阅读说明：本技术 一种容积式定轴旋转井下动力马达 (Positive displacement fixed-shaft rotary underground power motor ) 是由 叶哲伟 易钦珏 罗良 冯康 谭浪 于 2020-08-04 设计创作，主要内容包括：本发明涉及一种容积式定轴旋转井下动力马达,包括防掉总成、动力总成、联轴器总成和轴承总成,动力总成由多级动力短节组成,动力总成上部接防掉总成,下部接联轴器总成,联轴器总成下部接轴承总成。动力短节包括定子壳体、转子主轴、主轴套筒、叶片、弧形轨道和挡板,弧形轨道与叶片组成的构件安装于主轴套筒的凹槽中,当钻井液流过定子壳体内部,在挡板的作用下,该构件在凹槽中作往复运动的同时带动主轴套筒旋转,主轴套筒通过花键连接带动转子主轴旋转。本发明动力短节的叶片通过弧形轨道的往复运动实现径向伸缩；动力短节内部钻井液从对称方向流入流出,转子主轴在定轴旋转的同时稳定性好。(The invention relates to a positive displacement fixed-shaft rotary underground power motor which comprises an anti-drop assembly, a power assembly, a coupling assembly and a bearing assembly, wherein the power assembly consists of multi-stage power short sections, the upper part of the power assembly is connected with the anti-drop assembly, the lower part of the power assembly is connected with the coupling assembly, and the lower part of the coupling assembly is connected with the bearing assembly. The power nipple comprises a stator shell, a rotor spindle, a spindle sleeve, blades, an arc-shaped track and a baffle, wherein a component formed by the arc-shaped track and the blades is arranged in a groove of the spindle sleeve, when drilling fluid flows through the inside of the stator shell, the component reciprocates in the groove and simultaneously drives the spindle sleeve to rotate under the action of the baffle, and the spindle sleeve drives the rotor spindle to rotate through a spline connection band. The blades of the power nipple joint realize radial expansion through the reciprocating motion of the arc-shaped track; drilling fluid in the power nipple flows in and out from the symmetrical direction, and the stability of the rotor main shaft is good when the fixed shaft rotates.)

1. The invention relates to a positive displacement fixed-shaft rotary underground power motor which comprises an anti-drop assembly, a power assembly, a coupling assembly and a bearing assembly, wherein the power assembly consists of multi-stage power short sections, the upper part of the power assembly is connected with the anti-drop assembly, the lower part of the power assembly is connected with the coupling assembly, and the lower part of the coupling assembly is connected with the bearing assembly.

2. A positive displacement, fixed axis, rotary downhole power motor as claimed in claim 1, wherein: the upper end of the stator shell of the power assembly is provided with a conical thread, and the upper end of the stator shell of the power assembly is connected with the anti-falling assembly by the conical thread; the lower end of a stator shell of the power assembly is provided with a conical thread, and the lower end of the stator shell of the power assembly is connected with the coupling assembly by the conical thread; the coupling assembly and the bearing assembly are connected by adopting taper threads.

3. A positive displacement, fixed axis, rotary downhole power motor as claimed in claim 1, wherein: the power assembly consists of n (n is a natural number greater than 0) power short sections, and stator shells of the power short sections are connected with each other by adopting conical threads; a rotor main shaft is arranged in a main shaft sleeve of the power short section, the rotor main shafts of two adjacent power short sections are connected by adopting tapered threads, the main shaft sleeve is provided with an internal spline, the rotor main shaft is provided with an external spline, and the main shaft sleeve is connected with the rotor main shaft by adopting a spline; and baffles are arranged on the upper end surface and the lower end surface of the main shaft sleeve of the power nipple.

4. A positive displacement, fixed axis, rotary downhole power motor as claimed in claim 3, wherein: the lower end face of the baffle is provided with a wear-resistant material, the baffle is provided with a waist-shaped hole, and a sleeve and a cylindrical pin are arranged between the baffle and the stator shell of the power nipple.

5. A positive displacement, fixed axis, rotary downhole power motor as claimed in claim 1, wherein: a groove is formed in a main shaft sleeve of the power nipple, an arc-shaped rail is arranged in the groove, the arc-shaped rail is provided with a groove, the arc-shaped rail and the groove in the main shaft sleeve are in clearance fit, and the fit clearance is lubricated by drilling fluid; and blades are arranged at two ends of the arc-shaped track and are respectively contacted with the arc-shaped track and the stator shell of the power nipple through wear-resistant materials.

6. A positive displacement, fixed axis, rotary downhole power motor as claimed in claims 1, 3 and 4, wherein: the baffle plate, the main shaft sleeve, the blades and the stator shell of the power nipple are assembled to form a liquid inlet flow channel I, a liquid inlet flow channel II, a liquid discharge flow channel I and a liquid discharge flow channel II; the liquid inlet flow channel I and the liquid inlet flow channel II are symmetrical about the main shaft sleeve, and the liquid drainage flow channel I and the liquid drainage flow channel II are symmetrical about the main shaft sleeve.

7. A positive displacement, fixed axis, rotary downhole power motor as claimed in claim 1, wherein: the inner surface curve of the stator shell of the power nipple is composed of four sections of circular arcs and four sections of transition curves.

Technical Field

The invention relates to the technical field of oil exploitation, in particular to a positive displacement fixed-shaft rotary underground power motor.

Background

In oil and gas production, oil wells are increasingly being developed towards deep formations. The more complex the formation structure as the depth of the borehole increases, the longer it takes to complete a well. In order to reduce the drilling cost and the total drilling time, the drilling industry has invented underground power motors, such as a screw motor, a turbine motor and the like. These downhole power motors have played their own role in the actual use of many oil fields, but have many problems.

In the screw motor, the screw revolves to generate a larger centrifugal force in the rotating process, so that radial swinging is generated, and a universal shaft connected with the screw is a weak point, is volatile and has low reliability; the turbine motor has high rotating speed, non-linearity and small torque, a plurality of wearing parts and strict control on bit pressure; therefore, there is a need for a downhole power motor with a fixed shaft rotating, stable operation, low rotation speed and large torque, and a positive displacement downhole power motor with a fixed shaft rotating motor is proposed to solve the above technical drawbacks.

Disclosure of Invention

The invention aims to provide a positive displacement fixed-shaft rotating underground power motor, wherein a rotor spindle has good stability, small energy loss and high reliability in the fixed-shaft rotating process.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a positive displacement fixed-shaft rotary underground power motor comprises an anti-drop assembly, a power assembly, a coupler assembly and a bearing assembly, wherein the power assembly is composed of multi-stage power short sections, the upper portion of the power assembly is connected with the anti-drop assembly, the lower portion of the power assembly is connected with the coupler assembly, and the lower portion of the coupler assembly is connected with the bearing assembly.

Furthermore, the upper end of a stator shell of the power assembly is provided with a conical thread, and the upper end of the stator shell of the power assembly is connected with the anti-falling assembly by the conical thread; the lower end of a stator shell of the power assembly is provided with a conical thread, and the lower end of the stator shell of the power assembly is connected with the coupling assembly by the conical thread; the coupling assembly and the bearing assembly are connected by adopting taper threads.

Furthermore, the power assembly consists of n (n is a natural number greater than 0) power short sections, and stator shells of the power short sections are connected with each other by adopting conical threads; a rotor main shaft is arranged in a main shaft sleeve of the power short section, the rotor main shafts of two adjacent power short sections are connected by adopting tapered threads, the main shaft sleeve is provided with an internal spline, the rotor main shaft is provided with an external spline, and the main shaft sleeve is connected with the rotor main shaft by adopting a spline; the upper end face and the lower end face of a main shaft sleeve of the power short section are provided with baffle plates, the lower end face of each baffle plate is provided with a wear-resistant material, each baffle plate is provided with a waist-shaped hole, a sleeve and a cylindrical pin are arranged between each baffle plate and a stator shell of the power short section, each sleeve is used for limiting the movement of each baffle plate in the axial direction, each cylindrical pin is used for limiting the rotation of each baffle plate in the circumferential direction, and the axial force received by each main shaft sleeve is transmitted and borne through extrusion between the main shaft sleeve and the contact faces of the upper baffle.

Further, a groove is formed in a main shaft sleeve of the power nipple, an arc-shaped rail is arranged in the groove, the groove is formed in the arc-shaped rail, the arc-shaped rail is in clearance fit with the groove in the main shaft sleeve, and the fit clearance is lubricated by drilling fluid; the blade has rotation range in radial space for the arc track, realize the space dislocation through the orbital recess of arc between the arc track.

Further, a liquid inlet flow channel I, a liquid inlet flow channel II, a liquid discharge flow channel I and a liquid discharge flow channel II are formed after the baffle plate, the main shaft sleeve, the blades, the arc-shaped track and the stator shell of the power nipple are assembled; the liquid inlet flow channel I and the liquid inlet flow channel II are symmetrical about the main shaft sleeve, and the liquid drainage flow channel I and the liquid drainage flow channel II are symmetrical about the main shaft sleeve. The upper end of the stator shell is provided with a baffle plate, the baffle plate blocks the liquid discharge flow passage I and the liquid discharge flow passage II, and drilling fluid flows in from the liquid inlet flow passage I and the liquid inlet flow passage II; the lower extreme of stator casing is provided with the baffle, baffle shutoff inlet flow way I and inlet flow way II, and drilling fluid flows from flowing back flow way I and flowing back flow way II. When drilling fluid flows through the interior of the stator shell, the drilling fluid flows from the liquid inlet flow channel I and the liquid inlet flow channel II to the liquid discharge flow channel I and the liquid discharge flow channel II under the action of the baffle; the blades are driven by drilling fluid to radially stretch and retract through the reciprocating motion of the arc-shaped rail in the groove of the main shaft sleeve, so that the closed space between every two adjacent blades is changed, the main shaft sleeve is driven to rotate in a fixed shaft mode, and the main shaft sleeve drives the rotor main shaft to rotate in a fixed shaft mode through the spline connection band.

Furthermore, the inner surface curve of the stator shell of the power nipple is composed of four sections of circular arcs and four sections of transition curves, and the inner surface curve enables the moving speed of the blades along the radial direction to meet flexible impact, so that the abrasion is small, and the energy loss is small.

Compared with the prior art, the invention has the following beneficial effects:

1. in the invention, the liquid inlet flow channel and the liquid discharge flow channel in the power nipple are respectively symmetrical about the rotor spindle, so the rotor spindle is theoretically free from radial force and centrifugal force, and the rotor spindle has good stability while rotating in a fixed axis;

2. the power assembly adopts the multi-stage power short sections, can set the power stages according to actual requirements, is convenient to maintain, can prolong the service life of the power assembly by periodically replacing the main shaft sleeve of each stage of power short section, and is beneficial to reducing the cost;

3. the drilling fluid drives the main shaft sleeve to rotate by pushing the blades, and the main shaft sleeve drives the rotor main shaft to rotate through the spline, so that the torque is large and the force is sufficient;

4. in the invention, the blades can radially extend and retract through the reciprocating motion of the arc-shaped rail in the groove of the main shaft sleeve, and the blades have a rotating range in a radial space relative to the arc-shaped rail, so that the reliability is high; the blades are respectively contacted with the arc-shaped track and the stator shell by adopting wear-resistant materials, so that the energy loss is small; the fit clearance between the main shaft sleeve and the arc-shaped track is lubricated by drilling fluid;

5. the positive displacement fixed-shaft rotary underground power motor has compact and simple structure and good output torque uniformity;

6. in the invention, a rotor main shaft in a power assembly is connected with a transmission shaft in a bearing assembly by adopting a flexible shaft, and the flexible shaft is coaxial by the elasticity of the flexible shaft.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view of the device of FIG. 1A-A;

FIG. 3 is a schematic view of the construction of the spindle sleeve;

FIG. 4 is a schematic structural view of an arcuate track;

FIG. 5 is a schematic view of the structure of the baffle;

FIG. 6 is a schematic structural view of a rotor spindle;

FIG. 7 is a functional schematic of the present invention;

FIG. 8 is an enlarged partial view of the powertrain;

FIG. 9 is a cross-sectional view of FIGS. 1B-B;

FIG. 10 is a cross-sectional view of FIG. 3;

in the figure: 1-anti-drop assembly, 2-power assembly, 3-coupler assembly, 4-bearing assembly, 5-baffle, 5-1-baffle I, 5-2-baffle II, 5-3-baffle III, 5-4-baffle IV, 5-5-baffle V, 5-6-baffle VI, 6-stator shell I, 7-nylon (high-strength wear-resistant material), 8-blade, 8-1-blade I, 8-2-blade II, 9-main shaft sleeve, 10-arc track, 11-rotor main shaft, 12-stator shell II, 13-stator shell III, 14-sleeve I, 15-sleeve II, 16-sleeve III, 17-cylindrical pin, a-liquid inlet flow channel I, b-a liquid inlet flow passage II, c-a liquid discharge flow passage I, d-a liquid discharge flow passage II, e-a groove I, g-a groove II, f-a groove III, h-a groove IV, i-a groove V, j-a kidney-shaped hole and k-a groove VI.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, the displacement type fixed-shaft rotary downhole power motor disclosed by the invention comprises an anti-drop assembly 1, a power assembly 2, a coupling assembly 3 and a bearing assembly 4, wherein the power assembly 2 consists of a plurality of stages of power nipples, the upper part of the power assembly 2 is connected with the anti-drop assembly 1, the lower part of the power assembly is connected with the coupling assembly 3, and the lower part of the coupling assembly 3 is connected with the bearing assembly 4. The power assembly 2 comprises a stator shell I6, a stator shell II 12, a stator shell III 13, a main shaft sleeve 9, a rotor main shaft 11, blades 8, an arc-shaped track 10 and a baffle 5. The upper end of a stator shell I6 of the power assembly 2 is provided with a conical thread, and the upper end of the stator shell I6 of the power assembly 2 is connected with the anti-falling assembly 1 by adopting the conical thread; the lower end of the stator shell I6 is provided with a conical thread, the upper end of the stator shell II 12 is provided with a conical thread, and the stator shell I6 and the stator shell II 12 are connected through the conical thread; the upper end of the stator shell III 13 is provided with a conical thread, the lower end of the stator shell II 12 is provided with a conical thread, and the stator shell III 13 is connected with the stator shell II 12 through the conical thread; the lower end of a stator shell III 13 of the power assembly 2 is provided with a conical thread, and the lower end of the stator shell III 13 of the power assembly 2 is connected with the coupling assembly 3 by adopting the conical thread; the coupling assembly 3 and the bearing assembly 4 are connected by adopting taper threads.

As shown in fig. 1, 2, 3, 5, 6, 8, and 9, the power assembly 2 is composed of n (n is a natural number greater than 0) power sub-joints.

Taking n as an example of 3, the power assembly 2 consists of three power short sections, and a stator shell I6, a stator shell II 12 and a stator shell III 13 of the three power short sections are connected with each other by adopting tapered threads; the rotor main shafts 11 of the three power short sections are connected with each other by adopting conical threads; the main shaft sleeve 9 is provided with an internal spline, the rotor main shaft 11 is provided with an external spline, and the main shaft sleeve 9 and the rotor main shaft 11 are connected through a spline; the upper end face and the lower end face of a main shaft sleeve 9 of the power nipple are provided with baffle plates 5, the lower end face of each baffle plate 5 is provided with a wear-resistant material, each baffle plate 5 is provided with a waist-shaped hole j, and a sleeve I14, a sleeve II 15, a sleeve III 16 and a cylindrical pin 17 are arranged between each baffle plate 5 and a stator shell I6, a stator shell II 12 and a stator shell III 13 of the power nipple. External threads are arranged on the outer surfaces of the sleeve I14, the sleeve II 15 and the sleeve III 16, internal threads are arranged on the inner surfaces of the stator shell I6, the stator shell II 12 and the stator shell III 13, the sleeve I14, the sleeve II 15 and the sleeve III 16 are in threaded connection with the stator shell I6, the stator shell II 12 and the stator shell III 13, and the sleeve I14, the sleeve II 15 and the sleeve III 16 are used for limiting the baffle 5 to move along the axial direction; the baffle 5 is provided with recess VIk, cylindric lock 17 sets up between recess VIk and stator casing I6, stator casing II 12 and stator casing III 13, cylindric lock 17 is used for restricting baffle 5 along the rotation of circumferencial direction, the axial force that the main shaft sleeve 9 received transmits and bears through the extrusion between main shaft sleeve 9 and the 5 contact surfaces of upper and lower baffle.

As shown in fig. 2, 3, 4 and 10, a groove ie, a groove ig and a groove iiif are arranged in the spindle sleeve 9, the groove ig is a through groove, and the blade 8 is placed in the groove ig; the groove ie and the groove IIIf are not through grooves, and the arc-shaped track 10 is placed in the groove ie and the groove IIIf; the arc-shaped track 10 is provided with a groove IVh; the arc-shaped rail 10 is placed in a groove ie in the spindle sleeve 9, and the arc-shaped rail 10 is in clearance fit with the groove ie in the spindle sleeve 9; the arc-shaped rail 10 is placed in a groove IIIf in the spindle sleeve 9, and the arc-shaped rail 10 is in clearance fit with the groove IIIf in the spindle sleeve 9; the fit clearance is lubricated by drilling fluid; the arc-shaped rails 10 are mutually staggered in space through the grooves IVh; blades 8 are arranged at two ends of the arc-shaped track 10, the blades 8 are in contact with the end face groove Vi of the arc-shaped track 10, the stator shell I6, the stator shell II 12 and the stator shell III 13 through wear-resistant materials, and the wear-resistant materials are preferably nylon 7; the blades 8 are placed in grooves II g in the spindle sleeve 9, and the blades 8 have a rotation range along the radial space in the grooves II g in the spindle sleeve 9.

As shown in fig. 1, 2, 3, 4, 5, 6 and 7, a baffle plate i 5-1, a baffle plate ii 5-2, a baffle plate iii 5-3, a baffle plate iv 5-4, a baffle plate v 5-5, a baffle plate vi 5-6, a main shaft sleeve 9, a blade 8, an arc rail 10, a stator housing i 6, a stator housing ii 12 and a stator housing iii 13 of the power sub are assembled to form a liquid inlet flow channel ia, a liquid inlet flow channel iib, a liquid discharge flow channel ic and a liquid discharge flow channel iid; the liquid inlet flow channel Ia and the liquid inlet flow channel IIb are symmetrical about the main shaft sleeve 9, and the liquid discharge flow channel ic and the liquid discharge flow channel IId are symmetrical about the main shaft sleeve 9; drilling fluid flows in and out from the waist-shaped holes j of the baffle 5; the baffle I5-1, the baffle III 5-3 and the baffle V5-5 are liquid inlet baffles 5, the baffle I5-1, the baffle III 5-3 and the baffle V5-5 are arranged at the upper ends of the stator shell I6, the stator shell II 12 and the stator shell III 13, the baffle I5-1, the baffle III 5-3 and the baffle V5-5 block a liquid outlet flow channel ic and a liquid outlet flow channel IId, and drilling fluid flows in from the liquid inlet flow channel Ia and the liquid inlet flow channel IIb; the liquid inlet flow passage I and the liquid inlet flow passage II are blocked by the baffle II 5-2, the baffle IV 5-4 and the baffle VI 5-6, the baffle II 5-2, the baffle IV 5-4 and the baffle VI 5-6 are arranged at the lower ends of the stator shell I6, the stator shell II 12 and the stator shell III 13, the liquid inlet flow passage I a and the liquid inlet flow passage II b are blocked by the baffle II 5-2, the baffle IV 5-4 and the baffle VI 5-6, and drilling liquid flows out of the liquid outlet flow passage I c and the liquid outlet flow passage II d. When drilling fluid flows through the inner spaces of the stator shell I6, the stator shell II 12 and the stator shell III 13, under the action of the baffles 5 arranged on the upper end face and the lower end face of each of the stator shell I6, the stator shell II 12 and the stator shell III 13, the drilling fluid flows in from the liquid inlet flow channel Ia and the liquid inlet flow channel IIb through the waist-shaped hole j and flows out from the liquid drainage flow channel ic and the liquid drainage flow channel IId; when drilling fluid flows through the surface of the blade 8, the contact area of the blade I8-1 and the drilling fluid is larger than the contact area of the blade II 8-2 and the drilling fluid, under the pushing of the drilling fluid, the torque generated by the blade I8-1 is larger than the torque generated by the blade II 8-2, so that the blade 8 can rotate clockwise, the blade 8 can radially stretch out and draw back through the reciprocating motion of the arc-shaped track 10 in the groove ie and the groove IIIf, so that the closed space between the two adjacent blades 8 is changed, the main shaft sleeve 9 is driven to rotate in a fixed axis manner, and the main shaft sleeve 9 is connected with the movable rotor main shaft 11 through splines to rotate in a fixed axis manner.

As shown in fig. 7, the inner surface curve of the stator housing i 6 (stator housing ii 12/stator housing iii 13) of the power sub is composed of four arcs and four transition curves, and the inner surface curve enables the moving speed of the blade 8 along the radial direction to satisfy flexible impact, and is small in abrasion and energy loss.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that all such changes and modifications as fall within the true spirit and scope of the invention be considered as within the following claims.