Downhole cable automatic reel

Abstract

The application discloses a downhole cable automatic winding and unwinding device and relates to the field of downhole instrument signal measurement and transmission.The device comprises a wellhead nipple, a cable winding and unwinding nipple head section, a cable winding and unwinding nipple tail section and a measuring instrument nipple.The wellhead nipple is used for being connected with the cable.A cable channel is arranged in the cable winding and unwinding nipple head section.A cable winding and unwinding device is arranged in the cable winding and unwinding nipple tail section.A measuring instrument is arranged in the measuring instrument nipple.One end of the cable is used for being connected with the wellhead nipple by penetrating through the cable channel, the other end of the cable is connected with the measuring instrument, and the automatic winding and unwinding of the cable is realized through the cable winding and unwinding device.The whole process is in the drill pipe, the drill pipe is lowered into the well bottom while drilling, power is supplied to the downhole equipment at any time according to the process requirement, the signal of the downhole measuring instrument is transmitted, the transmission speed of the downhole measuring data is improved, the data transmission scale is increased, the coding difficulty is reduced, and the downhole information measuring efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of downhole cable arrangement, in particular to a downhole cable automatic winding and unwinding device. BACKGROUND

[0002] The statements in this section merely provide background information related to the present disclosure and can not constitute the prior art.

[0003] At present, with the popularization of the use of cable, the cable has been applied to various industries, and the oil industry is one of them; at the present stage, in oil drilling, the measurement signals of downhole measuring instruments such as LWD, MWD and PWD are generally transmitted through pressure pulse, the data transmission efficiency is low, the coding is complex, and the downhole information acquisition projects and data volume are limited. SUMMARY

[0004] The purpose of the present application is to solve the above problems by providing a downhole cable automatic winding and unwinding device, which sets the cable in the drill pipe and transmits the downhole data through the cable, thereby increasing the data transmission scale and improving the signal transmission rate.

[0005] The technical scheme of the present application is as follows:

[0006] A downhole cable automatic winding and unwinding device is arranged in the drill pipe, comprising:

[0007] a wellhead sub, a cable winding and unwinding sub first section, a cable winding and unwinding sub tail section, and a measuring instrument sub; the wellhead sub is used for connecting the cable; the cable winding and unwinding sub first section is provided with a cable channel; the cable winding and unwinding sub tail section is provided with a cable winding and unwinding device; the measuring instrument sub is provided with a measuring instrument; one end of the cable passes through the cable channel and is used for connecting the wellhead sub, and the other end is connected with the measuring instrument and realizes the automatic winding and unwinding of the cable through the cable winding and unwinding device.

[0008] Further, the wellhead sub is arranged at the wellhead part, comprising:

[0009] a wireless charging signal receiver for connecting the cable and a first protective sleeve for isolating the drilling fluid; the first protective sleeve is sleeved on the wireless charging signal receiver; one end of the cable is connected with the wireless charging signal receiver through magnetic attraction.

[0010] Further, one end of the cable for connecting the wireless charging signal receiver is provided with a cable auxiliary floating device for assisting the cable to float in the drilling fluid.

[0011] Further, the cable winding and unwinding device comprises:

[0012] A drum for cable winding and a driving device for driving the drum to rotate; the cable is wound on the drum, and the driving device is arranged below the drum.

[0013] Further, bearings are arranged at both ends of the drum to assist the rotation of the drum, and the bearings are fixed in the drill pipe through the isolation plates.

[0014] The upper end of the drum is provided with a cable clamp, which can lock the cable to prevent the cable from floating up.

[0015] Further, the driving device comprises a motor fixing disc, a reducer fixing disc, a first motor and a rotating disc; the reducer fixing disc is located above the motor fixing disc, the first motor is installed on the motor fixing disc, the output end of the first motor is connected with the rotating disc below through a reducer and a shaft coupling, and the upper end of the rotating disc is connected with the drum.

[0016] Further, the drum is hollow at both ends and serves as a drilling fluid flow passage.

[0017] A second protective sleeve is arranged on the inner wall of the drill pipe between the two isolation plates.

[0018] Further, the cable winding and unwinding device further comprises:

[0019] The gear and rack mechanism comprises a sliding rail, a movable sliding block installed on the sliding rail, a rack arranged on the sliding rail, a second motor installed on the sliding block, a gear connected with the rack on the second motor, and two pulleys installed on the sliding block, and the cable passes between the two pulleys.

[0020] Further, the cable is connected between the drum and the measuring instrument through a brush and a commutator.

[0021] Further, the cable winding and unwinding device further comprises:

[0022] The battery pack short section, the cable winding and unwinding short section, the battery pack short section and the measuring instrument short section are sequentially connected through threads.

[0023] The battery pack short section comprises a battery fixing disc, and batteries are installed on the battery fixing disc; the cable can charge the batteries.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] The application relates to a downhole cable automatic winding and unwinding device, which is entirely arranged in a drilling rod, can supply power to downhole equipment at any time, can monitor the drilling process, can reduce the stopping and starting of drilling, can greatly reduce time and manpower for winding and unwinding the cable, and can well pass the cable through the cable winding and unwinding channel; when the cable is completely retracted, the cable winding and unwinding channel can isolate drilling fluid and prevent the erosion of the drilling fluid; the driving device and the gear and rack mechanism work synchronously, can well arrange and wind and unwind the cable, prevent the cable from being arranged in disorder, improve work efficiency, and save time; the cable clamp can clamp the cable when the cable winding and unwinding is completed, prevent the cable from automatically floating up when the cable is tightened, and prevent the cable from being pulled by the rotating drum when the cable is tightened, so that the cable is broken. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a downhole cable automatic winding and unwinding device.

[0027] Figure 2 It is Figure 1 It is an enlarged schematic diagram of A in FIG.

[0028] Figure 3 It is Figure 1 It is an enlarged schematic diagram of B in FIG.

[0029] Figure 4 It is a structural schematic diagram of a gear and rack mechanism.

[0030] The application relates to a downhole cable automatic winding and unwinding device, which is entirely arranged in a drilling rod, can supply power to downhole equipment at any time, can monitor the drilling process, can reduce the stopping and starting of drilling, can greatly reduce time and manpower for winding and unwinding the cable, and can well pass the cable through the cable winding and unwinding channel; when the cable is completely retracted, the cable winding and unwinding channel can isolate drilling fluid and prevent the erosion of the drilling fluid; the driving device and the gear and rack mechanism work synchronously, can well arrange and wind and unwind the cable, prevent the cable from being arranged in disorder, improve work efficiency, and save time; the cable clamp can clamp the cable when the cable winding and unwinding is completed, prevent the cable from automatically floating up when the cable is tightened, and prevent the cable from being pulled by the rotating drum when the cable is tightened, so that the cable is broken. DETAILED DESCRIPTION

[0031] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element preceded by "comprises... " does not exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0032] The features and properties of the present application will be further described using the following examples.

[0033] Example One

[0034] Please refer to Figures 1-4 A downhole cable automatic winding and unwinding device is arranged inside a drill rod, comprising:

[0035] A wellhead sub 1, a cable winding and unwinding sub first section 2, a cable winding and unwinding sub tail section 3, and a measuring instrument sub 5; the wellhead sub 1 is used to connect with a cable; the cable winding and unwinding sub first section 2 is provided with a cable passage 6; the cable winding and unwinding sub tail section 3 is provided with a cable winding and unwinding device; the measuring instrument sub 5 is provided with a measuring instrument 7; one end of the cable passes through the cable passage 6 to connect with the wellhead sub 1, and the other end is connected with the measuring instrument 7, and the automatic winding and unwinding of the cable is realized through the cable winding and unwinding device.

[0036] In this embodiment, specifically, the wellhead sub 1 is arranged at a wellhead position, comprising:

[0037] A wireless charging signal receiver 8 for connecting with a cable and a first protective sleeve for isolating drilling fluid; the first protective sleeve is sleeved on the wireless charging signal receiver 8; one end of the cable is connected with the wireless charging signal receiver 8 through magnetic attraction.

[0038] In this embodiment, specifically, one end of the cable provided with a wireless charging signal receiver 8 is provided with a cable auxiliary floating device 9 for assisting the cable to float in the drilling fluid; preferably, the cable auxiliary floating device 9 is a floating ball or other device capable of providing buoyancy to the cable.

[0039] In this embodiment, specifically, the cable winding and unwinding device, comprising:

[0040] A drum 10 for cable winding and a driving device for driving the drum to rotate; the cable is wound on the drum 10, and the driving device is arranged below the drum 10; that is, the winding and unwinding of the cable can be realized through the rotation of the drum 10.

[0041] In the embodiment, specifically, the drum 10 is provided with bearings 11 at both upper and lower ends, which assist the rotation of the drum 10, and the bearings 11 are fixed in the drill pipe through isolation plates 12; the drilling fluid can be prevented from entering the cable winding and unwinding sub tail section 3 through the upper and lower isolation plates 12, so as to avoid long-time soaking.

[0042] The upper end of the drum 10 is provided with a cable clamp 13, which can lock the cable to prevent the cable from floating up; it should be noted that the specific structure of the cable clamp 13 is a conventional technology in the art, which will not be described here.

[0043] In the embodiment, specifically, the driving device comprises a motor fixing disc 14, a reducer fixing disc 15, a first motor 16 and a rotating disc 17; the reducer fixing disc 15 is located above the motor fixing disc 14, the first motor 16 is installed on the motor fixing disc 14, the output end of the first motor 16 is connected with the lower side of the rotating disc 17 through a reducer and a shaft coupling, and the upper side of the rotating disc 17 is connected with the drum 10.

[0044] In the embodiment, specifically, the drum 10 is hollow at both ends and serves as a drilling fluid circulation passage 18;

[0045] The second protective sleeve is arranged on the inner wall of the drill pipe and between the two isolation plates 12, so as to prevent the drilling fluid from entering the cable winding and unwinding sub tail section 3 from the outside of the drill pipe and further isolate the drilling fluid.

[0046] In the embodiment, specifically, the cable winding and unwinding device further comprises:

[0047] A gear and rack mechanism 19, the gear and rack mechanism 19 comprises a sliding rail 20, a sliding block 21 movably installed on the sliding rail 20, a rack 22 arranged on the sliding rail 20, a second motor 23 installed on the sliding block 21, a gear 24 connected with the rack 22 on the second motor 23, and two pulleys 25 installed on the sliding block 21, and the cable passes between the two pulleys 25; preferably, the cable winding and unwinding device and the drum 10 can be separated by a partition plate; the cable is turned through the two pulleys 25, and the cable is assisted to be arranged.

[0048] In the embodiment, specifically, the cable is connected between the drum 10 and the measuring instrument 7 through the brush and the commutator; it is to be noted that the connection form is not shown in the figure, and the signal transmission through the brush and the commutator is known to those skilled in the art, and thus is not described here; secondly, the brush and the commutator are arranged for cable signal transmission, and the purpose is to avoid the rotation of the drum 10 to drive the cable below to be reeled in and out; preferably, there is also a cable left in the drum 10, so as to provide a margin for the rotation of the drum 10 and avoid the synchronous reeling in and out of the cable below.

[0049] In the embodiment, specifically, the cable is connected between the drum 10 and the measuring instrument 7 through the brush and the commutator; it is to be noted that the connection form is not shown in the figure, and the signal transmission through the brush and the commutator is known to those skilled in the art, and thus is not described here; secondly, the brush and the commutator are arranged for cable signal transmission, and the purpose is to avoid the rotation of the drum 10 to drive the cable below to be reeled in and out; preferably, there is also a cable left in the drum 10, so as to provide a margin for the rotation of the drum 10 and avoid the synchronous reeling in and out of the cable below.

[0050] The battery section 4, the cable reeling-in and out section first segment 2, the cable reeling-in and out section tail segment 3, the battery section 4, and the measuring instrument section 5 are sequentially connected through threads.

[0051] The battery section 4 comprises a battery fixing disc 26, and the battery fixing disc 26 is provided with a battery 27, and the cable can charge the battery 27; preferably, the battery fixing disc 26 is provided with two battery fixing discs 26, one of which is located at the end of the cable reeling-in and out section, and the other of which is located at the measuring instrument section 5, so as to prevent the cable channel 6 from being misaligned when the sections are connected; the battery fixing disc 26 is provided with an internal opening, the cable can reach the battery 27, the lower end of the battery 27 is provided with an opening of the battery fixing disc 26, the cable can come out of the battery 27 and enter the channel in the wall of the section, and the cable is connected to the measuring instrument 7.

[0052] When the cable is reeled in underground, the wellhead sends a signal, the measuring instrument 7 underground receives the signal, the measuring instrument 7 sends a signal, the driving device, the gear and rack mechanism 19, and the cable clamp 13 receive the signal and start to work, the cable clamp 13 is loosened, the upper end of the cable starts to rise by buoyancy, the driving device works to loosen the cable on the drum, so as to facilitate the cable to float up, and the gear and rack mechanism 19 works to arrange the cable and prevent the cable from being in disorder.

[0053] When the cable reaches the wellhead and is attracted by the wireless charging signal receiver 8, the wellhead sends a signal to the underground, the measuring instrument 7 receives the signal and sends it to the driving device, the gear and rack mechanism 19, and the cable clamp 13 to stop working; after the charging is completed, the wellhead sends a signal to the underground, and the driving device works in the reverse direction to realize the circulation.

[0054] The above embodiment only expresses the specific implementation of the present application, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the protection scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application.

[0055] This Background section is intended to provide a general overview of the context of the application, the work of the current named inventors, to the extent the work is associated with the present application, and the work of others in the field of the application to the extent the work is associated with the present application, and to the extent the work described in this section is associated with the present application, neither expressly nor impliedly, is admitted to be prior art to the present application.

Claims

1. A downhole cable auto-reel, characterized by, The downhole cable automatic winding and unwinding device is arranged in the drill pipe and comprises: a wellhead short section (1), a cable winding and unwinding short section first segment (2), a cable winding and unwinding short section tail segment (3), and a measuring instrument short section (5); the wellhead short section (1) is used for connecting with the cable; the cable winding and unwinding short section first segment (2) is internally provided with a cable passage (6); the cable winding and unwinding short section tail segment (3) is internally provided with a cable winding and unwinding device; the measuring instrument short section (5) is internally provided with a measuring instrument (7); one end of the cable passes through the cable passage (6) and is used for connecting with the wellhead short section (1), and the other end is connected with the measuring instrument (7) and realizes automatic winding and unwinding of the cable through the cable winding and unwinding device; further comprising: a battery pack short section (4), the cable winding and unwinding short section first segment (2), the cable winding and unwinding short section tail segment (3), the battery pack short section (4), and the measuring instrument short section (5) are sequentially connected through threads; the battery pack short section (4) comprises a battery fixing disc (26), the battery fixing disc (26) is provided with a battery (27), and the cable can charge the battery (27); the battery fixing disc (26) is provided with two battery fixing discs (26), one of which is located at the end of the cable winding and unwinding short section, and the other of which is located at the measuring instrument short section (5), so as to prevent the cable passage (6) from being misaligned when the short sections are connected; the battery fixing disc (26) is internally provided with an opening, the cable can reach the battery (27), the lower end of the battery (27) is provided with an opening of the battery fixing disc (26), the cable can come out of the battery (27) and enter the passage in the wall of the short section, and the cable is connected to the measuring instrument (7); the wellhead short section (1) is arranged at a wellhead part and comprises: a wireless charging signal receiver (8) for connecting the cable and a first protective sleeve for isolating drilling fluid; the first protective sleeve is arranged on the wireless charging signal receiver (8); one end of the cable is connected to the wireless charging signal receiver (8) through magnetic attraction; one end of the cable is provided with a cable auxiliary floating device (9) for assisting the cable to float in the drilling fluid; the cable winding and unwinding device comprises: a roller (10) for winding the cable and a driving device for driving the roller to rotate; the cable is wound on the roller (10), and the driving device is arranged below the roller (10); the roller (10) is provided with bearings (11) at both ends, which assist the roller (10) to rotate, and the bearings (11) are fixed in the drill pipe through isolation plates (12); the roller (10) is provided with a cable clamp (13) at the upper end, which can lock the cable to prevent the cable from floating; the roller (10) is hollow at both ends and is used as a drilling fluid flow passage (18); a second protective sleeve is arranged on the inner wall of the drill pipe and between the two isolation plates (12).

2. A downhole cable automatic reel according to claim 1, wherein, The driving device comprises a motor fixing disc (14), a reducer fixing disc (15), a first motor (16) and a rotating disc (17); the reducer fixing disc (15) is located above the motor fixing disc (14), the first motor (16) is installed on the motor fixing disc (14), the output end of the first motor (16) is connected with the rotating disc (17) below through a reducer and a shaft coupling, and the rotating disc (17) is connected with the roller (10) above.

3. A downhole cable automatic reel according to claim 1, wherein, The cable winding and unwinding device further comprises: A gear and rack mechanism (19) comprises a sliding rail (20), a sliding block (21) movably installed on the sliding rail (20), a rack (22) arranged on the sliding rail (20), a second motor (23) installed on the sliding block (21), a gear (24) connected with the rack (22) and matched with the rack (22), and two pulleys (25) installed on the sliding block (21), wherein the cable passes between the two pulleys (25).

4. An automatic wireline reel according to claim 1, wherein, The cable is connected between the roller (10) and the measuring instrument (7) through a brush and a commutator.

Images