CN112443448A - Internal gear type hydraulic motor mechanism for downhole drilling tool - Google Patents
Internal gear type hydraulic motor mechanism for downhole drilling tool Download PDFInfo
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- CN112443448A CN112443448A CN201910812336.0A CN201910812336A CN112443448A CN 112443448 A CN112443448 A CN 112443448A CN 201910812336 A CN201910812336 A CN 201910812336A CN 112443448 A CN112443448 A CN 112443448A
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- 238000005553 drilling Methods 0.000 title claims abstract description 83
- 230000007246 mechanism Effects 0.000 title claims abstract description 42
- 238000005192 partition Methods 0.000 claims abstract description 61
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- 238000000429 assembly Methods 0.000 claims abstract description 25
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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
- F03C2/30—Rotary-piston engines having the characteristics covered by two or more of groups F03C2/02, F03C2/08, F03C2/22, F03C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F03C2/304—Rotary-piston engines having the characteristics covered by two or more of groups F03C2/02, F03C2/08, F03C2/22, F03C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having both the movements defined in sub-group F03C2/08 or F03C2/22 and relative reciprocation between members
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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Abstract
The invention provides an internal gear type hydraulic motor mechanism for an underground drilling tool. The motor mechanism comprises a first end straight-through joint, a second end straight-through joint, a fastening piece, an upper motor cover, a lower motor cover, a plurality of gear assemblies and more than one middle partition plate, wherein the upper motor cover and the lower motor cover are coaxially arranged; any middle partition plate is arranged between two adjacent gear assemblies; the gear assembly and the middle clapboard are assembled by the upper cover and the lower cover of the motor through fasteners, and a drilling medium channel is formed in the central axis area; the first and second end straight-through joints are arranged on the motor upper cover and communicate the hydraulic cavities containing the pinions to respectively form a liquid inlet passage and a liquid outlet passage. The invention overcomes the problems of large screw rotation speed fluctuation, poor reliability and short service life of the gas screw caused by poor gas lubricity and compressibility, and has better economic benefit.
Description
Technical Field
The invention belongs to the technical field of underground power equipment for oil-gas drilling or drilling engineering, and particularly relates to an internal gear type hydraulic motor mechanism which can be used in an underground drilling tool.
Background
At present, the exploration proportion of low-yield, low-pressure and low-permeability oil and gas reservoirs is enlarged year by year, and highly deviated wells and horizontal wells become the mainstream of exploration and development. The gas drilling technology has the advantages of high mechanical drilling speed, effective treatment of well leakage, protection of oil and gas reservoirs, great increase of single well yield and the like. Therefore, the gas drilling technology is applied to the exploration and development of unconventional oil and gas resources with low yield, low pressure, low permeability and the like, and has great significance and wide market prospect. Practices show that the gas drilling of the directional well and the horizontal well can greatly improve the mechanical drilling speed, effectively discover and protect oil and gas reservoirs, improve the yield of a single well, reduce the land acquisition and environmental pollution, and has remarkable economic benefit. The technology realizes the structural benefit development of a large tower field, finishes 40 nitrogen drilling highly-deviated wells, and obtains 3.25 multiplied by 10 gas from a single well on average4m3And/d is more than 6 times of the conventional drilling yield. However, due to the lack of reliable, efficient gas drilling downhole power tools, gas drilling technology is currently limitedThe method is used for drilling a highly-deviated well section and cannot be used for a horizontal well section, and the deflecting of the directional well section is completed by a mud drilling technology, so that the popularization and the application of the gas drilling technology are limited to a great extent. And the development of the downhole power tool under the gas phase condition can provide important technical support for gas drilling of directional wells and horizontal wells.
At present, the following gas drilling technology downhole power tools are mainly available at home and abroad:
(1) air screw
The downhole power tools for gas drilling at home and abroad are mainly gas-driven screws, and the air screws are developed on the basis of mud screws in the last 30 years without revolutionary changes. The air screw rod is owned by Beijing petroleum machinery factory, Tianjin Lilin and the like in China, is basically used for foam drilling, and is not mature in application under the condition of dry gas. Due to the defects of poor lubricating property and compressibility of gas, the service life of a pneumatic screw is short (generally within 30-50 hours, the conventional slurry screw exceeds 120 hours), the fluctuation of the rotating speed is large, and the problems of abnormal abrasion of blade teeth of a drill bit, abnormal change of torque of a drill string, sudden rise of gas injection pressure and the like are caused; meanwhile, the air screw is easy to fly, so that the stator rubber is prematurely failed, and even the air screw is drawn out, and the reliability of the air screw is poor.
(2) Self-rotating air hammer
In China, units such as Chuanqing drilling, the Central and petrochemical southwest office, the southwest oil university and the like are developed by using the autorotation air hammer. Among them, an autorotation air hammer (No. CN201598972U) describes a gas drilling downhole power tool in which a piston of the air hammer is driven by gas to reciprocate, and the linear motion of the piston is converted into the rotary motion of a drill bit by a mechanical screw type clutch mechanism. The tool is driven directly by the compression energy of the gas. Since gas is a compressible fluid with a high compression ratio, the process of directly driving the piston with gas and converting the impact into rotation has the obvious "soft" characteristic.
(3) Gas-liquid combined driving downhole power tool
Gas drilling downhole power tool (No. CN104213829B) and gas drilling screw tool (No. CN105484665B) both describe a gas drilling downhole power tool in which a hydraulic piston is driven by gas to reciprocate, thereby pushing high-pressure liquid into a sealed screw mechanism and rotating a screw through sealed circulation of the liquid. However, due to the compressibility of the gas, the working characteristics of the whole mechanism still have obvious 'soft' characteristics, and the response speed is very slow.
In summary, the application of the air screw at home and abroad under the condition of dry gas is not mature, and the problems mainly exist as follows:
(1) the service life is short, generally within 30-50 hours, while the service life of the conventional screw exceeds 120 hours.
(2) The motor is easy to run away, so that the temperature of a friction pair of the motor is increased violently, the stator rubber fails prematurely, even the stator rubber is buckled upside down and the cylinder is pulled out, and underground accidents are easily caused.
(3) Unstable, the rotation speed fluctuates greatly with the load, resulting in easy abrasion of the drill bit.
(4) Poor rigidity, easy poor rotation caused by increased load, and capability of overcoming the instant steep rise of the rotating speed of the load.
(5) Less lubrication, and the meshing transmission kinematic pair can not obtain good lubrication and heat dissipation effects, thereby seriously affecting the service life of the kinematic pair.
(6) The leakage is large, and the leakage loss of compressed air is large due to low medium viscosity and poor air screw tightness.
(7) The heat conduction is poor, the compression and expansion processes have large heat loss, and the local working environment temperature of the screw motor is very high, so that non-metal parts are easy to age and metal parts are easy to corrode.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, it is an object of the present invention to provide a downhole power tool that can be used to drill horizontal or directional wells (especially gas drilling horizontal or directional wells) instead of air screws.
In order to achieve the above object, the present invention provides an internal gear type hydraulic motor mechanism for a downhole drilling tool, the hydraulic motor mechanism comprises a first end straight-through joint, a second end straight-through joint, a fastener, a motor upper cover, more than two gear components, more than one middle partition plate and a motor lower cover which are coaxially arranged, wherein any one gear assembly of the more than two gear assemblies comprises a supporting block, a pinion shaft and an inner gear ring, wherein the supporting block is provided with a concave part and a first middle hole arranged along the direction of the shaft, the pinion is fixedly arranged on the pinion shaft and arranged in the concave part of the supporting block, the inner gear ring is provided with an inner circumferential wall provided with a tooth socket and an outer wall provided with a key groove, the key groove can transmit the rotating torque of the inner gear ring to a drill bit for drilling, and the tooth groove is meshed with the pinion; the number of the more than one middle partition plates is one less than that of the more than two gear assemblies, any middle partition plate in the more than one middle partition plates is arranged between two adjacent gear assemblies in the more than two gear assemblies, and any middle partition plate is provided with a second middle hole arranged along the direction of the shaft; the motor upper cover is provided with a third middle hole arranged along the direction of the shaft, the motor lower cover is provided with a fourth middle hole arranged along the direction of the shaft, the motor upper cover and the motor lower cover are connected with the fastening piece to tightly assemble the more than two gear assemblies and the more than one middle partition plate, and the first middle hole, the second middle hole, the third middle hole and the fourth middle hole are communicated to form a channel for a drilling medium to flow to a well bottom, two ends of a pinion shaft of the gear assembly close to the motor upper cover in any gear assembly are respectively fixed on the motor upper cover and the middle partition plate through bearings, an upper hydraulic cavity is formed through the motor upper cover, the inner gear ring, the supporting block, the pinion and the middle partition plate, two ends of the pinion shaft of the gear assembly close to the motor lower cover in any gear assembly are respectively fixed on the motor lower cover and the middle partition plate through bearings, a lower hydraulic cavity is formed by a motor lower cover, an inner gear ring, a supporting block, a pinion and a middle partition plate, two ends of a pinion shaft of a gear assembly positioned between two adjacent middle partition plates in any gear assembly are respectively fixed on the two adjacent middle partition plates through bearings, and a middle hydraulic cavity is formed by the two adjacent middle partition plates, the inner gear ring, the supporting block and the pinion; the first end straight joint is arranged on the upper cover of the motor and is used for communicating the upper hydraulic cavity, the middle hydraulic cavity and the lower hydraulic cavity through first through holes respectively penetrating through the upper cover of the motor and any one of the middle partition plates so as to form a liquid inlet passage; the second end straight joint is arranged on the upper motor cover and is communicated with the upper hydraulic cavity, the middle hydraulic cavity and the lower hydraulic cavity through second through holes respectively penetrating through the upper motor cover and any middle partition plate so as to form a liquid outlet passage.
In an exemplary embodiment of the invention, the number of the pinion, the pinion shaft and the recess of the bearing block in any one of the gear assemblies may be two or more than three, the number of the first end through joints is two or more than three, respectively, and the number of the second end through joints is two or more than three, respectively.
In an exemplary embodiment of the present invention, the internal gear type hydraulic motor mechanism may further include a motor cylinder sleeve which is fitted around the outside of the motor upper cover, the two or more gear assemblies, the one or more middle partition plates, and the motor lower cover, and the motor cylinder sleeve is connected with the key groove of the ring gear of any one of the gear assemblies by a connecting key.
In an exemplary embodiment of the present invention, the fastener may be a draw rod stud assembly that achieves the tight assembly by penetrating the motor upper cover, the two or more gear assemblies, the one or more midplanes, and the motor lower cover. For example, the draw rod stud assembly may also be connected with a drive shaft located upstream and/or a lower spindle located downstream.
In an exemplary embodiment of the invention, the hydraulic motor mechanism may further include high-pressure hoses connecting the first and second end through-connections to the hydraulic power source, respectively.
Another aspect of the present invention provides an internal gear type hydraulic motor mechanism for a downhole drilling tool, the hydraulic motor mechanism including a first end through joint, a second end through joint, a fastener, and a motor upper cover, a gear assembly, and a motor lower cover coaxially disposed in this order, wherein the gear assembly includes a support block, a pinion shaft, and an inner gear ring, wherein the support block has a recess and a first through hole provided in a direction of the shaft, the pinion is fixedly disposed on the pinion shaft and disposed in the recess of the support block, the inner gear ring has an inner circumferential wall provided with a spline capable of transmitting a rotational torque of the inner gear ring to a drilling bit, and an outer wall provided with a spline engaged with the pinion; the motor upper cover is provided with a second middle through hole arranged along the direction of the shaft, the motor lower cover is provided with a third middle through hole arranged along the direction of the shaft, the motor upper cover and the motor lower cover are connected with the fastening piece to tightly assemble the gear assembly, the first middle through hole, the second middle through hole and the third middle through hole are communicated to form a channel for a drilling medium to flow to the well bottom, two ends of the pinion shaft are respectively fixed on the motor upper cover and the motor lower cover through bearings, and a hydraulic cavity is formed by the motor upper cover, the inner gear ring, the concave part of the supporting block, the pinion and the motor lower cover; the first end straight joint is arranged on the upper motor cover and is communicated with the hydraulic cavity through a first through hole penetrating through the upper motor cover to form a liquid inlet passage; the second end straight joint is arranged on the upper cover of the motor and is communicated with the hydraulic cavity through a second through hole penetrating through the upper cover of the motor to form a liquid outlet passage.
In an exemplary embodiment of the invention, the number of the concave portions of the pinion gear, the pinion shaft, and the bearing block is two or three or more, the number of the first end through joints is two or three or more, respectively, and the number of the second end through joints is two or three or more, respectively.
In an exemplary embodiment of the internal gear type hydraulic motor placed inside a downhole drilling tool of the present invention, the internal gear type hydraulic motor mechanism further includes a motor cylinder liner fitted over the motor upper cover, the gear assembly, and the motor lower cover, the motor cylinder liner being connected with the key groove of the ring gear of the gear assembly by a connecting key.
In an exemplary embodiment of the invention, the hydraulic motor mechanism further comprises a high pressure hose connecting the first and second end through connections to the hydraulic power source, respectively.
In an exemplary embodiment of the present invention, the fastener may be a draw rod stud assembly that achieves the tight assembly by penetrating the motor upper cover, the gear assembly, and the motor lower cover. For example, the draw rod stud assembly may also be connected with a drive shaft located upstream and/or a lower spindle located downstream.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1a shows a schematic structural diagram of an internal gear type hydraulic motor mechanism for a downhole drilling tool according to an exemplary embodiment of the present invention;
FIGS. 1b and 1c show a right side view and a left side view of FIG. 1a, respectively;
FIG. 2 shows a cross-sectional view of FIG. 1a along section A-A;
FIG. 3 shows a cross-sectional view of FIG. 1a taken along section B-B;
FIG. 4 shows a cross-sectional view of FIG. 1a taken along section C-C;
fig. 5 shows a cross-sectional view of fig. 3 along the D-D section.
The reference numerals are explained below:
1-pull rod stud component, 2-upper flange, 3-end straight joint, 4-motor upper cover, 5-inner gear ring, 6-middle partition plate, 7-bearing block, 8-motor lower cover, 9-lower spindle, 10-sliding bearing, 11-pinion shaft and 12-pinion.
Detailed Description
Hereinafter, the internal gear type hydraulic motor mechanism for a downhole drilling tool of the present invention will be described in detail with reference to exemplary embodiments. It should be noted that "first", "second", "third", "fourth", "fifth", "sixth", "seventh", etc. are merely for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance. "upper," "lower," "inner," and "outer" are merely used for convenience of description and to constitute relative orientations or positional relationships, and do not indicate or imply that the referenced components must have that particular orientation or position.
In an exemplary embodiment of the present invention, an internal gear type hydraulic motor mechanism for a downhole drilling tool may include a first end feedthrough joint, a second end feedthrough joint, fasteners, and an upper motor cover, a gear assembly, and a lower motor cover disposed in that order along a common central axis. Here, the upper motor head is relatively closer to the upper drill string (or upstream of the downhole tool) and the lower motor head is relatively closer to the drill bit and the drilling face (or downstream of the downhole tool).
In the present exemplary embodiment, the gear assembly may include a support block, a pinion gear, a pinion shaft, and an inner gear ring. The supporting block is provided with a concave part and a first through hole arranged along the direction of the central axis, and the concave part is not communicated with the first through hole. For example, the support block may have a pie-like structure with a predetermined thickness, and a recess for receiving the pinion gear may be formed along an outer edge of the pie in a direction toward the central axis. Of course, the recess cannot accommodate the entire pinion gear inside, but leaves teeth that can mate with the ring gear. The pinion is fixedly arranged on the pinion shaft so as to prevent the pinion and the pinion shaft from rotating mutually. The inner gear ring is provided with an inner circumferential wall provided with a tooth socket and an outer wall provided with a key groove. The tooth socket and the pinion form meshing fit, and the key groove can transmit the rotating torque of the inner gear ring to a drill bit for drilling, so that the drill bit is driven to drill through the rotation of the pinion. Here, the number of the concave portions of the pinion gear, the pinion shaft, and the bearing block is the same, and for example, may be two or three or more. The number of the first-end through joints is the same as that of the second-end through joints, and is equal to the number of the pinions, and for example, may be two or three or more, respectively.
The motor upper cover has a second through hole disposed in the central axis direction. The motor lower cover has a third through hole provided in the central axis direction. The upper motor cover and the lower motor cover are connected with the fasteners to tightly assemble the gear assembly so as to achieve the effect of bearing the rotating torque; and the first middle through hole, the second middle through hole and the third middle through hole can be communicated to form a channel for a drilling medium (such as drilling fluid, air, nitrogen and the like) to flow to the bottom of the well. For example, the fasteners may be draw bar stud assemblies, which may be two or more sets. The draw bar stud assembly may be passed sequentially through the upper motor cover, the gear assembly, and the lower motor cover to effect close assembly of the gear assembly between the upper motor cover and the lower motor cover. The draw rod stud assembly may further be connected to a drive shaft located upstream of the downhole drilling tool and/or to a lower mandrel located downstream of the downhole drilling tool.
Both ends of the pinion shaft of the gear assembly may be fixed to the motor upper cover and the motor lower cover by two bearings (e.g., a sliding bearing or a sliding sleeve), respectively, and a hydraulic pressure chamber is formed by the motor upper cover, the ring gear, the recess of the bearing block, the pinion gear, and the motor lower cover. The pinion shaft is fixed between the motor upper cover and the motor lower cover through the bearing, so that the rotation of the pinion in the hydraulic cavity can be more stable.
The first end straight joint is arranged on the motor upper cover and is communicated with the hydraulic cavity through a first through hole penetrating through the motor upper cover to form a liquid inlet passage. The second end straight joint is arranged on the upper cover of the motor and is communicated with the hydraulic cavity through a second through hole penetrating through the upper cover of the motor to form a liquid outlet passage. The liquid inlet passage and the liquid outlet passage and the hydraulic cavity form a hydraulic loop and can be connected with a downhole hydraulic power source through pipelines (such as high-pressure rubber pipes) so as to provide hydraulic driving force for pinions in the gear assembly.
In another exemplary embodiment of the present invention, the internal gear type hydraulic motor mechanism may further include a motor cylinder liner that is fitted around the outside of the motor upper cover, the gear assembly, and the motor lower cover along the central axis, and the motor cylinder liner is connected with the key groove of the ring gear of the gear assembly by a connecting key, based on the structure of the above exemplary embodiment. The motor sleeve cylinder is arranged, so that the rotating torque of the inner gear ring can be more conveniently and stably transmitted to the drill bit for drilling.
In yet another exemplary embodiment of the present invention, an internal gear type hydraulic motor mechanism for a downhole drilling tool may include a first end-to-end joint, a second end-to-end joint, a fastener, and a motor upper cover, a first gear assembly, a first middle spacer, a second gear assembly, a second middle spacer, a third gear assembly, and a motor lower cover sequentially disposed along a same central axis. Here, the upper motor head is relatively closer to the upper drill string (or upstream of the downhole tool) and the lower motor head is relatively closer to the drill bit and the drilling face (or downstream of the downhole tool).
The first gear assembly may include a first support block, a first pinion gear, a first pinion shaft, and a first ring gear. The first supporting block is provided with a first concave part and a first through hole arranged along the direction of the central axis, and the first concave part is not communicated with the first through hole. For example, the first support block may have a pie-like structure with a predetermined thickness, and a recess may be formed along an outer edge of the pie in a direction toward the central axis to receive the first pinion gear. Of course, the first recess portion cannot accommodate the entirety of the first pinion gear therein, but should leave teeth that can be engaged with the first ring gear. The first pinion gear is fixedly arranged on the first pinion shaft so as to be incapable of rotating mutually. The first inner gear ring is provided with an inner circumferential wall provided with a first tooth groove and an outer wall provided with a first key groove.
The second gear assembly may include a second support block, a second pinion gear, a second pinion shaft, and a second ring gear. The second supporting block is provided with a second concave part and a second through hole arranged along the direction of the central axis, and the second concave part is not communicated with the second through hole. For example, the second support block may have a pie-like structure with a predetermined thickness, and a recess may be formed along an outer edge of the pie in a direction toward the central axis to receive the second pinion gear. Of course, the second recess portion cannot accommodate the entirety of the second pinion gear therein, but should leave teeth that can be engaged with the second ring gear. The second pinion gear is fixedly arranged on the second pinion shaft so as to be incapable of rotating mutually. The second ring gear has an inner circumferential wall provided with a second tooth groove and an outer wall provided with a second key groove.
The first middle partition plate is arranged between the first gear assembly and the second gear assembly and is provided with a fourth through hole arranged along the direction of the central axis.
The third gear assembly may include a third support block, a third pinion gear, a third pinion shaft, and a third ring gear. The third supporting block is provided with a third concave part and a third through hole arranged along the direction of the central axis, and the third concave part is not communicated with the third through hole. For example, the third support block may have a pie-like structure with a predetermined thickness, and a recess for receiving the third pinion gear may be formed along an outer edge of the pie in a direction toward the central axis. Of course, the third concave portion cannot accommodate the entirety of the third pinion gear therein, but should leave teeth that can be engaged with the third ring gear. The third pinion gear is fixedly arranged on the third pinion shaft so as to be incapable of rotating mutually. The third ring gear has an inner circumferential wall provided with a third tooth groove and an outer wall provided with a third key groove.
The second middle partition plate is arranged between the second gear assembly and the third gear assembly and is provided with a fifth through hole arranged along the direction of the central axis.
The motor upper cover is provided with a sixth through hole arranged along the direction of the central axis; the motor lower cover has a seventh through hole provided in a direction of the central axis. The upper motor cover and the lower motor cover are connected with the fasteners to tightly assemble the first gear assembly, the first middle partition plate, the second gear assembly, the second middle partition plate and the third gear assembly so as to achieve the effect of bearing the rotating torque; and the sixth through hole, the first through hole, the fourth through hole, the second through hole, the fifth through hole, the third middle hole and the seventh through hole are sequentially communicated to form a channel for a drilling medium (such as drilling fluid, air, nitrogen and the like) to flow to the bottom of the well. For example, the fasteners may be draw bar stud assemblies, which may be two or more sets. The pull rod stud assembly can sequentially pass through the upper motor cover, the first gear assembly, the first middle partition plate, the second gear assembly, the second middle partition plate, the third gear assembly and the lower motor cover so as to realize that each group of gear assemblies and each middle partition plate are tightly assembled between the upper motor cover and the lower motor cover. The draw rod stud assembly may further be connected to a drive shaft located upstream of the downhole drilling tool and/or to a lower mandrel located downstream of the downhole drilling tool.
Both ends of a first pinion shaft of the first gear assembly are fixed to the motor upper cover and the first middle partition plate by two bearings (e.g., sliding bearings or sliding sleeves), respectively, and a first hydraulic pressure chamber is formed by the motor upper cover, the first ring gear, the first concave portion of the first support block, the first pinion gear, and the first middle partition plate. The first pinion shaft is fixed between the motor upper cover and the first center spacer by a bearing, and the rotation of the first pinion in the first hydraulic chamber can be stabilized. Both ends of the second pinion shaft of the second gear assembly are fixed to the first middle partition plate and the second middle partition plate by two bearings (e.g., sliding bearings or sliding sleeves), respectively, and a second hydraulic chamber is formed by the first middle partition plate, the second ring gear, the second concave portion of the second support block, the second pinion, and the second middle partition plate. The second pinion shaft is fixed between the first intermediate partition and the second intermediate partition by the bearing, and the rotation of the second pinion in the second hydraulic chamber can be stabilized. Both ends of a third pinion shaft of the third gear assembly are fixed to the second middle plate and the motor lower cover by two bearings (e.g., sliding bearings or sliding sleeves), respectively, and a third hydraulic pressure chamber is formed by the second middle plate, the third ring gear, the third concave portion of the third support block, the third pinion gear, and the motor lower cover. The third pinion shaft is fixed between the motor lower cover and the second diaphragm through the bearing, and the rotation of the third pinion in the third hydraulic chamber can be more stable.
The first end straight joint is arranged on the upper motor cover and is communicated with the through hole arranged on the upper motor cover, the through hole arranged on the first middle partition plate and the through hole arranged on the second middle partition plate respectively, so that the first hydraulic cavity, the second hydraulic cavity and the third hydraulic cavity are communicated with the first end straight joint, and a liquid inlet passage is formed. The second end straight joint is arranged on the motor upper cover and is communicated with another through hole arranged on the motor upper cover, another through hole arranged on the first middle partition plate and another through hole arranged on the second middle partition plate respectively, so that the first hydraulic cavity, the second hydraulic cavity and the third hydraulic cavity are communicated with the second end straight joint, and a liquid outlet passage is formed. The liquid inlet passage and the liquid outlet passage form a hydraulic loop with the first hydraulic cavity, the second hydraulic cavity and the third hydraulic cavity, and can be connected with a downhole hydraulic power source through pipelines (such as high-pressure rubber pipes) so as to provide hydraulic driving force for each pinion in each group of gear assemblies.
Specifically, the first tooth groove is in meshing fit with the first pinion, the second tooth groove is in meshing fit with the second pinion, the third tooth groove is in meshing fit with the third pinion, and the first key groove, the second key groove and the third key groove can correspondingly transmit the rotating torque of the first inner gear ring, the second inner gear ring and the third inner gear ring to the drill bit for drilling, so that the drill bit is driven to drill through the rotation of the first pinion, the second pinion and the third pinion. Here, the first pinion gear, the first pinion shaft, and the first concave portion of the first support block are the same in number, and may be, for example, two or three or more in number. The number of the second pinion gear, the second pinion shaft, and the second recessed portion of the second support block is the same, and for example, may be two or three or more. The third pinion gear, the third pinion shaft, and the third recessed portion of the third support block are the same in number, and for example, may be two or more in number. The first end through connections and the second end through connections are equal in number and equal in number to the first, second and third pinions, and may be, for example, two or three or more in number.
In another exemplary embodiment of the present invention, the internal gear type hydraulic motor mechanism may further include a motor cylinder liner that is fitted around the outside of the motor upper cover, each gear assembly, each partition plate, and the motor lower cover along the central axis, and the motor cylinder liner is connected with the key groove of the ring gear of the gear assembly by a connecting key, based on the structure of the above-described still another exemplary embodiment. The motor sleeve cylinder is arranged, so that the rotating torque of each inner gear ring in each gear assembly can be conveniently and stably transmitted to the drilling bit.
FIG. 1a shows a schematic structural diagram of an internal gear type hydraulic motor mechanism for a downhole drilling tool according to an exemplary embodiment of the present invention; fig. 1b and 1c show a right side view and a left side view of fig. 1a, respectively. FIG. 2 shows a cross-sectional view of FIG. 1a along section A-A; FIG. 3 shows a cross-sectional view of FIG. 1a taken along section B-B; FIG. 4 shows a cross-sectional view of FIG. 1a taken along section C-C; fig. 5 shows a cross-sectional view of fig. 3 along the D-D section.
As shown in fig. 1a to 5, in an exemplary embodiment, the internal gear type hydraulic motor mechanism for a downhole drilling tool may include a draw rod stud assembly 1, an end through joint 3, a motor upper cover 4, an inner gear ring 5, a middle spacer 6, a support block 7, a motor lower cover 8, a sliding bearing 10, a pinion shaft 11, and a pinion 12. The upper flange 2 may be used to connect the hydraulic motor mechanism of the present exemplary embodiment to a structure upstream of the downhole drilling tool. The lower mandrel 9 may be used to extend and approximate the drilling medium passage formed by the present exemplary embodiment toward the drill bit.
In the present exemplary embodiment, the ring gear type hydraulic motor mechanism for a downhole drilling tool may mainly include three groups of ring gear motors in the axial direction. Each set of gear motors may comprise: a set of pinion gears 12, a set of pinion shafts 11, a support block 7, an inner gear ring 5. Each group of gear motors is separated by a middle clapboard 6. The two ends of the motor are sealed by an upper motor cover 4 and a lower motor cover 8, and all parts are tightly pulled and firmly fixed together by a group of pull rod stud assemblies 1.
The motor upper cover 4 is provided with a through end joint 3 for the inlet and outlet of hydraulic oil, besides a pull rod stud component 1 for tensioning and fixing an upper flange 2, a middle clapboard 6, a supporting block 7 and a lower mandrel 9. The end through connection 3 may be a standard hydraulic connection for connecting a hydraulic hose. The number of the end through-connections 3 is set according to the number of pinions of each group of gear motors. For example, in the case of a single set of gearmotors, 2 end feed-throughs 3 are required for a single pinion, one of which feeds oil and the other of which feeds oil.
The pinion 12 and the ring gear 5 are meshed with each other. The ring gear 5 is provided with a group of rectangular grooves for placing a ring gear flat key and transmitting the rotation torque generated by the ring gear motor through the ring gear flat key. When the hydraulic oil drives the pinion 12 to rotate, the ring gear 5 engaged therewith rotates. The rotational torque generated by the inner gear ring can be transmitted to a drill bit for drilling through other matched pipe fittings.
The sliding bearing 10 may be a sleeve with a high degree of finish and a low coefficient of friction, such as a copper sleeve, to facilitate relative rotation of the pinion shaft and the copper sleeve. Further, as shown in fig. 5, each of the pinion shafts 11 may be provided in a hollow structure so as to form a pressure relief passage, so that oil leaking from the gap may be returned through the pressure relief passage to constitute a more stable and durable seal.
During drilling, a drilling medium (for example, air, nitrogen and other gases or drilling fluid) can flow to the bottom of the well through a hollow hole channel consisting of the upper flange 5, the upper motor cover 4, the middle partition plate 6, the supporting block 7, the lower motor cover 8 and the lower mandrel 9. The hydraulic oil for driving rotation of the pinion 12 may be supplied from a separate downhole oil supply line. When drilling, high-pressure oil can be pumped into a hydraulic cavity formed by the inner gear ring 5, the middle partition plate 6, the supporting block 7 and the pinion 12 through the end straight-through connector 3, an oil inlet of the hydraulic cavity is high-pressure, an oil return port of the hydraulic cavity is low-pressure, so that the pinion 12 is driven to rotate, and through gear transmission, each group of pinions 12 can drive the corresponding inner gear ring 5 to rotate. Key transmission is realized through an inner gear ring flat key arranged in a flat key groove on the inner gear ring 5, so that an underground drill bit is driven to rotate, and underground self-rotating rock breaking is realized.
The internal gear type hydraulic motor mechanism for the downhole drilling tool can be a built-in gear motor integrated in the downhole drilling tool, an internal gear ring of the internal gear type hydraulic motor mechanism is connected with an external rotary cylinder body through a flat key or a spline to transmit torque, the internal gear ring is meshed with pinion gears (pinions) uniformly distributed along the circumference at N (for example, N is 3, 4, 5, 6, 8 and 9), a closed volume is formed between two side plates (an upper motor cover and a middle partition plate or two middle partition plates or the middle partition plate and a lower motor cover) and a supporting block, driving torque can be generated under the action of oil pressure, and the rotating speed is determined by the size of oil supply flow.
In addition, in order to obtain sufficient displacement, the internal gear type hydraulic motor mechanism for a downhole drilling tool of the present invention may be arranged with M (M is 2, 3, 4, 5, 6 …) groups of gear assemblies along the rotation axis of the drilling tool, each group is partitioned by side plates (motor upper cover, middle partition plate, motor lower cover) coated with copper alloy on both sides, the side plates (motor upper cover, middle partition plate, motor lower cover) are provided with flow distribution windows, and the oil passage on the same radial plane (for example, a plane parallel to the B-B section direction in fig. 1 a) of the flow distribution windows are in parallel.
The upper flange can be connected with an internal gear type hydraulic motor by adopting an end face flange and can be fastened by adopting a pull rod stud component. The draw rod stud assembly may have a locating shoulder to act as a pin to transmit torque. The internal gear type hydraulic motor mechanism for the underground drilling tool only bears torque load.
The motor upper cover, the motor lower cover, the supporting block and the middle clapboard of the internal gear type hydraulic motor mechanism for the underground drilling tool can be rigidly connected with the upper flange and the lower mandrel, can rotate along with an upper drill column under the condition of composite drive drilling, and do not move relative to the upper drill column. The internal gear type hydraulic motor mechanism for a down-hole drilling tool of the present invention can provide power to a drill bit by itself when an upper drill string is not rotated, and at this time, the rotation axes of the respective pinions are in a relatively stationary state. The hydraulic oil drives the pinion to rotate, so that the inner gear ring rotates, the outer pipe body is driven to rotate, and the drill bit is driven to rotate and overcome the load.
In conclusion, the hydraulic motor is used as the power tool in the underground drilling tool, so that the problems of large fluctuation of the rotating speed along with the load, easy rotation, poor heat conduction, short service life of the screw and the like of the conventional air screw due to poor gas lubricity and compressibility are solved, and the hydraulic motor has better application value and greater economic benefit.
Compared with the prior art, the beneficial effects of the invention comprise one or more of the following aspects:
firstly, the parallel gear hydraulic motor is adopted as a core rotating component, and the hydraulic technology can be applied to the design of the underground tool;
the gas screw rod needs to improve the revolution and the torque through larger displacement, and the hydraulic motor of the invention needs smaller fluid displacement under the requirements of the same torque and revolution;
the hydraulic motor can be matched with an upstream pneumatic impactor for use;
the hydraulic motor is of a hollow structure, so that drilling fluid can conveniently flow to the bottom of the well, the structure is more reasonable, the design is more ingenious, and the operability is stronger;
the hydraulic oil for driving the hydraulic motor gear to rotate is provided by an independent oil supply system, is irrelevant to a fluid medium (drilling fluid) for drilling, and does not influence the normal drilling medium carrying rock.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (10)
1. An internal gear type hydraulic motor mechanism for a downhole drilling tool is characterized by comprising a first end straight-through joint, a second end straight-through joint, a fastening piece, a motor upper cover, more than two gear components, more than one middle partition plate and a motor lower cover which are coaxially arranged, wherein,
any one of the two or more gear assemblies comprises a supporting block, a pinion shaft and an inner gear ring, wherein the supporting block is provided with a concave part and a first middle hole arranged along the direction of the shaft, the pinion is fixedly arranged on the pinion shaft and arranged in the concave part of the supporting block, the inner gear ring is provided with an inner circumferential wall provided with a tooth groove and an outer wall provided with a key groove, the key groove can transmit the rotating torque of the inner gear ring to a drilling bit, and the tooth groove is meshed with the pinion;
the number of the more than one middle partition plates is one less than that of the more than two gear assemblies, any middle partition plate in the more than one middle partition plates is arranged between two adjacent gear assemblies in the more than two gear assemblies, and any middle partition plate is provided with a second middle hole arranged along the direction of the shaft;
the motor upper cover is provided with a third middle hole arranged along the direction of the shaft, the motor lower cover is provided with a fourth middle hole arranged along the direction of the shaft, the motor upper cover and the motor lower cover are connected with the fastening piece to tightly assemble the more than two gear assemblies and the more than one middle partition plate, and the first middle hole, the second middle hole, the third middle hole and the fourth middle hole are communicated to form a channel for a drilling medium to flow to a well bottom, two ends of a pinion shaft of the gear assembly close to the motor upper cover in any gear assembly are respectively fixed on the motor upper cover and the middle partition plate through bearings, an upper hydraulic cavity is formed through the motor upper cover, the inner gear ring, the supporting block, the pinion and the middle partition plate, two ends of the pinion shaft of the gear assembly close to the motor lower cover in any gear assembly are respectively fixed on the motor lower cover and the middle partition plate through bearings, a lower hydraulic cavity is formed by a motor lower cover, an inner gear ring, a supporting block, a pinion and a middle partition plate, two ends of a pinion shaft of a gear assembly positioned between two adjacent middle partition plates in any gear assembly are respectively fixed on the two adjacent middle partition plates through bearings, and a middle hydraulic cavity is formed by the two adjacent middle partition plates, the inner gear ring, the supporting block and the pinion;
the first end straight joint is arranged on the upper cover of the motor and is used for communicating the upper hydraulic cavity, the middle hydraulic cavity and the lower hydraulic cavity through first through holes respectively penetrating through the upper cover of the motor and any one of the middle partition plates so as to form a liquid inlet passage;
the second end straight joint is arranged on the upper motor cover and is communicated with the upper hydraulic cavity, the middle hydraulic cavity and the lower hydraulic cavity through second through holes respectively penetrating through the upper motor cover and any middle partition plate so as to form a liquid outlet passage.
2. The internal gear type hydraulic motor mechanism according to claim 1, wherein the number of the recesses of the pinion gear, the pinion shaft, and the bearing block in any one gear assembly is two or three or more, the number of the first-end through joints is two or three or more, respectively, and the number of the second-end through joints is two or three or more, respectively.
3. The internal gear type hydraulic motor mechanism according to claim 1, further comprising a motor cylinder liner fitted around the motor upper cover, the two or more gear assemblies, the one or more middle bulkheads, and the motor lower cover, wherein the motor cylinder liner is connected to a key groove of an inner ring gear of any one of the gear assemblies by a connecting key.
4. The internal gear type hydraulic motor mechanism according to claim 1, wherein the fastener is a draw rod stud assembly which achieves the close assembly by penetrating a motor upper cover, the two or more gear assemblies, the one or more midplanes, and a motor lower cover.
5. An internal gear type hydraulic motor mechanism for a downhole drilling tool is characterized by comprising a first end straight joint, a second end straight joint, a fastening piece, a motor upper cover, a gear assembly and a motor lower cover which are coaxially and sequentially arranged, wherein,
the gear assembly comprises a supporting block, a pinion shaft and an inner gear ring, wherein the supporting block is provided with a concave part and a first through hole arranged along the direction of the shaft, the pinion is fixedly arranged on the pinion shaft and arranged in the concave part of the supporting block, the inner gear ring is provided with an inner circumferential wall provided with a tooth groove and an outer wall provided with a key groove, the key groove can transmit the rotating torque of the inner gear ring to a drill bit for drilling, and the tooth groove is meshed with the pinion;
the motor upper cover is provided with a second middle through hole arranged along the direction of the shaft, the motor lower cover is provided with a third middle through hole arranged along the direction of the shaft, the motor upper cover and the motor lower cover are connected with the fastening piece to tightly assemble the gear assembly, the first middle through hole, the second middle through hole and the third middle through hole are communicated to form a channel for a drilling medium to flow to the well bottom, two ends of the pinion shaft are respectively fixed on the motor upper cover and the motor lower cover through bearings, and a hydraulic cavity is formed by the motor upper cover, the inner gear ring, the concave part of the supporting block, the pinion and the motor lower cover;
the first end straight joint is arranged on the upper motor cover and is communicated with the hydraulic cavity through a first through hole penetrating through the upper motor cover to form a liquid inlet passage;
the second end straight joint is arranged on the upper cover of the motor and is communicated with the hydraulic cavity through a second through hole penetrating through the upper cover of the motor to form a liquid outlet passage.
6. The internal gear type hydraulic motor mechanism according to claim 5, wherein the number of the concave portions of the pinion gear, the pinion shaft, and the bearing block is two or three or more, the number of the first end through joints is two or three or more, respectively, and the number of the second end through joints is two or three or more, respectively.
7. The internal gear type hydraulic motor mechanism according to claim 5, further comprising a motor cylinder liner fitted around the outside of the motor upper cover, the gear assembly and the motor lower cover, the motor cylinder liner being connected to the key groove of the ring gear of the gear assembly by a connecting key.
8. An internally-engaged gear type hydraulic motor mechanism according to claim 1 or 5, further comprising high-pressure hoses connecting the first and second end through-connections to the hydraulic power source, respectively.
9. The internal gear type hydraulic motor mechanism according to claim 5, wherein the fastener is a draw rod stud assembly which achieves the tight assembly by penetrating a motor upper cover, a gear assembly and a motor lower cover.
10. An internally geared hydraulic motor mechanism according to claim 4 or 9, wherein the tie rod stud assembly is further connectable to an upstream drive shaft and/or a downstream lower spindle.
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| CN201910812336.0A CN112443448B (en) | 2019-08-30 | 2019-08-30 | Internal engaged gear type hydraulic motor mechanism for downhole drilling tool |
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| CN201910812336.0A CN112443448B (en) | 2019-08-30 | 2019-08-30 | Internal engaged gear type hydraulic motor mechanism for downhole drilling tool |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114352270A (en) * | 2022-03-18 | 2022-04-15 | 四川圣诺油气工程技术服务有限公司 | Identification system for tubing operation coupling without killing well |
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