CN116006096B - Safety joint and use method thereof - Google Patents

Safety joint and use method thereof Download PDF

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Publication number
CN116006096B
CN116006096B CN202310304260.7A CN202310304260A CN116006096B CN 116006096 B CN116006096 B CN 116006096B CN 202310304260 A CN202310304260 A CN 202310304260A CN 116006096 B CN116006096 B CN 116006096B
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ring
sealing
joint
graphite
groove
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CN116006096A (en
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李振华
张海荣
张天保
李妍慧
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Weida Petroleum Equipment Co ltd
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Weida Petroleum Equipment Co ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

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  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Earth Drilling (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

The invention relates to the technical field of drilling, in particular to a safety joint and a using method thereof. The safety joint comprises a male joint and a female joint which are in wide-sawtooth threaded connection, a first sealing mechanism is embedded at the lower butt joint part of the male joint and the female joint, the first sealing mechanism comprises a first axial compensation piece, a first graphite sealing ring is arranged on the upper end face of the first axial compensation piece, a second graphite sealing ring is arranged on the lower end face of the first axial compensation piece, and the first axial compensation piece can axially stretch out and draw back. According to the invention, the graphite sealing ring with good thermal stability is adopted for sealing, and the axial compensation piece capable of compensating the axial gap is matched, so that the sealing stability of the safety joint under the working condition of high-low temperature alternation is improved, and the process requirement of dry-hot rock well drilling is fully met.

Description

Safety joint and use method thereof
Technical Field
The invention relates to the technical field of drilling, in particular to a safety joint and a using method thereof.
Background
In the dry-hot rock well drilling process, the safety joint is a disengaging and butting safety tool for underground pipe columns, and the safety joint has the effects that when underground faults occur or pipe columns are blocked, the pipe columns meeting the blocking are disengaged from the safety joint, so that the operation risk is reduced, the operation load is reduced, and the operation safety is improved. The common safety joint mainly comprises two types of shear pins and zigzag back-buckling type.
The application number CN201220356121.6 discloses a zigzag thread safety joint, including female joint, male joint, upper seal circle and lower sealing washer, female joint is connected with the male joint through zigzag thread, is equipped with upper seal circle and lower sealing washer between female joint and the male joint, and female joint upper portion is equipped with connecting thread, and the male joint lower part is equipped with connecting thread. The safety joint is reasonable in structural design and convenient to use, but the safety joint is designed for a cold production well, and the upper sealing ring and the lower sealing ring are conventional rubber sealing rings and fail under the high-temperature condition, so that the working condition of 200-300 ℃ of dry and hot rock drilling cannot be met, and further the production is influenced; in addition, the safety joint made of metal materials in the dry-hot rock well generates expansion and contraction phenomena along with high-low temperature alternation, and the axial gap between the male joint and the female joint can be changed, so that the sealing effect is affected.
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides a safety joint which comprises a male joint and a female joint which are in threaded connection with wide saw teeth, wherein a first sealing mechanism is embedded at the lower butt joint part of the male joint and the female joint and comprises a first axial compensation piece, the upper end face of the first axial compensation piece is provided with a first graphite sealing ring, the lower end face of the first axial compensation piece is provided with a second graphite sealing ring, and the first axial compensation piece can axially stretch.
Preferably, the male connector comprises a circular first lower connecting end and a first upper connecting end, the inner annular surface of the first lower connecting end is provided with connecting threads, the upper end surface is provided with a first annular groove, the outer annular surface of the first upper connecting end is provided with a sawtooth threaded part, the upper end surface is provided with a second annular groove, and a high-temperature-resistant sealing ring is embedded above the outer side wall of the male connector; the female joint comprises a circular second lower connecting end and a second upper connecting end, the inner ring surface of the second lower connecting end is provided with a saw tooth thread groove corresponding to the saw tooth thread part, the lower end surface is provided with a first embedded groove, the upper end surface is provided with an annular sealing sliding groove, and the outer ring surface of the second upper connecting end is provided with connecting threads.
Preferably, the first axial compensation piece comprises a thermal expansion piece which is heated and elongated, the upper end face of the thermal expansion piece is connected with a first lifting ring, the lower end face of the thermal expansion piece is connected with a second lifting ring, the first graphite sealing ring and the second graphite sealing ring are both provided with L-shaped sections, the first graphite sealing ring is embedded into a first embedded groove at the lower joint of the female joint, and the second graphite sealing ring is embedded into a first annular groove at the lower joint of the male joint.
Preferably, the thermal expansion piece comprises a plurality of circumferentially equidistant piston cylinders, first spacing protrusions and second spacing protrusions are arranged on the inner axes of the piston cylinders at intervals, a first piston is arranged above the first spacing protrusions and connected with a first piston rod, the first piston rod is connected with a first lifting ring, a first spring is sleeved on the first piston rod, a second piston is arranged below the second spacing protrusions and connected with a second piston rod, the second piston rod is connected with the second lifting ring, a second spring is sleeved on the second piston rod, and thermal expansion liquid is arranged between the first piston and the second piston.
Preferably, the second sealing mechanism is embedded at the upper butt joint part of the male connector and the female connector, the second sealing mechanism comprises a third graphite sealing ring and a fourth graphite sealing ring which are coaxially arranged at intervals, and the upper end surfaces of the third graphite sealing ring and the fourth graphite sealing ring are provided with second axial compensators which axially stretch.
Preferably, the second axial compensation piece comprises a sealing compression ring, the lower end surface of the sealing compression ring compresses the third graphite sealing ring and the fourth graphite sealing ring, the upper end surface of the sealing compression ring is connected with an annular piston, the annular piston is slidably arranged in a sealing sliding groove on the female joint, an expansion liquid is contained in a sealing cavity formed by the sealing piston and the annular piston, one ends of a plurality of memory springs which are arranged at equal intervals are fixed in the sealing sliding groove, and the other ends of the memory springs are connected with the annular piston; the annular piston is of a T-shaped section and sequentially comprises a first sealing part, a second sealing part and a sliding part from top to bottom, wherein the first sealing part and the second sealing part are arranged at intervals, the sealing sliding groove comprises an upper sliding groove and a lower sliding groove, and the first sealing part and the second sealing part are in sealing sliding in the upper sliding groove.
Preferably, the third graphite sealing ring and the fourth graphite sealing ring are arranged in a second annular groove at the joint of the male connector, the third graphite sealing ring and the fourth graphite sealing ring are both provided with diamond-shaped sections, the upper end surfaces and the lower end surfaces of the third graphite sealing ring and the fourth graphite sealing ring jointly form a V-shaped structure, the lower end surface of the sealing pressing ring is provided with a corresponding V-shaped section, and the second annular groove is also provided with a corresponding V-shaped section.
Preferably, the upper end face of the sealing compression ring is fixedly provided with a connecting ring, the upper end face of the connecting ring is connected with the annular piston, the outer side of the connecting ring is provided with a first memory metal ring and a first tensioning mechanism, the inner side of the connecting ring is provided with a second memory metal ring and a second tensioning mechanism, the outer groove wall of the lower sliding groove is provided with a second embedded groove, the inner groove wall is provided with a third embedded groove, the first memory metal ring is embedded into the second embedded groove and is separated from the second embedded groove after being deformed by heating, the second memory metal ring is embedded into the third embedded groove and is separated from the third embedded groove after being deformed by heating.
Preferably, the first tensioning mechanism comprises a first lower fixed ring and a first upper fixed ring, the lower end face of the first upper fixed ring is connected with a third spring, the lower end of the third spring is connected with a first movable ring, the first memory metal ring is clamped by the first lower fixed ring and the first movable ring, the second tensioning mechanism comprises a second lower fixed ring and a second upper fixed ring, the lower end face of the second upper fixed ring is connected with a fourth spring, the lower end of the fourth spring is connected with a second movable ring, and the second memory metal ring is clamped by the second lower fixed ring and the second movable ring.
The invention provides a use method of a safety joint, which comprises the following steps:
step S100, embedding a first sealing mechanism at the lower abutting position of the male connector and the female connector, and embedding a second sealing mechanism at the upper abutting position of the male connector and the female connector; connecting the male connector with the downstream pipe string, and connecting the female connector with the upstream pipe string and then entering a preset position in the well;
step S200, when a dry-hot rock well is drilled, a safety joint made of metal materials is heated and axially stretched, an axial gap at the joint of a male joint and a female joint is increased, a first sealing mechanism and a second sealing mechanism are axially stretched, and the axial gap generated by high temperature is compensated, so that the first sealing mechanism and the second sealing mechanism are always tightly abutted with the male joint and the female joint, and the sealing effect is improved;
and step 300, when the trip is required, providing torque force for the upstream pipe string of the female joint, and disconnecting the female joint from the male joint by rotation, wherein the male joint and the downstream pipe string are left in the pit.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the lower abutting part of the male connector and the female connector is embedded with a first sealing mechanism, the first sealing mechanism adopts a first axial compensation piece to axially compensate, and a graphite ring with good thermal stability is adopted to form an axial double-sealing structure, so that the sealing effect at high temperature can be fully ensured;
2. the first axial compensation piece is provided with a thermal expansion piece capable of responding to temperature change, expansion liquid is used as a driving source of thermal compensation, the thermal response effect of the expansion liquid is good, the driving force provided during expansion is high, the axial compensation can be rapidly carried out, and enough expansion force can be provided to compress the first graphite sealing ring and the second graphite sealing ring; the first lifting ring and the second lifting ring push the first graphite sealing ring and the second graphite sealing ring to lift, so that the first graphite sealing ring and the second graphite sealing ring can be uniformly stressed, and the first graphite sealing ring and the second graphite sealing ring are fully protected from being damaged;
3. the upper butt joint part of the male connector and the female connector is embedded with a second sealing mechanism, the second sealing mechanism adopts a second axial compensation piece to axially compensate, and a graphite ring with good thermal stability is adopted to form a radial double-sealing structure, so that the sealing effect can be further improved by being matched with the first sealing mechanism;
4. the annular piston of the second sealing mechanism is provided with a first sealing part and a second sealing part, so that an axial double-sealing structure is formed, and the sealing performance of the piston ring is improved;
5. the memory spring and the expansion liquid of the second sealing mechanism can correspondingly change in temperature, the annular piston is lifted up at low temperature, the annular piston is pressed down at high temperature, and the axial gap between the male connector and the female connector is compensated and adjusted in real time;
6. the first memory metal ring and the second memory metal ring of the second sealing mechanism can correspondingly change in temperature, lock or unlock the annular piston, and meet the use requirements at different temperatures;
7. the third graphite sealing ring and the fourth graphite sealing ring are both provided with diamond-shaped sections, and the second annular groove and the sealing compression ring respectively form a V-shaped sealing structure with the second annular groove and the sealing compression ring, so that the sealing effect is further improved;
in conclusion, the graphite sealing ring with good thermal stability is adopted for sealing, and the axial compensation piece capable of compensating the axial gap is matched, so that the sealing stability of the safety joint under the working condition of high-low temperature alternation is improved, and the process requirement of dry-hot rock drilling is fully met.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1A;
FIG. 3 is a perspective cross-sectional view of a male connector;
FIG. 4 is a perspective cross-sectional view of a female connector;
FIG. 5 is a perspective cross-sectional view of the first seal mechanism;
FIG. 6 is a perspective cross-sectional view of a thermal expansion member;
fig. 7 is a perspective sectional view of the second sealing mechanism.
Reference numerals illustrate:
1. the male joint, 11, the first lower connecting end, 12, the first upper connecting end, 13, the first annular groove, 14, the zigzag screw portion, 15, the second annular groove, 2, the female joint, 21, the second lower connecting end, 22, the second upper connecting end, 23, the zigzag screw groove, 24, the first fitting groove, 25, the seal groove, 251, the upper groove, 252, the lower groove, 2521, the second fitting groove, 2522, the third fitting groove, 3, the first sealing mechanism, 31, the first axial compensator, 311, the thermal expansion member, 3111, the piston cylinder, 3112, the first limit protrusion, 3113, the second limit protrusion, 3114, the first piston, 3115, the first piston rod, 3116, the first spring, 3117, the second piston, 3118, the second piston rod, 3119, the second spring, 312, the first lift ring, 313, the second lift ring, 32, first graphite seal ring, 33, second graphite seal ring, 4, high temperature resistant seal ring, 5, second seal mechanism, 51, third graphite seal ring, 52, fourth graphite seal ring, 53, second axial compensator, 531, seal press ring, 532, annular piston, 5321, first seal portion, 5322, second seal portion, 5323, slide portion, 533, memory spring, 534, connecting ring, 535, first memory metal ring, 536, first tensioning mechanism, 5361, first lower fixed ring, 5362, first movable ring, 5363, third spring, 5364, first upper fixed ring, 537, second memory metal ring, 538, second tensioning mechanism, 5381, second lower fixed ring, 5382, second movable ring, 5383, fourth spring, 5384, second upper fixed ring.
Detailed Description
The following describes specific embodiments of the invention with reference to the drawings and examples:
it should be noted that the structures, proportions, sizes, etc. shown in the drawings are merely for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the invention, which is defined by the appended claims.
Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
Example 1
With reference to fig. 1 to 7, this embodiment provides a safety joint, including wide sawtooth threaded connection's public joint 1 and female joint 2, its characterized in that, first sealing mechanism 3 is inlayed to public joint 1 and female joint 2's lower butt department, first sealing mechanism 3 includes first axial compensation piece 31, the up end of first axial compensation piece 31 is equipped with first graphite sealing ring 32, and the lower terminal surface is equipped with second graphite sealing ring 33, first axial compensation piece 31 can axially stretch out and draw back. In the above technical scheme, the first graphite sealing ring 32 and the second graphite sealing ring 33 of the first sealing mechanism 3 form an axial double-sealing structure, the upper end face and the outer annular face of the first graphite sealing ring 32 are tightly abutted against the female connector 2, the inner annular face is tightly abutted against the male connector 1, the lower end face and the inner annular face of the second graphite sealing ring 33 are tightly abutted against the male connector 1, the outer annular face is tightly abutted against the female connector 2, the heat stability and the sealing effect of the first sealing mechanism 3 are further improved, the first axial compensation piece 31 can axially stretch and retract, and the first graphite sealing ring 32 and the second graphite sealing ring 33 are fully compressed. The first axial compensator 31 may employ a conventional resilient metal element such as a round spring or the like.
In a specific structure, the male connector 1 comprises a circular first lower connecting end 11 and a first upper connecting end 12, the inner ring surface of the first lower connecting end 11 is provided with connecting threads, the upper end surface is provided with a first annular groove 13, the outer ring surface of the first upper connecting end 12 is provided with a sawtooth threaded part 14, the upper end surface is provided with a second annular groove 15, and a high-temperature resistant sealing ring 4 is embedded above the outer side wall of the male connector 1; the female connector 2 comprises a circular second lower connecting end 21 and a second upper connecting end 22, a saw tooth thread groove 23 corresponding to the saw tooth thread part 14 is formed in the inner annular surface of the second lower connecting end 21, a first embedded groove 24 is formed in the lower end surface, a circular sealing sliding groove 25 is formed in the upper end surface, and connecting threads are formed in the outer annular surface of the second upper connecting end 22. In the above technical solution, the lower contact position of the male connector 1 and the female connector 2 is the upper end surface of the first lower connection end 11 of the male connector 1 and the lower end surface of the second lower connection end 21 of the female connector 2; the first sealing means 3 is embedded in an annular space formed by the first annular groove 13 and the first embedding groove 24. The high temperature resistant sealing ring 4 is preferably made of fluororubber and plays an auxiliary sealing role. The direction of the threads is configured according to common knowledge in the art, i.e. the direction of rotation of the connection threads of the male connector 1 and the connection threads of the female connector 2 is opposite to the direction of rotation of the serration thread parts 14 of the male connector 1.
The working principle and working process of the embodiment are as follows: embedding a first sealing mechanism 3 at the lower abutting part of a male connector 1 and a female connector 2, connecting the male connector 1 with a downstream pipe string, and connecting the female connector 2 with an upstream pipe string and then entering a preset position in a well; when a dry-hot rock well is drilled, the safety joint made of metal materials is heated and axially stretched, the axial clearance at the abutting part of the male joint 1 and the female joint 2 is increased, the first sealing mechanism 3 is axially stretched, the axial clearance generated by high temperature is compensated, the first graphite sealing ring 32 and the second graphite sealing ring 33 are always tightly abutted with the male joint 1 and the female joint 2, and the sealing effect is improved; when tripping is required, torque force is provided for the upstream pipe string of the female connector 2, the female connector 2 rotates to be disconnected with the male connector 1, and the male connector 1 and the downstream pipe string are left underground.
In this embodiment, the first sealing mechanism 3 adopts the first axial compensator 31 to perform axial compensation, and adopts the graphite ring with good thermal stability to form an axial double-sealing structure, so that the sealing effect at high temperature can be fully ensured.
Example 2
With reference to fig. 1 to 7, this embodiment provides a safety joint, and on the basis of embodiment 1, the first axial compensation element 31 is specially designed to have a thermal expansion function, so as to further improve the compensation effect, and the specific technical scheme is as follows,
the first axial compensation piece 31 comprises a thermal expansion piece 311 which is elongated by heating, the upper end face of the thermal expansion piece 311 is connected with a first lifting ring 312, the lower end face of the thermal expansion piece 311 is connected with a second lifting ring 313, the first graphite sealing ring 32 and the second graphite sealing ring 33 are both provided with L-shaped sections, the first graphite sealing ring 32 is embedded into the first embedded groove 24 at the lower abutting part of the female joint 2, and the second graphite sealing ring 33 is embedded into the first annular groove 13 at the lower abutting part of the male joint 1. In the above technical scheme, the thermal expansion piece 311 with the thermal expansion function is adopted, compared with the conventional elastic piece, the thermal expansion piece 311 can respond to temperature change, provide proper compression force at normal temperature, elongate at high temperature, provide stronger compression force while compensating axial clearance, and fully ensure sealing effect.
In a specific structure, the thermal expansion member 311 includes a plurality of circumferentially equally spaced piston cylinders 3111, a first limiting protrusion 3112 and a second limiting protrusion 3113 are axially disposed in the piston cylinders 3111 at intervals, a first piston 3114 is disposed above the first limiting protrusion 3112, the first piston 3114 is connected to a first piston rod 3115, the first piston rod 3115 is connected to the first lifting ring 312, a first spring 3116 is sleeved on the first piston rod 3115, a second piston 3117 is disposed below the second limiting protrusion 3113, the second piston 3117 is connected to a second piston rod 3118, the second piston rod 3118 is connected to the second lifting ring 313, a second spring 3119 is sleeved on the second piston rod 3118, and a thermal expansion fluid is disposed between the first piston 3114 and the second piston 3117. In the above technical solution, the expansion liquid is used as the driving source of thermal compensation, the thermal response effect of the expansion liquid is good, the driving force provided during expansion is high, the axial compensation can be rapidly performed, and enough expansion force can be provided to compress the first graphite sealing ring 32 and the second graphite sealing ring 33; the first lifting ring 312 and the second lifting ring 313 push the first graphite sealing ring 32 and the second graphite sealing ring 33 to lift, so that the first graphite sealing ring 32 and the second graphite sealing ring 33 can be uniformly stressed, and the first graphite sealing ring 32 and the second graphite sealing ring 33 are fully protected from being damaged.
The working principle and working process of the embodiment are as follows: in the initial state, the first sealing mechanism 3 is embedded at the lower abutting part of the male connector 1 and the female connector 2; at high temperature, the safety joint made of metal is heated and axially stretched, the gap at the abutting part of the male joint 1 and the female joint 2 is increased, the expansion liquid is heated and expanded, the volume is increased, the first piston rod 3115 and the second piston rod 3118 are pushed to stretch, the first graphite sealing ring 32 and the second graphite sealing ring 33 are tightly pressed through the first lifting ring 312 and the second lifting ring 313, the male joint 1 and the female joint 2 are tightly attached, and the sealing effect is improved; after exploitation is finished, naturally cooling, reducing the gap at the abutting part of the male connector 1 and the female connector 2, cooling and shrinking the expansion liquid, reducing the volume, resetting the first piston rod 3115 and the second piston rod 3118, resetting the first graphite sealing ring 32 and the second graphite sealing ring 33, and recovering the initial sealing state.
Example 3
With reference to fig. 1 to 7, this embodiment provides a safety joint, and on the basis of embodiment 1 or embodiment 2, a second sealing mechanism 5 is added to further improve the sealing effect, and the specific technical scheme is as follows,
the second sealing mechanism 5 is embedded at the upper abutting part of the male connector 1 and the female connector 2, the second sealing mechanism 5 comprises a third graphite sealing ring 51 and a fourth graphite sealing ring 52 which are coaxially arranged at intervals, and a second axial compensator 53 which stretches axially is arranged on the upper end surfaces of the third graphite sealing ring 51 and the fourth graphite sealing ring 52. In the above technical solution, the third graphite sealing ring 51 and the fourth graphite sealing ring 52 form a radial double-sealing structure, the outer annular wall of the third graphite sealing ring 51 is closely abutted against the female connector 2, the lower end face is closely abutted against the male connector 1, the inner annular wall and the lower end face of the fourth graphite sealing ring 52 are closely abutted against the male connector 1, the second axial compensator 53 can axially expand and contract, and fully compress the third graphite sealing ring 51 and the fourth graphite sealing ring 52. The axial double-sealing structure of the first sealing mechanism 3 and the radial double-sealing structure of the second sealing mechanism 5 are matched with each other, so that the sealing effect can be further improved.
In a specific structure, the second axial compensation member 53 includes a sealing compression ring 531, the lower end surface of the sealing compression ring 531 compresses the third graphite sealing ring 51 and the fourth graphite sealing ring 52, the upper end surface is connected with an annular piston 532, the annular piston 532 is slidably disposed in a sealing chute 25 on the female connector 2, an expansion liquid is contained in a sealing cavity formed by the two sealing gaskets, one ends of a plurality of memory springs 533 arranged at equal intervals in circumference are fixed in the sealing chute 25, and the other ends are connected with the annular piston 532; the annular piston 532 is a T-shaped cross section, and sequentially comprises a first sealing portion 5321, a second sealing portion 5322 and a sliding portion 5323 from top to bottom, wherein the first sealing portion 5321 and the second sealing portion 5322 are arranged at intervals, the sealing sliding groove 25 comprises an upper sliding groove 251 and a lower sliding groove 252, and the first sealing portion 5321 and the second sealing portion 5322 slide in the upper sliding groove 251 in a sealing manner. In the technical scheme, the expansion liquid is used as a driving source for thermal compensation, and the function and the principle are the same as the previous. The first seal portion 5321 and the second seal portion 5322 of the annular piston 532 form an axial double seal structure, and the sealability of the annular piston 532 can be further improved. The memory spring 533 has a large diameter and a short length below the deformation temperature, and plays a role in lifting the annular piston 532, and has a small diameter and a long length above the deformation temperature, and plays a role in pushing the annular piston 532, and pushing the annular piston 532 down.
In a specific structure, the third graphite sealing ring 51 and the fourth graphite sealing ring 52 are disposed in the second annular groove 15 at the abutting position on the male connector 1, the third graphite sealing ring 51 and the fourth graphite sealing ring 52 both have diamond-shaped cross sections, the upper end face and the lower end face of the third graphite sealing ring 51 and the fourth graphite sealing ring 52 jointly form a V-shaped structure, the lower end face of the sealing compression ring 531 has a corresponding V-shaped cross section, and the second annular groove 15 also has a corresponding V-shaped cross section. In the above technical scheme, the third graphite sealing ring 51 and the fourth graphite sealing ring 52 have diamond sections, and the second annular groove 15 and the sealing compression ring 531 respectively form a V-shaped sealing structure with the second annular groove 15 and the sealing compression ring 531, so that the sealing effect is further improved.
In a specific structure, a connection ring 534 is fixedly disposed on an upper end surface of the sealing ring 531, the upper end surface of the connection ring 534 is connected with the annular piston 532, a first memory metal ring 535 and a first tensioning mechanism 536 are disposed on the outer side, a second memory metal ring 537 and a second tensioning mechanism 538 are disposed on the inner side, a second embedding groove 2521 is disposed on an outer groove wall of the lower sliding groove 252, a third embedding groove 2522 is disposed on an inner groove wall, the first memory metal ring 535 is embedded in the second embedding groove 2521, and is separated from the second embedding groove 2521 after being deformed by heating, the second memory metal ring 537 is embedded in the third embedding groove 2522, and is separated from the third embedding groove 2522 after being deformed by heating. In the above-mentioned solution, the first memory metal ring 535, the second memory metal ring 537, the second embedded groove 2521 and the third embedded groove 2522 form a locking structure; when the deformation temperature is lower, the outer diameter of the first memory metal ring 535 is larger than the outer diameter of the lower chute 252, the first memory metal ring is embedded into the second embedded groove 2521, the inner diameter of the second memory metal ring 537 is smaller than the inner diameter of the lower chute 252, the second memory metal ring is embedded into the third embedded groove 2522, the sealing compression ring 531 is locked, when the deformation temperature is higher, the outer diameter of the first memory metal ring 535 is smaller than or equal to the outer diameter of the lower chute 252, the second embedded groove 2521 is separated, the inner diameter of the second memory metal ring 537 is larger than or equal to the inner diameter of the lower chute 252, the second memory metal ring 537 is separated from the third embedded groove 2522, and the sealing compression ring 531 is unlocked and can axially and freely move. The deformation temperature of the first and second memory metal rings 535, 537 is less than the thermal expansion temperature of the expansion fluid and the deformation temperature of the memory spring 533.
In a specific structure, the first tensioning mechanism 536 includes a first lower fixing ring 5361 and a first upper fixing ring 5364, a lower end surface of the first upper fixing ring 5364 is connected to a third spring 5363, a lower end of the third spring is connected to a first movable ring 5362, the first memory metal ring 535 is clamped by the first lower fixing ring 5361 and the first movable ring 5362, the second tensioning mechanism 538 includes a second lower fixing ring 5381 and a second upper fixing ring 5384, a lower end surface of the second upper fixing ring 5384 is connected to a fourth spring 5383, a lower end of the fourth spring 5383 is connected to a second movable ring 5382, and the second memory metal ring 537 is clamped by the second lower fixing ring 5381 and the second movable ring 5382. In the above-mentioned solution, the first tensioning mechanism 536 and the second tensioning mechanism 538 can tightly clamp the first memory metal ring 535 and the second memory metal ring 537, compensate for the axial displacement when the first memory metal ring 535 and the second memory metal ring 537 are deformed, and enable the first memory metal ring 535 and the second memory metal ring 537 to be stably inserted into or removed from the second insertion groove 2521 and the third insertion groove 2522.
The working principle and working process of the embodiment are as follows: in the initial state, the second sealing mechanism 5 is embedded at the upper abutting part of the male connector 1 and the female connector 2; at high temperature, after the temperature is increased to the deformation temperature of the first memory metal ring 535 and the second memory metal ring 537, the first memory metal ring 535 and the second memory metal ring 537 deform to be separated from the second embedded groove 2521 and the third embedded groove 2522, the sealing compression ring 531 is unlocked, the temperature is continuously increased to the deformation temperature of the expansion liquid and the memory spring 533, the expansion liquid expands, the volume is increased, the memory spring 533 stretches, and the two push the sealing compression ring 531 to move downwards together, so that the third graphite sealing ring 51 and the fourth graphite sealing ring 52 are tightly abutted against the male connector 1 and the female connector 2, the gap generated after the safety connector is heated is compensated, and the sealing effect is improved; after the exploitation is finished, the temperature is reduced, when the temperature is reduced below the deformation temperature of the expansion liquid and the memory spring 533, the expansion liquid is contracted, the memory spring 533 is shortened, the expansion liquid and the memory spring 533 together lift the sealing compression ring 531 to the initial position, and when the temperature is continuously reduced below the deformation temperature of the first memory metal ring 535 and the second memory metal ring 537, the first memory metal ring 535 and the second memory metal ring 537 are deformed and embedded into the second embedded groove 2521 and the third embedded groove 2522, so that the locking state of the sealing compression ring 531 is restored.
Example 4
With reference to fig. 1 to 7, this embodiment provides a method for using a safety joint, which is characterized by comprising the following steps:
step S100, embedding a first sealing mechanism 3 at the lower abutting position of the male connector 1 and the female connector 2, and embedding a second sealing mechanism 5 at the upper abutting position of the male connector 1 and the female connector 2; connecting the male connector 1 with a downstream pipe string, and connecting the female connector 2 with an upstream pipe string and then entering a preset position in a well;
step S200, when a dry-hot rock well is drilled, a safety joint made of metal is heated and axially stretched, an axial gap at the joint of the male joint 1 and the female joint 2 is increased, the first sealing mechanism 3 and the second sealing mechanism 5 are axially stretched, and the axial gap generated by high temperature is compensated, so that the first sealing mechanism 3 and the second sealing mechanism 5 are always tightly abutted with the male joint 1 and the female joint 2, and the sealing effect is improved;
and step 300, when the tripping is required, a torque force is provided for the upstream pipe string of the female connector 2, the female connector 2 rotates to be disconnected with the male connector 1, and the male connector 1 and the downstream pipe string are left in the pit.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the scope of the present invention.

Claims (10)

1. The utility model provides a safety joint, includes wide sawtooth threaded connection's public joint (1) and female joint (2), its characterized in that, first sealing mechanism (3) are inlayed in the lower butt department of public joint (1) and female joint (2), first sealing mechanism (3) are including first axial compensation piece (31), the up end of first axial compensation piece (31) is equipped with first graphite sealing ring (32), and the lower terminal surface is equipped with second graphite sealing ring (33), first axial compensation piece (31) can axial expansion.
2. The safety joint according to claim 1, wherein the male joint (1) comprises a circular first lower connecting end (11) and a first upper connecting end (12), the inner annular surface of the first lower connecting end (11) is provided with connecting threads, the upper end surface is provided with a first annular groove (13), the outer annular surface of the first upper connecting end (12) is provided with a sawtooth threaded part (14), the upper end surface is provided with a second annular groove (15), and a high-temperature-resistant sealing ring (4) is embedded above the outer side wall of the male joint (1); the female joint (2) comprises a circular second lower connecting end (21) and a second upper connecting end (22), a saw tooth thread groove (23) corresponding to the saw tooth thread part (14) is formed in the inner annular surface of the second lower connecting end (21), a first embedded groove (24) is formed in the lower end surface, an annular sealing sliding groove (25) is formed in the upper end surface, and connecting threads are formed in the outer annular surface of the second upper connecting end (22).
3. A safety joint according to claim 2, wherein the first axial compensation element (31) comprises a thermally elongated thermal expansion element (311), the upper end surface of the thermal expansion element (311) is connected with a first lifting ring (312), the lower end surface is connected with a second lifting ring (313), the first graphite sealing ring (32) and the second graphite sealing ring (33) both have L-shaped cross sections, the first graphite sealing ring (32) is embedded in a first embedding groove (24) at the lower butt of the female joint (2), and the second graphite sealing ring (33) is embedded in a first annular groove (13) at the lower butt of the male joint (1).
4. A safety joint according to claim 3, wherein the thermal expansion member (311) comprises a plurality of circumferentially equidistant piston cylinders (3111), first spacing protrusions (3112) and second spacing protrusions (3113) are axially arranged at intervals in the piston cylinders (3111), first pistons (3114) are arranged above the first spacing protrusions (3112), the first pistons (3114) are connected with first piston rods (3115), the first piston rods (3115) are connected with first lifting rings (312), first springs (3116) are sleeved on the first piston rods (3115), second pistons (3117) are arranged below the second spacing protrusions (3113), the second pistons (3117) are connected with second piston rods (3118), second pistons (3118) are connected with second lifting rings (313), second springs (3119) are sleeved on the second piston rods (3118), and thermal expansion liquid is arranged between the first pistons (3114) and the second pistons (3117).
5. The safety joint according to claim 4, wherein a second sealing mechanism (5) is embedded at the upper abutting part of the male joint (1) and the female joint (2), the second sealing mechanism (5) comprises a third graphite sealing ring (51) and a fourth graphite sealing ring (52) which are coaxially arranged at intervals, and upper end surfaces of the third graphite sealing ring (51) and the fourth graphite sealing ring (52) are provided with axial telescopic second axial compensation pieces (53).
6. The safety joint according to claim 5, wherein the second axial compensation member (53) comprises a sealing compression ring (531), the lower end surface of the sealing compression ring (531) compresses the third graphite sealing ring (51) and the fourth graphite sealing ring (52), the upper end surface is connected with an annular piston (532), the annular piston (532) is slidably arranged in a sealing chute (25) on the female joint (2), an expansion liquid is contained in a sealing cavity formed by the sealing compression ring and the annular piston (532), one ends of a plurality of memory springs (533) which are circumferentially and equidistantly arranged are fixed in the sealing chute (25), and the other ends of the memory springs are connected with the annular piston (532); annular piston (532) are T style of calligraphy cross-section, from top to bottom includes first sealing portion (5321), second sealing portion (5322) and sliding part (5323) in proper order, first sealing portion (5321) and second sealing portion (5322) interval set up, sealed spout (25) include spout (251) and lower spout (252), first sealing portion (5321) and second sealing portion (5322) are in go up spout (251) internal seal slip.
7. The safety joint according to claim 6, wherein the third graphite sealing ring (51) and the fourth graphite sealing ring (52) are arranged in a second annular groove (15) at the abutting position on the male joint (1), the third graphite sealing ring (51) and the fourth graphite sealing ring (52) are both provided with diamond-shaped cross sections, the upper end face and the lower end face of the third graphite sealing ring and the fourth graphite sealing ring together form a V-shaped structure, the lower end face of the sealing compression ring (531) is provided with a corresponding V-shaped cross section, and the second annular groove (15) is also provided with a corresponding V-shaped cross section.
8. The safety joint according to claim 7, wherein a connecting ring (534) is fixedly arranged on an upper end surface of the sealing compression ring (531), the upper end surface of the connecting ring (534) is connected with the annular piston (532), a first memory metal ring (535) and a first tensioning mechanism (536) are arranged on the outer side, a second memory metal ring (537) and a second tensioning mechanism (538) are arranged on the inner side, a second embedding groove (2521) is arranged on an outer groove wall of the lower sliding groove (252), a third embedding groove (2522) is arranged on an inner groove wall, the first memory metal ring (535) is embedded in the second embedding groove (2521), the second embedding groove (2521) is separated after being deformed by heating, the second memory metal ring (537) is embedded in the third embedding groove (2522), and the third embedding groove (2522) is separated after being deformed by heating.
9. The safety joint according to claim 8, wherein the first tensioning mechanism (536) comprises a first lower fixed ring (5361) and a first upper fixed ring (5364), a lower end surface of the first upper fixed ring (5364) is connected to a third spring (5363), a lower end of the third spring is connected to a first movable ring (5362), the first memory metal ring (535) is clamped by the first lower fixed ring (5361) and the first movable ring (5362), the second tensioning mechanism (538) comprises a second lower fixed ring (5381) and a second upper fixed ring (5384), a lower end surface of the second upper fixed ring (5384) is connected to a fourth spring (5383), a lower end of the fourth spring (5383) is connected to a second movable ring (5382), and the second memory metal ring (537) is clamped by the second lower fixed ring (5381) and the second movable ring (5382).
10. The method of using a safety joint according to claim 9, comprising the steps of:
step S100, embedding a first sealing mechanism (3) at the lower abutting position of the male connector (1) and the female connector (2), and embedding a second sealing mechanism (5) at the upper abutting position of the male connector (1) and the female connector (2); connecting the male connector (1) with the downstream pipe string, and connecting the female connector (2) with the upstream pipe string and then putting the pipe string into a preset position in the well;
step S200, when a dry-hot rock well is drilled, a safety joint made of metal is heated and axially stretched, an axial gap at the abutting position of a male joint (1) and a female joint (2) is increased, a first sealing mechanism (3) and a second sealing mechanism (5) are axially stretched, the axial gap generated by high temperature is compensated, the first sealing mechanism (3) and the second sealing mechanism (5) are always tightly abutted against the male joint (1) and the female joint (2), and the sealing effect is improved;
and step S300, when the tripping is required, a torque force is provided for the upstream pipe string of the female connector (2), the female connector (2) rotates to be disconnected with the male connector (1), and the male connector (1) and the downstream pipe string are left in the pit.
CN202310304260.7A 2023-03-27 2023-03-27 Safety joint and use method thereof Active CN116006096B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1417450A (en) * 2002-11-18 2003-05-14 陈月辉 Bayonet joint mechanism with automatic interval compensation
CN202325289U (en) * 2011-11-10 2012-07-11 杨宏伟 Thermal stress compensator
CN212272049U (en) * 2019-12-31 2021-01-01 山东华冠能源技术有限公司 Thermal recovery is compensation aggregate unit in pit
CN212584508U (en) * 2020-05-15 2021-02-23 上海未蓝工业技术有限公司 Rubber pipe joint for solving high-low temperature circulating leakage
CN114000850A (en) * 2021-12-31 2022-02-01 纬达石油装备有限公司 Straight-through type thermal recovery casing head and using method thereof
CN115654141A (en) * 2022-08-17 2023-01-31 西安航天动力研究所 Self-compensating ultrahigh-temperature sliding sealing device and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1417450A (en) * 2002-11-18 2003-05-14 陈月辉 Bayonet joint mechanism with automatic interval compensation
CN202325289U (en) * 2011-11-10 2012-07-11 杨宏伟 Thermal stress compensator
CN212272049U (en) * 2019-12-31 2021-01-01 山东华冠能源技术有限公司 Thermal recovery is compensation aggregate unit in pit
CN212584508U (en) * 2020-05-15 2021-02-23 上海未蓝工业技术有限公司 Rubber pipe joint for solving high-low temperature circulating leakage
CN114000850A (en) * 2021-12-31 2022-02-01 纬达石油装备有限公司 Straight-through type thermal recovery casing head and using method thereof
CN115654141A (en) * 2022-08-17 2023-01-31 西安航天动力研究所 Self-compensating ultrahigh-temperature sliding sealing device and method

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