and pressure into the wellbore.
When the underground heater needs to be replaced, the injection of gas is stopped, the underground heater is lifted up, at the moment, the upper part of the sealing boss is pressureless, the lower part of the sealing boss is in a high-pressure condition, and under the action of pressure difference, the sealing boss always keeps close contact with the spherical groove III, so that the sealing effect on high-temperature high-pressure fluid in the well is realized.
According to the embodiment shown in fig. 3, embodiment C: the lower part of the guide support is provided with a spherical groove A and a spherical groove B, the spherical groove A is in sealing connection with a spherical bulge at the lower part of the heater, a middle cavity of the fluid channel is arranged between the spherical groove A and the spherical groove B, the spherical groove B is arranged at the lower part of the middle cavity, and the spherical groove B is connected with a sealing boss. The sealing support is provided with a symmetrical fluid flow channel, the middle part of the sealing support is provided with a middle cavity for placing a sealing boss, and an annular sealing boss for placing a sealing ring is arranged, the bottom of the sealing support is welded with a limit baffle, the center part of the limit baffle is provided with a pressure injection hole for welding a pressure injection valve, the pressure injection valve is used for injecting high-pressure gas into the cavity of the sealing support, under the action of pressure, the sealing boss is pushed to move upwards, so that the spherical structure at the upper half part of the sealing boss is connected with a spherical groove B at the lower part of the guiding support, after the pressure injection is finished, the pressure injection valve and the limit baffle are welded into a whole, the sealing performance of the sealing support cavity is improved, and the high-pressure gas is ensured to generate enough thrust for the sealing boss; the bottom of the guide support is provided with the spherical groove B which is matched with the sealing boss, the upper half part of the sealing boss is of a spherical structure and is connected with the spherical groove B at the lower part of the guide support, so that high-temperature and high-pressure fluid in the heat injection well is prevented from recharging to the heat injection well, and the lower part of the sealing boss passes through the sealing ring and is used for limiting radial displacement of the sealing boss.
When the technical scheme of the embodiment is used, the sealing ring and the packing support are welded together, then the sealing boss penetrates through the sealing ring, the limit baffle is welded together with the packing support, high-pressure gas is injected into the cavity of the packing support through the pressure injection valve, and then the pressure injection valve and the limit baffle are welded into a whole. Welding a guide support and a reinforcement support on the upper part and the lower part of a packing support respectively, finally, welding a sleeve and a flower pipe on the upper part of the guide support and the lower part of the reinforcement support respectively, putting the sleeve welded with the packing support into the sleeve, and then cementing the well; the underground heater is put into the well, the spherical boss at the lower part of the underground heater is connected with the spherical groove A at the upper part of the guide support, so that the joint is sealed; the downhole heater may then inject a fluid at high temperature and pressure into the wellbore.
When the underground heater needs to be replaced, the injection of gas is stopped, the underground heater is lifted up, at the moment, the upper part of the sealing boss is pressureless, the lower part of the sealing boss is in a high-pressure condition, and under the action of pressure difference, the sealing boss always keeps close contact with the spherical groove B, so that the sealing effect on high-temperature high-pressure fluid in the well is realized.
According to embodiment D, shown in fig. 4: the lower part of the guide support is provided with a spherical groove A which is in sealing connection with a spherical bulge at the lower part of the heater, the upper part of the sealing support is provided with a spherical groove IV, and the spherical groove is connected with a sealing boss. The four lower parts of the spherical grooves are provided with symmetrically distributed fluid channels for circulating high-temperature fluid, the middle part of the sealing support is provided with a middle cavity for placing a sealing boss and a limit baffle, the upper half part of the sealing boss is of a spherical structure and is connected with the spherical grooves on the upper part of the sealing support, sealing effect is achieved on the joint, high-temperature and high-pressure fluid in a heat injection well is prevented from recharging to the heat injection well, the upper part of the sealing boss is provided with square holes matched with square holes on the lower part of a heater, the effect of circulating high-temperature fluid and sealing the fluid flow channels is achieved, a T-shaped guide rod on the lower part of the downhole heater is welded with the lower part of the heater, the lower part of the T-shaped guide rod is square, a guide rod through hole is formed in the middle part of the sealing boss, the lower part of the sealing boss is provided with a cylindrical bulge for penetrating the limit baffle, the middle part of the limit baffle is provided with a fixed through hole for penetrating the lower part of the sealing boss, vertical displacement of the sealing boss is limited, and the limit baffle and the sealing support is welded into a whole.
When the technical scheme of the embodiment is used, the sealing boss penetrates through the middle of the sealing support, the limit baffle penetrates through the lower part of the sealing boss and is welded with the sealing support into a whole, the position of the sealing boss is adjusted, and the communication of the sealing boss and the fluid flow channel of the sealing support is ensured. The guide support and the reinforcement support are welded on the upper part and the lower part of the packing support respectively. And finally, respectively welding the sleeve and the flower pipe on the upper part of the guide support and the lower part of the reinforced support. And (3) putting a sleeve welded with the packing support, and then cementing the well. And the spherical boss at the lower part of the underground heater is connected with the spherical groove IV at the upper part of the guide support, so that the joint is sealed. The T-shaped guide rod at the lower part of the downhole heater is welded with the lower part of the heater, the T-shaped guide rod is connected with the square hole of the sealing boss, and the downhole heater can inject high-temperature and high-pressure fluid into the shaft.
When the underground heater needs to be replaced, the gas injection is stopped, the underground heater is rotated for 90 degrees, at the moment, the fluid channel of the sealing boss is perpendicular to the fluid channel of the sealing support, the sealing effect on high-temperature and high-pressure fluid in the well is achieved, and then the underground heater is lifted up.
The foregoing is merely specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present invention disclosed in the present invention, and the changes or substitutions are covered by the protection scope of the present invention. Therefore, the protection scope of the patent of the invention is subject to the protection scope of the claims.
Claims (5)
1. A packer, characterized in that: including packing the support, the direction support, strengthen the support and seal and separate support lower part welding, the direction support lower part seals with sealing and separate the support welding, seal and separate the support and include any structure as follows:
the structure A is characterized in that a spherical groove A is arranged at the lower part of the guide support and is in sealing connection with a spherical bulge at the lower part of the heater, a fluid flow channel and a spherical groove II are arranged at the upper part of the sealing support and are connected with a sealing boss, and a sealing boss and a limiting stop rod are arranged in a middle cavity arranged at the middle part of the sealing support; the limiting baffle is fixed at the lower part of the sealing support, a pair of limiting baffle rods are symmetrically arranged at the upper part of the limiting baffle, the limiting baffle is welded with the limiting baffle rods, and a flow passage through hole is formed in the middle of the limiting baffle; the sealing rod is placed in the middle cavity of the packing support, annular uniformly distributed sealing rod through holes are formed in the upper part of the sealing rod, the middle part of the sealing rod is a smooth round rod, and the lower part of the sealing rod is connected with the sealing boss;
the upper part of the guide support is welded with a sleeve, the upper part of the packing support is provided with a first spherical groove which is connected with a spherical bulge at the lower part of the heater, the lower part of the spherical groove is provided with a cavity at the middle part of the fluid channel, the lower part of the cavity at the middle part is provided with a third spherical groove which is connected with a sealing boss, the lower part of the packing support is connected with a limit baffle through a bolt, the upper part of the limit baffle is provided with a pair of symmetrically distributed limit baffle rods, and the limit baffle rods are welded together; the middle part of the limit baffle is provided with a flow passage through hole, the limit baffle rod is in an inverted trapezoid shape, the spherical groove III at the lower part of the seal baffle support is connected with the seal boss, the spherical seal boss at the upper part is embedded in the spherical groove III, the lower part of the seal boss is provided with a pair of symmetrically distributed limit through holes for passing through the limit baffle rod, the high-temperature resistant spring is arranged at the lower part of the seal boss, and the limit baffle rod passes through the high-temperature resistant spring and a pair of limit through holes arranged at the lower part of the seal boss;
the lower part of the guide support is provided with a spherical groove A and a spherical groove B, the spherical groove A is in sealing connection with a spherical bulge at the lower part of the heater, a cavity in the middle of a fluid channel is arranged between the spherical groove A and the spherical groove B, the spherical groove B is arranged at the lower part of the cavity in the middle, the spherical groove B is connected with a sealing boss, the sealing support is provided with a pair of symmetrically distributed fluid flow channels, the middle of the sealing support is provided with a middle cavity for placing the sealing boss, the middle of the sealing support is provided with an annular sealing boss for placing a sealing ring, the bottom of the sealing support is welded with a limit baffle, the bottom of the guide support is provided with the spherical groove B matched with the sealing boss, the upper half part of the sealing boss is in a spherical structure and is connected with the spherical groove B at the lower part of the guide support, the center part of the limit baffle is provided with a pressure injection hole for welding a pressure injection valve, and the lower part of the sealing boss penetrates through the sealing ring;
structure D the guide support lower part sets up spherical recess A, with the spherical protruding sealing connection of heater lower part, seal and separate support upper portion and set up spherical recess four, spherical recess four is connected with sealed boss, and spherical recess four lower parts set up the fluid channel of symmetric distribution, seal and separate the support middle part setting and be used for placing sealed boss and limit baffle's middle part cavity, and sealed boss upper half is spherical, is connected with seal and separate the spherical recess four on support upper portion, and sealed boss upper portion sets up the square hole that is used for the square channel cooperation setting with the heater lower part, and sealed boss upper portion sets up the reverse T shape passageway that is used for circulating high temperature fluid, and sealed boss lower part sets up the cylindrical arch that is used for passing limit baffle, and the fixed through-hole that limit baffle middle part set up is used for passing sealed boss lower part.
2. A packer according to claim 1, characterized in that: in the structure A, the structure C or the structure D, the upper part of the guide support is welded with a sleeve, and the lower part of the reinforcing support is welded with a flower pipe.
3. A packer according to claim 1 or 2, characterized in that: in the structure A or B, the limit baffle is provided with 4 baffle through holes uniformly distributed in a ring shape, the lower part of the sealing and isolating support is provided with 4 threaded holes uniformly distributed in a ring shape, and the limit baffle is connected with the sealing and isolating support through bolts.
4. A packer according to claim 1, characterized in that: the upper half part of the sealing boss in the structure A is spherical, a threaded hole used for being connected with a sealing rod is formed in the top of the sealing boss, a pair of limiting through holes used for penetrating through a limiting stop rod are formed in the lower part of the sealing boss, and the limiting through holes are symmetrically distributed.
5. A packer according to claim 1 or 2, characterized in that: in the structure D, a T-shaped guide rod at the lower part of the heater is welded with the lower part of the heater, the lower part of the T-shaped guide rod is square, a guide rod through hole is arranged in the middle of the T-shaped guide rod, and the T-shaped guide rod is connected with a square hole of a sealing boss.
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| CN114482906A (en) | 2022-05-13 |
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