Screw drill transmission shaft assembly and screw drill

Abstract

The invention relates to a screw drill transmission shaft assembly and a screw drill, and belongs to the technical field of petroleum and natural gas drilling equipment. The transmission shaft assembly of the screw drill comprises a transmission shaft assembly and a thrust bearing assembly, wherein the transmission shaft assembly comprises a transmission shaft shell and a transmission shaft body arranged in the transmission shaft shell; the thrust bearing assembly is connected between the transmission shaft shell and the transmission shaft body so as to transmit the axial force of the transmission shaft body to the transmission shaft shell. Due to the fact that the thrust bearing assembly is arranged, the axial load can be borne, even if the drilling pressure of the stratum on the drill bit is very small or does not exist, the abrasion speed of the string bearing cannot be increased, abrasion of the string bearing can be effectively avoided, and then the influence on the service life of the screw drill is avoided. According to the improved screw drill transmission shaft assembly, by additionally arranging the thrust bearing assembly, load distribution can be optimized, the bearing capacity of the transmission shaft assembly is remarkably improved, and the service life of the transmission shaft assembly is remarkably prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas drilling equipment, and in particular to a screw drill transmission shaft assembly and a screw drill. Background Art

[0002] In the process of oil and gas extraction, screw drill tools are used more and more widely. Screw drill tools mainly include motor assembly, universal shaft housing, universal shaft assembly and transmission shaft assembly, among which the transmission shaft assembly is the power output end, driving the drill bit to crush rocks. The transmission shaft assembly is an extremely critical component in screw drill tools, and its structure and performance are directly related to the drilling efficiency and service life of screw drill tools. At present, the transmission shaft assembly mainly uses string bearings to carry axial loads. The transmission shaft assembly basically includes a transmission shaft, a lower radial bearing, a transmission shaft housing, a spacer sleeve, a half ring, a retaining sleeve, a string bearing, an upper radial bearing and a water cap. The string bearing can carry axial force, and the lower radial bearing and the upper radial bearing can carry radial force, so that the transmission shaft assembly has the ability to carry complex loads.

[0003] During the use of the screw drill connected to the drill bit at the bottom of the well, under normal working conditions, the screw drill string bearing will bear forces in two directions. One is the downward force, which is the weight of the rotor, universal shaft assembly, transmission shaft and drill bit and the mud thrust under the pumping condition; the other is the upward force, which is the force caused by the reverse drilling pressure of the formation on the drill bit. The ideal situation is that the upward force and the downward force are basically offset, at which time the force of the string bearing is the best and the wear is slow.

[0004] However, when the drill bit is reamed for a long time or under the condition of very low drilling pressure, the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure, and the downward force on the string bearing is much greater than the upward force. The force on the string bearing is in the worst state. In this case, the string bearing wears very quickly, which can easily cause the upper part of the string bearing to fail, affecting the service life of the screw drill. Summary of the invention

[0005] The embodiment of the present application provides a screw drill transmission shaft assembly and a screw drill to solve the problem in the related art that when the drill bit is subjected to long-term eye-reaming or the drilling pressure is very low, the stress state of the string bearing in the screw drill for bearing the axial load is poor, which easily leads to accelerated wear of the string bearing and thus affects the service life of the screw drill.

[0006] In a first aspect, an embodiment of the present application provides a screw drill transmission shaft assembly, comprising:

[0007] A transmission shaft assembly, the transmission shaft assembly comprising a transmission shaft housing and a transmission shaft body disposed in the transmission shaft housing;

[0008] A thrust bearing assembly is connected between the transmission shaft housing and the transmission shaft body to transmit the axial force of the transmission shaft body to the transmission shaft housing.

[0009] In some embodiments, the thrust bearing assembly includes a dynamic ring sleeved on the transmission shaft body and a static ring sleeved on the dynamic ring, and the static ring is fixed to the transmission shaft housing.

[0010] In some embodiments, the inner wall of the transmission shaft housing is provided with a stage for installing and fixing the stationary ring.

[0011] In some embodiments, it also includes an upper radial bearing and a lower radial bearing arranged from high to low along the height direction;

[0012] The upper radial bearing comprises an upper TC movable sleeve sleeved on the transmission shaft body and an upper TC stationary sleeve sleeved on the upper TC movable sleeve;

[0013] The lower radial bearing comprises a lower TC moving sleeve sleeved on the transmission shaft body and a lower TC stationary sleeve sleeved on the lower TC moving sleeve.

[0014] In some embodiments, a string bearing is further included, wherein the string bearing is disposed between the upper radial bearing and the lower radial bearing, and the thrust bearing assembly is disposed on the top of the string bearing.

[0015] In some embodiments, a half ring is further included, which is arranged at one end of the string bearing away from the upper radial bearing, the half ring is installed in a groove opened on the transmission shaft body, and a spline is installed on the outer circle of the half ring.

[0016] In some embodiments, a stopper sleeve is mounted on the half ring, and a keyway in an inner hole of the stopper sleeve is engaged with the spline.

[0017] In some embodiments, a spacer is provided on the outer circumference of the stop sleeve.

[0018] In some embodiments, a clearance adjustment sleeve is disposed on the top of the upper radial bearing, and the clearance adjustment sleeve is sleeved on the transmission shaft body.

[0019] In a second aspect, an embodiment of the present application provides a screw drill, including the above-mentioned screw drill drive shaft assembly.

[0020] The beneficial effects of the technical solution provided by this application include:

[0021] An embodiment of the present application provides a screw drill drive shaft assembly and a screw drill, wherein the screw drill drive shaft assembly includes a drive shaft assembly and a thrust bearing assembly, wherein the drive shaft assembly includes a drive shaft housing and a drive shaft body disposed in the drive shaft housing; the thrust bearing assembly is connected between the drive shaft housing and the drive shaft body to transmit the axial force of the drive shaft body to the drive shaft housing.

[0022] In actual use, the transmission shaft assembly is mainly composed of a transmission shaft housing and a transmission shaft body. The transmission shaft body is arranged in the transmission shaft housing. As the core component of power transmission, a thrust bearing assembly is connected between the transmission shaft housing and the transmission shaft body. The setting of the thrust bearing assembly can transmit the axial force of the transmission shaft body to the transmission shaft housing. In use, the transmission shaft assembly usually uses a string bearing to bear the axial load. However, when the drill bit is reamed for a long time or under the condition of very low drilling pressure, the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure. At this time, the downward force on the string bearing is much greater than the upward force, and the force on the string bearing is in the worst state. In this case, the wear rate of the string bearing is very fast, which can easily cause the failure of the upper half of the string bearing, affecting the service life of the screw drill. Since the thrust bearing assembly is provided, it can bear the axial load. In this way, the thrust bearing assembly can help the string bearing bear part of the axial load. Even if the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure, the string bearing will not wear faster because the downward force is much greater than the upward force. The wear of the string bearing can be effectively avoided, thereby avoiding affecting the service life of the screw drill. The improved screw drill drive shaft assembly of the present application can optimize load distribution and significantly improve the load-bearing capacity and service life of the drive shaft assembly by adding a thrust bearing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the overall structure of the transmission shaft assembly provided in an embodiment of the present application;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the thrust bearing assembly and other components.

[0026] Reference numerals:

[0027] 1. Transmission shaft body; 2. Lower TC moving sleeve; 3. Lower TC static sleeve; 4. Transmission shaft housing; 5. Spacer; 6. Half ring; 7. Spline; 8. Stopper sleeve; 9. String bearing; 10. Upper TC static sleeve; 11. Upper TC moving sleeve; 12. Clearance adjustment sleeve; 13. Static ring; 14. Moving ring; 15. Housing adjustment sleeve; 16. Water cap; 17. Universal shaft housing. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The embodiment of the present application provides a screw drill transmission shaft assembly and a screw drill, which can solve the problem in the related art that when the drill bit is subjected to long-term eye-reaming or when the drilling pressure is very low, the stress state of the string bearing in the screw drill for bearing the axial load is poor, which can easily lead to accelerated wear of the string bearing, thereby affecting the service life of the screw drill.

[0030] See also Figure 1 and Figure 2 As shown, on the one hand, an embodiment of the present application provides a screw drill drive shaft assembly, including a drive shaft assembly and a thrust bearing assembly, the drive shaft assembly including a drive shaft housing 4 and a drive shaft body 1 arranged in the drive shaft housing 4; the thrust bearing assembly is connected between the drive shaft housing 4 and the drive shaft body 1 to transmit the axial force of the drive shaft body 1 to the drive shaft housing 4.

[0031] In actual use, the transmission shaft assembly is mainly composed of a transmission shaft housing 4 and a transmission shaft body 1. The transmission shaft body 1 is arranged in the transmission shaft housing 4. As the core component of power transmission, a thrust bearing assembly is connected between the transmission shaft housing 4 and the transmission shaft body 1. The setting of the thrust bearing assembly can transmit the axial force of the transmission shaft body 1 to the transmission shaft housing 4. In use, the transmission shaft assembly usually uses a string bearing 9 to bear the axial load. However, when the drill bit is reamed for a long time or under the condition of very low drilling pressure, the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure. At this time, the downward force on the string bearing 9 is much greater than the upward force, and the force on the string bearing 9 is at its lowest. In such a bad condition, the wear rate of the string bearing 9 is very fast, which can easily cause the failure of the upper part of the string bearing 9 and affect the service life of the screw drill. However, since the thrust bearing assembly is provided, it can bear the axial load. In this way, the thrust bearing assembly can help the string bearing 9 to bear part of the axial load. Even if the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure, the string bearing 9 will not wear faster because the downward force is much greater than the upward force. The wear of the string bearing 9 can be effectively avoided, thereby avoiding affecting the service life of the screw drill. The improved screw drill transmission shaft assembly of the present application can optimize the load distribution by adding a thrust bearing assembly, and significantly improve the load-bearing capacity and service life of the transmission shaft assembly.

[0032] In some optional embodiments, such as Figure 2 As shown, the thrust bearing assembly includes a dynamic ring 14 sleeved on the transmission shaft body 1 and a static ring 13 sleeved on the dynamic ring 14, and the static ring 13 is fixed to the transmission shaft housing 4. The thrust bearing assembly includes a dynamic ring 14 sleeved on the transmission shaft body 1 and a static ring 13 sleeved on the dynamic ring 14. The static ring 13 is fixed on the transmission shaft housing 4, and the effective transmission and dispersion of the axial force is achieved through the relative movement of the dynamic ring 14 and the static ring 13.

[0033] In some optional embodiments, the inner wall of the transmission shaft housing 4 is provided with a step for installing and fixing the stationary ring 13. The inner wall of the transmission shaft housing 4 is provided with a step for installing and fixing the stationary ring 13 to ensure the stability and reliability of the thrust bearing assembly.

[0034] In some optional embodiments, such as Figure 1 and Figure 2As shown, it also includes an upper radial bearing and a lower radial bearing arranged from high to low in the height direction; the upper radial bearing includes an upper TC moving sleeve 11 sleeved on the transmission shaft body 1 and an upper TC static sleeve 10 sleeved on the upper TC moving sleeve 11; the lower radial bearing includes a lower TC moving sleeve 2 sleeved on the transmission shaft body 1 and a lower TC static sleeve 3 sleeved on the lower TC moving sleeve 2. The upper radial bearing includes an upper TC moving sleeve 11 and an upper TC static sleeve 10, which are sleeved on the upper part of the transmission shaft body 1 and are mainly used to bear radial forces. The lower radial bearing includes a lower TC moving sleeve 2 and a lower TC static sleeve 3, which are also sleeved on the lower part of the transmission shaft body 1 and work in conjunction with the upper radial bearing to ensure the stable operation of the transmission shaft assembly.

[0035] In some optional embodiments, a clearance adjustment sleeve 12 is provided on the top of the upper radial bearing, and the clearance adjustment sleeve 12 is sleeved on the transmission shaft body 1. The clearance adjustment sleeve 12 is provided on the top of the upper radial bearing for fine-tuning the bearing clearance to meet the operating requirements under different working conditions.

[0036] In some optional embodiments, such as Figure 1 and Figure 2 As shown, it also includes a string bearing 9, which is arranged between the upper radial bearing and the lower radial bearing, and a thrust bearing assembly is arranged on the top of the string bearing 9. The string bearing 9 is arranged between the upper radial bearing and the lower radial bearing, mainly bears the axial load, and assists in transmitting the torque. In actual use, the thrust bearing assembly is arranged on the top of the string bearing 9, and preferentially bears and disperses the axial force transmitted by the transmission shaft body 1, thereby reducing the load burden of the string bearing 9. In use, the transmission shaft assembly usually uses a string bearing 9 to bear the axial load. However, when the drill bit is reamed for a long time or under conditions of very low drilling pressure, the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure. At this time, the downward force on the string bearing 9 is much greater than the upward force, and the force on the string bearing 9 is in the worst state. In this case, the string bearing 9 wears very quickly, which can easily cause the upper part of the string bearing 9 to fail, affecting the service life of the screw drill. Since the thrust bearing assembly is provided, it can bear the axial load. In this way, the thrust bearing assembly can help the string bearing 9 bear part of the axial load, and the thrust bearing assembly is provided at the top of the string bearing 9, giving priority to bearing and dispersing the axial force transmitted by the transmission shaft body 1. Even if the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure, the string bearing 9 will not wear faster because the downward force is much greater than the upward force. The wear of the string bearing 9 can be effectively avoided, thereby avoiding affecting the service life of the screw drill. The improved screw drill drive shaft assembly of the present application can optimize load distribution and significantly improve the load-bearing capacity and service life of the drive shaft assembly by adding a thrust bearing assembly.

[0037] A housing adjustment sleeve 15 is provided in the transmission shaft housing 4 and is located around the transmission shaft body 1 for adjusting the gap between the transmission shaft body 1 and the transmission shaft housing 4 to ensure stable operation and precise axial positioning of the transmission shaft assembly.

[0038] In some optional embodiments, such as Figure 1 and Figure 2 As shown, it also includes a half ring 6, which is arranged at one end of the string bearing 9 away from the upper radial bearing. The half ring 6 is installed in a groove opened on the transmission shaft body 1, and a spline 7 is installed on the outer circle of the half ring 6. In some actual use situations, a stopper sleeve 8 is mounted on the half ring 6, and the keyway of the inner hole of the stopper sleeve 8 is embedded in the spline 7. In actual use, a spacer sleeve 5 is provided on the outer circle of the stopper sleeve 8. The half ring 6 is installed in the groove of the transmission shaft body 1 and is connected to the stopper sleeve 8 through the spline 7 to enhance the structural strength and stability of the transmission shaft assembly. The spacer sleeve 5 is provided on the outer circle of the stopper sleeve 8 to further optimize the matching relationship between the components and reduce wear. The design of the half ring 6, the stopper sleeve 8 and the spacer sleeve 5 enhances the structural strength of the transmission shaft assembly and improves the overall stability and reliability.

[0039] In summary, the screw drill transmission shaft assembly of the present application includes a transmission shaft assembly and a thrust bearing assembly. The transmission shaft assembly includes a transmission shaft housing 4 and a transmission shaft body 1 arranged in the transmission shaft housing 4; the thrust bearing assembly is connected between the transmission shaft housing 4 and the transmission shaft body 1 to transmit the axial force of the transmission shaft body 1 to the transmission shaft housing 4.

[0040] In actual use, the transmission shaft assembly is mainly composed of a transmission shaft housing 4 and a transmission shaft body 1. The transmission shaft body 1 is arranged in the transmission shaft housing 4. As the core component of power transmission, a thrust bearing assembly is connected between the transmission shaft housing 4 and the transmission shaft body 1. The setting of the thrust bearing assembly can transmit the axial force of the transmission shaft body 1 to the transmission shaft housing 4. In use, the transmission shaft assembly usually uses a string bearing 9 to bear the axial load. However, when the drill bit is reamed for a long time or under the condition of very low drilling pressure, the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure. At this time, the downward force on the string bearing 9 is much greater than the upward force, and the force on the string bearing 9 is at its lowest. In such a bad condition, the wear rate of the string bearing 9 is very fast, which can easily cause the failure of the upper part of the string bearing 9 and affect the service life of the screw drill. However, since the thrust bearing assembly is provided, it can bear the axial load. In this way, the thrust bearing assembly can help the string bearing 9 to bear part of the axial load. Even if the drilling pressure of the formation on the drill bit is very small or there is no drilling pressure, the string bearing 9 will not wear faster because the downward force is much greater than the upward force. The wear of the string bearing 9 can be effectively avoided, thereby avoiding affecting the service life of the screw drill. The improved screw drill transmission shaft assembly of the present application can optimize the load distribution by adding a thrust bearing assembly, and significantly improve the load-bearing capacity and service life of the transmission shaft assembly.

[0041] The present application significantly improves the load-bearing capacity of the transmission shaft assembly by adding a thrust bearing assembly to effectively disperse and transmit the axial force. Under extreme working conditions, the thrust bearing assembly takes the axial force first, reduces the wear of the string bearing 9, and thus extends the service life of the entire transmission shaft assembly. The reasonable configuration of the upper radial bearing, the lower radial bearing and the string bearing 9, as well as the application of the clearance adjustment sleeve 12, ensures the stable operation of the transmission shaft assembly and the ability to adapt to different working conditions.

[0042] See also Figure 1 and Figure 2As shown, another aspect of the present application embodiment provides a screw drill, including the above-mentioned screw drill transmission shaft assembly. The screw drill also includes a water cap 16, which is connected between the universal shaft and the transmission shaft body 1; a universal shaft housing 17 is arranged outside the universal shaft. In actual use, the universal shaft, as an important part of the screw drill, is responsible for transmitting the power generated by the motor to the transmission shaft assembly. A universal shaft housing 17 is arranged outside the universal shaft to protect the universal shaft and guide its movement. The present application provides a water cap 16 between the universal shaft and the transmission shaft body 1. The water cap 16 can guide the drilling fluid (mud) to flow to the drill bit and the transmission shaft assembly to provide good cooling and lubrication effects. By optimizing the design of the water cap 16, it is possible to ensure that the drilling fluid is evenly distributed, reduce component wear, and improve drilling efficiency. In the present application, the design of the universal shaft and the universal shaft housing 17 maintains the basic requirements of traditional screw drills, while ensuring good coordination with components such as the transmission shaft assembly and the water cap 16.

[0043] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0044] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0045] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A screw drill transmission shaft assembly, characterized in that: include: A transmission shaft assembly, the transmission shaft assembly comprising a transmission shaft housing (4) and a transmission shaft body (1) arranged in the transmission shaft housing (4); A thrust bearing assembly is connected between the transmission shaft housing (4) and the transmission shaft body (1) to transmit the axial force of the transmission shaft body (1) to the transmission shaft housing (4).

2. A screw drill transmission shaft assembly as claimed in claim 1, characterized in that: The thrust bearing assembly comprises a dynamic ring (14) sleeved on the transmission shaft body (1) and a static ring (13) sleeved on the dynamic ring (14); the static ring (13) is fixed to the transmission shaft housing (4).

3. A screw drill transmission shaft assembly as claimed in claim 2, characterized in that: The inner wall of the transmission shaft housing (4) is provided with a stage for installing and fixing the stationary ring (13).

4. A screw drill transmission shaft assembly as claimed in claim 2, characterized in that: It also includes an upper radial bearing and a lower radial bearing arranged from high to low along the height direction; The upper radial bearing comprises an upper TC moving sleeve (11) sleeved on the transmission shaft body (1) and an upper TC stationary sleeve (10) sleeved on the upper TC moving sleeve (11); The lower radial bearing comprises a lower TC moving sleeve (2) sleeved on the transmission shaft body (1) and a lower TC stationary sleeve (3) sleeved on the lower TC moving sleeve (2).

5. A screw drill transmission shaft assembly as claimed in claim 4, characterized in that: It also comprises a string bearing (9), wherein the string bearing (9) is arranged between the upper radial bearing and the lower radial bearing, and the thrust bearing assembly is arranged on the top of the string bearing (9).

6. A screw drill transmission shaft assembly as claimed in claim 5, characterized in that: It also includes a half ring (6), which is arranged at one end of the string bearing (9) away from the upper radial bearing, and the half ring (6) is installed in a groove opened on the transmission shaft body (1), and a spline (7) is installed on the outer circle of the half ring (6).

7. A screw drill transmission shaft assembly as claimed in claim 6, characterized in that: The half ring (6) is sleeved with a stopper sleeve (8), and the keyway of the inner hole of the stopper sleeve (8) is engaged with the spline (7).

8. A screw drill transmission shaft assembly as claimed in claim 7, characterized in that: A spacer sleeve (5) is arranged at the outer circumference of the stop sleeve (8).

9. The screw drill transmission shaft assembly according to claim 4, characterized in that: A clearance adjustment sleeve (12) is provided on the top of the upper radial bearing, and the clearance adjustment sleeve (12) is sleeved on the transmission shaft body (1).

10. A screw drill, characterized in that: The invention comprises the screw drill tool transmission shaft assembly as described in any one of claims 1 to 9.

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