CN113503128B - All-metal concentric forced flow distribution positive displacement downhole motor - Google Patents
All-metal concentric forced flow distribution positive displacement downhole motor Download PDFInfo
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- CN113503128B CN113503128B CN202110786166.0A CN202110786166A CN113503128B CN 113503128 B CN113503128 B CN 113503128B CN 202110786166 A CN202110786166 A CN 202110786166A CN 113503128 B CN113503128 B CN 113503128B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
- F03C2/00—Rotary-piston engines
- F03C2/08—Rotary-piston engines of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
Abstract
The application relates to the technical field of high-end underground equipment, in particular to an all-metal concentric forced flow distribution positive displacement underground motor which comprises an outer barrel and a primary stator-rotor unit arranged in the outer barrel; the primary stator and rotor unit comprises a flow distribution static shaft, a rotor and an outer stator which are sequentially sleeved from inside to outside, a fixed assembly is arranged between the flow distribution static shaft and the outer stator, and the rotor rotates inside the outer stator; a plurality of copper bars are movably embedded on the rotor, the positions of the rotor, which are positioned at the two ends of each copper bar, are respectively sleeved with a top sealing ring and a bottom sealing ring, and a high-pressure cavity and a low-pressure cavity which are arranged at intervals are formed among the rotor, the adjacent copper bars, the outer stator, the top sealing ring and the bottom sealing ring; a water inlet flow passage and a water outlet flow passage are arranged between the outer stator and the outer cylinder, and a water inlet for communicating the water inlet flow passage with the high-pressure cavity and a water outlet for communicating the water outlet flow passage with the low-pressure cavity are processed on the outer stator. The high-temperature-resistant forced flow distribution device has the advantages of high temperature resistance, large torque, concentricity in rotor movement and reliability in forced flow distribution.
Description
Technical Field
The application relates to the technical field of high-end underground equipment, in particular to an all-metal concentric forced flow distribution positive displacement underground motor driven by high-pressure drilling fluid.
Background
In recent years, with the rapid development of the drilling industry, the application of the high-temperature resistant downhole power drill is increasing in deep wells, ultra-deep wells and high-temperature geothermal wells.
Most of conventional power drilling tools are not high temperature resistant parts made of rubber, and the non-high temperature resistant parts are easily damaged by high temperature in the drilling process, so that the performance and the service life of the downhole power drilling tool are seriously affected, and therefore, the selection of a high temperature resistant all-metal power drilling tool is particularly important. At present, a mature all-metal underground power drilling tool is mainly a turbine drilling tool, but the turbine drilling tool has the defects of high output rotating speed and small torque in the actual use process, and cannot adapt to efficient rock breaking driving.
Disclosure of Invention
In order to increase output torque under the condition of high temperature resistance and ensure reliable flow distribution, the application provides an all-metal concentric forced flow distribution positive displacement downhole motor.
The application provides a concentric positive displacement downhole motor that flows that joins in marriage of all metal adopts following technical scheme:
an all-metal concentric forced flow distribution positive displacement downhole motor comprises an outer barrel and a primary stator-rotor unit arranged in the outer barrel;
the first-stage stator and rotor unit comprises a flow distribution static shaft, a rotor and an outer stator which are sequentially sleeved from inside to outside, a fixing component for connecting the flow distribution static shaft and the outer stator is arranged between the flow distribution static shaft and the outer stator, and the rotor is rotatably supported inside the outer stator through a bearing;
a plurality of copper bars which are simultaneously in rolling contact with the flow distribution static shaft and the outer stator are movably embedded on the rotor, a top sealing ring and a bottom sealing ring are respectively sleeved at the positions of the rotor, which are positioned at the two ends of the copper bars, and a high-pressure cavity and a low-pressure cavity which are arranged at intervals are formed among the rotor, the adjacent copper bars, the outer stator, the top sealing ring and the bottom sealing ring;
and a water inlet for communicating the water inlet channel with the high pressure cavity and a water outlet for communicating the water outlet channel with the low pressure cavity are processed on the outer stator.
By adopting the technical scheme, after flowing in from the liquid inlet end of the outer barrel, high-pressure drilling fluid enters the high-pressure cavity through the water inlet flow channel and the water inlet in sequence and pushes the copper bar, the copper bar pushes the rotor to rotate clockwise after being stressed, and after the rotor rotates to a certain angle, the high-pressure drilling fluid enters the low-pressure cavity and flows out from the water outlet and the water outlet flow channel in sequence; moreover, each part in the downhole motor is made of metal materials, so that the downhole motor has the characteristic of high temperature resistance; meanwhile, the pushing piece in the rotor is designed into a round copper bar, so that the possibility that the pushing piece is clamped in the hole of the rotor due to the couple generated when the high-pressure liquid pushes the copper bar can be greatly reduced, the copper bar is easier to throw out and enter, and the smooth and stable switching of the high-pressure cavity and the low-pressure cavity is further promoted.
Preferably, one end of the flow distribution static shaft close to the liquid inlet end is coaxially and fixedly connected with a positioning rod, and one end of the flow distribution static shaft far away from the liquid inlet end is coaxially and fixedly connected with a connecting rod;
the fixing component comprises an end cover and a top locking cap which are sleeved on the positioning rod in sequence from the liquid inlet end; the end cover comprises a cover plate and an insert ring formed on one side of the cover plate, the cover plate is abutted to the end face of the outer stator, a movable gap exists between the cover plate and the rotor, the outer wall face of the insert ring is tightly attached to the inner wall face of the outer stator, the outer wall face of the insert ring and the inner wall face of the outer stator are connected through a flat key, and the top locking cap is in threaded connection with the positioning rod and compresses the end cover.
Through adopting above-mentioned technical scheme, fixed subassembly's setting for join in marriage a class dead axle and hang on outer stator, reduce the rotor greatly and rotate the terminal surface frictional force of in-process, can also form seal structure at the feed liquor end simultaneously, prevent that high-pressure liquid from leaking.
Preferably, the outer wall surface of the flow distribution static shaft and the inner wall surface of the outer stator are both elliptical structures, and the long axis, and the short axis of the two elliptical structures are arranged concentrically.
Through adopting above-mentioned technical scheme, the setting of oval structure for can form high-pressure chamber and low-pressure chamber between the assembly section of rotor, adjacent bar copper, outer stator, top sealing ring and the bottom sealing ring, so that high-pressure liquid drive rotor transmission moment of torsion.
Preferably, the inside of the copper rod is of a hollow structure.
By adopting the technical scheme, the weight reduction device is mainly used for reducing weight, so that the copper rod is easier to throw out and enter.
Preferably, the outer wall of the outer stator is attached to the inner wall of the outer cylinder, a water inlet straight section and a water outlet straight section are processed on the outer wall of the outer stator and respectively extend from two ends of the outer stator along the axial direction of the outer stator, a water inlet flow channel is formed between the water inlet straight section and the inner wall of the outer cylinder, and a water outlet flow channel is formed between the water outlet straight section and the inner wall of the outer cylinder.
By adopting the technical scheme, the axial surface flow distribution of the outer stator is realized, so that the flow is increased.
Preferably, the water inlets and the water outlets are respectively provided with a plurality of water inlets, a plurality of water inlets are distributed on the water inlet straight tangent plane along the axial direction of the outer stator, and a plurality of water outlets are distributed on the water outlet straight tangent plane along the axial direction of the outer stator.
Through adopting above-mentioned technical scheme, the setting of a plurality of water inlets and delivery port for the flow of increase input and output makes the bigger moment of torsion of rotor transmission.
Preferably, a second-stage stator-rotor unit with the same structure as the first-stage stator-rotor unit is further arranged in the outer cylinder, and a connecting assembly for connecting the first-stage stator-rotor unit and the second-stage stator-rotor unit is arranged between the first-stage stator-rotor unit and the second-stage stator-rotor unit.
Through adopting above-mentioned technical scheme, decide rotor unit's each grade and can independently work, also can be through the multistage equipment work of coupling assembling.
Preferably, the connecting assembly comprises a stator connecting piece for connecting two adjacent distributing static shafts, a sleeve piece for connecting two adjacent rotors and a water passing connecting sleeve for connecting two adjacent outer stators;
the stator connecting piece comprises an upper barrel and a lower barrel which are integrally formed, one end of a connecting rod of the first-stage stator and rotor unit extends into the upper barrel and is fixed through a bolt, at least one positioning surface is processed on the outer wall of one end, close to the positioning rod of the second-stage stator and rotor unit, of the positioning rod of the second-stage stator and rotor unit, and a stop surface matched with the positioning surface is processed on the inner wall of the lower barrel;
the kit comprises a first sleeve and a second sleeve which are arranged in a split manner, and one end of a rotor of the primary stator-rotor unit extends into the first sleeve and is in threaded connection with the first sleeve; the second sleeve comprises an upper sleeve part and a lower sleeve part which are integrally formed, one end of a rotor of the secondary stator-rotor unit extends into the lower sleeve part and is in threaded connection with the lower sleeve part, a positioning rod of the secondary stator-rotor unit is rotatably connected with the upper sleeve part through a bearing, at least one cutting surface is processed on the outer wall of the upper sleeve part, and a transmission surface which is matched with the cutting surface to transmit torque is processed on the inner wall of the first sleeve;
the water passing connecting sleeve is sleeved outside the sleeve and connected with the two adjacent outer stators through a flat key, and a water passing groove for communicating the water outlet flow channel of the first-stage stator and rotor unit with the water inlet flow channel of the second-stage stator and rotor unit is processed on the outer wall of the water passing connecting sleeve.
By adopting the technical scheme, the multistage parallel connection of the stator and rotor units can be realized by the arrangement of the connecting assembly, and the stator and rotor units can be assembled as required in practical application; the positioning surface is matched with the stopping surface, so that the concentric and equidirectional arrangement between the adjacent distributing static shafts can be ensured; the cutting surface is matched with the transmission surface, so that the transmission torque between adjacent rotors can be ensured.
Preferably, the outer cylinder is provided with an upper joint and a lower joint which are arranged at two ends of the outer cylinder so as to tightly press and fix the primary stator-rotor unit and the secondary stator-rotor unit in the outer cylinder.
Through adopting above-mentioned technical scheme, mainly used fixes one-level stator-rotor unit and second grade stator-rotor unit.
Preferably, the upper joint comprises a first pressure ring and a first pressure head, the first pressure ring is positioned in the outer barrel and is simultaneously pressed on the outer stator of the fixing component and the outer stator of the first-stage stator-rotor unit, the first pressure head is in threaded connection with the outer barrel, one end of the first pressure head extends into the outer barrel and is abutted against the end part of the first pressure ring, and a liquid inlet communicated with a water inlet flow channel of the first-stage stator-rotor unit is processed on the side wall of the first pressure ring;
the lower joint is including being located the urceolus and pressing the second clamping ring that holds on the outer stator of second grade stator-rotor unit to and with urceolus threaded connection's second pressure head, the one end of second pressure head stretch into in the urceolus and with the tip butt of second clamping ring, process on the lateral wall of second clamping ring have the liquid outlet that is linked together with the play water flow way of second grade stator-rotor unit.
Through adopting above-mentioned technical scheme, the setting of top connection and bottom connection can be fixed in the urceolus with one-level stator rotor unit, second grade stator rotor unit, multistage stator rotor unit compresses tightly even, and the staff of being convenient for assembles as required.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the all-metal concentric forced flow distribution positive displacement downhole motor in the application has the advantages that water enters and is distributed according to the axial surface of the outer stator, and the two groups of water inlet flow channels and the water inlet are arranged, so that the flow of inlet and outlet water is greatly increased, and a rotor can transmit larger torque;
2. each stage of the stator and rotor unit in the all-metal concentric forced flow distribution positive displacement downhole motor can work independently, or can work by multi-stage assembly through the connecting component, and the stator and rotor unit can be directly inserted and connected in the assembly process, so that the all-metal concentric forced flow distribution positive displacement downhole motor is very convenient;
3. the pushing piece in the rotor is designed into a round hollow copper bar, so that the possibility that the pushing piece is clamped in the hole of the rotor due to the couple action generated when high-pressure liquid pushes the copper bar can be greatly reduced, the copper bar is easier to throw out and enter, and the smooth and stable switching of a high-pressure cavity and a low-pressure cavity is promoted;
4. the rotor is matched with the inner step surface of the outer stator through the fixed cover, the thrust ball bearing and the centering bearing so as to be suspended on the outer stator, the flow distribution static shaft is suspended on the outer stator through the fixed assembly, and the friction force between the rotor and other parts in the rotating process is greatly reduced by adopting two suspension modes.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an all-metal concentric forced flow downhole motor in an embodiment of the present application;
FIG. 2 is a schematic structural view showing the position of the connection assembly after the outer barrel is removed;
FIG. 3 is a sectional view showing an internal structure of a stator-rotor unit;
FIG. 4 is an exploded view showing the detailed structure of the fixing member and the fitting relationship between the fixing member and the outer cylinder;
FIG. 5 is a schematic view showing a specific structure of a rotor;
FIG. 6 is a cross-sectional view showing the fitting relationship among the fluid-distributing stator shaft, the rotor, the copper bar, the outer stator and the outer cylinder;
FIG. 7 is a schematic view showing a concrete structure of an outer stator;
FIG. 8 is a longitudinal sectional view showing the overall structure of an all-metal concentric forced flow distribution positive displacement downhole motor;
fig. 9 is a partially enlarged schematic view of a portion a in fig. 8;
FIG. 10 is a schematic view of a first sleeve;
FIG. 11 is a schematic view showing the structure of the second sleeve;
FIG. 12 is an exploded view showing the mating relationship between the water connecting sleeve and the adjacent outer stator;
FIG. 13 is an enlarged partial view of portion B of FIG. 8;
fig. 14 is a sectional view showing the upper joint in the mounted state;
fig. 15 is an exploded view illustrating the mating relationship between the lower connector and the outer stator.
Description of reference numerals: 1. an outer cylinder; 2. an upper joint; 21. a first pressure ring; 22. a first ram; 3. a lower joint; 31. a second pressure ring; 32. a second ram; 4. a connecting assembly; 41. a stator connection member; 411. an upper cylinder body; 412. a lower cylinder body; 42. a kit; 421. a first sleeve; 422. a second sleeve; 4221. an upper barrel part; 4222. a lower barrel part; 4223. an outer bearing surface; 4224. an inner support surface; 43. a water passing connecting sleeve; 431. passing through a water tank; 5. a flow distribution dead shaft; 51. positioning a rod; 52. a connecting rod; 6. a rotor; 61. assembling the sections; 611. a strip-shaped mounting opening; 62. a connecting section; 63. a copper bar; 64. a top seal ring; 65. a bottom seal ring; 7. an outer stator; 71. water inlet straight section; 72. discharging water and cutting the water into straight sections; 73. a water inlet; 74. a water outlet; 8. a fixing assembly; 81. a top locking cap; 82. a cover plate; 83. inserting a ring; 9. a flat bond; 10. a thrust ball bearing; 20. righting the bearing; 30. a fixed cover; 40. a gasket; 50. sealing the cavity; 60. a bolt; 70. an inner seal; 80. a top nut; 90. a bottom nut.
Detailed Description
The present application is described in further detail below with reference to figures 1-15.
The embodiment of the application discloses an all-metal concentric forced flow distribution positive displacement downhole motor. Referring to fig. 1 and 2, the all-metal concentric forced flow distribution positive displacement downhole motor includes an outer cylinder 1, an upper joint 2 and a lower joint 3, the upper joint 2 is fixed to one end of the outer cylinder 1, and the lower joint 3 is fixed to the other end of the outer cylinder 1. In the present embodiment, the end connected with the upper joint 2 is defined as the upper end or liquid inlet end of the outer cylinder 1, and the end connected with the lower joint 3 is defined as the lower end or liquid outlet end of the outer cylinder 1. A first-stage stator-rotor unit, a connecting assembly 4 and a second-stage stator-rotor unit are sequentially arranged in the outer barrel 1 from top to bottom, and the connecting assembly 4 is mainly used for connecting the first-stage stator-rotor unit and the second-stage stator-rotor unit together; the upper connector 2 is used for being matched with the lower connector 3 to tightly press and fix the primary stator-rotor unit, the connecting assembly 4 and the secondary stator-rotor unit in the outer barrel 1, and is used for being connected with a high-pressure water pipe; according to the needs, a plurality of stages of stator and rotor units can be arranged.
Urceolus 1, top connection 2, lower clutch 3, one-level stator-rotor unit, coupling assembling 4 and second grade stator-rotor unit form by metal material processing for the motor possesses high temperature resistance's advantage, is favorable to the probing in the pit more.
Referring to fig. 3, the first-stage stator-rotor unit and the second-stage stator-rotor unit have the same structure, and both of them include a flow distribution static shaft 5, a rotor 6 and an outer stator 7 which are sequentially sleeved from inside to outside, a positioning rod 51 extending from the rotor 6 to the outside is coaxially and fixedly connected to one end of the flow distribution static shaft 5, a connecting rod 52 is coaxially and fixedly connected to the other end of the flow distribution static shaft 5, and the rotor 6 rotates between the flow distribution static shaft 5 and the outer stator 7.
Referring to fig. 3 and 4, a fixing assembly 8 for connecting the flow distribution static shaft 5 and the outer stator 7 is arranged between the flow distribution static shaft and the outer stator, and the fixing assembly 8 comprises an end cover and a top locking cap 81 which are sequentially sleeved on the positioning rod 51 from the liquid inlet end to the liquid outlet end; the end cover comprises a cover plate 82 and an insert ring 83 formed on one side of the cover plate 82, during assembly, the cover plate 82 abuts against the end face of the outer stator 7, the outer wall face of the insert ring 83 is tightly attached to the inner wall face of the outer stator 7 and connected with the inner wall face of the outer stator 7 through a flat key 9, a top locking cap 81 is in threaded connection with the positioning rod 51 and tightly presses the end cover, and a sealing structure is formed between the insert ring 83 and the outer stator 7. In order to avoid that the staff rotates when top locking cap 81 the quiet axle 5 that flows along with it rotates, process outer hexagonal structure on the outer wall of the locating lever 51 of one-level stator-rotor unit, process simultaneously on apron 82 with outer hexagonal structure matched with interior hexagonal hole, carry out the screens through outer hexagonal structure and interior hexagonal hole to restriction quiet axle 5 circumferential direction that flows.
Referring to fig. 3 and 5, the rotor 6 is cylindrical, the interior of the rotor 6 is hollow, two ends of the rotor are open, the rotor 6 comprises an assembling section 61 and connecting sections 62 integrally formed at two ends of the assembling section 61, the two connecting sections 62 of the rotor 6 are rotatably supported inside the outer stator 7 through the thrust ball bearing 10, and in order to ensure the stability of the rotor 6 in the rotating process, a centering bearing 20 is further arranged between the connecting sections 62 and the outer barrel 1 and close to the thrust ball bearing 10.
An inner step surface is processed on the inner wall of the outer stator 7, a cylindrical fixing cover 30 is arranged on the connecting section 62 close to the liquid inlet end, a hole for the positioning rod 51 to pass through is processed on the fixing cover 30, and a movable gap is formed between the upper surface of the fixing cover 30 and the lower surface of the cover plate 82 and is mainly used for reducing the end surface friction force in the rotation process of the rotor 6; during assembly, the gasket 40 is sleeved outside the connecting section 62, then the fixing cover 30 is in threaded connection with the connecting section 62, in the process, one end of the fixing cover 30 extends into a gap between the rotor 6 and the outer stator 7, and the gasket 40, the thrust ball bearing 10 and the centering bearing 20 are sequentially pressed on an inner step surface of the outer stator 7, so that the rotor 6 is suspended on the outer stator 7, and the suspension mode is adopted and is mainly used for reducing friction force generated between the rotor 6 and other components in the rotating process.
Referring to fig. 5 and 6, a plurality of strip-shaped mounting ports 611 which are communicated with each other inside and outside and extend axially along the assembly section 61 are formed in the assembly section 61, the strip-shaped mounting ports 611 are circumferentially and equidistantly distributed, a copper rod 63 which is in rolling contact with the inner walls of the current-distributing dead shaft 5, the outer stator 7 and the strip-shaped mounting ports 611 simultaneously is movably embedded in each strip-shaped mounting port 611, the inside of the copper rod 63 is of a hollow structure, and the copper rod 63 is equal in height to the strip-shaped mounting ports 611.
Referring to fig. 3 and 6, the rotor 6 is sleeved with a top sealing ring 64 and a bottom sealing ring 65 at the two ends of the copper bar 63, and the top sealing ring 64 and the bottom sealing ring 65 are fixed at the protruding end surface of the copper bar 63 under the pressing of the centering bearing 20 or the wear-resistant sleeve; the outer wall surface of the flow distribution static shaft 5 and the inner wall surface of the outer stator 7 are both elliptical structures, and the long axes, the short axes and the short axes of the two elliptical structures are concentrically arranged, so that a plurality of sealing cavities 50 are formed among the assembly section 61 of the rotor 6, the adjacent copper bars 63, the outer stator 7, the top sealing ring 64 and the bottom sealing ring 65, wherein the number of the sealing cavities 50 is six in the embodiment, but only four sealing cavities are used for driving the rotor 6 to rotate.
Referring to fig. 6 and 7, the outer stator 7 has a hollow cylindrical structure with both ends open, and when it is assembled in the outer tube 1, the outer wall of the outer stator 7 is fitted to the inner wall of the outer tube 1. Two water inlet straight cutting surfaces 71 and two water outlet straight cutting surfaces 72 are processed on the outer wall of the outer stator 7, the water inlet straight cutting surfaces 71 and the water outlet straight cutting surfaces 72 respectively extend from two ends of the outer stator 7 along the axial direction of the outer stator 7, the lengths of the water inlet straight cutting surfaces 71 and the water outlet straight cutting surfaces 72 are smaller than that of the outer stator 7, a water inlet flow passage is formed between the water inlet straight cutting surfaces 71 and the inner wall of the outer barrel 1, and a water outlet flow passage is formed between the water outlet straight cutting surfaces 72 and the inner wall of the outer barrel 1. Each water inlet straight section 71 is provided with a group of water inlets 73 which are equidistantly arranged along the axial direction of the outer stator 7, and the two groups of water inlets 73 are distributed in an angle of 180 degrees; each water outlet straight section 72 is provided with a group of water outlets 74 which are equidistantly arranged along the axial direction of the outer stator 7, and the two groups of water outlets 74 and the two groups of water inlets 73 are arranged at intervals; the sealed chamber 50 in communication with the water inlet 73 is a high pressure chamber and the sealed chamber 50 in communication with the water outlet 74 is a low pressure chamber.
High-pressure drilling fluid flows in from the feed liquor end of urceolus 1 after, it is in proper order through water inlet channel, water inlet 73 gets into the high-pressure intracavity and promotes bar copper 63, promote rotor 6 clockwise rotation after the bar copper 63 atress, rotor 6 is rotatory to certain angle back high-pressure drilling fluid gets into the low pressure intracavity and flows by delivery port 74 and play water channel in proper order, in this process, rely on outer stator 7's axial plane water inlet flow distribution, two sets of water inlet channel and water inlet 73's setting, greatly increased the inflow flow, the rotational speed of rotor 6 has been reduced, make rotor 6 can transmit bigger moment of torsion.
Referring to fig. 8 and 9, the connecting assembly 4 includes a stator connecting member 41 for connecting two adjacent static shafts 5, a sleeve member 42 for connecting two adjacent rotors 6, and a water passing connecting sleeve 43 for connecting two adjacent outer stators 7.
Referring to fig. 9, the stator connector 41 includes an upper cylinder 411 and a lower cylinder 412 that are integrally formed, one end of the connecting rod 52 of the first-stage stator-rotor unit extends into the upper cylinder 411 and is fixed by the bolt 60, the connecting rod 52 of the first-stage stator-rotor unit is sleeved with the inner sealing element 70, the inner sealing element 70 is pressed on the distributing static shaft 5 by the upper cylinder 411, and the inner sealing element is used for sealing a cavity among the distributing static shaft 5, the rotor 6 and the copper bar 63, so as to reduce the possibility of leakage of high-pressure liquid from the cavity, and ensure the normal operation of the rotor 6. An outer hexagonal structure is processed on the outer wall of one end, close to the positioning rod 51 of the secondary stator-rotor unit, an inner hexagonal structure is processed on the inner wall of the lower cylinder 412, and the outer hexagonal structure is in plug-in fit with the inner hexagonal structure.
Referring to fig. 9 and 10, the kit 42 includes a first sleeve 421 and a second sleeve 422 which are separately arranged, and the connection section 62 of the primary stator-rotor unit near the liquid outlet end extends into the first sleeve 421 and is in threaded connection with the first sleeve 421; with reference to fig. 9 and 11, the second sleeve 422 comprises an upper 4221 and a lower 4222 integrally formed, the upper 4221 having a smaller diameter than the lower 4222 and both forming an outer 4223 bearing surface on the outside and an inner 4224 bearing surface on the inside; the connecting section 62 of the secondary stator-rotor unit, which is far away from the liquid outlet end, extends into the lower cylinder 4222 and is in threaded connection with the lower cylinder 4222; a positioning rod 51 of the secondary stator-rotor unit is rotatably connected with an upper barrel 4221 through a thrust ball bearing 10, a top nut 80 is in threaded connection with the outer side wall of the positioning rod 51 below the outer hexagonal structure of the positioning rod, the thrust ball bearing 10 is pressed on an inner supporting surface 4224 through a gasket 40 by the top nut 80, and the end part of the lower barrel 412 is in butt fit with the end part of the top nut 80; referring to fig. 10 and 11, an outer hexagonal structure is formed on an outer wall of the upper cylinder 4221, an inner hexagonal structure is formed on an inner wall of the first sleeve 421, and when the two-stage stator and rotor unit is assembled, the first sleeve 421 is sleeved outside the upper cylinder 4221 and abuts against the outer support surface 4223, so that the outer hexagonal structure and the inner hexagonal structure are matched, and torque transmission between the two-stage stator and rotor unit is realized.
Referring to fig. 9 and 12, the water passing connecting sleeve 43 is sleeved outside the sleeve 42, two ends of the water passing connecting sleeve 43 are respectively abutted to end faces of two adjacent outer stators 7 and are connected through a flat key 9, and a water passing groove 431 is processed on the outer wall of the water passing connecting sleeve 43 and is used for communicating a water outlet flow channel of the first-stage stator and rotor unit with a water inlet flow channel of the second-stage stator and rotor unit, so that high-pressure drilling fluid enters the second-stage stator and rotor unit.
Referring to fig. 13, a bottom nut 90, a centering bearing 20 and an inner sealing element 70 are sequentially installed on a connecting rod 52 of the secondary stator-rotor unit from a liquid outlet end to a liquid inlet end, the bottom nut 90 is in threaded connection with the connecting rod 52 and presses the inner sealing element 70 on the distributing static shaft 5 through the centering bearing 20, and the bottom nut 90 is used for sealing a cavity among the distributing static shaft 5, the rotor 6 and the copper bar 63, so that the possibility of leakage of high-pressure liquid from the cavity is reduced, and the normal operation of the rotor 6 is ensured.
Referring to fig. 14 and 15, the upper joint 2 includes a first pressing ring 21 located in the outer cylinder 1 and pressed on the cover plate 82 and the outer stator 7 of the primary stator-rotor unit at the same time, and a first pressing head 22 in threaded connection with the outer cylinder 1, one end of the first pressing head 22 extends into the outer cylinder 1 and abuts against the end of the first pressing ring 21, and a liquid inlet communicated with the water inlet channel of the primary stator-rotor unit is processed on the side wall of the first pressing ring 21; the lower joint 3 comprises a second pressing ring 31 which is positioned in the outer barrel 1 and is pressed on the outer stator 7 of the second-stage stator-rotor unit, and a second pressing head 32 which is in threaded connection with the outer barrel 1, one end of the second pressing head 32 extends into the outer barrel 1 and is abutted to the end part of the second pressing ring 31, and a liquid outlet which is communicated with a water outlet flow channel of the second-stage stator-rotor unit is processed on the side wall of the second pressing ring 31.
The implementation principle of the embodiment of the application is as follows: during operation, pour into high-pressure drilling fluid into from the inlet end of urceolus 1, the high-pressure liquid of injection passes through the inlet of one-level stator-rotor unit in proper order, the runner of intaking, water inlet 73 gets into the high-pressure intracavity and promotes bar copper 63, promote rotor 6 clockwise rotation after the bar copper 63 atress, rotor 6 rotates to certain angle after, high-pressure drilling fluid gets into the low pressure intracavity and gets into out the runner by delivery port 74 in, at this moment, the high-pressure drilling fluid that flows from one-level stator-rotor unit gets into in the second grade stator-rotor unit through crossing water groove 431 on water adapter sleeve 43, thereby realize multistage parallelly connected, output bigger moment of torsion.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. An all-metal concentric forced flow distribution positive displacement downhole motor is characterized by comprising an outer barrel (1) and a primary stator-rotor unit arranged in the outer barrel (1);
the primary stator and rotor unit comprises a flow distribution static shaft (5), a rotor (6) and an outer stator (7) which are sequentially sleeved from inside to outside, a fixing component (8) for connecting the flow distribution static shaft (5) and the outer stator (7) is arranged between the flow distribution static shaft and the outer stator, and the rotor (6) is rotatably supported inside the outer stator (7) through a bearing;
a plurality of copper bars (63) which are simultaneously in rolling contact with the flow distribution static shaft (5) and the outer stator (7) are movably embedded on the rotor (6), top sealing rings (64) and bottom sealing rings (65) are respectively sleeved at positions of the rotor (6) at two ends of each copper bar (63), and high-pressure cavities and low-pressure cavities which are arranged at intervals are formed among the rotor (6), the adjacent copper bars (63), the outer stator (7), the top sealing rings (64) and the bottom sealing rings (65);
a water inlet channel which is in one-to-one correspondence with the high pressure cavity and a water outlet channel which is in one-to-one correspondence with the low pressure cavity are arranged between the outer stator (7) and the outer barrel (1), and a water inlet (73) which communicates the water inlet channel with the high pressure cavity and a water outlet (74) which communicates the water outlet channel with the low pressure cavity are processed on the outer stator (7);
the outer wall of outer stator (7) and the inner wall of urceolus (1) laminate mutually, and processing has into water straight tangent plane (71) and goes out water straight tangent plane (72) on the outer wall of outer stator (7), and the axial extension of outer stator (7) is followed by the both ends of outer stator (7) respectively to water straight tangent plane (71) and play water straight tangent plane (72), forms into the water runner between the inner wall of water straight tangent plane (71) and urceolus (1), goes out to form out the water runner between the inner wall of water straight tangent plane (72) and urceolus (1).
2. An all metal concentric forced flow downhole motor as defined in claim 1, wherein: a positioning rod (51) is coaxially and fixedly connected to one end, close to the liquid inlet end, of the flow distribution static shaft (5), and a connecting rod (52) is coaxially and fixedly connected to one end, far away from the liquid inlet end, of the flow distribution static shaft (5);
the fixing component (8) comprises an end cover and a top locking cap (81), wherein the liquid inlet end of the end cover is sleeved on the positioning rod (51) in sequence; the end cover comprises a cover plate (82) and an insert ring (83) formed on one side of the cover plate (82), the cover plate (82) is abutted to the end face of the outer stator (7), a movable gap exists between the cover plate (82) and the rotor (6), the outer wall face of the insert ring (83) is tightly attached to the inner wall face of the outer stator (7) and is connected with the inner wall face of the outer stator (7) through a flat key (9), and a top locking cap (81) is in threaded connection with the positioning rod (51) and compresses the end cover.
3. An all metal concentric forced flow downhole motor as defined in claim 1, wherein: the outer wall surface of the flow distribution static shaft (5) and the inner wall surface of the outer stator (7) are both elliptical structures, and the long axis, and the short axis of the two elliptical structures are arranged concentrically.
4. An all metal concentric forced flow downhole motor as defined in claim 1, wherein: the interior of the copper rod (63) is of a hollow structure.
5. An all metal concentric forced flow downhole motor as defined in claim 1, wherein: the water inlet (73) and the water outlet (74) are both provided with a plurality of water inlets (73), the plurality of water inlets (73) are distributed on the water inlet straight section (71) along the axial direction of the outer stator (7), and the plurality of water outlets (74) are distributed on the water outlet straight section (72) along the axial direction of the outer stator (7).
6. An all metal concentric forced flow downhole motor according to claim 2, wherein: still be provided with the second grade stator-rotor unit the same with one-level stator-rotor unit structure in urceolus (1), be equipped with between one-level stator-rotor unit and the second grade stator-rotor unit and be connected coupling assembling (4) between them.
7. An all metal concentric forced flow downhole motor according to claim 6, wherein: the connecting assembly (4) comprises a stator connecting piece (41) used for connecting two adjacent distributing static shafts (5), a sleeve piece (42) used for connecting two adjacent rotors (6) and a water passing connecting sleeve (43) used for connecting two adjacent outer stators (7);
the stator connecting piece (41) comprises an upper barrel (411) and a lower barrel (412) which are integrally formed, one end of a connecting rod (52) of the first-stage stator-rotor unit extends into the upper barrel (411) and is fixed through a bolt (60), at least one positioning surface is processed on the outer wall, close to one end, of a positioning rod (51) of the second-stage stator-rotor unit, and a stop surface matched with the positioning surface is processed on the inner wall of the lower barrel (412);
the kit (42) comprises a first sleeve (421) and a second sleeve (422) which are arranged in a split mode, one end of a rotor (6) of the primary stator-rotor unit extends into the first sleeve (421) and is in threaded connection with the first sleeve (421); the second sleeve (422) comprises an upper cylinder piece (4221) and a lower cylinder piece (4222) which are integrally formed, one end of a rotor (6) of the secondary stator-rotor unit extends into the lower cylinder piece (4222) and is in threaded connection with the lower cylinder piece (4222), a positioning rod (51) of the secondary stator-rotor unit is rotatably connected with the upper cylinder piece (4221) through a bearing, at least one cutting surface is machined on the outer wall of the upper cylinder piece (4221), and a transmission surface which is matched with the cutting surface to transmit torque is machined on the inner wall of the first sleeve (421);
the water passing connecting sleeve (43) is sleeved outside the sleeve (42) and is connected with the two adjacent outer stators (7) through a flat key (9), and a water passing groove (431) used for communicating a water outlet flow channel of the first-stage stator-rotor unit with a water inlet flow channel of the second-stage stator-rotor unit is processed on the outer wall of the water passing connecting sleeve (43).
8. An all metal concentric forced flow downhole motor according to claim 6, wherein: the device also comprises an upper joint (2) and a lower joint (3) which are arranged at the two ends of the outer cylinder (1) and used for tightly pressing and fixing the first-stage stator-rotor unit and the second-stage stator-rotor unit in the outer cylinder (1).
9. An all metal concentric forced flow downhole motor according to claim 8, wherein: the upper connector (2) comprises a first pressing ring (21) which is positioned in the outer barrel (1) and is simultaneously pressed on the outer stator (7) of the fixed component (8) and the primary stator-rotor unit, and a first pressing head (22) in threaded connection with the outer barrel (1), one end of the first pressing head (22) extends into the outer barrel (1) and is abutted against the end part of the first pressing ring (21), and a liquid inlet communicated with a water inlet channel of the primary stator-rotor unit is processed on the side wall of the first pressing ring (21);
lower clutch (3) including being located urceolus (1) and press second clamping ring (31) on outer stator (7) of holding at second grade stator rotor unit to and with urceolus (1) threaded connection's second pressure head (32), the one end of second pressure head (32) stretch into urceolus (1) in and with the tip butt of second clamping ring (31), process on the lateral wall of second clamping ring (31) have the liquid outlet that is linked together with the play water runner of second grade stator rotor unit.
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| CN202110786166.0A CN113503128B (en) | 2021-07-12 | 2021-07-12 | All-metal concentric forced flow distribution positive displacement downhole motor |
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| CN202110786166.0A CN113503128B (en) | 2021-07-12 | 2021-07-12 | All-metal concentric forced flow distribution positive displacement downhole motor |
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| CN113503128B true CN113503128B (en) | 2022-01-04 |
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| CN114961551A (en) * | 2022-05-09 | 2022-08-30 | 中国地质大学（北京） | All-metal axial double-plunger rotary impact type downhole positive displacement motor |
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|---|---|---|---|---|
| GB1118960A (en) * | 1965-06-09 | 1968-07-03 | Eickmann Karl | Improvements in radial cylinder reciprocating piston pumps, motors, compressors and the like |
| US3540816A (en) * | 1967-12-05 | 1970-11-17 | Rafael Gil Alcolea | Coaxial multi-stage rotory compressor |
| US4692105A (en) * | 1984-05-21 | 1987-09-08 | Andre Leroy | Roller displacement motor |
| JP3200489U (en) * | 2015-08-03 | 2015-10-22 | 明寛 猪狩 | Rotary engine, magnetic compressor device and magnetic motor auxiliary machine |
| CN109505728A (en) * | 2018-12-28 | 2019-03-22 | 中国地质大学（北京） | Dynamic pushing type rotary motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7172039B2 (en) * | 2003-10-29 | 2007-02-06 | Weatherford/Lamb, Inc. | Down-hole vane motor |
-
2021
- 2021-07-12 CN CN202110786166.0A patent/CN113503128B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1118960A (en) * | 1965-06-09 | 1968-07-03 | Eickmann Karl | Improvements in radial cylinder reciprocating piston pumps, motors, compressors and the like |
| US3540816A (en) * | 1967-12-05 | 1970-11-17 | Rafael Gil Alcolea | Coaxial multi-stage rotory compressor |
| US4692105A (en) * | 1984-05-21 | 1987-09-08 | Andre Leroy | Roller displacement motor |
| JP3200489U (en) * | 2015-08-03 | 2015-10-22 | 明寛 猪狩 | Rotary engine, magnetic compressor device and magnetic motor auxiliary machine |
| CN109505728A (en) * | 2018-12-28 | 2019-03-22 | 中国地质大学（北京） | Dynamic pushing type rotary motor |
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