Releasing type leaking stoppage auxiliary device

Abstract

The invention relates to the technical field of underground leaking stoppage, and discloses a releasing type leaking stoppage auxiliary device. The releasing type leaking stoppage auxiliary device comprises a connector connected with a drill rod and a conveying pipe rotationally connected with the connector, at least one cutting assembly is arranged on the connector, and the cutting assemblies can stretch out of the side wall of the connector and penetrate through the conveying pipe when the internal pressure of the connector reaches the preset pressure, the connector can be driven by the drill rod to rotate relative to the conveying pipe so as to annularly cut the conveying pipe, and the cut conveying pipe can be separated from the connector. When the releasing type leaking stoppage auxiliary device is used, the conveying pipe is connected with the drill rod through the connector, the conveying pipe can be lowered to the position above a leaking stoppage layer by the drill rod, it is ensured that leaking stoppage slurry can be accurately conveyed to the leaking layer, the plugging effect is ensured, and the plugging effect is improved; and after plugging is completed, the cutting assembly annularly cuts the conveying pipe, the cut conveying pipe is separated from the connector, and the drill rod can be normally tripped.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole plugging, in particular to a lost circulation auxiliary device. BACKGROUND

[0002] In recent years, due to the strong permeability of the formation, the development of faults and fractures, the complex pressure system, the large span of drilling fluid density used and other reasons, the well leakage problem is prominent.

[0003] In the face of increasingly complex plugging problems, cement and consolidation plugging as a kind of efficient plugging method has been widely used in recent years. Among them, cement plugging has the characteristics of high pressure capacity and compression strength, and the plugging effect is good, which can adapt to the needs of various leakage channels. Cement plugging can solve the problem of serious well leakage, and the technology is mature and widely used. In addition, consolidation plugging is mainly divided into high water loss consolidation plugging and chemical consolidation plugging: high water loss consolidation plugging loses water rapidly under the pressure difference between liquid column pressure and formation pressure after entering the leakage layer, and the solid phase components in the plugging slurry continuously aggregate, thicken and form a filter cake, which further compacts and plugs the leakage channel to achieve the effect of plugging; chemical consolidation plugging as a temperature control type pressure plugging technology can effectively solve the problem of well leakage in long open hole and multi-pressure system, and the plugging slurry gradually solidifies under the action of formation temperature to realize the solidification and plugging of the leakage layer. Compared with cement plugging, the solidified plug formed by chemical consolidation plugging has good drillability and is easy to process in the later stage of wellbore drilling plug, and will not form a new wellbore.

[0004] However, since the current plugging method uses the characteristics of solidification to plug the leakage layer, and the solidified plugging slurry has certain strength characteristics, if the drilling tool is far away from the plugging layer, a large amount of plugging slurry needs to be pumped, and the plugging slurry cannot accurately plug the leakage layer, resulting in poor plugging effect; if the distance from the plugging layer is close, the solidified plugging slurry is easy to fix the drilling tool, resulting in the inability to drill or repeated tripping, which causes disturbance of the un-solidified plugging slurry and affects the plugging effect. SUMMARY

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a lost circulation auxiliary device.

[0006] The present application provides a lost circulation auxiliary device, which comprises a joint connected with a drill pipe and a conveying pipe rotationally connected with the joint, at least one cutting assembly is arranged on the joint, the cutting assembly can extend out of the side wall of the joint and penetrate the conveying pipe when the internal pressure of the joint reaches a preset pressure, wherein the joint can rotate relative to the conveying pipe under the driving of the drill pipe to cut the conveying pipe in a ring shape, and the cut conveying pipe is separated from the joint.

[0007] Optionally, an inner part of the joint is provided with a ball seat hole for receiving a ball, the ball falling into the ball seat hole can separate the inner cavity of the joint, and the cutting assembly is located on a side of the ball seat hole facing the drill pipe.

[0008] Optionally, an inner wall of the joint is provided with an annular protrusion, a first tapered surface is arranged on a side of the annular protrusion facing the drill pipe to form the ball seat hole.

[0009] Optionally, a side of the cutting assembly away from the ball seat hole is provided with a second tapered surface.

[0010] Optionally, a side wall of the joint is provided with a through hole, the cutting assembly comprises a piston cutter arranged in the through hole, and the piston cutter does not normally extend out of the through hole.

[0011] Optionally, the piston cutter comprises a piston seat and a cutter head arranged on the piston seat, and a cutting edge of the cutter head is arranged along a circumferential direction of the delivery pipe.

[0012] Optionally, the through hole is a stepped hole comprising a first hole arranged on an inner side of the joint and a second hole arranged on an outer side of the joint, a diameter of the first hole is greater than a diameter of the second hole, and the piston seat is arranged in the first hole in a sliding manner.

[0013] Optionally, an inner side of the piston cutter is provided with a retaining ring, an outer periphery of the retaining ring extends out of an outer periphery of the piston cutter, an inner side of the through hole is provided with a third hole for accommodating the retaining ring, the third hole is provided with an annular cutter, and the part of the retaining ring extending out of the piston cutter can be cut off by the annular cutter when an inner pressure of the joint reaches the preset pressure.

[0014] Optionally, a sealing member is arranged between the piston seat and an inner wall of the through hole.

[0015] Optionally, the joint comprises a first body for connecting with the drill pipe and a second body connected with the first body, a diameter of the second body is smaller than a diameter of the first body, the delivery pipe is sleeved on an outer periphery of the second body, and the cutting assembly is arranged on the second body.

[0016] Optionally, an outer periphery of the joint is provided with a snap ring, and the delivery pipe is provided with an annular clamping groove matched with the snap ring.

[0017] Optionally, the delivery pipe is a high-pressure hose.

[0018] Optionally, the high-pressure hose comprises an inner pipe, a sealing layer, a skeleton layer and an outer pipe arranged in sequence from inside to outside.

[0019] Optionally, the inner tube comprises a smooth coating layer and a silicone rubber layer arranged in sequence from inside to outside;

[0020] And / or, the framework layer is made of metal fiber wire knitting;

[0021] And / or, the outer tube comprises a ternary ethylene-propylene rubber layer, a composite layer and a wear-resistant coating layer arranged in sequence from inside to outside.

[0022] The technical scheme provided by the embodiment of the present application has the following advantages compared with the prior art:

[0023] The releasing type leak stoppage auxiliary device provided by the present application is used, the conveying pipe is connected with the drill pipe through the joint, and the conveying pipe can be lowered to the upper side of the leak layer by the drill pipe, so that the leak stoppage slurry can be accurately conveyed to the leak layer, the sealing effect is ensured, and the sealing effect is improved; after sealing is completed, the pressure in the joint is increased, the cutting assembly extends from the side wall of the joint and penetrates the conveying pipe, the joint is driven to rotate by the drill pipe, the cutting assembly annularly cuts the conveying pipe, and the cut conveying pipe is separated from the joint, the drill pipe can be normally tripped in and out, the conveying pipe remaining in the well is broken under the cutting action of the subsequent drill bit, and is circulated to the ground with the drilling fluid, so that the subsequent safe drilling is not affected, the problem that the position of the slurry conveying is close to the leak layer and the drill pipe cannot be tripped in and out is solved, and the sealing effect of the leak stoppage slurry is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the accompanying drawings required to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other accompanying drawings can also be obtained by those skilled in the art without any creative effort on the basis of these accompanying drawings.

[0026] Figure 1 A structure schematic view of the releasing type leak stoppage auxiliary device is shown in the figure.

[0027] Figure 2 A structure schematic view of the releasing type leak stoppage auxiliary device when the cutting assembly extends is shown in the figure.

[0028] Figure 3 A structure schematic view of the releasing type leak stoppage auxiliary device when the cutting assembly extends is shown in the figure. Figure 1 An enlarged view of A in the figure.

[0029] Figure 4 A sectional view of the conveying pipe is shown in the figure.

[0030] DETAILED DESCRIPTION

[0031] 1, joint; 11, ball seat hole; 12, annular protrusion; 121, first tapered surface; 13, second tapered surface; 14, through hole; 141, first hole; 142, second hole; 143, third hole; 1431, annular cutter; 15, first body; 16, second body; 17, snap ring; 2, delivery pipe; 21, high-pressure hose; 211, inner tube; 212, sealing layer; 213, skeleton layer; 214, outer tube; 3, cutting assembly; 31, piston cutter; 311, piston seat; 312, cutter head; 313, retaining ring; 4, ball; 5, sealing element. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the following will further describe the solutions of the present application. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other different manners from those described herein; obviously, the embodiments described in the specification are only a part of the embodiments of the present application, rather than all the embodiments.

[0034] In combination with Figure 1 and Figure 2 shown, the lost circulation auxiliary device provided by the embodiments of the present application comprises a joint 1 connected with a drill pipe and a delivery pipe 2 rotationally connected with the joint 1, specifically, one end of the joint 1 is connected with the drill pipe, the delivery pipe 2 is connected with the end of the joint 1 away from the drill pipe, and the delivery pipe 2 is rotationally matched with the joint 1. At least one cutting assembly 3 is arranged on the joint 1, and the cutting assembly 3 can extend out of the side wall of the joint 1 and penetrate the delivery pipe 2 when the internal pressure of the joint 1 reaches a preset pressure, wherein the joint 1 can rotate relative to the delivery pipe 2 under the driving of the drill pipe to cut the delivery pipe 2 in a ring shape, and the cut delivery pipe 2 is separated from the joint 1. During the delivery of the lost circulation slurry (non-cutting state), the cutting assembly 3 is retracted in the interior of the joint 1, that is, the cutting assembly 3 will not be withdrawn under normal internal pressure of the pipe, so as to avoid scratching the delivery pipe 2. After the delivery of the lost circulation slurry is completed, the internal pressure of the joint 1 is increased, and when the internal pressure of the joint 1 is greater than the preset pressure, the cutting assembly 3 extends out to cut the delivery pipe 2 in rotation.

[0035] The hand-releasing type plugging auxiliary device provided by the application is used for connecting the delivery pipe 2 and the drill rod through the joint 1, and the delivery pipe 2 can be lowered by the drill rod to the upper side of the plugging layer, so that the plugging slurry can be accurately delivered to the leaking layer, the plugging effect is ensured, and the plugging effect is improved; after the plugging is completed, the pressure inside the joint 1 is increased, so that the cutting assembly 3 extends out of the side wall of the joint 1 and penetrates the delivery pipe 2, the joint 1 is driven to rotate by the drill rod, so that the cutting assembly 3 annularly cuts the delivery pipe 2, and the cut delivery pipe 2 is separated from the joint 1, the drill rod can be normally tripped in and out, the delivery pipe 2 remaining in the well is broken under the cutting action of the subsequent drill bit and is circulated to the ground along with the drilling fluid, and the subsequent safe drilling is not affected, so that the problem that the delivery position is close to the leaking layer and the drill rod cannot be tripped in and out is solved, and the plugging effect of the plugging slurry is not affected.

[0036] In some embodiments, in combination with Figure 1 and Figure 2 As shown in the drawings, the inside of the joint 1 is provided with a ball seat hole 11 for receiving the ball 4, the ball 4 falling into the ball seat hole 11 can separate the inner cavity of the joint 1, that is, the ball seat hole 11 is matched with the ball 4, so that after the ball 4 falls into the ball seat hole 11, the ball seat hole 11 can hold the ball 4, and the ball 4 is attached to the inner wall of the ball seat hole 11, so that the plugging effect is ensured. The cutting assembly 3 is located on the side of the joint 1 facing the drill rod, after the ball 4 seals the inner wall of the joint 1, the cutting assembly 3 is located on the pressurized side of the joint 1, and as the drilling fluid continues to be injected, the high-pressure drilling fluid can act on the inner side of the cutting assembly 3, so that the cutting assembly 3 can extend out of the joint 1.

[0037] Specifically, after the plugging slurry is delivered, the drilling fluid is delivered in the drill rod, the ball 4 moves along with the flow of the drilling fluid, until the ball 4 falls into the ball seat hole 11, and the inner cavity of the joint 1 is separated by the ball 4, at this time, as the drilling fluid is injected, the pressure inside the joint 1 gradually increases, until the internal pressure of the joint 1 reaches the preset pressure, the cutting assembly 3 extends out of the joint 1 and penetrates the delivery pipe 2. The joint 1 is driven to rotate by the drill rod, so that the joint 1 drives the cutting assembly 3 to rotate, and then the cutting assembly 3 can annularly cut the delivery pipe 2, and the cut delivery pipe 2 remains in the wellbore.

[0038] In this design, the ball 4 is used to build pressure, the cutting assembly 3 is driven by the way of pressurizing the inside of the joint 1, the operation is convenient, and no additional equipment cost is increased.

[0039] In some embodiments, continuing to refer to Figure 1 and Figure 2 The inner wall of the joint 1 is provided with an annular protrusion 12, the side of the annular protrusion 12 facing the drill rod is provided with a first tapered surface 121 to form the ball seat hole 11.

[0040] In this design, the first tapered surface 121 is arranged on the annular protrusion 12 to guide the positioning of the ball 4, so as to ensure that the ball 4 is coaxial with the ball seat hole 11, the outer periphery of the ball 4 is attached to the inner wall of the ball seat hole 11, and the plugging effect is ensured.

[0041] In some embodiments, the side of the cutting assembly 3 away from the ball seat hole 11 is provided with a second inclined surface 13. In this design, the second inclined surface 13 can preliminarily guide the positioning of the ball 4, so as to ensure that the ball 4 moves towards the direction of the ball seat hole 11.

[0042] In some embodiments, in combination with the illustrations of Figure 1 、 Figure 2 and Figure 3 , the side wall of the joint 1 is provided with a through hole 14, and the cutting assembly 3 includes a piston cutter 31 arranged in the through hole 14. In a normal state, the piston cutter 31 does not protrude out of the through hole 14.

[0043] In this design, the cutting assembly 3 is located in the through hole 14, which can guide the movement of the cutting assembly 3 through the through hole 14, so as to ensure that the cutting assembly 3 can protrude out of the joint 1 and pierce the conveying pipe 2 under high pressure. The through hole 14 can accommodate the non-protruding piston cutter 31, so as to avoid the piston cutter 31 from extending into the interior of the joint 1 in a non-working state, thereby avoiding affecting the delivery of the plugging slurry and the use of the piston cutter 31.

[0044] In some embodiments, the piston cutter 31 includes a piston seat 311 and a cutter head 312 arranged on the piston seat 311, and the cutting edge of the cutter head 312 is arranged along the circumferential direction of the conveying pipe 2.

[0045] Specifically, the axis direction of the piston seat 311 is consistent with the axis direction of the through hole 14, so that the piston seat 311 can move along the axis direction of the through hole 14, thereby enabling the piston seat 311 to drive the cutter head 312 to protrude out of the joint 1 and pierce the conveying pipe 2. In addition, the cutting edge of the cutter head 312 is arranged along the circumferential direction of the conveying pipe 2, so that the cutter head 312 can rotate and cut the conveying pipe 2 during the rotation of the joint 1, thereby ensuring the cutting effect of the conveying pipe 2.

[0046] In some embodiments, the through hole 14 is a stepped hole including a first hole 141 arranged on the inner side of the joint 1 and a second hole 142 arranged on the outer side of the joint 1, the diameter of the first hole 141 is greater than the diameter of the second hole 142, and the piston seat 311 is slidingly arranged in the first hole 141.

[0047] In this design, the stepped hole design can limit the movement range of the piston seat 311, that is, in the high-pressure state, the piston seat 311 moves towards the outside of the joint 1, and during the movement, the movement distance of the joint 1 can be limited by the stepped surface of the first hole 141 and the second hole 142, avoiding the piston seat 311 from being separated from the joint 1, and further avoiding the piston seat 311 from falling into the wellbore, and avoiding affecting the subsequent drilling operation. In addition, when the piston seat 311 contacts the stepped surface, the cutter head 312 can extend out of the joint 1 and pierce the delivery pipe 2.

[0048] In some embodiments, as shown in Figure 3 The inner side of the piston cutter 31 is provided with a retaining ring 313, the outer periphery of the retaining ring 313 extends beyond the outer periphery of the piston cutter 31, specifically, the diameter of the retaining ring 313 is greater than the diameter of the piston seat 311 of the piston cutter 31, so that the outer periphery of the retaining ring 313 can extend beyond the outer periphery of the piston cutter 31. The inner side of the through hole 14 is provided with a third hole 143 for accommodating the retaining ring 313, that is, the third hole 143 matches the retaining ring 313 to accommodate the retaining ring 313. The third hole 143 is provided with an annular cutter 1431, and the part of the retaining ring 313 extending beyond the piston cutter 31 can be cut off by the annular cutter 1431 when the internal pressure of the joint 1 reaches a preset pressure. That is, the cutting edge of the annular cutter 1431 and the position of the retaining ring 313 connected to the piston cutter 31 are opposite, so that when the internal pressure of the joint 1 reaches the preset pressure, the high pressure exerts a force on the retaining ring 313 and the piston cutter 31 towards the outside of the joint 1, at this time, the pressure at the position of the retaining ring 313 connected to the piston cutter 31 and the cutting edge of the annular cutter 1431 increases, so that the annular cutter 1431 can cut off the retaining ring 313, at this time, since the piston cutter 31 loses the restriction of the retaining ring 313 and the third hole 143, the piston cutter 31 can extend out of the joint 1 under the action of high pressure.

[0049] In this design, by setting the retaining ring 313 and the third hole 143, the piston cutter 31 can be protected, avoiding that the lost circulation slurry accidentally cuts off the piston cutter 31 and pierces the delivery pipe 2 during the delivery process of the lost circulation slurry, and avoiding affecting the delivery effect of the lost circulation slurry.

[0050] In some embodiments, the pressure at which the annular cutter 1431 can cut off the retaining ring 313 is greater than the pressure at which the piston cutter 31 can extend out of the joint 1, and the pressure at which the annular cutter 1431 can cut off the retaining ring 313 should be greater than the pressure exerted by the lost circulation slurry on the retaining ring 313 during the delivery process of the lost circulation slurry.

[0051] In this design, the pressure of the plugging slurry applied on the retaining ring 313 can cut off the retaining ring 313 by the annular cutter 1431, and the plugging slurry can push the piston cutter 31 to extend out of the joint 1. In addition, the pressure applied on the retaining ring 313 can cut off the retaining ring 313 by the annular cutter 1431, and the pressure applied on the piston cutter 31 can also push the piston cutter 31 to extend out of the joint 1.

[0052] In some embodiments, a sealing member 5 is arranged between the piston seat 311 and the inner wall of the through hole 14. The sealing member 5 can be an O-shaped sealing ring or the like, which can be selected according to actual needs.

[0053] In this design, the sealing connection between the piston seat 311 and the through hole 14 can be ensured, and the phenomenon of fluid leakage can be avoided, and the conveying effect can be ensured.

[0054] In some embodiments, the joint 1 comprises a first body 15 for connecting with a drill rod and a second body 16 connected with the first body 15, the diameter of the second body 16 is smaller than that of the first body 15, the conveying pipe 2 is sleeved on the outer periphery of the second body 16, and the cutting assembly 3 is arranged on the second body 16.

[0055] Specifically, the inner side of the first body 15 is provided with an internal thread, and the internal thread is used for thread connection with an external thread on the outer periphery of the end of the drill rod, thereby increasing the convenience of connecting the first body 15 with the drill rod. The conveying pipe 2 is sleeved on the outer periphery of the second body 16, so that the end of the conveying pipe 2 can abut against the end face of the first body 15, thereby ensuring the positioning effect when the conveying pipe 2 is connected, and through the limitation of the end face of the first body 15 and the clamping ring 17 described below, the conveying pipe 2 can be prevented from moving along the axial direction thereof, thereby ensuring the conveying effect of the plugging slurry.

[0056] In some embodiments, the outer periphery of the joint 1 is provided with a clamping ring 17, and the conveying pipe 2 is provided with an annular clamping groove matched with the clamping ring 17. The through hole 14 is arranged on the side of the clamping ring 17 away from the drill rod.

[0057] In this design, the conveying pipe 2 is connected with the joint 1 through the clamping and matching of the annular clamping groove and the clamping ring 17, and the connection effect of the conveying pipe 2 and the joint 1 can be ensured, and in addition, the conveying pipe 2 and the joint 1 can relatively rotate, thereby ensuring that the cutting assembly 3 can rotate and cut the conveying pipe 2.

[0058] In some embodiments, the side of the clamping ring 17 away from the drill rod is provided with a third inclined surface, and the side of the clamping ring 17 facing the drill rod is a flat surface, so that the clamping ring 17 has a one-way clamping ring structure.

[0059] The snap ring 17 in this design can facilitate the fitting of the delivery pipe 2 into the outer periphery of the joint 1, increasing the convenience of operation. At the same time, it avoids the disconnection of the delivery pipe 2 from the joint 1, ensuring the firmness of the connection between the delivery pipe 2 and the joint 1.

[0060] In some embodiments, the number of the through holes 14 and the piston cutters 31 is two. The use of two piston cutters 31 avoids the situation that one of the piston cutters 31 is pushed out while the other piston cutter 31 remains in the joint 1, causing the failure of the release, and the use of two piston cutters 31 can better ensure the effective cutting of the high-pressure hose 21.

[0061] In some embodiments, the delivery pipe 2 is a high-pressure hose 21. The high-pressure hose 21 can be bent according to the shape of the wellbore, so as to be applicable to horizontal wells and the like, increasing the range of application.

[0062] In some embodiments, as shown in Figure 4 the high-pressure hose 21 comprises, from the inside to the outside, an inner tube 211, a sealing layer 212, a skeleton layer 213, and an outer tube 214. The material of the sealing layer 212 can be chloro ether rubber, etc.

[0063] In this design, by setting the sealing layer 212, the air tightness of the high-pressure hose 21 can be increased, so that the high-pressure hose 21 can effectively isolate the inner and outer spaces of the high-pressure hose 21, greatly reduce the leakage of the plugging slurry in the inner tube 211 under the condition of pressure maintenance, and thus improve the overall strength of the inner tube 211, prevent the inner tube 211 from being blown by high pressure, and prolong the service life of the high-pressure hose 21. By setting the skeleton layer 213, the structural strength of the high-pressure hose 21 can be effectively increased, so as to ensure that the high-pressure hose 21 has a certain rigidity, making the high-pressure hose 21 easy to place in different working environments, and at the same time, avoiding the bending and knotting of the high-pressure hose 21 during the lowering process, affecting the pumping of the plugging slurry, and ensuring the good use effect in the inclined well or horizontal well section.

[0064] In some embodiments, the inner tube 211 comprises, from the inside to the outside, a smooth coating layer and a silicone rubber layer, i.e. the inner surface of the silicone rubber layer is coated with a smooth coating layer. The silicone rubber layer can ensure the softness of the inner tube 211, so that the high-pressure hose 21 can be inserted into the horizontal well, etc. The smooth coating layer can increase the smoothness of the inner surface of the high-pressure hose 21, ensuring the smoothness of the fluid flow. The smooth coating layer is a polyurethane coating layer, etc. In addition, the silicone rubber layer makes the inner tube 211 itself have excellent high-temperature resistance, and the smooth coating layer makes the inner surface of the inner tube 211 smooth, which is easy to slide off under gravity after the piston cutter 31 cuts the high-pressure hose 21, realizing the release.

[0065] In some embodiments, the skeleton layer 213 is made of metal fiber yarns. The skeleton layer 213 in this design can ensure the flexibility of the inner tube 211, so that the inner tube 211 can easily adjust its shape to different working environments. The metal fiber yarns can form a counterforce with the pressure in the inner tube 211 by using the toughness of the fiber yarns, further protecting the inner tube 211 from cracking due to excessive internal pressure, and ensuring the use effect of the high-pressure hose 21. In addition, the skeleton layer 213 in this design can be easily cut by the cutting assembly 3.

[0066] In some embodiments, the outer tube 214 includes an ethylene-propylene-diene rubber layer, a composite layer and a wear-resistant coating layer arranged from inside to outside, that is, the composite layer is arranged on the outer surface of the ethylene-propylene-diene rubber layer, and the wear-resistant coating layer is coated on the outer surface of the composite layer. The ethylene-propylene-diene rubber layer makes the outer tube 214 itself have excellent wear resistance, and the composite layer can further enhance the wear resistance of the outer tube 214, and the wear-resistant coating layer makes the surface of the outer tube 214 smooth, reduces the friction when the high-pressure hose 21 contacts with external objects, ensures the wear resistance of the high-pressure hose 21, and at the same time ensures that the high-pressure hose 21 and the joint 1 can rotate relative to each other, facilitating the rotary cutting of the high-pressure hose 21.

[0067] The composite layer is made of nylon fiber and polyester resin material, and the outer surface of the composite layer is roughened for the coating of the wear-resistant coating layer. In addition, the wear-resistant coating layer can be a Teflon coating.

[0068] The release-type leak stoppage auxiliary device provided by the present application provides effective safety protection for the risks of residual drilling tools, formation return, or flash condensation of leak stoppage slurry, that is, when a risk occurs, the ball 4 is used to pressurize and eject the piston cutter 31, and the high-pressure hose 21 is cut under the action of torque. After cutting, the release-type joint 1 and the upper drilling tools can be normally tripped in and out, the high-pressure hose 21 remaining in the well is broken under the cutting action of the subsequent drill bit, and is circulated to the ground with the drilling fluid, without affecting the subsequent safe drilling. The structure is simple, the operation is convenient, and the use effect is good.

[0069] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve the purpose of distinguishing between two entities or operations, without necessarily requiring or implying any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "containing" or any other transitional term, do not exclude other elements or steps, but merely specify the presence of the stated elements or steps. The term "consisting of" is intended to mean an exclusive listing, such that the process, method, article, or apparatus includes only the listed elements, and no other elements. The term "including" or "comprising" an element is intended to mean that there is no exclusion of further unspecified elements which can be additional to or alternatively to the listed elements.

[0070] The foregoing is considered as illustrative only of the principles of the application. Numerous modifications and changes will readily occur to those skilled in the art, and the generic principles defined herein can be applied to other implementations without departing from the spirit or scope of the application. Accordingly, the scope of the application is intended to be defined only by the scope of the claims appended hereto.

Claims

1. A lost circulation mitigation auxiliary device, characterized in that, The application relates to a joint (1) connected with a drill rod and a conveying pipe (2) rotationally connected with the joint (1), at least one cutting assembly (3) is arranged on the joint (1), the cutting assembly (3) can extend out of the side wall of the joint (1) and penetrate the conveying pipe (2) when the internal pressure of the joint (1) reaches a preset pressure, the joint (1) can rotate relative to the conveying pipe (2) under the driving of the drill rod to annularly cut the conveying pipe (2), and the cut conveying pipe (2) is separated from the joint (1).

2. The drift-off backup device of claim 1, wherein, An internal part of the joint (1) is provided with a ball seat hole (11) for receiving a ball (4), the ball (4) falling into the ball seat hole (11) can separate the internal cavity of the joint (1), and the cutting assembly (3) is located on the side of the ball seat hole (11) facing the drill rod.

3. The drift-off backup device of claim 2, wherein, An inner wall of the joint (1) is provided with an annular protrusion (12), a first tapered surface (121) is arranged on the side of the annular protrusion (12) facing the drill rod to form the ball seat hole (11).

4. The drift-off backup device of claim 2, wherein, A side of the cutting assembly (3) away from the ball seat hole (11) is provided with a second inclined surface (13).

5. The autorelease backup device of claim 1, wherein, A side wall of the joint (1) is provided with a through hole (14), the cutting assembly (3) comprises a piston cutter (31) arranged in the through hole (14), and the piston cutter (31) does not extend out of the through hole (14) in a normal state.

6. The drift-off backup device of claim 5, wherein, The piston cutter (31) comprises a piston seat (311) and a cutter head (312) arranged on the piston seat (311), and the cutting edge of the cutter head (312) is arranged along the circumferential direction of the conveying pipe (2).

7. The drift-off backup device of claim 6, wherein, The through hole (14) is a stepped hole, the stepped hole comprises a first hole (141) arranged on the inner side of the joint (1) and a second hole (142) arranged on the outer side of the joint (1), the diameter of the first hole (141) is larger than that of the second hole (142), and the piston seat (311) is slidingly arranged in the first hole (141).

8. The autorelease backup device of claim 5, wherein, The inner side of the piston cutter (31) is provided with a retaining ring (313), the outer periphery of the retaining ring (313) extends out of the outer periphery of the piston cutter (31), the inner side of the through hole (14) is provided with a third hole (143) for accommodating the retaining ring (313), the third hole (143) is provided with an annular cutter (1431), and the part of the retaining ring (313) extending out of the piston cutter (31) can be cut off by the annular cutter (1431) when the internal pressure of the joint (1) reaches the preset pressure.

9. The autoremoving backup device according to claim 6, characterized in that, A sealing element (5) is arranged between the piston seat (311) and the inner wall of the through hole (14).

10. The autorelease backup device of claim 1, wherein, The joint (1) comprises a first body (15) for being connected with a drill rod and a second body (16) connected with the first body (15), the diameter of the second body (16) is smaller than that of the first body (15), the conveying pipe (2) is sleeved on the outer periphery of the second body (16), and the cutting assembly (3) is arranged on the second body (16).

11. The autorelease backup device of claim 1, wherein, The outer periphery of the joint (1) is provided with a snap ring (17), and the conveying pipe (2) is provided with an annular snap groove matched with the snap ring (17).

12. The drift-off backup device of claim 1, wherein, The conveying pipe (2) is a high-pressure hose (21).

13. The drift-off back-up device of claim 12, wherein, The high-pressure hose (21) comprises an inner pipe (211), a sealing layer (212), a skeleton layer (213) and an outer pipe (214) arranged in sequence from inside to outside.

14. The drift-off back-up device of claim 13, wherein, The inner pipe (211) comprises a smooth coating layer and a silicone rubber layer arranged in sequence from inside to outside. And / or, the skeleton layer (213) is made of metal fiber wire knitting; And / or, the outer pipe (214) comprises a ternary ethylene-propylene rubber layer, a composite layer and a wear-resistant coating layer arranged in sequence from inside to outside.

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