Cable drill rod and well drilling device

Abstract

The utility model discloses a through cable drill rod, which relates to the technical field of directional horizontal well drilling track measurement, and mainly comprises a drill rod main body and a connecting piece, the connecting piece is arranged in the drill rod main body, a cable is connected with the connecting piece, and the connecting piece can drive the cable and the drill rod main body to form circumferential rotation connection. And the drill rod main body can drive the cable to move along the axis of the drill hole. The utility model further discloses a well drilling device which comprises the through cable drill rod. According to the utility model, the drilling efficiency of directional drilling can be improved, and the service life is long.

Description

Technical Field

[0001] This utility model relates to the field of directional horizontal well drilling trajectory measurement technology, and in particular to cable-guided drill pipes and drilling devices. Background Technology

[0002] During directional drilling, surface control personnel need to monitor various downhole conditions in real time, such as drill bit position, wellbore trajectory, formation characteristics, wellbore pressure, and temperature. They also need to send control commands to downhole equipment, such as adjusting the drill bit's drilling direction and rotation speed. Cables enable two-way communication between the surface and downhole equipment, allowing for rapid and accurate information transmission. Currently, the cable in through-drill pipes is typically installed directly or within the drill pipe using a support structure. For example, patent publication number CN208380511U, entitled "An Improved Irregular-Shaped Through-Drill Pipe," utilizes a support ring fixed inside the drill pipe, through which the cable passes and is fixedly connected. However, this method is unsuitable for composite drilling, specifically combined drilling involving drill bit rotation and vibration. This is because when the drill pipe rotates, the cable inside the drill pipe rotates as well. Prolonged rotation can cause the cable to loosen or become entangled, rubbing against the inner wall of the drill pipe and leading to damage. This method is only suitable for vibration drilling, resulting in slower drilling speeds and lower efficiency. Therefore, there is an urgent need for a cable-operated drill pipe and drilling device to solve the above-mentioned technical problems. Utility Model Content

[0003] The purpose of this invention is to provide a cable-operated drill pipe and drilling device to solve the problems existing in the prior art, which helps to improve the drilling efficiency of directional drilling and has a long service life.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] This utility model provides a cable-connected drill rod, including a drill rod body and a connector. The connector is disposed inside the drill rod body, and a cable is connected to the connector. The connector can drive the cable to form a circumferential rotational connection with the drill rod body, and the drill rod body can drive the cable to move along the direction of the borehole axis.

[0006] In some embodiments, the connector is a bearing, and the cable is circumferentially connected to the drill rod body through the bearing. The bearing is disposed in the inner cavity of the drill rod body, and the outer ring of the bearing is connected to the drill rod body, while the inner ring of the bearing is connected to the cable.

[0007] In some embodiments, two bearings are provided, namely a first bearing and a second bearing. The first bearing is provided at the female thread end of the drill pipe body, and the second bearing is provided at the male thread end of the drill pipe body.

[0008] In some embodiments, an elastic element is also included. The male thread end of the drill pipe body is provided with a sliding part and an abutting part. The sliding part is perpendicular to and fixedly connected to the abutting part. The abutting part is located at the end of the drill pipe body away from the male thread end and extends into the inner cavity of the drill pipe body. The second bearing is slidably disposed in the enclosed space of the sliding part and can abut against the abutting part. The elastic element is disposed along the length direction of the inner cavity of the drill pipe body, and the two ends of the elastic element abut against the second bearing and the male thread end of the drill pipe body, respectively.

[0009] In some embodiments, the elastic element is a spring, and the spring is always in a compressed state.

[0010] In some embodiments, a retaining ring and a retaining ring groove are also included. The male end of the drill pipe body has the retaining ring groove, the retaining ring is placed in the retaining ring groove, and the end of the spring away from the abutting part abuts against the retaining ring.

[0011] In some embodiments, both the first bearing and the second bearing are provided with fluid passage holes for the flow of drilling fluid.

[0012] In some embodiments, a positioning bolt is also included, wherein the female end of the drill rod body has a threaded hole, and a positioning hole is provided on the outer wall of the outer ring of the first bearing, wherein the positioning bolt can pass through the threaded hole and extend into the positioning hole to fix the first bearing to the drill rod body.

[0013] In some embodiments, the cable is a waterproof cable, and both ends of the waterproof cable are provided with wet plug connectors, and the wet plug connectors are provided with connector protective sleeves.

[0014] This utility model also provides a drilling device, including the cable-driven drill pipe as described above.

[0015] The present invention achieves the following technical advantages over the prior art:

[0016] The cable-operated drill rod provided by this utility model has a connector that enables the cable to rotate circumferentially with the drill rod body. The drill rod body also allows the cable to move along the borehole axis, meaning the cable can enter the borehole along with the drill rod during drilling. For composite drilling, even if the drill rod and drill bit rotate continuously, the cable can rotate circumferentially relative to the drill rod body. This means the drill rod body rotates, but the cable does not. The relatively fixed cable reduces the probability of friction with the drill rod body, which is beneficial for long-term use. Furthermore, this design allows for composite drilling, improving the drilling efficiency of directional drilling. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the cable-connecting drill rod in some embodiments of this utility model;

[0019] Figure 2 This is a side view of the first bearing in some embodiments of the present invention;

[0020] Figure 3 This is a side view of the second bearing in some embodiments of the present invention.

[0021] In the diagram: 1-Drill rod body; 2-Cable; 3-First bearing; 4-Second bearing; 5-Positioning bolt; 6-Spring; 7-Snap ring; 8-Fluid passage hole; 9-Positioning hole; 10-Sliding part; 11-Abutting part. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] The purpose of this invention is to provide a cable-operated drill pipe and drilling device to solve the problems existing in the prior art, which helps to improve the drilling efficiency of directional drilling and has a long service life.

[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] like Figures 1-3 As shown, this utility model provides a through-cable drill rod, including a drill rod body 1 and a connector. The connector is disposed inside the drill rod body 1, and the cable 2 is connected to the connector. The connector can drive the cable 2 to form a circumferential rotational connection with the drill rod body 1, and the drill rod body 1 can drive the cable 2 to move along the drilling axis, that is, when drilling, the cable can follow the drill rod into the borehole. For composite drilling, even if the drill rod and drill bit are constantly rotating, the cable 2 can rotate circumferentially relative to the drill rod body 1, that is, the drill rod body 1 rotates, but the cable 2 does not rotate. The cable 2 remains relatively stationary, reducing the probability of friction with the drill rod body 1. This can effectively avoid problems such as damage to the outer sheath and internal circuitry of the cable 2 caused by friction, thereby extending the service life of the cable 2 and the entire through-cable drill rod, reducing equipment replacement and maintenance costs, and facilitating long-term use. Furthermore, the fact that the drill rod body 1 rotates while the cable 2 does not is compatible with composite drilling processes. During directional drilling, composite drilling can combine the advantages of rotary drilling and sliding drilling, allowing for more flexible control of the wellbore trajectory. This enables the drill bit to drill more accurately in the predetermined direction, improving the efficiency and precision of directional drilling, helping to reduce drilling time, and increasing the overall efficiency of drilling operations.

[0027] In some embodiments, the connector is a bearing, which is disposed in the inner cavity of the drill pipe body 1. The outer ring of the bearing is connected to the drill pipe body 1, and the inner ring of the bearing is connected to the cable 2. Two bearings are provided: a first bearing 3 and a second bearing 4. The first bearing 3 is disposed at the female thread end of the drill pipe body 1, and its outer ring is fixedly connected to the inner cavity of the drill pipe body 1. The second bearing 4 is disposed at the male thread end of the drill pipe body 1. The first bearing 3 and the second bearing 4, respectively disposed at the female and male thread ends of the drill pipe body 1, can support and position the cable 2 from both ends, effectively preventing axial movement and radial displacement of the cable 2 within the drill pipe cavity. During drill pipe rotation, the cable 2 can always maintain an accurate position, ensuring the stability of the relative movement between the cable 2 and the drill pipe body 1. This is beneficial for improving the stability and reliability of power and signal transmission, ensuring accurate and timely transmission of downhole data to the surface.

[0028] As a feasible embodiment, the connector can also be a common ring-shaped component with a low coefficient of friction. The ring-shaped component is disposed inside the drill pipe body 1, with its outer circumference fitting against the inner circumferential surface of the drill pipe body 1. However, the ring-shaped component can rotate relative to the drill pipe body 1. The inner circumference of the ring-shaped component is used for cable connection. The ring-shaped component can be a bearing steel ring or a polytetrafluoroethylene ring, etc. However, in this case, a limiting component is needed to restrict the movement of the ring-shaped component. For example, an abutment rod is provided, abutting against both sides of the ring-shaped component to prevent the ring-shaped component from sliding along the axial direction of the drill pipe body 1 inside the drill pipe body 1.

[0029] In some embodiments, the drill pipe further includes an elastic element. The male end of the drill pipe body 1 is provided with a sliding portion 10 and an abutment portion 11. The sliding portion 10 and the abutment portion 11 are perpendicular to and fixedly connected. The abutment portion 11 is located at the end of the drill pipe body 1 away from the male end and extends into the inner cavity of the drill pipe body 1. The second bearing 4 is slidably disposed in the enclosing space of the sliding portion 10, and can slide along the axial direction of the enclosing space and abut against the abutment portion 11. The elastic element is disposed along the length direction of the inner cavity of the drill pipe body 1, and its two ends abut against the second bearing 4 and the male end of the drill pipe body 1, respectively. On the one hand, the drill pipe will be subjected to various impacts and vibrations during drilling, and the elastic element can effectively absorb and buffer these external forces. On the other hand, as a preferred embodiment, the cable 2 passes through the inner ring of the first bearing 3 and is appropriately interference-fitted with the inner ring of the first bearing 3. The inner ring of the second bearing 4 is fixedly connected to the cable 2. When the elastic element is in its initial state, the second bearing 4 is in contact with the abutment portion 11, at which time the cable 2 is completely within the inner cavity of the drill pipe body 1. When cable 2 needs to be connected to other devices, a tool can be used to pull the elastic element towards the male end, causing the cable to move axially along the drill pipe body 1. This further compresses the elastic element, and at this time, the second bearing 4 moves away from the contact part 11. Cable 2 moves together with the second bearing 4, and cable 2 moves axially within the inner ring of the first bearing 3. Cable 2 can also extend its male end to connect with the device to be connected. When cable 2 is not connected to the device, due to the rebound force of the elastic element, the elastic element pushes the second bearing 4 towards the end closer to the contact part 11 until the second bearing 4 contacts the contact part 11, returning to the initial state. At this time, cable 2 is completely located inside the drill pipe body 1. This arrangement allows cable 2 to retract completely into the inner cavity of the drill pipe body 1 when not in use, thus protecting cable 2 to a certain extent.

[0030] It should be noted that the outer ring of the second bearing 4 can be circular, but it is preferably polygonal, and more preferably hexagonal. When it is set to hexagonal, the inner cavity of the drill rod body 1 is also hexagonal. When the second bearing 4 is in the inner cavity of the drill rod body 1, it can only slide along the axial direction of the drill rod body 1, but the outer ring of the second bearing 4 does not rotate relative to the drill rod body, which can avoid wear of the outer ring of the second bearing 4 to a certain extent.

[0031] In some embodiments, the elastic element is a spring 6, and the spring 6 is always in a compressed state. In the initial state, the compression of the spring 6 is minimal, but it is still in a compressed state and can provide a preload force for the second bearing 4 to abut against the contact portion 11. When the cable 2 extends out of the male end, the compression of the spring 6 is at its maximum.

[0032] It should be noted that the elastic element can also be other types of devices, such as polyurethane elastomer devices, synthetic rubber devices, etc.

[0033] In some embodiments, the through-drill rod further includes a retaining ring 7 and a retaining ring groove. A retaining ring groove is formed at the male end of the drill rod body 1, away from the second bearing 4. A spring 6 is disposed between the second bearing 4 and the retaining ring groove, and the retaining ring 7 is placed within the retaining ring groove. The end of the spring 6 away from the second bearing 4 abuts against the retaining ring 7. The cooperation between the retaining ring 7 and the retaining ring groove provides precise positioning for the spring 6 and related components (such as the second bearing 4). Ensuring the spring 6 is in the accurate position at the male end of the drill rod body 1 guarantees that each component functions in its designed position, which improves the overall assembly accuracy and performance of the through-drill rod. The retaining ring 7, installed in the retaining ring groove, limits the displacement of the spring 6 in the axial direction of the drill rod. This prevents excessive axial movement of the spring 6 due to vibration, impact, or other external forces during drill rod operation, thus ensuring that the spring 6 always provides stable elastic force at the predetermined position, maintaining the normal operation of the entire system.

[0034] In some embodiments, both the first bearing 3 and the second bearing 4 are provided with fluid passage holes 8 for the flow of drilling fluid. Although drilling fluid can flow through the gaps between the bearing balls even without the fluid passage holes 8, providing the fluid passage holes 8 has the following advantages: since the drilling fluid may carry impurities, these impurities cannot pass through the gaps between the bearing balls and will accumulate. With the fluid passage holes 8, impurities can flow through the fluid passage holes 8, which can prevent the accumulation of impurities to a certain extent. Specifically, the fluid passage holes 8 can be provided on the outer rings of the first bearing 3 and the second bearing 4, and are through holes opened along the axial direction of the outer rings as fluid passage holes 8.

[0035] In some embodiments, the cable-connecting drill rod further includes a positioning bolt 5. The female threaded end of the drill rod body 1 has a threaded hole, and the outer wall of the outer ring of the first bearing 3 is provided with a positioning hole 9. The positioning bolt 5 can pass through the threaded hole and extend into the positioning hole 9 to fix the first bearing 3 to the drill rod body 1. The positioning bolt 5 cooperates with the threaded hole at the female threaded end of the drill rod body 1 and the positioning hole 9 on the outer wall of the outer ring of the first bearing 3 to ensure that the first bearing 3 is in a precise position during installation, thus guaranteeing the relative positional accuracy between the first bearing 3 and the drill rod body 1.

[0036] In some embodiments, cable 2 is a waterproof cable, and both ends of the waterproof cable are provided with wet-plug connectors, each with a protective sleeve. The waterproof cable itself has excellent waterproof performance, and the protective sleeves on the wet-plug connectors further enhance the waterproof effect. In the humid or even underwater environment of drilling operations, it effectively prevents moisture from entering the cable 2, avoiding electrical faults such as short circuits and leakage caused by moisture intrusion, ensuring the stable electrical performance of cable 2, and extending the service life of cable 2. It should be noted that a wet-plug connector is an electrical connector that allows for safe and convenient plugging and unplugging connections under harsh environmental conditions such as being energized and humid or underwater, without prior power disconnection or drying. It generally uses high-performance sealing materials such as rubber and silicone, and through special processes, forms sealing rings, gaskets, and other components, effectively preventing water and other liquids from entering the connector, ensuring that the electrical connection is isolated from the external humid environment.

[0037] Example 2

[0038] This embodiment also provides a drilling device, including the cable-driven drill pipe in Embodiment 1, which helps to improve the drilling efficiency of directional drilling and has a long service life.

[0039] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A through-cable drill pipe, characterized by: The drill rod body and the connecting piece are arranged inside the drill rod body, the cable is connected with the connecting piece, the connecting piece can drive the cable to form a circumferential rotation connection with the drill rod body, and the drill rod body can drive the cable to move along the direction of the drilling hole axis.

2. The through-cable drill pipe of claim 1, wherein: The connecting piece is a bearing, the cable and the drill rod body are connected in circumferential rotation through the bearing, the bearing is arranged in the inner cavity of the drill rod body, the outer ring of the bearing is connected with the drill rod body, and the inner ring of the bearing is connected with the cable.

3. The through-cable drill pipe of claim 2, wherein: The bearing is provided with two first bearings and second bearings, the first bearing is arranged at the box end of the drill rod body, and the second bearing is arranged at the pin end of the drill rod body.

4. The through-cable drill pipe of claim 3, wherein: The pin end of the drill rod body is provided with a sliding part and a contact part, the sliding part is vertically and fixedly connected with the contact part, the contact part is arranged at one end of the drill rod body away from the pin end and extends to the inner cavity of the drill rod body, the second bearing is slidingly arranged in the enclosed space of the sliding part and can be in contact with the contact part, the elastic member is arranged along the length direction of the inner cavity of the drill rod body, and the two ends of the elastic member are in contact with the second bearing and the pin end of the drill rod body, respectively.

5. The through-cable drill pipe of claim 4, wherein: The elastic member is a spring, and the spring can always be in a compressed state.

6. The through-cable drill pipe of claim 5, wherein: The drill rod body is provided with a snap spring groove at the pin end, the snap spring is arranged in the snap spring groove, and one end of the spring away from the contact part is in contact with the snap spring.

7. The service cable drill pipe of claim 3, wherein: The first bearing and the second bearing are both provided with a liquid passage hole for the flow of drilling fluid.

8. The through-cable drill pipe of claim 3, wherein: The drill rod body is provided with a threaded hole at the box end, the outer wall of the outer ring of the first bearing is provided with a positioning hole, and the positioning bolt can pass through the threaded hole and extend into the positioning hole to fix the first bearing and the drill rod body.

9. The service cable drill pipe of claim 1, wherein: The cable is a waterproof cable, and both ends of the waterproof cable are provided with a wet plug connector, and the wet plug connector is provided with a connector protection sleeve.

10. A drilling apparatus, characterized by: The cable drill rod comprises the cable drill rod according to any one of claims 1-9. The cable drill rod comprises the cable drill rod according to any one of claims 1-9.

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