Threading drill rod for communication

Abstract

The invention relates to a threading drill rod for communication. The threading drill rod comprises a drill rod pipe body, a male connector, a female connector, a first induction coil, a second induction coil, a protective guide pipe, a communication cable and a protective liner. Wherein the first end of the drill rod pipe body is connected with the male connector, and the second end of the drill rod pipe body is connected with the female connector; the male joint is provided with the first induction coil, and the female joint is provided with the second induction coil; the communication cable is laid in the protective conduit, a first end of the communication cable is connected with the first induction coil, and a second end of the communication cable is connected with the second induction coil; the protective guide pipe is tightly attached to the inner wall of the drill rod pipe body, and the protective liner wraps the outer portion of the protective guide pipe. Compared with the prior art, the technical scheme of the invention improves the flexible compensation capability and the protection reliability of the communication cable through the simultaneous arrangement of the protection conduit and the protection liner.

Description

Technical Field

[0001] This application relates to the technical field of oil drilling engineering, and particularly relates to a wire threading drill pipe for communication. Background Art

[0002] In oil drilling engineering, drill pipes, as the core components of drill strings, undertake the key functions of transmitting torque, weight on bit, and conveying drilling fluid. With the wide application of measurement-while-drilling technology, the types and accuracy of downhole measurement parameters have increased significantly, posing higher requirements for data transmission rate, real-time performance, and two-way communication capabilities.

[0003] Currently, although wired communication drill pipes can achieve high-speed and two-way real-time communication through wired transmission technology, their internal cables are vulnerable to harsh environments such as internal pipe pressure, mud scouring, drill pipe bending and torsion deformation, drill string vibration, and local wear and cutting. Currently, the protection method for cables is to make wire grooves on the inner wall of the drill pipe, fix the wires with expansion tubes after threading, or fix them with non-metallic sheaths on the inner circumference of the drill pipe wall.

[0004] However, the existing protection schemes have significant defects. For example, the method of fixing the cable with an expansion tube after opening wire grooves on the inner wall of the drill pipe will weaken the structural strength of the drill pipe and it is difficult to achieve full sealing and dynamic compensation. None of the existing schemes can meet the requirements of cable protection reliability and flexible compensation ability. Summary of the Invention

[0005] This application provides a wire threading drill pipe for communication, which improves the flexible compensation ability and the protection reliability of the communication cable by simultaneously setting a protection conduit and a protection gasket.

[0006] In a first aspect, this application provides a wire threading drill pipe for communication, including: a drill pipe body, a male connector, a female connector, a first induction coil, a second induction coil, a protection conduit, a communication cable, and a protection gasket; wherein, the first end of the drill pipe body is connected to the male connector, and the second end of the drill pipe body is connected to the female connector; the first induction coil is arranged at the male connector, and the second induction coil is arranged at the female connector; the communication cable is laid inside the protection conduit, and the first end of the communication cable is connected to the first induction coil, and the second end of the communication cable is connected to the second induction coil; the protection conduit is arranged closely against the inner wall of the drill pipe body, and the protection gasket is coated on the outside of the protection conduit.

[0007] In a possible implementation manner, the cross-sectional shape of the protection gasket is crescent or leaf-shaped.

[0008] In a possible implementation, the first induction coil is provided at the male connector, and the second induction coil is provided at the female connector. Specifically, it includes: the male connector is provided with a first shoulder and a second shoulder. Among them, a first coil ring groove is provided at the cross-section of the second shoulder, and the first induction coil is placed in the first coil ring groove; the female connector is provided with a third shoulder and a fourth shoulder. Among them, a second coil ring groove is provided at the cross-section of the fourth shoulder, and the second induction coil is placed in the second coil ring groove.

[0009] In a possible implementation, the second end of the communication cable is connected to the second induction coil. Specifically, it includes: the first induction coil is provided with a first coil pin, and a first jack is provided in the first coil pin; the second induction coil is provided with a second coil pin, and a second jack is provided in the second coil pin; the first end of the communication cable is provided with a first plug, the second end of the communication cable is provided with a second plug, the first plug is inserted into the first jack, and the second plug is inserted into the second jack.

[0010] In a possible implementation, a first current passage hole is provided inside the male connector. The first end of the male connector is a first threaded end, and the second end of the male connector is a first friction welding end. The first current passage hole is composed of a first sub-current passage hole corresponding to the first threaded end and a second sub-current passage hole corresponding to the first friction welding end; the through-hole diameter of the first sub-current passage hole is smaller than the through-hole diameter of the second sub-current passage hole, and the first sub-current passage hole and the second sub-current passage hole are connected by a chamfered smooth transition; a second current passage hole is provided inside the female connector. The first end of the female connector is a second threaded end, and the second end of the female connector is a second friction welding end. The second current passage hole is composed of a third sub-current passage hole corresponding to the second threaded end and a fourth sub-current passage hole corresponding to the second friction welding end; the through-hole diameter of the third sub-current passage hole is smaller than the through-hole diameter of the fourth sub-current passage hole, and the third sub-current passage hole and the fourth sub-current passage hole are connected by a chamfered smooth transition; among them, the through-hole diameters of the second sub-current passage hole and the fourth sub-current passage hole are the same as the inner diameter of the drill pipe body.

[0011] In a possible implementation, the communication threading drill pipe provided by the present application further includes: an expansion tube; wherein, the expansion tube is disposed inside the drill pipe body, a part of the expansion tube is connected to the inner wall of the drill pipe body, and another part of the expansion tube is connected to the protective gasket; wherein, the expansion mode of the expansion tube is related to the diameter difference between the first flow hole and the inner diameter of the drill pipe body, or, the expansion mode of the expansion tube is related to the diameter difference between the second flow hole and the inner diameter of the drill pipe body, and the expansion mode includes hydraulic expansion or tension tooling expansion.

[0012] In a possible implementation, the protective conduit at least includes one first protective conduit, wherein both ends of the protective conduit are flattened and filled with a sealant.

[0013] In a possible implementation, the protective gasket is obtained by removing the coating in a preset area inside the drill pipe body to form an exposed metal surface, applying an adhesive to the exposed metal surface, and using a forming extrusion and bonding vulcanization process or a tool-assisted injection molding and vulcanization process.

[0014] In a possible implementation, the forming extrusion and bonding vulcanization process includes: prefabricating an extrusion die tooling, wherein the extrusion die tooling is a crescent-shaped extrusion die tooling or a leaf-shaped extrusion die tooling; extruding rubber based on the extrusion die tooling to obtain a formed gasket, placing the formed gasket inside the drill pipe body, and performing vulcanization treatment on the placed formed gasket to form a protective gasket; the tool-assisted injection molding and vulcanization process includes: building a rubber forming tooling and a tension holding tooling inside the drill pipe body, the tension holding tooling is placed above the rubber forming tooling, wherein the rubber forming tooling is a crescent-shaped gasket forming tooling or a leaf-shaped gasket forming tooling; setting injection holes at both ends of the drill pipe body, injecting rubber into the rubber forming tooling through the injection holes, and performing vulcanization treatment to form a protective gasket.

[0015] In a possible implementation, the protective gasket is obtained by removing the coating from a preset internal area of the drill pipe body to form an exposed metal surface, applying an adhesive to the exposed metal surface, and using a post-molding bonding process of glass fiber reinforced plastic; wherein, the post-molding bonding process of glass fiber reinforced plastic includes: impregnating a glass fiber reinforced material in a resin, cutting and laminating the impregnated glass fiber reinforced material to obtain a composite material layer; thermally pressing and demolding the composite material layer to obtain a fiber reinforced plastic profile, and performing surface treatment on the fiber reinforced plastic profile to remove the release agent and apply a coupling agent; applying pressure to the fiber reinforced plastic profile and the drill pipe body using a lead screw tooling and performing a thermal curing treatment to bond and form the fiber reinforced plastic profile and the drill pipe body into a protective gasket.

[0016] The embodiments of the present application provide a wire threading drill pipe for communication, which has the following advantages compared with the prior art: The wire threading drill pipe for communication includes a drill pipe body, a male connector, a female connector, a first induction coil, a second induction coil, a protective conduit, a communication cable, and a protective gasket; wherein, the first end of the drill pipe body is connected to the male connector, and the second end of the drill pipe body is connected to the female connector; the first induction coil is arranged at the male connector, and the second induction coil is arranged at the female connector; the communication cable is laid inside the protective conduit, and the first end of the communication cable is connected to the first induction coil, and the second end of the communication cable is connected to the second induction coil; the protective conduit is arranged closely against the inner wall of the drill pipe body, and the outside of the protective conduit is coated with the protective gasket; compared with the prior art, the technical solution of the present application places the communication cable inside the protective conduit closely against the inner wall of the drill pipe, and the flexible protective gasket buffers external pressure, mud scouring, and dynamic deformation impact, which not only avoids the weakening of the structural strength caused by grooving, improves the flexible compensation ability, and significantly enhances the protection reliability of the communication cable, but also maintains the flow area of the drilling fluid through-hole by the compact layout of the conduit, reducing the pressure loss. Description of the Drawings

[0017] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments that conform to the present invention, and are used together with the specification to explain the principles of the present invention.

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] One or more embodiments are illustrated by way of example in the accompanying drawings, which do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the drawings in the figures do not constitute a scale limitation.

[0020] Figure 1 is a schematic structural diagram of an embodiment of a threading drill pipe for communication provided by the present application; Figure 2 is a schematic structural diagram of a shoulder of an embodiment provided by the present application; Figure 3 is a schematic connection diagram of male and female joints of an embodiment provided by the present application; Figure 4 is a schematic diagram of the setting of a protective conduit of an embodiment provided by the present application; Figure 5 is a schematic diagram of the setting of a crescent-shaped protective gasket under a single protective conduit of an embodiment provided by the present application; Figure 6 is a schematic diagram of the setting of a leaf-shaped protective gasket under a single protective conduit of an embodiment provided by the present application; Figure 7 is a schematic diagram of the setting of a crescent-shaped protective gasket under a double protective conduit of an embodiment provided by the present application; Figure 8 is a schematic diagram of the setting of a leaf-shaped protective gasket under a double protective conduit of an embodiment provided by the present application; Figure 9 is a schematic diagram of the setting of an expansion tube under a crescent-shaped protective gasket of an embodiment provided by the present application; Figure 10 is a schematic diagram of the setting of an expansion tube under a leaf-shaped protective gasket of an embodiment provided by the present application; Figure 11 is a schematic structural diagram of a mold assembly of an embodiment provided by the present application; Figure 12 is a schematic structural diagram before the expansion of a rectangular gap of an embodiment provided by the present application; Figure 13 is a schematic structural diagram after the expansion of a rectangular gap of an embodiment provided by the present application; Figure 14 is a schematic structural diagram of a tube barrel of an embodiment provided by the present application. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without making creative efforts shall fall within the scope of protection of the present application.

[0022] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0023] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0024] It should also be understood that the terms used in this specification of the present application are merely for the purpose of describing specific embodiments and are not intended to limit the present application. As used in this specification of the present application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0025] It should be further understood that the term "and / or" used in this specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0026] As used in this specification and the appended claims, the term "if" can be interpreted as "when...", "once", "in response to determining" or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if detecting [the described condition or event]" can be interpreted as meaning "once determined", "in response to determining", "once detecting [the described condition or event]" or "in response to detecting [the described condition or event]" according to the context. Embodiment 1, see Figure 1 , Figure 1 is a schematic structural diagram of an embodiment of a threading drill pipe for communication provided by the present application, as Figure 1As shown in the figure, the communication threading drill pipe includes a male joint 11, a drill pipe body 12, a female joint 13, a first induction coil 14, a second induction coil 15, a communication cable 16, a protective conduit 17 and a protective gasket 18, which are specifically as follows: In one embodiment, the first end of the drill pipe body 12 is connected to the male joint 11, and the second end of the drill pipe body 12 is connected to the female joint 13.

[0027] Specifically, the drill pipe body 12 is welded to the male joint 11 and the female joint 13 together by friction welding to form a drill pipe; among them, friction welding is an efficient welding technology that makes the surface of the material reach the plastic state through the heat generated by friction, and then realizes the connection under the action of pressure, with the advantages of fast welding speed, high quality and small deformation.

[0028] Specifically, the first end of the male joint 11 is a first threaded end, the second end of the male joint 11 is a first friction welding end, the first end of the female joint 13 is a second threaded end, and the second end of the female joint 13 is a second friction welding end; among them, the first end of the drill pipe body 12 is welded to the first friction welding end of the male joint 11 by friction welding, and the second end of the drill pipe body 12 is welded to the second friction welding end of the female joint 13 by friction welding.

[0029] Specifically, a first current-carrying hole is arranged inside the male joint, and the first current-carrying hole is composed of a first sub-current-carrying hole corresponding to the first threaded end and a second sub-current-carrying hole corresponding to the first friction welding end; a second current-carrying hole is arranged inside the female joint, and the second current-carrying hole is composed of a third sub-current-carrying hole corresponding to the second threaded end and a fourth sub-current-carrying hole corresponding to the second friction welding end.

[0030] In the existing drill pipe body 12, it is usually a straight pipe with equal wall thickness; when the two pipe ends of the pipe body are respectively connected to the male joint or the female joint by friction welding, the inner diameter of the pipe body at the pipe end is usually larger than the through-hole diameter of the second sub-current-carrying hole corresponding to the first friction welding end in the male joint 11 and larger than the through-hole diameter of the fourth sub-current-carrying hole corresponding to the second friction welding end in the female joint 13. This is because the joint itself requires a thicker wall thickness to bear the threaded connection and torque; however, this structure will cause the communication cable to encounter uneven channels during the laying process, increasing the difficulty of cable installation, and in subsequent use, it may increase wear due to friction and shorten the service life of the cable.

[0031] Based on this, in the embodiments of the present application, in order to meet the requirement of protecting communication cables in a smooth and continuous inner channel, the tube end of the drill pipe body 12 is thickened by an external thickening method to increase the outer diameter of the tube end, so as to increase the wall thickness, and make the inner diameters of the two ends of the drill pipe body 12 equal to the through-hole diameters of the corresponding sub-through-holes of the friction welding ends of the male and female joints respectively, so that the inner wall of the tube end of the drill pipe body 12 and the inner wall of the corresponding friction welding end of the male and female joints achieve smooth and continuous butt joint; this provides an ideal channel with a constant inner diameter and no steps for subsequent installation of the protective gasket and communication cables.

[0032] Specifically, in order to simplify the manufacturing difficulty, when thickening the tube end of the drill pipe body 12 by an external thickening method, the inner diameter of the tube end of the drill pipe body 12 is processed to the same size as the through-hole diameters of the second sub-through-hole corresponding to the male joint 11 and the fourth sub-through-hole corresponding to the female joint 13, that is, the inner diameter of the drill pipe body 12 is the same as the through-hole diameters of the second sub-through-hole in the male joint 11 and the fourth sub-through-hole in the female joint 13.

[0033] Preferably, after the drill pipe body 12 is externally thickened, the inner diameter of the middle part of the drill pipe body 12 is the same as the inner diameter of the thickened part of the two tube ends of the drill pipe body, and the through-hole diameters of the second sub-through-hole in the male joint 11, the through-hole diameters of the fourth sub-through-hole in the female joint 13 and the inner diameter of the tube end of the drill pipe body 12 are consistent; and when the strength is insufficient, the external thickening parameters can be appropriately increased to ensure the strength of the drill pipe.

[0034] Specifically, the male joint 11 is a convex joint, the female joint 13 is a concave joint, and the convex joint and the concave joint cooperate with each other.

[0035] Specifically, when the male joint 11 is connected to the female joint 13, the first threaded end of the male joint 11 is threadedly connected to the second threaded end of the female joint 13.

[0036] Specifically, a first through-hole is provided inside the male joint 11, and the first through-hole is composed of a first sub-through-hole and a second sub-through-hole; when the first sub-through-hole is the sub-through-hole close to the first threaded end and the second sub-through-hole is the sub-through-hole close to the first friction welding end, the through-hole diameter of the first sub-through-hole is smaller than the through-hole diameter of the second sub-through-hole, and the first sub-through-hole and the second sub-through-hole are connected by a chamfered smooth transition method.

[0037] Specifically, a second current-carrying hole is provided inside the female joint 13, and the second current-carrying hole is composed of a third sub-current-carrying hole and a fourth sub-current-carrying hole; when the third sub-current-carrying hole is the sub-current-carrying hole close to the second threaded end, and the fourth sub-current-carrying hole is the sub-current-carrying hole close to the second friction welding end, the aperture of the third sub-current-carrying hole is smaller than that of the fourth sub-current-carrying hole, and the third sub-current-carrying hole and the fourth sub-current-carrying hole are connected by means of a chamfered smooth transition.

[0038] Specifically, the transition angles of the apertures between the sub-current-carrying holes of the male and female joints at both ends of the drill pipe body 12 are also kept consistent; this design not only helps to simplify the cable laying, but also can reduce the mechanical stress concentration and improve the overall strength and reliability of the drill pipe.

[0039] In one embodiment, the first induction coil 14 is provided at the male joint 11, and the second induction coil 15 is provided at the female joint 13.

[0040] Specifically, the male joint 11 is provided with a first shoulder 111 and a second shoulder 112. Among them, a first coil ring groove is provided at the cross-section of the second shoulder 112, and the first induction coil 14 is placed in the first coil ring groove; the female joint 13 is provided with a third shoulder 131 and a fourth shoulder 132. Among them, a second coil ring groove is provided at the cross-section of the fourth shoulder 132, and the second induction coil 15 is placed in the second coil ring groove; as Figure 2 shown, Figure 2 is a schematic structural diagram of the shoulder of an embodiment provided by the present application.

[0041] Specifically, the first shoulder 111 is provided on the side of the male joint 11 close to the drill pipe body 12, the second shoulder 112 is provided on the side of the male joint 11 away from the drill pipe body 12, the third shoulder 131 is provided on the side of the female joint 13 away from the drill pipe body 12, and the fourth shoulder 132 is provided on the side of the female joint 13 close to the drill pipe body 12.

[0042] Specifically, the cross-sections of the first shoulder 111 and the third shoulder 131 cooperate with each other after the male and female joints are connected, and the cross-sections of the second shoulder 112 and the fourth shoulder 132 cooperate with each other after the male and female joints are connected.

[0043] In one embodiment, the communication cable 16 is laid inside the protection conduit 17, and the first end of the communication cable 16 is connected to the first induction coil 14, and the second end of the communication cable 16 is connected to the second induction coil 15.

[0044] In one embodiment, after the first end of the male connector 11 is connected to the drill pipe body 12, the second end of the male connector 11 is used to connect to the female connector 13 on the previous drill pipe of the current drill pipe; after the first end of the female connector 13 is connected to the drill pipe body 12, the second end of the female connector 13 is used to connect to the male connector 11 on the next drill pipe of the current drill pipe, so as to realize the connection between multiple drill pipes.

[0045] Specifically, the secondary circuit is generated by electromagnetic induction between the first induction coil 14 and the second induction coil 15 among the communication drill pipes and is sequentially transmitted to each drill pipe downward.

[0046] Specifically, after the male connector 11 and the female connector 13 in different drill pipe bodies 12 are connected, the first induction coil 14 and the second induction coil 15 cooperate with each other at the connection of the male and female connectors, and the induction coils use the principle of electromagnetic induction to transmit current signals. Specifically, the first induction coil 14 is provided with a first coil pin 141, wherein a first jack is provided in the first coil pin 141, the second induction coil 15 is provided with a second coil pin 151, wherein a second jack is provided in the second coil pin 151; as Figure 3 shown, Figure 3 is a connection schematic diagram of the male and female connectors of an embodiment provided by the present application.

[0047] Specifically, the first end of the communication cable 16 is provided with a first plug, the second end of the communication cable 16 is provided with a second plug, the first plug is inserted into the first jack, and the second plug is inserted into the second jack.

[0048] Specifically, the communication cable 16 includes but is not limited to coaxial optical fiber or twisted pair.

[0049] Specifically, after the first induction coil 14, the second induction coil 15, the first coil pin 141, the second coil pin 151 and the communication cable 16 are conducted, they all have insulation protection; preferably, the first induction coil 14 and the second induction coil 15 can adopt ceramic coating insulation.

[0050] In one embodiment, if the communication cable 16 is directly laid inside the drill pipe body 12 without other protection, the drilling mud or cement for well cementing will damage the cable. Based on this, a protection conduit 17 is also provided in the present application, and the communication cable 16 is laid inside the protection conduit 17, so that the protection conduit 17 bears the pressure inside the drill pipe and the erosion of the mud, and avoids damage to the communication cable 16.

[0051] In one embodiment, the protection conduit 17 is disposed close to the inner wall of the drill pipe body 12.

[0052] As Figure 4 shown Figure 4 is a schematic diagram of the setting of a protective catheter according to an embodiment provided by the present application.

[0053] Specifically, the protective catheter 17 includes, but is not limited to, a stainless steel pipe, and the material of the stainless steel pipe includes, but is not limited to, 304 or 316; preferably, the protective catheter 17 can also be made of other composite materials.

[0054] Specifically, during the drilling process, the drill pipe will be subjected to various mechanical forces, including bending, torsion, and tension, etc.; if the stainless steel catheter is not pre-stretched, when the drill pipe is subjected to bending and torsional forces, additional tension may be generated inside the catheter; this tension may damage the communication cable 16 laid in the catheter and affect the reliability of data transmission; therefore, the present application also applies a pre-stretching force to the protective catheter 17 before laying, which can pre-eliminate the internal stress of the protective catheter 17, make it more stable during subsequent use, and reduce the risk of cable damage caused by mechanical deformation; and when the drill pipe undergoes bending and torsional deformation, the protective catheter 17 can also provide compensation protection for the communication cable 16 and reduce the risk of cable damage caused by mechanical deformation.

[0055] Specifically, the protective catheter 17 includes at least one first protective catheter, that is, the number of the protective catheters 17 is at least one; when the number of the protective catheters 17 is two, the protective catheter 17 includes a first protective catheter and a second protective catheter, and the two protective catheters 17 are used to place two communication cables 16, and the two communication cables 16 are both connected to the induction coil. One of the two communication cables 16 is used for normal use, and the other communication cable is used as a backup to prevent communication loss due to the breakage of one communication cable 16.

[0056] Preferably, since the communication threading drill pipe is placed in the drill string, the drill string is composed of several communication threading drill pipes, and at least one communication cable 16 wrapped by the protective catheter 17 is provided in the communication threading drill pipe, which can greatly improve the reliability of drill pipe communication.

[0057] Specifically, both ends of the protective catheter 17 are flared and filled with a sealant; among them, high-temperature flaring is a heat treatment process. By flaring both ends of the catheter at high temperature, the structural strength of the catheter end can be enhanced, so that it can better withstand the action of mechanical forces, especially the impact and vibration that may be encountered during the connection and use of the drill pipe; and the flared catheter end can better combine with the sealant to form a sealed structure to prevent drilling fluid or other harmful substances from entering the catheter interior, thereby protecting the communication cable 16 and the plug of the electromagnetic coil.

[0058] In one embodiment, the outside of the protective conduit 17 is coated with the protective gasket 18.

[0059] Specifically, during the drilling process, the communication cable 16 inside the drill pipe needs to be effectively protected to prevent it from being affected by the scouring of drilling fluid, mechanical vibration, bending and torsion deformation, etc.; although the stainless steel pipe itself already provides good protection, in order to further improve the protection performance, the protective gasket 18 is introduced in the embodiment of the present application.

[0060] Specifically, the protective gasket 18 can further enhance the tightness and insulation of the protective conduit 17, prevent drilling fluid or other harmful substances from entering the protective conduit 17, and protect the communication cable 16 from corrosion and mechanical damage; the protective gasket 18 can also play a buffering role, reducing the influence of the mechanical force received during these drilling processes on the communication cable 16, thereby improving the reliability and service life of the cable.

[0061] Specifically, the cross-sectional shape of the protective gasket 18 is crescent-shaped or leaf-shaped; the crescent-shaped protective gasket or leaf-shaped protective gasket occupies a small space in the drill pipe water eye and will not significantly reduce the fluid passage area inside the drill pipe, thus ensuring the normal flow of drilling fluid; and the gasket of this shape has a large contact length with the inner wall of the drill pipe, can provide better support and protection effects, and at the same time enhance the stability of the gasket; as Figure 5 shown, Figure 5 is a schematic diagram of the setting of the crescent-shaped protective gasket under a single protective conduit provided by the present application; as Figure 6 shown, Figure 6 is a schematic diagram of the setting of the leaf-shaped protective gasket under a single protective conduit provided by the present application; as Figure 7 shown, Figure 7 is a schematic diagram of the setting of the crescent-shaped protective gasket under a double protective conduit provided by the present application; as Figure 8 shown, Figure 8 is a schematic diagram of the setting of the leaf-shaped protective gasket under a double protective conduit provided by the present application.

[0062] Specifically, the protective gasket 18 is made of rubber; the rubber includes but is not limited to fluororubber and nitrile rubber; among them, the nitrile rubber has the advantages of excellent oil resistance, wear resistance, strong adhesion, and low cost, while the fluororubber has the characteristic of high temperature resistance.

[0063] In one embodiment, the protective gasket 18 is obtained by removing the coating in the internal preset area of the drill pipe body 12 to form an exposed metal surface, coating an adhesive on the exposed metal surface, and using the forming extrusion and bonding vulcanization process or using the tooling-assisted injection molding and vulcanization process.

[0064] In one embodiment, the forming extrusion and bonding vulcanization process includes: prefabricating an extrusion die tooling, where the extrusion die tooling is a crescent-shaped extrusion die tooling or a leaf-shaped extrusion die tooling; extruding rubber based on the extrusion die tooling to obtain a formed gasket, placing the formed gasket inside the drill pipe body 12, and performing vulcanization treatment on the placed formed gasket to form a protective gasket 18.

[0065] Specifically, according to the shape of the required protective gasket 18, such as crescent-shaped or leaf-shaped, prefabricate an extrusion die tooling; the shape of this tooling determines the final shape of the protective gasket 18. By removing the coating on the inner wall of the drill pipe body 12 where rubber needs to be bonded, to ensure that the rubber can be firmly bonded to the inner wall of the drill pipe body 12. Apply a rubber adhesive on the exposed metal part to enhance the bonding strength between the rubber and the inner wall of the drill pipe body 12; extrude the rubber through the prefabricated extrusion die tooling to form the required shape of the protective gasket 18, and place the protective gasket 18 at an appropriate position on the inner wall of the drill pipe body 12. When fixing the protective gasket 18 on the inner wall of the drill pipe body 12, perform vulcanization treatment on it to make the protective gasket 18 have better physical properties and chemical stability.

[0066] In one embodiment, the tooling-assisted rubber injection and vulcanization process includes: building a rubber forming tooling and a tension holding tooling inside the drill pipe body 12, with the tension holding tooling placed above the rubber forming tooling, where the rubber forming tooling is a crescent-shaped gasket forming tooling or a leaf-shaped gasket forming tooling; setting injection holes at both ends of the drill pipe body 12, injecting rubber into the rubber forming tooling through the injection holes, and performing vulcanization treatment to form a protective gasket 18.

[0067] Specifically, by removing the coating on the inner wall of the drill pipe body 12 where rubber needs to be bonded, to ensure that the rubber can be firmly bonded to the inner wall of the drill pipe body 12. Apply a rubber adhesive on the exposed metal part to enhance the bonding strength between the rubber and the inner wall of the drill pipe body 12; use the rubber forming tooling to inject rubber into the inner wall of the drill pipe body 12 and perform vulcanization treatment; among them, adopt an injection tooling scheme for injection treatment. The injection tooling scheme includes plugging the two end joints of the drill pipe body 12, and opening injection holes, exhaust holes and a tension holding tooling at both end joints. Place a tension holding tooling above the forming tooling to prevent rubber from overflowing from the connection gap between the forming tooling and the drill pipe wall, and inject rubber into the rubber forming tooling through the injection holes to ensure that the rubber can be evenly filled in the forming tooling.

[0068] Specifically, when building a rubber forming tooling for the inside of the drill pipe body 12, the crescent gasket forming tooling can be made of a cut and flattened metal plate; the leaf-shaped gasket forming tooling can be cut from a metal pipe or made by bending a metal plate.

[0069] In one embodiment, the protective gasket is obtained by removing the coating in a preset area inside the drill pipe body to form an exposed metal surface, applying an adhesive to the exposed metal surface, and using a glass fiber reinforced plastic post-forming bonding process.

[0070] In one embodiment, the glass fiber reinforced plastic post-forming bonding process includes: impregnating a glass fiber reinforced material in a resin, cutting and laminating the impregnated glass fiber reinforced material to obtain a composite material layer; performing hot pressing and demolding on the composite material layer to obtain a fiber reinforced plastic profile, and performing surface treatment on the fiber reinforced plastic profile to remove the mold release agent and apply a coupling agent; applying pressure to the fiber reinforced plastic profile and the drill pipe body using a lead screw tooling and performing a heat curing process to bond and form the fiber reinforced plastic profile and the drill pipe body to form a protective gasket.

[0071] Specifically, an example is given for the process of preparing the protective gasket 18 using a glass fiber reinforced plastic and a post-forming bonding process; wherein, the glass fiber reinforced plastic and the post-forming bonding process include impregnating a glass fiber reinforced material in a resin, cutting the impregnated glass fiber reinforced material into a predetermined shape, and performing a lamination process to form a composite material layer, embedding a wire conduit in the composite material layer, placing the composite material layer in a mold, performing hot pressing, taking out the formed fiber reinforced plastic profile from the mold to complete demolding; removing the coating on the inner wall of the drill pipe body 12 that needs to be bonded; wiping the inside of the drill pipe body with acetone to ensure no residual dust, and applying an adhesive to the exposed metal part; sanding the fiber reinforced plastic profile to remove the mold release agent and applying a coupling agent; applying pressure to the fiber reinforced plastic profile and the drill pipe body using a lead screw tooling and performing a heat curing process to bond and form the fiber reinforced plastic profile and the drill pipe body to form a protective gasket.

[0072] Preferably, the protective conduit 17 is also designed to deflect towards and closely adhere to the hole wall, and a hole for the protective conduit 17 is left in the protective gasket 18; this is because in the design of the drill pipe, the diameter of the flow-through hole usually becomes larger at certain positions to facilitate the installation and laying of the communication cable 16; at the positions where the flow-through hole becomes larger, the protective conduit 17 is designed to deflect towards the hole wall and closely adhere to it; this design can ensure that the conduit can better adapt to the shape of the hole wall during installation and reduce the installation difficulties caused by the change in the hole diameter; at the same time, to facilitate the prefabrication and installation of the protective gasket 18, a hole is left at the position of the protective conduit 17 when setting the protective gasket 18, which can ensure that the protective gasket 18 will not interfere with the protective conduit 17 during installation and can better fit the inner wall of the drill pipe to provide uniform protection.

[0073] In one embodiment, through the combination of the protective conduit 17 and the protective gasket 18, not only can the protection and flexible compensation problems of the communication cable 16 be effectively solved, but also the drilling water eye area can be enlarged through optimized design to reduce the drilling pressure loss; this design improves the overall performance and reliability of the drill pipe system while enhancing the cable protection performance, and is applicable to various complex application scenarios in modern oil drilling engineering.

[0074] In one embodiment, a threading drill pipe for communication provided by the present application further includes an expansion tube 19; wherein, the expansion tube 19 is arranged inside the drill pipe body 12, a part of the expansion tube 19 is connected to the inner wall of the drill pipe body 12, and another part of the expansion tube 19 is connected to the protective gasket 18.

[0075] Specifically, the expansion mode of the expansion tube is related to the diameter difference between the first flow-through hole and the inner diameter of the drill pipe body, or the expansion mode of the expansion tube is related to the diameter difference between the second flow-through hole and the inner diameter of the drill pipe body, and the expansion mode includes hydraulic expansion or tension tooling expansion.

[0076] Specifically, in the drill pipe design, when there is a diameter difference between the inner diameter of the drill pipe body 12 and the first flow-through hole of the male joint 11, or between the inner diameter of the drill pipe body 12 and the second flow-through hole of the female joint 13, the protective gasket 18 may be displaced or damaged due to mechanical force, thereby affecting the protection effect of the communication cable 16 and the reliability of data transmission. Based on this, an expansion tube 19 is introduced in this application. The expansion tube 19 is arranged inside the drill pipe body 12. One part of the expansion tube 19 is connected to the inner wall of the drill pipe body 12, and the other part of the expansion tube 19 is connected to the protective gasket 18. After expansion, the expansion tube 19 fits tightly with the inner wall of the drill pipe body 12 at the place without the protective gasket 18 and fits tightly with the protective gasket 18 at the place of the protective gasket 18, forming a solid support structure, which can effectively prevent the protective gasket 18 from being displaced or damaged under the action of mechanical force. Moreover, the expansion process of the expansion tube 19 can fill the tiny gaps between the protective gasket 18 and the inner wall of the drill pipe, forming a sealing layer to prevent drilling fluid or other harmful substances from entering the inside of the protective gasket 18, further protecting the communication cable 16.

[0077] Specifically, when the diameter difference between the inner diameter of the drill pipe body 12 and the first flow-through hole of the male joint 11, or between the inner diameter of the drill pipe body 12 and the second flow-through hole of the female joint 13 is small, the expansion tube is expanded by means of hydraulic expansion; for example, high-pressure water expansion is used at normal temperature until the sleeve of the expansion tube 19 fits completely with the inner wall of the drill pipe and the protective gasket 18, as Figure 9 shown, Figure 9 is a schematic diagram of the setting of the expansion tube under the crescent-shaped protective gasket in an embodiment provided by this application; as Figure 10 shown, Figure 10 is a schematic diagram of the setting of the expansion tube under the leaf-shaped protective gasket in an embodiment provided by this application.

[0078] Specifically, the expansion tube 19 is designed with a thin-walled tube body, and its diameter is slightly smaller than the minimum inner diameter of the drill pipe; this design enables the expansion tube 19 to smoothly penetrate into the drill pipe and fit evenly with the inner wall of the drill pipe during the expansion process.

[0079] Preferably, the initial diameter of the expansion tube 19 is 80 mm and can be expanded to 110 mm through expansion to adapt to the inner diameter profile of the drill pipe; this design allows the expansion tube 19 to have a large deformation space during the expansion process, enabling the expansion tube 19 to fit tightly with the inner wall of the drill pipe, forming a solid support structure. Once the expansion tube 19 undergoes expansion deformation, the ability of water to overflow into the large-diameter cavity will be greatly reduced, and the sealing performance will be further improved; this design not only improves the fit degree between the expansion tube 19 and the inner wall of the drill pipe but also enhances the sealing performance of the entire structure.

[0080] Preferably, the expansion tube 19 is a seamless stainless steel pipe, and the seamless stainless steel pipe adopts a ductile pipe material, such as annealed 304 / 316 stainless steel pipe; these materials have good toughness and plasticity and can achieve large deformations under high pressure without cracking.

[0081] Specifically, the hydraulic expansion process of the expansion tube 19 includes: the expansion tube 19 is placed in a closed die assembly. The role of the die assembly is to provide a controlled environment to ensure the uniformity and safety of the expansion process. It is blocked at the first end of the die assembly, and pressure regulating devices such as throttle valves and pressure gauges are added. These pressure regulating devices are used to control and monitor the pressure during the expansion process to ensure that the expansion process is carried out within a safe range; it is blocked at the second end of the die assembly, and pressure regulating devices such as throttle valves and pressure gauges are added; these pressure regulating devices are used to control and monitor the pressure during the expansion process to ensure that the expansion process is carried out within a safe range. In order to prevent high-pressure water from overflowing into the large-diameter cavity, sealing elements such as soft copper gaskets 191 and O-rings 192 are added to the die assembly. These sealing elements can effectively prevent the leakage of high-pressure water and ensure the smooth progress of the expansion process; as Figure 11 shown, Figure 11 is a schematic structural diagram of a die assembly according to an embodiment provided by the present application.

[0082] Specifically, in the drill pipe design, when there is a large diameter gap between the inner diameter of the drill pipe body 12 and the first flow hole of the male joint 11, or between the inner diameter of the drill pipe body 12 and the second flow hole of the female joint 13, the expansion tube is expanded by means of a tension tooling expansion.

[0083] Specifically, due to the excessive diameter gap, this may cause the traditional expansion tube 19 design to not fully fit the inner wall of the drill pipe during the expansion process, thereby affecting the sealing performance and structural strength; based on this, in the embodiment of the present application, by opening rectangular slits on the expansion tube 19, the deformation rate of the expansion tube 19 is further increased. This design can ensure that the expansion tube 19 can better adapt to the shape of the inner wall of the drill pipe during the expansion process, thereby improving the sealing performance and structural strength.

[0084] Specifically, the expansion tube 19 is a stainless steel pipe with rectangular slits, and the stainless steel pipe with rectangular slits is a steel pipe with rectangular slits of 10 cm × 0.2 cm opened on the pipe body; the expansion tube 19 is kept in a closed wire-passing drill pipe, and a tension tooling is inserted in the middle and expanded into a perforated shape. This can further increase the deformation rate of the expansion tube 19; as Figure 12 shown, Figure 12 is a schematic structural diagram before the rectangular slit expansion according to an embodiment provided by the present application; as Figure 13 shown, Figure 13 is a schematic structural diagram after the rectangular slit expansion according to an embodiment provided by the present application.

[0085] In one embodiment, in addition to the above-mentioned expansion tube 19 being a stainless steel pipe with open rectangular slits, the expansion tube 19 can also be a tube 20 formed by curling a thin plate; specifically, a thin plate with a thickness of 1.5 mm is curled into a tube 20 with a diameter smaller than the first flow hole and the second flow hole at both ends of the drill pipe, ensuring that the tube 20 can smoothly pass through the drill pipe and enter the predetermined position; as Figure 14 shown Figure 14 is a schematic structural diagram of a tube in an embodiment provided by the present application.

[0086] Specifically, a tension tooling is inserted into the middle of the tube 20; among them, the role of the tension tooling is to apply uniform tension to ensure that the expansion tube 19 can deform uniformly during the expansion process; during the expansion process, the tension is always in contact with the tube and evenly transmits the pressure to the expansion tube wall; this design ensures the uniformity and stability of the expansion process; until after forming, the tension is still all transmitted to the expansion tube 19 and the inner wall of the drill pipe, ensuring that the expansion tube 19 is closely attached to the inner wall of the drill pipe to form a strong support structure.

[0087] In one embodiment, the present application embodiment proposes a threading drill pipe for communication. By designing male and female joints with double shoulders and opening a ring groove on the second shoulder 112 to place an electromagnetic induction coil, the effective laying and protection of the communication cable 16 are realized; the communication cable 16 is laid in the protection conduit 17 and is protected by the protection conduit 17 and the protection gasket 18, and an expansion tube 19 can also be selected as the final protection measure; and the pin jack of the induction coil is connected to the cable plug in a plug-in manner and is externally insulated to ensure that secondary circuits can be generated between communication drill pipes through electromagnetic induction and the signals are sequentially transmitted to the next drill pipe; this design not only solves the problems of cable protection and flexible compensation, but also expands the drilling water hole area by optimizing the gasket shape and reduces the drilling pressure loss; its advantages include: high reliability, good cable protection sealing and compensation, can effectively cope with the complex downhole environment, and the reserved double-channel communication can reduce the risk of communication interruption caused by single-channel cable failure; the composite gasket has a small cross-sectional area, which helps to increase the drilling water hole and reduce the drilling pressure consumption; good processability, high feasibility, and the materials and equipment used are all common components; low cost, and the production can be completed by using daily tooling and process operations.

[0088] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0089] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, provided that these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to cover these modifications and variations.

[0090] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A threading drill pipe for communication, characterized in that, Comprising: A drill pipe body, a male connector, a female connector, a first induction coil, a second induction coil, a protective conduit, a communication cable, and a protective gasket; Wherein, the first end of the drill pipe body is connected to the male connector, and the second end of the drill pipe body is connected to the female connector; the first induction coil is provided at the male connector, and the second induction coil is provided at the female connector; The communication cable is laid inside the protective conduit, and the first end of the communication cable is connected to the first induction coil, and the second end of the communication cable is connected to the second induction coil; The protective conduit is disposed closely against the inner wall of the drill pipe body, and the outer portion of the protective conduit is covered with the protective gasket.

2. The wire threading drill pipe for communication according to claim 1 above, characterized in that, The cross-sectional shape of the protective gasket is crescent-shaped or leaf-shaped.

3. The wire threading drill pipe for communication according to claim 1 above, characterized in that, The first induction coil is provided at the male connector, and the second induction coil is provided at the female connector, specifically including: The male connector is provided with a first shoulder and a second shoulder, wherein, a first coil ring groove is provided at the cross-section of the second shoulder, and the first induction coil is placed in the first coil ring groove; The female connector is provided with a third shoulder and a fourth shoulder, wherein, a second coil ring groove is provided at the cross-section of the fourth shoulder, and the second induction coil is placed in the second coil ring groove.

4. The wire threading drill pipe for communication according to claim 1 above, characterized in that, The second end of the communication cable is connected to the second induction coil, specifically including: The first induction coil is provided with a first coil pin, wherein, a first jack is provided in the first coil pin, the second induction coil is provided with a second coil pin, wherein, a second jack is provided in the second coil pin; The first end of the communication cable is provided with a first plug, the second end of the communication cable is provided with a second plug, the first plug is inserted into the first jack, and the second plug is inserted into the second jack.

5. The thread drilling rod for communication according to claim 1 above, characterized in that, A first current passage hole is provided inside the male connector, the first end of the male connector is a first threaded end, the second end of the male connector is a first friction welding end, and the first current passage hole is composed of a first sub-current passage hole corresponding to the first threaded end and a second sub-current passage hole corresponding to the first friction welding end; The through-hole diameter of the first sub-current passage hole is smaller than the through-hole diameter of the second sub-current passage hole, and the first sub-current passage hole and the second sub-current passage hole are connected by means of a chamfered smooth transition; A second current passage hole is provided inside the female connector, the first end of the female connector is a second threaded end, the second end of the female connector is a second friction welding end, and the second current passage hole is composed of a third sub-current passage hole corresponding to the second threaded end and a fourth sub-current passage hole corresponding to the second friction welding end; The through-hole diameter of the third sub-current passage hole is smaller than the through-hole diameter of the fourth sub-current passage hole, and the third sub-current passage hole and the fourth sub-current passage hole are connected by means of a chamfered smooth transition; Wherein, the through-hole diameters of the second sub-current passage hole and the fourth sub-current passage hole are the same as the inner diameter of the drill pipe body of the drill pipe.

6. The communication threading drill pipe according to claim 5 above, characterized in that, Further comprising: An expansion tube; The expansion tube is arranged inside the drill pipe body, a part of the expansion tube is connected to the inner wall of the drill pipe body, and another part of the expansion tube is connected to the protective gasket; Wherein, the expansion mode of the expansion tube is related to the diameter difference between the first flow hole and the inner diameter of the drill pipe body, or the expansion mode of the expansion tube is related to the diameter difference between the second flow hole and the inner diameter of the drill pipe body, and the expansion mode includes hydraulic expansion or tension tooling expansion.

7. The thread-drilling rod for communication according to claim 1 above, characterized in that, The protective conduit at least includes one first protective conduit, wherein both ends of the protective conduit are flattened and filled with sealant.

8. The wire threading drill pipe for communication according to claim 1 above, characterized in that, The protective gasket is obtained by removing the coating in a preset area inside the drill pipe body to form an exposed metal surface, coating an adhesive on the exposed metal surface, and using a forming extrusion and bonding vulcanization process or a tooling-assisted glue injection and vulcanization process.

9. The wire threading drill pipe for communication according to claim 8 above, characterized in that, The forming extrusion and bonding vulcanization process includes: Preparing an extrusion die tooling, wherein the extrusion die tooling is a crescent-shaped extrusion die tooling or a leaf-shaped extrusion die tooling; Extruding rubber based on the extrusion die tooling to obtain a formed gasket, placing the formed gasket inside the drill pipe body, and vulcanizing the placed formed gasket to form a protective gasket; The tooling-assisted glue injection and vulcanization process includes: Building a rubber forming tooling and a tension holding tooling inside the drill pipe body, the tension holding tooling is placed above the rubber forming tooling, wherein the rubber forming tooling is a crescent-shaped gasket forming tooling or a leaf-shaped gasket forming tooling; Setting glue injection holes at both ends of the drill pipe body, injecting rubber into the rubber forming tooling through the glue injection holes, and performing vulcanization treatment to form a protective gasket.

10. The wire threading drill pipe for communication according to claim 1 above, characterized in that, The protective gasket is obtained by removing the coating in a preset area inside the drill pipe body to form an exposed metal surface, coating an adhesive on the exposed metal surface, and using a glass fiber reinforced plastic forming and bonding process after forming. Wherein, the glass fiber reinforced plastic forming and bonding process after forming includes: Immersing the glass fiber reinforced material in resin, and performing cutting and laminating treatment on the impregnated glass fiber reinforced material to obtain a composite material layer; Performing hot pressing forming and demolding on the composite material layer to obtain a fiber reinforced plastic profile, and performing surface treatment on the fiber reinforced plastic profile to remove the mold release agent and coat a coupling agent; Applying pressure to the fiber reinforced plastic profile and the drill pipe body by using a lead screw tooling, and performing heat curing treatment to bond and form the fiber reinforced plastic profile and the drill pipe body to form a protective gasket.

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