Cable laying rod and pipe connecting device

Abstract

The invention relates to the technical field of well drilling, and discloses a cable laying rod pipe connecting device which is used for connecting an upper cable laying rod pipe and a lower cable laying rod pipe and comprises an upper connector arranged at the end of the upper cable laying rod pipe and internally provided with a through hole used for installing a cable; the lower joint is arranged at the end part of the lower cable laying rod pipe, and a through hole for mounting a cable is formed in the lower joint; the spiral sleeve is in threaded connection with the lower joint, is sleeved outside the upper joint and the lower joint and is used for pressing the upper joint on the lower joint; one of the upper connector and the lower connector is provided with a cable plug, the other one of the upper connector and the lower connector is provided with a cable socket matched with the cable plug in an inserted mode, the upper connector is provided with an upper torque bearing part, and the lower connector is provided with a lower torque bearing part connected with the upper torque bearing part in a clamped mode so that the cable plug can be prevented from rotating relative to the cable socket when the spiral sleeve is rotated. According to the utility model, the screw thread pair can be used for quickly butting the rod pipe, the installation efficiency is high, the plugging requirement of the cable joint is met, and efficient transmission of high-voltage electric power and data signals between cable laying rod pipes is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling, and more particularly to a cable-laying rod-pipe connecting device. Background Art

[0002] In the fields of oil and gas drilling, geological exploration and mining drilling, seamless rods and pipes play an important role in transmitting drilling pressure, torque and conveying drilling fluid. Existing rods and pipes are all connected by spiral pairs, which have high connection efficiency. However, there are no cables inside the seamless rods and pipes, and high-voltage power and data signals cannot be transmitted. Data can only be transmitted by mud pressure pulses, which has low transmission efficiency.

[0003] In order to improve the transmission efficiency of data signals, cables are currently installed inside pole pipes, and electromagnetic induction coils are installed at the joints of the pole pipes. When the pole pipes are spirally connected, the cables on both sides can still be connected through the electromagnetic induction coils. Although the above structure greatly improves the data transmission efficiency, it still cannot achieve the connection of high-voltage power.

[0004] In summary, how to use poles and pipes to efficiently transmit high-voltage electricity and data signals is a problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a cable laying rod and pipe connecting device, which can not only utilize a threaded pair to quickly connect the rod and pipe and have high installation efficiency, but also meet the plug-in requirements of the cable connector, thereby realizing efficient transmission of high-voltage power and data signals between the cable laying rods and pipes.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A cable laying rod pipe connecting device, used for connecting an upper cable laying rod pipe and a lower cable laying rod pipe, comprising:

[0008] An upper joint, arranged at the end of the upper cable rod tube, and having a through hole for installing cables;

[0009] A lower joint, arranged at the end of the lower cable laying rod tube, and provided with a through hole for installing cables;

[0010] A spiral sleeve threadedly connected to the lower joint, sleeved outside the upper joint and the lower joint, used to press the upper joint onto the lower joint;

[0011] One of the upper joint and the lower joint is provided with a cable plug, and the other is provided with a cable socket that is plugged into and matched with the cable plug. The upper joint is provided with an upper torsion-bearing portion, and the lower joint is provided with a lower torsion-bearing portion that is snap-connected to the upper torsion-bearing portion to prevent the cable plug from rotating relative to the cable socket when the spiral sleeve is rotated.

[0012] Preferably, at least one connecting key is provided on the outer circumference of one of the upper joint and the lower joint, and a key groove which is engaged with the connecting key is provided on the inner circumference of the other joint.

[0013] Preferably, the connection keys are evenly distributed along the circumferential direction of the upper joint or along the circumferential direction of the lower joint.

[0014] Preferably, the cable plugs are evenly distributed along the circumferential direction of the upper connector or along the circumferential direction of the lower connector.

[0015] Preferably, the outer periphery of the upper joint is provided with a positioning step and the upper torsion portion from top to bottom, and the inner periphery of the lower joint is provided with an inner positioning step surface for abutting against the bottom surface of the upper torsion portion.

[0016] Preferably, the cable plug is arranged on the bottom surface of the positioning step, and the bottom of the cable plug is higher than the connecting end surface of the bottom of the upper connector.

[0017] Preferably, at least one sealing member is provided between the top surface of the positioning step and the spiral sleeve, and at least one sealing member is provided between the outer circumferential surface of the positioning step and the inner circumferential surface of the spiral sleeve.

[0018] Preferably, the cable is laid in the through hole of the upper connector or the through hole of the lower connector through an insulating layer.

[0019] Preferably, the cable is spirally wound in the upper joint and the lower joint.

[0020] The cable laying rod pipe connecting device provided by the present invention is arranged between the upper and lower cable laying rod pipes with cables inside. The cables in the upper and lower cable laying rod pipes can be electrically connected through a cable plug and a cable socket. The upper joint can be pressed onto the lower joint by rotating the spiral sleeve, and the upper joint will not rotate with the spiral sleeve when the upper and lower joints are connected, thereby avoiding the cable plug from rotating relative to the cable socket and damaging the cable joint.

[0021] Therefore, the cable laying rod and pipe connection device provided by the present invention can not only utilize the threaded pair to quickly connect the rod and pipe, with high installation efficiency, but also meet the plug-in requirements of the cable connector, thereby realizing efficient transmission of high-voltage power and data signals between the cable laying rods and pipes.

[0022] The upper torsion bearing part and the lower torsion bearing part can be collectively referred to as the torsion bearing part, and the upper joint and the lower joint can be collectively referred to as the joint. When the torsion bearing part is provided with an inwardly concave limiting groove, considering that the torque at the rod-tube connection during the cable laying rod-tube operation can reach 10 3 -10 4 N·m, and the wall thickness of the joint is usually about 10mm. In order to ensure the torsional strength of the joint and the torsion bearing part, the torsion bearing part and the joint are usually set as an integrated structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a specific embodiment of the cable laying rod-tube connection provided by the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the upper joint and the spiral sleeve on the AA section;

[0026] Figure 3 It is a schematic diagram of the structure of the lower joint on the BB section;

[0027] Figure 4 This is a local enlarged view of area C.

[0028] Figure 1-Figure 4 middle:

[0029] 1 is an upper joint, 11 is an upper torsion bearing part, 12 is a positioning step, 2 is a lower joint, 21 is a lower torsion bearing part, 22 is an inner positioning step surface, 3 is a spiral sleeve, 4 is a cable plug, 5 is a cable socket, 6 is a cable, and 7 is an insulating layer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The core of the present invention is to provide a cable laying rod and pipe connection device, which can not only use threaded pairs to quickly connect the rod and pipe, with high installation efficiency, but also meet the plug-in requirements of cable connectors, and realize efficient transmission of high-voltage power and data signals between cable laying rods and pipes.

[0032] The cable-laying rod-tube connecting device provided by the present invention is used to connect an upper cable-laying rod tube and a lower cable-laying rod tube, and comprises:

[0033] The upper joint 1 is arranged at the end of the upper cable rod pipe, and is provided with a through hole for installing the cable 6;

[0034] The lower joint 2 is provided at the end of the lower cable rod pipe and is provided with a through hole for installing the cable 6;

[0035] The spiral sleeve 3 is threadedly connected to the lower joint 2, and is sleeved outside the upper joint 1 and the lower joint 2, and is used to press the upper joint 1 onto the lower joint 2;

[0036] One of the upper joint 1 and the lower joint 2 is provided with a cable plug 4, and the other is provided with a cable socket 5 which is plugged into and matched with the cable plug 4. The upper joint 1 is provided with an upper torsion portion 11, and the lower joint 2 is provided with a lower torsion portion 21 which is snap-connected to the upper torsion portion 11 to prevent the cable plug 4 from rotating relative to the cable socket 5 when the spiral sleeve 3 is rotated.

[0037] Among them, the upper joint 1 and the lower joint 2 can be collectively referred to as joints, the upper torsion receiving part 11 and the lower torsion receiving part 21 can be collectively referred to as torsion receiving parts, and the cable plug 4 and the cable socket 5 can be collectively referred to as cable joints.

[0038] The upper joint 1 is arranged at the bottom of the upper cable rod pipe, and the lower joint 2 is arranged at the top of the lower cable rod pipe. Considering that multiple cable rod pipes need to be connected in series during drilling, in order to save the connection identification process of the cable rod pipes, an upper joint 1 and a lower joint 2 can be set at both ends of the cable rod pipe.

[0039] Taking into account the connection sealing and connection strength, the upper joint 1, the lower joint 2 and the cable laying rod tube can be welded, threaded, or set as an integral structure.

[0040] The upper joint 1 and the lower joint 2 are both provided with through holes for installing the cable 6, and the through hole of the upper joint 1 is connected with the through hole of the upper cable rod pipe, and the through hole of the lower joint 2 is connected with the through hole of the lower cable rod pipe;

[0041] In order to electrically connect the cable 6 to the cable connector, the wall surface of the upper connector 1 and the wall surface of the lower connector 2 are provided with oblique holes for the cable to pass through, and the size of the oblique holes is determined according to the diameter of the cable 6 in actual production.

[0042] In order to avoid external interference with the transmission of high-voltage current or signals in the cable 6, it is preferred that the cable 6 is laid in the through hole of the upper connector 1 or the through hole of the lower connector 2 through an insulating layer 7, and the insulating layer 7 is used to isolate the inner wall surface of the through hole of the connector and the insulating skin of the cable 6.

[0043] The insulating layer 7 is mostly made of highly elastic and high-temperature resistant materials with good tensile properties. It can withstand the large tensile force when the drill rod is working, avoid being pulled apart and causing the cable 6 to be exposed, and has good high-temperature performance, and can work normally in harsh environments; the insulating layer 7 is usually bonded to the inner wall surface of the through hole.

[0044] When the drill pipe is working, the cable 6 is subjected to a large tensile force, and a 3000m long cable 6 will be stretched by about 1m. To prevent the cable 6 from being broken in the rod tube, preferably, the cable 6 can be spirally wound in the upper joint 1 and the lower joint 2 to improve the tensile performance of the cable 6.

[0045] The pitch of the helically wound cable 6 is determined according to the material of the cable 6 and the calculated deformation amount in actual production, and will not be elaborated here.

[0046] The upper joint 1 and the lower joint 2 are connected by an upper torsion bearing part 11 and a lower torsion bearing part 21. The upper torsion bearing part 11 and the lower torsion bearing part 21 are not only used to bear torque, but also to prevent the upper joint 1 from rotating relative to the lower joint 2, so as to avoid relative rotation between the cable joint 4 and the cable socket 5, which may cause damage to the pins of the cable plug 4.

[0047] The upper torsion bearing part 11 and the lower torsion bearing part 21 can be configured as limiting protrusions and limiting grooves of any shape, as long as the two can be snap-fitted and smoothly assembled in place along the axial direction;

[0048] Considering the difficulty of processing and assembly, the upper torsion bearing part 11 and the lower torsion bearing part 21 are usually set as keyway structures, please refer to Figure 2 and Figure 3 The outer circumference of one of the upper joint 1 and the lower joint 2 is provided with at least one connecting key, and the inner circumference of the other is provided with a key groove engaged with the connecting key.

[0049] In order to effectively prevent the upper joint 1 from twisting relative to the lower joint 2, the keyway structure can be provided at one, two or more locations; in order to make the torsional stress distribution in the joint relatively uniform and reduce local stress, preferably, the connecting keys can be arranged to be evenly distributed along the circumferential direction of the upper joint 1 or the circumferential direction of the lower joint 2.

[0050] When the torsion receiving part is provided with a limiting protrusion protruding outward, the torsion receiving part can be designed as an integral part with the joint or separately from the joint;

[0051] When the torsion bearing part is provided with an inwardly recessed limiting groove such as a keyway, considering that the torque at the rod-tube connection during the cable laying rod-tube operation can reach 10 3 -10 4 N·m, the wall thickness of the joint is usually 10mm. In order to ensure the torsional strength of the joint and the torsion bearing part, the torsion bearing part and the joint are usually set as an integrated structure.

[0052] Taking into account that the connecting end face of the upper joint 1 touches the ground when the pole pipe is stored, in order to avoid the pin of the cable plug 4 from touching the ground and being damaged, it should be noted that the bottom of the pin of the cable plug 4 should be higher than the connecting end face at the bottom of the upper joint 1. Therefore, the cable plug 4 can only be arranged on the outer periphery of the upper joint 1, the cable socket 5 can be arranged on the outer periphery and the connecting end face of the upper joint 1, and the cable plug 4 can be arranged on the outer periphery or the connecting end face of the lower joint 2.

[0053] The specific types, quantities, structures and distributions of the cable plugs 4 and the cable sockets 5 are determined according to the types, quantities and sizes of the cables in the cable rod tube in actual production, etc., with reference to the prior art. For example, the cable plugs 4 can be arranged to be evenly distributed along the circumferential direction of the upper joint 1 or the circumferential direction of the lower joint 2, such as Figure 2 shown.

[0054] The spiral sleeve 3 is used to compress the upper joint 1 and the lower joint 2 to connect the upper and lower cable rod pipes. In order to facilitate the spiral sleeve 3 to better compress the lower joint 2, preferably, please refer to Figure 1 The contact surface between the spiral sleeve 3 and the lower joint 2 can be set as an inclined conical surface, so that the contact area is larger and the friction between the two is stronger.

[0055] When connecting the cable rod pipe, first rotate the spiral sleeve 3 to expose the lower torsion part 21 of the lower joint 2; then rotate the cable plug 4 and the cable socket 5, and gradually insert the upper joint 1 into the lower joint 2, so that the upper torsion part 11 and the lower torsion part 21 form a clamping structure; finally rotate the spiral sleeve 3 to press the upper joint 1 onto the lower joint 2 to complete the docking operation of the cable rod pipe. At this time, the thread pair can transmit axial tension or axial pressure, and the torsion part can transmit torque.

[0056] When the construction and disassembly of the cable laying rod pipe are completed, first fix the lower joint 2 and screw the spiral sleeve 3 in reverse; when the spiral sleeve 3 is disengaged from the thread of the lower joint 2, move the upper joint 1 in reverse, separate the upper torsion part 11 and the lower torsion part 21, and separate the cable plug 4 from the cable socket 5. At this time, the disassembly of the cable laying rod pipe is completed.

[0057] In this embodiment, the cables 6 in the upper and lower cable laying rod tubes can be electrically connected through the cable plug 4 and the cable socket 5. The rotating spiral sleeve 3 can press the upper joint 1 onto the lower joint 2. When the upper and lower joints are connected, the upper joint 1 will not rotate with the spiral sleeve 3, thereby preventing the cable plug 4 from rotating relative to the cable socket 5 and damaging the cable joint.

[0058] Therefore, the above-mentioned cable laying rod and pipe connection device can not only utilize the threaded pair to quickly connect the rod and pipe, with high installation efficiency, but also meet the plug-in requirements of the cable connector, thereby realizing efficient transmission of high-voltage power and data signals between the cable laying rods and pipes.

[0059] In addition, the provision of the spiral sleeve 3 provides an additional sealing structure between the spiral sleeve 3 and the joint at the rod-pipe connection, which can better prevent leakage and erosion of the drilling fluid.

[0060] Based on the above embodiment, in order to better tighten the upper joint 1 and the lower joint 2, please refer to Figure 1 The outer periphery of the upper joint 1 is provided with a positioning step 12 and an upper torsion portion 11 from top to bottom, and the inner periphery of the lower joint 2 is provided with an inner positioning step surface 22 for abutting against the bottom surface of the upper torsion portion 11.

[0061] Please refer to Figure 1 When the spiral sleeve 3 is screwed into place, the top surface of the positioning step 12 abuts against the upper positioning step surface of the spiral sleeve 3, the bottom surface of the positioning step 12 abuts against the lower joint 2, and the connecting end surface of the upper joint 1 and the bottom surface of the upper torsion portion 11 both abut against the inner positioning step surface 22.

[0062] In this embodiment, the design of the positioning step 12 and the inner positioning step surface 22 allows the upper joint 1 to be partially inserted into the lower joint 2, which not only increases the contact area between the upper joint 1 and the lower joint 2, which is beneficial to the tight crimping of the upper joint 1 and the lower joint 2, but also ensures that the upper torsion portion 11 and the lower torsion portion 21 are snapped into place.

[0063] Preferably, a lower positioning step surface for abutting against the connecting end surface of the lower joint 2 can be provided in the spiral sleeve 3. When the lower positioning step surface abuts against the outer area c of the connecting end surface of the lower joint 2, the bottom surface of the positioning step 12 abuts against the inner area d of the connecting end surface of the lower joint 2. Figure 1 and Figure 4 shown.

[0064] On the basis of the above embodiment, in order to prevent the pins of the cable plug 4 from touching the ground, the cable plug 4 can be arranged to be located at the bottom surface of the positioning step 12, and the bottom of the cable plug 4 is higher than the connecting end surface of the bottom of the upper connector 1.

[0065] Therefore, the distance from the positioning step 12 to the connecting end face of the upper connector 1 should be greater than the length of the cable plug 4 .

[0066] To prevent drilling fluid from leaking out from the connection between the spiral sleeve 3 and the upper joint 1, please refer to Figure 1 At least one sealing member is provided between the top surface a of the positioning step 12 and the spiral sleeve 3 , and at least one sealing member is provided between the outer circumferential surface b of the positioning step 12 and the inner circumferential surface of the spiral sleeve 3 .

[0067] The sealing member is usually provided as a sealing ring. The specific type, size, quantity and distribution of the sealing ring are determined according to the actual production needs and will not be elaborated here.

[0068] In a specific embodiment, the outer periphery of the upper joint 1 is provided with a positioning step 12, the outer periphery of the lower joint 2 is provided with an outer positioning step surface for abutting against the bottom surface of the spiral sleeve 3, and the inner periphery of the lower joint 2 is provided with an inner positioning step surface 22 for abutting against the connecting end surface at the bottom of the upper joint 1;

[0069] An upper positioning step surface for abutting against the top surface of the positioning step 12 and a lower positioning step surface for abutting against the connecting end surface of the lower joint 2 are respectively provided in the spiral sleeve 3 .

[0070] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0071] The cable laying rod-tube connection device provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A cable-laying rod-tube connecting device, used to connect an upper cable-laying rod tube and a lower cable-laying rod tube, characterized in that: include: An upper joint (1) is arranged at the end of the upper cable rod tube and is provided with a through hole for installing a cable (6); A lower joint (2) is arranged at the end of the lower cable laying rod tube and is provided with a through hole for installing a cable (6); a spiral sleeve (3) threadedly connected to the lower joint (2), sleeved outside the upper joint (1) and the lower joint (2), and used for pressing the upper joint (1) onto the lower joint (2); One of the upper joint (1) and the lower joint (2) is provided with a cable plug (4), and the other is provided with a cable socket (5) pluggably matched with the cable plug (4); the upper joint (1) is provided with an upper torsion receiving portion (11), and the lower joint (2) is provided with a lower torsion receiving portion (21) snap-connected with the upper torsion receiving portion (11) to prevent the cable plug (4) from rotating relative to the cable socket (5) when the spiral sleeve (3) is rotated.

2. The cable laying rod and pipe connection device according to claim 1, characterized in that: The outer circumference of one of the upper joint (1) and the lower joint (2) is provided with at least one connecting key, and the inner circumference of the other is provided with a key groove which is engaged with the connecting key.

3. The cable laying rod and pipe connection device according to claim 2, characterized in that: The connection keys are evenly distributed along the circumferential direction of the upper joint (1) or along the circumferential direction of the lower joint (2).

4. The cable laying rod and pipe connection device according to claim 1, characterized in that: The cable plugs (4) are evenly distributed along the circumferential direction of the upper connector (1) or along the circumferential direction of the lower connector (2).

5. The cable laying rod-tube connection device according to any one of claims 1 to 4, characterized in that: The outer periphery of the upper joint (1) is provided with a positioning step (12) and the upper torsion portion (11) from top to bottom, and the inner periphery of the lower joint (2) is provided with an inner positioning step surface (22) for abutting against the bottom surface of the upper torsion portion (11).

6. The cable laying rod and pipe connection device according to claim 5, characterized in that: The cable plug (4) is arranged on the bottom surface of the positioning step (12), and the bottom of the cable plug (4) is higher than the connection end surface of the bottom of the upper connector (1).

7. The cable laying rod and pipe connection device according to claim 6, characterized in that: At least one sealing member is provided between the top surface of the positioning step (12) and the spiral sleeve (3), and at least one sealing member is provided between the outer peripheral surface of the positioning step (12) and the inner peripheral surface of the spiral sleeve (3).

8. The cable laying rod-tube connection device according to any one of claims 1 to 4, characterized in that: The cable (6) is laid in the through hole of the upper connector (1) or the through hole of the lower connector (2) through an insulating layer (7).

9. The cable laying rod-tube connection device according to any one of claims 1 to 4, characterized in that: The cable (6) is spirally wound inside the upper connector (1) and the lower connector (2).

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