Anti-self-locking screw drill for coiled tubing

Abstract

The utility model provides a screw drill for an anti-self-locking coiled tubing, and relates to the technical field of tubing drills. An anti-self-locking screw drill for coiled tubing comprises an anti-locking assembly, a screw motor assembly, a flexible shaft assembly and a transmission assembly. The anti-locking assembly comprises an anti-locking short section, a static valve alloy block, a movable valve, a movable valve seat, an anti-falling shell and a movable hinge universal shaft. The screw motor assembly comprises a screw rubber stator and a screw motor rotor located in the screw rubber stator. The flexible shaft assembly comprises a flexible shaft shell and a flexible shaft located in the flexible shaft shell. The transmission assembly comprises a TC bearing shell, a transmission shaft shell and a transmission shaft. By the adoption of the coiled tubing anti-locking device, the size of the overflowing area of the alloy blocks of the movable valve and the static valve can be changed, periodic hydraulic impact force changes can be generated, axial pulling force is generated, the anti-locking short section generates 10-15 HZ vibration, friction resistance between the coiled tubing and the well wall is reduced, and therefore the effect of preventing the coiled tubing from being locked is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pipe drilling tools, in particular to a screw drilling tool for an anti-self-locking continuous oil pipe. Background Art

[0002] Since curved wells or extended reach wells have the characteristics of large inclination angle, long horizontal displacement and long open hole stable inclination section, when running the coiled tubing in such wells, it needs to bear the effects of multiple external loads such as its own weight, the pressure of internal and external liquids, the friction resistance between the coiled tubing and the well wall, the viscous resistance of the liquid and the well wall support reaction force. The initial form of the coiled tubing may be a straight line, but with the increase of axial pressure, the coiled tubing may cause unstable bending. Theoretical studies have shown that the coiled tubing will first appear sinusoidal buckling, and then spiral buckling. The positive pressure between the coiled tubing and the well wall also increases, thereby increasing the friction resistance. When the axial pressure continues to increase, self-locking may occur, and the coiled tubing cannot continue to move forward. In order to solve the problem of self-locking of the coiled tubing in the well, a hydraulic oscillator is generally installed on the well entry pipe string. The periodic change of the flow area of ​​the pumped liquid in the tool is used to generate a periodic vibration load on the pipe string, causing the pipe string to vibrate axially, thereby reducing the friction between the coiled tubing body and the well wall and increasing the advancement distance of the horizontal section.

[0003] Although the hydraulic oscillator is a relatively effective tool for reducing friction and drag, the pressure reduction of this type of tool is relatively high. In addition, the installation position of this type of tool is limited, so this type of tool cannot reduce the friction resistance near the drill bit. Utility Model Content

[0004] The purpose of the utility model is to provide a screw drill for an anti-self-locking coiled tubing, which can propose a solution to the deficiencies of the prior art. The utility model can change the flow area of ​​the dynamic valve and the static valve alloy block to produce periodic hydraulic impact force changes, generate axial pulling force, and make the anti-locking short section produce 10-15HZ vibration, reduce the friction between the coiled tubing and the well wall, thereby preventing the coiled tubing from being locked.

[0005] The technical solution adopted by the utility model is:

[0006] The embodiment of the present application provides a screw drill for anti-self-locking coiled tubing, comprising an anti-locking assembly, a screw motor assembly, a flexure shaft assembly and a transmission assembly;

[0007] The anti-lock assembly includes an anti-lock nipple, a static valve alloy block, a moving valve, a moving valve seat, an anti-drop housing, and a live hinge universal shaft. One end of the anti-lock nipple is provided with a static valve alloy block and embedded in the anti-drop housing; the moving valve seat is provided in the anti-drop housing, and the moving valve is provided at one end of the moving valve seat close to the static valve alloy block;

[0008] The screw motor assembly includes a screw rubber stator and a screw motor rotor located inside the screw rubber stator, one end of the screw rubber stator is connected to the anti-drop housing; one end of the live hinge universal shaft is connected to the moving valve seat, and the other end of the live hinge universal shaft is embedded in the screw rubber stator and connected to one end of the screw motor rotor;

[0009] The flex shaft assembly includes a flex shaft housing and a flex shaft located inside the flex shaft housing, one end of the flex shaft housing is connected to the screw rubber stator, and one end of the flex shaft is connected to the end of the screw motor rotor away from the live hinge universal shaft;

[0010] The transmission assembly includes a TC bearing housing, a transmission shaft housing, and a transmission shaft. One end of the TC bearing housing is connected to the flexible shaft housing, and the other end of the TC bearing housing is connected to the transmission shaft housing; one end of the flexible shaft away from the screw motor rotor passes through the TC bearing housing and is embedded in the transmission shaft housing; one end of the transmission shaft is embedded in the transmission shaft housing and connected to the flexible shaft.

[0011] Furthermore, in some embodiments of the present invention, the anti-locking assembly also includes a pressure cover, which is sleeved on the outer wall of one end of the anti-locking short section close to the static valve alloy block, and the pressure cover is threadedly connected to the anti-locking short section.

[0012] Furthermore, in some embodiments of the utility model, the anti-lock assembly also includes an anti-drop disk, the anti-drop disk and the movable valve are both arranged on the outer side wall of the movable valve seat, the movable valve is located between the anti-drop disk and the static valve alloy block, and the movable valve is threadedly connected to the movable valve seat.

[0013] Furthermore, in some embodiments of the present invention, the anti-locking short section is sleeved on the outer side wall of the static valve alloy block, and the static valve alloy block and the anti-locking short section are interference fit.

[0014] Furthermore, in some embodiments of the present invention, the transmission assembly also includes a spacer sleeve and a pressure-bearing sleeve, the pressure-bearing sleeve is arranged outside the transmission shaft, the spacer sleeve is arranged outside the pressure-bearing sleeve, and the transmission shaft housing is arranged outside the spacer sleeve.

[0015] Furthermore, in some embodiments of the present invention, the transmission assembly also includes a bearing string, and the bearing string is sleeved between the transmission shaft housing and the transmission shaft.

[0016] Furthermore, in some embodiments of the present invention, the anti-locking short section and the screw rubber stator are both threadedly connected to the anti-drop housing, the screw rubber stator and the TC bearing housing are both threadedly connected to the flexible shaft housing, and the transmission shaft housing is threadedly connected to the TC bearing housing.

[0017] Furthermore, in some embodiments of the present invention, the movable valve seat and the screw motor rotor are both threadedly connected to the living joint universal shaft.

[0018] Furthermore, in some embodiments of the present invention, the screw motor rotor and the transmission shaft are both threadedly connected to the flexible shaft.

[0019] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0020] The embodiment of the utility model provides a screw drill for an anti-self-locking coiled tubing, which can change the flow area size of the dynamic valve and the static valve alloy block to produce periodic hydraulic impact force changes, generate axial pulling force, and make the anti-locking short section produce 10-15HZ vibration, reduce the friction between the coiled tubing and the well wall, thereby preventing the coiled tubing from locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A partial cross-sectional view of a screw drill for an anti-self-locking coiled tubing provided in an embodiment of the utility model;

[0023] Figure 2 for Figure 1 Sectional view of section A;

[0024] Figure 3 for Figure 1 Cross-sectional view of the middle section B;

[0025] Figure 4 for Figure 1 Cross-sectional view of the middle C segment;

[0026] Figure 5 for Figure 1 Cross-sectional view of the middle D segment;

[0027] Figure 6 for Figure 1 Cross-sectional view of section E.

[0028] Icons: 1-anti-locking short section; 2-pressure cover; 3-static valve alloy block; 4-moving valve; 5-anti-dropping disc; 6-moving valve seat; 7-anti-dropping housing; 8-living hinge universal shaft; 9-screw rubber stator; 10-screw motor rotor; 11-flexible shaft; 12-flexible shaft housing; 13-TC bearing housing; 14-drive shaft housing; 15-spacer sleeve; 16-pressure sleeve; 17-bearing string; 18-drive shaft. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the embodiments of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply 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 utility model. In addition, if the terms "first", "second", etc. appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] In addition, the use of terms such as "horizontal" and "vertical" does not mean that the components must be absolutely horizontal or vertical, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Example

[0036] Please refer to Figure 1-Figure 6 , this embodiment provides a screw drill for anti-self-locking coiled tubing, including an anti-locking assembly, a screw motor assembly, a flexure shaft assembly and a transmission assembly;

[0037] The anti-lock assembly includes an anti-lock nipple 1, a static valve alloy block 3, a dynamic valve 4, a dynamic valve seat 6, an anti-drop housing 7, and a live hinge universal shaft 8. One end of the anti-lock nipple 1 is provided with a static valve alloy block 3 and embedded in the anti-drop housing 7; the dynamic valve seat 6 is provided in the anti-drop housing 7, and the dynamic valve 4 is provided at one end of the dynamic valve seat 6 close to the static valve alloy block 3;

[0038] The screw motor assembly includes a screw rubber stator 9 and a screw motor rotor 10 located inside the screw rubber stator 9, one end of the screw rubber stator 9 is connected to the anti-drop housing 7; one end of the live hinge universal shaft 8 is connected to the moving valve seat 6, and the other end of the live hinge universal shaft 8 is embedded in the screw rubber stator 9 and connected to one end of the screw motor rotor 10;

[0039] The flexible shaft assembly includes a flexible shaft housing 12 and a flexible shaft 11 located inside the flexible shaft housing 12. One end of the flexible shaft housing 12 is connected to the screw rubber stator 9, and one end of the flexible shaft 11 is connected to the end of the screw motor rotor 10 away from the living joint universal shaft 8. The flexible shaft assembly converts the planetary motion of the screw motor rotor 10 into the fixed axis motion of the transmission shaft 18.

[0040] The transmission assembly includes a TC bearing housing 13, a transmission shaft housing 14, and a transmission shaft 18. One end of the TC bearing housing 13 is connected to the flexible shaft housing 12, and the other end of the TC bearing housing 13 is connected to the transmission shaft housing 14; one end of the flexible shaft 11 away from the screw motor rotor 10 passes through the TC bearing housing 13 and is embedded in the transmission shaft housing 14; one end of the transmission shaft 18 is embedded in the transmission shaft housing 14 and is connected to the flexible shaft 11.

[0041] The anti-locking assembly of this embodiment also includes a gland 2 and an anti-dropping disc 5. The gland 2 is sleeved on the outer side wall of one end of the anti-locking short section 1 close to the static valve alloy block 3, and the gland 2 is threadedly connected to the anti-locking short section 1. The anti-dropping disc 5 and the movable valve 4 are both arranged on the outer side wall of the movable valve seat 6. The movable valve 4 is located between the anti-dropping disc 5 and the static valve alloy block 3. The movable valve 4 is threadedly connected to the movable valve seat 6, and the anti-dropping disc 5 is installed on the movable valve seat 6 through a hexagon.

[0042] The anti-locking nipple 1 of this embodiment is sleeved on the outer wall of the static valve alloy block 3, and the static valve alloy block 3 is interference fit with the anti-locking nipple 1. The transmission assembly of this embodiment also includes a spacer 15 and a pressure sleeve 16, the pressure sleeve 16 is sleeved on the outside of the transmission shaft 18, the spacer 15 is sleeved on the outside of the pressure sleeve 16, and the transmission shaft housing 14 is sleeved on the outside of the spacer 15. The transmission assembly also includes a bearing string 17, and the bearing string 17 is sleeved between the transmission shaft housing 14 and the transmission shaft 18. The spacer 15 and the pressure sleeve 16 mainly adjust the inner and outer ring clearance of the bearing string 17.

[0043] In this embodiment, the anti-locking nipple 1 and the screw rubber stator 9 are both threadedly connected to the anti-drop housing 7, the screw rubber stator 9 and the TC bearing housing 13 are both threadedly connected to the flexible shaft housing 12, and the transmission shaft housing 14 is threadedly connected to the TC bearing housing 13. The movable valve seat 6 and the screw motor rotor 10 are both threadedly connected to the live hinge universal shaft 8. The screw motor rotor 10 and the transmission shaft 18 are both threadedly connected to the flexible shaft 11.

[0044] In actual use, the screw drill for the anti-self-locking continuous oil pipe provided by the present application flows through the flow hole of the anti-locking short section 1, through the moving valve seat 6 and the static valve alloy block 3, and flows through the screw motor assembly. The screw motor assembly converts the hydraulic energy of the liquid into mechanical energy, driving the transmission shaft 18 to rotate, thereby providing drilling power. In addition, the screw motor rotor 10 generates torque to drive the moving valve seat 6 to rotate, and the moving valve seat 6 is connected to the moving valve 4. The moving valve 4 rotates, changing the flow area of ​​the moving valve 4 and the static valve alloy block 3 to produce periodic hydraulic impact changes, generate axial pulling force, and the anti-locking short section 1 generates 10-15HZ vibration, reducing the friction between the continuous oil pipe and the well wall, thereby preventing the continuous oil pipe from being locked.

[0045] In summary, the embodiments of the present invention provide a screw drill for an anti-self-locking coiled tubing.

[0046] 1. Adjustable frequency. The vibration frequency of this technology is adjustable, and it can be adjusted by simply adjusting the distance between the moving and fixed valves at the anti-locking nipple 1 or changing the circulating pressure of the workover fluid;

[0047] 2. Stable vibration. The tool relies on the repeated staggering of the through holes of the moving and fixed valves at the anti-locking nipple 1 to achieve vibration. It is a pure mechanical movement. This hard characteristic determines the strong stability of the vibration.

[0048] 3. Long working life. The anti-locking structural components of this technology are made of hard alloy, and the short screw has small torque, which prolongs the working life of the tool.

[0049] 4. This technology has no special requirements for the solid content, pumping pressure and flow rate of the workover fluid. It only needs to meet the use requirements of the screw drill motor and has good on-site applicability.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments and that the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application.

[0051] Therefore, no matter from which point of view, the embodiments should be regarded as illustrative and non-restrictive, and the scope of the present application is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved. For those skilled in the art, the utility model can have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A screw drill for anti-self-locking coiled tubing, characterized in that: It includes an anti-lock assembly, a screw motor assembly, a flexure shaft assembly and a transmission assembly; The anti-lock assembly includes an anti-lock nipple, a static valve alloy block, a movable valve, a movable valve seat, an anti-drop housing, and a live hinge universal shaft. One end of the anti-lock nipple is provided with a static valve alloy block and embedded in the anti-drop housing; the movable valve seat is provided in the anti-drop housing, and the movable valve is provided at one end of the movable valve seat close to the static valve alloy block; The screw motor assembly includes a screw rubber stator and a screw motor rotor located inside the screw rubber stator, one end of the screw rubber stator is connected to the anti-drop housing; one end of the live hinge universal shaft is connected to the moving valve seat, and the other end of the live hinge universal shaft is embedded in the screw rubber stator and connected to one end of the screw motor rotor; The flex shaft assembly includes a flex shaft housing and a flex shaft located inside the flex shaft housing, one end of the flex shaft housing is connected to the screw rubber stator, and one end of the flex shaft is connected to one end of the screw motor rotor away from the live joint universal shaft; The transmission assembly includes a TC bearing housing, a transmission shaft housing, and a transmission shaft. One end of the TC bearing housing is connected to the flexible shaft housing, and the other end of the TC bearing housing is connected to the transmission shaft housing; one end of the flexible shaft away from the screw motor rotor passes through the TC bearing housing and is embedded in the transmission shaft housing; one end of the transmission shaft is embedded in the transmission shaft housing and is connected to the flexible shaft.

2. The anti-self-locking coiled tubing screw drill according to claim 1, characterized in that: The anti-locking assembly also includes a pressure cover, which is sleeved on the outer side wall of one end of the anti-locking short section close to the static valve alloy block, and the pressure cover is threadedly connected to the anti-locking short section.

3. The anti-self-locking coiled tubing screw drill according to claim 1, characterized in that: The anti-lock assembly also includes an anti-drop disk, which and the movable valve are both arranged on the outer side wall of the movable valve seat, the movable valve is located between the anti-drop disk and the static valve alloy block, and the movable valve is threadedly connected to the movable valve seat.

4. The anti-self-locking coiled tubing screw drill according to claim 1, characterized in that: The anti-locking short section is sleeved on the outer side wall of the static valve alloy block, and the static valve alloy block and the anti-locking short section are interference fit.

5. The anti-self-locking coiled tubing screw drill according to claim 1, characterized in that: The transmission assembly further comprises a spacer sleeve and a pressure-bearing sleeve, wherein the pressure-bearing sleeve is sleeved on the outside of the transmission shaft, the spacer sleeve is sleeved on the outside of the pressure-bearing sleeve, and the transmission shaft housing is sleeved on the outside of the spacer sleeve.

6. The anti-self-locking coiled tubing screw drill according to claim 1, characterized in that: The transmission assembly also includes a bearing string, and the bearing string is sleeved between the transmission shaft housing and the transmission shaft.

7. The anti-self-locking coiled tubing screw drill according to claim 1, characterized in that: The anti-locking nipple and the screw rubber stator are both threadedly connected to the anti-drop housing, the screw rubber stator and the TC bearing housing are both threadedly connected to the flexible shaft housing, and the transmission shaft housing is threadedly connected to the TC bearing housing.

8. The anti-self-locking coiled tubing screw drill according to claim 1, characterized in that: The movable valve seat and the screw motor rotor are both threadedly connected to the living hinge universal shaft.

9. The anti-self-locking coiled tubing screw drill according to claim 1, characterized in that: The screw motor rotor and the transmission shaft are both threadedly connected to the flexible shaft.

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