A type of wire-threading drill rod for communication

Abstract

This application relates to a wire-threaded drill rod for communication, comprising: a drill rod 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, a first end of the drill rod body is connected to the male connector, and a second end of the drill rod body is connected to the female connector; the first induction coil is disposed at the male connector, and the second induction coil is disposed at the female connector; the communication cable is laid inside the protective conduit, and a first end of the communication cable is connected to the first induction coil, and a second end of the communication cable is connected to the second induction coil; the protective conduit is disposed close to the inner wall of the drill rod body, and the protective gasket covers the outside of the protective conduit; compared with the prior art, the technical solution of this application improves the flexibility compensation capability and the protective reliability of the communication cable by simultaneously setting the protective conduit and the protective gasket.

Description

Technical Field

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

[0002] In oil drilling engineering, the drill pipe, as the core component of the drill string, undertakes the critical functions of transmitting torque, drilling pressure, and delivering drilling fluid. With the widespread application of measurement-while-drilling (MWD) technology, the types and accuracy of downhole measurement parameters have increased significantly, placing higher demands on data transmission rates, real-time performance, and two-way communication capabilities.

[0003] Currently, although wired communication drill pipes can achieve high-speed, two-way real-time communication through wired transmission technology, their built-in cables are susceptible to harsh environments such as internal pressure, mud erosion, drill pipe bending and twisting deformation, drill string vibration, and local wear and cutting. The current protection methods for cables are to make a groove on the inner wall of the drill pipe, and then fix it with an expansion tube after the wire is threaded through, or fix it with a non-metallic sheath around the inner circumference of the drill pipe.

[0004] However, existing protection solutions have significant drawbacks. For example, using expansion tubes to fix cables after creating grooves in the inner wall of the drill pipe weakens the structural strength of the drill pipe and makes it difficult to achieve complete sealing and dynamic compensation. Existing solutions cannot simultaneously meet the requirements of cable protection reliability and flexible compensation capability. Summary of the Invention

[0005] This application provides a wire-threading drill rod for communication, which improves the flexibility compensation capability and the protection reliability of the communication cable by simultaneously setting a protective conduit and a protective pad.

[0006] In a first aspect, this application provides a wired drill rod for communication, comprising: a drill rod 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, a first end of the drill rod body is connected to the male connector, and a second end of the drill rod body is connected to the female connector; the first induction coil is disposed at the male connector, and the second induction coil is disposed at the female connector; the communication cable is laid inside the protective conduit, and a first end of the communication cable is connected to the first induction coil, and a second end of the communication cable is connected to the second induction coil; the protective conduit is disposed close to the inner wall of the drill rod body, and the protective conduit is covered with the protective gasket.

[0007] In one possible implementation, the protective liner has a crescent or leaf-shaped cross-section.

[0008] In one possible implementation, the male connector is provided with the first induction coil, and the female connector is provided with the second induction coil. Specifically, the male connector is provided with a first shoulder and a second shoulder, wherein the cross-section of the second shoulder is provided with a first coil annular groove, and the first induction coil is placed in the first coil annular groove; the female connector is provided with a third shoulder and a fourth shoulder, wherein the cross-section of the fourth shoulder is provided with a second coil annular groove, and the second induction coil is placed in the second coil annular groove.

[0009] In one possible implementation, 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 the first coil pin is provided with a first socket; the second induction coil is provided with a second coil pin, wherein the second coil pin is provided with a second socket; 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 plugged into the first socket; and the second plug is plugged into the second socket.

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

[0011] In one possible implementation, the communication-use drill rod provided in this application further includes: an expansion tube; wherein the expansion tube is disposed inside the drill rod body, a portion of the expansion tube is connected to the inner wall of the drill rod body, and another portion of the expansion tube is connected to the protective gasket; wherein the expansion method of the expansion tube is related to the diameter difference between the first flow hole and the inner diameter of the drill rod body, or the expansion method of the expansion tube is related to the diameter difference between the second flow hole and the inner diameter of the drill rod body, and the expansion method includes hydraulic expansion or tension tooling expansion.

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

[0013] In one possible implementation, the protective liner is prepared by removing the coating from a predetermined area inside the drill pipe body to form an exposed metal surface, applying an adhesive to the exposed metal surface, and then using a molding extrusion and bonding vulcanization process or a tooling-assisted injection and vulcanization process.

[0014] In one possible implementation, the molding 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 molded liner, placing the molded liner inside the drill pipe body, and vulcanizing the placed molded liner to form a protective liner; the tooling-assisted injection and vulcanization process includes: constructing a rubber molding tooling and a tension holding tooling inside the drill pipe body, wherein the tension holding tooling is placed above the rubber molding tooling, wherein the rubber molding tooling is a crescent-shaped liner molding tooling or a leaf-shaped liner molding tooling; providing injection holes at both ends of the drill pipe body, injecting rubber into the rubber molding tooling through the injection holes, and performing vulcanization to form a protective liner.

[0015] In one possible implementation, the protective gasket is prepared by removing the coating from a predetermined area inside the drill pipe body to form an exposed metal surface, applying an adhesive to the exposed metal surface, and then using a glass fiber reinforced plastic molding and bonding process. The glass fiber reinforced plastic molding and bonding process includes: impregnating glass fiber reinforcing material in resin, cutting and layering the impregnated glass fiber reinforcing material to obtain a composite material layer; hot-pressing and demolding the composite material layer to obtain a fiber-reinforced plastic profile; surface treating the fiber-reinforced plastic profile to remove the release agent and coat it with a coupling agent; applying pressure to the fiber-reinforced plastic profile and the drill pipe body using a lead screw tooling, and performing a thermosetting treatment to bond the fiber-reinforced plastic profile to the drill pipe body, forming the protective gasket.

[0016] This application provides a wire-threading drill rod for communication, which has the following advantages compared with the prior art:

[0017] The communication-use drill pipe 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. 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 located at the male connector, and the second induction coil is located at the female connector. The communication cable is laid inside the protective conduit, with its first end connected to the first induction coil and its second end connected to the second induction coil. The protective conduit is flush against the inner wall of the drill pipe body, and the protective gasket covers its exterior. Compared with existing technologies, this application's technical solution, by embedding the communication cable within a protective conduit flush against the inner wall of the drill pipe and using a flexible protective gasket to buffer external pressure, mud erosion, and dynamic deformation impact, avoids the weakening of structural strength caused by slotting, improves flexibility compensation capability, significantly enhances the reliability of communication cable protection, and maintains the drilling fluid flow area through the compact conduit layout, reducing pressure loss. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a schematic diagram of the structure of one embodiment of a wire-threading drill rod for communication provided in this application;

[0022] Figure 2 This is a schematic diagram of the shoulder structure of one embodiment provided in this application;

[0023] Figure 3 This is a schematic diagram of the connection of a male and female connector according to an embodiment of the present application;

[0024] Figure 4 This is a schematic diagram of the protective conduit arrangement according to one embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the crescent-shaped protective liner under a single protective duct according to an embodiment of this application;

[0026] Figure 6 This is a schematic diagram illustrating the arrangement of a leaf-shaped protective liner under a single protective duct according to an embodiment of this application;

[0027] Figure 7 This is a schematic diagram illustrating the arrangement of the crescent-shaped protective liner under the double-protective duct according to an embodiment of this application;

[0028] Figure 8 This is a schematic diagram illustrating the arrangement of a leaf-shaped protective liner under a double-protective duct according to an embodiment of this application;

[0029] Figure 9 This is a schematic diagram of the expansion tube under the crescent-shaped protective liner according to an embodiment of this application;

[0030] Figure 10 This is a schematic diagram of the expansion tube under the leaf-shaped protective liner according to an embodiment of this application;

[0031] Figure 11 This is a schematic diagram of the structure of a mold assembly according to one embodiment of the present application;

[0032] Figure 12 This is a schematic diagram of the structure of a rectangular slit before expansion, according to one embodiment of this application.

[0033] Figure 13 This is a schematic diagram of the structure of a rectangular slit after expansion according to an embodiment provided in this application;

[0034] Figure 14 This is a schematic diagram of the structure of a tube according to an embodiment provided in this application. Detailed Implementation

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0037] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0038] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0039] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0040] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0041] Example 1, see Figure 1 , Figure 1 This is a schematic diagram of one embodiment of a wire-threading drill rod provided in this application, as shown below. Figure 1 As shown, the communication drill rod includes a male connector 11, a drill rod body 12, a female connector 13, a first induction coil 14, a second induction coil 15, a communication cable 16, a protective conduit 17, and a protective gasket 18, as detailed below:

[0042] In one embodiment, the first end of the drill pipe body 12 is connected to the male connector 11, and the second end of the drill pipe body 12 is connected to the female connector 13.

[0043] Specifically, the drill pipe body 12 is welded together with the male connector 11 and the female connector 13 by friction welding to form a drill pipe; friction welding is a highly efficient welding technology that uses the heat generated by friction to bring the material surface to a plastic state, and then achieves connection under pressure. It has the advantages of fast welding speed, high quality and small deformation.

[0044] Specifically, the first end of the male connector 11 is a first threaded end, the second end of the male connector 11 is a first friction welded end, the first end of the female connector 13 is a second threaded end, and the second end of the female connector 13 is a second friction welded end; wherein, the first end of the drill pipe body 12 is welded to the first friction welded end of the male connector 11 by friction welding, and the second end of the drill pipe body 12 is welded to the second friction welded end of the female connector 13 by friction welding.

[0045] Specifically, the male connector is provided with a first flow passage hole, which is composed of a first sub-flow passage hole corresponding to the first threaded end and a second sub-flow passage hole corresponding to the first friction weld end; the female connector is provided with a second flow passage hole, which is composed of a third sub-flow passage hole corresponding to the second threaded end and a fourth sub-flow passage hole corresponding to the second friction weld end.

[0046] The existing drill pipe body 12 is usually a straight pipe with uniform wall thickness. When the two ends of the pipe body are connected to the male or female connector by friction welding, the inner diameter of the pipe body at the end of the pipe body is usually larger than the diameter of the flow hole of the second sub-flow hole corresponding to the first friction weld end in the male connector 11, and larger than the diameter of the flow hole of the fourth sub-flow hole corresponding to the second friction weld end in the female connector 13. This is because the connector itself needs a thicker wall 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. In subsequent use, it may increase wear due to friction and shorten the service life of the cable.

[0047] Based on this, in order to meet the requirement of protecting the communication cable in a smooth and continuous inner channel, the end of the drill pipe body 12 is thickened by external thickening to increase the outer diameter of the end of the pipe body and increase its wall thickness. This makes the inner diameter of the ends of both sides of the drill pipe body 12 the same as the diameter of the flow hole of the sub-flow hole corresponding to the friction welding end of the male and female connectors. This makes the inner wall of the end of the drill pipe body 12 and the inner wall of the friction welding end corresponding to the male and female connectors achieve a smooth and continuous connection. This provides an ideal channel with a constant inner diameter and no steps for the subsequent installation of protective gaskets and communication cables.

[0048] Specifically, to simplify the manufacturing process, when the drill pipe body 12 is thickened by external thickening, the inner diameter of the drill pipe body 12 is machined to be the same as the diameter of the second sub-flow hole corresponding to the male connector 11 and the diameter of the fourth sub-flow hole corresponding to the female connector 13. That is, the inner diameter of the drill pipe body 12 is the same as the diameter of the second sub-flow hole in the male connector 11 and the diameter of the fourth sub-flow hole in the female connector 13.

[0049] Preferably, after the drill pipe body 12 is thickened, the inner diameter of the middle part of the drill pipe body 12 and the inner diameter of the thickened parts at both ends of the drill pipe body 12 are the same, and the flow hole diameter of the second sub-flow hole in the male connector 11 and the flow hole diameter of the fourth sub-flow hole in the female connector 13 are consistent with the inner diameter of the drill pipe body 12 at the end of the drill pipe body 12; and when the strength is insufficient, the external thickening parameters can be appropriately increased to ensure the strength of the drill pipe.

[0050] Specifically, the male connector 11 is a convex connector, and the female connector 13 is a concave connector, and the convex connector and the concave connector are mutually fitted.

[0051] Specifically, when the male connector 11 is connected to the female connector 13, the first threaded end of the male connector 11 is threadedly connected to the second threaded end of the female connector 13.

[0052] Specifically, the male connector 11 is provided with a first flow passage, which is composed of a first sub-flow passage and a second sub-flow passage. When the first sub-flow passage is located near the first threaded end and the second sub-flow passage is located near the first friction welding end, the diameter of the first sub-flow passage is smaller than the diameter of the second sub-flow passage, and the first sub-flow passage and the second sub-flow passage are connected by a chamfered smooth transition.

[0053] Specifically, the female connector 13 is provided with a second flow passage, which is composed of a third sub-flow passage and a fourth sub-flow passage. When the third sub-flow passage is located near the second threaded end and the fourth sub-flow passage is located near the second friction welding end, the diameter of the third sub-flow passage is smaller than the diameter of the fourth sub-flow passage, and the third sub-flow passage and the fourth sub-flow passage are connected by a chamfered smooth transition.

[0054] Specifically, the transition angle between the male and female connectors at both ends of the drill pipe body 12 is kept consistent in terms of diameter change; this design not only helps to simplify cable laying, but also reduces mechanical stress concentration and improves the overall strength and reliability of the drill pipe.

[0055] In one embodiment, the male connector 11 is provided with the first induction coil 14, and the female connector 13 is provided with the second induction coil 15.

[0056] Specifically, the male connector 11 is provided with a first shoulder 111 and a second shoulder 112, wherein the cross-section of the second shoulder 112 is provided with a first coil annular groove, and the first induction coil 14 is placed in the first coil annular groove; the female connector 13 is provided with a third shoulder 131 and a fourth shoulder 132, wherein the cross-section of the fourth shoulder 132 is provided with a second coil annular groove, and the second induction coil 15 is placed in the second coil annular groove; as shown Figure 2 As shown, Figure 2 This is a schematic diagram of the shoulder structure of one embodiment provided in this application.

[0057] Specifically, the first shoulder 111 is located on the side of the male connector 11 closest to the drill pipe body 12, the second shoulder 112 is located on the side of the male connector 11 furthest from the drill pipe body 12, the third shoulder 131 is located on the side of the female connector 13 furthest from the drill pipe body 12, and the fourth shoulder 132 is located on the side of the female connector 13 closest to the drill pipe body 12.

[0058] Specifically, the cross-sections of the first shoulder 111 and the third shoulder 131 are fitted together after the male and female connectors are connected, and the cross-sections of the second shoulder 112 and the fourth shoulder 132 are fitted together after the male and female connectors are connected.

[0059] In one embodiment, the communication cable 16 is laid inside the protective 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.

[0060] 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.

[0061] Specifically, the communication drill rods transmit the secondary circuit generated by the electromagnetic induction between the first induction coil 14 and the second induction coil 15 to each downward drill rod in sequence.

[0062] Specifically, after the male connector 11 and female connector 13 in different drill pipe bodies 12 are connected, the connection between the male and female connectors is supported by the first induction coil 14 and the second induction coil 15. The induction coils use the principle of electromagnetic induction to transmit current signals.

[0063] Specifically, the first induction coil 14 is provided with a first coil pin 141, wherein the first coil pin 141 is provided with a first socket; the second induction coil 15 is provided with a second coil pin 151, wherein the second coil pin 151 is provided with a second socket; for example Figure 3 As shown, Figure 3 This is a schematic diagram of the connection of a male and female connector according to an embodiment of this application.

[0064] Specifically, the first end of the communication cable 16 is provided with a first plug, and the second end of the communication cable 16 is provided with a second plug. The first plug is inserted into the first socket, and the second plug is inserted into the second socket.

[0065] Specifically, the communication cable 16 includes, but is not limited to, coaxial optical cable or twisted pair cable.

[0066] 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 connected, they are all insulated and protected; preferably, the first induction coil 14 and the second induction coil 15 can be insulated with ceramic coating.

[0067] In one embodiment, if the communication cable 16 is laid directly inside the drill pipe body 12 without any other protection, the drilling mud or cementing cement will damage the cable. Based on this, the present application also provides a protective conduit 17, and lays the communication cable 16 inside the protective conduit 17 so that the protective conduit 17 can withstand the pressure inside the drill pipe cavity and the erosion of the mud, thereby avoiding damage to the communication cable 16.

[0068] In one embodiment, the protective guide tube 17 is disposed close to the inner wall of the drill pipe body 12.

[0069] like Figure 4 As shown, Figure 4 This is a schematic diagram of the protective conduit configuration according to one embodiment of the present application.

[0070] Specifically, the protective conduit 17 includes, but is not limited to, a stainless steel pipe, and the stainless steel pipe is made of materials including, but not limited to, 304 or 316; preferably, the protective conduit 17 may also be made of other composite materials.

[0071] Specifically, during drilling, the drill pipe is subjected to various mechanical forces, including bending, torsion, and tension. If the stainless steel conduit is not pre-stretched, additional tension may be generated inside the conduit when the drill pipe is subjected to bending and torsional forces. This tension may damage the communication cable 16 laid inside the conduit, affecting the reliability of data transmission. Therefore, this application applies a pre-stretching force to the protective conduit 17 before laying, which can eliminate the stress inside the protective conduit 17 in advance, making it more stable during subsequent use and reducing the risk of cable damage caused by mechanical deformation. Furthermore, when the drill pipe undergoes bending and torsional deformation, the protective conduit 17 can also compensate and protect the communication cable 16, reducing the risk of cable damage caused by mechanical deformation.

[0072] Specifically, the protective conduit 17 includes at least one first protective conduit, meaning that the number of protective conduits 17 is at least one; when the number of protective conduits 17 is two, the protective conduit 17 includes a first protective conduit and a second protective conduit. The two protective conduits 17 are used to place two communication cables 16. Both communication cables 16 are connected to the induction coil. One of the two communication cables 16 is used for normal use, and the other is used as a backup to prevent communication loss due to a break in one of the communication cables 16.

[0073] Preferably, since the communication threaded drill rod is placed in the drill string, which is composed of several communication threaded drill rods, and at least one communication cable 16 wrapped by the protective conduit 17 is provided in the communication threaded drill rod, the reliability of drill rod communication can be greatly improved.

[0074] Specifically, the two ends of the protective conduit 17 are flattened and filled with sealant. High-temperature flattening is a heat treatment process that enhances the structural strength of the conduit ends by flattening them at high temperatures, enabling them to better withstand mechanical forces, especially impacts and vibrations that may be encountered during drill pipe connection and use. Furthermore, the flattened conduit ends can better bond with the sealant to form a sealed structure, preventing drilling fluid or other harmful substances from entering the conduit, thereby protecting the communication cable 16 and the plug of the electromagnetic coil.

[0075] In one embodiment, the protective conduit 17 is covered with the protective liner 18.

[0076] 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 drilling fluid, mechanical vibration, bending and twisting deformation, etc. Although the stainless steel pipe itself already provides good protection, in order to further improve the protection performance, a protective gasket 18 is also introduced in this embodiment.

[0077] Specifically, the protective gasket 18 can further enhance the airtightness 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 act as a buffer to reduce the impact of mechanical forces on the communication cable 16 during the drilling process, thereby improving the reliability and service life of the cable.

[0078] Specifically, the cross-sectional shape of the protective liner 18 is crescent-shaped or leaf-shaped; the crescent-shaped or leaf-shaped protective liner occupies less drill pipe water hole space, and will not significantly reduce the fluid channel area inside the drill pipe, thus ensuring the normal flow of drilling fluid; and this shape of liner maintains a large contact length with the inner wall of the drill pipe, which can provide better support and protection, while enhancing the stability of the liner; such as Figure 5 As shown, Figure 5 This is a schematic diagram illustrating the arrangement of a crescent-shaped protective liner under a single protective duct according to an embodiment of this application; as shown... Figure 6 As shown, Figure 6 This is a schematic diagram illustrating the arrangement of a leaf-shaped protective liner under a single protective duct according to an embodiment of this application; as shown. Figure 7 As shown, Figure 7 This is a schematic diagram illustrating the arrangement of a crescent-shaped protective liner under a double-protective duct, according to one embodiment of this application; as shown. Figure 8 As shown, Figure 8 This is a schematic diagram of the leaf-shaped protective liner under the double protective duct according to one embodiment of the present application.

[0079] Specifically, the protective gasket 18 is made of rubber; the rubber includes, but is not limited to, fluororubber and nitrile rubber; wherein, nitrile rubber has the advantages of excellent oil resistance, wear resistance, strong adhesion and low cost, while fluororubber has the characteristics of high temperature resistance.

[0080] In one embodiment, the protective gasket 18 is prepared by removing the coating of a predetermined area inside the drill pipe body 12 to form an exposed metal surface, and then coating the exposed metal surface with an adhesive, using a molding extrusion and adhesive vulcanization process or a tooling-assisted injection and vulcanization process.

[0081] In one embodiment, the molding 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 molding liner, placing the molding liner inside the drill pipe body 12, and performing vulcanization treatment on the placed molding liner to form a protective liner 18.

[0082] Specifically, an extrusion die is prefabricated according to the required shape of the protective liner 18, such as crescent or leaf shape. The shape of this die determines the final shape of the protective liner 18. The coating on the part of the drill pipe body 12 that needs to be bonded to the rubber is removed to ensure that the rubber can be firmly bonded to the inner wall of the drill pipe body 12. Rubber adhesive is applied to the exposed metal parts to enhance the bonding strength between the rubber and the inner wall of the drill pipe body 12. The rubber is extruded through the prefabricated extrusion die to form the required shape of the protective liner 18. The protective liner 18 is placed in an appropriate position on the inner wall of the drill pipe body 12. When the protective liner 18 is fixed to the inner wall of the drill pipe body 12, it is vulcanized to give the protective liner 18 better physical properties and chemical stability.

[0083] In one embodiment, the tooling-assisted injection and vulcanization process includes: constructing a rubber molding tooling and a tension holding tooling inside the drill pipe body 12, with the tension holding tooling placed above the rubber molding tooling, wherein the rubber molding tooling is a crescent-shaped pad molding tooling or a leaf-shaped pad molding tooling; providing injection holes at both ends of the drill pipe body 12, injecting rubber into the rubber molding tooling through the injection holes, and performing vulcanization treatment to form a protective pad 18.

[0084] Specifically, the coating on the inner wall of the drill pipe body 12 where the rubber needs to be bonded is removed to ensure that the rubber can be firmly bonded to the inner wall of the drill pipe body 12. Rubber adhesive is applied to the exposed metal parts to enhance the bonding strength between the rubber and the inner wall of the drill pipe body 12. A rubber molding fixture is used to inject rubber into the inner wall of the drill pipe body 12, followed by vulcanization. The rubber injection fixture includes sealing both ends of the drill pipe body 12 and opening injection holes, vent holes, and tension holding fixtures at both ends. A tension holding fixture is placed above the molding fixture to prevent rubber from overflowing from the gap between the molding fixture and the drill pipe wall. Rubber is injected into the rubber molding fixture through the injection holes to ensure that the rubber is evenly filled within the molding fixture.

[0085] Specifically, when constructing the rubber molding fixture within the drill pipe body 12, the crescent-shaped liner molding fixture can be made from a flat-cut metal plate; the leaf-shaped liner molding fixture can be made from a cut metal pipe or from a bent metal plate.

[0086] In one embodiment, the protective liner is prepared by removing the coating from a predetermined area inside the drill pipe body to form an exposed metal surface, applying an adhesive to the exposed metal surface, and then using a glass fiber reinforced plastic molding and bonding process.

[0087] In one embodiment, the bonding process after molding the glass fiber reinforced plastic includes: impregnating the glass fiber reinforcing material in resin, and cutting and laminating the impregnated glass fiber reinforcing material to obtain a composite material layer; hot-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 coat it with a coupling agent; applying pressure to the fiber-reinforced plastic profile and the drill pipe body using a lead screw tooling, and performing thermosetting treatment to bond the fiber-reinforced plastic profile and the drill pipe body together to form a protective gasket.

[0088] Specifically, the process of preparing the protective gasket 18 using glass fiber reinforced plastic and post-molding bonding technology is illustrated with an example. The glass fiber reinforced plastic and post-molding bonding process includes: impregnating glass fiber reinforcing material in resin; cutting the impregnated glass fiber reinforcing material into a predetermined shape and performing a layering process to form a composite material layer; pre-embedding a conduit in the composite material layer; placing the composite material layer into a mold and performing hot pressing; removing the molded fiber-reinforced plastic profile from the mold to complete demolding; removing the coating from the inner wall of the drill pipe body 12 where bonding is required; wiping the inside of the drill pipe body with acetone to ensure no residual dust; applying adhesive to exposed metal parts; sanding the fiber-reinforced plastic profile with sandpaper to remove the release agent; 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 thermosetting treatment to bond the fiber-reinforced plastic profile and the drill pipe body together to form the protective gasket.

[0089] Preferably, the protective conduit 17 is also designed to bend towards and fit tightly against the borehole 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 hole usually increases in some places to facilitate the installation and laying of the communication cable 16. In the places where the flow hole increases in size, the protective conduit 17 is designed to bend towards and fit tightly against the borehole wall. This design can ensure that the conduit can better adapt to the shape of the borehole wall during installation and reduce the installation difficulties caused by changes in borehole diameter. At the same time, in order to facilitate the prefabrication and installation of the protective gasket 18, a hole is left at the position of the protective conduit 17 when the protective gasket 18 is set. This 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.

[0090] In one embodiment, the combination of the protective conduit 17 and the protective gasket 18 can not only effectively solve the protection and flexibility compensation problems of the communication cable 16, but also expand the drilling water hole area and reduce drilling pressure loss through optimized design. This design improves the cable protection performance and the overall performance and reliability of the drill pipe system, and is suitable for a variety of complex application scenarios in modern oil drilling engineering.

[0091] In one embodiment, the communication wire-threading drill rod provided in this application further includes an expansion tube 19; wherein, the expansion tube 19 is disposed inside the drill rod tube body 12, a portion of the expansion tube 19 is connected to the inner wall of the drill rod tube body 12, and the other portion of the expansion tube 19 is connected to the protective gasket 18.

[0092] Specifically, the expansion method 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 method of the expansion tube is related to the diameter difference between the second flow hole and the inner diameter of the drill pipe body. The expansion method includes hydraulic expansion or tension tooling expansion.

[0093] 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 hole of the male connector 11, or between the inner diameter of the drill pipe body 12 and the second flow hole of the female connector 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 disposed inside the drill pipe body 12, and a portion of the expansion tube 19 is connected to the inner wall of the drill pipe body 12. The other part is connected to the protective liner 18. After expansion, the expansion tube 19 fits tightly against the inner wall of the drill pipe body 12 where there is no protective liner 18, and fits tightly against the protective liner 18 where there is a protective liner 18, forming a solid support structure that can effectively prevent the protective liner 18 from shifting or being damaged under mechanical force. In addition, the expansion process of the expansion tube 19 can fill the tiny gap between the protective liner 18 and the inner wall of the drill pipe, forming a sealing layer to prevent drilling fluid or other harmful substances from entering the interior of the protective liner 18, further protecting the communication cable 16.

[0094] Specifically, when the diameter difference between the inner diameter of the drill pipe body 12 and the first flow hole of the male connector 11, or between the inner diameter of the drill pipe body 12 and the second flow hole of the female connector 13, is small, the expansion tube is expanded using hydraulic expansion; for example, high-pressure water expansion is used at room temperature until the sleeve of the expansion tube 19 is completely fitted to the inner wall of the drill pipe and the protective gasket 18. Figure 9 As shown, Figure 9 This is a schematic diagram of the expansion tube arrangement under the crescent-shaped protective liner according to one embodiment of this application; as shown Figure 10 As shown, Figure 10 This is a schematic diagram of the expansion tube under the leaf-shaped protective liner according to one embodiment of the present application.

[0095] Specifically, the expansion tube 19 adopts a thin-walled tube design with a diameter slightly smaller than the minimum inner diameter of the drill pipe; this design allows the expansion tube 19 to be smoothly inserted into the drill pipe and to fit evenly against the inner wall of the drill pipe during the expansion process.

[0096] Preferably, the initial diameter of the expansion tube 19 is 80 mm, which can be expanded to 110 mm 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 expansion, enabling it to fit tightly against the inner wall of the drill pipe and form a robust support structure. Once the expansion tube 19 expands and deforms, the ability of water to overflow into the large-diameter cavity will be greatly reduced, further improving the sealing performance. This design not only improves the fit between the expansion tube 19 and the inner wall of the drill pipe, but also enhances the sealing performance of the entire structure.

[0097] Preferably, the expansion tube 19 is a seamless stainless steel pipe, which is made of a tough pipe material, such as annealed 304 / 316 stainless steel pipe; these materials have good toughness and plasticity, and can achieve large deformation under high pressure without breaking.

[0098] Specifically, the hydraulic expansion process of the expansion tube 19 includes: the expansion tube 19 is placed in a closed mold assembly. The mold assembly provides a controlled environment to ensure the uniformity and safety of the expansion process. The first end of the mold assembly is sealed, and pressure regulating devices such as throttle valves and pressure gauges are added. These devices are used to control and monitor the pressure during the expansion process, ensuring that the expansion process is within a safe range. The second end of the mold assembly is also sealed, and pressure regulating devices such as throttle valves and pressure gauges are added. These devices are used to control and monitor the pressure during the expansion process, ensuring that the expansion process is within a safe range. 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 mold assembly. These sealing elements effectively prevent high-pressure water leakage, ensuring the smooth progress of the expansion process. Figure 11 As shown, Figure 11 This is a schematic diagram of the structure of a mold assembly according to one embodiment of the present application.

[0099] Specifically, in the drill pipe design, when there is a large difference in diameter between the inner diameter of the drill pipe body 12 and the first flow hole of the male connector 11, or between the inner diameter of the drill pipe body 12 and the second flow hole of the female connector 13, the expansion tube is expanded by means of tension tooling.

[0100] Specifically, due to the large diameter difference, the traditional expansion tube 19 design may not be able to fully fit the inner wall of the drill pipe during the expansion process, thus affecting the sealing performance and structural strength. Based on this, in this embodiment, a rectangular slit is opened on the expansion tube 19 to further increase the deformation rate of the expansion tube 19. 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.

[0101] Specifically, the expansion tube 19 is a stainless steel pipe with a rectangular slit, which is a steel pipe with a rectangular slit of 10cm × 0.2cm cut into its body; the expansion tube 19 is held in a closed threaded drill rod, with a tensioning device inserted in the middle, expanding into a perforated shape. This can further increase the deformation rate of the expansion tube 19; such as Figure 12 As shown, Figure 12 This is a schematic diagram of the structure of a rectangular slit before expansion, according to an embodiment provided in this application; as shown. Figure 13 As shown, Figure 13 This is a schematic diagram of the structure of a rectangular slit after expansion according to an embodiment of this application.

[0102] In one embodiment, besides the expansion tube 19 being a stainless steel pipe with a rectangular slit, the expansion tube 19 can also be a tube 20 formed by rolling a thin plate; specifically, a 1.5mm thick thin plate is rolled into a tube 20 with a diameter smaller than the first and second flow holes at both ends of the drill rod, ensuring that the tube 20 can smoothly pass through the drill rod and enter the predetermined position; such as Figure 14 As shown, Figure 14 This is a schematic diagram of the structure of a tube according to an embodiment provided in this application.

[0103] Specifically, a tensioning fixture is inserted into the middle of the tube 20. The function of the tensioning fixture 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 the pressure is uniformly transmitted to the expansion tube wall. This design ensures the uniformity and stability of the expansion process. Even after forming, the tension is still fully transmitted to the expansion tube 19 and the inner wall of the drill pipe, ensuring that the expansion tube 19 fits tightly with the inner wall of the drill pipe to form a solid support structure.

[0104] In one embodiment, this application proposes a communication drill rod. By designing a double-shoulder male-female connector and creating an annular groove on the second shoulder 112 to house an electromagnetic induction coil, effective laying and protection of the communication cable 16 are achieved. The communication cable 16 is laid within a protective conduit 17 and protected by the protective conduit 17 and a protective gasket 18. An expansion tube 19 can also be optionally added as a final protection measure. Furthermore, the pin sockets of the induction coil are connected to the cable plug via a plug-in connection and are externally insulated, ensuring that the communication drill rods can generate a secondary circuit through electromagnetic induction, sequentially transmitting the signal... The cable is then passed to the next drill pipe. This design not only solves the problems of cable protection and flexibility compensation, but also increases the drilling water hole area by optimizing the liner shape, thus reducing drilling pressure loss. Its advantages include: high reliability, good cable protection sealing and compensation, effective response to complex downhole environments, and reserved dual-channel communication to reduce the risk of communication interruption due to single-channel cable failure; small cross-sectional area of ​​composite material liner helps to increase the drilling water hole and reduce drilling pressure loss; good processability and high feasibility, with all materials and equipment used being common components; low cost, and can be manufactured using routine tooling and process operations.

[0105] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0106] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0107] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A wire-threading drill rod for communication, characterized in that, include: Drill pipe body, male connector, female connector, first induction coil, second induction coil, protective conduit, communication cable, protective gasket and expansion tube; 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 installed close to the inner wall of the drill pipe body, and the protective conduit is covered with the protective liner. Before installation, a pre-tension force is applied to the protective conduit. The protective liner is made of rubber. The protective liner is prepared by removing the coating of a predetermined area inside the drill pipe body to form an exposed metal surface, and then coating the exposed metal surface with an adhesive, using a molding extrusion and bonding vulcanization process or a tooling-assisted injection and vulcanization process. The molding 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 molding liner, placing the molding liner inside the drill pipe body, and performing vulcanization treatment on the placed molding liner to form a protective liner. The tooling-assisted injection and vulcanization process includes: constructing a rubber molding tooling and a tension holding tooling inside the drill pipe body, with the tension holding tooling placed above the rubber molding tooling, wherein the rubber molding tooling is a crescent-shaped pad forming tooling or a leaf-shaped pad forming tooling; providing injection holes at both ends of the drill pipe body, injecting rubber into the rubber molding tooling through the injection holes, and performing vulcanization treatment to form a protective pad; The male connector has a first flow hole inside, 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 flow hole is composed of a first sub-flow hole corresponding to the first threaded end and a second sub-flow hole corresponding to the first friction welding end. The diameter of the first sub-flow orifice is smaller than that of the second sub-flow orifice, and the first sub-flow orifice and the second sub-flow orifice are connected by a chamfered smooth transition. The female connector is provided with a second flow hole inside. 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 flow hole is composed of a third sub-flow hole corresponding to the second threaded end and a fourth sub-flow hole corresponding to the second friction welding end. The diameter of the third sub-flow hole is smaller than that of the fourth sub-flow hole, and the third sub-flow hole and the fourth sub-flow hole are connected by a chamfered smooth transition. Wherein, the diameter of the second sub-flow hole and the diameter of the fourth sub-flow hole are the same as the inner diameter of the drill pipe body. The expansion tube is disposed inside the drill pipe body, a portion of the expansion tube is connected to the inner wall of the drill pipe body, and the other portion of the expansion tube is connected to the protective gasket. The expansion method 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 method of the expansion tube is related to the diameter difference between the second flow hole and the inner diameter of the drill pipe body. The expansion method includes hydraulic expansion or tension tooling expansion. The expansion tube is a stainless steel pipe with a rectangular slit or a tube made of thin plate rolled up.

2. The communication threading drill rod as described in claim 1, characterized in that, The protective liner has a crescent or leaf-shaped cross-section.

3. The communication threading drill rod as described in claim 1, characterized in that, The male connector is provided with the first induction coil, and the female connector is provided with the second induction coil, 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 the cross-section of the fourth shoulder is provided with a second coil ring groove, and the second induction coil is placed in the second coil ring groove.

4. The communication threading drill rod as described in claim 1, 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 the first coil pin is provided with a first socket; the second induction coil is provided with a second coil pin, wherein the second coil pin is provided with a second socket. The communication cable has a first plug at one end and a second plug at the other end. The first plug is inserted into the first socket and the second plug is inserted into the second socket.

5. The communication threading drill rod as described in claim 1, characterized in that, The protective conduit includes at least one first protective conduit, wherein both ends of the protective conduit are flattened and filled with sealant.

6. The communication threading drill rod as described in claim 1, characterized in that, The protective liner is prepared by removing the coating in a predetermined area inside the drill pipe body to form an exposed metal surface, applying an adhesive to the exposed metal surface, and then using a glass fiber reinforced plastic molding and bonding process. The bonding process after molding of the glass fiber reinforced plastic includes: Glass fiber reinforcement material is impregnated in resin, and the impregnated glass fiber reinforcement material is cut and laminated to obtain a composite material layer; The composite material layer is hot-pressed and demolded to obtain a fiber-reinforced plastic profile. The fiber-reinforced plastic profile is then surface-treated to remove the release agent and coat it with a coupling agent. Pressure is applied to the fiber-reinforced plastic profile and the drill pipe body using a lead screw tool, and then thermosetting is performed to bond the fiber-reinforced plastic profile to the drill pipe body to form a protective gasket.

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