CN114809940B - Safety connector - Google Patents
Safety connector Download PDFInfo
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- CN114809940B CN114809940B CN202110061508.2A CN202110061508A CN114809940B CN 114809940 B CN114809940 B CN 114809940B CN 202110061508 A CN202110061508 A CN 202110061508A CN 114809940 B CN114809940 B CN 114809940B
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- Prior art keywords
- annular
- groove
- annular piston
- joint
- piston
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Earth Drilling (AREA)
Abstract
本公开提供了一种安全接头，包括下接头、下接头和环状活塞，下接头的上端面具有环形凸起，环形凸起上具有第一过流孔；上接头和下接头通过第一销钉连接，上接头的下端面具有环形槽，环形槽的槽壁与下接头的外壁相互配合，形成环形腔，环形凸起位于环形腔中，环形槽的槽壁上具有开启孔和两个第二过流孔，且两个第二过流孔和第一过流孔相对；环状活塞位于环形凸起和环形槽的槽壁之间，环状活塞能在从开启孔注入的流体压力下从关闭位置移动到开启位置，关闭位置为隔断第一过流孔和第二过流孔的位置，开启位置为导通第一过流孔和第二过流孔的位置。本公开能在卡钻、埋钻时，将环空内的泥浆沉淀等杂质冲洗出井外，便于安全接头迅速解扣。
The present invention provides a safety joint, including a lower joint, a lower joint and an annular piston, wherein the upper end face of the lower joint has an annular protrusion, and the annular protrusion has a first flow hole; the upper joint and the lower joint are connected by a first pin, the lower end face of the upper joint has an annular groove, the groove wall of the annular groove cooperates with the outer wall of the lower joint to form an annular cavity, the annular protrusion is located in the annular cavity, the groove wall of the annular groove has an opening hole and two second flow holes, and the two second flow holes are opposite to the first flow hole; the annular piston is located between the annular protrusion and the groove wall of the annular groove, and the annular piston can move from a closed position to an open position under the pressure of the fluid injected from the opening hole, the closed position is a position to separate the first flow hole and the second flow hole, and the open position is a position to conduct the first flow hole and the second flow hole. The present invention can flush impurities such as mud sediment in the annulus out of the well when the drill is stuck or buried, so as to facilitate the rapid release of the safety joint.
Description
Technical Field
The disclosure relates to the technical field of oil and gas field development engineering, in particular to a safety joint.
Background
With the continuous breakthrough of natural gas exploration to the ultra-deep well field, the operation depth and the reservoir temperature are both increased, and the difficulty of oil gas development is also increased. During the development process of the oil-gas field, when the acidizing pipe column is started and started, slurry precipitation and well killing solid particles often block the annulus, and the complex conditions of sticking and burying the acidizing pipe column often occur. A safety joint is usually installed at the bottom of the drill rod, and is a tool for breaking the drill rod from the safety joint when the drill rod is stuck and buried, so as to take out part of the drill rod from the well.
The safety joint in the related art comprises an upper joint and a lower joint, wherein the lower joint is inserted into an inner hole of the upper joint, and the upper joint is connected with the lower joint through a pin. When the safety joint is required to be started, the drill rod is required to be lifted up and down at the wellhead, and the drill rod is controlled to rotate, so that a pin between the upper joint and the lower joint is sheared, and the drill rod can be taken out of the well.
However, after the drilling sticking and burying occur, if the standing time is long, the phenomena of mud precipitation, cementing and the like can occur at the annular positions of the drill rod, the sleeve, the safety joint and the sleeve because mud is not circulated for a long time, so that torque and lifting force cannot be transmitted to the safety joint, and the safety joint fails.
Disclosure of Invention
The embodiment of the disclosure provides a safety joint, which can wash out impurities such as slurry sediment in an annulus out of a well when drilling is stuck and buried, so that the safety joint can be quickly tripped to jack down a drill rod. The technical scheme is as follows:
The embodiment of the disclosure provides a safety joint, which comprises a lower joint, an upper joint and an upper joint, wherein the upper end face of the lower joint is provided with an axially extending annular bulge, the annular bulge is provided with a first overflow hole which radially penetrates through the annular bulge, the upper joint and the lower joint are connected through a first pin which is radially arranged, the lower end face of the upper joint is provided with an axially extending annular groove, the groove wall of the annular groove is matched with the outer wall of the lower joint to form a sealed annular cavity, the annular bulge is positioned in the annular cavity, the groove wall of the annular groove is provided with a radially extending opening hole and two second overflow holes, the two second overflow holes are radially opposite to the first overflow hole, an annular piston is positioned in the annular cavity and is radially positioned between the annular bulge and the groove wall of the annular groove, the annular piston is configured to move from a closing position to an opening position under the fluid pressure injected from the opening hole, the closing position is used for blocking the first overflow hole and the second overflow hole, and the opening position is used for conducting the first overflow hole and the first overflow hole.
In one implementation manner of the embodiment of the disclosure, an inner side wall of the annular protrusion is in sealing fit with a groove wall of the annular groove, the annular piston is located between an outer side wall of the annular protrusion and the other groove wall of the annular groove, the inner side wall and the outer side wall are two side walls of the annular protrusion, which are opposite to each other in the radial direction, the annular piston located at the closed position divides the annular cavity into a first cavity and a second cavity, and the opening hole is communicated with the second cavity.
In another implementation manner of the embodiment of the disclosure, the annular piston is in threaded connection with a groove wall of the annular groove or an outer side wall of the annular protrusion, the safety joint further comprises an impeller, the impeller is located in the second cavity, the impeller and the annular piston are coaxially arranged at intervals, the impeller is fixedly connected with the annular piston in the circumferential direction, and the impeller is located between the opening hole and the annular piston in the axial direction of the upper joint.
In another implementation manner of the embodiment of the disclosure, the annular piston and the impeller are connected through a connecting frame, the impeller comprises a rotating ring and rotating blades circumferentially arranged on the outer wall of the rotating ring, the connecting frame comprises a plurality of connecting rods circumferentially arranged at intervals, one end of each connecting rod is connected with one end of the rotating ring, and the other end of each connecting rod is connected with one end of the annular piston.
In another implementation manner of the embodiment of the disclosure, the safety joint further includes a torsion spring, the torsion spring is located in the first cavity and sleeved outside the annular protrusion, the torsion spring is located between the annular piston and the upper end face of the lower joint, one end of the torsion spring is circumferentially fixed with one end of the annular piston, and the other end of the torsion spring is circumferentially fixed with the annular protrusion.
In another implementation manner of the embodiment of the disclosure, the annular piston is in sliding sealing connection with the groove wall of the annular groove and the outer side wall of the annular protrusion, the safety joint further comprises a compression spring, the compression spring is located in the first cavity and sleeved outside the annular protrusion, the compression spring is located between the annular piston and the upper end face of the lower joint, one end of the compression spring abuts against one end of the annular piston, and the other end of the compression spring is axially fixed with the annular protrusion.
In another implementation manner of the embodiment of the disclosure, two annular grooves are respectively arranged on the inner wall and the outer wall of the annular piston at intervals in the axial direction, a sealing ring is arranged in the annular grooves, and when the annular piston is located at the closed position, the two annular grooves are located at two sides of the first overflow hole.
In another implementation of an embodiment of the present disclosure, the annular protrusion is connected with a groove wall of the annular groove by the first pin.
In another implementation of the disclosed embodiments, the annular piston is connected to the annular groove by a second pin.
In another implementation of the disclosed embodiments, a rupture disc is disposed within the opening aperture.
The technical scheme provided by the embodiment of the disclosure has the beneficial effects that at least:
In the safety joint provided by the embodiment of the disclosure, the annular piston is arranged in the sealed annular cavity formed by the plug-in assembly of the upper joint and the lower joint, and the annular piston is in sealing fit with the annular bulge and the annular piston is in sealing fit with the annular groove, so that the annular piston can separate the first overflow hole and the second overflow hole in an initial state, and leakage of liquid outside the safety joint or the liquid overflow hole in the safety joint is avoided. If the drilling rod is stuck or buried in the construction process, and mud precipitation occurs in the annular space between the safety joint and the sleeve, at the moment, liquid can be injected into the annular space between the drilling rod and the sleeve from the wellhead to be pressurized, after the liquid reaches the safety joint, the liquid enters the annular cavity through the opening hole and pushes the annular piston positioned in the annular cavity to move, so that the annular piston exposes the first overflow hole and the second overflow hole to conduct the two overflow holes, and the liquid in the annular space can enter the safety joint through the two overflow holes. After the slurry in the annulus is cleaned, the slurry can be carried into the safety joint together, and the slurry is returned to the wellhead through the drill rod, so that the well cleaning operation is completed. At this time, the annular space of the drill rod, the safety joint and the sleeve is not precipitated with mud, so that when a technician operates the drill rod to lift and rotate up and down at the wellhead, lifting force and torque can be easily transmitted to the safety joint to ensure that the safety joint can rapidly complete tripping, and the drill rod is taken out to avoid economic loss.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of a plugging state of a safety joint according to an embodiment of the disclosure;
FIG. 2 is a schematic view of an open state of a safety joint according to an embodiment of the disclosure;
FIG. 3 is a schematic structural view of a safety joint according to an embodiment of the present disclosure;
fig. 4 is a schematic structural view of a safety joint according to an embodiment of the present disclosure.
The reference numerals in the figures are described as follows:
1-an upper joint, 10-an annular groove, 11-a second overflow hole and 12-an opening hole;
2-lower joint, 21-annular bulge, 22-first overflow hole;
30-annular pistons, 31-impellers, 311-rotating rings, 312-rotating blades, 32-connecting frames, 33-torsion springs, 34-sealing rings and 35-compression springs;
41-first pin, 42-second pin, 43-rupture disc;
5-annular cavity, 51-first cavity, 52-second cavity.
Detailed Description
For the purposes of clarity, technical solutions and advantages of the present disclosure, the following further details the embodiments of the present disclosure with reference to the accompanying drawings.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," "third," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, is intended to mean that elements or items that are present in front of "comprising" or "comprising" are included in the word "comprising" or "comprising", and equivalents thereof, without excluding other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", "top", "bottom" and the like are used only to indicate relative positional relationships, which may be changed accordingly when the absolute position of the object to be described is changed.
Fig. 1 is a schematic diagram of a plugging state of a safety joint according to an embodiment of the disclosure. As shown in fig. 1, the safety joint includes an upper joint 1, a lower joint 2, and an annular piston 30.
As shown in fig. 1, the upper end surface of the lower joint 2 has an axially extending annular projection 21, and the annular projection 21 has a first flow passage 22 radially penetrating the annular projection 21.
As shown in fig. 1, the upper joint 1 and the lower joint 2 are connected by a first pin 41 which is arranged radially, the lower end surface of the upper joint 1 is provided with an annular groove 10 which extends axially, the groove wall of the annular groove 10 is matched with the outer wall of the lower joint 2 to form a sealed annular cavity 5, an annular bulge 21 is positioned in the annular cavity 5, the groove wall of the annular groove 10 is provided with an opening hole 12 which extends radially and two second overflowing holes 11, and the two second overflowing holes 11 and the first overflowing hole 22 are opposite in radial direction.
As shown in fig. 1, the annular piston 30 is located within the annular chamber 5 and radially between the annular projection 21 and the groove wall of the annular groove 10.
Fig. 2 is a schematic diagram illustrating an open state of a safety joint according to an embodiment of the disclosure. As shown in fig. 1 and 2, the annular piston 30 is configured to move from a closed position, which is a position to block the first and second through-flow holes 22 and 11, to an open position, which is a position to communicate the first and second through-flow holes 22 and 11, under the pressure of fluid injected from the open hole 12.
The safety joint provided by the embodiment of the disclosure comprises an upper joint 1, a lower joint 2 and an annular piston 30, wherein an annular protrusion 21 on the upper end surface of the lower joint 2 is coaxially inserted into an annular groove 10 on the lower end surface of the upper joint 1, and the upper joint 1 and the lower joint 2 are connected through a first pin 41. The upper joint 1 has two second overflow holes 11 on the groove wall penetrating the annular groove 10 of the upper joint 1, and the lower joint 2 also has a first overflow hole 22 penetrating the annular protrusion 21 of the lower joint 2, the first overflow hole 22 and the second overflow hole 11 are opposite in radial direction, so that the liquid outside the safety joint can enter the safety joint through the second overflow hole 11, the annular groove 10, the second overflow hole 11 and the first overflow hole 22 in sequence. An annular piston 30 which can move axially is arranged between the annular bulge 21 and the groove wall of the annular groove 10, the annular piston 30 is used for blocking the first overflow hole 22 and the second overflow hole 11 when in an opening position, and the annular piston 30 is in sealing fit with the annular bulge 21 and the annular groove 10, namely, the annular piston 30 cannot move easily in the annular groove 10 under the action of no external force, so that liquid outside the safety joint or liquid in the safety joint can be prevented from leaking out of the overflow hole.
If the drill rod is stuck or buried in the construction process, mud precipitation occurs in the annular space of the safety joint and the casing. At this time, the annular space between the drill rod and the casing is injected with liquid from the wellhead to be pressurized, after the liquid reaches the safety joint, the liquid enters the annular groove 10 through the opening hole 12 and pushes the annular piston 30 positioned in the annular groove 10 to move downwards, so that the annular piston 30 exposes the second overflow hole 11 and the first overflow hole 22 to conduct the two overflow holes, and the liquid in the annular space can enter the safety joint through the two overflow holes. After the slurry in the annulus is cleaned, the slurry can be carried into the safety joint together, and the slurry is returned to the wellhead through the drill rod, so that the well cleaning operation is completed. At this time, the annular space of the drill rod, the safety joint and the sleeve is not precipitated with mud, so that when a technician operates the drill rod to lift and rotate up and down at the wellhead, lifting force and torque can be easily transmitted to the safety joint to ensure that the safety joint can rapidly complete tripping, and the drill rod is taken out to avoid economic loss.
Optionally, as shown in FIG. 1, a rupture disc 43 is disposed within opening bore 12. Rupture disc 43 is a tool that ruptures itself when subjected to a pressure exceeding a pressure limit to effect pressure relief. By providing a rupture disc 43 in the opening 12, the annular piston 30 is prevented from accidentally sliding by the liquid in the annulus entering the annular groove 10, which results in the passage of two flow-through apertures of the safety arrangement, so as to avoid pressure relief of the safety joint.
Wherein rupture disc 43 is a disc-like structure having both an inner surface and an outer surface that are spherical, the peripheral edge of rupture disc 43 is attached to the inner wall of opening hole 12 to secure rupture disc 43 within opening hole 12. And the convex surface of the rupture disc 43 faces the annulus between the casing and the safety joint so that the rupture disc 43 can withstand greater pressures. In use, fluid is injected from the wellhead into the annulus between the safety joint and the casing and pressurized, and when the pressure in the annulus exceeds the pressure limit of the rupture disc 43, the rupture disc 43 is ruptured allowing fluid in the annulus to enter the annular groove 10 through the opening hole 12.
Alternatively, as shown in fig. 1, the annular projection 21 is connected with the groove wall of the annular groove 10 by a first pin 41. I.e. the first pin 41 is also arranged in the annular groove 10 to avoid erosion by arranging the first pin 41 on the inner or outer walls of the upper and lower joints, in direct contact with the air in the external environment or the liquid in the pipe string.
Illustratively, there are a plurality of first pins 41 for connecting the upper joint 1 and the lower joint 2, and the plurality of first pins 41 are circumferentially spaced apart, so that the upper joint 1 and the lower joint 2 are stressed at various positions in the circumferential direction, to avoid the upper joint 1 and the lower joint 2 from accidentally falling off, and to improve the connection reliability.
Alternatively, as shown in fig. 1 and 2, the inner side wall of the annular protrusion 21 is in sealing fit with one groove wall of the annular groove 10, the annular piston 30 is located between the outer side wall of the annular protrusion 21 and the other groove wall of the annular groove 10, the inner side wall and the outer side wall are two radially opposite side walls of the annular protrusion 21, the annular piston 30 in the closed position divides the annular cavity 5 into a first cavity 51 and a second cavity 52, and the opening hole 12 is communicated with the second cavity 52.
In the embodiment of the disclosure, the annular piston 30 is sleeved outside the annular protrusion 21, and the inner side wall of the annular piston 30 is attached to the outer side wall of the annular protrusion 21, and the outer side wall of the annular piston 30 is attached to the groove wall of the annular groove 10, so that when the annular piston 30 moves between the first overflow hole 22 and the second overflow hole 11, that is, when the annular piston 30 moves to the closed position, the annular piston 30 can perform preliminary sealing on the two overflow holes.
When the annular piston 30 is in the closed position, the annular chamber 5 is divided into a first chamber 51 and a second chamber 52, so that after the liquid enters the second chamber 52 through the opening hole 12, the liquid can be pressed in the second chamber 52, and the annular piston 30 is pushed to move towards the first chamber 51, so that the space of the first chamber 51 is reduced, the first overflow hole 22 and the second overflow hole 11 are communicated, and the annular piston 30 is moved to the open position.
In other implementations of the present disclosure, neither the inner side wall nor the outer side wall of the annular projection 21 may be in sealing engagement with the groove wall of the annular groove 10, i.e., the annular projection 21 and the groove wall of the annular groove 10 are inserted with a gap therebetween within the annular groove 10.
At this time, the lower end surface of the upper joint 1 may be in sealing engagement with the upper end surface of the lower joint 2, or the groove wall of the annular groove 10 may be in sealing engagement with the outer side wall of the lower joint 2, so that the groove wall of the annular groove 10 and the outer wall of the lower joint 2 cooperate with each other to form the sealed annular cavity 5.
Fig. 3 is a schematic structural view of a safety joint according to an embodiment of the present disclosure. As shown in fig. 3, the annular piston 30 may be a metal cylindrical structure, and the annular piston 30 is slidably inserted between the groove wall of the annular groove 10 and the annular protrusion 21. Wherein, the inner wall and the outer wall of the annular piston 30 are respectively provided with two annular grooves which are axially arranged at intervals, the annular grooves are internally provided with sealing rings 34, and the axial arrangement interval of the annular grooves is not smaller than the largest diameter of the second overflow hole 11 and the first overflow hole 22, so that when the annular piston 30 is positioned at the closed position, the two annular grooves are positioned at two sides of the first overflow hole 22.
Wherein, the inner wall and the outer wall of the annular piston 30 are smooth, so that after the annular piston 30 is inserted into the annular space between the annular groove 10 and the annular bulge 21, the annular piston 30 has smaller friction force with the annular groove 10 and the annular bulge 21, and the annular piston 30 can slide axially conveniently.
In order to ensure the sealability between the annular piston 30 and the annular groove 10 and the annular projection 21, annular grooves are provided on the inner wall and the outer wall of the annular piston 30, and sealing rings 34 are installed in the annular grooves, and the axial distance between the two annular grooves is equal to or greater than the diameter of the larger diameter of the first overflow hole 22 and the second overflow hole 11, so that it is ensured that the first overflow hole 22 and the second overflow hole 11 are both positioned between the two sealing rings 34, so that the leakage of liquid from the gap between the annular piston 30 and the groove wall of the annular groove 10 and the gap between the annular piston 30 and the side wall of the annular projection 21 is avoided, and the sealability is improved.
Optionally, the safety joint may further comprise a return member for providing a force to the annular piston 30 for returning the annular piston 30 to the closed position when the annular piston 30 is moved from the closed position to the open position.
Illustratively, as shown in fig. 3, the restoring member is a compression spring 35, the compression spring 35 is located in the first cavity 51 and sleeved outside the annular protrusion 21, the compression spring 35 is located between the annular piston 30 and the upper end surface of the lower joint 2, one end of the compression spring 35 abuts against one end of the annular piston 30, and the other end of the compression spring 35 is axially fixed with the annular protrusion 21.
The outer side wall of the annular protrusion 21 is provided with an outer flange, the lower end of the compression spring 35 abuts against the end face of the outer flange, and the upper end of the compression spring 35 abuts against the lower end of the annular piston 30, so that when the liquid breaks the rupture disc 43 and enters the annular cavity 5 from the opening hole 12, if the pressure of the liquid is enough to overcome the elasticity of the compression spring 35, the liquid pushes the annular piston 30 to move downwards, so that the annular piston 30 slides to the lower parts of the second overflow hole 11 and the first overflow hole 22 (namely, the annular piston 30 moves to the opening position), and the second overflow hole 11 and the first overflow hole 22 are conducted, so that the liquid can enter the safety joint from the annular space, and well flushing operation is realized.
In addition, in the above process, the compression spring 35 is compressed and stores the elastic force, so that after the well flushing operation is completed, no liquid is injected into the annulus, the pressure exerted on the annular piston 30 and the compression spring 35 by the liquid disappears, and the annular piston 30 slides upwards under the action of the elastic force of the compression spring 35, so that the annular piston 30 moves to the closed position, and the first overflow hole 22 and the second overflow hole 11 are plugged again, so that the liquid leakage in the drill rod is avoided.
Alternatively, as shown in fig. 1, the annular piston 30 is connected to the annular groove 10 by a second pin 42. The situation that the annular liquid enters the annular cavity 5 through the opening hole 12 and pushes the annular piston 30 to cause accidental conduction of the first overflow hole 22 and the second overflow hole 11 is avoided, and the reliability of the safety joint is improved.
As shown in fig. 1, there are a plurality of second pins 42 for connecting the annular piston 30 and the annular groove 10, and the plurality of second pins 42 are circumferentially spaced apart, so that the annular piston 30 and the annular groove 10 are stressed at various positions in the circumferential direction, to avoid accidental falling of the annular piston 30 and the annular groove 10, and to improve connection reliability.
Fig. 4 is a schematic structural view of a safety joint according to an embodiment of the present disclosure. The safety joint shown in fig. 4 is identical to the safety joint shown in fig. 3 in terms of the shape and structure of the upper joint 1 and the lower joint 2, and the connection relationship and arrangement positions of the annular projection 21 and the annular groove 10 are identical. The annular pistons 30 are each disposed between the groove wall of the annular groove 10 and the side wall of the annular projection 21. The difference is the way in which the annular piston 30 engages the annular groove 10, the annular projection 21 in the annular chamber 5.
As shown in fig. 4, the annular piston 30 is screwed with the annular groove 10 or the annular protrusion 21, and the safety joint may include an impeller 31, the impeller 31 being located in the second cavity 52, the impeller 31 being arranged at a coaxial interval with the annular piston 30, and the impeller 31 being circumferentially fixed with the annular piston 30, the impeller 31 being located between the opening hole 12 and the annular piston 30 in the axial direction of the upper joint 1.
Wherein, the impeller 31 may include a rotating ring 311 and rotating blades 312 circumferentially arranged on an outer wall of the rotating ring 311, when the liquid flows from one side of the impeller 31 to the impeller 31, after passing through the impeller 31, since the impeller 31 and the annular piston 30 are spaced apart, that is, the impeller 31 and the annular piston 30 have a gap, so that the fluid can continue to flow, that is, the liquid drives the rotating blades 312 of the impeller 31 to rotate, thereby driving the rotating ring 311 to rotate together. I.e. the impeller 31 can be rotated under the impact of the liquid.
As shown in fig. 4, since the impeller 31 is located in the annular groove 10 below the opening, when the liquid in the annulus passes through the opening hole 12, the liquid flows downward toward the impeller 31, the impeller 31 starts to rotate under the impact of the liquid to drive the annular piston 30 to rotate, and since the annular piston 30 is screwed with the annular groove 10 or the annular protrusion 21, the annular piston 30 slides axially in the annular groove 10, so that the annular piston 30 can move to a position where the first and second overflow holes 22 and 11 are communicated to facilitate flushing.
In the embodiment of the disclosure, the inner wall of the annular piston 30 and the outer peripheral wall of the annular protrusion 21 are provided with mutually matched threads, and the thread shape of the threads can be trapezoidal threads, so that the sealing performance between the annular piston 30 and the annular protrusion 21 is ensured, and meanwhile, the annular piston 30 and the annular protrusion 21 can rotate conveniently.
Optionally, the safety joint may further comprise a return member for providing a force to the annular piston 30 for returning the annular piston 30 to the closed position when the annular piston 30 is moved from the closed position to the open position.
Alternatively, as shown in fig. 4, the restoring member is a torsion spring 33, the torsion spring 33 is located in the first cavity 51 and sleeved outside the annular protrusion 21, the torsion spring 33 is located between the annular piston 30 and the upper end surface of the lower joint 2, one end of the torsion spring 33 is circumferentially fixed with one end of the annular piston 30, and the other end of the torsion spring 33 is circumferentially fixed with the annular protrusion 21.
Wherein, openings can be arranged on the lower end surface of the annular piston 30 and the outer side wall of the annular bulge 21 so as to facilitate the end part of the torsion spring 33 to be inserted into the openings, thereby ensuring that both ends of the torsion spring 33 are circumferentially fixed.
Thus, when the liquid breaks the rupture disc 43 and enters the annular cavity 5 from the opening hole 12, if the liquid drives the impeller 31 to rotate so as to drive the annular piston 30 to rotate, the annular piston 30 moves downwards under the action of the screw pair, so that the annular piston 30 slides to the lower parts of the second overflow hole 11 and the first overflow hole 22 (i.e. the annular piston 30 moves to the opening position), thereby conducting the second overflow hole 11 and the first overflow hole 22, and enabling the liquid to enter the safety joint from the annular space, so as to realize well flushing operation. And, the torsion spring 33 is twisted and accumulates torque, so that after the well-flushing operation is completed, no liquid is injected into the annulus, the pressure exerted on the annular piston 30 and the torsion spring 33 by the liquid is reduced, the annular piston 30 rotates under the action of the torque exerted by the torsion spring 33, and the annular piston 30 moves upwards under the action of the screw pair, thereby blocking the first and second through-flow holes 22 and 11 again, so as to avoid liquid leakage in the drill pipe.
Alternatively, as shown in fig. 4, the annular piston 30 and the impeller 31 are connected by a connecting frame 32, the connecting frame 32 includes a plurality of connecting rods arranged at intervals in the circumferential direction, the impeller 31 includes a rotating ring 311 and rotating blades 312 arranged at the outer wall of the rotating ring 311 in the circumferential direction, one end of the connecting rod is connected with one end of the rotating ring 311, and the other end of the connecting rod is connected with one end of the annular piston 30. By arranging a plurality of connecting rods, the connection reliability can be improved, and liquid flowing into the annular cavity 5 can be prevented from being separated by the connecting frame 32, so that after the two overflow holes are conducted, the liquid in the annular groove 10 can be smoothly discharged.
The safety joint provided by the embodiment of the disclosure can set the starting pressure according to the well depth and the temperature, when the tripping is needed, the starting pressure is pressurized to the starting pressure, the rupture disc 43 is broken, the annular piston 30 moves downwards, two overflow holes can be conducted to realize positive and negative circulation, the bottom slurry is washed, then the operation of lifting and rotating the drill rod up and down is carried out to shear the first pin 41 to finish the tripping, the starting pressure can be set to be far higher than the normal construction pressure in the normal acid fracturing test, the safety joint is ensured not to be started easily, and the normal operations of lowering, acid fracturing, unsealing and the like of an acid fracturing tubular column are ensured. Compared with the conventional mechanical safety structure, the novel hydraulic control safety structure is easy to back-buckle, does not need to throw balls compared with other hydraulic control safety connectors, and reduces underground risks. The first pin 41 effectively ensures that the forward and reverse rotation pipe column operation in construction cannot operate the safety joint by mistake, and is convenient for site construction. And the bottom mud is washed and circulated before the back-off, so that the torque and the lifting force can be transmitted to the safety joint, and the success rate of the back-off is greatly improved.
The foregoing disclosure is not intended to be limited to any form of embodiment, but is not intended to limit the disclosure, and any simple modification, equivalent changes and adaptations of the embodiments according to the technical principles of the disclosure are intended to be within the scope of the disclosure, as long as the modifications or equivalent embodiments are possible using the technical principles of the disclosure without departing from the scope of the disclosure.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110061508.2A CN114809940B (en) | 2021-01-18 | 2021-01-18 | Safety connector |
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| CN202110061508.2A CN114809940B (en) | 2021-01-18 | 2021-01-18 | Safety connector |
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| CN114809940A CN114809940A (en) | 2022-07-29 |
| CN114809940B true CN114809940B (en) | 2025-02-25 |
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| CN107558933A (en) * | 2017-09-15 | 2018-01-09 | 刘玉友 | Safety joint under a kind of fluffing of moulding sand formula oil well |
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| US6527048B1 (en) * | 2001-02-12 | 2003-03-04 | David J. Trosclair | Hydraulically actuated downhole coupler system, especially for combination washover/fishing tool assemblies |
| CN2600580Y (en) * | 2003-01-18 | 2004-01-21 | 王敏捷 | Temp. control flushing packer |
| RU2441140C2 (en) * | 2009-11-30 | 2012-01-27 | Открытое акционерное общество "Акционерная нефтяная компания "Башнефть" (ОАО "АНК "Башнефть") | Device for hanger lowering and cementing of casing liner in well |
| CN201891404U (en) * | 2010-07-22 | 2011-07-06 | 北京金科龙石油技术开发有限公司 | Left-hand threaded packer |
| CN202441320U (en) * | 2011-10-18 | 2012-09-19 | 中国石油化工股份有限公司 | Well flushing high pressure packer |
| CN107558951A (en) * | 2017-09-29 | 2018-01-09 | 中国石油天然气股份有限公司 | Hydraulic switch circulating sliding sleeve |
| CN208220657U (en) * | 2017-12-29 | 2018-12-11 | 中国石油天然气股份有限公司 | Safety joint |
| CN110056321A (en) * | 2019-05-28 | 2019-07-26 | 成都阿斯贝瑞科技有限公司 | A kind of fluid excitation formula Infinite Cyclic well-flushing tool and its application method |
| CN210918981U (en) * | 2019-09-04 | 2020-07-03 | 中国石油化工股份有限公司 | Novel underground agent injection valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053279A (en) * | 1989-10-09 | 1991-07-24 | 加利福亚尼联合石油公司 | Hydraulic release oil tool |
| CN107558933A (en) * | 2017-09-15 | 2018-01-09 | 刘玉友 | Safety joint under a kind of fluffing of moulding sand formula oil well |
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| CN114809940A (en) | 2022-07-29 |
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