Photoelectric composite cable switching device capable of reducing optical loss

Abstract

The invention provides a photoelectric composite cable switching device capable of reducing optical loss, and belongs to the field of optical cable signal transmission for intelligent well drilling of oil and gas fields, the photoelectric composite cable switching device comprises a roller and a photoelectric composite cable wound on the roller, the outer side end of the photoelectric composite cable is connected with an underground tool string, and when the roller rotates, the photoelectric composite cable is connected with the underground tool string. The photoelectric composite cable is tightly wound or loosened on the winding reel and drives the underground tool string to ascend or descend; wherein an optical cable and an electric cable are separated from the inner side end of the photoelectric composite cable and enter the roller; in the roller, the optical cable is coiled, and the cable is provided with a rotary electric connecting piece; when the roller rotates, the optical cable is wound in or out along with the roller, and the cable rotates through the rotating electric connecting piece. According to the invention, the use of a smooth ring is reduced, the continuity of the optical cable is realized, the loss of optical signals is reduced, the transmission effectiveness of the optical signals is improved, and the transmission failure risk of the optical signals is reduced.

Description

Technical Field

[0001] The invention relates to a photoelectric composite cable switching device for reducing optical loss, and belongs to the field of optical cable signal transmission for intelligent drilling in oil and gas fields. Background Art

[0002] Automated, intelligent drilling and completion are an inevitable trend in the oil and gas industry, and a transformative technology for achieving safe and efficient drilling in complex oil and gas operations. Intelligent, automated control requires data support. As real-time, high-speed, and efficient data transmission media, fiber optic transmission systems and electrical transmission have become core technologies for intelligent drilling, leading to the emergence of optoelectronic composite cables. Electrical transmission serves as the driving force for downhole components, while optical signals are used to transmit signals collected by various downhole sensors, achieving high-speed and efficient transmission.

[0003] During the drilling process, the optical cable above the wellhead must be lifted and wound using a winch drum. This process prevents the section of cable connected to the ground control equipment from rotating. Typically, a slip ring is incorporated into the cable to prevent the cable from rotating while the drum is winding the cable. Optical signals have high transmission rates, but they suffer significant signal loss at the cable joints or slip rings, which can easily lead to distortion. This makes accurate signal conversion and reading impossible on the surface. Therefore, the number of cable joints and slip rings along the entire transmission line should be minimized. Summary of the Invention

[0004] In response to the above-mentioned technical problems existing in the prior art, the present invention proposes an optoelectronic composite cable switching device that reduces optical loss. When the internal optical cable length does not change, the adaptive characteristics of the elastic reel diameter are used to reduce the use of a smooth ring, thereby achieving the continuity of the optical cable, reducing the loss of the optical signal, improving the effectiveness of the optical signal transmission, and reducing the risk of optical signal transmission failure.

[0005] The present invention proposes an optoelectronic composite cable switching device for reducing optical loss, comprising:

[0006] roller,

[0007] The photoelectric composite cable is wound on the drum, and the outer end of the photoelectric composite cable is connected to the downhole tool string. When the drum rotates, the photoelectric composite cable is tightened or loosened on the winding drum and drives the downhole tool string to be lifted or lowered;

[0008] The inner end of the optical-electrical composite cable separates the optical cable and the electrical cable and enters the interior of the drum; inside the drum, the optical cable is coiled and the electrical cable is provided with a rotating electrical connector;

[0009] When the drum rotates, the optical cable is wound in or out, and the cable is rotated by rotating the electrical connector.

[0010] A further improvement of the present invention is that the drum comprises:

[0011] a rotatable drum rotating end, the drum rotating end being connected to a bobbin, the bobbin being provided with a first hole; and

[0012] A fixed drum outlet end, wherein a fixed cylinder is provided on the drum outlet end, and a second hole communicating with the fixed cylinder is further provided in the middle of the drum outlet end;

[0013] The optoelectronic composite cable is wound on the winding drum, and the optical cable and the electrical cable enter the drum through the first hole and are led out through the second hole.

[0014] A further improvement of the present invention is that the diameter of the winding drum is larger than the diameter of the fixed drum, and the winding drum is sleeved on the outside of the fixed drum; the wire outlet end of the drum remains fixed to the fixed drum, and the rotating end of the drum and the winding drum can rotate along the axis.

[0015] A further improvement of the present invention is that the first hole is provided on a side of the bobbin close to the rotating end of the drum;

[0016] The length of the winding barrel is greater than that of the fixing barrel, and an end portion of the fixing barrel is located at one side of the first hole.

[0017] A further improvement of the present invention is that the optical cable is wound on the fixed drum inside the drum. When the rotating end of the drum and the winding drum rotate, the inner end of the optoelectronic composite cable is driven to rotate, and at the same time, the optical cable is driven to be wound in or out of the fixed drum.

[0018] A further improvement of the present invention is that the rotating electrical connector is arranged inside the fixed cylinder, the cable enters the interior of the winding drum through the first hole, and penetrates into the interior of the fixed cylinder to connect to the rotating electrical connector, and the cable on the other side of the rotating electrical connector is led out through the second hole.

[0019] A further improvement of the present invention is that the rotating electrical connector is an electric slip ring.

[0020] A further improvement of the present invention is that a third hole is provided on the fixing hole, the optical cable is arranged on the fixing cylinder and enters the fixing cylinder through the third hole;

[0021] The electrical cables and optical cables in the fixing barrel are led out through the second hole.

[0022] A further improvement of the present invention is that an elastic reel is provided on the fixing cylinder, and the optical cable is wound on the elastic reel.

[0023] A further improvement of the present invention is that the optoelectronic composite cable comprises an outer sheath, and the optical cable and the electrical cable are arranged inside the outer sheath.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] According to the optoelectronic composite cable switching device for reducing optical loss described in the present invention, when the internal optical cable length does not change, the adaptive characteristics of the elastic reel diameter are used to reduce the use of a smooth ring, thereby achieving the continuity of the optical cable, reducing the loss of the optical signal, improving the effectiveness of the optical signal transmission, and reducing the risk of optical signal transmission failure.

[0026] According to the optoelectronic composite cable switching device for reducing optical loss described in the present invention, the cable uses a rotating electrical connector to achieve rotation. The loss of the rotating electrical connector is much smaller than the loss of the rotating optical connector. The lead-out does not require the cable to be wound to avoid forming a coil, which causes electromagnetic interference or loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0028] Figure 1 FIG2 is a schematic structural diagram of an optoelectronic composite cable switching device according to an embodiment of the present invention, showing the external structure;

[0029] Figure 2 FIG2 is a schematic structural diagram of an optoelectronic composite cable switching device according to an embodiment of the present invention, showing a cross-sectional structure;

[0030] Figure 3 The figure shows a schematic cross-sectional structure diagram of the rotating end of a drum according to an embodiment of the present invention;

[0031] Figure 4 FIG2 is a schematic diagram of an axial cross-sectional structure of a drum according to an embodiment of the present invention;

[0032] The drawings are not drawn to scale.

[0033] The meanings of the reference numerals in the accompanying drawings are as follows:

[0034] 1. Rotating end of drum, 2. Wire outlet end of drum, 3. Optical-electric composite cable,

[0035] 11. Winding drum, 12. First hole, 21. Fixed drum, 22. Second hole, 23. Third hole, 24. Elastic reel, 31. Optical cable, 32. Electrical cable, 33. Rotating electrical connector. DETAILED DESCRIPTION

[0036] To make the technical solutions and advantages of the present invention more clearly understood, exemplary embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, and are not exhaustive. Furthermore, the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict.

[0037] Automated, intelligent drilling and completion are an inevitable trend in the oil and gas industry, and a transformative technology for achieving safe and efficient drilling in complex oil and gas operations. Intelligent, automated control requires data support. As real-time, high-speed, and efficient data transmission media, fiber optic transmission systems and electrical transmission have become core technologies for intelligent drilling, leading to the emergence of optoelectronic composite cables. Electrical transmission serves as the driving force for downhole components, while optical signals are used to transmit signals collected by various downhole sensors, achieving high-speed and efficient transmission.

[0038] During the drilling process, the optical cable above the wellhead must be lifted and wound using a winch drum. This process prevents the section of cable connected to the ground control equipment from rotating. Typically, a slip ring is incorporated into the cable to prevent the cable from rotating while the drum is winding the cable. Optical signals have high transmission rates, but they suffer significant signal loss at the cable joints or slip rings, which can easily lead to distortion. This makes accurate signal conversion and reading impossible on the surface. Therefore, the number of cable joints and slip rings along the entire transmission line should be minimized.

[0039] To solve the above problems, the present invention proposes an optoelectronic composite cable switching device that reduces optical loss. When the internal optical cable length does not change, the adaptive characteristics of the elastic reel diameter are used to reduce the use of a smooth ring, thereby achieving the continuity of the optical cable, reducing the loss of the optical signal, improving the effectiveness of the optical signal transmission, and reducing the risk of optical signal transmission failure.

[0040] In such Figure 1 In the embodiment shown, a photoelectric composite cable switching device for reducing optical loss includes:

[0041] The drum is a nearly cylindrical structure and can rotate along an axis.

[0042] An optical fiber composite cable 3 is mounted on the drum. The outer end of the optical fiber composite cable 3 is connected to the downhole tool string. This cable transmits optical and electrical signals while also driving the downhole tool string. As the drum rotates, the optical fiber composite cable 3 is wound or released around the reel 11, driving the downhole tool string to be raised or lowered.

[0043] The inner end of the optical-electrical composite cable 3 separates an optical cable 31 and an electrical cable 32 and enters the drum. Inside the drum, the optical cable 31 is coiled and the electrical cable 32 is provided with a rotating electrical connector 33 .

[0044] Since the optical cable 31 is coiled, when the drum rotates, the optical cable 31 is wound in or out as the drum rolls; the electrical cable 32 rotates through the electrical connector.

[0045] In the optoelectronic composite cable switching device for reducing optical loss according to this embodiment, the inner end of the optoelectronic composite cable 3 is a fixed end, and the outer end is a lead-out end. When the drum rotates, the inner end rotates accordingly, and the outer end is wound into or out of the drum.

[0046] In this embodiment, the optical fiber composite cable 3 includes an outer sheath, within which are disposed an optical cable 31 and an electrical cable 32 for transmitting optical signals and electrical energy. At the inner end of the optical fiber composite cable 3, the outer sheath reaches the end and is split open, allowing the optical cable 31 and the electrical cable 32 to be led out and into the drum.

[0047] The optical cable 31 is coiled inside the drum. When the drum rotates, the optical cable 31 is wound in or out accordingly. This avoids the use of a smooth ring at this position, achieves the continuity of the optical cable 31, reduces the loss of the optical signal, improves the effectiveness of the transmission of the optical signal, and reduces the risk of optical signal transmission failure.

[0048] The cable 32 uses a rotating electrical connector 33 to achieve rotation. The loss of the rotating electrical connector 33 is much smaller than the loss of the rotating optical connector. The lead-out does not require the cable 32 to be wound to avoid forming a coil and causing electromagnetic interference or loss.

[0049] In one embodiment, the drum includes a drum rotating end 1, which is a circular structure. A winding drum 11 is provided on one surface of the drum rotating end 1. The winding drum 11 is a cylindrical structure, and the center axis of the winding drum 11 is vertically arranged on the circular surface of the drum rotating end 1.

[0050] The other side of the drum rotating end 1 is connected to a rotation driving device, such as a motor. When the rotation driving device rotates, it can drive the drum rotating end 1 and the winding drum 11 to rotate.

[0051] A first hole 12 is provided on the bobbin 11 . The first hole 12 is opened in the radial direction and is provided on a side close to the rotating end 1 of the drum.

[0052] The roller of the optoelectronic composite cable switching device for reducing optical loss described in this embodiment also includes a roller outlet end 2, on which a fixed cylinder 21 is provided, and a second hole 22 is also provided in the middle of the roller outlet end 2. The second hole 22 is arranged axially and connects the outside and the inside of the fixed cylinder 21.

[0053] The optical-electrical composite cable 3 is wound on the winding drum 11 , and the optical cable 31 and the electrical cable 32 enter the drum through the first hole 12 and are led out through the second hole 22 .

[0054] In one embodiment, the diameter of the winding drum 11 is larger than the diameter of the fixed drum 21, and the winding drum 11 is sleeved on the outside of the fixed drum 21; the drum outlet end 2 and the fixed drum 21 remain fixed, and the drum rotating end 1 and the winding drum 11 can rotate along the axis.

[0055] In a preferred embodiment, the first hole 12 is provided on the side of the bobbin 11 close to the rotating end 1 of the drum;

[0056] The length of the winding drum 11 is greater than that of the fixing drum 21 , and the end of the fixing drum 21 is located on one side of the first hole 12 , and the distance between the two is close.

[0057] In this embodiment, the end of the winding drum 11 is rotatably connected to the drum outlet end 2, and there is a certain gap between the fixed drum 21 and the drum rotating end 1, and they are not connected.

[0058] The gap between the end of the fixed cylinder 21 and the rotating end 1 of the drum can accommodate the cable 32. After the cable 32 enters the interior of the drum from the first hole 12, it passes through the gap between the end of the fixed cylinder 21 and the rotating end 1 of the drum and enters the interior of the fixed cylinder 21.

[0059] In one embodiment, the optical cable 31 is wound around the fixed drum 21 in the drum. When the rotating end 1 of the drum and the winding drum 11 rotate, the inner end of the optoelectronic composite cable 3 is driven to rotate, and at the same time, the optical cable 31 is driven to be wound into or out of the fixed drum 21.

[0060] Inside the drum, the optical cable 31 is coiled on the fixed drum 21. When the drum rotates, the optical cable 31 is wound around the fixed drum 21 or unwound from the fixed drum 21. This allows the optical cable 31 to rotate with the drum and avoid twisting. By coiling the optical cable 31 on the fixed drum 21, the use of a smooth ring can be avoided, thereby achieving the continuity of the optical cable 31, reducing the loss of the optical signal, improving the effectiveness of the transmission of the optical signal, and thereby reducing the risk of optical signal transmission failure.

[0061] In one embodiment, the rotating electrical connector 33 is arranged inside the fixed cylinder 21, the cable 32 enters the inside of the winding cylinder 11 through the first hole 12, and is connected to the rotating electrical connector 33 by entering the inside of the fixed cylinder 21, and the cable 32 on the other side of the rotating electrical connector 33 is led out through the second hole 22.

[0062] The cable 32 uses the rotating electrical connector 33 to realize rotation, and the loss of the rotating electrical connector 33 is much smaller than that of the rotating optical connector, and the cable 32 is also wound out without being led out, avoiding the formation of a coil and causing electromagnetic interference or loss.

[0063] In one preferred embodiment, the rotating electrical connector 33 is an electrical slip ring.

[0064] In one embodiment, a third hole 23 is arranged on the fixed hole, the optical cable 31 is arranged on the fixed cylinder 21, and enters the inside of the fixed cylinder 21 through the third hole 23.

[0065] The cable 32 and the optical cable 31 in the fixed cylinder 21 are led out through the second hole 22, thereby connecting an external control system.

[0066] In one embodiment, an elastic winding drum 24 is arranged on the fixed cylinder 21, and the optical cable 31 is wound on the elastic winding drum 24.

[0067] In the optical-electric composite cable adapter device for reducing optical loss according to the embodiment, the inside end of the elastic winding drum 24 is fixed on the fixed cylinder 21, the optical cable 31 entering from the first hole 12 of the winding cylinder 11 is wound on the elastic winding drum 24, and is wound to the other end of the elastic winding drum 24, then the optical cable 31 passes through the third hole 23 on the fixed cylinder 21, enters the inside of the fixed cylinder 21, and is led out from the second hole 22 of the drum outlet end 2, and finally is connected to a control system.

[0068] The overall length of the optical cable 31 from the cutting position of the optical-electric composite cable 3 to the drum outlet end 2 is fixed. The elastic winding drum 24 has a certain elasticity, and its diameter can change. The elastic winding drum 24 is fixed on the fixed cylinder 21 and cannot rotate, so it rotates together with the winding cylinder 11 and the optical cable 31, and thus the number of winding turns of the optical cable 31 wound on the elastic winding drum 24 changes.

[0069] In the embodiment, the diameter of the elastic winding drum 24 changes to adapt, the total length of the optical cable 31 wound is fixed, the number of turns increases, the diameter of the elastic winding drum 24 decreases under the tension of the optical cable 31, the number of turns decreases, the tension of the optical cable 31 decreases, the diameter of the elastic winding drum 24 increases, and the optical cable 31 is always in a stretched state to avoid being too loose and winding on each other to break the optical cable 31.

[0070] Embodiment 1

[0071] A photoelectric composite cable switching device with reduced light loss, comprising:

[0072] A drum, which is approximately cylindrical in structure, is capable of rotating along an axis.

[0073] A photoelectric composite cable 3 is arranged on the drum, with the outer end of the photoelectric composite cable 3 connected to a downhole tool string, capable of transmitting optical signals and electrical signals, and also capable of moving the downhole tool string. When the drum rotates, the photoelectric composite cable 3 is wound tightly or loosened on the winding drum 11, and the downhole tool string is lifted or lowered.

[0074] The inner end of the photoelectric composite cable 3 branches into an optical cable 31 and an electrical cable 32, and enters the interior of the drum. In the interior of the drum, the optical cable 31 is arranged in a coiled manner, and the electrical cable 32 is provided with a rotating electrical connector 33.

[0075] Because the optical cable 31 is arranged in a coiled manner, when the drum rotates, the optical cable 31 is wound in or out with the rolling of the drum; the electrical cable 32 rotates through the electrical connector.

[0076] The drum includes a drum rotating end 1, which is circular in structure, and a winding drum 11 is arranged on one side of the drum rotating end 1, which is cylindrical in structure, with the central axis of the winding drum 11 arranged vertically on the circular surface of the drum rotating end 1.

[0077] The other side of the drum rotating end 1 is connected to a rotating drive device, such as a motor, which can rotate the drum rotating end 1 and the winding drum 11 when the rotating drive device rotates.

[0078] A first hole 12 is arranged on the winding drum 11, which is radially arranged and located on the side close to the drum rotating end 1.

[0079] The drum also includes a drum outlet end 2, which is provided with a fixed cylinder 21, and the middle part of the drum outlet end 2 is also provided with a second hole 22, which is arranged axially and communicates the outside with the inside of the fixed cylinder 21.

[0080] The photoelectric composite cable 3 is wound on the winding drum 11, and the optical cable 31 and the electrical cable 32 enter the drum through the first hole 12 and are led out through the second hole 22.

[0081] The diameter of the winding drum 11 is larger than that of the fixed drum 21, and the winding drum 11 is sleeved on the outside of the fixed drum 21; the drum outlet end 2 and the fixed drum 21 remain fixed, and the drum rotating end 1 and the winding drum 11 can rotate along the axis.

[0082] The first hole 12 is provided on the side of the winding drum 11 close to the rotating end 1 of the drum;

[0083] The length of the winding drum 11 is greater than that of the fixing drum 21 , and the end of the fixing drum 21 is located on one side of the first hole 12 , and the distance between the two is close.

[0084] The end of the winding drum 11 is rotatably connected to the drum outlet end 2, and there is a certain gap between the fixed drum 21 and the drum rotating end 1, and they are not connected.

[0085] The gap between the end of the fixed cylinder 21 and the rotating end 1 of the drum can accommodate the cable 32. After the cable 32 enters the interior of the drum from the first hole 12, it passes through the gap between the end of the fixed cylinder 21 and the rotating end 1 of the drum and enters the interior of the fixed cylinder 21.

[0086] The optical cable 31 is wound around the fixed drum 21 in the drum. When the drum rotating end 1 and the winding drum 11 rotate, the inner end of the optoelectronic composite cable 3 is driven to rotate, and at the same time, the optical cable 31 is driven to be wound into or out of the fixed drum 21.

[0087] Inside the drum, the optical cable 31 is coiled on the fixed drum 21. When the drum rotates, the optical cable 31 is wound around the fixed drum 21 or unwound from the fixed drum 21. This allows the optical cable 31 to rotate with the drum and avoid twisting. By coiling the optical cable 31 on the fixed drum 21, the use of a smooth ring can be avoided, thereby achieving the continuity of the optical cable 31, reducing the loss of the optical signal, improving the effectiveness of the transmission of the optical signal, and thereby reducing the risk of optical signal transmission failure.

[0088] The rotating electrical connector 33 is arranged inside the fixed cylinder 21, and the cable 32 enters the interior of the winding drum 11 through the first hole 12, and penetrates into the interior of the fixed cylinder 21 to connect with the rotating electrical connector 33. The cable 32 on the other side of the rotating electrical connector 33 is led out through the second hole 22.

[0089] The cable 32 uses a rotating electrical connector 33 to achieve rotation. The loss of the rotating electrical connector 33 is much smaller than the loss of the rotating optical connector. The lead-out does not require the cable 32 to be wound to avoid forming a coil and causing electromagnetic interference or loss.

[0090] The rotating electrical connector 33 is an electric slip ring.

[0091] The fixing hole is provided with a third hole 23, and the optical cable 31 is arranged on the fixing tube 21 and enters the fixing tube 21 through the third hole 23;

[0092] The electrical cable 32 and the optical cable 31 in the fixing tube 21 are led out through the second hole 22 to be connected to an external control system.

[0093] An elastic reel 24 is provided on the fixing cylinder 21 , and the optical cable 31 is wound around the elastic reel 24 .

[0094] The inner end of the elastic reel 24 is fixed on the fixed drum 21, and the optical cable 31 entering from the first hole 12 of the winding drum 11 is wound around the elastic reel 24 and wound all the way to the other end of the elastic reel 24. Then the optical cable 31 passes through the third hole 23 on the fixed drum 21, enters the interior of the fixed drum 21, and then passes through the second hole 22 of the drum outlet end 2, and is finally connected to the control system.

[0095] The optical cable 31 has a fixed length from the cutout point of the optical / electrical composite cable 3 to the outlet end 2 of the drum. The elastic drum 24 has a certain degree of elasticity, and its diameter can be varied. The elastic drum 24 is fixed to the fixed drum 21 and cannot rotate. Therefore, the winding drum 11 rotates with the optical cable 31, causing the number of turns of the optical cable 31 wound around the elastic drum 24 to vary.

[0096] In this embodiment, a rotary drive motor is connected to the outer side of the drum's rotating end 1, which is welded to the bobbin 11. The optical fiber cable 3 is wound around the bobbin 11, which has an outer diameter of 200 mm. The optical fiber cables 31 are tightly arranged. The upper end of the optical fiber cable 3 is cut into a 3-meter section, leaving a 3-meter length of optical fiber cable 31 and a 0.5-meter section of electrical cable 32. The cable 32 then passes through a hole in the bobbin 11 and into the internal space.

[0097] In the device, the fixed cylinder 21 and the drum outlet end 2 are connected as a whole by welding. The inner end of the elastic drum 24 is welded and fixed to the fixed cylinder 21. The 1.5m optical cable 31 is wound on the elastic drum 24. The optical cable 31 then passes through the hole on the fixed cylinder 21, enters the interior of the fixed cylinder 21, and then comes out from the drum outlet end 2. Finally, about 311m of optical cable is reserved and connected to the control system.

[0098] A mature electric slip ring is purchased and installed inside the fixed cylinder 21. The cable 32 coming in from the first hole 12 of the winding drum 11 is connected to one end of the electric slip ring. The other end of the electric slip ring is connected to the control system through another 1.5m long cable 32 to realize electrical transmission.

[0099] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should extend to equivalent substitutions of these features understood by those skilled in the relevant art. It should also be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting.

[0100] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0101] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0102] Certain terms are used throughout this specification to refer to specific system components. As those skilled in the art will appreciate, different names can often be used to refer to the same component, and thus this specification does not intend to distinguish between components that differ only in name, not function. References in this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout this specification do not necessarily refer to the same embodiment.

[0103] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

[0104] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made in accordance with the embodiments of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A photoelectric composite cable switching device for reducing optical loss, characterized in that: include: roller, A photoelectric composite cable (3) is wound on the drum, and the outer end of the photoelectric composite cable (3) is connected to a downhole tool string. When the drum rotates, the photoelectric composite cable (3) is wound tightly or loosened on the winding drum (11) and drives the downhole tool string to be lifted or lowered; The inner end of the photoelectric composite cable (3) is divided into an optical cable (31) and an electrical cable (32), and enters the interior of the drum; inside the drum, the optical cable (31) is coiled, and the electrical cable (32) is provided with a rotating electrical connector (33); When the drum rotates, the optical cable (31) is wound in or out, and the electrical cable (32) is rotated by rotating the electrical connector (33).

2. The optoelectronic composite cable switching device for reducing optical loss according to claim 1, characterized in that: The drum comprises: A rotatable drum rotating end (1), the drum rotating end (1) being connected to a bobbin (11), the bobbin (11) being provided with a first hole (12); and A fixed roller outlet end (2), wherein a fixed cylinder (21) is provided on the roller outlet end (2), and a second hole (22) communicating with the fixed cylinder (21) is further provided in the middle of the roller outlet end (2); The photoelectric composite cable (3) is wound on the winding drum (11); the optical cable (31) and the electrical cable (32) enter the drum through the first hole (12) and are led out through the second hole (22).

3. The optoelectronic composite cable switching device for reducing optical loss according to claim 2, characterized in that: The diameter of the winding drum (11) is greater than the diameter of the fixed drum (21), and the winding drum (11) is sleeved on the outside of the fixed drum (21); the drum outlet end (2) and the fixed drum (21) are kept fixed, and the drum rotating end (1) and the winding drum (11) can rotate along the axis.

4. The optoelectronic composite cable switching device for reducing optical loss according to claim 3, characterized in that: The first hole (12) is provided on a side of the bobbin (11) close to the rotating end (1) of the drum; The length of the winding drum (11) is greater than the length of the fixing drum (21), and the end of the fixing drum (21) is located on one side of the first hole (12).

5. The optoelectronic composite cable switching device for reducing optical loss according to claim 4, characterized in that: The optical cable (31) is wound around the fixed drum (21) in the drum. When the rotating end (1) of the drum and the winding drum (11) rotate, the inner end of the photoelectric composite cable (3) is driven to rotate, and at the same time, the optical cable (31) is driven to be wound into or out of the fixed drum (21).

6. The optoelectronic composite cable switching device for reducing optical loss according to claim 5, characterized in that: The rotating electrical connector (33) is arranged inside the fixed cylinder (21); the cable (32) enters the inside of the winding drum (11) through the first hole (12) and penetrates into the inside of the fixed cylinder (21) to connect with the rotating electrical connector (33); the cable (32) on the other side of the rotating electrical connector (33) is led out through the second hole (22).

7. The optoelectronic composite cable switching device for reducing optical loss according to claim 6, characterized in that: The rotating electrical connector (33) is an electric slip ring.

8. The optoelectronic composite cable switching device for reducing optical loss according to claim 7, characterized in that: A third hole (23) is provided on the fixing hole, and the optical cable (31) is arranged on the fixing cylinder (21) and enters the fixing cylinder (21) through the third hole (23); The electric cable (32) and the optical cable (31) in the fixing cylinder (21) are led out through the second hole (22).

9. The optoelectronic composite cable switching device for reducing optical loss according to claim 8, characterized in that: An elastic reel (24) is provided on the fixing cylinder (21), and the optical cable (31) is wound on the elastic reel (24).

10. The optoelectronic composite cable switching device for reducing optical loss according to claim 9, characterized in that: The optical-electrical composite cable (3) comprises an outer sheath, and the optical cable (31) and the electrical cable (32) are arranged inside the outer sheath.

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