A measurement-while-drilling collar

Abstract

The utility model discloses a kind of measurement drill collars with while drilling, belong to petroleum drilling technical field, including measurement drill collars with while drilling main body, carrier being set to the passage inside main body, and pressure gauge carrier welding of the both sealing fixation, front end is provided with the detachable drill collar sealing cover blocking impurity, inside is provided with flow guiding centralizer carding drilling fluid flow state, and by drainage pin, drilling fluid is directed to measuring element, and compacting centralizing ring is used for fixing internal component, socket fixing nut is used for locking signal socket to resist strong vibration. The utility model solves the technical problem that measuring element is susceptible to interference in downhole harsh environment, leading to inaccurate measurement, unstable signal, effectively protects measuring element, significantly improves the accuracy of data acquisition and the reliability of signal transmission.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology, and in particular to a measurement-while-drilling drill collar. Background Technology

[0002] Measurement while drilling (MSWL) is one of the key technologies in modern drilling engineering. It enables real-time monitoring of downhole temperature and pressure engineering parameters by installing measuring instruments in the drill string assembly. As a key component that carries these precision measuring instruments, the performance of the MSWL drill collar directly affects the safety and efficiency of drilling operations. The working environment of the MSWL drill collar is extremely harsh. Downhole conditions include high temperature and high pressure, drilling fluid containing a large amount of rock cuttings and solid particles, which are in a high-speed flow state during circulation. The drill string generates severe vibrations and impacts during rotation and drilling. These factors together pose a severe challenge to the precision measuring elements installed inside the drill collar.

[0003] While some existing measurement-while-drilling (MWD) drill collars are equipped with protective structures, they often struggle to fully cope with the aforementioned complex and harsh environments. Their sealing structures may not be sufficient to completely prevent the intrusion of fine particles, leading to sensor wear and failure. Alternatively, their internal flow channel design may fail to effectively manage the drilling fluid flow, allowing high-speed turbulent flow to directly impact the sensor, resulting in high noise and data distortion in the measurement signal. Furthermore, under strong vibrations, the fixation and connection of internal components are prone to loosening, leading to signal transmission interruption. Existing designs fail to achieve synergy in terms of effective sealing, stable flow field, and vibration-resistant fixation, thus affecting the accuracy and reliability of downhole data acquisition.

[0004] Therefore, this utility model proposes a measurement-while-drilling drill collar to address the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems in the prior art, where the internal measuring elements of a measurement-while-drilling drill collar are easily interfered with in the high temperature, high pressure, strong vibration and drilling fluid containing impurities downhole, resulting in inaccurate measurement data, unstable signal transmission and easy damage to the equipment, this utility model aims to provide a measurement-while-drilling drill collar with an improved structure that can effectively solve the above problems.

[0006] This utility model provides a measurement-while-drilling (MSD) drill collar, comprising: a main body of the MSD drill collar, a carrier, and a pressure gauge carrier welded together; it also includes a drill collar sealing cover, a flow guide stabilizer, and a flow guide pin.

[0007] The measurement-while-drilling (MWD) drill collar body has an internal channel for the flow of drilling fluid. The carrier is set in the internal channel, and the pressure gauge carrier is welded around the outer periphery of the carrier to achieve a sealed and fixed connection between the carrier and the MWD drill collar body.

[0008] Furthermore, the drill collar sealing cap is detachably and sealingly connected to one end opening of the measurement-while-drilling drill collar body, the flow guide stabilizer is fixed in the internal channel and located on the drilling fluid inflow side of the carrier, and the guide pin is fixed on or near the carrier. These components form a complete collaborative protection and guidance system by sealing the front opening of the equipment and by channeling and precisely guiding the inflowing drilling fluid.

[0009] Preferably, the measurement-while-drilling drill collar further includes a clamping and centering ring, which is disposed in the internal channel and located between the drill collar sealing cover and the carrier, for clamping and fixing the internal components. In a more specific embodiment, the outer peripheral wall of the clamping and centering ring is in contact with the inner wall of the internal channel to help center the main body of the measurement-while-drilling drill collar and enhance its stability downhole.

[0010] Preferably, the measurement-while-drilling collar further includes a pressure sensor housing, which is mounted on the carrier to provide physical protection for the internal pressure sensor. Furthermore, a guide pin is located at the front end of the pressure sensor housing, its function being to guide drilling fluid to the sensing surface of the pressure sensor housing, ensuring that the sensor can capture accurate fluid pressure signals.

[0011] Preferably, the flow guide stabilizer has a centralizing rib on its outer periphery and a flow guide hole in its center. This structural design not only enhances the centering stability of the drill collar, but also effectively regulates the flow of drilling fluid, allowing it to flow smoothly to the subsequent measuring elements.

[0012] Preferably, the measurement-while-drilling (MWD) drill collar further includes a socket fixing nut, which is threadedly connected to the signal output end of the MWD drill collar body to lock the signal socket and effectively prevent signal connection loosening or interruption caused by severe downhole vibration. Furthermore, the socket fixing nut is located on the same side or adjacent to the drill collar sealing cover, making assembly and maintenance operations more convenient.

[0013] Preferably, the measurement-while-drilling collar also includes a screw plug, which is connected by a thread to seal the inspection port opened on the body of the measurement-while-drilling collar or the carrier, ensuring the equipment's airtightness while providing a convenient access for future maintenance and repair work.

[0014] Preferably, the overall structure of the carrier is designed to provide a stable working environment for the pressure gauge, thus ensuring that the internal measurement module is not affected by external electromagnetic or physical vibrations and ensuring the reliability of the measurement results.

[0015] This utility model has the following beneficial effects:

[0016] 1. This utility model solves the problem in the prior art that the measuring elements of the drill collar in the complex downhole environment are easily affected by impurities, fluid impact and vibration interference, resulting in inaccurate measurement data and unstable signal transmission. It solves the problem by setting up a drill collar sealing cover, a flow guide stabilizer, a flow guide pin and a pressure gauge carrier welding multiple protection and guidance structures. It achieves the technical effect of effectively protecting the internal measuring elements and ensuring accurate measurement data and stable signal transmission.

[0017] 2. This utility model solves the problem of signal sockets easily loosening and causing signal interruption or instability in strong vibration environments underground by setting a socket fixing nut to lock the signal socket, thus achieving the technical effect of ensuring that the measurement signal can be transmitted safely and reliably.

[0018] 3. This utility model, by setting a clamping and straightening ring, welding the pressure gauge carrier, and using screw plugs, solves the problems of loose internal component fixing, poor overall sealing, and difficulty in equipment maintenance in the prior art, and achieves the technical effect of enhancing the structural stability and sealing reliability of the equipment, while providing a convenient access point for maintenance. Attached Figure Description

[0019] Figure 1 This is one of the partial structural schematic diagrams of a measurement-while-drilling drill collar proposed in this utility model;

[0020] Figure 2 This is the second partial structural schematic diagram of a measurement-while-drilling drill collar proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of a drilling collar for measurement while drilling proposed in this utility model.

[0022] Legend:

[0023] 1. Socket fixing nut; 2. Drill collar sealing cover; 3. Tightening and centralizing ring; 4. Drainage pin; 5. Pressure gauge carrier welding; 6. Measurement while drilling drill collar; 7. Pressure sensor housing; 8. Screw plug; 9. Carrier; 10. Drainage centralizer. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Example:

[0026] Please refer to Figures 1 to 3This utility model embodiment provides a measurement-while-drilling (MWD) drill collar, including a main body of the MWD drill collar 6 and a carrier 9 disposed in an internal channel of the main body of the MWD drill collar 6. The main body of the MWD drill collar 6 serves as the main frame of the equipment, has an internal channel for the flow of drilling fluid, provides an installation foundation for internal components, and bears drilling loads. A pressure gauge carrier weld 5 surrounds the outer periphery of the carrier 9 and achieves a sealed and fixed connection between the carrier 9 and the main body of the MWD drill collar 6. The carrier 9 is used to provide a stable working environment that isolates interference for the internal pressure gauge measurement module.

[0027] Please refer to Figure 2 and Figure 3 The flow guide stabilizer 10 is fixed in the internal channel of the main body of the drilling collar 6 for measurement while drilling. The flow guide stabilizer 10 is located on the drilling fluid inflow side of the carrier 9. The flow guide stabilizer 10 is used to regulate the flow state of the drilling fluid and assist in correcting the deviation of the drill collar.

[0028] The guide pin 4 is fixed on or near the carrier 9. The guide pin 4 is used to further guide the drilling fluid to flow in a directional direction to the measuring element installed on the carrier 9, based on the combing of the guide and centralizer 10.

[0029] The drill collar sealing cover 2 is detachably and sealingly connected to one end opening of the main body of the measurement-while-drilling drill collar 6. The drill collar sealing cover 2 is used to prevent impurities from entering and maintain the internal sealed environment protection element.

[0030] This structure, which combines fluid guidance with physical sealing, ensures that the measuring element is protected from fluid turbulence and impurity intrusion, thereby improving measurement accuracy and equipment reliability.

[0031] As a preferred embodiment, in order to enhance the stability of the internal components and the centering effect of the drill collar, a clamping and centering ring 3 is also included. The clamping and centering ring 3 is disposed in the internal channel and located between the drill collar sealing cover 2 and the carrier 9, for fixing the internal components; more specifically, the outer peripheral wall of the clamping and centering ring 3 is in contact with the inner wall of the internal channel to help the main body of the drill collar 6 for measurement while drilling remain centered in the wellbore.

[0032] As another preferred embodiment, in order to effectively protect the internal sensor, a pressure sensor housing 7 is also included. The pressure sensor housing 7 is mounted on the carrier 9 and is used to protect the pressure sensor. In order to further ensure the accuracy of the measurement data, a guide pin 4 is provided at the front end of the pressure sensor housing 7 and is used to guide the drilling fluid to the sensing surface of the pressure sensor housing 7 to avoid measurement errors caused by fluid turbulence.

[0033] In one specific embodiment, to optimize the function of the flow guide centralizer 10, a centralizing rib is provided on the outer periphery of the flow guide centralizer 10, and a flow guide hole is provided in the center of it. The centralizing rib enhances the centering ability of the drill collar, while the flow guide hole allows the drilling fluid to flow smoothly to the subsequent measuring elements.

[0034] As an implementation method to ensure stable signal transmission, it also includes a socket fixing nut 1, which is threadedly connected to the signal output end of the main body of the drilling collar 6 for measurement while drilling, and is used to lock the signal socket to prevent it from loosening in the strong vibration environment downhole; preferably, the socket fixing nut 1 is located on the same side or adjacent to the drilling collar sealing cover 2 for easy assembly and maintenance.

[0035] As an implementation method that facilitates equipment maintenance, it also includes a screw plug 8, which is connected by threads to seal the inspection port opened on the main body of the measurement-while-drilling drill collar 6 or the carrier 9, providing a convenient access for equipment maintenance.

[0036] Specifically, the overall structure of the carrier 9 is designed to provide the pressure gauge with a stable working environment that isolates it from interference.

[0037] Working principle: During drilling operations, drilling fluid carrying downhole pressure and temperature information flows into the internal channels of the main body of the measurement-while-drilling (MWD) drill collar 6. The drilling fluid first flows through the flow stabilizer 10, with the outer circumferential ribs of the flow stabilizer 10 assisting the drill collar in the center, and its central flow hole initially clearing the drilling fluid. At the same time, the drill collar sealing cap 2, located at the front end, is detachably sealed to one end opening of the MWD drill collar 6 main body, preventing rock cuttings and impurities from entering the equipment.

[0038] After being combed, the drilling fluid continues to flow to the guide pin 4, which is fixed on or near the carrier 9 and located at the front end of the pressure sensor housing 7. The guide pin 4 directs the drilling fluid to the sensing surface of the pressure sensor housing 7. The pressure sensor installed inside the pressure sensor housing 7 captures the pressure change and converts it into an electrical signal. The signal is transmitted to the pressure gauge measurement module inside the carrier 9. The carrier 9 provides a stable working environment for the measurement module to isolate interference.

[0039] Throughout the process, the pressure gauge carrier welding 5 surrounds the outer periphery of the carrier 9, achieving a sealed and fixed connection between the carrier 9 and the main body of the measurement-while-drilling (MWD) drill collar 6, preventing drilling fluid leakage. The clamping and centering ring 3 is located between the drill collar sealing cover 2 and the carrier 9, clamping and fixing the internal components and assisting in centering the drill collar to resist vibration. The socket fixing nut 1 is threadedly connected to the signal output end, locking the signal socket and ensuring stable signal transmission under strong vibration. The screw plug 8 seals the inspection port via a threaded connection for subsequent maintenance. Through the synergistic effect of the above components, this invention solves the problems of inaccurate measurement and unstable signal in harsh downhole environments.

Claims

1. A measurement-while-drilling drill collar, comprising: The main body of the measurement-while-drilling drill collar (6) has an internal channel for the flow of drilling fluid; Carrier (9), the carrier (9) is disposed in the internal channel; Pressure gauge carrier welding (5) surrounds the outer periphery of the carrier (9) and achieves a sealed and fixed connection between the carrier (9) and the main body of the measurement while drilling drill collar (6). The feature is that the measurement-while-drilling drill collar further includes: a drill collar sealing cover (2), which is detachably and sealingly connected to one end opening of the main body of the measurement-while-drilling drill collar (6); A flow guide stabilizer (10) is fixed in the internal channel and located on the drilling fluid inflow side of the carrier (9); A guide pin (4) is fixed on or near the carrier (9) and is used to guide the drilling fluid to flow in a directional direction toward the measuring element.

2. The measurement-while-drilling collar according to claim 1, characterized in that, It also includes a clamping and straightening ring (3), which is disposed in the internal channel and located between the drill collar sealing cover (2) and the carrier (9) for fixing internal components.

3. A measurement-while-drilling drill collar according to claim 2, characterized in that, The outer peripheral wall of the clamping and centering ring (3) is close to the inner wall of the internal channel to help the main body of the measuring drill collar (6) be centered.

4. A measurement-while-drilling collar according to claim 1, characterized in that, It also includes a pressure sensor housing (7), which is mounted on the carrier (9) for protecting the pressure sensor.

5. A measurement-while-drilling drill collar according to claim 4, characterized in that, The guide pin (4) is located at the front end of the pressure sensor housing (7) and is used to guide the drilling fluid to the sensing surface of the pressure sensor housing (7).

6. A measurement-while-drilling drill collar according to claim 1, characterized in that, It also includes a screw plug (8), which is connected by a thread to seal the inspection port opened on the body of the measuring drill collar (6) or the carrier (9).

7. A measurement-while-drilling drill collar according to claim 1, characterized in that, It also includes a socket fixing nut (1), which is threaded to the signal output end of the main body of the measurement while drilling (6) and is used to lock the signal socket.

8. A measurement-while-drilling drill collar according to claim 7, characterized in that, The socket fixing nut (1) is located on the same side or adjacent to the drill collar sealing cover (2).

9. A measurement-while-drilling drill collar according to claim 1, characterized in that, The outer periphery of the flow guide and stabilizer (10) is provided with a stabilizing rib, and the center of the flow guide and stabilizer (10) is provided with a flow guide hole.

10. A measurement-while-drilling drill collar according to claim 1, characterized in that, The carrier (9) provides a stable working environment for the pressure gauge to isolate interference.

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