Telescopic tool for drill string
By designing a drill string telescopic tool including converter joints, casings, telescopic sleeves, rotary sleeves and impellers, the high-pressure drilling fluid drives the rotation sleeve to achieve the up and down reciprocating movement of the telescopic sleeves, which solves the drill strings and wells in complex structure wells The problem of large wall friction resistance torque improves drilling efficiency and tool stability.
Patent Information
- Application Number
- CN202310755302.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-26
- Publication Date
- 2024-12-27
AI Technical Summary
During the drilling process of complex structural wells, the frictional torque between the drill string and the well wall increases, resulting in low drilling pressure transfer efficiency and unstable screw tool surface. It is difficult to achieve effective expansion and contraction of the drill string in ultra-long horizontal well sections, especially in ultra-long horizontal well sections. , affects drilling efficiency.
A drill string telescopic tool including converter joints, casings, telescopic sleeves, rotary sleeves and impellers is designed. The rotary sleeves are rotated continuously through the impact of high-pressure drilling fluid, driving the telescopic sleeves to achieve up and down reciprocating motion, reducing drill strings and wells The friction resistance and torque of the wall improve load transfer efficiency.
The axial telescopic movement of the drill string is realized, the friction resistance and torque between the drill string and the well wall is reduced, the mechanical drilling speed and the stability of the screw tool surface are improved, and it is suitable for the safe and rapid drilling of complex structural wells.
Smart Images
Figure CN119195680A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of supporting equipment for drilling, and is a drill string telescopic tool. Background Art
[0002] As the difficulty of oil and gas extraction increases, my country has stepped up the development of deep-layer, offshore oil and gas and unconventional oil and gas resources. Complex structure well technologies represented by directional wells, horizontal wells and extended reach wells are the main well types for the development of the above oil and gas resources. In the drilling process of complex structure wells, sliding directional drilling is required frequently. During this process, the drill string does not rotate, and the friction torque between the drill string and the well wall increases sharply, making it impossible to effectively transmit the drilling pressure to the drill bit, resulting in low mechanical drilling speed and unstable screw tool face, which seriously affects the drilling efficiency of complex structure wells.
[0003] In response to the above engineering problems, studies have shown that by applying axial excitation to the drill string, the friction between the drill string and the well wall can be significantly reduced, and the drilling pressure transmission efficiency can be improved. Based on this, domestic and foreign scholars have proposed a variety of drill string excitation tools such as throttling, self-excited oscillation, and jet. Although these tools can be extended by themselves, they need to rely on the axial compression force of the drill string to restore it to its original state (i.e. shorten), which is difficult to achieve for well sections and working conditions with low axial pressure on the drill string (such as ultra-long horizontal well sections).
[0004] At present, it is urgent for technical personnel in this field to develop a vibration tool that can extend and shorten itself at the same time, so as to further improve the adaptability of the vibration tool in working conditions such as ultra-long horizontal well sections and maximize the load transfer efficiency of the drill string. Summary of the invention
[0005] The present invention provides a drill string telescopic tool, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problems of difficulty in transmitting drilling pressure and low mechanical drilling speed and stability of the tool face of the screw drill tool in existing complex structure wells due to high friction between the drill string and the well wall.
[0006] The technical solution of the present invention is achieved through the following measures: a drill string telescopic tool, including a conversion joint, a casing, a telescopic sleeve, a rotating sleeve and an impeller, the outer side of the lower end of the conversion joint is sealed and fixedly installed with the inner side of the upper end of the casing, the inner side of the conversion joint is sequentially sleeved with the telescopic sleeve and the rotating sleeve from the outside to the inside, the inner side of the lower part of the casing is fixed with an inner ring platform sleeved on the outer side of the lower part of the telescopic sleeve, the outer side of the telescopic sleeve corresponding to the position between the upper end of the inner ring platform and the lower end of the conversion joint is fixed with an outer ring platform, an annular upper telescopic cavity is formed between the upper end of the outer ring platform, the lower end of the conversion joint, the inner side of the casing and the outer side of the telescopic sleeve, an annular lower telescopic cavity is formed between the lower end of the outer ring platform, the upper end of the inner ring platform, the inner side of the casing and the outer side of the telescopic sleeve, and the upper end of the casing is fixed with an outer ring platform. At least one upper breathing hole is arranged at intervals along the circumference on the outer side of the sleeve, and each upper breathing hole is communicated with the upper telescopic chamber; at least one lower breathing hole is arranged at intervals along the circumference on the outer side of the lower part of the sleeve, and each lower breathing hole is communicated with the lower telescopic chamber; the rotating sleeve is a cylindrical structure with a closed upper end and an open lower end; an impeller is fixed to the outer side of the upper end of the rotating sleeve corresponding to the position above the telescopic sleeve; a plurality of liquid inlet holes connected inside and outside are distributed at intervals along the circumference on the outer side of the upper part of the rotating sleeve corresponding to the position between the impeller and the telescopic sleeve; upper communicating holes and lower communicating holes are arranged at intervals from top to bottom on the inner side of the lower part of the rotating sleeve; a switch flow channel is arranged on the inner side of the lower part of the sleeve, which can make the upper communicating hole and the upper telescopic chamber, and the lower communicating hole and the lower telescopic chamber alternately connected when the rotating sleeve rotates.
[0007] The following are further optimizations and / or improvements to the above technical solutions: As a preference, the above-mentioned switch flow channel may include a first telescopic hole and a second telescopic hole, a first telescopic hole connected to an upper telescopic cavity is provided on the inner side of the upper part of the telescopic sleeve corresponding to the position of the upper connecting hole, and a second telescopic hole symmetrically arranged with the first telescopic hole and connected to the lower telescopic cavity is provided on the inner side of the lower part of the telescopic sleeve corresponding to the position of the lower connecting hole.
[0008] The first telescopic hole and the second telescopic hole may have the same specifications and their projections on the horizontal plane may form a semicircular ring shape.
[0009] As another preferred embodiment, the switch flow channel may include a third telescopic hole and a fourth telescopic hole of the same specifications, at least two third telescopic holes are provided on the inner side of the upper part of the telescopic sleeve corresponding to the position of the upper connecting hole along the circumferential interval, each of the third telescopic holes is connected to the upper telescopic cavity, and at least two fourth telescopic holes are provided on the inner side of the lower part of the telescopic sleeve corresponding to the position of the lower connecting hole, each of the fourth telescopic holes is connected to the lower telescopic cavity, and the projections of the fourth telescopic holes and the third telescopic holes on the horizontal plane alternate with each other along the circumferential direction.
[0010] The fourth telescopic hole and the third telescopic hole may be projected in a fan-shaped shape on a horizontal plane, and the side contour lines of the fourth telescopic hole projected on the horizontal plane coincide with the side contour lines of the third telescopic hole at an adjacent position projected on the horizontal plane.
[0011] A first seal may be provided between the outer side of the outer ring platform and the inner side of the sleeve, a second seal may be provided between the inner side of the lower part of the conversion joint corresponding to the position above the upper telescopic cavity and the outer side of the upper part of the telescopic sleeve, a third seal may be provided between the inner side of the upper part of the telescopic sleeve and the outer side of the upper part of the rotating sleeve corresponding to the position above the upper communicating hole, a fourth seal may be provided between the inner side of the telescopic sleeve and the outer side of the rotating sleeve corresponding to the position between the lower part of the upper communicating hole and the upper part of the lower communicating hole, a fifth seal may be provided between the inner side of the inner ring platform corresponding to the position below the lower telescopic cavity and the outer side of the lower part of the telescopic sleeve, and a sixth seal may be provided between the inner side of the lower part of the telescopic sleeve and the outer side of the lower part of the rotating sleeve corresponding to the position below the lower communicating hole.
[0012] A torque transmission ring can be fixed on the inner side of the lower end of the sleeve corresponding to the position below the fifth sealing member. A hexagonal torque hole penetrating from top to bottom is provided in the center of the torque transmission ring. The lower end of the telescopic sleeve and the upper end of the hollow torque rod matching the torque hole on the outside are fixedly installed together, and a lower joint is fixedly installed on the lower end of the torque rod corresponding to the position below the torque transmission ring.
[0013] The outer side of the upper part of the rotating sleeve corresponding to the position above the third seal may have a first step surface, and a first bearing sleeved between the rotating sleeve and the telescopic sleeve is provided on the first step surface. The outer side of the lower part of the rotating sleeve corresponding to the position below the sixth seal has a second step surface, and a second bearing sleeved on the outer side of the lower part of the rotating sleeve is provided between the second step surface and the upper end of the torque rod.
[0014] The upper part of the central axis of the above-mentioned liquid inlet hole is inclined outwardly relative to the lower part, and a clamping nut is screwed on the outer side of the upper part of the rotating sleeve corresponding to the upper end of the impeller. The outer side of the upper end of the rotating sleeve corresponding to the position above the clamping nut is a conical surface with a small upper part and a large lower part, and an upper joint is fixedly installed on the upper end of the conversion joint.
[0015] The invention has a reasonable and compact structure. When in use, the conversion joint is connected to the upper drill string, the lower end of the telescopic sleeve is connected to the lower drill string, the high-pressure drilling fluid flows into the conversion joint through the drill string, the high-pressure drilling fluid impacts the impeller to make the rotating sleeve rotate continuously, and then the high-pressure drilling fluid flows into the inner side of the rotating sleeve through the liquid inlet hole. The impeller rotates continuously under the flushing of the high-pressure drilling fluid, thereby driving the rotating sleeve to rotate continuously. Every time the rotating sleeve rotates one circle, the upper connecting hole and the upper telescopic cavity, the lower connecting hole and the lower telescopic cavity can be alternately connected at least once, so that the telescopic sleeve and the lower drill string can reciprocate up and down regularly. The invention has the characteristics of few moving parts, easy use, safety and reliability, low pressure consumption, no influence on the drilling tool structure, applicable to various drilling platforms, and low processing, manufacturing and use and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure of the first embodiment.
[0017] Attached Figure 2 For attachment Figure 1Schematic diagram of the enlarged cross-sectional structure at AA in the middle.
[0018] Attached Figure 3 For attachment Figure 1 Schematic diagram of the enlarged cross-section structure at the middle BB.
[0019] Attached Figure 4 For attachment Figure 1 Schematic diagram of the enlarged cross-sectional structure at CC in the middle.
[0020] Attached Figure 5 It is a schematic diagram of the unfolded structure of the outer side surface of the rotating sleeve in the first embodiment.
[0021] Attached Figure 6 It is a schematic diagram of the unfolded structure of the inner side of the telescopic sleeve in the second embodiment.
[0022] Attached Figure 7 It is a schematic diagram of the unfolded structure of the inner side of the telescopic sleeve in the third embodiment.
[0023] Attached Figure 8 It is a schematic diagram of the unfolded structure of the inner side surface of the telescopic sleeve with three third telescopic holes in the third embodiment.
[0024] The codes in the accompanying drawings are: 1 is a conversion joint, 2 is a sleeve, 3 is a telescopic sleeve, 4 is a rotating sleeve, 5 is an impeller, 6 is an inner ring platform, 7 is an outer ring platform, 8 is an upper telescopic chamber, 9 is a lower telescopic chamber, 10 is an upper breathing hole, 11 is a lower breathing hole, 12 is a liquid inlet hole, 13 is an upper connecting hole, 14 is a lower connecting hole, 15 is a first telescopic hole, 16 is a second telescopic hole, 17 is a third telescopic hole, 18 is a fourth telescopic hole, 19 is a first seal, 20 is a second seal, 21 is a third seal, 22 is a fourth seal, 23 is a fifth seal, 24 is a sixth seal, 25 is a torque transmission ring platform, 26 is a torque rod, 27 is a lower joint, 28 is a first bearing, 29 is a second bearing, 30 is an upper joint, and 31 is a clamping nut. DETAILED DESCRIPTION
[0025] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.
[0026] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.
[0027] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figure 1 , 2As shown in Figures 3 and 5, the drill string telescopic tool comprises a conversion joint 1, a casing 2, a telescopic sleeve 3, a rotating sleeve 4 and an impeller 5. The outer side of the lower end of the conversion joint 1 is sealed and fixedly installed with the inner side of the upper end of the casing 2. The inner side of the conversion joint 1 is sequentially sleeved with the telescopic sleeve 3 and the rotating sleeve 4 from the outside to the inside. The inner side of the lower part of the casing 2 is fixed with an inner ring platform 6 sleeved on the outer side of the lower part of the telescopic sleeve 3. The outer side of the telescopic sleeve 3 is fixed with an outer ring platform 7 corresponding to the position between the upper end of the inner ring platform 6 and the lower end of the conversion joint 1. An annular upper telescopic cavity 8 is formed between the upper end of the outer ring platform 7, the lower end of the conversion joint 1, the inner side of the casing 2 and the outer side of the telescopic sleeve 3. An annular lower telescopic cavity 9 is formed between the lower end of the outer ring platform 7, the upper end of the inner ring platform 6, the inner side of the casing 2 and the outer side of the telescopic sleeve 3. The outer side of the upper part of the casing 2 is arranged at intervals along the circumference. There is at least one upper breathing hole 10, each of which is connected to the upper telescopic chamber 8. At least one lower breathing hole 11 is arranged at intervals along the circumference on the outer side of the lower part of the sleeve 2, and each lower breathing hole 11 is connected to the lower telescopic chamber 9. The rotating sleeve 4 is a cylindrical structure with a closed upper end and an open lower end. An impeller 5 is fixed to the outer side of the upper end of the rotating sleeve 4 corresponding to the position above the telescopic sleeve 3. A plurality of liquid inlet holes 12 connected inside and outside are distributed at intervals along the circumference on the outer side of the upper part of the rotating sleeve 4 corresponding to the position between the impeller 5 and the telescopic sleeve 3. Upper connecting holes 13 and lower connecting holes 14 are arranged at intervals on the inner side of the lower part of the rotating sleeve 4. A switch flow channel is arranged on the inner side of the lower part of the sleeve 2, which can make the upper connecting hole 13 and the upper telescopic chamber 8, and the lower connecting hole 14 and the lower telescopic chamber 9 alternately connected when the rotating sleeve 4 rotates.
[0028] When in use, the conversion joint 1 is connected to the upper drill string, the lower end of the telescopic sleeve 3 is connected to the lower drill string, the high-pressure drilling fluid drill string flows into the conversion joint 1, the high-pressure drilling fluid impacts the impeller 5 to make the rotating sleeve 4 rotate continuously, and then the high-pressure drilling fluid flows into the inner side of the rotating sleeve 4 through the liquid inlet hole 12.
[0029] When the switch flow channel rotates under the rotation of the rotating sleeve 4 so that the upper connecting hole 13 and the upper telescopic chamber 8 are connected and the lower connecting hole 14 and the lower telescopic chamber 9 are not connected, the high-pressure drilling fluid flows into the upper telescopic chamber 8 through the upper connecting hole 13 and the switch flow channel. At this time, the high-pressure drilling fluid generates high pressure on the upper end surface of the outer ring platform 7, while the lower end surface of the outer ring platform 7 is only affected by the low-pressure fluid pressure, so that the outer ring platform 7 moves downward, and the downward movement of the outer ring platform 7 drives the telescopic sleeve 3 and the lower drill string to move downward.
[0030] When the switch flow channel makes the lower connecting hole 14 and the lower telescopic chamber 9 connected and the upper connecting hole 13 and the upper telescopic chamber 8 disconnected under the rotation of the rotating sleeve 4, the high-pressure drilling fluid flows into the lower telescopic chamber 9 through the lower connecting hole 14 and the switch flow channel. At this time, the high-pressure drilling fluid generates high pressure on the lower end surface of the outer ring platform 7, and the upper end surface of the outer ring platform 7 is only affected by the low-pressure fluid, so that the outer ring platform 7 moves upward and then resets. The upward movement of the outer ring platform 7 drives the telescopic sleeve 3 and the lower drill string to move upward, and so on. The impeller 5 rotates continuously under the flushing of the high-pressure drilling fluid, thereby driving the rotating sleeve 4 to rotate continuously. Every time the rotating sleeve 4 rotates one circle, the upper connecting hole 13 and the upper telescopic chamber 8, the lower connecting hole 14 and the lower telescopic chamber 9 can be alternately connected at least once, so as to realize the regular up and down reciprocating motion of the telescopic sleeve 3, the upper pipe string and the lower drill string.
[0031] The invention has a reasonable and compact structure, has the characteristics of few moving parts, easy use, safety and reliability, low pressure loss, no influence on the drill tool structure, applicability to a variety of drilling platforms, and low processing, manufacturing, use and maintenance costs. The tool can drive the drill string connected thereto to produce axial telescopic movement, thereby reducing the friction and torque between the drill string and the well wall, improving the load transmission efficiency of the drill string, the mechanical drilling speed and the stability of the tool face of the screw drill tool, and can be applied to the safe and rapid drilling of horizontal well sections and large displacement well sections in wells with complex structures.
[0032] The drill string telescopic tool can be further optimized and / or improved according to actual needs: Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in Figures 3, 5 and 6, the switch flow channel includes a first telescopic hole 15 and a second telescopic hole 16. A first telescopic hole 15 connected to the upper telescopic chamber 8 is provided on the inner side of the upper portion of the telescopic sleeve 3 corresponding to the position of the upper connecting hole 13. A second telescopic hole 16 symmetrically arranged with the first telescopic hole 15 and connected to the lower telescopic chamber 9 is provided on the inner side of the lower portion of the telescopic sleeve 3 corresponding to the position of the lower connecting hole 14. The first telescopic hole 15 and the second telescopic hole 16 have the same specifications and their projections on the horizontal plane can form a semicircular ring shape of a ring.
[0033] During use, the first telescopic hole 15 and the second telescopic hole 16 have the same specifications and their projections on the horizontal plane can form a semicircular ring. The impeller 5 rotates continuously under the flushing of high-pressure drilling fluid, thereby driving the rotating sleeve 4 to rotate continuously. Each time the rotating sleeve 4 rotates one circle, the upper connecting hole 13 and the upper telescopic chamber 8, the lower connecting hole 14 and the lower telescopic chamber 9 can be connected once, respectively, so that the telescopic sleeve 3 and the lower drill string reciprocate up and down once. Thereby reducing the friction between the drill string and the well wall, improving the load transfer efficiency, mechanical drilling speed and the stability of the screw tool face.
[0034] Embodiment 3: As an optimization of Embodiment 1, as shown in the attached Figure 1 ,2 As shown in Figures 3, 5, 7 and 8, the switch flow channel includes a third telescopic hole 17 and a fourth telescopic hole 18 of the same specification. At least two third telescopic holes 17 are provided on the inner side of the upper part of the telescopic sleeve 3 corresponding to the position of the upper connecting hole 13, and each third telescopic hole 17 is communicated with the upper telescopic cavity 8. At least two fourth telescopic holes 18 are provided on the inner side of the lower part of the telescopic sleeve 3 corresponding to the position of the lower connecting hole 14, and each fourth telescopic hole 18 is communicated with the lower telescopic cavity 9. The projections of the fourth telescopic holes 18 and the third telescopic holes 17 on the horizontal plane alternate with each other along the circumferential direction.
[0035] During use, through such an arrangement, the impeller 5 rotates continuously under the flushing of the high-pressure drilling fluid, thereby driving the rotating sleeve 4 to rotate continuously. For each rotation of the rotating sleeve 4, the upper connecting hole 13 and the upper telescopic chamber 8, the lower connecting hole 14 and the lower telescopic chamber 9 can be connected at least twice, so that the telescopic sleeve 3 and the lower drill string reciprocate up and down at least twice. When the number of the third telescopic holes 17 is two, the upper connecting hole 13 and the upper telescopic chamber 8, the lower connecting hole 14 and the lower telescopic chamber 9 can be connected twice, so that the telescopic sleeve 3 and the lower drill string reciprocate up and down twice. When the number of the third telescopic holes 17 is three, the upper connecting hole 13 and the upper telescopic chamber 8, the lower connecting hole 14 and the lower telescopic chamber 9 can be connected three times, so that the telescopic sleeve 3 and the lower drill string reciprocate up and down three times, thereby reducing the friction between the drill string and the well wall, and improving the load transfer efficiency, mechanical drilling speed and stability of the screw tool face.
[0036] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2 As shown in Figures 3, 5, 7 and 8, the projections of the fourth telescopic hole 18 and the third telescopic hole 17 on the horizontal plane are both fan-shaped, and the side contour lines of the fourth telescopic hole 18 projected on the horizontal plane coincide with the side contour lines of the third telescopic hole 17 at the adjacent position projected on the horizontal plane.
[0037] During use, through such an arrangement, the upper connecting hole 13 is connected to the upper telescopic chamber 8 while the lower connecting hole 14 is not connected to the lower telescopic chamber 9, or the lower connecting hole 14 is connected to the lower telescopic chamber 9 while the upper connecting hole 13 is not connected to the upper telescopic chamber 8. This can increase the up and down movement distance of the outer ring platform 7 and increase the up and down movement distance of the casing 2 and the lower pipe column.
[0038] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1As shown, a first seal 19 is provided between the outer side of the outer ring platform 7 and the inner side of the sleeve 2, a second seal 20 is provided between the lower inner side of the conversion joint 1 corresponding to the upper position of the upper telescopic cavity 8 and the upper outer side of the telescopic sleeve 3, a third seal 21 is provided between the upper inner side of the telescopic sleeve 3 corresponding to the upper position of the upper communicating hole 13 and the upper outer side of the rotating sleeve 4, a fourth seal 22 is provided between the inner side of the telescopic sleeve 3 corresponding to the position between the lower part of the upper communicating hole 13 and the upper part of the lower communicating hole 14 and the outer side of the rotating sleeve 4, a fifth seal 23 is provided between the inner side of the inner ring platform 6 corresponding to the lower position of the lower telescopic cavity 9 and the lower outer side of the telescopic sleeve 3, and a sixth seal 24 is provided between the lower inner side of the telescopic sleeve 3 corresponding to the position below the lower communicating hole 14 and the lower outer side of the rotating sleeve 4. According to the requirements, the first seal 19, the second seal 20, the third seal 21, the fourth seal 22, the fifth seal 23 and the sixth seal 24 are all existing known technologies, such as O-rings. In the process of use, such a setting can improve the sealing performance.
[0039] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 , 4 As shown, a torque transmission ring 25 is fixed to the inner side of the lower end of the sleeve 2 corresponding to the position below the fifth sealing member 23, and a hexagonal torque hole penetrating from top to bottom is provided in the center of the torque transmission ring 25. The lower end of the telescopic sleeve 3 and the upper end of a hollow torque rod 26 matching the torque hole on the outside are fixedly installed together, and a lower joint 27 is fixedly installed at the lower end of the torque rod 26 corresponding to the position below the torque transmission ring 25.
[0040] According to the requirements, the torque hole is a regular octagon or a regular hexagon, and the outer side of the torque rod 26 is a regular octagon or a regular hexagon that matches the torque hole. During use, by setting the torque transmission ring 25, the casing 2 can transmit the torque of the upper joint 30 connecting the upper pipe string to the lower joint 27 during the up and down movement of the casing 2.
[0041] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the outer side of the upper portion of the rotating sleeve 4 corresponding to the position above the third sealing member 21 has a first step surface, and a first bearing 28 sleeved between the rotating sleeve 4 and the telescopic sleeve 3 is provided on the first step surface. The outer side of the lower portion of the rotating sleeve 4 corresponding to the position below the sixth sealing member 24 has a second step surface, and a second bearing 29 sleeved on the outer side of the lower portion of the rotating sleeve 4 is provided between the second step surface and the upper end of the torque rod 26.
[0042] During use, by providing the first bearing 28 and the second bearing 29, the impeller 5 can drive the rotating sleeve 4 to rotate more flexibly during the flushing process of the drilling fluid, so that the upper connecting hole 13 and the upper telescopic chamber 8, and the lower connecting hole 14 and the lower telescopic chamber 9 are alternately connected. The first bearing 28 and the second bearing 29 can also position the rotating sleeve 4.
[0043] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the upper part of the central axis of the liquid inlet hole 12 is inclined outward relative to the lower part, and a clamping nut 31 is screwed on the outer side of the upper part of the rotating sleeve 4 corresponding to the upper end position of the impeller 5, and the outer side of the upper end of the rotating sleeve 4 corresponding to the position above the clamping nut 31 is a conical surface with a smaller upper part and a larger lower part, and an upper joint 30 is fixedly installed on the upper end of the conversion joint 1.
[0044] During use, the central axis of the liquid inlet hole 12 is inclined from top to bottom and from outside to inside, which can make the drilling fluid flow into the rotating sleeve 4 quickly, avoiding the phenomenon that the speed of the impeller 5 is reduced due to the reduction of the flow rate of the drilling fluid. The outer side of the upper end of the rotating sleeve 4 corresponding to the position above the clamping nut 31 is a conical surface with a small top and a large bottom, which can make the drilling fluid flush the impeller 5 and increase the speed of the impeller 5. The outer side of the upper part of the rotating sleeve 4 at the upper end of the impeller 5 is screwed with a clamping nut 31, which is convenient for the disassembly and assembly of the impeller 5. The upper end of the conversion joint 1 is fixedly installed with an upper joint 30 for easy disassembly and assembly with the drill string, and the installation is simple and convenient.
[0045] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.
Claims
1. A drill string telescopic tool, characterized in that It includes a conversion joint, a sleeve, a telescopic sleeve, a rotating sleeve and an impeller. The outer side of the lower end of the conversion joint is sealed and fixedly installed with the inner side of the upper end of the sleeve. The inner side of the conversion joint is sequentially sleeved with the telescopic sleeve and the rotating sleeve from the outside to the inside. The inner side of the lower part of the sleeve is fixed with an inner ring platform sleeved on the outer side of the lower part of the telescopic sleeve. The outer side of the telescopic sleeve corresponding to the position between the upper end of the inner ring platform and the lower end of the conversion joint is fixed with an outer ring platform. An annular upper telescopic cavity is formed between the upper end of the outer ring platform, the lower end of the conversion joint, the inner side of the sleeve and the outer side of the telescopic sleeve. An annular lower telescopic cavity is formed between the lower end of the outer ring platform, the upper end of the inner ring platform, the inner side of the sleeve and the outer side of the telescopic sleeve. At least one is arranged at intervals along the circumference of the outer side of the upper part of the sleeve. Upper breathing holes, each of which is connected to the upper telescopic chamber, at least one lower breathing hole is arranged at intervals along the circumference on the outer side of the lower part of the sleeve, each of which is connected to the lower telescopic chamber, the rotating sleeve is a cylindrical structure with a closed upper end and an open lower end, an impeller is fixed to the outer side of the upper end of the rotating sleeve corresponding to the position above the telescopic sleeve, and a number of liquid inlet holes connected inside and outside are distributed at intervals along the circumference on the outer side of the upper part of the rotating sleeve corresponding to the position between the impeller and the telescopic sleeve, upper communicating holes and lower communicating holes are arranged at intervals on the inner side of the lower part of the rotating sleeve, and a switch flow channel is arranged on the inner side of the lower part of the sleeve, which can make the upper communicating holes and the upper telescopic chamber, and the lower communicating holes and the lower telescopic chamber alternately connected when the rotating sleeve rotates.
2. The drill string telescopic tool according to claim 1, characterized in that The switch flow channel includes a first telescopic hole and a second telescopic hole. A first telescopic hole connected to the upper telescopic cavity is provided on the inner side of the upper part of the telescopic sleeve corresponding to the position of the upper connecting hole. A second telescopic hole symmetrically arranged with the first telescopic hole and connected to the lower telescopic cavity is provided on the inner side of the lower part of the telescopic sleeve corresponding to the position of the lower connecting hole.
3. The drill string telescopic tool according to claim 2, characterized in that The first telescopic hole and the second telescopic hole have the same specifications and their projections on the horizontal plane can form a semicircular ring.
4. The drill string telescopic tool according to claim 1, characterized in that The switch flow channel includes a third telescopic hole and a fourth telescopic hole of the same specification. At least two third telescopic holes are arranged on the inner side of the upper part of the telescopic sleeve corresponding to the position of the upper connecting hole along the circumference, and each third telescopic hole is connected to the upper telescopic cavity. At least two fourth telescopic holes are arranged on the inner side of the lower part of the telescopic sleeve corresponding to the position of the lower connecting hole, and each fourth telescopic hole is connected to the lower telescopic cavity. The projections of the fourth telescopic holes and the third telescopic holes on the horizontal plane alternate with each other along the circumferential direction.
5. The drill string telescopic tool according to claim 4, characterized in that The projections of the fourth telescopic hole and the third telescopic hole on the horizontal plane are both fan-shaped, and the side contour lines of the fourth telescopic hole projected on the horizontal plane coincide with the side contour lines of the third telescopic hole at an adjacent position projected on the horizontal plane.
6. The drill string telescopic tool according to claim 1 or 2 or 3 or 4 or 5, characterized in that A first seal is provided between the outer side of the outer ring platform and the inner side of the sleeve, a second seal is provided between the inner side of the lower part of the conversion joint corresponding to the position above the upper telescopic cavity and the outer side of the upper part of the telescopic sleeve, a third seal is provided between the inner side of the upper part of the telescopic sleeve and the outer side of the upper part of the rotating sleeve corresponding to the position above the upper communicating hole, a fourth seal is provided between the inner side of the telescopic sleeve and the outer side of the rotating sleeve corresponding to the position between the lower part of the upper communicating hole and the upper part of the lower communicating hole, a fifth seal is provided between the inner side of the inner ring platform corresponding to the position below the lower telescopic cavity and the outer side of the lower part of the telescopic sleeve, and a sixth seal is provided between the inner side of the lower part of the telescopic sleeve and the outer side of the lower part of the rotating sleeve corresponding to the position below the lower communicating hole.
7. The drill string telescoping tool according to claim 6, characterized in that A torque transmission ring is fixed on the inner side of the lower end of the sleeve corresponding to the position below the fifth seal, and a hexagonal torque hole is provided in the center of the torque transmission ring, which passes through the upper and lower parts. The lower end of the telescopic sleeve and the upper end of the hollow torque rod matching the torque hole on the outside are fixedly installed together, and a lower joint is fixedly installed on the lower end of the torque rod corresponding to the position below the torque transmission ring.
8. The drill string telescoping tool according to claim 7, characterized in that The outer side of the upper part of the rotating sleeve corresponding to the position above the third seal has a first step surface, and the first step surface is provided with a first bearing sleeved between the rotating sleeve and the telescopic sleeve. The outer side of the lower part of the rotating sleeve corresponding to the position below the sixth seal has a second step surface, and a second bearing sleeved on the outer side of the lower part of the rotating sleeve is provided between the second step surface and the upper end of the torque rod.
9. The drill string telescopic tool according to claim 1 or 2 or 3 or 4 or 5 or 7 or 8, characterized in that The upper part of the central axis of the liquid inlet hole is inclined outwardly relative to the lower part, and a clamping nut is screwed on the outer side of the upper part of the rotating sleeve corresponding to the upper end of the impeller. The outer side of the upper end of the rotating sleeve corresponding to the position above the clamping nut is a conical surface with a small upper part and a large lower part, and an upper joint is fixedly installed on the upper end of the conversion joint.
10. The drill string telescoping tool according to claim 6, characterized in that The upper part of the central axis of the liquid inlet hole is inclined outwardly relative to the lower part, and a clamping nut is screwed on the outer side of the upper part of the rotating sleeve corresponding to the upper end of the impeller. The outer side of the upper end of the rotating sleeve corresponding to the position above the clamping nut is a conical surface with a small upper part and a large lower part, and an upper joint is fixedly installed on the upper end of the conversion joint.