Directional steering gear and drilling tool for coiled tubing drilling

Abstract

The directional steering gear comprises a drill rod, an upper end motor rotor, an upper end flexible shaft and a flow channel switching mechanism, the drill rod is vertically arranged, and the upper end and the lower end of the drill rod are open; the upper-end motor rotor is vertically and rotatably mounted in the drill rod and is hollow, the upper end of the upper-end motor rotor is open, the lower end of the upper-end motor rotor is closed, and a drilling fluid hole penetrating inside and outside is formed in the side wall of the upper-end motor rotor; the upper-end flexible shaft is vertically mounted in the drill rod and located below the upper-end motor rotor, and the upper end of the upper-end flexible shaft is fixedly connected with the lower end of the upper-end motor rotor; the flow channel switching mechanism is installed in the drill rod, located above the upper end motor rotor and used for sealing or opening the upper end opening of the upper end motor rotor. The device has the beneficial effects that the structure is simple, the design is reasonable, the tool face where the drilling tool combination is located can be monitored and adjusted underground in real time, the drilling lifting frequency in the coiled tubing drilling process is reduced, and the drilling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploration drilling equipment, and in particular to a directional steering device and a drilling tool for continuous pipe drilling. Background Art

[0002] The development and application of coiled tubing drilling technology began in the 1990s, and it still has great research and development value. Under the trend of information technology of drilling equipment, the characteristic of coiled tubing that it does not need to be connected to a single piece during the drilling process makes it naturally have the basis for information technology upgrade. When drilling with coiled tubing, the steering device inside the tube needs to drive the bottom hole drilling tool assembly to rotate, so as to obtain the required posture, which can save time for adjusting the drilling tool and improve the efficiency of exploration and mining.

[0003] Coiled tubing drilling technology has the advantages of low cost, high efficiency, strong safety and reliability. In recent years, it has been widely used abroad and has achieved good economic benefits. The size of the coiled tubing has increased from 60.3mm in the early 1990s to 88.9mm. Between 1995 and 1997, at least 1,360 wells have been drilled, and its application in directional wells and horizontal wells has also increased. The United States and Canada are the two most active countries in coiled tubing drilling, accounting for about 80% of the world's coiled tubing drilling. France and the Netherlands also have a large number of applications. At present, some large oil service companies in the world are also carrying out or participating in coiled tubing drilling operations, among which Halliburton, Baker Hughes and other companies have an advantage. However, the domestic coiled tubing drilling technology started late, and there is no precedent for mature application of coiled tubing drilling on site, which is limited to the field of well repair operations. Different from conventional rotary drilling, the characteristic of coiled tubing that cannot rotate determines that it must rely on special downhole tools to achieve the drilling process, which is one of the main reasons restricting the development of coiled tubing drilling in China. Summary of the invention

[0004] The invention provides a directional steering device and a drilling tool for coiled tubing drilling, aiming to solve the problem of complicated coiled tubing orientation in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A directional steering device for continuous pipe drilling, comprising a drill pipe, an upper motor rotor, an upper flexure shaft and a flow channel switch mechanism, wherein the drill pipe is vertically arranged, and both the upper and lower ends thereof are open; the upper motor rotor is vertically rotatably installed in the drill pipe, and the interior thereof is hollow, and the upper end thereof is open and the lower end is closed, and a drilling fluid hole penetrating inside and outside is provided on the side wall of the upper motor rotor; the upper flexure shaft is vertically installed in the drill pipe, and is located below the upper motor rotor, and the upper end thereof is fixedly connected to the lower end of the upper motor rotor;

[0007] The flow channel switch mechanism is installed in the drill rod, and is located above the upper motor rotor, and is used to seal or open the upper end opening of the upper motor rotor.

[0008] The beneficial effects of the present invention are as follows: during operation, when it is necessary to change the angle of the tool face where the drill bit is located, the flow channel switch mechanism seals the upper end opening of the upper motor rotor, and the drilling fluid in the drill pipe flows in the area between the drill pipe and the upper motor rotor. At this time, there is a pressure difference between the inside and outside of the upper motor rotor, and the pressure difference drives the upper motor rotor to rotate to adjust the angle of the tool face where the drill bit is located;

[0009] When normal drilling operations are carried out, the flow channel switch mechanism opens the upper opening of the upper motor rotor, and a part of the drilling fluid in the drill pipe flows in the area between the drill pipe and the upper motor rotor, and the other part of the drilling fluid enters the interior of the upper motor rotor and is discharged from the drilling fluid holes on the side wall of the upper motor rotor. At this time, there is no pressure difference between the inside and outside of the upper motor rotor, so the upper motor rotor does not rotate, and drilling operations can be carried out at this time.

[0010] The present invention has a simple structure and a reasonable design, and can monitor and adjust the angle of the tool face where the drilling tool assembly is located in real time underground, thereby reducing the number of times the drill is lifted during continuous tubing drilling and improving drilling efficiency.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the flow channel switch mechanism includes a driving member, a slide rail and a locking column, the slide rail is vertically fixedly installed in the drill rod, the interior of the slide rail is hollow and both ends are open, the slide rail is located above the upper motor rotor, the lower end of the slide rail is fixedly connected and communicated with the upper end of the upper motor rotor, and at least one flow channel branch hole is provided on the slide rail;

[0013] The locking column is vertically installed in the slide rail and is threadedly connected to the inner wall of the slide rail, and has a structure that is thick at the lower end and thin at the upper end; the driving member is installed in the slide rail, is located above the locking column, and is fixedly connected to the upper end of the locking column, and is used to drive the locking column to rotate. The locking column utilizes the threaded connection between it and the slide rail to achieve up and down movement in the slide rail to seal or open the flow channel branch hole.

[0014] The beneficial effect of adopting the above further solution is that during the operation, when it is necessary to change the angle of the tool face where the drill bit is located, the driving member is closed and the thick end of the locking column seals the upper end opening of the upper motor rotor, and the drilling fluid in the drill pipe flows in the area between the drill pipe and the upper motor rotor. At this time, there is a pressure difference between the inside and outside of the upper motor rotor, and the pressure difference drives the upper motor rotor to rotate to adjust the angle of the tool face where the drill bit is located;

[0015] When normal drilling operation is carried out, the driving member starts and drives the locking column to rotate. The locking column uses the threaded connection between it and the slide rail to move up and down in the slide rail so that the thick end of the locking column opens the flow channel branch hole. At this time, part of the drilling fluid in the drill pipe flows in the area between the drill pipe and the upper motor rotor, and the other part of the drilling fluid enters the interior of the upper motor rotor. At this time, there is no pressure difference between the inside and outside of the upper motor rotor, so the upper motor rotor does not rotate, and drilling operation can be carried out at this time;

[0016] In addition, the locking column has a reasonable structural design and can effectively cooperate with the slide rail to realize the opening or closing of the flow channel branch hole, so as to switch the path of the drilling fluid and further realize the adjustment of the drill bit working surface.

[0017] Furthermore, the slide rail has a structure with a thick upper end and a thin lower end, the driving member is located in the thick end of the slide rail, the locking column is located in the thin end of the slide rail, and the flow channel branch hole is located on the thin end of the slide rail.

[0018] The beneficial effect of adopting the above further solution is that the structural design of the slide rail is reasonable, and the drive member and the locking column are conveniently installed without affecting each other.

[0019] Furthermore, the driving member includes a turbine motor, and the thick end surface of the slide rail is provided with at least one drainage hole penetrating inside and outside.

[0020] The beneficial effect of adopting the above further solution is that the drilling fluid in the drill pipe drives the turbine motor to rotate, thereby realizing the corresponding operation; in addition, the drilling fluid in the slide rail can be discharged through the drainage hole, thereby ensuring the normal operation of the turbine motor.

[0021] Furthermore, a large gear ring is installed in the drill pipe, the large gear ring is located outside the upper motor rotor and is rotatably connected to the drill pipe through a bearing; a rotor gear is coaxially fixed on the upper motor rotor, the rotor gear is located in the large gear ring and meshes with the large gear ring; a gap is provided between the rotor gear and the large gear ring for mud to pass through.

[0022] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the meshing force between the large gear ring and the rotor gear to achieve directional rotation of the upper motor rotor.

[0023] Furthermore, a real-time angle measurement mechanism is installed in the drill pipe, and the real-time angle measurement mechanism includes a magnet group and a measuring element. The magnet group is fixedly mounted on the large gear ring, and the measuring element is fixedly mounted on the inner wall of the drill pipe, and is used to measure the angle of the magnetic field formed by the magnet group and send the corresponding angle signal to the ground controller.

[0024] The beneficial effect of adopting the above further scheme is that during the adjustment of the working face of the drill bit, the angle of the magnetic field formed by the magnet group (i.e. the angle of the large gear ring) is measured by the measuring element, and the corresponding angle signal is sent to the ground controller. The angle variable of the tool face where the drill tool assembly is located is calculated according to the transmission ratio of the gear pair, thereby realizing real-time measurement and convenient measurement.

[0025] Furthermore, a rotation angle locking mechanism is installed in the drill rod, and the rotation angle locking mechanism is used to lock or release the upper motor rotor.

[0026] The beneficial effects of adopting the above further scheme are simple structure, reasonable design, locking or releasing the upper motor rotor through the angle locking mechanism, convenient positioning, ensuring that the drill bit working surface remains at the set angle, thereby ensuring the quality of drilling.

[0027] Furthermore, the angle locking mechanism includes an upper ratchet and a lower ratchet, the lower ratchet is fixedly sleeved on the lower end of the upper flexible shaft, the upper ratchet is sleeved outside the upper motor rotor, and is located between the large gear ring and the lower ratchet, and is connected to the locking column through a connecting piece; the end of the large gear ring close to the upper ratchet has a toothed structure, and the upper ratchet can move with the locking column to engage with one end face of the large gear ring or the lower ratchet.

[0028] A further beneficial effect of the scheme is that when the locking column slides in the slide rail, the upper end ratchet is engaged with one end face of the large gear ring or the lower end ratchet to achieve positioning of the locking column at a set position, which is convenient for positioning, simple in structure and reasonable in design.

[0029] Furthermore, the connecting member includes a skeleton, and two eccentric rings are coaxially fixedly connected at both ends of the skeleton, and the two eccentric rings are respectively sleeved on the outside of the slide rail and the upper end motor rotor and slidably connected; a clamping block is provided at the upper end of the skeleton, and a positioning groove is provided on the locking column, and the clamping block extends through the flow channel branch hole into the slide rail and is clamped with the positioning groove; the upper end ratchet is fixedly sleeved on the lower end of the skeleton.

[0030] The beneficial effects of adopting the above-mentioned further scheme are simple structure and reasonable design. The two eccentric rings on the skeleton are used to make the upper motor rotor and the drill rod eccentrically set, which is convenient for adjusting the angle of the tool surface where the drill bit is located; in addition, the positioning grooves on the clamping block and the locking column can realize the transmission connection between the upper ratchet and the locking column, which is convenient to connect and the various components do not affect each other.

[0031] The present invention also relates to a drilling tool, comprising a lower end motor rotor, a lower end flexible shaft, a drill bit and a directional steering device for continuous pipe drilling as described above, wherein the lower end motor rotor is vertically rotatably installed in the drill pipe and is located below the upper end flexible shaft; the lower end flexible shaft is vertically installed in the drill pipe and is located below the lower end motor rotor, and its upper end is fixedly connected to the lower end of the lower end motor rotor; the drill bit is fixedly installed at the lower end of the lower end flexible shaft.

[0032] The beneficial effect of adopting the above further solution is that during the operation, when it is necessary to change the angle of the tool face where the drill bit is located, the driving member is closed and the thick end of the locking column seals the upper end opening of the upper motor rotor, and the drilling fluid in the drill pipe flows in the area between the drill pipe and the upper motor rotor. At this time, there is a pressure difference between the inside and outside of the upper motor rotor, and the pressure difference drives the upper motor rotor to rotate to adjust the angle of the tool face where the drill bit is located;

[0033] When normal drilling operations are carried out, the drive component starts and drives the locking column to rotate. The locking column uses the threaded connection between it and the slide rail to move up and down in the slide rail so that the thick end flow channel of the locking column branches out. At this time, part of the drilling fluid in the drill pipe flows in the area between the drill pipe and the upper motor rotor, and the other part of the drilling fluid enters the interior of the upper motor rotor. At this time, there is no pressure difference between the inside and outside of the upper motor rotor, so the upper motor rotor does not rotate, and drilling operations can be carried out at this time. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 It is a partial structural schematic diagram of the present invention;

[0036] Figure 3 This is one of the structural schematic diagrams of the slide rail in the present invention;

[0037] Figure 4 This is the second structural schematic diagram of the slide rail in the present invention;

[0038] Figure 5 It is a schematic diagram of the internal structure of the slide rail in the present invention;

[0039] Figure 6 It is a schematic diagram of the structure of the turbine motor and the locking column in the present invention;

[0040] Figure 7 Schematic diagram of the three-dimensional structure of the skeleton in the present invention;

[0041] Figure 8 It is a cross-sectional view of the skeleton in the present invention.

[0042] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0043] 1. Drill pipe; 2. Upper motor rotor; 3. Upper flexure shaft; 4. Drilling fluid hole; 5. Slide rail; 6. Locking column; 7. Flow channel branch hole; 8. Turbine motor; 9. Drain hole; 10. Large gear ring; 11. Bearing; 12. Rotor gear; 13. Gap; 14. Upper ratchet; 15. Lower ratchet; 16. Frame; 17. Block; 18. Positioning groove; 19. Lower motor rotor; 20. Lower flexure shaft; 21. Eccentric ring; 22. Magnet; 23. Hall ring. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0046] In the description of the present invention, it should be noted that, 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 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 invention can be understood by specific circumstances.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0048] Example 1

[0049] like Figures 1 to 8As shown, this embodiment provides a directional steering device for coiled tubing drilling, comprising a drill pipe 1, an upper motor rotor 2, an upper flexure shaft 3 and a flow channel switch mechanism, wherein the drill pipe 1 is vertically arranged, and both the upper and lower ends thereof are open; the upper motor rotor 2 is vertically rotatably installed in the drill pipe 1, and the interior thereof is hollow, and the upper end thereof is open and the lower end is closed, and a drilling fluid hole 4 penetrating inside and outside is provided on the side wall of the upper motor rotor 2; the upper flexure shaft 3 is vertically installed in the drill pipe 1, and is located below the upper motor rotor 2, and the upper end thereof is fixedly connected to the lower end of the upper motor rotor 2;

[0050] The flow channel switch mechanism is installed in the drill rod 1 , and is located above the upper motor rotor 2 , and is used to seal or open the upper end opening of the upper motor rotor 2 .

[0051] During the operation, when normal drilling operation is carried out, the flow channel switch mechanism opens the upper end opening of the upper motor rotor 2, and a part of the drilling fluid in the drill pipe 1 flows in the area between the drill pipe and the upper motor rotor 2, and the other part of the drilling fluid enters the interior of the upper motor rotor 2 and is discharged from the drilling fluid hole 4 on the side wall of the upper motor rotor 2. At this time, there is no pressure difference between the inside and outside of the upper motor rotor 2, so the upper motor rotor 2 does not rotate, and the drilling operation can be carried out at this time;

[0052] The design of the drilling fluid hole 4 ensures that the drilling fluid entering the interior of the upper motor rotor 2 can be discharged smoothly, thereby ensuring effective adjustment of the drill bit tool face.

[0053] When it is necessary to change the angle of the tool face where the drill bit is located, the flow channel switch mechanism seals the upper open end of the upper motor rotor 2, and the drilling fluid in the drill pipe 1 flows in the area between the drill pipe 1 and the upper motor rotor 2. At this time, there is a pressure difference between the inside and outside of the upper motor rotor 2, and the pressure difference drives the upper motor rotor 2 to rotate to adjust the angle of the tool face where the drill bit is located.

[0054] Preferably, in this embodiment, the drill rod 1 is a circular tube.

[0055] It should be noted that the connection method between the upper motor rotor 2 and the drill pipe 1 adopts the existing technology.

[0056] This embodiment has a simple structure and a reasonable design, and can monitor and adjust the angle of the tool face of the drill assembly in real time underground, thereby reducing the number of drill lifting times during coiled tubing drilling and improving drilling efficiency.

[0057] Example 2

[0058] On the basis of Example 1, in this embodiment, the flow channel switch mechanism includes a driving member, a slide rail 5 and a locking column 6. The slide rail 5 is vertically fixedly installed in the drill rod 1, and its interior is hollow and both ends are open. The slide rail 5 is located above the upper motor rotor 2, and its lower end is fixedly connected and communicated with the upper end of the upper motor rotor 2, and at least one flow channel branch hole 7 is provided thereon;

[0059] The locking column 6 is vertically installed in the slide rail 5 and is threadedly connected to the inner wall of the slide rail 5. It has a structure with a thick lower end and a thin upper end. The driving member is installed in the slide rail 5, located above the locking column 6, and fixedly connected to the upper end of the locking column 6, and is used to drive the locking column 6 to rotate. The locking column 6 utilizes the threaded connection between it and the slide rail 5 to achieve up and down movement in the slide rail 5 to seal or open the flow channel branch hole 7.

[0060] During the operation, when normal drilling operation is carried out, the driving member starts and drives the locking column 6 to rotate. The locking column 6 uses the threaded connection between it and the slide rail 5 to realize the up and down movement in the slide rail 5 so that the thick end of the locking column 6 opens the flow channel branch hole 7. At this time, part of the drilling fluid in the drill pipe 1 flows in the area between the drill pipe 1 and the upper motor rotor 2, and the other part of the drilling fluid enters the interior of the upper motor rotor 2. At this time, there is no pressure difference between the inside and outside of the upper motor rotor 2, so the upper motor rotor 2 does not rotate, and the drilling operation can be carried out at this time;

[0061] When it is necessary to change the angle of the tool face where the drill bit is located, the driving member is closed and the thick end of the locking column 6 seals the upper end opening of the upper motor rotor 2. The drilling fluid in the drill pipe 1 flows in the area between the drill pipe 1 and the upper motor rotor 2. At this time, there is a pressure difference between the inside and outside of the upper motor rotor 2. The pressure difference drives the upper motor rotor 2 to rotate to adjust the angle of the tool face where the drill bit is located.

[0062] In addition, the locking column 6 has a reasonable structural design and can effectively cooperate with the slide rail 5 to realize the opening or closing of the flow channel branch hole 7, so as to switch the path of the drilling fluid and further realize the adjustment of the drill bit working surface.

[0063] Preferably, in this embodiment, the slide rail 5 is preferably a cylindrical structure.

[0064] Preferably, in this embodiment, the number of the drilling fluid hole 4 can be one or more. When the number of the drilling fluid holes 4 is more than one, they are evenly spaced at the lower end of the slide rail 5 along the circumference of the slide rail 5 .

[0065] Preferably, in this embodiment, the locking column 6 is preferably a cylindrical structure.

[0066] Preferably, in this embodiment, the number of the flow channel branch holes 7 is preferably multiple, and the multiple flow channel branch holes 7 are evenly spaced and distributed along the circumference of the slide rail 5 .

[0067] Furthermore, the plurality of flow channel branch holes 7 are preferably respectively elongated strip-shaped holes, which respectively extend along the axial direction of the slide rail 5 .

[0068] Example 3

[0069] On the basis of Example 2, in this embodiment, the slide rail 5 has a structure that is thick at the upper end and thin at the lower end, the driving member is located in the thick end of the slide rail 5, the locking column 6 is located in the thin end of the slide rail 5, and the flow channel branch hole 7 is located on the thin end of the slide rail 5.

[0070] The structural design of the above-mentioned slide rail is reasonable, and the drive member and the locking column 6 are conveniently installed without affecting each other.

[0071] Alternatively, the slide rail 5 may also have a structure with a consistent diameter.

[0072] Example 4

[0073] On the basis of Example 3, in this embodiment, the driving member includes a turbine motor 8, and at least one drainage hole 9 penetrating inside and outside is provided on the thick end surface of the slide rail 5.

[0074] The drilling fluid in the drill pipe 1 drives the turbine motor 8 to rotate to achieve corresponding operations; in addition, the drilling fluid in the slide rail 5 can be discharged through the drainage hole 9 to ensure the normal operation of the turbine motor 8.

[0075] Preferably, in this embodiment, the number of the drainage holes 9 is preferably multiple, and the multiple drainage holes 9 are evenly spaced and distributed along the circumference of the slide rail 5 .

[0076] Example 5

[0077] On the basis of any one of Examples 2 to 4, in this embodiment, a large gear ring 10 is installed in the drill pipe 1, and the large gear ring 10 is located outside the upper motor rotor 2 and is rotatably connected to the drill pipe 1 through a bearing 11; a rotor gear 12 is coaxially fixed on the upper motor rotor 2, and the rotor gear 12 is located in the large gear ring 10 and meshes with the large gear ring 10; a gap 13 for mud to pass through is provided between the rotor gear 12 and the large gear ring 10.

[0078] This solution has a simple structure and a reasonable design, and utilizes the meshing force between the large gear ring 10 and the rotor gear 12 to achieve directional rotation of the upper motor rotor 2.

[0079] Example 6

[0080] On the basis of Example 5, in this embodiment, a real-time angle measurement mechanism is also installed in the drill rod 1, and the real-time angle measurement mechanism includes a magnet group and a measuring element. The magnet group is fixedly mounted on the large gear ring 10, and the measuring element is fixedly mounted on the inner wall of the drill rod 1, and is used to measure the angle of the magnetic field formed by the magnet group and send the corresponding angle signal to the ground controller.

[0081] During the adjustment of the working surface of the drill bit, the angle of the magnetic field formed by the magnet group, i.e., the angle of the drill bit, is measured by the measuring element, and the corresponding angle signal is sent to the ground controller, thus realizing real-time measurement and facilitating measurement.

[0082] Preferably, in this embodiment, the magnet group preferably includes a plurality of magnets 22, and a plurality of embedding grooves are evenly spaced along the circumference of the outer side of the large gear ring 10, and the plurality of magnets 22 are respectively embedded in the plurality of embedding grooves to save space.

[0083] In addition, the measuring element includes a plurality of Hall rings 23, which are evenly spaced and fixedly installed on the inner wall of the drill pipe 1 along the circumference of the drill pipe 1, and correspond to the plurality of magnets one by one. During operation, the plurality of Hall rings 23 respectively measure the rotation angle of the magnetic field formed by the magnet group, that is, the rotation angle of the drill bit, and send the corresponding rotation angle signal to the ground controller through the line, so as to realize real-time measurement and facilitate measurement.

[0084] Furthermore, the plurality of Hall rings 23 are connected to a ground controller via lines respectively.

[0085] Example 7

[0086] On the basis of any one of Embodiments 5 to 6, in this embodiment, a rotation angle locking mechanism is further installed in the drill rod 1 , and the rotation angle locking mechanism is used to lock or release the upper motor rotor 2 .

[0087] This solution has a simple structure and a reasonable design. The upper motor rotor 2 is locked or released by the angle locking mechanism, which is convenient for positioning and ensures that the drill bit working surface is maintained at a set angle, thereby ensuring the quality of drilling.

[0088] Example 8

[0089] On the basis of Example 7, in this embodiment, the angle locking mechanism includes an upper ratchet 14 and a lower ratchet 15, the lower ratchet 15 is fixedly sleeved on the lower end of the upper flexible shaft 3, the upper ratchet 14 is sleeved outside the upper motor rotor 2, and is located between the large gear ring 10 and the lower ratchet 15, and is connected to the locking column 6 through a connecting piece; the end of the large gear ring 10 close to the upper ratchet 14 has a toothed structure, and the upper ratchet 14 can move with the locking column 6 to engage with one end face of the large gear ring 10 or the lower ratchet 15.

[0090] When the locking column 6 slides in the slide rail, the upper ratchet 14 is engaged with one end surface of the large gear ring 10 or the lower ratchet 15 to achieve positioning of the locking column 6 at a set position, which has convenient positioning, simple structure and reasonable design.

[0091] Example 9

[0092] On the basis of Example 8, in this embodiment, the connecting member includes a skeleton 16, and two eccentric rings 21 are coaxially fixedly connected at both ends of the skeleton 16, and the two eccentric rings 21 are respectively sleeved on the outside of the slide rail 5 and the upper end motor rotor 2 and slidably connected; the upper end of the skeleton 16 is provided with a clamping block 17, and the locking column 6 is provided with a positioning groove 18, and the clamping block 17 extends through the flow channel branch hole 7 to the slide rail 5 and is engaged with the positioning groove 18; the upper end ratchet 14 is fixedly sleeved on the lower end of the skeleton 16.

[0093] This solution has a simple structure and a reasonable design. The two eccentric rings 21 on the skeleton 16 are used to make the upper motor rotor 2 and the drill rod 1 eccentrically arranged, which is convenient for adjusting the angle of the tool surface where the drill bit is located. In addition, the upper ratchet 14 and the locking column 6 can be connected in transmission by using the positioning groove 18 on the clamping block 17 and the locking column. The connection is convenient and the various components do not affect each other.

[0094] It should be noted that the above-mentioned skeleton 16 is located outside the slide rail 5, not inside the slide rail 5, and the drawings only show the relative position of the skeleton 16.

[0095] Example 10

[0096] On the basis of the above embodiments, this embodiment also provides a drilling tool, including a lower end motor rotor 19, a lower end flexible shaft 20, a drill bit and the directional steering device for continuous pipe drilling as described above, wherein the lower end motor rotor 19 is vertically rotatably installed in the drill pipe 1, and is located below the upper end flexible shaft 3; the lower end flexible shaft 20 is vertically installed in the drill pipe 1, and is located below the lower end motor rotor 19, and its upper end is fixedly connected to the lower end of the lower end motor rotor 19; the drill bit is fixedly installed at the lower end of the lower end flexible shaft 20.

[0097] During the operation, when normal drilling operation is carried out, the driving member starts and drives the locking column 6 to rotate. The locking column 6 uses the threaded connection between it and the slide rail 5 to realize the up and down movement in the slide rail 5 so that the thick end of the locking column 6 opens the flow channel branch hole. At this time, part of the drilling fluid in the drill pipe 1 flows in the area between the drill pipe 1 and the upper motor rotor 2, and the other part of the drilling fluid enters the interior of the upper motor rotor 2. At this time, there is no pressure difference between the inside and outside of the upper motor rotor 2, so the upper motor rotor 2 does not rotate. At this time, the lower motor rotor 19 and the lower flexible shaft 20 rotate and drive the drill bit to rotate to carry out drilling operations;

[0098] When it is necessary to change the angle of the tool face where the drill bit is located, the driving part is closed and the thick end of the locking column 6 seals the upper open end of the upper motor rotor 2. The drilling fluid in the drill pipe 1 flows in the area between the drill pipe 1 and the upper motor rotor 2. At this time, there is a pressure difference between the inside and outside of the upper motor rotor 2. The pressure difference drives the upper motor rotor 2 to rotate to adjust the angle of the tool face where the drill bit is located. After the adjustment is completed, the above-mentioned drilling operation is continued.

[0099] Based on the above scheme, the drill rod 1 is spliced ​​by a long drill rod at the top and a bent drill rod at the bottom. The upper motor rotor 2 and the upper flexible shaft 3 are located in the long drill rod, the lower motor rotor 19 is located in the lower end of the long drill rod, and the upper end of the lower flexible shaft 20 extends to the lower end of the long drill rod, and its lower end is bent synchronously with the bent drill rod.

[0100] In addition, the lower motor rotor 19 is a solid structure.

[0101] The working principle of the present invention is as follows:

[0102] When normal drilling operation is carried out, the driving member starts and drives the locking column 6 to rotate. The locking column 6 uses the threaded connection between it and the slide rail 5 to realize the up and down movement in the slide rail 5 so that the thick end of the locking column 6 opens the flow channel branch hole. At this time, the drilling fluid in the drill pipe 1 enters the interior of the upper motor rotor 2. At this time, there is no pressure difference between the inside and outside of the upper motor rotor 2, and the upper motor rotor 2 does not rotate. At this time, the lower motor rotor 19 and the lower flexible shaft 20 rotate and drive the drill bit to rotate to carry out drilling operations (see attached Figure 2 Route A in

[0103] When it is necessary to change the angle of the tool face where the drill bit is located, the driving member is closed and the thick end of the locking column 6 seals the upper end opening of the upper motor rotor 2. The drilling fluid in the drill pipe 1 flows in the area between the drill pipe 1 and the upper motor rotor 2. At this time, there is a pressure difference between the inside and outside of the upper motor rotor 2. The pressure difference drives the upper motor rotor 2 to rotate to adjust the angle of the tool face where the drill bit is located. After the adjustment is completed, the above-mentioned drilling operation is continued (see Appendix). Figure 2 Route B).

[0104] In addition, since the present invention can make the drill bit rotate in one direction without restriction, the continuous pipe of the present invention can realize compound drilling in addition to adjusting the posture during the drilling process.

[0105] It should be noted that the arrows in the accompanying drawings only refer to the flow routes of the drilling fluid (route A and route B) and have no other substantial meanings.

[0106] The connection position of the steering gear provided by the present invention is located at the lower end of the screw drill, and one of its functions is to drive the lower screw drill assembly to rotate as a whole. When stable drilling is required, the connected screw drill housing needs to be locked at a fixed angle. In order to overcome the counter-torque of the lower screw drill, the locking mechanism needs to have a certain torsion resistance to ensure the stability of the locked tool surface. Because the internal rotor cannot rotate after the steering gear is locked, and the mud must circulate, a hollow liquid circulation channel is also required after locking to prevent the rotor from being unable to stop due to excessive pressure drop.

[0107] Another function of the steering gear is to drive the screw drill connected at the lower end to rotate as a whole, which requires an unlocking mechanism and a flow channel switching mechanism to ensure that the mud flows through the rotor and stator of the steering gear to work normally. When the angle of the tool face where the drill tool assembly is located is fixed, the two ratchets mentioned above are in a meshing state, and the hollow flow channel of the motor rotor is opened. At this time, the mud basically flows through this flow channel to the drill bit, and the flow rate between the meshing surfaces of the motor stator and rotor is basically zero. At this time, the motor does not rotate; when it is necessary to change the angle of the tool face where the drill tool assembly is located, the motor drives the locking column to rotate until the locking column completely closes the flow channel of the motor rotor. At this time, the mud can only flow through the meshing surfaces of the stator and rotor. After the pressure drop exceeds the critical value, since the ratchet at the upper end of the rotor is in a non-meshing state, the rotor can rotate, and its torque is transmitted to the drill tool assembly through the flexure. Figure 5 As shown, the conversion mechanism is embedded in the locking column, which allows the Y-shaped transmission arm to pass through the gap between the inner and outer gears without interfering with other structures. When the angle of the tool face where the drilling tool assembly is located is about to reach the expected value, the motor is promptly controlled to reverse, the locking column moves upward, the hollow flow channel of the motor rotor is opened, and the upper end ratchet that moves synchronously with the locking column resumes meshing, completing the locking of the tool face.

[0108] The entire system is controlled by ground equipment through cables. For the screw steering gear itself, the required cables are the angle measuring element wire and the remote control motor signal wire, a total of three (one for transmitting the motor control signal and two for the angle measuring element). They are all fixed on the inner surface of the drill pipe and do not rotate with the drill bit assembly. The posture information of the downhole tool is transmitted to the ground in real time. With the appropriate rotation speed, when the angle approaches the target value, the ground inputs the flow channel to the steering gear to open (i.e. the upper end ratchet engages) the command, thus completing the action of adjusting the tool face. It is simple and fast and does not require lifting the drill.

[0109] The directional steering device provided by the present invention can avoid the defect that the drill rod needs to be repeatedly lifted to adjust the tool face during operation. The drill rod can complete the tool face control underground and the drilling direction can be changed timely and accurately through the steering device.

[0110] In addition, the directional screw steering device has great application value in drilling shallow injection wells, opening windows in old wells, deepening old wells and drilling directional wells.

[0111] It should be noted that all electronic components involved in the present invention adopt the existing technology, and the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is the existing technology.

[0112] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0113] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A directional steering device for coiled tubing drilling, characterized in that: The invention comprises a drill pipe (1), an upper motor rotor (2), an upper flexible shaft (3) and a flow channel switch mechanism. The drill pipe (1) is arranged vertically, and its upper and lower ends are both open. The upper motor rotor (2) is installed in the drill pipe (1) for vertical rotation, and its interior is hollow, and its upper end is open and its lower end is closed. The side wall of the upper motor rotor (2) is provided with a drilling fluid hole (4) penetrating inside and outside. The upper flexible shaft (3) is installed vertically in the drill pipe (1), and is located below the upper motor rotor (2), and its upper end is fixedly connected to the lower end of the upper motor rotor (2). The flow channel switch mechanism is installed in the drill rod (1) and is located above the upper motor rotor (2) and is used to seal or open the upper end opening of the upper motor rotor (2).

2. The directional steering device for coiled tubing drilling according to claim 1, characterized in that: The flow channel switch mechanism comprises a driving member, a slide rail (5) and a locking column (6); the slide rail (5) is vertically fixedly installed in the drill rod (1), the interior of the slide rail is hollow and both ends are open; the slide rail (5) is located above the upper motor rotor (2), the lower end of the slide rail is fixedly connected to and communicates with the upper end of the upper motor rotor (2), and at least one flow channel branch hole (7) is provided on the slide rail; The locking column (6) is vertically installed in the slide rail (5) and is threadedly connected to the inner wall of the slide rail (5), and has a structure with a thick lower end and a thin upper end; the driving member is installed in the slide rail (5), is located above the locking column (6), and is fixedly connected to the upper end of the locking column (6), and is used to drive the locking column (6) to rotate. The locking column (6) moves up and down in the slide rail (5) to seal or open the flow channel branch hole (7).

3. The directional steering device for coiled tubing drilling according to claim 2, characterized in that: The slide rail (5) has a structure with a thick upper end and a thin lower end, the driving member is located in the thick end of the slide rail (5), the locking column (6) is located in the thin end of the slide rail (5), and the flow channel branch hole (7) is located on the thin end of the slide rail (5).

4. The directional steering device for coiled tubing drilling according to claim 3, characterized in that: The driving member comprises a turbine motor (8), and the thick end surface of the slide rail (5) is provided with at least one drainage hole (9) penetrating inside and outside.

5. The directional steering device for coiled tubing drilling according to any one of claims 2 to 4, characterized in that: A large gear ring (10) is installed in the drill pipe (1), the large gear ring (10) is located outside the upper motor rotor (2), and is rotatably connected to the drill pipe (1) through a bearing (11); a rotor gear (12) is coaxially fixed on the upper motor rotor (2), the rotor gear (12) is located in the large gear ring (10), and is meshed with the large gear ring (10); a gap (13) for mud to pass through is provided between the rotor gear (12) and the large gear ring (10).

6. The directional steering device for coiled tubing drilling according to claim 5, characterized in that: A real-time angle measurement mechanism is also installed in the drill rod (1), and the real-time angle measurement mechanism comprises a magnet group and a measuring element. The magnet group is fixedly installed on the large gear ring (10), and the measuring element is fixedly installed on the inner wall of the drill rod (1) and is used to measure the rotation angle of the magnetic field formed by the magnet group.

7. The directional steering device for coiled tubing drilling according to claim 5, characterized in that: A rotation angle locking mechanism is also installed in the drill rod (1), and the rotation angle locking mechanism is used to lock or release the upper end motor rotor (2).

8. The directional steering device for coiled tubing drilling according to claim 7, characterized in that: The rotation angle locking mechanism comprises an upper ratchet (14) and a lower ratchet (15), wherein the lower ratchet (15) is fixedly sleeved on the lower end of the upper flexible shaft (3), and the upper ratchet (14) is sleeved outside the upper motor rotor (2), and is located between the large gear ring (10) and the lower ratchet (15), and is connected to the locking column (6) through a connecting piece; one end of the large gear ring (10) close to the upper ratchet (14) is in a toothed structure, and the upper ratchet (14) can move with the locking column (6) to engage with one end face of the large gear ring (10) or the lower ratchet (15).

9. The directional steering device for coiled tubing drilling according to claim 8, characterized in that: The connecting member comprises a frame (16), two eccentric rings (21) are coaxially fixedly connected at both ends of the frame (16), and the two eccentric rings (21) are respectively sleeved on the outside of the slide rail (5) and the upper end motor rotor (2) and slidably connected; a clamping block (17) is provided at the upper end of the frame (16), and a positioning groove (18) is provided on the locking column (6); the clamping block (17) passes through the flow channel branch hole (7) and extends into the slide rail (5), and is clamped with the positioning groove (18); the upper end ratchet (14) is fixedly sleeved on the lower end of the frame (16).

10. A drilling tool, characterized in that: The invention comprises a lower motor rotor (19), a lower flexible shaft (20), a drill bit and a directional steering device for continuous pipe drilling as claimed in any one of claims 1 to 9, wherein the lower motor rotor (19) is vertically rotatably installed in the drill pipe (1) and is located below the upper flexible shaft (3); the lower flexible shaft (20) is vertically installed in the drill pipe (1) and is located below the lower motor rotor (19), and its upper end is fixedly connected to the lower end of the lower motor rotor (19); the drill bit is fixedly installed at the lower end of the lower flexible shaft (20).

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