Communication switching short section of logging-while-drilling instrument

Abstract

The utility model belongs to the technical field of logging-while-drilling instruments, and discloses a communication adapter nipple of a logging-while-drilling instrument, which comprises a hollow mounting cylinder, a communication circuit board mounting seat positioned in the mounting cylinder and an adapter sleeve positioned on one side, close to a drill bit, of the mounting cylinder, and the adapter sleeve is inserted into the mounting cylinder and fixedly connected with the communication circuit board mounting seat. The communication circuit board mounting seat is cylindrical on the whole, and a communication circuit board mounting part is arranged in the middle; a single-core connecting assembly is arranged in the reducing sleeve, a communication circuit board is fixedly installed on the communication circuit board installation base, the side, close to the reducing sleeve, of the communication circuit board is connected with the single-core connecting assembly through a single-core wire, and the side, away from the reducing sleeve, of the communication circuit board is connected with a multi-core aviation plug connector through a multi-core wire. The drill collar is simple in structure, convenient to assemble and disassemble during maintenance, high in universality and suitable for design of drill collars of different structures.

Description

Technical Field

[0001] This utility model belongs to the field of logging-while-drilling instrument technology, specifically relating to a communication adapter short for logging-while-drilling instruments. Background Technology

[0002] In the modern oil and gas industry, logging-while-drilling (LWD) technology is widely used because it can acquire underground geological information in real time. By integrating various sensors and data acquisition devices inside the drill collar, LWD technology can simultaneously monitor formation parameters, such as rock properties and fluid characteristics, during drilling, thus providing crucial support for optimizing the drilling path and improving oil recovery.

[0003] In practical applications, logging-while-drilling instruments typically need to integrate multiple communication interfaces to meet the data exchange requirements between different sensing devices. However, the harsh downhole environment (such as high temperature, high pressure, strong vibration, and corrosive media) places higher demands on the reliability, real-time performance, and compatibility of data transmission. Existing communication conversion equipment often suffers from insufficient reliability, complex installation, poor compatibility, and a lack of versatility. Utility Model Content

[0004] To address this, this invention proposes a communication adapter for logging-while-drilling instruments, which not only adapts to the requirements of harsh downhole environments and improves the compatibility and reliability of logging-while-drilling instrument systems, but also simplifies installation and maintenance procedures, providing strong technical support for modern drilling operations.

[0005] This utility model protects a communication adapter short section for logging-while-drilling instruments, including a hollow mounting cylinder, a communication circuit board mounting base located inside the mounting cylinder, and an adapter sleeve located on the side of the mounting cylinder near the drill bit. The adapter sleeve is inserted into the mounting cylinder and fixedly connected to the communication circuit board mounting base.

[0006] The communication circuit board mounting base is cylindrical in shape, with a first wire outlet hole and a second wire outlet hole at each end, and the middle part is the communication circuit board mounting part; the communication circuit board mounting part has a planar structure, with arc-shaped protrusions on both sides for protection.

[0007] The adapter sleeve has a single-core connection component inside. The end of the single-core connection component away from the communication circuit board mounting base is threaded with a single-core pin, and the end closer to the communication circuit board mounting base is inserted into its second outlet hole, achieving a tight connection through the thread.

[0008] A communication circuit board is fixedly mounted on the communication circuit board mounting base. The side of the communication circuit board closer to the adapter sleeve is connected to a single-core connection component via a single-core wire, and the side farther from the adapter sleeve is connected to a multi-core aviation connector via a multi-core wire.

[0009] The mounting cylinder has internal threads at both ends for connecting multi-core wire connection equipment and single-core wire connection equipment. The multi-core wire connection equipment includes an electromagnetic wave resistivity meter, a drilling nuclear magnetic resonance meter, and an upper gamma ray detector. The single-core wire connection equipment includes a drilling azimuth meter, a drilling inclination meter, and a lower gamma ray detector.

[0010] As a preferred option, the end of the adapter sleeve near the communication circuit board mounting base has a stepped structure, with the stepped end inserted into the mounting cylinder and fixedly connected to the communication circuit board mounting base.

[0011] As a preferred option, a sealing groove is provided on the outer periphery of the stage, and an O-ring is embedded in the sealing groove. During the installation of the cylinder, the O-ring is compressed to achieve a fixed connection between the adapter sleeve and the installation cylinder.

[0012] As a preferred embodiment, a sealing groove is provided on the outer periphery of the single-core connecting component, and an O-ring is embedded in the sealing groove. During the fitting of the adapter sleeve, the O-ring is compressed to achieve a fixed connection between the single-core connecting component and the adapter sleeve.

[0013] As a preferred option, the outer periphery of both ends of the communication circuit board mounting base is provided with sealing grooves, and O-rings are embedded in the sealing grooves. During the installation of the mounting cylinder, the O-rings are squeezed to achieve a fixed connection between the communication circuit board mounting base (2) and the mounting cylinder.

[0014] As a preferred embodiment, the communication circuit board is divided into two parts, which are fixed on two planes of the communication circuit board mounting part respectively.

[0015] As a preferred option, a PEek material spacer is placed under the communication circuit board.

[0016] As a preferred option, clearance grooves are provided at both ends of the communication circuit board mounting section.

[0017] This utility model also protects a logging-while-drilling instrument, including the aforementioned logging-while-drilling instrument communication adapter sub and a multi-core wire connection device and a single-core wire connection device located on both sides thereon, wherein the single-core wire connection device is located on the side closer to the drill bit, and the multi-core connection device is located on the side farther away from the drill bit.

[0018] This invention distributes the sensing devices in the logging-while-drilling instrument as single-core and multi-core on both sides of the communication adapter sub. The entire sub has a simple structure, is easy to assemble and disassemble during maintenance, and has strong versatility, making it suitable for drill collar designs with different structures. The gamma ray detectors are set at different positions on the drill string to achieve different functional focuses. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the internal structure of the logging-while-drilling instrument communication adapter sub disclosed in Example 1;

[0020] Figure 2 This is a three-dimensional structural schematic diagram of the communication circuit board mounting base disclosed in Embodiment 1;

[0021] Figure 3 This is a cross-sectional view of the internal structure of the communication circuit board mounting base disclosed in Embodiment 1;

[0022] Figure 4 This is a three-dimensional structural diagram of the adapter sleeve disclosed in Example 1;

[0023] Figure 5 This is a cross-sectional view of the internal structure of the adapter sleeve disclosed in Example 1;

[0024] Figure 6 The internal structure cross-sectional view of the single-core connection component is disclosed in Embodiment 1. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0026] Example 1

[0027] A communication adapter for logging-while-drilling instruments, such as Figure 1-3 As shown, it includes a hollow mounting cylinder 1, a communication circuit board mounting base 2 located inside the mounting cylinder 1, and an adapter sleeve 3 located on the side of the mounting cylinder 1 near the drill bit. The adapter sleeve 3 is inserted into the mounting cylinder 1 and is fixedly connected to the communication circuit board mounting base 2.

[0028] See Figure 2 , Figure 3 The communication circuit board mounting base 2 is cylindrical in shape, with a first cable outlet hole 21 and a second cable outlet hole 22 at each end, and a communication circuit board mounting part 23 in the middle. The communication circuit board mounting part 23 has a planar structure with arc-shaped protrusions 24 on both sides. Since the circuit board has a certain thickness and various components are arranged on it, the arc-shaped protrusions 24 can protect the circuit board and the components on it.

[0029] The communication circuit board mounting section 23 is preferably located at the point of maximum space, i.e., along the axis of the communication circuit board mounting base 2, thereby providing a larger space for circuit board installation. The communication circuit board mounting section has a planar structure, providing mounting positions for circuit boards on both sides. Therefore, during circuit design, the communication circuit can be divided into two circuit boards, which are respectively fixed to both sides of the communication circuit board mounting section 23. (See [reference]). Figure 3 .

[0030] The adapter sleeve 3 has a single-core connecting component 4 inside. The end of the single-core connecting component 4 away from the communication circuit board mounting base 2 is threaded with a single-core pin 41 (see...). Figure 6 ), and insert it into its second outlet hole 22 at the end near the communication circuit board mounting base 2 (see Figure 1 The other end is provided with an external thread 42, and the end with the external thread 42 extends out of the adapter sleeve 3 and is threadedly connected to the second outlet hole 22 with an internal thread.

[0031] To ensure a secure connection between the single-core connecting assembly 4 and the adapter sleeve 3, the outer periphery of the single-core connecting assembly 4 is provided with multiple sealing grooves 43, see [link to documentation]. Figure 4 The sealing groove 43 is fitted with an O-ring 44. During the fitting of the adapter sleeve 3, the O-ring 44 is compressed, thus achieving a stable connection between the single-core connecting component 4 and the adapter sleeve 3.

[0032] Similarly, sealing grooves 25 are provided on the outer periphery of both ends of the communication circuit board mounting base 2, and O-rings 26 are embedded in the sealing grooves 25. During the installation of the mounting cylinder 1, the O-rings 26 are squeezed to achieve a stable connection between the communication circuit board mounting base 2 and the mounting cylinder 1.

[0033] A communication circuit board 5 is fixedly mounted on the communication circuit board mounting section 23, see [reference]. Figure 1 , Figure 3 In this embodiment, the fixing method is threaded fixing. Multiple threaded holes 27 are provided on the communication circuit board mounting part 23, and the communication circuit board 5 is fixed to the communication circuit board mounting part 23 by screws. To avoid excessive pressure from the mounting screws on the circuit board, which could lead to localized damage, this embodiment provides PEek material spacers on both sides of the communication circuit board mounting part 23. PEek material has excellent high-temperature resistance, electrical insulation, high strength, and high rigidity, which can improve the reliability of the circuit board mounting.

[0034] To improve the tightness and reliability of the connection between the communication circuit board mounting base 2 and the adapter sleeve 3, the end of the adapter sleeve 3 closest to the communication circuit board mounting base 2 has a stepped structure, see [link / reference]. Figure 5 In stage 31, the mounting cylinder 1 is inserted and fixedly connected to the communication circuit board mounting base 2. See [reference needed]. Figure 1Preferably, a sealing groove 32 is provided on the outer periphery of the stage 31, and an O-ring 33 is embedded in the sealing groove 32. During the installation of the cylinder 1, the O-ring 33 is compressed to achieve a stable connection between the adapter sleeve 3 and the installation cylinder 1.

[0035] Based on data transmission methods and functional requirements, the sensing devices in logging-while-drilling (LoWWL) instruments are mainly divided into two categories: single-core wire connection devices and multi-core wire connection devices. Single-core wire connection devices achieve data transmission through a single wire (usually a dedicated cable inside the drill string or mud pulse transmission). While the data transmission rate is relatively low, the structure is simple and the cost is low. Sensors used primarily handle parameters requiring low power consumption and high real-time performance. Multi-core wire connection devices achieve high-speed data transmission through multi-core cables or optical fibers, can accommodate more sensors, and are suitable for high-resolution, multi-parameter measurement scenarios.

[0036] Gamma-ray detectors play a crucial role in MWD systems, primarily used to acquire real-time information on the natural radioactivity of the formation, thereby assisting in geological assessment and drilling decisions. However, gamma-ray detectors located in different positions can have different focuses, which will be discussed below in the context of upper gamma-ray detectors and lower gamma-ray detectors.

[0037] The upper gamma ray detector, as the name suggests, is installed at a higher position on the drill string, a certain distance above the drill bit. This position is chosen to avoid interference signals generated when the drill bit is working, while also being able to better reflect the characteristics of the upper formation. The lower gamma ray detector is installed closer to the drill bit, usually in or near the short section behind the drill bit. This layout allows it to monitor the gamma ray intensity of the formation directly in front of the drill bit in real time.

[0038] Upper and lower gamma ray detectors can use the same detector technology, such as scintillation crystals (e.g., NaI(Tl)) or semiconductor detectors (e.g., HPGe), but the detector sensitivity, dynamic range, etc., may be adjusted to adapt to different measurement environments and requirements. Because the lower gamma ray detector is closer to the drill bit, its packaging needs to take special consideration into account the effects of high temperature, high pressure, and mechanical shock, and more robust and durable materials and designs can be used.

[0039] Upper gamma-ray detectors can be set to lower sensitivity to reduce interference from fluids within the wellbore and other non-formation factors, while lower gamma-ray detectors may have higher sensitivity to capture weak formation signals. Given that lower gamma-ray detectors are closer to the drill bit, their sampling frequency is typically higher to ensure real-time data accuracy.

[0040] Based on the above setup, the upper gamma ray detector is mainly used to measure the intensity of natural gamma rays in the formation above the drill string, helping to determine the lithology and radioactivity characteristics of the formation, and is connected using a multi-core wire; the lower gamma ray detector focuses on measuring the intensity of gamma rays in the formation in front of the drill bit, providing information about the formation to be encountered, which helps to optimize drilling parameters and geological guidance, and can be connected using a single-core wire.

[0041] To save space and facilitate the layout design within the drill collar, this embodiment places the multi-core wire connection device on one side of the communication adapter sub (away from the drill bit), and the single-core wire connection device on the other side of the communication adapter sub (closer to the drill bit). Both sides are connected to the communication circuit board 5 of the communication adapter sub. Therefore, the side of the communication circuit board 5 closest to the adapter sleeve 3 is connected to the single-core connection assembly 4 via a single-core wire, and the side furthest from the adapter sleeve 3 is connected to the multi-core aviation connector 6 via a multi-core wire. See [reference needed]. Figure 1 The devices on both sides are connected to the communication circuit board 5 via a single-core connection assembly 4 and a multi-core aviation connector 6, respectively. The mounting cylinder 1 has internal threads at both ends for connecting the multi-core wire connection device and the single-core wire connection device. The multi-core wire connection device includes an electromagnetic resistivity meter, a drilling-while-drilling nuclear magnetic resonance spectrometer, and an upper gamma-ray detector. The single-core wire connection device includes a drilling-while-drilling azimuth meter, a drilling-while-drilling inclination meter, and a lower gamma-ray detector.

[0042] The mounting cylinder 1 and the adapter sleeve 3 can be made of non-magnetic, highly corrosion-resistant nickel alloy material. To match the multi-core wire connection equipment and single-core wire connection equipment on both sides, their end face diameters are not identical, matching the dimensions of the upper and lower instruments respectively. The two diameter mating points correspond to the stage 21 of the adapter sleeve 3, smoothly transitioning through a small-angle bevel (see...). Figure 1 This allows the mud to flow freely across its outer surface, reducing the concentration points of erosion stress.

[0043] To facilitate wiring, clearance grooves 28 are provided at both ends of the communication circuit board mounting section 23. Preferably, the clearance grooves 28 are provided at both ends. Figure 2 The U-shaped hole structure shown ensures a large opening while avoiding interference with the second cable outlet hole 22. The end faces of the communication circuit board mounting base 2 and the adapter sleeve 3, respectively, are provided with threaded holes 29 and 34, see [reference needed]. Figure 2 , Figure 4 The two are fixed together by screws.

[0044] To ensure the stability of the multi-core connector, tail clips 7 are provided at the ends of the multi-core aviation connector 6 and the communication circuit board mounting base 2, respectively.

[0045] Example 2

[0046] A logging-while-drilling instrument includes the aforementioned logging-while-drilling instrument communication adapter sub and multi-core wire connection devices and single-core wire connection devices located on both sides thereon, wherein the single-core wire connection devices are located on the side closer to the drill bit, and the multi-core connection devices are located on the side farther from the drill bit.

[0047] Multi-core wire connection equipment includes electromagnetic wave resistivity meter, drilling nuclear magnetic resonance meter, and upper gamma ray detector, while single-core wire connection equipment includes drilling azimuth meter, drilling dip meter, and lower gamma ray detector.

[0048] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art or related fields based on the embodiments of this utility model without inventive effort should fall within the scope of protection of this utility model.

Claims

1. A communication adapter for logging-while-drilling instruments, characterized in that, Includes a hollow mounting cylinder (1), a communication circuit board mounting base (2) located inside the mounting cylinder (1), and an adapter sleeve (3) located on the side of the mounting cylinder (1) near the drill bit. The adapter sleeve (3) is inserted into the mounting cylinder (1) and fixedly connected to the communication circuit board mounting base (2). The communication circuit board mounting base (2) is cylindrical in shape, with a first wire outlet hole (21) and a second wire outlet hole (22) at both ends, and a communication circuit board mounting part (23) in the middle; the communication circuit board mounting part (23) is a planar structure, with arc-shaped protrusions (24) on both sides for its protective function. The adapter sleeve (3) is equipped with a single-core connection component (4). The single-core connection component (4) is threaded to a single-core pin (41) at one end away from the communication circuit board mounting base (2), and the other end near the communication circuit board mounting base (2) is inserted into its second outlet hole (22) to achieve a tight connection through the thread. A communication circuit board (5) is fixedly installed on the communication circuit board mounting base (2). The side of the communication circuit board (5) close to the adapter sleeve (3) is connected to the single-core connection component (4) through a single-core wire, and the side away from the adapter sleeve (3) is connected to the multi-core aviation connector (6) through a multi-core wire. The mounting cylinder (1) has internal threads at both ends for connecting multi-core wire connection equipment and single-core wire connection equipment. The multi-core wire connection equipment includes an electromagnetic wave resistivity meter, a drilling nuclear magnetic resonance meter, and an upper gamma ray detector. The single-core wire connection equipment includes a drilling azimuth meter, a drilling inclination meter, and a lower gamma ray detector.

2. The logging-while-drilling instrument communication adapter sub according to claim 1, characterized in that, The adapter sleeve (3) has a stepped structure at one end near the communication circuit board mounting base (2). The stepped end (31) is inserted into the mounting cylinder (1) and fixedly connected to the communication circuit board mounting base (2).

3. The logging-while-drilling instrument communication adapter sub according to claim 2, characterized in that, A sealing groove is provided on the outer periphery of the stage (31), and an O-ring is embedded in the sealing groove. During the installation of the cylinder (1), the O-ring is squeezed to achieve a fixed connection between the adapter sleeve (3) and the installation cylinder (1).

4. The logging-while-drilling instrument communication adapter sub according to claim 1, characterized in that, The single-core connecting component (4) has a sealing groove on its outer periphery, and an O-ring is embedded in the sealing groove. During the fitting of the adapter sleeve (3), the O-ring is squeezed to achieve a fixed connection between the single-core connecting component (4) and the adapter sleeve (3).

5. The logging-while-drilling instrument communication adapter sub according to claim 1, characterized in that, The communication circuit board mounting base (2) has sealing grooves on the outer periphery of both ends. O-rings are embedded in the sealing grooves. During the installation of the mounting cylinder (1), the O-rings are squeezed to achieve a fixed connection between the communication circuit board mounting base (2) and the mounting cylinder (1).

6. The logging-while-drilling instrument communication adapter sub according to claim 1, characterized in that, The communication circuit board (5) is divided into two parts, which are fixed on the two planes of the communication circuit board mounting part (23).

7. The logging-while-drilling instrument communication adapter sub according to claim 6, characterized in that, A PEek material spacer is provided under the communication circuit board (5).

8. The logging-while-drilling instrument communication adapter sub according to claim 6, characterized in that, The communication circuit board mounting section (23) has clearance grooves (27) at both ends.

9. The logging-while-drilling instrument communication adapter sub according to claim 1, characterized in that, The ends of the multi-core aviation connector (6) and the communication circuit board mounting base (2) are respectively provided with tail clips (7) for fixing the multi-core connecting wires.

10. A logging-while-drilling instrument, characterized in that, It includes the logging-while-drilling instrument communication adapter sub as described in any one of claims 1-9, and a multi-core wire connection device and a single-core wire connection device located on both sides thereon, wherein the single-core wire connection device is located on the side closer to the drill bit, and the multi-core connection device is located on the side farther from the drill bit.

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