CN118292765A - Short-bending transmission shaft - Google Patents

Abstract

The invention belongs to the technical field of drilling, and particularly relates to a short-bending transmission shaft. The short-bending transmission shaft comprises a transmission shaft assembly, a short-bending assembly and a power output assembly, wherein the short-bending assembly is arranged between the transmission shaft assembly and the power output assembly, and is configured to enable the transmission shaft assembly and the power output assembly to incline mutually and transmit torque of the transmission shaft assembly to the power output assembly. The invention can shorten the distance from the bending point of the bending shell power drilling tool to the drill bit and improve the slope.

Description

Short-bending transmission shaft

Technical Field

The invention belongs to the technical field of drilling, and particularly relates to a short-bending transmission shaft.

Background

Along with the continuous deep entry of the oil and gas exploration and development process, the exploration force of deep wells and ultra-deep wells is continuously increased, and the directional wells and the horizontal wells become common construction wells. Along with the mass emergence of directional wells, horizontal wells and branch horizontal wells, power drilling tools such as screws, turbines and the like are used as a guiding tool in the drilling process, and are effective tools for improving the mechanical drilling rate in compound drilling.

In the prior art, the composite power drilling tool comprises a top drive mechanism, a universal assembly, a motor drive, a transmission shaft assembly, a power output assembly and a drill bit which are sequentially arranged from top to bottom. The top drive mechanism can drive the universal assembly, the transmission shaft assembly and the shell of the power output assembly to rotate in the rotating process. The motor drive can drive the universal assembly and the internal parts of the transmission shaft assembly to rotate in the rotating process, so that the drill bit is driven to rotate. When the compound drilling is carried out, the top drive mechanism and the motor are driven to rotate simultaneously to carry out straight drilling. When directional drilling is needed, the top drive mechanism stops rotating, the bending direction of the universal assembly faces the direction of the directional drilling, then the motor is started to drive the drill bit to rotate, and meanwhile pressure is applied downwards, so that the drill bit can drill.

In the process of directional drilling, construction progress is often affected due to the problem of drilling a build rate. Currently, in order to increase the build rate of a drilling tool, a method of shortening the length of a transmission shaft assembly is generally used, so that the distance from a universal assembly (i.e. a bending point of the drilling tool) to a drill bit is shortened. However, in order to ensure the transmission accuracy, the length of the transmission shaft assembly is difficult to be greatly shortened, and the effect is very little.

Therefore, how to increase the build rate of the drilling tool and reduce the sliding proportion in the directional construction process is a technical problem to be solved by those skilled in the art.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide a short-bending transmission shaft which can shorten the distance from a bending point to a drill bit and improve the build-up rate.

According to the present invention, there is provided a stub shaft comprising a drive shaft assembly, a stub shaft assembly and a power take-off assembly, the stub shaft assembly being disposed between the drive shaft assembly and the power take-off assembly, the stub shaft assembly being configured to tilt the drive shaft assembly and the power take-off assembly relative to each other and to transmit torque of the drive shaft assembly to the power take-off assembly.

In a specific embodiment, the short bending assembly comprises a bending shell and a spherical tooth connecting shaft arranged in the bending shell, convex spherical teeth are arranged at two ends of the spherical tooth connecting shaft, and concave spherical teeth matched with the spherical teeth of the spherical tooth connecting shaft are arranged at the end parts of the transmission shaft assembly and the power output assembly.

In a specific embodiment, the convex spherical teeth are hemispherical, and through holes are arranged at the central axes of the spherical teeth connecting shaft and the convex spherical teeth.

In a specific embodiment, the external diameter of the convex spherical teeth is larger than the external diameter of the spherical teeth connecting shaft, an upper locking buckle for placing the convex spherical teeth to deviate from is arranged at the end part of the transmission shaft assembly connected with the convex spherical teeth, and a lower locking buckle for placing the convex spherical teeth to deviate from is arranged at the end part of the power output assembly connected with the convex spherical teeth.

In a specific embodiment, the upper and lower latches are capable of making rigid contact with the ball tooth connection shaft when the ball tooth connection shaft is tilted with respect to the drive shaft assembly and the power take off assembly, thereby limiting the angle of tilt of the ball tooth connection shaft.

In a specific embodiment, the upper locking buckle and the lower locking buckle are of annular structures provided with stepped holes, the major diameters of the upper locking buckle and the lower locking buckle are respectively connected with the transmission shaft assembly and the power output assembly, and the minor diameters of the upper locking buckle and the lower locking buckle are used for rigidly contacting with the spherical tooth connecting shaft.

In a specific embodiment, the button connecting shaft comprises a first shaft section and a second shaft section, and the first shaft section and the second shaft section are fixedly connected after the upper locking buckle and the lower locking buckle are arranged on the button connecting shaft.

In a specific embodiment, the drive shaft assembly comprises: the power main shaft and the outer shell body are arranged outside the power main shaft through a bearing, the outer shell body is connected with the bent outer shell through a middle joint, and concave spherical teeth used for being connected with convex spherical teeth at the upper end of the spherical tooth connecting shaft are arranged at the lower end of the power main shaft.

In a specific embodiment, wear rings are provided at both ends of the bearing.

In a specific embodiment, the power output assembly comprises an output spindle, and concave buttons for connecting with convex buttons at the lower end of the button connecting shaft are arranged at the upper end of the output spindle.

Compared with the prior art, the application has the following advantages.

The short-bending transmission shaft provided by the invention transfers the bending point of the power drilling tool with the bent shell to the lower part of the transmission shaft assembly, shortens the distance between the bending point and the drill bit by the length of one transmission shaft, and increases the build-up rate as the distance between the bending point and the drill bit is shorter. Therefore, the invention can improve the build-up rate of the drilling tool and improve the directional drilling efficiency.

Drawings

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic view of one embodiment of a stub shaft in accordance with the present invention;

FIG. 2 shows a schematic view of one embodiment of a short bend assembly according to the present invention;

FIG. 3 shows a schematic perspective view of a cam tooth according to the present invention;

FIG. 4 shows a schematic end view of a buttons according to the present invention;

FIG. 5 shows a schematic view of the connection of the button connection shaft to the upper and lower buttons in accordance with the present invention;

FIG. 6 shows a schematic view of a first embodiment of a tooth section of upper and lower buttons according to the present invention;

FIG. 7 shows a schematic view of a second embodiment of a tooth profile cross-section of upper and lower buttons in accordance with the present invention;

FIG. 8 shows a schematic view of a third embodiment of a tooth profile cross-section of upper and lower buttons in accordance with the present invention;

FIG. 9 shows a schematic view of a fourth embodiment of a tooth profile cross-section of upper and lower buttons in accordance with the present invention;

FIG. 10 shows a schematic view of a fifth embodiment of a tooth profile cross-section of upper and lower buttons in accordance with the present invention;

fig. 11 shows a schematic view of a sixth embodiment of a tooth profile cross-section of upper and lower buttons according to the present invention.

In the figure: 1. a power main shaft; 2. an adjustment pad; 3. tightly pushing the nut; 4. an outer housing; 5. an anti-abrasion static ring is arranged on the upper part; 6. an anti-abrasion moving coil is arranged on the upper part; 7. a bearing; 8. the static ring is tightly propped against the sleeve; 9. the movable coil is tightly propped against the sleeve; 10. a lower anti-abrasion static ring; 11. a lower anti-abrasion moving coil; 12. a middle joint; 13. locking buckles; 14. a ball tooth connecting shaft; 15. a lower locking buckle; 16. a curved housing; 17. a lower joint; 18. an output spindle; 21. concave spherical teeth; 22. upper convex spherical teeth; 23. a first shaft section; 24. a second shaft section; 25. lower convex spherical teeth; 26. concave spherical teeth; 30. a drive shaft assembly; 40. a short bend assembly; 50. and a power take-off assembly.

In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.

Detailed Description

The invention is described below with reference to the accompanying drawings.

It should be noted that, in the present application, the direction of the present application near the wellhead during drilling is described as "upper" or the like, i.e., the left side of fig. 1, and the direction away from the wellhead is described as "lower" or the like, i.e., the right side of fig. 1. They are not intended to limit the absolute position of the parts involved, but may vary according to the specific circumstances.

Fig. 1 shows a structure of a stub shaft 100 according to the present invention, which includes a drive shaft assembly 30, a stub shaft assembly 40, and a power take-off assembly 50, as shown in fig. 1, the stub shaft assembly 40 being disposed between the drive shaft assembly 30 and the power take-off assembly 50, a rotor portion (i.e., a power spindle 1) of the drive shaft assembly 30 being for connection to a motor drive (not shown), and a housing stator portion (i.e., a housing body 4) of the drive shaft assembly 30 being for connection to a top drive mechanism (not shown). The stub shaft assembly 40 tilts the drive shaft assembly 30 and the power take-off assembly 50 relative to each other and transfers torque from the drive shaft assembly 30 to the power take-off assembly 50.

With this arrangement, the short bend assembly 40 is disposed in the lower portion of the drive shaft assembly 30, and the short bend assembly 40 creates a bending point that tilts the power take-off assembly 50 and the drill bit at the lower end relative to the drive shaft assembly 30. The bend point-to-bit distance is directly reduced by the length of one drive shaft assembly 30 compared to the prior art, thereby greatly shortening the bend point-to-bit distance.

After the distance from the bending point to the drill bit is shortened, the sliding ratio can be greatly reduced in the process of directional drilling construction, and the build rate is improved, so that the drilling efficiency is improved.

According to the present invention, the short bend assembly 40 is disposed below the drive shaft assembly 30, so that the short bend assembly 40 needs to transmit torque while bearing drilling pressure during drilling operation, and the universal assembly used in the prior art cannot meet the use condition. In this embodiment, in order to make the short-bending assembly 40 normally transmit torque while bearing drilling pressure, the short-bending assembly 40 includes a bending shell 16 and a ball tooth connecting shaft 14 disposed in the bending shell 16, the bending shell 16 has a certain inclination angle, the inclination angle is set according to practical requirements, the ball tooth connecting shaft 14 is rotatably disposed in the bending shell 16, and two ends are respectively connected with the transmission shaft assembly 30 and the power output assembly 50 through ball teeth.

The transmission shaft assembly 30 comprises a power main shaft 1 and an outer shell 4 rotatably sleeved outside the main shaft 1. The upper end of the power spindle 1 is connected with a motor in a driving way, namely, torque can be transmitted to the power spindle 1 when the motor drives to rotate. The lower end of the power main shaft 1 is connected with the ball tooth connecting shaft 14, the power main shaft 1 can transmit torque to the ball tooth connecting shaft 14, and meanwhile, the power main shaft 1 and the ball tooth connecting shaft 14 can also be inclined at an angle. The lower end of the outer shell 4 is fixedly connected with the curved outer shell 16 through the middle joint 12.

The power take-off assembly 50 comprises an output spindle 18, the upper part of the output spindle 18 being connected to the curved housing 16 by a lower joint 17, wherein the curved housing 16 is fixedly connected to the lower joint 17, and the lower joint 17 is rotatably connected to the output spindle 18. The specific connection manner of the lower connector 17 and the output spindle 18 is not a technical gist of the present invention, and will not be described herein. The upper end of the output spindle 18 is connected to the ball tooth attachment shaft 14, and the ball tooth attachment shaft 14 is capable of transmitting torque to the output spindle 18, while the ball tooth attachment shaft 14 is capable of tilting relative to the output spindle 18.

Since the curved housing 16 has a certain inclination angle, the output shaft 18 is inclined with respect to the power shaft 1 by the same angle as the curved housing 16 after the power take-off assembly 50 and the propeller shaft assembly 30 are connected to the stub shaft assembly 40.

In a specific embodiment, as shown in fig. 2 and 5, upper buttons 22 are provided at the upper end of the button shaft 14 and lower buttons 25 are provided at the lower end of the button shaft 14. Correspondingly, the upper concave spherical teeth 21 are arranged at the lower end of the power main shaft 1 of the transmission shaft assembly 30, and the lower concave spherical teeth 26 are arranged at the upper end of the output main shaft 18 of the power output assembly 50. The upper convex buttons 22 of the button connecting shaft 14 are engaged with the upper concave buttons 21 of the power main shaft 1, so that the button connecting shaft 14 and the power main shaft 1 can transmit torque and can have a certain inclination angle. The lower convex buttons 25 of the button connecting shaft 14 are engaged with the lower concave buttons 26 of the output spindle 18, so that the button connecting shaft 14 and the output spindle 18 can transmit torque and can have a certain inclination angle.

According to the present invention, the overall structure of the upper lobe 22 is the same as that of the lower lobe 25, and the specific structure of the lower lobe 25 is described below, and the structure of the upper lobe 22 is not described again. As shown in fig. 3 and 4, the lower convex button 25 has a hemispherical overall shape, and correspondingly, the lower concave button 26 engaged therewith has an inwardly concave spherical shape. Specifically, the large diameter "SD outside" and the small diameter "SD outside" of the lower convex button 25 are equal to the large diameter and the small diameter of the lower concave button 26, respectively, and fit tolerances are set aside according to the mechanical design criteria.

The tooth shapes of the upper convex button 22 and the lower convex button 25 are generally involute tooth shapes, but are not limited to the tooth shapes, and as shown in fig. 6 to 11, the tooth shapes of the upper convex button 22 and the lower convex button 25 can be trapezoidal in cross section, on the basis of the trapezoid, the short sides of the trapezoid can be changed into inward concave arcs or outward convex arcs, and the intersection point of the short sides of the trapezoid and two waists can be rounded.

In a preferred embodiment, as shown in fig. 1 and 2, the outer diameter of both the upper and lower buttons 22, 25 is greater than the outer diameter of the button connecting shaft 14. An upper locking buckle 13 is arranged at the lower end of the power main shaft 1 of the transmission shaft assembly 30, wherein the upper convex spherical teeth 22 are positioned in the power main shaft 1 and are blocked by the upper locking buckle 13, so that the upper convex spherical teeth 22 of the spherical teeth connecting shaft 14 are prevented from being separated from the upper concave spherical teeth 22 of the power main shaft 1. Similarly, a lower locking buckle 15 is provided at the upper end of the output spindle 18 of the power output assembly 50, wherein the lower cam teeth 25 are located inside the output spindle 18 and are simultaneously blocked by the lower locking buckle 15, preventing the lower cam teeth 25 of the cam connecting shaft 14 from being disengaged from the lower cam teeth 26 of the output spindle 18.

As shown in fig. 2, the upper latch 13 and the lower latch 15 have the same overall shape, and the upper latch 13 will be described as an example. The upper locking buckle 13 is of an annular structure provided with a step hole, and the large diameter part of the upper locking buckle 13 is sleeved outside the lower end of the power main shaft 1 in a threaded connection mode. A gap exists between the small diameter part of the upper locking buckle 13 and the spherical tooth connecting shaft 14, namely the inner diameter of the small diameter part of the upper locking buckle 13 is larger than the outer diameter of the spherical tooth connecting shaft 14. When the ball tooth connecting shaft 14 is inclined relative to the power main shaft 1, the inner wall of the small diameter part of the upper locking buckle 13 can be in rigid contact with the outer wall of the ball tooth connecting shaft 14, and when the ball tooth connecting shaft and the outer wall are in rigid contact, the inclination angle of the ball tooth connecting shaft 14 relative to the power main shaft 1 reaches the maximum value.

The inclination angle of the ball tooth connecting shaft 14 relative to the power main shaft 1 can be adjusted by adjusting the difference between the small diameter of the upper locking buckle 13 and the outer diameter of the ball tooth connecting shaft 14.

It will be readily appreciated that the connection between the lower lock buckle 15 and the output spindle 18 and the button connecting shaft 14 is similar to the connection between the upper lock buckle 13 and the power spindle 1 and button connecting shaft 14, and will not be described in detail herein.

According to the present invention, in order to enable smooth installation of the button 14 with the upper and lower locking buckles 13 and 15, the button 14 includes a first shaft section 23 and a second shaft section 24. That is, the button connecting shaft 14 is divided into two parts from the middle, so that the upper locking buckle 13 and the lower locking buckle 15 can be arranged on the button connecting shaft 14 in a penetrating way between the first shaft section 23 and the second shaft section 24. After the upper and lower locking buckles 13 and 15 are mounted on the button connecting shaft 14, the first and second shaft sections 23 and 24 are fixed by welding or screwing, so long as the first shaft section 23 is ensured to transmit torque to the second shaft section 24.

In a specific embodiment, the length of the power spindle 1 of the transmission shaft assembly 30 is greater than the length of the outer housing 4, and after the outer housing 4 is connected to the curved outer housing 16 of the short-curve assembly 40 through the middle joint 12, the lower end of the middle joint 12 is still located above the lower end surface of the power spindle 1, so as to provide a space for the upper locking buckle 13 to connect with the power spindle 1.

The power main shaft 1 and the outer shell 4 are connected in a bearing connection mode. In the present embodiment, a step is provided at the upper end portion of the outer case 4, that is, the upper end portion of the outer case 4 has an inner diameter smaller than that of the other lower portion. The bearing 7 is a TC bearing string, and is provided at a large diameter of the outer case 4.

The lower end of the outer shell 4 is sleeved outside the middle joint 12, i.e. the middle joint 12 extends to the inside of the outer shell 4. The lower end of the bearing 7 is provided with a static ring jacking sleeve 8 and a movable ring jacking sleeve 9, and the static ring jacking sleeve 8 is sleeved outside the movable ring jacking sleeve 9. The upper and lower ends of the static ring jacking sleeve 8 are respectively abutted with the outer ring of the bearing 7 and the middle joint 12. The upper and lower ends of the moving coil jacking sleeve 9 are respectively abutted with the inner ring of the bearing 7 and the power main shaft 1, specifically, a stepped shaft is arranged on the power main shaft 1, so that the moving coil jacking sleeve 9 is abutted.

In addition, a lower anti-abrasion static ring 10 is arranged between the lower end of the static ring jacking sleeve 8 and the middle joint 12. A lower anti-abrasion moving coil 11 is arranged between the lower end of the moving coil jacking sleeve 9 and the power main shaft 1.

An upper anti-wear static ring 5 and an upper anti-wear moving ring 6 which are sleeved in sequence from outside to inside are arranged between the small diameter part of the outer shell 4 and the power main shaft 1. A tightening nut 3 and an adjusting pad 2 are arranged on the power main shaft 1 above the outer shell 4. The upper end and the lower end of the upper anti-abrasion static ring 5 are respectively abutted with the outer rings of the jacking nut 3 and the bearing 7, and the upper end and the lower end of the upper anti-abrasion moving ring 6 are respectively abutted with the inner rings of the jacking nut 3 and the bearing 7. With this arrangement, the axial tightness of the bearing 7 can be adjusted by rotating the jack nut 3.

In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a short curved transmission shaft, its characterized in that includes transmission shaft assembly, short curved assembly and power take off assembly, short curved assembly sets up the transmission shaft assembly with the power take off assembly, the short curved assembly is constructed so that transmission shaft assembly with the power take off assembly is mutual slope, and will the moment of torsion of transmission shaft assembly is transmitted to the power take off assembly.

2. The stub shaft of claim 1, wherein the stub assembly includes a curved housing (16) and a button connecting shaft (14) disposed within the curved housing (16), buttons being disposed at both ends of the button connecting shaft (14), and concave buttons being disposed at both ends of the drive shaft assembly and the power take-off assembly for mating with the buttons of the button connecting shaft (14).

3. A stub shaft as claimed in claim 2 wherein the buttons are hemispherical with through holes provided at the central axes of the button connection shaft (14) and buttons.

4. A stub shaft as claimed in claim 3 wherein the external diameter of the buttons is greater than the external diameter of the button connecting shaft (14), an upper locking buckle (13) for placing the buttons out of engagement is provided at the end of the drive shaft assembly connected to the buttons, and a lower locking buckle (15) for placing the buttons out of engagement is provided at the end of the power take-off assembly connected to the buttons.

5. The stub shaft of claim 4, wherein the upper lock catch (13) and the lower lock catch (15) are capable of rigidly contacting the ball tooth connecting shaft (14) when the ball tooth connecting shaft (14) is tilted relative to the drive shaft assembly and the power take-off assembly, thereby limiting the angle of tilt of the ball tooth connecting shaft (14).

6. The short-bent transmission shaft according to claim 5, characterized in that the upper locking buckle (13) and the lower locking buckle (15) are of annular structures provided with stepped holes, the major diameters of the upper locking buckle (13) and the lower locking buckle (15) are respectively connected with the transmission shaft assembly and the power output assembly, and the minor diameters of the upper locking buckle (13) and the lower locking buckle (15) are used for being in rigid contact with the spherical tooth connecting shaft (14).

7. The stub shaft of claim 4, wherein the button connecting shaft (14) comprises a first shaft section and a second shaft section, the first shaft section and the second shaft section being fixedly connected after the upper locking clasp (13) and the lower locking clasp (15) are disposed on the button connecting shaft (14).

8. The stub shaft of any one of claims 2-7, wherein the drive shaft assembly comprises: the power main shaft (1) and the outer shell (4) arranged outside the power main shaft (1) through a bearing, wherein the outer shell (4) is connected with the curved shell (16) through a middle joint (12), and concave buttons used for being connected with convex buttons at the upper end of the button connecting shaft (14) are arranged at the lower end of the power main shaft (1).

9. The stub shaft of claim 8, wherein wear rings are provided at both ends of the bearing.

10. A stub shaft as claimed in any one of claims 2 to 7 wherein the power take-off assembly comprises an output spindle (18), the upper end of the output spindle (18) being provided with female buttons for connection with male buttons at the lower end of the button connection shaft (14).