Underground alignment gamma logging instrument

Abstract

The utility model discloses an underground orientation gamma logging instrument, and relates to the field of gamma logging instruments, the underground orientation gamma logging instrument comprises a centralizer assembly and a compression-resistant cylinder which are distributed from bottom to top, a shock absorber assembly, a gamma module assembly and an expansion device assembly which are distributed from bottom to top are arranged in the compression-resistant cylinder, and the shock absorber assembly is arranged above the centralizer assembly. The gamma module assembly comprises a gamma skeleton, a power supply module, a main control module, a gamma counter and a shielding body which is distributed in an eccentric state. According to the utility model, the expansion pressing plate in the expansion device can be gradually butted with the gamma skeleton by using the fixing screw, so that the expansion ring originally having a certain gap with the inner side wall of the compression-resistant cylinder can be propped against the inner side wall of the compression-resistant cylinder. The upper end of the gamma module assembly is kept in a fixed state by utilizing the tensioner assembly, so that the gamma module assembly can be effectively prevented from axially moving under the working conditions of high vibration and high impact, the stress load of a fixing screw at the lower end is reduced, the reliability of the whole instrument is improved, and the service life of the whole instrument is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gamma logging instrument, especially a downhole azimuth gamma logging instrument. BACKGROUND

[0002] In the oil logging industry, gamma logging technology is usually used in geosteering to measure the intensity of gamma rays released by naturally occurring radioactive substances in the formation. The natural gamma of different formations is different, and the gamma value of general mudstone is the highest, and the gamma value of sandstone and coal is lower. Therefore, gamma logging is often used to judge the lithology of the formation, divide the effective thickness of the formation, and calculate the argillaceous content. Early geosteering generally uses a natural gamma instrument. The natural gamma instrument can barely meet the requirements for some simple underground reservoirs, but for some complex reservoirs with undulating terrain or faults, it is difficult to return to the reservoir once the drill bit has penetrated the reservoir, and it is difficult to determine whether it has penetrated from the top or the bottom of the reservoir. In order to solve the above problems, azimuth gamma logging instruments are introduced into geosteering. Compared with natural gamma logging instruments, azimuth gamma logging instruments have azimuthality and can record gamma rays at different azimuths. Through real-time uploading of up and down gamma data, the azimuth of the drill bit can be quickly adjusted so that it can pass through the reservoir again.

[0003] The existing azimuth gamma instrument has certain uncertainty in the drilling process. With continuous drilling of the instrument, the connecting screws at both ends of the instrument often loosen and break under harsh working conditions such as high temperature, high pressure, vibration, and impact, which can cause malfunctions, inaccurate gamma count rate, large errors, and even damage to the gamma counter, affecting the normal implementation of the detection work. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a downhole azimuth gamma logging instrument.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a downhole azimuth gamma logging instrument, comprising a centralizer assembly and a pressure-resistant cylinder distributed from bottom to top, wherein the pressure-resistant cylinder is provided with a shock absorber assembly, a gamma module assembly, and an expander assembly distributed from bottom to top, and the shock absorber assembly is arranged above the centralizer assembly.

[0006] The gamma module assembly comprises a gamma skeleton, a power module, a main control module, a gamma counter, and a shield body distributed in an eccentric state.

[0007] The expander assembly comprises an expander ring and an expander pressing plate above the expander ring, the top end of the expander pressing plate is provided with an open slot, a fixing screw is arranged in the open slot to fix the expander pressing plate to the top end of the gamma framework, the upper and lower ends of the expander ring are provided with inclined surfaces, the opposite ends of the expander pressing plate and the gamma framework are provided with slope surfaces matched with the inclined surfaces, when the fixing screw is lowered in the open slot and the expander pressing plate is gradually connected to the gamma framework, the expander ring which originally has a gap with the inner side wall of the compression cylinder 3 is in contact with the inner side wall of the compression cylinder.

[0008] Further, the centralizer assembly comprises a centralizer body and a centralizer rubber wing sleeved on the lower end of the centralizer body, the lower end of the centralizer body is designed with external threads, the centralizer body is provided with a first through hole along the axial direction, the first through hole is connected with a pressure-bearing sealing plug through an open nut, and the centralizer body is provided with an aviation socket at the lower end.

[0009] Further, the shock absorber assembly comprises a shock absorber shell, a shock absorber inner core and a rubber body, the shock absorber shell is fixed to the top end of the centralizer body, the shock absorber inner core and the shock absorber shell are filled with the rubber body, and the top end of the shock absorber inner core is connected to the bottom end of the gamma framework through a pin.

[0010] Further, the upper end surface of the shock absorber inner core is provided with a connector male head, the lower end of the gamma framework is provided with a connector female head matched with the connector male head, and the two ends of the pressure-bearing sealing plug are connected with the aviation socket and the connector male head respectively, so that the electrical conduction can be realized when the connector male head and the connector female head are connected.

[0011] Further, the power module, the main control module and the gamma counter are arranged in the gamma framework, the gamma counter is located above the power module and the main control module, the shielding body is opposite to the position of the gamma counter, the shielding body and the gamma framework are fixed through a pin, and the gamma framework is provided with a gamma pressing plate.

[0012] The upper end of the gamma framework is provided with an aviation plug, and the aviation socket, the pressure-bearing sealing plug, the connector male head, the connector female head, the main control module, the power module, the gamma counter and the aviation plug are connected through wires.

[0013] Further, the upper and lower ends of the gamma counter are provided with rubber pads and circular flat pads, the upper end of the rubber pad is provided with a hollow top rod, and the gamma framework is provided with a compression nut coaxially distributed with the hollow top rod, so that the hollow top rod and the rubber pad are pressed against each other when the compression nut moves downward along the radial direction of the hollow top rod.

[0014] Further, a plurality of sealing rings are arranged outside the gamma framework, and the sealing rings are in contact with the inner wall of the compression cylinder.

[0015] Further, the inner wall of the anti-pressure cylinder is provided with internal threads and a sealing surface at both upper and lower ends, the centralizer body is provided with external threads at the upper end, and the upper end of the centralizer body is provided with a sealing ring, the internal threads of the lower end of the anti-pressure cylinder are matched with the external threads of the upper end of the centralizer body, and the sealing surface is matched with the sealing ring.

[0016] Further, the expansion pressing plate is provided with two ear plates, and the two ear plates are provided with two cable pressing blocks which are distributed in parallel.

[0017] In conclusion, the technical effects and advantages of the utility model are as follows:

[0018] The utility model discloses an adjustable expansion device assembly, when the anti-pressure cylinder is installed, the expansion pressing plate in the expansion device can be gradually connected with the gamma skeleton by the fixing screw, and then the expansion ring with a certain gap with the inner wall of the anti-pressure cylinder can be abutted with the inner wall of the anti-pressure cylinder. The upper end of the gamma module assembly is kept in a fixed state by the expansion device assembly, and in the high-vibration and high-impact working condition of the instrument, the axial movement of the gamma module assembly can be effectively prevented, the stress load of the lower end fixing screw is reduced, and the reliability and service life of the whole instrument are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the utility model.

[0021] Figure 2 It is a shock absorber assembly structure schematic diagram of the utility model.

[0022] Figure 3 It is a three-dimensional structure schematic diagram of the utility model Figure 1 It is an enlarged structure schematic diagram of A in the utility model.

[0023] Figure 4 It is a gamma module assembly and expansion device assembly connection structure schematic diagram of the utility model.

[0024] Figure 5 It is a gamma counter and shielding body position schematic diagram of the utility model

[0025] In the figure: 11, centralizer body; 12, centralizer rubber wing; 13, open nut; 14, pressure seal plug; 15, aviation socket; 16, sealing ring; 21, shock absorber shell; 22, shock absorber inner core; 23, rubber body; 24, connector male head; 3, pressure cylinder; 41, gamma skeleton; 42, power module; 43, main control module; 44, gamma counter; 421, top rod; 422, compression nut; 423, rubber pad; 424, circular flat pad; 45, gamma pressing plate; 46, connector female head; 47, aviation plug; 48, sealing ring; 49, shielding body; 51, expansion ring; 511, open slot; 512, inclined surface; 52, expansion pressing plate; 53, cable pressing block. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] Embodiment 1: refer to Figures 1-5 The downhole azimuth gamma logging instrument shown in the figure comprises a centralizer assembly and a pressure cylinder 3 distributed from bottom to top, the pressure cylinder 3 is internally provided with a shock absorber assembly, a gamma module assembly and an expander assembly distributed from bottom to top, and the shock absorber assembly is arranged above the centralizer assembly.

[0028] The gamma module assembly comprises a gamma skeleton 41, a power module 42, a main control module 43, a gamma counter 44 and a shielding body 49 distributed in an eccentric state, and the shielding body 49 is made of high specific gravity tungsten alloy material. The shielding body 49 plays a role of shielding gamma rays and reduces the weight of the overall gamma skeleton 41.

[0029] The expander assembly comprises an expansion ring 51 and an expansion pressing plate 52 located above the expansion ring 51, the top end of the expansion pressing plate 52 is provided with an open slot 511, the open slot 511 is internally provided with a fixing screw capable of mounting the expansion pressing plate 52 on the top end of the gamma skeleton 41, the upper and lower ends of the expansion ring 51 are both provided with inclined surfaces 512, and the opposite ends of the expansion pressing plate 52 and the gamma skeleton 41 are both provided with slope surfaces matched with the inclined surfaces 512. Therefore, when the pressure cylinder 3 is not mounted on the top end of the centralizer assembly, the expansion ring 51 is located above the gamma skeleton 41, and the inclined surfaces 512 correspond to the cross section provided on the top end of the gamma skeleton 41. When the pressure cylinder 3 is mounted on the top end of the centralizer assembly, there is a gap between the expansion ring 51 and the pressure cylinder 3, so that the pressure cylinder 3 can be smoothly mounted.

[0030] After the installation of the pressure cylinder 3 is completed, the fixing screw can be controlled to be lowered inside the open slot 511, so that the expansion ring 51 which originally has a certain gap with the inner side wall of the pressure cylinder 3 abuts against the inner side wall of the pressure cylinder 3 when the expansion plate 52 gradually abuts against the gamma framework 41.

[0031] Therefore, the setting of the expander assembly can fix the upper end of the gamma module assembly, effectively prevent the axial movement of the gamma module assembly in the high-vibration and high-impact working conditions of the instrument, reduce the stress load of the lower end fixing screw, and improve the reliability and service life of the entire instrument.

[0032] The centralizer assembly includes a centralizer body 11 and a centralizer rubber wing 12 sleeved on the lower end of the centralizer body 11. The lower end of the centralizer body 11 is designed with external threads. The centralizer body 11 is provided with a first through hole along the axial direction. The first through hole is connected with a pressure sealing plug 14 through an open nut 13. An aviation socket 15 is installed on the lower end of the centralizer body 11. The aviation socket 15 can be connected with an aviation plug of the lower end instrument.

[0033] The shock absorber assembly includes a shock absorber shell 21, a shock absorber inner core 22 and a rubber body 23. The shock absorber shell 21 is fixed to the top end of the centralizer body 11. The shock absorber inner core 22 and the shock absorber shell 21 are filled with the rubber body 23. The top end of the shock absorber inner core 22 is connected with the bottom end of the gamma framework 41 through a pin. The setting of the shock absorber assembly can implement axial damping during the operation of the whole azimuthal gamma logging instrument, reduce the influence of vibration force on the operation of the instrument, and ensure the accuracy of the operation of the instrument.

[0034] Example 2: Based on example 1, as shown in Figures 1-5 The upper end surface of the shock absorber inner core 22 is provided with a connector male head 24. The lower end of the gamma framework 41 is provided with a connector female head 46 matched with the connector male head 24. The two ends of the pressure sealing plug 14 are connected with the aviation socket 15 and the connector male head 24 respectively. When the connector male head 24 and the connector female head 46 are connected, the electrical conduction can be realized.

[0035] The power module 42, the main control module 43 and the gamma counter 44 are all arranged in the gamma framework 41. The gamma counter 44 is located above the power module 42 and the main control module 43. The shielding body 49 is opposite to the position of the gamma counter 44. The shielding body 49 is fixed with the gamma framework 41 through a pin. The gamma framework 41 is provided with a gamma pressure plate 45.

[0036] The upper end of the gamma skeleton 41 is provided with an aviation plug 47, which can be connected with an aviation socket of an upper instrument, and the aviation socket 15, the pressure sealing plug 14, the connector male head 24, the connector female head 46, the master control module 43, the power module 42, the gamma counter 44 and the aviation plug 47 are connected through wires, so that the whole azimuth gamma logging instrument can be connected with an external machine in the downhole to implement a test operation.

[0037] During the operation of the whole azimuth gamma logging instrument, in order to maintain the stability of the gamma counter 44, the upper and lower ends of the gamma counter 44 are provided with rubber pads 423 and circular flat pads 424, the upper end of the rubber pad 423 is provided with a hollow top rod 421, and the gamma skeleton 41 is provided with a compression nut 422 coaxially distributed with the hollow top rod 421, when the compression nut 422 moves downward along the radial direction of the hollow top rod 421, the hollow top rod 421 and the rubber pad 423 are pressed against each other, and the gamma counter 44 is compressed. Reduce the adverse effects of instrument vibration on it, maintain the stability of the gamma counter 44 during the operation of the whole azimuth gamma logging instrument.

[0038] In order to improve the tightness and stability of the connection between the gamma skeleton 41 and the pressure-resistant cylinder 3, a plurality of sealing rings 48 are arranged outside the gamma skeleton 41, and the sealing rings 48 abut against the inner wall of the pressure-resistant cylinder 3. The arrangement of the plurality of sealing rings 48 further improves the overall shock resistance of the instrument.

[0039] The inner wall of the pressure-resistant cylinder 3 is designed with internal threads and a sealing surface at the upper and lower ends, the upper end of the centralizer body 11 is designed with external threads, and the upper end of the centralizer body 11 is designed with a sealing ring 16. The internal threads at the lower end of the pressure-resistant cylinder 3 match the external threads at the upper end of the centralizer body, and the sealing surface matches the sealing ring 16. The tightness of the connection between the centralizer assembly and the pressure-resistant cylinder 3 is ensured, and mud is effectively prevented from flowing into the interior of the pressure-resistant cylinder 3.

[0040] The expansion clamp 52 is provided with two ear plates, and the two ear plates are provided with two cable pressing blocks 53 distributed in parallel, the cable pressing blocks 53 press and fix the signal lines of the aviation plug 47, and have a protection effect on the signal lines. During long-term work of the signal lines, the phenomenon of signal line friction and fracture can be effectively avoided.

[0041] Finally, it should be noted that: the above only describes preferred embodiments of the present application, and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made within the scope of the present application shall be included in the protection scope of the present application.

Claims

1. A borehole orientation gamma ray logging instrument characterized by: It comprises a centralizer assembly and a compression cylinder (3) distributed from bottom to top, the compression cylinder (3) is provided with a shock absorber assembly, a gamma module assembly and an expander assembly distributed from bottom to top, the shock absorber assembly is arranged above the centralizer assembly; The gamma module assembly comprises a gamma skeleton (41), a power module (42), a main control module (43), a gamma counter (44) and a shielding body (49) distributed in an eccentric state; The expander assembly comprises an expander ring (51) and an expander pressing plate (52) arranged above the expander ring (51), the top end of the expander pressing plate (52) is provided with an open slot (511), the open slot (511) is provided with a fixing screw for mounting the expander pressing plate (52) on the top end of the gamma skeleton (41), the upper and lower ends of the expander ring (51) are provided with inclined surfaces (512), the opposite ends of the expander pressing plate (52) and the gamma skeleton (41) are provided with slope surfaces matched with the inclined surfaces (512), when the fixing screw is lowered in the open slot (511) and the expander pressing plate (52) is gradually connected with the gamma skeleton (41), the expander ring (51) which originally has a certain gap with the inner side wall of the compression cylinder (3) is in contact with the inner side wall of the compression cylinder (3).

2. The borehole azimuthal gamma ray logging instrument of claim 1, wherein: The centralizer assembly comprises a centralizer body (11) and a centralizer rubber wing (12) sleeved on the lower end of the centralizer body (11), the lower end of the centralizer body (11) is designed with external threads, the centralizer body (11) is provided with a first through hole along the axial direction, the first through hole is connected with a pressure sealing plug (14) through an open nut (13), and an aviation socket (15) is mounted on the lower end of the centralizer body (11).

3. The borehole directional gamma ray instrument of claim 2, wherein: The shock absorber assembly comprises a shock absorber shell (21), a shock absorber inner core (22) and a rubber body (23), the shock absorber shell (21) is fixed on the top end of the centralizer body (11), the shock absorber inner core (22) and the shock absorber shell (21) are filled with the rubber body (23), and the top end of the shock absorber inner core (22) is connected with the bottom end of the gamma skeleton (41) through a pin.

4. The borehole directional gamma ray instrument of claim 3, wherein: The upper end surface of the shock absorber inner core (22) is provided with a connector male head (24), the lower end of the gamma skeleton (41) is provided with a connector female head (46) matched with the connector male head (24), and the two ends of the pressure sealing plug (14) are connected with the aviation socket (15) and the connector male head (24), respectively, when the connector male head (24) and the connector female head (46) are connected, the electrical conduction can be realized.

5. The borehole directional gamma ray instrument of claim 4, wherein: The power module (42), the main control module (43) and the gamma counter (44) are arranged in the gamma skeleton (41), the gamma counter (44) is arranged above the power module (42) and the main control module (43), the shielding body (49) is opposite to the position of the gamma counter (44), the shielding body (49) and the gamma skeleton (41) are fixed through a pin, and the gamma skeleton (41) is provided with a gamma pressing plate (45). The upper end of the gamma skeleton (41) is provided with an aviation plug (47), and the aviation socket (15), the pressure-sealed plug (14), the connector male head (24), the connector female head (46), the master control module (43), the power module (42), the gamma counter (44) and the aviation plug (47) are connected through wires.

6. The borehole directional gamma ray instrument of claim 5, wherein: The upper and lower ends of the gamma counter (44) are provided with rubber pads (423) and circular flat pads (424), the upper end of the rubber pad (423) is provided with a hollow top rod (421), and the gamma skeleton (41) is provided with a compression nut (422) coaxially distributed with the hollow top rod (421), when the compression nut (422) moves downward along the radial direction of the hollow top rod (421), the hollow top rod (421) and the rubber pad (423) can be extruded.

7. The borehole directional gamma ray instrument of claim 5, wherein: The gamma skeleton (41) is provided with multiple sealing rings (48) outside, and the sealing rings (48) abut against the inner wall of the pressure-resistant cylinder (3).

8. The borehole azimuthal gamma ray instrument of claim 2, wherein: The inner wall of the pressure-resistant cylinder (3) is designed with internal threads and a sealing surface at the upper and lower ends, the upper end of the centralizer body (11) is provided with external threads, and the upper end of the centralizer body (11) is provided with a sealing ring (16), the internal threads at the lower end of the pressure-resistant cylinder (3) are matched with the external threads at the upper end of the centralizer body (11), and the sealing surface is matched with the sealing ring (16).

9. The borehole orientation gamma ray instrument of claim 1, wherein: The expansion pressing plate (52) is provided with two ear plates, and the two ear plates are provided with two cable pressing blocks (53) distributed in parallel, and the cable pressing blocks (53) tightly fix the signal lines of the aviation plug (47).

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