Downhole operation while drilling measurement device

Abstract

The application discloses a downhole operation while drilling measurement device and relates to the technical field of geological exploration. The downhole operation while drilling measurement device comprises a mandrel pipe body with an axis, an impeller driving mechanism, a plugging mechanism and a valve seat which are sequentially arranged from bottom to top in the mandrel pipe body. The valve seat has a flow passage, the plugging mechanism can move up and down relative to the valve seat, and the impeller driving mechanism can drive the plugging mechanism to move upwards to make the plugging mechanism block the flow passage when fluid flows upwards. When the valve seat is blocked by the plugging mechanism, the upper and lower parts of the valve seat in the mandrel pipe body are disconnected, and the plugging mechanism can move downwards under the action of gravity to make the plugging mechanism separate from the flow passage of the valve seat. The application can reduce power consumption under the premise of ensuring that the operation is not affected, thereby prolonging the detection depth.

Description

Technical Field

[0001] This invention relates to the field of geological exploration technology, and in particular to a downhole measurement while drilling device. Background Technology

[0002] In the field of geological exploration, especially in oil and gas exploration, measurement while drilling (MSW) technology is often used. This involves installing an MSW device behind the drill bit to measure the geological parameters of the formations around the drill bit in real time. This allows for the identification of complex oil and gas layers with industrial exploitation value, enabling the drill bit to stop in the desired reservoir in a timely manner. At the same time, the MSW device monitors the position of the drill bit, drilling trajectory, well inclination, well diameter, and vibration parameters to achieve real-time positioning and timely correction.

[0003] Traditional measurement-while-drilling (MWD) devices are typically located more than nine meters from the drill bit, resulting in excessively long blind zones, delayed formation lithology assessments, and an inability to promptly identify high-quality reservoirs and adjust the wellbore trajectory. Furthermore, they fail to detect clay interlayers during horizontal drilling, leading to wellbore irregularities. Current technologies utilize slots in the inner and outer walls of the MWD sub, embedding the devices used to measure these parameters within these subs. This improves space utilization, shortens the MWD equipment length, and enhances the real-time performance and accuracy of the measured data. However, the production cost of this MWD device is extremely high, especially the fabrication of the slot structure on the inner wall, which is very difficult. In addition, the equipment is complex to install and disassemble, difficult to operate on-site, has high maintenance time and costs, and cannot flexibly replace parts or adapt to different needs.

[0004] To address the aforementioned issues, Chinese Patent CN109488289A discloses a multi-parameter measurement-while-drilling (MSWD) device, comprising: a housing including a first sleeve and a second sleeve, the second sleeve being detachably connected to the inner cavity of the first sleeve and located at the far end of the first sleeve; a multi-parameter acquisition module disposed on the outer wall of the first sleeve for acquiring gamma, azimuth, vibration, and resistivity data during drilling, including a resistivity sensor, a gamma sensor, an azimuth sensor, and a vibration sensor; a circuit module including a first circuit module and a second circuit module, the first circuit module being disposed in a first groove on the outer wall of the first sleeve, and the second circuit module being disposed on the second sleeve; and a transmitting antenna for transmitting data to a receiving sub disposed near the drill end of the first sleeve. This invention provides near real-time determination of the geological properties of the formation where the drill bit is located, is small in size, compact in structure, easy to assemble and disassemble, and has low production costs.

[0005] However, most existing measurement-while-drilling (MWD) devices use electric structures to drive pulse generators, thereby generating pulse waves in the drilling mud. For example, a motor drives a valve stem to extend and retract, shearing the mud to create mud segments to transmit information. Most existing MWD devices are powered by batteries, and the battery capacity directly limits the detection depth of the MWD device. Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a downhole operation measurement while drilling device that can reduce power consumption and extend its detection depth without affecting the operation.

[0007] The specific technical solution of this invention is as follows:

[0008] A downhole operation measurement-while-drilling device, the downhole operation measurement-while-drilling device comprising:

[0009] A mandrel tube with an axis;

[0010] The impeller drive mechanism, the sealing mechanism, and the valve seat are arranged sequentially from bottom to top within the mandrel tube. The valve seat has a flow port. The sealing mechanism can move up and down corresponding to the valve seat. When the fluid flows from bottom to top, the impeller drive mechanism can drive the sealing mechanism to move up and down, so that the sealing mechanism switches back and forth between sealing the flow port and separating from the flow port of the valve seat, thereby switching back and forth between the top and bottom of the valve seat within the mandrel tube between disconnection and connection.

[0011] Preferably, the impeller drive mechanism includes a driven blade mechanism, which includes a plurality of driven blades distributed circumferentially along the axis, the driven blades extending in a spiral manner;

[0012] The driven blade mechanism is connected to the sealing mechanism via a transmission connection;

[0013] When the fluid flows from bottom to top, it can drive the driven blade mechanism to rotate, so that the driven blade mechanism drives the sealing mechanism to move up and down.

[0014] Preferably, the driven blade mechanism further includes:

[0015] The first and second connecting rings are arranged side by side, one above the other.

[0016] The two ends of the driven blade are respectively connected to the first connecting ring and the second connecting ring.

[0017] Preferably, the blocking mechanism includes:

[0018] A shaft, the upper part of which has a thread, the thread being a bidirectional thread, and the shaft being fixedly connected to the driven blade mechanism;

[0019] A nut is fitted onto the thread;

[0020] A sealing element is fixedly connected to the nut, and the sealing element is capable of sealing the flow port.

[0021] Preferably, the inner wall of the driven blade is connected to the lower part of the shaft via a connecting post.

[0022] Preferably, the sealing mechanism further includes:

[0023] A first protective sleeve is fitted onto the threaded part of the shaft. The upper end of the first protective sleeve is connected to the sealing member, and the lower end of the first protective sleeve is connected to the nut.

[0024] Preferably, the sealing mechanism further includes:

[0025] The second protective sleeve is fitted onto the lower part of the shaft, and its upper end is connected to the nut.

[0026] Preferably, the lower part of the shaft has an annular limiting groove extending along the extension direction of the shaft, and the inner sidewall of the second protective sleeve has a protrusion that extends into the limiting groove. The protrusion can move within the limiting groove along the extension direction of the shaft, and the second protective sleeve and the shaft can rotate relative to each other.

[0027] Preferably, the upper end face of the sealing member has a limiting opening extending along the axis;

[0028] The lower end face of the valve seat is connected to a guide rod, which is at least partially inserted into the limiting port, and the limiting port and the guide rod cannot rotate circumferentially.

[0029] The valve seat is fixed to the mandrel tube.

[0030] Preferably, the inner wall of the mandrel tube has a recessed annular first groove and a second groove, the first connecting ring is disposed in the first groove, and the second connecting ring is disposed in the second groove;

[0031] The outer wall of the driven blade is connected to the inner wall of the first connecting ring and the second connecting ring.

[0032] Preferably, the impeller drive mechanism further includes a swirl generating mechanism; the swirl generating mechanism is located below the driven blade mechanism;

[0033] The swirling mechanism is used to generate swirling flow in fluid flowing from bottom to top.

[0034] Preferably, the spiral extension direction of the swirl blade is the same as the spiral extension direction of the driven blade.

[0035] Preferably, the swirl generating mechanism includes: a plurality of swirl blades distributed circumferentially along the axis, the swirl blades extending in a spiral manner;

[0036] The third and fourth connecting rings are arranged side by side, one above the other.

[0037] The two ends of the swirl blade are respectively connected to the third connecting ring and the fourth connecting ring.

[0038] Preferably, the inner wall of the mandrel tube has a recessed annular third groove and a fourth groove, the third connecting ring is disposed in the third groove, and the fourth connecting ring is disposed in the fourth groove;

[0039] The outer wall of the swirl blade is connected to the inner wall of the third connecting ring and the fourth connecting ring.

[0040] The swirl generating mechanism is fixed to the mandrel tube in the circumferential direction.

[0041] Preferably, the outer wall of the swirl blade abuts against the inner wall of the mandrel tube.

[0042] Preferably, the downhole measurement-while-drilling device includes:

[0043] The cylinder body, wherein the mandrel tube body is disposed within the cylinder body;

[0044] A flow divider is disposed inside the cylinder, above the mandrel tube, with its lower end connected to the upper end of the mandrel tube.

[0045] Preferably, a mounting cavity for mounting the measuring unit is formed between the inner wall of the cylinder and the outer wall of the mandrel tube.

[0046] The technical solution of the present invention has the following significant beneficial effects:

[0047] In this application, the downhole measurement-while-drilling (MWD) device is installed downstream of the drill bit used for drilling. When the drill bit reaches a muddy interlayer in the formation, the mud flows upward and enters the mandrel tube, flowing upward from bottom to top. At this time, the mud flows upward through the impeller drive mechanism inside the mandrel tube. Utilizing the kinetic energy of the mud on the impeller drive mechanism, the impeller drive mechanism drives the sealing mechanism to move upward. The sealing mechanism blocks the flow port of the valve seat, temporarily preventing the mud from continuing to flow upward through the flow port. After the sealing mechanism blocks the flow port of the valve seat, it continues to move downward under the drive of the impeller drive mechanism, thus separating from the flow port of the valve seat. Afterward, the mud can continue to flow upward through the flow port. Subsequently, the sealing mechanism moves up and down repeatedly, thus completing the interception and flow control of the mud, enabling the mud to generate pulse signals. After detection by the measurement unit, information about the drilling site is obtained. Compared to existing technologies that use electric drive structures to drive the plugging mechanism, this downhole measurement while drilling device can make full use of the power generated when the mud rises to automatically drive the plugging mechanism up and down. This not only avoids power consumption, but also avoids the limitation of the downhole measurement while drilling device on the power of electricity, enabling deeper detection depths. This is of great significance for exploring deep downhole environments.

[0048] Specific embodiments of the invention are disclosed in detail below with reference to the description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0049] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0050] Figure 1 This is a cross-sectional view of the downhole operation measurement-while-drilling device in an embodiment of the present invention;

[0051] Figure 2 This is a partial exploded view of the downhole measurement-while-drilling device in an embodiment of the present invention;

[0052] Figure 3 This is a schematic diagram of the mandrel tube and sealing component in an embodiment of the present invention;

[0053] Figure 4 This is a schematic diagram of the swirl generation mechanism in an embodiment of the present invention;

[0054] Figure 5 This is a schematic diagram of the driven blade mechanism and the sealing mechanism in an embodiment of the present invention;

[0055] Figure 6 This is an exploded view of the sealing mechanism in an embodiment of the present invention;

[0056] Figure 7 This is a schematic diagram of the sealing mechanism rising in an embodiment of the present invention;

[0057] Figure 8 This is a schematic diagram of the sealing mechanism descending in an embodiment of the present invention.

[0058] The reference numerals in the above figures are as follows:

[0059] 1. Mandrel tube body; 11. First annular groove; 12. Second annular groove; 13. Third annular groove; 14. Fourth annular groove; 2. Cylinder body; 3. Protective outer shell; 4. Diverter; 5. Impeller drive mechanism; 51. Driven blade mechanism; 511. Driven blade; 512. First connecting ring; 513. Second connecting ring; 52. Swirl generation mechanism; 521. Swirl blade; 522. Third connecting ring; 523. Fourth connecting ring; 6. Valve seat; 61. Guide rod; 62. Flow port; 7. Mounting cavity; 8. Sealing mechanism; 81. Shaft; 811. Limiting groove; 812. Thread; 82. Nut; 83. Sealing component; 831. Limiting port; 84. Connecting column; 85. First protective sleeve; 86. Second protective sleeve; 861. Protrusion. Detailed Implementation

[0060] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0061] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0062] In order to reduce power consumption and extend the detection depth without affecting operations, this application proposes a downhole measurement-while-drilling device. Figure 1 This is a cross-sectional view of the downhole measurement-while-drilling device in an embodiment of the present invention. Figure 2 This is a partial exploded view of the downhole measurement-while-drilling device in an embodiment of the present invention. Figure 3 This is a schematic diagram of the mandrel tube and sealing component in an embodiment of the present invention. Figure 4 This is a schematic diagram of the swirl generation mechanism in an embodiment of the present invention. Figure 5 This is a schematic diagram of the driven blade mechanism and the sealing mechanism in an embodiment of the present invention. Figure 6 This is an exploded view of the sealing mechanism in an embodiment of the present invention. Figure 7 This is a schematic diagram of the sealing mechanism rising in an embodiment of the present invention. Figure 8 This is a schematic diagram of the sealing mechanism descending in an embodiment of the present invention, as shown below. Figures 1 to 8As shown, the downhole measurement-while-drilling device may include: a mandrel tube 1 with an axis; an impeller drive mechanism 5, a plugging mechanism 8, and a valve seat 6 arranged sequentially from bottom to top within the mandrel tube 1. The valve seat 6 has a flow port 62. The plugging mechanism 8 can move up and down corresponding to the valve seat 6. When the fluid flows from bottom to top, the impeller drive mechanism 5 can drive the plugging mechanism 8 to move up and down so that the plugging mechanism 8 switches back and forth between plugging the flow port 62 and separating from the flow port 62 of the valve seat 6, so that the upper and lower parts of the valve seat 6 inside the mandrel tube 1 switch back and forth between disconnection and connection.

[0063] In this application, the downhole measurement-while-drilling (MWD) device is installed downstream of the drill bit used for drilling. When the drill bit reaches a clay interlayer in the formation, if... Figure 7 As shown, the mud flows upwards, entering the mandrel tube 1 and flowing upwards. At this time, the mud flows upwards through the impeller drive mechanism 5 inside the mandrel tube 1. Utilizing the kinetic energy of the mud on the impeller drive mechanism 5, the impeller drive mechanism 5 drives the sealing mechanism 8 to move upwards. The sealing mechanism 8 blocks the flow port 62 of the valve seat 6, temporarily preventing the mud from continuing to flow upwards through the flow port 62. After the sealing mechanism 8 blocks the flow port 62 of the valve seat 6, as... Figure 8 As shown, the plugging mechanism 8 continues to move downward under the drive of the impeller drive mechanism 5, thus separating from the flow port 62 of the valve seat 6. Afterward, the mud can continue to flow upward through the flow port 62. Subsequently, the plugging mechanism 8 moves up and down repeatedly, thus completing the interception and flow control of the mud, enabling the mud to generate pulse signals. These signals are then detected by the measurement unit to obtain information about the drilling environment. Compared to existing technologies that use an electric drive structure to drive the plugging mechanism 8, this downhole measurement-while-drilling device can fully utilize the power generated when the mud rises to automatically drive the plugging mechanism 8 up and down. This not only avoids power consumption but also avoids the limitation of the downhole measurement-while-drilling device's exploration depth imposed by electricity, enabling deeper exploration depths, which is of great significance for exploring deep downhole environments.

[0064] like Figure 1 and Figure 3 As shown, the mandrel tube 1 extends along the axial direction. The mandrel tube 1 has a flow channel for fluid to flow through. The fluid can flow through the mandrel tube 1 in a vertical direction. The flow channel is used to install components such as the impeller drive mechanism 5, the sealing mechanism 8, and the valve seat 6.

[0065] like Figure 1As shown, the impeller drive mechanism 5, the sealing mechanism 8, and the valve seat 6 are arranged sequentially from bottom to top inside the mandrel tube 1. The valve seat 6 is fixed to the mandrel tube 1. The valve seat 6 has a flow port 62. When the flow port 62 is blocked, the lower and upper ends of the valve seat 6 inside the mandrel tube 1 are completely disconnected. The outer side wall of the valve seat 6 is adapted to the inner side wall of the mandrel tube 1 so that there is essentially no gap between them. The sealing mechanism 8 can move up and down corresponding to the valve seat 6. When the sealing mechanism 8 moves upward, it can abut against the flow port 62 of the valve seat 6, thus blocking the flow port 62, at which point the fluid cannot pass through the valve seat 6. Then, when the sealing mechanism 8 moves downward, it separates from the flow port 62 of the valve seat 6, and the flow port 62 opens, allowing the fluid to flow through the flow port 62 and through the valve seat 6.

[0066] When the fluid flows from bottom to top, the impeller drive mechanism 5 uses the kinetic energy impact of the fluid to drive the blocking mechanism 8 to move up and down, so that the blocking mechanism 8 switches back and forth between blocking the flow port 62 and separating it from the flow port 62 of the valve seat 6, so that the upper and lower parts of the valve seat 6 inside the spindle tube 1 switch back and forth between disconnection and connection.

[0067] In one feasible implementation, such as Figure 1 and Figure 5 As shown, the impeller drive mechanism 5 may include a driven blade mechanism 51. The driven blade mechanism 51 includes a plurality of driven blades 511 distributed circumferentially along the axis, the driven blades 511 extending helically. The driven blade mechanism 51 is drively connected to the sealing mechanism 8. Because the driven blades 511 extend helically, they can drive the driven blade mechanism 51 to rotate when the fluid flows from bottom to top, so that the driven blade mechanism 51 drives the sealing mechanism 8 to move upward and downward.

[0068] In order to connect and fix multiple driven blades 511, such as Figure 1 and Figure 5 As shown, the driven blade mechanism 51 may include: a first connecting ring 512 and a second connecting ring 513 arranged side by side; the two ends of the driven blade 511 are respectively connected to the first connecting ring 512 and the second connecting ring 513.

[0069] To prevent the first connecting ring 512 and the second connecting ring 513 from obstructing the mud flow and thus reduce the resistance to mud flow, the inner wall of the mandrel tube 1 is provided with a recessed annular first groove 11 and a second groove 12. The first connecting ring 512 is disposed in the first groove 11, and the second connecting ring 513 is disposed in the second groove 12. The outer wall of the driven blade 511 is connected to the inner wall of the first connecting ring 512 and the second connecting ring 513.

[0070] In order for the driven blade mechanism 51 to drive the sealing mechanism 8 to move up and down, in one feasible embodiment, such as Figure 5 and Figure 6 As shown, the sealing mechanism 8 may include: a shaft 81, the upper part of which has a thread 812, the thread 812 being a bidirectional thread, the shaft 81 being fixedly connected to the driven blade mechanism 51; a nut 82, fitted onto the thread 812; and a sealing element 83, fixedly connected to the nut 82, capable of sealing the flow port 62. When the nut 82 rotates relative to the shaft 81 in one direction, it can move up and down on the upper part of the shaft 81 through the bidirectional thread. When the driven blade mechanism 51 drives the shaft 81 to rotate continuously in one direction, since the shaft 81 does not move in the vertical direction, the nut 82 must move upward or downward. When the nut 82 moves upward, it drives the sealing element 83 to move upward. When the nut 82 moves to the uppermost end of the bidirectional thread, the sealing element 83 moves to the valve seat 6 to seal the flow port 62. Subsequently, due to the bidirectional thread, the nut 82 moves downward, causing the sealing element 83 to move downward. The sealing element 83 separates from the flow port 62 of the valve seat 6, opening the flow port 62, allowing the mud to continue flowing upward through the flow port 62. When the nut 82 moves to the lowest point of the bidirectional thread, due to the bidirectional thread, the nut 82 moves upward again, and this process repeats.

[0071] like Figure 5 As shown, as an option, the inner wall of the driven blade 511 is connected to the lower part of the shaft 81 via a connecting post 84. There can be multiple connecting posts 84, which extend radially along the mandrel tube 1 and are arranged circumferentially.

[0072] To prevent mud from entering the thread 812 of the shaft 81 above the nut 82 and affecting the vertical movement of the nut 82 on the shaft 81, such as... Figure 6 As shown, the sealing mechanism 8 may include: a first protective sleeve 85, which is sleeved on the thread 812 of the shaft 81. The upper end of the first protective sleeve 85 is connected to the sealing member 83, and the lower end of the first protective sleeve 85 is connected to the nut 82. The first protective sleeve 85 not only connects the sealing member 83 and the nut 82, but also isolates the thread 812 above the nut 82 from the mud outside the first protective sleeve 85.

[0073] To prevent mud from entering the thread 812 of the shaft 81 below the nut 82, such as Figure 6 As shown, the sealing mechanism 8 may include a second protective sleeve 86, which is sleeved on the lower part of the shaft 81, and the upper end of the second protective sleeve 86 is connected to the nut 82. In this way, when the nut 82 moves upward, the thread 812 of the shaft 81 below the nut 82 can be isolated from the mud through the second protective sleeve 86.

[0074] Furthermore, such as Figure 6 As shown, the lower part of the shaft 81 has an annular limiting groove 811 extending along the extending direction of the shaft 81. The inner wall of the second protective sleeve 86 has a protrusion 861 that extends into the limiting groove 811. The protrusion 861 can move within the limiting groove 811 along the extending direction of the shaft 81, and the second protective sleeve 86 and the shaft 81 can rotate relative to each other. Through the cooperation of the limiting groove 811 and the protrusion 861, the uppermost position and the lowermost position of the nut 82 can be controlled.

[0075] In one feasible implementation, to prevent the nut 82 and the sealing element 83 from rotating together with the shaft 81, such as Figure 3 and Figure 5 As shown, the upper end face of the sealing member 83 has a limiting port 831 extending along the axis. A guide rod 61 is connected to the lower end face of the valve seat 6, and the guide rod 61 is at least partially inserted into the limiting port 831, preventing circumferential rotation between the limiting port 831 and the guide rod 61. The valve seat 6 is fixed to the spindle tube 1 to ensure that the valve seat 6 does not rotate circumferentially. For example, the cross-sections of the limiting port 831 and the guide rod 61 are irregular shapes, such as polygonal or non-circular shapes. The sealing member 83 and the guide rod 61 can move back and forth relative to each other in the axial direction.

[0076] As a feasible option, such as Figure 3 As shown, the limiting port 831 may have a support portion connected to the peripheral wall of the limiting port 831, and the guide rod 61 is connected to the support portion. The support portion may be cross-shaped, and the guide rod 61 is connected to the middle of the support portion.

[0077] To enhance the driving force generated on the driven blade mechanism 51 when mud impacts it, such as... Figure 1 As shown, the impeller drive mechanism 5 may include a swirl generating mechanism 52. The swirl generating mechanism 52 is located below the driven blade mechanism 51. The swirl generating mechanism 52 is used to generate swirl in fluid flowing upwards. When the swirl generating mechanism 52 generates swirl in slurry flowing upwards, the swirling slurry continues to flow upwards and impacts the driven blade mechanism 51, generating a stronger driving force to drive the driven blade mechanism 51 to rotate.

[0078] Specifically, such as Figure 4As shown, the swirl generating mechanism 52 may include multiple swirl blades 521 distributed circumferentially along the axis, the swirl blades 521 extending spirally. To achieve a fixed connection of the multiple swirl blades 521, the swirl generating mechanism 52 may further include a third connecting ring 522 and a fourth connecting ring 523 arranged vertically side-by-side. The two ends of the swirl blades 521 are respectively connected to the third connecting ring 522 and the fourth connecting ring 523.

[0079] Similarly, to avoid the third connecting ring 522 and the fourth connecting ring 523 obstructing the mud, thereby reducing the resistance during mud flow, it is feasible to, for example Figure 1 , Figure 3 and Figure 4 As shown, the inner wall of the mandrel tube 1 has a recessed annular third groove 13 and a fourth groove 14. A third connecting ring 522 is disposed in the third groove 13, and a fourth connecting ring 523 is disposed in the fourth groove 14. The outer wall of the swirl blade 521 is connected to the inner wall of the third connecting ring 522 and the fourth connecting ring 523. The swirl generating mechanism 52 is fixed to the mandrel tube 1 in the circumferential direction.

[0080] Preferably, the direction in which the swirl blade 521 extends in the threaded direction 812 can be the same as the direction in which the driven blade 511 extends in the threaded direction 812.

[0081] As a feasible option, such as Figure 1 and Figure 2 As shown, the downhole measurement-while-drilling (MWD) device may include: a cylinder 2, with a mandrel tube 1 disposed inside the cylinder 2; and a diverter 4, disposed inside the cylinder 2 above the mandrel tube 1, with the lower end of the diverter 4 connected to the upper end of the mandrel tube 1. The lower end of the diverter 4 may be connected to the upper end of the mandrel tube 1 via a threaded connection 812.

[0082] As a feasible option, such as Figure 1 As shown, a mounting cavity 7 for mounting the measuring unit is formed between the inner wall of the cylinder 2 and the outer wall of the mandrel tube 1. Specifically, the inner wall of the cylinder 2 has a first inner diameter section and a second inner diameter section with different inner diameters, which are connected by a stepped structure. The inner diameter of the first inner diameter section is larger than that of the second inner diameter section, and the first inner diameter section is located above the second inner diameter section. The inner diameter of the mandrel tube 1 is equal to that of the second inner diameter section, and the lower end of the mandrel tube 1 abuts against the stepped structure. In this way, there will be no resistance due to a sudden change in inner diameter when the mud flows into the mandrel tube 1 from the second inner diameter section. Alternatively, the fourth annular groove 14 can be located at the lower end face of the mandrel tube 1, so that the step of the cylinder 2 can be used to directly abut against the lower end face of the fourth connecting ring 523.

[0083] The outer wall of the mandrel tube 1 has a first outer diameter section and a second outer diameter section with different outer diameters, with the first outer diameter section located above the second outer diameter section. The outer diameter of the first outer diameter section is larger than that of the second outer diameter section, and the outer diameter of the second outer diameter section is larger than that of the second inner diameter section. An installation cavity 7 can be formed between the outer wall of the second outer diameter section and the inner wall of the first inner diameter section of the cylinder 2.

[0084] Furthermore, the outer wall of the swirl vane 521 can abut against the inner wall of the mandrel body 1, thereby transferring the heat from the measuring unit in the mounting cavity 7 to the side wall of the mandrel body 1 to the swirl vane 521, which is then carried away by the flowing mud. This enhances the heat dissipation effect on the measuring unit, enabling the downhole measurement-while-drilling device to perform measurement operations for extended periods. Furthermore, the installation position of the swirl vane 521 inside the mandrel body 1 can correspond to the position of the mounting cavity 7.

[0085] As a feasible option, such as Figure 1 and Figure 2 As shown, the downhole measurement-while-drilling device includes a protective housing 3, which can be fitted over the outside of the cylinder 2. An annular recess can be formed on the outer wall of the cylinder 2, and the protective housing 3 is disposed within the recess. The position of the protective housing 3 corresponds to the position of the mounting cavity 7, thereby protecting the measurement unit within the mounting cavity 7.

[0086] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0087] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A downhole measurement-while-drilling device, characterized in that, The downhole measurement-while-drilling device includes: A mandrel tube with an axis; An impeller drive mechanism, a sealing mechanism, and a valve seat are arranged sequentially from bottom to top within the mandrel tube. The valve seat has a flow port. The sealing mechanism is able to move up and down corresponding to the valve seat. When fluid flows from bottom to top, the impeller drive mechanism can drive the sealing mechanism to move up and down, so that the sealing mechanism switches back and forth between sealing the flow port and separating from the flow port of the valve seat, thereby switching back and forth between the top and bottom of the valve seat within the mandrel tube between disconnection and connection.

2. The downhole measurement and control (MWD) device according to claim 1, characterized in that, The impeller drive mechanism includes a driven blade mechanism, which includes a plurality of driven blades distributed circumferentially along the axis, the driven blades extending in a spiral. The driven blade mechanism is connected to the sealing mechanism via a transmission connection; When the fluid flows from bottom to top, it can drive the driven blade mechanism to rotate, so that the driven blade mechanism drives the sealing mechanism to move up and down.

3. The downhole measurement and control (MWD) device according to claim 2, characterized in that, The driven blade mechanism further includes: The first and second connecting rings are arranged side by side, one above the other. The two ends of the driven blade are respectively connected to the first connecting ring and the second connecting ring.

4. The downhole measurement-while-drilling device according to claim 2, characterized in that, The blocking mechanism includes: A shaft, the upper part of which has a thread, the thread being a bidirectional thread, and the shaft being fixedly connected to the driven blade mechanism; A nut is fitted onto the thread; A sealing element is fixedly connected to the nut, and the sealing element is capable of sealing the flow port.

5. The downhole measurement-while-drilling device according to claim 4, characterized in that, The inner wall of the driven blade is connected to the lower part of the shaft via a connecting post.

6. The downhole measurement-while-drilling device according to claim 4, characterized in that, The blocking mechanism also includes: A first protective sleeve is fitted onto the threaded part of the shaft. The upper end of the first protective sleeve is connected to the sealing member, and the lower end of the first protective sleeve is connected to the nut.

7. The downhole measurement-while-drilling device according to claim 4, characterized in that, The blocking mechanism also includes: The second protective sleeve is fitted onto the lower part of the shaft, and its upper end is connected to the nut.

8. The downhole measurement and control (MWD) device according to claim 7, characterized in that, The lower part of the shaft has an annular limiting groove extending along the extension direction of the shaft, and the inner side wall of the second protective sleeve has a protrusion that extends into the limiting groove. The protrusion can move within the limiting groove along the extension direction of the shaft, and the second protective sleeve and the shaft can rotate relative to each other.

9. The downhole measurement and control (MWD) device according to claim 4, characterized in that, The upper end face of the sealing component is provided with a limiting opening extending along the axis; The lower end face of the valve seat is connected to a guide rod, which is at least partially inserted into the limiting port, and the limiting port and the guide rod cannot rotate circumferentially. The valve seat is fixed to the mandrel tube.

10. The downhole measurement-while-drilling device according to claim 3, characterized in that, The inner wall of the mandrel tube has a recessed annular first groove and a second groove, the first connecting ring is disposed in the first groove, and the second connecting ring is disposed in the second groove. The outer wall of the driven blade is connected to the inner wall of the first connecting ring and the second connecting ring.

11. The downhole measurement-while-drilling device according to claim 2, characterized in that, The impeller drive mechanism further includes a swirl generating mechanism; the swirl generating mechanism is located below the driven blade mechanism; The swirling mechanism is used to generate swirling flow in fluid flowing from bottom to top.

12. The downhole measurement-while-drilling device according to claim 11, characterized in that, The spiral extension direction of the swirl blades is the same as that of the driven blades.

13. The downhole measurement-while-drilling device according to claim 11, characterized in that, The swirl generating mechanism includes: a plurality of swirl blades distributed circumferentially along the axis, the swirl blades extending in a spiral; The third and fourth connecting rings are arranged side by side, one above the other. The two ends of the swirl blade are respectively connected to the third connecting ring and the fourth connecting ring.

14. The downhole measurement-while-drilling device according to claim 13, characterized in that, The inner wall of the mandrel tube has a recessed annular third groove and a fourth groove, the third connecting ring is disposed in the third groove, and the fourth connecting ring is disposed in the fourth groove; The outer wall of the swirl blade is connected to the inner wall of the third connecting ring and the fourth connecting ring. The swirl generating mechanism is fixed to the mandrel tube in the circumferential direction.

15. The downhole measurement-while-drilling device according to claim 14, characterized in that, The outer wall of the swirl blade abuts against the inner wall of the mandrel tube.

16. The downhole measurement-while-drilling device according to claim 1, characterized in that, The downhole measurement-while-drilling device includes: The cylinder body, wherein the mandrel tube body is disposed within the cylinder body; A flow divider is disposed inside the cylinder, above the mandrel tube, with its lower end connected to the upper end of the mandrel tube.

17. The downhole measurement-while-drilling device according to claim 16, characterized in that, An installation cavity for mounting the measuring unit is formed between the inner wall of the cylinder and the outer wall of the mandrel tube.

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