Deflector installation structure

Abstract

The present invention relates to the field of drilling and directional logging technology, and specifically to a flow guide head installation structure for electrical connection, comprising a drill collar, a flow guide head, and an elastic gasket. The first hole wall of the drill collar forms a first through hole for fluid passage, the first hole wall is convexly provided with a step surface, the flow guide head is installed in the first through hole and is provided with a mating surface that cooperates with the step surface stopper, the elastic gasket is installed in the first through hole and abuts against the flow guide head along a first direction, and the elastic gasket is elastically deformed along the first direction toward the step surface under the action of a locking force to fasten the flow guide head to the drill collar. The flow guide head is positioned by the step surface, and then the flow guide head is limited and fixed between the step surface and the elastic gasket by the elastic gasket, so that the step surface can be set smaller, so that the flow field is uniform and the pressure drop is small. The processing requirements of the flow guide head, the drill collar, and the elastic gasket are relatively low, which reduces the difficulty during processing and assembly, reduces costs, and improves installation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of while-drilling and directional logging, and in particular to a guide head installation structure. Background Art

[0002] Existing downhole and directional logging instruments include a drill collar and a flow guide installed in a through hole in the drill collar. The flow guide is usually connected to the drill collar axially by screws. In this case, a mounting step needs to be protruded from the through hole of the drill collar, and the flow guide needs to be provided with a mating step that matches the mounting step for screw installation. However, to meet strength requirements, the screw usually needs to be larger, and accordingly, the size of the mounting step also needs to be larger. When the mud fluid flows through the mounting step and the mating step, the mud fluid is prone to turbulence, which will cause erosion of the drill collar and the flow guide, affecting the service life. In addition, when the drill collar is working underground, the vibration of the instrument will generate a large impact force on the drill collar and the flow guide, so the structural strength design of the drill collar and the flow guide is required to be higher to improve the installation stability of the drill collar and the flow guide.

[0003] Therefore, it is necessary to design a new guide head installation structure to overcome the above problems. Summary of the Invention

[0004] In order to overcome the above technical problems, the present invention provides a guide head installation structure, which is formed by setting a step surface on the drill collar to cooperate with the mating surface of the guide head for positioning, and then preventing the guide head from detaching in the direction away from the step surface through the elastic squeezing of the elastic gasket, so as to firmly install the guide head in the drill collar, reduce the size requirements of the step surface, so that the step surface can be set smaller, thereby reducing the turbulence of the fluid, preventing the drill collar and the guide head from being washed by the fluid, and extending the service life.

[0005] The present invention provides a guide head installation structure, comprising:

[0006] A drill collar is provided with a first hole wall extending along a first direction, the first hole wall enclosing a first through hole for fluid to pass through, and the first hole wall is convexly provided with a step surface;

[0007] A flow guide head is installed in the first through hole and is provided with a mating surface that cooperates with the step surface stopper, and a second through hole is provided in the flow guide head that is in communication with the first through hole;

[0008] An elastic gasket is installed in the first through hole and abuts against the guide head along the first direction. The step surface faces the elastic gasket along the first direction. The elastic gasket is elastically deformed toward the step surface along the first direction under the action of the locking force to fasten the guide head to the drill collar.

[0009] In some technical solutions, the size range of the step surface protruding inward toward the first through hole relative to the first hole wall is 1-5 mm, and the matching height range between the mating surface and the step surface is 0.5-5 mm; the step surface is a conical step surface; the mating surface is a conical mating surface that matches the conical step surface; the conical angle range of the conical step surface and the conical mating surface is both 5-20 degrees, and the length range of the conical slope is 5-30 mm.

[0010] In some technical solutions, it also includes a positioning pin located between the step surface and the elastic gasket, the drill collar is provided with a first positioning hole arranged along the second direction, the guide head is provided with a second positioning hole connected to the first positioning hole, the positioning pin passes through the first positioning hole along the second direction and is inserted into the second positioning hole, the positioning pin outer sleeve is provided with a first elastic ring and a second elastic ring arranged at intervals along the second direction, the first elastic ring abuts between the positioning pin and the hole wall of the first positioning hole, the second elastic ring abuts between the positioning pin and the hole wall of the second positioning hole, and the second direction is not parallel to the first direction.

[0011] In some technical solutions, the ratio of the length of the elastic gasket along the first direction to the aperture of the first through hole is greater than 0.5.

[0012] In some technical solutions, the guide head includes a connecting shell that cooperates with the first hole wall and a joint body connected to the connecting shell, the connecting shell is provided with the second through hole, the joint body is protruded inwardly relative to the drill collar in the second through hole, the joint body includes a pin portion, the pin portion is outerly provided with the elastic gasket that abuts the connecting shell along the first direction, and a third through hole connected to the first through hole and the second through hole is formed between the elastic gasket and the pin portion.

[0013] In some technical solutions, the first direction is the front-to-back direction, the pin portion protrudes backward from the connecting shell, and the elastic gasket protrudes backward from the pin portion; the pin portion is provided with a flow channel pin, and the elastic gasket extends forward beyond the flow channel pin.

[0014] In some technical solutions, the first direction is the front-to-back direction, and the outer wall of the connecting shell is provided with a first support member and a second support member, the first support member and the second support member are abutted between the connecting shell and the drill collar, and the first support member and the second support member are respectively located on the front and back sides of the step surface.

[0015] In some technical solutions, the connector body also includes a connecting part connected to the pin part, and the connecting part is installed with a pin assembly located between the step surface and the elastic gasket, and the pin assembly is electrically connected to the flow channel pin of the pin part. The connecting shell is also covered with a plurality of first sealing rings and second sealing rings, and the first sealing ring and the first support member are both located on the front side of the pin assembly and the step surface, and the first sealing ring and the first support member are both located on the rear side of the pin assembly and the step surface; the first support member is recessed with a first groove, and the first groove accommodates the first sealing ring, and the first sealing ring abuts between the first support member and the first hole wall, and the second support member is recessed with a second groove, and the second groove accommodates the second sealing ring, and the second sealing ring abuts between the first support member and the first hole wall.

[0016] In some technical solutions, the elastic gasket is provided with a first abutting surface and a second abutting surface spaced apart along the first direction, the guide head is provided with a third abutting surface opposite to the first abutting surface along the first direction, the drill collar is provided with a locking structure for locking with the docking shell, the second abutting surface is used to abut with the docking shell, and during the locking process of the drill collar and the docking shell, the second abutting surface abuts with the docking shell and is elastically deformed along the first direction toward the step surface by the locking force of the drill collar and the docking shell to fasten the guide head to the drill collar.

[0017] In some technical solutions, the elastic gasket has an abutting portion and a yielding portion spaced apart along the circumferential direction, the abutting portion abuts against the first hole wall, and a gap is formed between the yielding portion and the first hole wall.

[0018] In summary, compared with the prior art, the present invention has the following effects:

[0019] The guide head is positioned by the step surface, and then the guide head is limited to the step surface and the elastic gasket along the first direction by the elastic gasket. The elastic gasket is elastically deformed along the first direction by the locking force. At this time, the elastic gasket is in a compressed state, which produces elastic squeezing on the guide head, thereby preventing the guide head from detaching in the direction away from the step surface, so as to firmly install the guide head in the drill collar. At this time, the step surface is not affected by other structures, the size of the step surface does not need to be set large, which reduces the size requirements of the step surface. The size of the step surface can be set smaller as long as it can have a positioning function. Accordingly, the cross-sectional area of the first through hole and the second through hole can be set larger and the difference between the cross-sectional areas of the first through hole and the second through hole can be set smaller, so that when the fluid flows from the first through hole to the second through hole, it can be relatively smooth without generating large turbulence, with excellent flow field performance, uniform flow field, and small pressure drop, which is conducive to preventing the fluid from scouring the drill collar and the guide head, extending the service life of the drill collar and the guide head, and saving costs. In addition, the shock-absorbing and buffering effect of the elastic gasket can buffer the vibration of the drill collar and the guide head, and further reduce the scouring of the guide head by the fluid, so that the fastening force of the guide head installed in the drill collar can be set smaller and not easily damaged. The structural strength requirements of the guide head can also be lower. The elastic squeezing force of the elastic gasket on the guide head makes the guide head less likely to loosen, meeting the installation and use of the guide head. In addition, by setting the step surface and the elastic gasket, the guide head can be easily installed in the first through hole of the drill collar without the assistance of complex tools, which is convenient for installation. At the same time, the step surface of the drill collar and the contact surface of the guide head have a positioning function, and the elastic gasket mainly abuts against the guide head and applies elastic squeezing force to the guide head, without the need for high processing and installation precision matching. Therefore, the processing requirements of the guide head, drill collar and elastic gasket are relatively low, which reduces the difficulty during processing and assembly, and is conducive to reducing costs and improving installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of an assembly of a guide head installation structure provided by a specific embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Explosion diagram of

[0022] Figure 3 yes Figure 1 Schematic diagram of the cross-section structure;

[0023] Figure 4 yes Figure 1 Schematic diagram of the explosion cross-section structure;

[0024] Figure 5 yes Figure 3 Schematic diagram of the cross-sectional structure of the drill collar part;

[0025] Figure 6 yes Figure 3 A schematic diagram of the cross-sectional structure of the guide head portion;

[0026] Figure 7 yes Figure 3 A partial enlarged schematic diagram of the positioning pin assembly;

[0027] Figure 8 yes Figure 3 A partial enlarged schematic diagram of the pin assembly assembly;

[0028] Figure 9 is a cross-sectional schematic diagram of a guide head installation structure provided by a specific embodiment of the present invention;

[0029] Figure 10 yes Figure 1 A schematic side view of an elastic gasket;

[0030] Figure 11 It is a schematic diagram of the elastic gasket structure provided by a specific embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 100. Guide head installation structure;

[0033] 1. Drill collar; 11. First hole wall; 111. Step surface; 112. First wall; 113. Second wall; 114. Connecting wall; 12. First through hole; 13. First positioning hole; 14. Mounting slot; 15. First pin hole;

[0034] 2. Flow guide; 21. Connecting housing; 211. Mating surface; 212. Avoidance groove; 213. Second through hole; 214. Third abutting surface; 215. First support member; 2151. First groove; 216. Second support member; 2161. Second groove; 22. Connector body; 221. Pin portion; 2211. Flow channel pin; 222. Connecting portion; 2221. Second positioning hole; 2222. Second pin hole; 23. First sealing ring; 24. Second sealing ring;

[0035] 3. Elastic gasket; 31. Third through hole; 32. First abutting surface; 33. Second abutting surface; 34. Abutting portion; 35. Yielding portion;

[0036] 4. Positioning pin; 41. Threaded hole;

[0037] 5. First elastic ring;

[0038] 6. Second elastic ring;

[0039] 7. Cover plate;

[0040] 8. Pin assembly; 81. Male pin; 82. Female pin;

[0041] 9. Docking shell. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] It should be noted that when an element is considered to be "transmitting" another element, it can be directly transmitted to the other element or there may be an intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0044] To facilitate understanding by those skilled in the art, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0045] Since the existing drill collar through hole needs to be provided with a mounting step and the guide head needs to be provided with a matching step that matches the mounting step for screw installation, however, in order to meet the installation and use requirements, the screws usually need to be set larger, and accordingly, the size of the mounting step also needs to be set larger. When the fluid flows through the mounting step and the matching step, the fluid is prone to turbulence, which will cause erosion of the drill collar and the guide head, affecting the service life, requiring the structural strength design of the drill collar and the guide head to be higher, and affecting the installation stability of the drill collar and the guide head, and at the same time affecting the signal transmission stability of the guide head. At the same time, a flow channel for the fluid to pass through needs to be provided in the guide head, and the size of the flow channel meets the requirements to ensure a small pressure drop and a uniform flow field for the guide head. The larger the inner diameter of the flow channel, the larger the flow channel area. Under the same displacement, the lower the flow rate. In theory, the larger the flow channel area, the better under the condition of meeting the strength requirements. In addition, the wall thickness of the guide head cannot be set too small to meet the structural strength. If the wall thickness of the guide head is set larger, the ratio of the flow channel space inside the guide head to the overall structure will be reduced, and the corresponding contact area between the fluid and the flow channel inside the guide head will be reduced, so that the guide head needs to be set with higher strength or larger size.

[0046] Therefore, in the existing technology, the size of the downhole and directional logging instrument cannot be set smaller, usually type 675 and type 800, or other models with an outer diameter greater than 150 mm. When the size of the downhole and directional logging instrument needs to be set smaller, when the outer diameter needs to be set to a small size model less than 150 mm, if the screw installation method is adopted, the screw size needs to be set to M8 or above, and the corresponding flow channel size in the guide head needs to be reduced, which can no longer meet the flow channel requirements in the guide head. However, the screw installation method can ensure that the drill collar and the guide head have greater installation strength, and it is usually necessary to select the screw installation method to connect the drill collar and the guide head.

[0047] For small-sized while-drilling and directional logging instruments, the existing technology cannot find an effective installation method to increase the flow channel size of the flow guide head while meeting the installation strength and structural strength of the drill collar and the flow guide head, and meet the flow field performance requirements of the flow guide head, including: low flow velocity, uniform flow field, and small pressure drop.

[0048] Furthermore, existing LWD and directional logging instruments rely on the end face of the flow guide head for axial positioning, locating pins for radial positioning and fixation, and screws for final axial positioning and fixation. During assembly, the flow guide head must first be pushed into the drill collar using a specialized pulling tool. Once the pin holes of the flow guide head and drill collar are aligned, the pin holes on both sides are aligned, and then the end screws are secured. This structure places high demands on the precision machining of the end face threaded holes, locating pin holes, and radial pin holes, making assembly challenging.

[0049] The inventor provides an axially positioned step surface in the drill collar, a flow guide head is provided with a mating surface that cooperates with the step surface stop, and an elastic gasket is provided axially in the drill collar to press the flow guide head. The locking force when the docking shell and the drill collar are mated is used to make the elastic gasket elastically deform and squeeze the flow guide head to fasten the flow guide head to the drill collar. Experiments have shown that this installation method meets the installation and use requirements of small-sized downhole and directional logging instruments with an outer diameter of less than 150 mm. The installation strength and structural strength of the drill collar and the flow guide head also meet the requirements. At the same time, the flow channel size in the flow guide head can be set larger, thereby overcoming the above-mentioned technical problems.

[0050] The specific embodiments of the present invention are as follows:

[0051] like Figures 1 to 10 As shown, the flow guide head mounting structure 100 of this embodiment is used for a 475 type while-drilling and directional logging instrument, and the flow guide head mounting structure 100 is electrically connected to a docking component. Of course, in other embodiments, the flow guide head mounting structure 100 can also be installed in other small-sized while-drilling and directional logging instruments with an outer diameter less than 150 mm, or other products that have the flow guide head mounting structure 100 of the present invention and are used for mechanical support, sealing, and electrical connection, as needed, without limitation herein.

[0052] like Figures 1 to 4As shown, the guide head mounting structure 100 includes a drill collar 1, a guide head 2 and an elastic gasket 3. The drill collar 1 is threadedly locked with the docking shell 9. A first hole wall 11 extending along a first direction is provided in the drill collar 1. The first hole wall 11 forms a first through hole 12 for fluid to pass through. The first hole wall 11 is convexly provided with a step surface 111 for positioning and stopping. The guide head 2 is installed in the first through hole 12 and is provided with a matching surface 211 that stops with the step surface 111. A second through hole 213 communicating with the first through hole 12 is provided in the guide head 2. The guide head 2 is used for mechanical The supporting sealing function and electrical connection are achieved. The elastic gasket 3 is installed in the first through hole 12 and abuts against the guide head 2 in the first direction. The step surface 111 faces the elastic gasket 3 in the first direction. During the process of threaded tightening of the drill collar 1 and the docking shell 9 of the docking member, the drill collar 1 and the docking shell 9 are docked and matched in the first direction and generate a locking force in the first direction. The elastic gasket 3 abuts against the docking shell 9, so that the elastic gasket 3 is elastically deformed in the first direction toward the step surface 111 under the action of the threaded locking force between the drill collar 1 and the docking shell 9 to fasten the guide head 2 to the drill collar 1. Among them, the first direction refers to the direction along which the fluid flows in, and the first hole wall 11 refers to the inner wall of the drill collar 1. For the convenience of understanding and explanation, in this embodiment, the first direction is the front-to-back direction. In other embodiments, the first direction can also be the left-right direction, the up-down direction, or other directions, which can be set as needed and are not limited here. In other embodiments, the docking housing 9 may also be interference-fitted with the flow guide head 2, and the drill collar 1 and the flow guide head 2 may also be locked together by a snap-fit structure, or locked together by other locking structures, without limitation herein, as long as the elastic gasket 3 is elastically deformed by the locking force along the first direction. Furthermore, in this embodiment, the fluid is mud, but in other embodiments, under different usage environments, the fluid may also be liquid, without limitation herein.

[0053] like Figures 3 to 6As shown, in this embodiment, the guide head 2 is positioned by the step surface 111, and then the guide head 2 is constrained between the step surface 111 and the elastic gasket 3 in the front-to-back direction. The elastic gasket 3 is elastically deformed in the front-to-back direction by the locking force. At this time, the elastic gasket 3 is in a compressed state, elastically squeezing the guide head 2, thereby preventing the guide head 2 from escaping away from the step surface 111 during use, thereby firmly installing the guide head 2 in the drill collar 1. In this case, the step surface 111 is not affected by other structures, and the size of the step surface 111 does not need to be large, which reduces the size requirements of the step surface 111. The size of the step surface 111 can be smaller as long as it can provide a positioning function. This ensures that when the fluid flows from the first through hole 12 to the second through hole 213, it can be relatively smooth and does not generate significant turbulence. The flow field performance is excellent, the flow field is uniform, and the pressure drop is small. This helps to prevent the fluid from scouring the drill collar 1 and the guide head 2, extending the service life of the drill collar 1 and the guide head 2, and saving costs. In addition, the shock-absorbing and buffering effect of the elastic gasket 3 can buffer the vibration of the drill collar 1 and the guide head 2, and further reduce the impact of fluid on the guide head 2, so that the tightening force of the guide head 2 installed in the drill collar 1 can be set to be smaller and less prone to damage. The structural strength requirements of the guide head 2 can also be lowered. The elastic extrusion force of the elastic gasket 3 on the guide head 2 makes it difficult for the guide head 2 to loosen, meeting the installation and use requirements of the guide head 2. In addition, the arrangement of the step surface 111 and the elastic gasket 3 can facilitate the installation of the guide head 2 in the first through hole 12 of the drill collar 1, without the need for complex tools to assist, making installation convenient. At the same time, the contact surface of the step surface 111 of the drill collar 1 and the guide head 2 only needs to have a positioning function, and the elastic gasket 3 mainly abuts the guide head 2 and applies elastic extrusion force to the guide head 2, without the need for high processing and installation precision matching. Therefore, the processing requirements of the guide head 2, the drill collar 1, and the elastic gasket 3 are relatively low, reducing the difficulty of processing and assembly, which is conducive to reducing costs and improving installation efficiency.

[0054] Among them, when the flow guide head 2 of this embodiment is applied to other types of downhole and directional logging instruments with an outer diameter greater than 150 mm, such as the 675 and 800 downhole and directional logging instruments, the size of the step surface 111 does not need to be set larger, which reduces the size requirements of the step surface 111. The size of the step surface 111 can be set smaller, and there is no need to set screws for fixing. This increases the flow channel area within the flow guide head 2 to reduce turbulence, reduces the scouring of the drill collar 1 and the flow guide head 2 by the fluid, and extends the service life of the instrument. In addition, the tightening force of the flow guide head 2 installed in the drill collar 1 can be set smaller, and the structural strength requirements of the flow guide head 2 and the drill collar 1 can also be lower. Even if screws are set for fixing, the size of the screws used to connect the drill collar 1 and the flow guide head 2 can be set smaller. Without changing the size of the screws, the service life of the flow guide head 2 and the drill collar 1 is extended.

[0055] like Figures 2 to 4and Figure 11 As shown, the elastic gasket 3 is provided with a first abutting surface 32 and a second abutting surface 33 spaced apart along the front-to-back direction. The flow guide head 2 is provided with a third abutting surface 214 opposite the first abutting surface 32 along the front-to-back direction. The second abutting surface 33 is used to abut against the docking housing 9. During the locking process between the drill collar 1 and the docking housing 9, the second abutting surface 33 abuts against the docking housing 9 and, under the action of the locking force between the drill collar 1 and the docking housing 9, elastically deforms toward the step surface 111 along the front-to-back direction to secure the flow guide head 2 to the drill collar 1. In this embodiment, the ratio of the length of the elastic gasket 3 to the aperture length of the first through hole 12 is 0.9; in other embodiments, this ratio is set to a value greater than 0.5. Since the elastic gasket 3 is easily deformed after long-term compression, in order to increase the service life of the elastic gasket 3, it is necessary to ensure that the elastic gasket 3 has sufficient elastic margin. By designing the ratio of the length of the elastic gasket 3 to the maximum aperture length of the first through hole 12 to be greater than 0.5, the service life of the elastic gasket 3 is increased. In this embodiment, the elastic gasket 3 is made of Teflon material. The Teflon elastic gasket 3 is resistant to high temperatures and corrosion, adapting to the harsh environment of the underground mine and extending its service life. In other embodiments, the elastic gasket 3 may also be provided with a spring, or made of an elastic rubber material, or made of other elastic plastic materials, without limitation herein, as long as the elastic gasket 3 is elastically deformable in the axial direction.

[0056] like Figure 2 、 Figure 10 and Figure 11 As shown, the elastic gasket 3 has an abutting portion 34 and a relief portion 35 spaced apart along the circumferential direction. The abutting portion 34 abuts the first hole wall 11, and a gap is formed between the relief portion 35 and the first hole wall 11. The outer wall formed by the abutting portion 34 and the relief portion 35 is a non-circular polygonal structure. The abutting portion 34 abuts the first hole wall 11 to provide a vibration-damping and buffering effect on the force acting on the drill collar 1. The provision of the relief portion 35 facilitates the installation of the elastic gasket 3 in the first through hole 12. At the same time, when the elastic gasket 3 is elastically compressed, the gap between the relief portion 35 and the first hole wall 11 can provide deformation space, preventing the elastic gasket 3 from exerting a large extrusion force on the drill collar 1 in the radial direction. The inner wall of the elastic gasket 3 is circular to adapt to the circular inner wall of the connecting shell 21 and reduce fluid erosion. In other embodiments, the abutting portion 34 and the relief portion 35 of the elastic gasket 3 can also be formed into other shapes, which are not limited here.

[0057] like Figures 3 to 6 and Figure 9As shown, the drill collar 1 and the flow guide head 2 are positioned along the second direction by the positioning pin 4. At this time, the positioning pin 4 has a circumferential positioning function. The drill collar 1 is provided with a first positioning hole 13 arranged along the up-down direction, and the flow guide head 2 is provided with a second positioning hole 2221 connected to the first positioning hole 13. The positioning pin 4 passes through the first positioning hole 13 along the up-down direction and is inserted into the second positioning hole 2221. Accordingly, the positioning pin 4 passes through the connecting shell 21 and the joint body 22 at the same time. At this time, the positioning pin 4 only needs to play an auxiliary positioning role and does not play a fixing role. Therefore, there is no need for direct contact between the positioning pin 4 and the drill collar 1 and the flow guide head 2. A larger gap can be left to facilitate assembly. At the same time, the processing requirements of the positioning pin 4 and the first positioning hole 13 and the second positioning hole 2221 are relatively low. In this embodiment, the second direction is the up-down direction, and the cross-sections of the drill collar 1 and the flow guide head 2 are both circular. The up-down direction is one of the radial directions, and the front-back direction is the axial direction. In other embodiments, the second direction can also be the left-right direction, or other radial directions, or other directions that are not parallel to the first direction, so as to position the drill collar 1 and the guide head 2 from different directions to make the installation positioning more accurate, and the cross-section of the drill collar 1 and the guide head 2 can also be square, oval or other shapes, which can be set according to actual needs and are not limited here.

[0058] like Figures 2 to 5 and Figure 9 As shown, the outer diameter of the drill collar 1 is 136 mm. In other embodiments, the circumferential dimension of the drill collar 1 perpendicular to the front-to-back direction may also be other dimensions less than 150 mm, as required and not limited herein. The drill collar 1 is provided with a first pin hole 15 along the vertical direction for the pin assembly 8 to pass through. The locating pin 4 and the pin assembly 8 are both located between the stepped surface 111 and the elastic gasket 3. A mounting groove 14 is recessed into the outer wall of the drill collar 1. A cover plate 7 is mounted on the mounting groove 14 and is screwed to the drill collar 1. The cover plate 7 covers the locating pin 4 and the pin assembly 8 to radially limit the locating pin 4 and the pin. A sealing ring is provided on the cover plate 7 to provide a waterproof seal around the locating pin 4 and the pin assembly 8.

[0059] like Figures 3 to 5As shown, the first hole wall 11 includes a first wall 112 and a second wall 113 provided behind the first wall 112. The first wall 112 is provided with a threaded structure for threaded connection with the docking housing 9. A connecting wall 114 is connected between the first wall 112 and the second wall 113. The connecting wall 114 protrudes inwardly toward the first through hole 12 relative to both the first wall 112 and the second wall 113, and the step surface 111 is provided on the connecting wall 114. In other embodiments, the connecting wall 114 may be flush with the second wall 113 or recessed relative to the second wall 113, while the connecting wall 114 protrudes inwardly toward the first through hole 12 relative to the first wall 112. The step surface 111 protrudes inwardly toward the first through hole 12 by approximately 3 mm relative to the first wall 112, and the fitting height between the mating surface 211 and the step surface 111 is approximately 1.5 mm. In other embodiments, the step surface 111 may also protrude from the first wall 112 to any other height within the size range of 1-5 mm, and the fitting height between the mating surface 211 and the step surface 111 may be any other height within the range of 0.5-5 mm. As long as the positioning function of the drill collar 1 and the guide head 2 is ensured while the protruding height of the step surface 111 is small, the turbulent effect of the fluid passing through the protruding part of the step surface 111 can be reduced. While ensuring the strength of the guide head 2, the flow channel area can be increased and the flow field performance of the flow channel can be optimized. It can be set as needed and is not limited here.

[0060] like Figures 3 to 5As shown, the step surface 111 is a conical step surface 111, and the mating surface 211 is a conical mating surface 211 that matches the conical step surface 111. The conical angle between the conical step surface 111 and the conical mating surface 211 is approximately 15 degrees, and the length of the conical slope between the conical step surface 111 and the conical mating surface 211 is approximately 10 mm. Compared with the mating structure of the right-angle step surface 111 and the right-angle mating surface 211, the mating of the conical step surface 111 and the conical mating surface 211 can achieve a larger contact area at the same height, a larger flow channel area, reduce contact stress, enhance the structural strength of the step surface 111, and improve the coaxiality of the conical surface mating. When relative displacement occurs between the guide head 2 and the first hole wall 11, the conical surface mating is a line contact, which can generate a large axial pressure while obtaining a large friction force, thereby reducing such relative displacement. In addition, the mating structure between the conical step surface 111 and the conical mating surface 211 can further reduce the thickness of the contact surface of the step surface 111 protruding from the first hole wall 11 and contacting the guide head 2, thereby further reducing the thickness of the first hole wall 11, increasing the contact area between the first through hole 12 and the second through hole 213 and the fluid, and increasing the flow channel area, which can reduce the flow rate and further reduce the erosion of the fluid on the guide head 2, helping to further disperse the force of the fluid on the mounting structure and further protect the stability of the mounting structure. In addition, the use of conical surface mating improves the coaxiality of the drill collar 1 and the guide head 2, and the conical step surface 111 can also avoid stress concentration. In other embodiments, the taper angle can also be set to any other angle between 5 and 20 degrees, and the length of the tapered slope can be set to any other length between 5 and 30 mm, as long as the mating height range of the step surface 111 and the mating surface 211 is between 0.5 and 5 mm. It can be set as needed and is not limited here.

[0061] like Figure 3 、 Figure 4 and Figure 6 As shown, the guide head 2 includes a connecting shell 21 that cooperates with the first hole wall 11 and a joint body 22 connected to the connecting shell 21. The second positioning hole 2221 passes through the connecting shell 21 and extends to the joint body 22. A second through hole 213 that communicates with the first through hole 12 is provided in the connecting shell 21. The joint body 22 is protruded inwardly relative to the drill collar 1 in the second through hole 213, wherein a supporting wing-shaped flow channel is formed between the connecting shell 21 and the joint body 22, as shown in FIG. Figure 11As shown, in order to allow fluid to pass through, the radial dimension of the supporting wing-shaped flow channel is greater than the wall thickness of the connecting shell 21 to increase the flow channel area of the fluid and reduce the erosion of the mud on the guide head 2. The supporting wing-shaped flow channel is a symmetrical structure that is symmetrical along the left and right directions. The fluid passes through the supporting wing-shaped flow channel, and the fluid is also symmetrical at various cross-sections of the supporting wing-shaped flow channel. The supporting wing and the top shape are designed to be a smooth curved surface shape. A large fillet is designed at the contact point between the supporting wing and the connecting shell 21 to avoid stress concentration, ensure a uniform flow field, prevent turbulence at the edge of the flow channel, and reduce the unbalanced fluid pressure that forms erosion on the guide head 2. Long-term fluid erosion will destroy the structural strength of the guide head 2 and affect its service life.

[0062] like Figure 3 、 Figure 4 and Figure 6 As shown, the outer wall of the connecting shell 21 is provided with a conical mating surface 211, and the outer wall of the connecting shell 21 is provided with an avoidance groove 212 located in front of the mating surface 211 to facilitate the installation of the guide head 2 from the back to the front in the first through hole 12. The outer wall of the connecting shell 21 is provided with a first support member 215 and a second support member 216. The first support member 215 and the second support member 216 abut between the connecting shell 21 and the drill collar 1. The first support member 215 and the second support member 216 are respectively located on the front and rear sides of the step surface 111. When the guide head 2 is installed, the drill collar 1 and the guide head 2 mounting surfaces are not coaxial due to processing, and the guide head 2 self-weight causes the drill collar 1 and the guide head 2 to be not coaxial during actual assembly, which causes the sealing surface between the drill collar 1 and the guide head 2 to be damaged during assembly. The first support member 215 and the second support member 216 are provided to support the guide head 2, ensuring that the guide head 2 is supported during assembly to avoid damage to the sealing surface. In addition, the first support member 215 and the second support member 216 are provided on both sides of the step surface 111 to balance the circumferential positioning deviation of the front and rear sides of the step surface 111, ensuring that the guide head 2 and the drill collar 1 remain coaxial during assembly, and also achieving convenient assembly and maintenance, and ultimately making assembly and maintenance more convenient and quick, thereby saving cost and time. In this embodiment, the material of the first support member 215 and the second support member 216 are both PEEK, which is an elastic material with a certain compression amount to better adjust the coaxiality of the guide head 2 and the drill collar 1. In other embodiments, the material of the first support member 215 and the second support member 216 can also be a rigid material, which is not limited here, as long as the coaxiality of the guide head 2 and the drill collar 1 can be adjusted.

[0063] like Figure 3 、 Figure 4 and Figure 6As shown, the connecting housing 21 is also sheathed with a plurality of first and second sealing rings 23, 24. The first sealing ring 23 and first support member 215 are both located in front of the pin assembly 8 and the stepped surface 111, and are both located behind the pin assembly 8 and the stepped surface 111. The provision of the first and second support members 215, 216 prevents misalignment between the drill collar 1 and the flow guide head 2 from affecting the sealing effect of the first and second sealing rings 23, 24, and scratching the sealing surfaces. It also prevents fluid from flowing between the stepped surface 111 and the contact surface, preventing the pin assembly from being burned by the inflowing fluid, and preventing the flow guide head 2 from affecting the positioning stability of the drill collar 1 and the flow guide head 2, thereby ensuring a secure installation of the drill collar 1 and the flow guide head 2. Furthermore, the first and second sealing rings 23, 24 also provide a vibration-damaging effect on the pin assembly 8, preventing vibration of the drill collar 1 from affecting the electrical connection stability of the pin assembly 8.

[0064] like Figure 3 、 Figure 4 and Figure 6 As shown, three first sealing rings 23 and three second sealing rings 24 are provided. The first support member 215 is provided with a first groove 2151, which accommodates a first sealing ring 23. The first sealing ring 23 abuts between the first support member 215 and the first hole wall 11. The second support member 216 is provided with a second groove 2161, which accommodates a second sealing ring 24. The second sealing ring 24 abuts between the first support member 215 and the first hole wall 11. The first sealing ring 23 and the second sealing ring 24 are respectively provided in the first groove 2151 and the second groove 2161 to achieve a better straightening support effect. That is, by tightening the first support member 215 and the second support member 216, the coaxiality between the guide head 2 and the drill collar 1 is ensured during installation, preventing the sealing surface from being scratched. In addition, it also has a certain sealing and buffering effect, preventing the first support member 215 and the second support member 216 from being misaligned with the first hole wall 11, which would cause scratches on the sealing surface. The first and second sealing rings 23, 24 are made of rubber or other elastic materials, increasing friction and further preventing the guide head 2 from moving forward and backward, thereby enhancing the stability of the installation between the guide head 2 and the drill collar 1. Two additional first sealing rings 23 are positioned between the first support member 215 and the stepped surface 111, and two additional second sealing rings 24 are positioned between the pin assembly 8 and the elastic gasket 3 to further enhance the sealing effect and provide a good sealing effect. In other embodiments, one, two, or more first and second sealing rings 23, 24 may be provided, without limitation herein, and may be provided as needed.

[0065] like Figure 3 、 Figure 4 and Figure 6As shown, the connector body 22 includes a pin portion 221 and a connecting portion 222 connected to the pin portion 221. The pin portion 221 is provided with a flow channel pin 2211. The connecting portion 222 is provided with a second pin hole 2222 for receiving a pin assembly 8. The pin assembly 8 is electrically connected to the flow channel pin 2211 of the pin portion 221. The flow channel pin 2211 electrically mates with a docking pin (not shown) of a docking component to transmit electrical signals. Bus signals are transmitted from the drill collar 1 to the pin assembly 8 and then to the docking pin via the flow channel pin 2211. The pin portion 221 is covered with an elastic gasket 3 that abuts the connecting shell 21 in the front-to-back direction. A third through hole 31 is formed between the elastic gasket 3 and the pin portion 221 and communicates with the first through hole 12 and the second through hole 213. Among them, the flow channel pin 2211 of the pin part 221 is used to transmit electrical signals and is connected to the docking pin. Fluid scouring and vibration of the drill collar 1 can easily affect the electrical connection stability between the flow channel pin 2211 and the docking pin. Therefore, it is necessary to reduce the scouring effect of the fluid flowing through the pin part 221. By sleeved on the pin part 221 with the elastic gasket 3, when the fluid flows through the third through hole 31, the vibration of the pin part 221 and the impact of fluid scouring can be buffered and reduced by the vibration damping effect of the elastic gasket 3, thereby ensuring that the flow channel pin 2211 and the docking pin have good electrical connection stability.

[0066] like Figure 3 、 Figure 4 and Figure 6 As shown, the pin portion 221 protrudes rearwardly from the connection housing 21, and the elastic gasket 3 protrudes rearwardly from the pin portion 221. This allows for a greater elastic margin when the elastic gasket 3 is elastically deformed forward by the locking force, thereby providing a greater length to protect the pin portion 221. In this embodiment, the length of the elastic gasket 3 protruding rearward from the pin portion 221 is greater than 10 mm. This provides sufficient elastic margin when the elastic gasket 3 is abutted by the docking housing 9, ensuring that the elastic gasket 3 still protrudes rearwardly from the pin portion 221 after final elastic compression, thereby better protecting the pin portion 221. The elastic gasket 3 extends forward beyond the channel pin 2211. Since the channel pin 2211 is electrically connected to the docking pin, the elastic gasket 3 is arranged to extend beyond the channel pin 2211 in the front-to-back direction to further protect the channel pin 2211, so as to further buffer and reduce the vibration of the pin portion 221 and reduce the impact of fluid scouring, thereby ensuring that the channel pin 2211 and the docking pin have good electrical connection stability.

[0067] like Figure 9As shown, the outer cover of the locating pin 4 is provided with a first elastic ring 5 and a second elastic ring 6 spaced apart in the vertical direction. The locating pin 4 is correspondingly provided with two spaced apart receiving grooves to accommodate the first elastic ring 5 and the second elastic ring 6, respectively. The first elastic ring 5 abuts between the locating pin 4 and the wall of the first positioning hole 13, and the second elastic ring 6 abuts between the locating pin 4 and the wall of the second positioning hole 2221. At this time, the locating pin 4 is connected to the drill collar 1 via the first elastic ring 5, and the locating pin 4 is connected to the guide head 2 via the second elastic ring 6, so as to further enhance the radial positioning function of the locating pin 4. During assembly, the locating pin 4 can also be provided with a vibration damping and buffering effect of the rigid positioning of the mating surface 211 of the guide head 2 and the stepped surface 111 of the drill collar 1, as well as the elastic extrusion force when the elastic gasket 3 is elastically deformed, thereby preventing the locating pin 4 from being squeezed and deformed during assembly. The locating pin 4 is provided with a downwardly recessed threaded hole 41 to facilitate maintenance and disassembly.

[0068] like Figure 3 、 Figure 4 and Figure 8 As shown, the pin assembly 8 is arranged behind the locating pin 4 and includes a male pin 81 and a female pin 82. The male pin 81 is installed in the second pin hole 2222, and the female pin 82 passes through the first pin hole 15 to electrically connect with the male pin 81. In the prior art, the pin assembly 8 requires a certain insertion and extraction force to resist downhole vibration, which may cause the male and female pins 81 and 82 to loosen and fail. Insertion and extraction force testing shows that the insertion force of this embodiment ranges from 4.77 to 5.77 N, and the separation force ranges from 4.13 to 4.72 N.

[0069] During installation, first install the first support member 215, the second support member 216, the first sealing ring 23, the second sealing ring 24, the male pin 81, the flow channel pin 2211, etc. on the guide head 2, and the guide head 2 enters the first through hole 12 from the back to the front until the mating surface 211 abuts against the step surface 111 to stop it in position. At this time, the first positioning hole 13 and the second positioning hole 2221 are radially aligned, and the first pin hole 15 and the second pin hole 2222 are radially aligned. Then, the positioning pin 4 with the first elastic ring 5 and the second elastic ring 6 passes radially through the first positioning hole 13 and is inserted into the second positioning hole 2221. , and dock the female pin 82 with the male pin 81 in the radial direction, and fix the female pin 82 to the male pin 81 by two screws, install the cover plate 7 with the sealing ring in the mounting groove 14 and fix it to the drill collar 1 by screws, and then the elastic gasket 3 enters the first through hole 12 from the back to the front, so that the first abutting surface 32 of the elastic gasket 3 abuts the third abutting surface 214 of the connecting shell 21, and finally screw the docking shell 9 into the first through hole 12 and abut against the elastic gasket 3 in the front-to-back direction, so that the elastic gasket 3 is elastically compressed forward and pressed against the connecting shell 21, thereby fastening the guide head 2 to the drill collar 1.

[0070] The above are only some embodiments of the present invention. It should be pointed out that for ordinary technicians in this field, other variations and improvements can be made without departing from the creative concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A guide head installation structure, characterized in that: include: A drill collar is provided with a first hole wall extending along a first direction, the first hole wall enclosing a first through hole for fluid to pass through, and the first hole wall is convexly provided with a step surface; A flow guide head is installed in the first through hole and is provided with a mating surface that cooperates with the step surface stopper, and a second through hole is provided in the flow guide head that is in communication with the first through hole; an elastic gasket installed in the first through hole and abutting against the guide head along the first direction, the step surface facing the elastic gasket along the first direction, and the elastic gasket elastically deforming toward the step surface along the first direction under the action of a locking force to fasten the guide head to the drill collar; The elastic gasket is provided with a first abutting surface and a second abutting surface spaced apart along the first direction; the flow guide is provided with a third abutting surface opposite to the first abutting surface along the first direction; the drill collar is provided with a locking structure for lockingly cooperating with the docking shell; the second abutting surface is used to abut against the docking shell; during the locking process of the drill collar and the docking shell, the second abutting surface abuts against the docking shell and is elastically deformed toward the step surface along the first direction by the locking force of the drill collar and the docking shell to fasten the flow guide to the drill collar; The size range of the step surface protruding inward toward the first through hole relative to the first hole wall is 1-5mm, and the matching height range between the mating surface and the step surface is 0.5-5mm; the step surface is a conical step surface; the mating surface is a conical mating surface matching the conical step surface; the conical angle range of the conical step surface and the conical mating surface is both 5-20 degrees, and the length range of the conical slope is 5-30mm.

2. The guide head mounting structure according to claim 1, wherein: It also includes a positioning pin located between the step surface and the elastic gasket, the drill collar is provided with a first positioning hole arranged along the second direction, the guide head is provided with a second positioning hole connected to the first positioning hole, the positioning pin passes through the first positioning hole along the second direction and is inserted into the second positioning hole, the positioning pin outer sleeve is provided with a first elastic ring and a second elastic ring spaced apart along the second direction, the first elastic ring abuts between the positioning pin and the hole wall of the first positioning hole, the second elastic ring abuts between the positioning pin and the hole wall of the second positioning hole, and the second direction is not parallel to the first direction.

3. The guide head installation structure according to claim 1, characterized in that: A ratio of a length of the elastic gasket along the first direction to a diameter of the first through hole is greater than 0.

5.

4. The guide head installation structure according to claim 1, characterized in that: The guide head includes a connecting shell that cooperates with the first hole wall and a joint body connected to the connecting shell. The second through hole is provided in the connecting shell. The joint body is protruded inwardly relative to the drill collar in the second through hole. The joint body includes a pin portion. The pin portion is outer-circuited with the elastic gasket that abuts the connecting shell along the first direction. A third through hole that communicates with the first through hole and the second through hole is formed between the elastic gasket and the pin portion.

5. The guide head mounting structure according to claim 4, characterized in that: The first direction is the front-to-back direction, the pin portion protrudes rearward from the connection shell, and the elastic gasket protrudes rearward from the pin portion; the pin portion is provided with a flow channel pin, and the elastic gasket extends forward beyond the flow channel pin.

6. The guide head mounting structure according to claim 4, characterized in that: The first direction is the front-to-back direction. The outer wall of the connecting shell is provided with a first support member and a second support member. The first support member and the second support member are abutted between the connecting shell and the drill collar. The first support member and the second support member are respectively located on the front and back sides of the step surface.

7. The guide head installation structure according to claim 6, characterized in that: The connector body also includes a connecting portion connected to the pin portion, the connecting portion is equipped with a pin assembly located between the step surface and the elastic gasket, the pin assembly is electrically connected to the flow channel pin of the pin portion, and a plurality of first sealing rings and second sealing rings are also sleeved on the outside of the connecting shell, the first sealing ring and the first support are both located on the front side of the pin assembly and the step surface, and the first sealing ring and the first support are both located on the rear side of the pin assembly and the step surface; the first support is recessed with a first groove, the first groove accommodates the first sealing ring, the first sealing ring abuts between the first support and the first hole wall, the second support is recessed with a second groove, the second groove accommodates the second sealing ring, and the second sealing ring abuts between the first support and the first hole wall.

8. The guide head mounting structure according to claim 1, wherein: The elastic gasket has an abutting portion and a yielding portion which are spaced apart along the circumferential direction. The abutting portion abuts against the first hole wall, and a gap is formed between the yielding portion and the first hole wall.

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