Drill string wriggling tool

Abstract

The invention relates to the technical field of petroleum and natural gas well drilling corollary equipment, in particular to a drill column wriggling tool which comprises an upper connector, a sleeve, a lower connector, a mandrel, an impeller, a supporting column and a supporting assembly. The device is reasonable and compact in structure, when the device is used, the upper end of the upper connector is connected with an upper drill column, the lower end of the lower connector is connected with a lower drill column, drilling fluid enters the upper connector from the upper drill column and flows through the upper connector, the supporting assembly, a center hole of the upper valve disc, a flow guide groove of the rotating shaft and a flow guide hole, and then the impeller rotates under the impact effect of the drilling fluid; the rotating shaft is driven to rotate, so that the lower valve disc and the upper valve disc rotate relatively, an upper flow channel can periodically open or close a switch hole, a supporting column can periodically stretch out and retract, axial force is periodically transmitted to a lower connector, and the phenomena of dragging pressure and stick-slip generated in the drilling process of a high-friction-torsion well section are eliminated. And the gravity of the upper drill column can be smoothly transferred downwards, so that the rock breaking drilling efficiency of the drill bit is improved.

Description

Technical Field

[0001] The invention relates to the technical field of supporting equipment for oil and natural gas drilling, and is a drill string creeping 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-mentioned 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. Therefore, how to reduce the friction between the drill string and the well wall, smoothly transfer part of the weight of the upper drill string downward to the drill bit, and ensure that the drill bit efficiently breaks the rock is the key to the efficient development of oil and gas resources using complex structure wells.

[0003] At present, the general practice is to optimize the wellbore structure and mud performance, adopt measures such as rotary steerable drilling to reduce the friction between the drill string and the well wall, thereby increasing the mechanical drilling speed and the limit extension distance of the horizontal well section, but the above technical measures all have certain limitations. 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 various types of drill string excitation tools such as throttling type, self-excited oscillation type, and jet type, but these tools all have certain limitations. At present, the boundaries of traditional oil and gas technology are being broken, and cross-border innovation formed by combining traditional oil and gas technology with other disciplines will become a new driving force for the development of oil and gas technology. In bionic research, the legless creeping ability of earthworms is an ideal method to achieve motion control in a limited space. It has been widely used in fields such as seabed mineral drilling and biomedicine and has received great attention.

[0004] Inspired by the structure and movement principle of earthworms, the present invention proposes a structural unit that can enable the drill string to achieve earthworm-like creeping motion. Connecting multiple structural units in series in the drill string can achieve earthworm-like creeping motion, thereby realizing efficient transmission of drill string loads in complex structure wells. Summary of the invention

[0005] The present invention provides a drill string peristaltic tool, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the drill string does not rotate during the existing drill string sliding directional drilling process, the friction torque between the drill string and the well wall increases sharply, the drilling pressure cannot be effectively transmitted 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.

[0006] The technical scheme of the present invention is realized through the following measures: a drill string peristaltic tool, comprising an upper joint, a sleeve, a lower joint, a core shaft, an impeller, a support column and a support assembly, the lower end of the upper joint and the upper end of the sleeve are fixedly installed together, the lower joint that can rotate synchronously with the sleeve is slidably installed on the inner side of the lower part of the sleeve, the core shaft is sealingly and slidably installed on the inner side of the upper part of the sleeve, a first elastic reset part is installed between the core shaft and the inner side of the lower end of the sleeve, the lower end of the core shaft is provided with a lower flow channel opening downward, a rotating groove is provided in the center of the upper end of the core shaft, a rotating shaft is rotatably installed in the rotating groove, an impeller is fixedly installed on the outer side of the lower end of the rotating shaft, a plurality of water holes connected with the upper part of the lower flow channel are distributed at intervals along the circumference corresponding to the lower inner wall of the rotating groove below the impeller, a lower valve disc mounted on the inner side of the upper part of the rotating groove is fixedly installed on the outer side of the upper end of the rotating shaft, a guide groove opening upward is provided on the upper end of the rotating shaft, and a guide groove opening upward is provided at the corresponding position between the lower valve disc and the impeller. A plurality of guide holes connected with the guide groove are evenly distributed along the circumference on the outer side of the rotating shaft, a plurality of guide holes connected with the guide groove are evenly distributed along the circumference on the outer side of the rotating shaft, a plurality of guide holes connected with the guide groove are evenly distributed along the circumference on the upper side of the core shaft, an upper valve disc slidably installed in the upper joint, a central hole penetrating up and down is provided in the center of the upper valve disc, a plurality of upper flow channels penetrating up and down are evenly distributed along the circumference on the upper end of the upper valve disc, at least one switch hole penetrating up and down is evenly distributed along the circumference on the upper end of the lower valve disc, the switch hole is opened or closed simultaneously by the upper valve disc when the lower valve disc rotates, a plurality of radially penetrating sliding holes are evenly distributed along the circumference on the outer side of the middle part of the upper joint corresponding to the position above the upper valve disc, a support column is slidably installed in each sliding hole, a support assembly is provided between the upper end of the upper valve disc and the inner side of the upper part of the upper joint, the support assembly can make all the support columns extend outward or retract inward when moving up and down, the support assembly moves upward after the switch hole is closed by the upper valve disc, and moves downward after the switch hole is opened by the upper valve disc.

[0007] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned support assembly may include a support piston, a second elastic return member and a third elastic return member. A guide sleeve is fixed to the inner side of the upper part of the upper joint corresponding to the position above the support column. A sealing sleeve on the outer side of the guide sleeve is provided with a support piston whose outer side of the lower end is in sealing contact with the inner side of the upper joint. A second elastic return member is installed between the upper end of the support piston and the inner side of the upper joint, which can make the lower end of the support piston and the upper end of the upper valve disc abut against each other. The outer side of the middle part of the support piston has a conical guide surface which is smaller at the top and larger at the bottom. The inner end surface of each support column is an inclined surface matching the guide surface. A third elastic return member is installed between each support column and the sliding hole, which can make the inner end surface of the support column and the guide surface abut against each other.

[0008] A first outer ring platform can be fixed to the outer side of the upper end of the above-mentioned upper valve disc, and a second outer ring platform abutting against the upper end of the first outer ring platform is fixed to the outer side of the lower end of the supporting piston. The outer side of the second outer ring platform is in sealing contact with the inner side of the upper joint, and a first step surface is provided on the inner side of the upper joint corresponding to the position between the second outer ring platform and the supporting column. The sliding hole is a step hole that is small on the outside and large on the inside. A third outer ring platform is fixed to the outer side of the inner end of the supporting column, and the third elastic reset member is installed on the outer side of the supporting column between the third outer ring platform and the large diameter section of the sliding hole.

[0009] The outer side of the upper joint corresponding to the position between the lower side of the second elastic reset member and the upper side of the support column may be uniformly distributed along the circumference with at least one breathing hole communicating with the inside and the outside.

[0010] A torque sleeve with a regular polygonal cross-section is fixedly installed on the upper end of the above-mentioned lower joint, and a first inner ring platform is fixed on the inner side of the lower end of the sleeve. The inner side of the first inner ring platform matches the outer side of the torque sleeve, the outer side of the lower part of the core shaft is sleeved on the outer side of the upper part of the torque sleeve, and the first elastic reset part is sleeved on the outer side of the torque sleeve between the lower end of the core shaft and the upper end of the first inner ring platform.

[0011] The outer side of the upper end of the torque sleeve may be a conical surface with a smaller upper portion and a larger lower portion. The lower end of the core shaft is provided with a limiting groove matching the upper end of the torque sleeve, and the outer side of the upper end of the torque sleeve is sleeved in the limiting groove.

[0012] A second step surface may be provided on the outer side of the lower part of the core shaft corresponding to the position above the limiting groove, and a third step surface may be provided on the inner side of the upper part of the sleeve corresponding to the position below the second step surface, and the inner diameter of the third step surface is smaller than the outer diameter of the second step surface.

[0013] The lower portion of the central axis of the guide hole may be inclined outward relative to the upper portion.

[0014] The inner wall of the lower part of the rotating groove may be provided with a mounting groove opening upward, and a bearing is installed between the inner side of the mounting groove and the outer side of the lower end of the rotating shaft.

[0015] The structure of the present invention is reasonable and compact. When in use, the upper end of the upper joint is connected to the upper drill string, and the lower end of the lower joint is connected to the lower drill string. The drilling fluid enters the upper joint from the upper drill string, flows through the upper joint, the support assembly, the central hole of the upper valve disc, the guide groove and the guide hole of the rotating shaft, and the impeller rotates under the impact of the drilling fluid, thereby driving the rotating shaft to rotate, so that the lower valve disc and the upper valve disc rotate relatively, so that the upper flow channel can be periodically connected or the switch hole can be closed, the support column can be periodically extended and retracted, and the axial force can be periodically transmitted to the lower joint, so as to eliminate the "drag pressure" and "stick-slip" phenomena generated during the drilling of high-friction and torsional well sections, and the gravity of the upper drill string can be smoothly transmitted downward, so that the rock breaking drilling efficiency of the drill bit is improved. 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 1 Schematic 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 For attachment Figure 1 Schematic diagram of the enlarged cross-sectional structure at DD in the middle.

[0021] Attached Figure 6 For attachment Figure 1 Schematic diagram of the enlarged structure at E in the middle.

[0022] The codes in the accompanying drawings are: 1 is an upper joint, 2 is a sleeve, 3 is a lower joint, 4 is a core shaft, 5 is an impeller, 6 is a support column, 7 is a first elastic return member, 8 is a rotating groove, 9 is a lower flow channel, 10 is a water hole, 11 is a lower valve disc, 12 is a guide hole, 13 is an upper valve disc, 14 is a center hole, 15 is an upper flow channel, 16 is a switch hole, 17 is a supporting piston, 18 is a guide sleeve, 19 is a second elastic return member, 20 is a third elastic return member, 21 is a guide surface, 22 is a first outer ring platform, 23 is a second outer ring platform, 24 is a first step surface, 25 is a second step surface, 26 is a third outer ring platform, 27 is a breathing hole, 28 is a torque sleeve, 29 is a first inner ring platform, 30 is a third step surface, 31 is a bearing, 32 is a rotating shaft, and 33 is a guide groove. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As shown in the attached Figures 1 to 6As shown, the drill string creep tool comprises an upper joint 1, a sleeve 2, a lower joint 3, a core shaft 4, an impeller 5, a support column 6 and a support assembly. The lower end of the upper joint 1 and the upper end of the sleeve 2 are fixedly installed together, the lower joint 3 that can rotate synchronously with the sleeve 2 is slidably installed on the inner side of the lower part of the sleeve 2, the core shaft 4 is sealed and slidably installed on the inner side of the upper part of the sleeve 2, a first elastic reset member 7 is installed between the core shaft 4 and the inner side of the lower end of the sleeve 2, the lower end of the core shaft 4 is provided with a downwardly opening lower flow channel 9, and the upper end of the core shaft 4 is provided with a lower flow channel 9. A rotating groove 8 is provided in the center, a rotating shaft 32 is rotatably installed in the rotating groove 8, an impeller 5 is fixedly installed on the outer side of the lower end of the rotating shaft 32, a plurality of water holes 10 connected to the upper part of the lower flow channel 9 are distributed along the circumference at intervals on the inner wall of the lower part of the rotating groove 8 corresponding to the position below the impeller 5, a lower valve disc 11 is fixedly mounted on the inner side of the upper part of the rotating groove 8 on the outer side of the upper end of the rotating shaft 32, a guide groove 33 with an opening upward is provided on the upper end of the rotating shaft 32, and a guide groove 33 with an opening upward is provided on the outer side of the rotating shaft 32 corresponding to the position between the lower valve disc 11 and the impeller 5. A plurality of guide holes 12 connected to the guide groove 33 are evenly distributed at intervals around the circumference. The upper end of the core shaft 4 is provided with an upper valve disc 13 slidably mounted in the upper joint 1. A central hole 14 is provided in the center of the upper valve disc 13, and a plurality of upper flow channels 15 are evenly distributed along the circumference on the upper end of the upper valve disc 13. At least one switch hole 16 is evenly distributed along the circumference on the upper end of the lower valve disc 11. The switch hole 16 is opened or closed simultaneously by the upper valve disc 13 when the lower valve disc 11 rotates. Closed, a number of radially penetrating sliding holes are evenly distributed along the circumference on the outer side of the middle part of the upper joint 1 corresponding to the position above the upper valve disc 13, and a support column 6 is slidably installed in each sliding hole. A support component is provided between the upper end of the upper valve disc 13 and the inner side of the upper part of the upper joint 1, which can make all the support columns 6 extend outward or retract inward when moving up and down. The support component moves upward after the switch hole 16 is closed by the upper valve disc 13, and moves downward after the switch hole 16 is opened by the upper valve disc 13.

[0026] According to the requirements, the number of switch holes 16 is 1, the inner side of the lower end of the upper joint 1 and the outer side of the upper end of the sleeve 2 are fixed together by threads, and a sealing ring is provided between the outer side of the upper valve disc 13 and the inner side of the upper joint 1. When in use, the upper end of the upper joint 1 is connected to the upper drill string, and the lower end of the lower joint 3 is connected to the lower drill string. The drilling fluid enters the upper joint 1 from the upper drill string, flows through the upper joint 1, the support assembly, the center hole 14 of the upper valve disc 13, the guide groove 33 and the guide hole 12 of the rotating shaft 32, and then impacts the impeller 5. The impeller 5 rotates under the impact of the drilling fluid, thereby driving the rotating shaft 32 to rotate. When the rotating shaft 32 rotates, the lower valve disc 11 and the upper valve disc 13 rotate relative to each other. When the lower valve disc 11 rotates relative to the upper valve disc 13, the upper flow channel 15 can periodically open or close the switch hole 16.

[0027] When the switch hole 16 is closed, due to the water hammer effect, the drilling fluid pressure on the upper part of the upper valve disc 13 rises sharply, causing the pressure on the support assembly and the upper end surface of the upper valve disc 13 to increase sharply. On the one hand, it pushes the support assembly to move upward, causing the support column 6 to extend outward and press against the well wall. On the other hand, it pushes the upper valve disc 13, the core shaft 4, the rotating shaft 32 and the lower joint 3 to move downward, and the lower joint 3 transmits the axial force to the lower drill string to perform drilling operations.

[0028] When the switch hole 16 is opened, that is, the impeller 5 continues to rotate so that the upper flow channel 15 and the switch hole 16 are connected, the drilling fluid flows downward after passing through the switch hole 16, the water hammer effect is eliminated, and the pressure on the lower end surface of the support piston 17 and the upper end surface of the upper valve disc 13 is reduced. On the one hand, the support assembly moves downward under the action of the first elastic reset member 7, and the support column 6 retracts inward into the sliding hole. On the other hand, the core shaft 4 moves upward under the action of the first elastic reset member 7, that is, the upper valve disc 13 moves upward and then resets.

[0029] In this way, the support column 6 is periodically extended and retracted, and the axial force is periodically transmitted to the lower joint 3, which stimulates the drill string to produce axial creeping similar to that of an earthworm, so that the static contact and friction between the drill string and the well wall are eliminated, and the "drag pressure" and "stick-slip" phenomena generated during the drilling process of the high-friction and torsion well section are eliminated. The gravity of the upper drill string can be smoothly transmitted downward, forming an effective drilling pressure acting on the drill bit, so that the rock-breaking drilling efficiency of the drill bit is improved. The drill string can be extended periodically, and the friction between the upper half of the drill string and the well wall is used to push the lower half of the drill string to move toward the bottom of the well, thereby improving the drilling pressure transmission efficiency and the mechanical drilling speed. The present invention has a reasonable and compact structure, is easy to use, and has the characteristics of safety, labor saving, simplicity, and high efficiency.

[0030] The above drill string creeping 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 , 6 As shown, the support assembly includes a support piston 17, a second elastic return member 19 and a third elastic return member 20. A guide sleeve 18 is fixed to the inner side of the upper part of the upper joint 1 corresponding to the position above the support column 6. The outer sealing sleeve of the guide sleeve 18 is provided with a support piston 17 whose outer side of the lower end is in sealing contact with the inner side of the upper joint 1. A second elastic return member 19 is installed between the upper end of the support piston 17 and the inner side of the upper joint 1, which can make the lower end of the support piston 17 and the upper end of the upper valve disc 13 abut against each other. The outer side of the middle part of the support piston 17 has a conical guide surface 21 which is smaller at the top and larger at the bottom. The inner end surface of each support column 6 is an inclined surface matching the guide surface 21. A third elastic return member 20 is installed between each support column 6 and the sliding hole, which can make the inner end surface of the support column 6 and the guide surface 21 abut against each other.

[0031] According to the requirements, the second elastic reset member 19 and the third elastic reset member 20 both include a plurality of disc springs stacked in sequence. During use, by setting the second elastic reset member 19 and the third elastic reset member 20, the support piston 17 and the support column 6 can be reset. By setting the guide sleeve 18, the installation of the second elastic reset member 19 is facilitated, and the sealing between the guide sleeve 18 and the inner side of the support piston 17 is also facilitated. The support piston 17 can also play a guiding role. During the upward movement of the support piston 17, the extension amount of the support column 6 can be made consistent. The outer side of the middle part of the support piston 17 has a conical guide surface 21 that is small at the top and large at the bottom. The inner end surface of each support column 6 is an inclined surface matching the guide surface 21. When the support piston 17 moves upward, the support column 6 can be radially extended and abut against the well wall.

[0032] Embodiment 3: As an optimization of the above embodiment, as shown in the attached Figure 1 , 6 As shown, a first outer ring platform 22 is fixed to the outer side of the upper end of the upper valve disc 13, and a second outer ring platform 23 abutting against the upper end of the first outer ring platform 22 is fixed to the outer side of the lower end of the supporting piston 17. The outer side of the second outer ring platform 23 is in sealing contact with the inner side of the upper joint 1, and a first step surface 24 is provided on the inner side of the upper joint 1 corresponding to the position between the second outer ring platform 23 and the support column 6. The sliding hole is a step hole with a small outside and a large inside. A third outer ring platform 26 is fixed to the outer side of the inner end of the support column 6, and the third elastic reset member 20 is installed on the outer side of the support column 6 between the third outer ring platform 26 and the large diameter section of the sliding hole.

[0033] During use, by setting the first outer ring platform 22, there is a distance between the upper end of the upper valve disc 13 and the lower end of the support piston 17. When the switch hole 16 is closed, the drilling fluid in the upper joint 1 only flows into the guide groove 33. Due to the water hammer effect, the fluid acts on the lower end of the support piston 17 and the upper end of the upper valve disc 13, so that the support piston 17 moves upward, and finally the support column 6 extends out of the sliding hole of the upper joint 1. At the same time, the upper valve disc 13 moves downward, driving the core shaft 4 and the lower joint 3 to move downward, and finally the lower joint 3 moves downward, stimulating the drill string to produce axial creeping similar to that of an earthworm, so that the static contact and friction between the drill string and the well wall are eliminated. By setting the first step surface 24, the support piston 17 can be limited.

[0034] Embodiment 4: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, at least one breathing hole 27 communicating with the inside and outside is evenly distributed along the circumference on the outer side of the upper joint 1 corresponding to the position between the bottom of the second elastic reset member 19 and the top of the support column 6.

[0035] During use, when the switch hole 16 is closed, due to the water hammer effect, a part of the water flow acts on the lower end of the support piston 17, causing the support piston 17 to move upward, and then push the support column 6 to extend outward. When the switch hole 16 is opened, the fluid flows out through the guide groove 33 and the switch hole 16, and the support piston 17 moves downward to the initial position under the action of the second elastic reset member 19. At the same time, the support column 6 retracts into the sliding hole under the action of the third elastic reset member 20. By setting the breathing hole 27, the well fluid on the outside of the upper joint 1 can flow in to assist the second elastic reset member 19 to quickly move the support piston 17 down and restore it to the initial position, making the movement of the support piston 17 and the support column 6 more flexible.

[0036] Embodiment 5: As an optimization of the above embodiment, as shown in the attached Figure 1 , 5 As shown, a torque sleeve 28 with a regular polygonal cross-section is fixedly installed on the upper end of the lower joint 3, a first inner ring platform 29 is fixed on the inner side of the lower end of the sleeve 2, the inner side of the first inner ring platform 29 matches the outer side of the torque sleeve 28, the outer side of the lower part of the core shaft 4 is sleeved on the outer side of the upper part of the torque sleeve 28, and the first elastic reset member 7 is sleeved on the outer side of the torque sleeve 28 between the lower end of the core shaft 4 and the upper end of the first inner ring platform 29.

[0037] According to the requirements, the cross-sections of the outer side of the torque sleeve 28 and the inner side of the first inner ring platform 29 can be regular octagons or regular hexagons, and the first elastic reset member 7 is a plurality of disc springs stacked together from bottom to top. During use, by providing the first inner ring platform 29, it is convenient to install the first elastic reset member 7, and it is also convenient for the upper pipe string to drive the lower joint 3 and the lower drill string connected to the lower joint 3 to rotate through the upper joint 1, sleeve 2 and the first inner ring platform 29 during the movement of the core shaft 4 up and down on the outer side of the torque sleeve 28, so as to realize the downward transmission of torque.

[0038] Embodiment 6: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the outer side of the upper end of the torque sleeve 28 is a conical surface with a smaller upper part and a larger lower part. The lower end of the core shaft 4 is provided with a limiting groove matching the upper end of the torque sleeve 28, and the outer side of the upper end of the torque sleeve 28 is sleeved in the limiting groove.

[0039] According to the requirements, a distance is provided between the lower end surface of the first inner ring platform 29 and the upper end surface of the lower joint 3. During use, by providing the limit groove, the central axis of the torque sleeve 28 and the core shaft 4 can be made colinear, preventing the outer edges of the torque sleeve 28 from damaging the first elastic reset member 7 during the rotation process.

[0040] Embodiment 7: As an optimization of the above embodiment, as shown in the attached Figure 1 , 2As shown, a second step surface 25 is provided on the outer side of the lower part of the core shaft 4 corresponding to the position above the limiting groove, and a third step surface 30 is provided on the inner side of the upper part of the sleeve 2 corresponding to the position below the second step surface 25, and the inner diameter of the third step surface 30 is smaller than the outer diameter of the second step surface 25.

[0041] During use, through such an arrangement, the core shaft 4 can start the limiting function during the movement, thereby preventing the first elastic return member 7 from failing prematurely and extending the service life of the first elastic return member 7.

[0042] Embodiment 8: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the lower part of the central axis of the guide hole 12 is inclined outward relative to the upper part. During use, such an arrangement can reduce the flow rate of the drilling fluid when it flows through the guide hole 12, so that the drilling fluid can drive the impeller 5 to rotate when flushing the impeller 5, thereby driving the central axis and the lower valve disc 11 to rotate.

[0043] Embodiment 9: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the inner wall of the lower part of the rotating groove 8 is provided with an installation groove with an opening facing upward, and a bearing 31 is installed between the inner side of the installation groove and the outer side of the lower end of the rotating shaft 32. During use, through such an arrangement, when the drilling fluid flows through the impeller 5, the rotation of the rotating shaft 32 can be made more flexible.

[0044] Compared with the prior art, the present invention aims at the "drag and pressure" and "stick-slip" phenomena existing in the drilling process of high-friction well sections, utilizes the characteristic that vibration can affect the friction coefficient between friction pairs, and innovatively introduces the creeping principle of earthworms into the design of drilling tools, breaking through the limitations of conventional drag reduction measures, effectively reducing the friction and torque between the drill string and the well wall. It is effective and controllable, has broad application prospects, is suitable for a variety of drilling platforms, has low processing, manufacturing, use and maintenance costs, and has important practical significance for improving the drilling speed of high-friction well sections and reducing production costs.

[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 peristaltic tool, characterized in that The invention comprises an upper joint, a sleeve, a lower joint, a core shaft, an impeller, a support column and a support assembly. The lower end of the upper joint and the upper end of the sleeve are fixedly installed together, a lower joint which can rotate synchronously with the sleeve is slidably installed on the inner side of the lower part of the sleeve, a core shaft is sealingly and slidably installed on the inner side of the upper part of the sleeve, a first elastic reset part is installed between the core shaft and the inner side of the lower end of the sleeve, a lower flow channel opening downward is provided at the lower end of the core shaft, a rotating groove is provided at the center of the upper end of the core shaft, a rotating shaft is rotatably installed in the rotating groove, an impeller is fixedly installed on the outer side of the lower end of the rotating shaft, a plurality of water holes connected with the upper part of the lower flow channel are distributed along the circumference at intervals on the inner wall of the lower part of the rotating groove corresponding to the position below the impeller, a lower valve disc mounted on the inner side of the upper part of the rotating groove is fixedly installed on the outer side of the upper end of the rotating shaft, a guide groove opening upward is provided on the upper end of the rotating shaft, and the outer side of the rotating shaft corresponding to the position between the lower valve disc and the impeller is uniformly distributed along the circumference at intervals. There are several guide holes connected with the guide groove, and the upper end of the core shaft is provided with an upper valve disc slidably installed in the upper joint. A central hole is provided in the center of the upper valve disc, and several upper flow channels are evenly distributed along the circumference on the upper end of the upper valve disc, and at least one switch hole is evenly distributed along the circumference on the upper end of the lower valve disc. The switch hole is opened or closed simultaneously by the upper valve disc when the lower valve disc rotates. Several radially penetrating sliding holes are evenly distributed along the circumference on the outer side of the middle part of the upper joint corresponding to the position above the upper valve disc, and a support column is slidably installed in each sliding hole. A support assembly is provided between the upper end of the upper valve disc and the inner side of the upper part of the upper joint, which can make all the support columns extend outward or retract inward when moving up and down. The support assembly moves upward after the switch hole is closed by the upper valve disc, and moves downward after the switch hole is opened by the upper valve disc.

2. The drill string peristaltic tool according to claim 1, characterized in that The support assembly includes a support piston, a second elastic return member and a third elastic return member. A guide sleeve is fixed to the inner side of the upper part of the upper joint corresponding to the position above the support column. A sealing sleeve on the outer side of the guide sleeve is provided with a support piston whose lower end outer side is in sealing contact with the inner side of the upper joint. A second elastic return member is installed between the upper end of the support piston and the inner side of the upper joint, which can make the lower end of the support piston and the upper end of the upper valve disc abut against each other. The outer side of the middle part of the support piston has a conical guide surface which is smaller at the top and larger at the bottom. The inner end surface of each support column is an inclined surface matching the guide surface. A third elastic return member is installed between each support column and the sliding hole, which can make the inner end surface of the support column and the guide surface abut against each other.

3. The drill string peristaltic tool according to claim 2, characterized in that A first outer ring platform is fixed to the outer side of the upper end of the upper valve disc, and a second outer ring platform is fixed to the outer side of the lower end of the supporting piston, which is abutted against the upper end of the first outer ring platform. The outer side of the second outer ring platform is in sealing contact with the inner side of the upper joint, and a first step surface is provided on the inner side of the upper joint corresponding to the position between the second outer ring platform and the supporting column. The sliding hole is a step hole that is small on the outside and large on the inside. A third outer ring platform is fixed to the outer side of the inner end of the supporting column, and the third elastic reset member is installed on the outer side of the supporting column between the third outer ring platform and the large diameter section of the sliding hole.

4. The drill string peristaltic tool according to claim 2 or 3, characterized in that At least one breathing hole communicating with the inside and the outside is evenly distributed along the circumference on the outer side of the upper joint corresponding to the position between the lower side of the second elastic reset member and the upper side of the support column.

5. The drill string peristaltic tool according to claim 1, 2 or 3, characterized in that A torque sleeve with a regular polygonal cross-section is fixedly installed on the upper end of the lower joint, a first inner ring platform is fixed on the inner side of the lower end of the sleeve, the inner side of the first inner ring platform matches the outer side of the torque sleeve, the outer side of the lower part of the core shaft is sleeved on the outer side of the upper part of the torque sleeve, and the first elastic reset part is sleeved on the outer side of the torque sleeve between the lower end of the core shaft and the upper end of the first inner ring platform.

6. The drill string peristaltic tool according to claim 4, characterized in that A torque sleeve with a regular polygonal cross-section is fixedly installed on the upper end of the lower joint, a first inner ring platform is fixed on the inner side of the lower end of the sleeve, the inner side of the first inner ring platform matches the outer side of the torque sleeve, the outer side of the lower part of the core shaft is sleeved on the outer side of the upper part of the torque sleeve, and the first elastic reset part is sleeved on the outer side of the torque sleeve between the lower end of the core shaft and the upper end of the first inner ring platform.

7. The drill string peristaltic tool according to claim 5, characterized in that The outer side of the upper end of the torque sleeve is a conical surface that is smaller at the top and larger at the bottom. The lower end of the core shaft is provided with a limiting groove that matches the upper end of the torque sleeve. The outer side of the upper end of the torque sleeve is inserted into the limiting groove. A second step surface is provided on the outer side of the lower part of the core shaft corresponding to the position above the limiting groove. A third step surface is provided on the inner side of the upper part of the sleeve corresponding to the position below the second step surface. The inner diameter of the third step surface is smaller than the outer diameter of the second step surface.

8. The drill string peristaltic tool according to claim 6, characterized in that The outer side of the upper end of the torque sleeve is a conical surface that is smaller at the top and larger at the bottom. The lower end of the core shaft is provided with a limiting groove that matches the upper end of the torque sleeve. The outer side of the upper end of the torque sleeve is inserted into the limiting groove. A second step surface is provided on the outer side of the lower part of the core shaft corresponding to the position above the limiting groove. A third step surface is provided on the inner side of the upper part of the sleeve corresponding to the position below the second step surface. The inner diameter of the third step surface is smaller than the outer diameter of the second step surface.

9. The drill string peristaltic tool according to claim 1 or 2 or 3 or 6 or 7 or 8, characterized in that The lower part of the central axis of the guide hole is inclined outward relative to the upper part; or / and, a mounting groove opening upward is provided on the inner wall of the lower part of the rotating groove, and a bearing is installed between the inner side of the mounting groove and the outer side of the lower end of the rotating shaft.

10. The drill string peristaltic tool according to claim 4, characterized in that The lower part of the central axis of the guide hole is inclined outward relative to the upper part; or / and, a mounting groove opening upward is provided on the inner wall of the lower part of the rotating groove, and a bearing is installed between the inner side of the mounting groove and the outer side of the lower end of the rotating shaft.

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