Optical fiber crossing device for photoelectric composite logging downhole instrument

Abstract

The invention relates to an optical fiber crossing device of a photoelectric composite logging downhole instrument, which comprises a cable, an optical fiber, an upper storage cylinder, a crossing short section upper joint, a conversion correction short section, a crossing short section lower joint and a lower storage cylinder, the upper storage cylinder is connected with the crossing short section upper joint, and a cable channel is arranged in the crossing short section upper joint; a first bypass channel is arranged on the side wall of the crossing pup joint upper connector, a conventional downhole instrument is connected between the crossing pup joint upper connector and the conversion correction pup joint, the conversion correction pup joint is connected with the crossing pup joint lower connector, a second bypass channel is arranged on the crossing pup joint lower connector, and the crossing pup joint lower connector is connected with the lower storage barrel. An optical fiber protection tube is connected between the first bypass channel and the second bypass channel, a cable penetrates through the upper storage barrel and the cable channel and is connected with a conventional downhole instrument, and the cable and an optical fiber penetrate through the upper storage barrel, the first bypass channel, the optical fiber protection tube, the second bypass channel and the lower storage barrel. The device has the advantage that the requirement for combined logging of the underground optical fiber sensor and a conventional logging instrument can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oilfield optical fiber logging operation, in particular to a kind of photoelectric composite logging downhole instrument fiber spanning device. BACKGROUND

[0002] With the development of optical fiber measurement technology, the gradual maturity of optical fiber detection and optical fiber sensing technology, the application of oilfield logging photoelectric composite cable, using optical fiber sensor and conventional downhole instrument simultaneously logging data acquisition, can effectively improve the coincidence rate of logging interpretation in some specific environment, to comprehensively evaluate the working condition of oil well, since optical fiber sensor and conventional downhole instrument are connected in series, there is no downhole photoelectric combined logging connecting tool and mode, the connection and data transmission of two different types of instruments, and diversity free combination cannot be realized.

[0003] At present, there is no downhole tool to effectively realize the series connection of two types of instruments to solve this problem, so it is necessary to develop a combined measuring device that can meet the above needs. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a kind of photoelectric composite logging downhole instrument fiber spanning device, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the present application to solve the above technical problems is as follows:

[0006] A kind of photoelectric composite logging downhole instrument fiber spanning device, comprising a plurality of cables, optical fibers and sequentially arranged along the long axis direction upper storage cylinder, spanning short section upper connector, conversion correction short section, spanning short section lower connector and lower storage cylinder, one end of the upper storage cylinder is connected with one end of the spanning short section upper connector, the spanning short section upper connector is provided with a cable passage axially penetrating it in the middle, the spanning short section upper connector is provided with a first side branch passage penetrating both ends thereof in the side wall, a conventional downhole instrument is connected between the other end of the spanning short section upper connector and one end of the conversion correction short section, the other end of the conversion correction short section is connected with one end of the spanning short section lower connector, the spanning short section lower connector is provided with a second side branch passage axially penetrating it in the middle, the other end of the spanning short section lower connector is connected with one end of the lower storage cylinder, the first side branch passage and the second side branch passage are coaxial along the long axis, and the optical fiber protection tube is connected between the first side branch passage and the second side branch passage, one of the cables sequentially passes through the upper storage cylinder and the cable passage, and is connected with the conventional downhole instrument, the remaining cables and optical fibers sequentially pass through the upper storage cylinder, the first side branch passage, the optical fiber protection tube, the second side branch passage and the lower storage cylinder, and are connected with the optical fiber sensor.

[0007] On the basis of the above technical scheme, the present application can also be improved as follows.

[0008] Further, one end of the upper receiving cylinder is provided with a cylindrical first connecting part, a first ring groove is arranged on the surface of the first connecting part, a first sealing ring is nested at the end of the first connecting part, a first lock nut is sleeved at the first ring groove, the outer surface of the first lock nut is provided with threads, one end of the crossover sub upper connector is provided with a cylindrical first connecting sleeve, the inner wall of the first connecting sleeve is provided with internal threads extending to the end thereof, the surface of the first connecting part is further provided with a first positioning key, a first key groove is arranged on the inner wall of the first connecting sleeve along the axial direction thereof, the first connecting sleeve is screwed onto the outer surface of the first lock nut, the first positioning key is embedded in the first key groove, and the first sealing ring is in sealing contact with the inner wall of the first connecting sleeve.

[0009] Further, the other end of the crossover sub upper connector is provided with a cylindrical adapter part, one end of the conventional downhole instrument is provided with a sleeve part sleeved on the outer surface of the adapter part, and a second sealing ring in sealing connection with the sleeve part is embedded on the outer surface of the adapter part.

[0010] Further, one end of the conversion and correction sub is provided with an internally threaded assembly groove, the other end of the conventional downhole instrument is provided with a sleeve part matched with the internally threaded assembly groove, and the outer surface of the sleeve part is provided with external threads and is screwed into the internally threaded assembly groove.

[0011] Further, the other end of the conversion and correction sub is provided with a cylindrical adapter column, a second ring groove is arranged on the surface of the adapter column, a third sealing ring is nested at the end of the adapter column, a second lock nut is sleeved at the second ring groove, the outer surface of the second lock nut is provided with threads, one end of the crossover sub lower connector is provided with a cylindrical second connecting sleeve, the inner wall of the second connecting sleeve is provided with internal threads extending to the end thereof, the surface of the adapter column is further provided with a second positioning key, a second key groove is arranged on the inner wall of the second connecting sleeve along the axial direction thereof, the second connecting sleeve is screwed onto the outer surface of the second lock nut, the second positioning key is embedded in the second key groove, and the third sealing ring is in sealing contact with the inner wall of the second connecting sleeve.

[0012] Further, one end of the lower receiving cylinder is provided with a cylindrical third connecting part, a third ring groove is arranged on the surface of the third connecting part, a fourth sealing ring is nested at the end of the third connecting part, a third lock nut is sleeved at the third ring groove, the outer surface of the third lock nut is provided with threads, the other end of the crossover sub lower connector is provided with a cylindrical third connecting sleeve, the inner wall of the third connecting sleeve is provided with internal threads extending to the end thereof, the surface of the third connecting part is further provided with a third positioning key, a third key groove is arranged on the inner wall of the third connecting sleeve along the axial direction thereof, the third connecting sleeve is screwed onto the outer surface of the third lock nut, the third positioning key is embedded in the third key groove, and the fourth sealing ring is in sealing contact with the inner wall of the third connecting sleeve.

[0013] Further, the first branch channel has a first straight section penetrating the other end of the cross-over short section along the long axis of the upper joint of the cross-over short section, the second branch channel has a second straight section penetrating the one end of the cross-over short section along the long axis of the lower joint of the cross-over short section, the two ends of the optical fiber protection tube are inserted into the first straight section and the second straight section respectively, and the two ends of the optical fiber protection tube are sealed and connected with the first straight section and the second straight section through the sealing assembly.

[0014] Further, the first straight section and the second straight section are both internally threaded holes, the sealing assembly comprises a sealing nut and a plurality of fifth sealing rings, the sealing nut has a through hole coaxially opened and matched with the optical fiber protection tube, the sealing nut is sleeved on the end of the optical fiber protection tube and screwed into the corresponding first straight section or second straight section, and the plurality of fifth sealing rings are stacked and sleeved on the end of the optical fiber protection tube and sealed and fitted into the corresponding first straight section or second straight section.

[0015] Further, the optical fiber protection tube is a steel tube.

[0016] Further, the other end of the first branch channel is fixedly provided with an instrument plug matched with the conventional downhole instrument and inserted into the instrument plug, and one of the cables is connected with the instrument plug.

[0017] The present application has the advantages that the structure is reasonable, can meet the needs of the combination logging of the downhole optical fiber sensor and the conventional logging instrument, can solve the problems in logging by using different combination logging methods, can research the cable line for transmitting the electric signal and the optical fiber for transmitting the optical signal, and can realize the simultaneous transmission and recording of the electric signal and the optical signal by spanning between different types of downhole instruments. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic diagram of the optical fiber spanning device of the optical-electric composite logging downhole instrument of the present application;

[0019] Figure 2 FIG. 3 is a partial structural schematic diagram of the assembly of the upper receiving cylinder and the upper joint of the cross-over short section in the optical fiber spanning device of the optical-electric composite logging downhole instrument of the present application;

[0020] Figure 3 FIG. 5 is a partial structural schematic diagram of the assembly of the optical fiber protection tube and the first branch channel in the optical fiber spanning device of the optical-electric composite logging downhole instrument of the present application;

[0021] Figure 4 FIG. 7 is a partial structural schematic diagram of the assembly of the conversion and correction short section and the lower joint of the cross-over short section in the optical fiber spanning device of the optical-electric composite logging downhole instrument of the present application;

[0022] Figure 5This is a partial structural diagram of the assembly of the lower connector of the crossing section and the lower receiving cylinder in the optical fiber crossing device of the photoelectric composite logging downhole instrument of the present invention.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Upper storage tube; 2. Upper connector of crossover sub; 3. Conversion and correction sub; 4. Lower connector of crossover sub; 5. Lower storage tube; 6. Cable; 7. Optical fiber; 8. Conventional downhole instruments; 9. Optical fiber protection tube; 11. First connection part; 12. First sealing ring; 13. First union; 14. First positioning key; 21. Cable channel; 22. First side branch channel; 23. Connecting part; 31. Connecting post; 32. Third sealing ring; 33. Second union; 34. Second positioning key; 41. Second side branch channel; 42. Second connecting collar; 43. Third connecting collar; 51. Third connection part; 52. Fourth sealing ring; 53. Third union; 54. Third positioning key; 81. Instrument plug; 101. Sealing nut; 102. Fifth sealing ring; 211. First connecting collar. Detailed Implementation

[0025] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] Example: Figure 1 As shown, the optical fiber crossing device for the photoelectric composite logging downhole instrument in this embodiment includes multiple cables 6, optical fibers 7, and an upper storage tube 1, a crossing sub upper connector 2, a conversion and correction sub 3, a crossing sub lower connector 4, and a lower storage tube 5 arranged sequentially along the long axis. One end of the upper storage tube 1 is connected to one end of the crossing sub upper connector 2. The crossing sub upper connector 2 has an axially penetrating cable channel 21 in its middle. The side wall of the crossing sub upper connector 2 has a first side branch channel 22 penetrating both ends. The other end of the crossing sub upper connector 2 is connected to a conventional downhole instrument 8 between it and one end of the conversion and correction sub 3. The other end of the conversion and correction sub 3... One end of the lower connector 4 of the aforementioned cross-section is connected to the middle of the lower connector 4, which has a second side channel 41 axially penetrating it. The other end of the lower connector 4 of the aforementioned cross-section is connected to one end of the aforementioned lower receiving cylinder 5. The long axis of the aforementioned first side channel 22 and the second side channel 41 coincides, and an optical fiber protection tube 9 is connected between them. One of the aforementioned cables 6 passes through the aforementioned upper receiving cylinder 1 and cable channel 21 in sequence and is connected to the aforementioned conventional downhole instrument 8. The remaining cables 6 and optical fibers 7 pass through the aforementioned upper receiving cylinder 1, first side channel 22, optical fiber protection tube 9, second side channel 41 and lower receiving cylinder 5 in sequence and are connected to the optical fiber sensor.

[0027] In this embodiment, the overall design is distributed in a serial manner by the upper receiving cylinder 1, the crossover short section upper joint 2, the conventional downhole instrument 8, the conversion correction short section 3, the crossover short section lower joint 4 and the lower receiving cylinder 5, wherein the conventional downhole instrument 8 and the optical fiber sensor can be independently arranged in the device, and the simultaneous transmission of electrical signals and optical signals is realized by connecting with the respective corresponding cable and optical fiber and crossing between different types of downhole instruments.

[0028] As a preferred embodiment, as shown in Figure 2 The upper end of the upper receiving cylinder 1 is provided with a cylindrical first connecting part 11, the surface of the first connecting part 11 is provided with a first ring groove, the end of the first connecting part 11 is nested with a first sealing ring 12, the first ring groove is sleeved with a first bynum 13, the outer surface of the first bynum 13 is provided with a thread, the upper end of the crossover short section upper joint 2 is provided with a cylindrical first connecting sleeve ring 211, the inner wall of the first connecting sleeve ring 211 is provided with an internal thread extending to the end thereof, the surface of the first connecting part 11 is further provided with a first positioning key 14, the inner wall of the first connecting sleeve ring 211 is provided with a first key groove along the axial direction thereof, the first connecting sleeve ring 211 is screwed onto the outer surface of the first bynum 13, the first positioning key 14 is embedded in the first key groove, and the first sealing ring 12 is in sealing contact with the inner wall of the first connecting sleeve ring 211.

[0029] In the above embodiment, the first bynum 13 is divided into two parts during assembly and is formed by two parts, which are clamped on both sides of the first ring groove. After the first connecting sleeve ring 211 of the crossover short section upper joint 2 is screwed onto the first bynum 13, since the first bynum 13 can rotate relative to the first ring groove (that is, the first connecting part 11), when the first bynum 13 is operated to rotate, since the first connecting part 11 is embedded in the first key groove of the first connecting sleeve ring 211 through the first positioning key 14, the crossover short section upper joint 2 will not rotate with the first bynum 13 (to ensure that the optical fiber will not be twisted and broken), but will rotate relative to the first bynum 13 (that is, remain non-rotating in the circumferential direction). Since the first bynum 13 does not displace in the longitudinal direction, the crossover short section upper joint 2 will move along the longitudinal direction, so that one end of the optical fiber protection tube 9 can be inserted into the first bypath 22 after the first bynum 13 is screwed, thereby realizing a tight connection.

[0030] In this embodiment, the other end of the crossover short section upper joint 2 is provided with a cylindrical connector 23, one end of the conventional downhole instrument 8 is provided with a plug-in part sleeved on the outer surface of the connector 23, and the outer surface of the connector 23 is embedded with a second sealing ring in sealing connection with the plug-in part. By providing the connector 23 and realizing stable butt joint with one end of the conventional downhole instrument 8, the conventional downhole instrument 8 can be firmly assembled in the device.

[0031] Meanwhile, one end of the conversion and correction nipple 3 is provided with an internally threaded assembly groove, and the other end of the conventional downhole instrument 8 is provided with a sleeve insertion part adapted to the internally threaded assembly groove, and the outer surface of the sleeve insertion part is provided with external threads and is screwed into the internally threaded assembly groove. In this way, the other end of the conventional downhole instrument 8 can be tightly screwed into the internally threaded assembly groove of one end of the conversion and correction nipple 3, so that the conventional downhole instrument 8 can be firmly assembled.

[0032] As a preferred embodiment, as shown in Figure 3 The other end of the conversion and correction nipple 3 is provided with a cylindrical connector post 31, the surface of the connector post 31 is provided with a second ring groove, the end of the connector post 31 is nested with a third sealing ring 32, the second ring groove is sleeved with a second bynum 33, the outer surface of the second bynum 33 is provided with threads, one end of the crossover nipple lower connector 4 is provided with a cylindrical second connecting sleeve ring 42, the inner wall of the second connecting sleeve ring 42 is provided with an internal thread extending to the end thereof, the surface of the connector post 31 is further provided with a second positioning key 34, the inner wall of the second connecting sleeve ring 42 is provided with a second key groove along the axial direction thereof, the second connecting sleeve ring 42 is screwed onto the outer surface of the second bynum 33, the second positioning key 34 is embedded in the second key groove, and the third sealing ring 32 is in sealing contact with the inner wall of the second connecting sleeve ring 42.

[0033] In the above embodiment, the second bynum 33 is divided into two parts during assembly and is formed by two parts, which are clamped on both sides of the second ring groove. After the second connecting sleeve ring 42 is screwed onto the second bynum 33, since the second bynum 33 can rotate relative to the second ring groove (i.e., the connector post 31), when the second bynum 33 is rotated, since the connector post 31 is embedded in the second key groove of the second connecting sleeve ring 42 through the second positioning key 34, the crossover nipple lower connector 4 will not rotate with the second bynum 33 (to ensure that the optical fiber will not be twisted and broken), but will have a relative rotational movement with the second bynum 33 (i.e., remain non-rotating in the circumferential direction). Since the second bynum 33 does not have displacement in the longitudinal direction, the crossover nipple lower connector 4 will move in the longitudinal direction, so that the other end of the optical fiber protection tube 9 can be inserted into the second side passage 41 after the second bynum 33 is screwed, to achieve tight connection. In combination with the tight insertion of the first side passage 22 and the other end of the optical fiber protection tube 9, the optical fiber protection tube 9 can be stably inserted into the two side passages.

[0034] As a preferred embodiment, as shown in Figure 4As shown, one end of the lower accommodating cylinder 5 is provided with a cylindrical third connecting part 51, the surface of the third connecting part 51 is provided with a third ring groove, the end of the third connecting part 51 is nested with a fourth sealing ring 52, the third ring groove is sleeved with a third nipple 53, the outer surface of the third nipple 53 is provided with a thread, the other end of the cross-section short section lower connector 4 is provided with a cylindrical third connecting sleeve ring 43, the inner wall of the third connecting sleeve ring 43 is provided with an internal thread extending to the end thereof, the surface of the third connecting part 51 is further provided with a third positioning key 54, the inner wall of the third connecting sleeve ring 43 is provided with a third key groove along the axial direction thereof, the third connecting sleeve ring 43 is screwed on the outer surface of the third nipple 53, the third positioning key 54 is embedded in the third key groove, and the fourth sealing ring 52 is in sealing contact with the inner wall of the third connecting sleeve ring 43.

[0035] In the above embodiment, the third nipple 53 is divided into two parts during assembly, and is clamped on both sides of the third ring groove. After the third connecting sleeve ring 43 is screwed on the third nipple 53, since the third nipple 53 can rotate relative to the third ring groove (i.e. the third connecting part 51), when the third nipple 53 is operated to rotate, since the third connecting part 51 is embedded in the third key groove of the third connecting sleeve ring 43 through the third positioning key 54, the lower accommodating cylinder 5 will not rotate with the third nipple 53, but will rotate relative to the third nipple 53. Since the third nipple 53 does not displace along the longitudinal direction, the lower accommodating cylinder 5 will move along the longitudinal direction until it is tightly installed.

[0036] As a preferred embodiment, the first side branch passage 22 has a first straight section extending through the other end of the cross-section short section upper connector 2 along the longitudinal direction thereof, the second side branch passage 41 has a second straight section extending through one end of the cross-section short section lower connector 4 along the longitudinal direction thereof, the two ends of the optical fiber protection tube 9 are respectively inserted into the first straight section and the second straight section, and the two ends of the optical fiber protection tube 9 are respectively sealed and connected to the first straight section and the second straight section through sealing assemblies.

[0037] In the above embodiment, the first side branch passage 22 has a first inclined section and a first straight section, the first inclined section extends towards one end of the cross-section short section upper connector 2 and penetrates into the cable passage 21, the second side branch passage 41 has a second inclined section and a second straight section, the second inclined section extends towards the other end of the cross-section short section lower connector 4 and penetrates into the inner cavity of the lower accommodating cylinder 5, which ensures that the optical fiber is smoothly laid in the specific passage inside the device, and at the same time, the axial holes of the first straight section and the second straight section (the axes of the two coincide), during assembly, the cross-section short section upper connector 2 and the cross-section short section lower connector 4 will not rotate in the circumferential direction, and the optical fiber will not be twisted and distorted.

[0038] In the present embodiment, as shown in FIG. 1, the cross-section short section upper connector 2 is provided with a cable passage 21, the cable passage 21 is provided with a first side branch passage 22, the cross-section short section lower connector 4 is provided with a second side branch passage 41, and the two ends of the optical fiber protection tube 9 are respectively inserted into the first side branch passage 22 and the second side branch passage 41. Figure 5As shown, the first flat section and the second flat section are both internally threaded holes, the sealing assembly comprises a sealing nut 101 and a plurality of fifth sealing rings 102, the sealing nut 101 is coaxially provided with a through hole matched with the optical fiber protection tube 9, the sealing nut 101 is sleeved on the end of the optical fiber protection tube 9 and screwed into the corresponding first flat section or second flat section, and the plurality of fifth sealing rings 102 are stacked and sleeved on the end of the optical fiber protection tube 9 and sealed in the corresponding first flat section or second flat section. Tightening the sealing nut 101 can extrude the plurality of fifth sealing rings 102 (or sealing gaskets) to achieve the tight connection and sealing of the first flat section and the second flat section with the two ends of the optical fiber protection tube 9, and the design is relatively simple and the operation is relatively convenient.

[0039] In the embodiment, the optical fiber protection tube 9 is a steel tube, which has high strength, is not easy to break, and has good protection performance.

[0040] In the embodiment, the other end of the first side branch passage 22 is fixedly provided with an instrument plug 81 matched with and inserted into the conventional downhole instrument 8, and one of the cables 6 is connected with the instrument plug 81.

[0041] The installation method of the optical fiber spanning device of the photoelectric composite logging downhole instrument in the embodiment is as follows:

[0042] Step one: first, the plurality of cables 6 and optical fibers 7 led out of the photoelectric composite cable hanger are passed through the upper receiving cylinder 1, and the other end of the upper receiving cylinder 1 is threadedly connected and sealed with the photoelectric composite cable hanger, wherein two cables 6 and one optical fiber 7 are reserved according to the length of the spanning instrument and led out from one end of the upper receiving cylinder 1;

[0043] Step two: the optical fiber 7 and one of the cables 6 are passed through the first side branch passage 22 of the spanning short section upper joint 2, then the first spanner 13 is installed at one end of the upper receiving cylinder 1, the other end of the spanning short section upper joint 2 is screwed outside the first spanner 13, the first positioning key 14 is embedded in the first key groove, and at the same time, one of the cables 6 is passed through the cable passage 21 and connected with the conventional downhole instrument 8 to realize power supply and signal transmission of the instrument;

[0044] Step three: the optical fiber protection tube 9 is inserted into the first side branch passage 22 at the other end of the spanning short section upper joint 2, the conversion and correction short section 3 is installed at the other end of the conventional downhole instrument 8, and the two ends of the conventional downhole instrument 8 are connected with the other end of the spanning short section upper joint 2 and the other end of the conversion and correction short section 3, respectively.

[0045] Step four, install the second by the ren 33 on the other end of the crossover short section 3, then screw the second connecting ring 42 across the lower end of the short section 4 on the outside of the second by the ren 33, and make sure that the second positioning key 34 is embedded in the second key groove, and make sure that the second side passage 41 and the first side passage 22 are aligned, in the process, the other end of the optical fiber protection tube 9 is inserted into the second side passage 41, at the same time, the optical fiber passes through the optical fiber protection tube 9 and the second side passage 41, then rotate the second by the ren 33, so that the lower end of the crossover short section 4 moves towards the upper end of the crossover short section 2, or rotate the first by the ren 13 at the same time, so that the upper end of the crossover short section 2 moves towards the lower end of the crossover short section 4 synchronously, so that the both ends of the optical fiber protection tube 9 are tightly inserted into the first side passage 22 and the second side passage 41;

[0046] Step five, seal the first side passage 22 and the second side passage 41 by the sealing nut 101 and the plurality of fifth sealing rings 102 pre-installed at both ends of the optical fiber protection tube 9;

[0047] Step six, screw the third connecting part 51 of the lower receiving barrel 5 with the third by the ren 53 into the third connecting ring 43 on the other end of the lower end of the crossover short section 4, and make the third positioning key 54 and the third key groove fit, then rotate the third by the ren 53, so that the lower receiving barrel 5 is tightly installed;

[0048] Finally, the optical fiber 7 and one of the cable lines 6 are led out of the other end of the lower receiving barrel 5 and connected with the tail end optical fiber sensor, realizing the power supply and optical signal transmission of the optical fiber sensor, completing the installation of the optical fiber crossover device of the optical and electrical composite logging downhole instrument, realizing the crossover sealing of the optical fiber / cable line, and the simultaneous acquisition, transmission and recording of the downhole optical signal and electrical signal.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0050] In addition, the terms "first", "second", etc. are used only for the purpose of description and do not imply or imply relative importance or imply the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0053] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0054] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. An optical fiber spanning device for a photoelectric composite logging downhole instrument, characterized by: The utility model provides a kind of downhole cable and optical fiber transmission device, including multiple cables (6), optical fiber (7) and sequentially arranged along the long axis direction upper storage cylinder (1), across short section upper joint (2), conversion correction short section (3), across short section lower joint (4) and lower storage cylinder (5), one end of the upper storage cylinder (1) is connected with one end of the across short section upper joint (2), the cable passage (21) that is axially through it is equipped in the across short section upper joint (2) middle, the first side branch passage (22) that is through both ends is equipped in the across short section upper joint (2) side wall, the other end of the across short section upper joint (2) is connected with one end of the conversion correction short section (3) between the conventional downhole instrument (8), the other end of the conversion correction short section (3) is connected with one end of the across short section lower joint (4), the second side branch passage (41) that is axially through it is equipped in the across short section lower joint (4) middle, the other end of the across short section lower joint (4) is connected with one end of the lower storage cylinder (5), the first side branch passage (22) and second side branch passage (41) long axis coincide, and optical fiber protection tube (9) is connected between the two, one of the cable (6) sequentially passes through the upper storage cylinder (1) and cable passage (21), and is connected with the conventional downhole instrument (8), and the remaining cable (6) and optical fiber (7) sequentially pass through the upper storage cylinder (1), first side branch passage (22), optical fiber protection tube (9), second side branch passage (41) and lower storage cylinder (5), and are connected optical fiber sensor.

2. The fiber span device for a photoelectric combination logging downhole instrument according to claim 1, characterized in that: One end of the upper storage cylinder (1) is equipped with the first connecting part (11) of cylindrical shape, the surface of the first connecting part (11) is equipped with the first ring groove, the end of the first connecting part (11) is nested with the first sealing ring (12), the first ring groove is fitted with the first by the ring (13), the outer surface of the first by the ring (13) is equipped with screw thread, one end of the across short section upper joint (2) is equipped with the first connecting sleeve ring (211) of cylindrical shape, the inner wall of the first connecting sleeve ring (211) is equipped with internal thread extending to its end, the surface of the first connecting part (11) is further equipped with the first positioning key (14), the first connecting sleeve ring (211) inner wall is equipped with the first key groove along its axial direction, the first connecting sleeve ring (211) is screwed on the outer surface of the first by the ring (13), and the first positioning key (14) is embedded in the first key groove, and the first sealing ring (12) is in sealing contact with the inner wall of the first connecting sleeve ring (211).

3. The fiber span device for a photoelectric combination logging downhole instrument of claim 1, wherein: The other end of the across short section upper joint (2) is equipped with the plug-in part (23) of cylindrical shape, one end of the conventional downhole instrument (8) is equipped with the plug sleeve part fitted on the outer surface of the plug-in part (23), and the outer surface of the plug-in part (23) is embedded with the second sealing ring in sealing connection with the plug sleeve part.

4. The fiber span device for a photoelectric combination logging downhole instrument of claim 1, wherein: One end of the conversion correction short section (3) is equipped with the internal thread assembly groove, the other end of the conventional downhole instrument (8) is equipped with the sleeve plug part matched with the internal thread assembly groove, the outer surface of the sleeve plug part is equipped with external thread, and is screwed in the internal thread assembly groove.

5. The fiber span device for a photoelectric combination logging downhole instrument of claim 1, wherein: The other end of the conversion correction short section (3) is provided with a cylindrical connector post (31), the surface of the connector post (31) is provided with a second ring groove, the end of the connector post (31) is nested with a third sealing ring (32), the second ring groove is sleeved with a second by nut (33), the outer surface of the second by nut (33) is provided with threads, one end of the cross section lower connector (4) is provided with a cylindrical second connecting sleeve ring (42), the inner wall of the second connecting sleeve ring (42) is provided with internal threads extending to the end thereof, the surface of the connector post (31) is further provided with a second positioning key (34), the inner wall of the second connecting sleeve ring (42) is provided with a second key groove along the axial direction thereof, the second connecting sleeve ring (42) is screwed onto the outside of the second by nut (33), the second positioning key (34) is embedded in the second key groove, and the third sealing ring (32) is in sealing contact with the inner wall of the second connecting sleeve ring (42).

6. The fiber span device for a photoelectric combination logging downhole instrument of claim 1, wherein: One end of the lower containing cylinder (5) is provided with a cylindrical third connecting part (51), the surface of the third connecting part (51) is provided with a third ring groove, the end of the third connecting part (51) is nested with a fourth sealing ring (52), the third ring groove is sleeved with a third by nut (53), the outer surface of the third by nut (53) is provided with threads, the other end of the cross section lower connector (4) is provided with a cylindrical third connecting sleeve ring (43), the inner wall of the third connecting sleeve ring (43) is provided with internal threads extending to the end thereof, the surface of the third connecting part (51) is further provided with a third positioning key (54), the inner wall of the third connecting sleeve ring (43) is provided with a third key groove along the axial direction thereof, the third connecting sleeve ring (43) is screwed onto the outside of the third by nut (53), the third positioning key (54) is embedded in the third key groove, and the fourth sealing ring (52) is in sealing contact with the inner wall of the third connecting sleeve ring (43).

7. The fiber span device for a photoelectric combination logging downhole instrument of claim 1, wherein: The first side branch channel (22) has a first straight section extending through the other end of the cross section upper connector (2) along the long axis thereof, the second side branch channel (41) has a second straight section extending through one end of the cross section lower connector (4) along the long axis thereof, and the two ends of the optical fiber protection tube (9) are respectively inserted into the first straight section and the second straight section, and the two ends of the optical fiber protection tube (9) are respectively sealed and connected with the first straight section and the second straight section through sealing assemblies.

8. The fiber span device for a photoelectric combination logging downhole instrument of claim 7, wherein: The first straight section and the second straight section are both internally threaded holes, and the sealing assembly comprises a sealing nut (101) and a plurality of fifth sealing rings (102), the sealing nut is coaxially provided with a through hole matched with the optical fiber protection tube (9), the sealing nut (101) is sleeved on the end of the optical fiber protection tube (9) and is screwed into the corresponding first straight section or second straight section, and a plurality of fifth sealing rings (102) are stacked and sleeved on the end of the optical fiber protection tube (9) and are sealed into the corresponding first straight section or second straight section.

9. The fiber span device for a photoelectric combination logging downhole instrument of any one of claims 1 to 8, characterized in that: The optical fiber protection tube (9) is a steel tube.

10. The fiber span device for a photoelectric combination logging downhole instrument according to any one of claims 1 to 8, characterized in that: The other end port of the first lateral passage (22) is fixedly provided with an instrument plug (81) matched with the conventional downhole instrument (8) and plugged, wherein one of the cables (6) is connected with the instrument plug (81).

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