A dynamic switching device for drilling mode for coiled tubing drilling

Abstract

The present invention relates to the field of coiled tubing drilling control equipment, specifically disclosing a dynamic drilling mode switching device for coiled tubing drilling. The device comprises a first screw motor, one end of the first screw motor's rotor connected to the coiled tubing and the other end connected to one end of a clutch. The other end is equipped with a detection element for monitoring the rotational position of the coiled tubing. An automatic on / off switch is connected to the first screw motor's fluid inlet channel, controlling the closing or opening of the channel. The other end of the clutch is connected to an electrically controlled directional control via an input shaft, and the other end of the clutch is controlled by the drive closing end of the automatic on / off switch. The electrically controlled directional control adjusts the rotational angle of the input shaft, and the clutch controls the connection and disconnection of the torque transmitted from the input shaft to the rotor of the first screw motor. This device can address the problem of stable switching between directional and reversing drilling in coiled tubing drilling.

Description

Technical Field

[0001] The invention relates to the field of coiled tubing drilling control equipment, in particular to a drilling mode dynamic switching device for coiled tubing drilling. Background Art

[0002] Amidst low oil prices, long drilling cycles, and rising drilling costs, major oilfields are increasingly pursuing slim-hole drilling, sidetracking old wells, and reducing costs and increasing efficiency. Coiled tubing drilling technology is gaining favor with major oilfields due to its advantages, including a small footprint, suitability for slim-hole drilling and re-drilling old wells, safe underbalanced drilling, shortened drilling cycles, reduced operator staff, and lower drilling costs. Compared to traditional drill pipe drilling, coiled tubing drilling eliminates the need for single-rod splices, shortening tripping and in-hole times. When re-drilling old wells (deepening or sidetracking), the small diameter of the coiled tubing allows for through-the-tubing operations, eliminating the need to remove existing production equipment, enabling simultaneous production while drilling and significantly reducing costs. The coiled tubing's built-in cable enables real-time transmission of logging-while-drilling data and supports command issuance, enabling uplink and downlink functionality.

[0003] When conducting directional well, horizontal well, and side drilling operations with coiled tubing, the wellbore trajectory needs to be adjusted. To achieve the effect of adjusting the wellbore trajectory, the lower end of the coiled tubing is connected to an angle drill bit driven by a screw motor. However, since the coiled tubing cannot dynamically control the rotation of a specified angle, it cannot automatically switch to the required drilling direction and drill stably in the required drilling direction. Therefore, when switching between directional drilling and reversing steady-angle drilling conditions, the screw drill tool needs to be pulled out of the drill hole and replaced. Frequent pulling out of the drill hole not only increases the operating cost and cycle, but also causes premature fatigue of the coiled tubing and shortens its service life. To solve this problem, the patented invention designs a dynamic switching drilling mode device for coiled tubing drilling, which realizes the function of switching between directional drilling and steady-angle drilling downhole, and can adjust the directional angle in real time to reduce the number of pull-outs. Summary of the Invention

[0004] The purpose of the present invention is to provide a dynamic switching device for coiled tubing drilling to solve the problem of coiled tubing drilling being unable to achieve stable switching between directional and reversing drilling in the wellbore. This purpose of the present invention can be achieved through the following technical solutions:

[0005] A dynamic drilling mode switching device for coiled tubing drilling comprises a first screw motor, wherein one end of the rotor of the first screw motor is connected to the coiled tubing for driving the coiled tubing to rotate, and the other end is connected to one end of a clutch. The other end is provided with a detection element for monitoring the rotational position of the coiled tubing. An automatic on-off switch is connected to the fluid inlet passage of the first screw motor for controlling the closing or opening of the fluid inlet passage of the first screw motor. The other end of the clutch is connected to an electrically controlled direction-directing device via an input shaft, and the other end of the clutch is controlled by the driving closing end of the automatic on-off switch. The electrically controlled direction-directing device is used to adjust the rotational angle of the input shaft, and the clutch is used to control the connection or disconnection of the rotor torque transmitted by the input shaft to the first screw motor.

[0006] In a further solution, the automatic opening and closing switch includes a discharge channel, an inlet channel, a diverter valve head, a connecting rod and an automatic telescopic rod. The clutch includes a clutch housing, an upper spline sleeve, a spline transmission shaft and a lower spline sleeve. The reset device includes a spiral guide sleeve, a sliding pin and an angle sensor. One end of the inlet channel is used to communicate with the liquid inlet channel of the first screw motor, and the other end is rotatably connected to the clutch housing and connected to the lower spline sleeve for inputting liquid. One end of the discharge channel is connected to the inlet channel through the diverter valve head, and the other end is connected to the liquid inlet of the continuous tube. The diverter valve head is connected to the inlet channel through a connecting rod. The spline transmission shaft is connected to the telescopic end of the automatic telescopic rod, and the fixed end of the automatic telescopic rod is fixedly connected to the input shaft. The upper end of the spline transmission shaft is slidably connected to the upper spline sleeve, and the lower end of the spline transmission shaft is slidably connected to the lower spline sleeve. The upper spline sleeve and the lower spline sleeve are respectively connected to the input shaft and the inlet channel. The spiral guide sleeve is provided in the lower spline sleeve, and a sliding pin is provided on the spline transmission shaft. The sliding pin is slidably connected to the spiral guide sleeve. The angle sensor is provided at the end of the input shaft, and the angle sensor determines the rotation angle of the input shaft according to the sliding distance of the sliding pin on the spiral surface of the spiral guide sleeve.

[0007] In a further solution, the spiral guide sleeve includes a spiral track a and a straight groove track b, the straight groove track b is connected to the spiral track a, and the sliding pin can slide along the spiral track a into the straight groove track b to drive the spline transmission shaft to spirally rise.

[0008] In a further solution, a centralizer is connected to the outside of the connecting rod, and the connecting rod is slidably connected to the inner wall of the inlet channel through the centralizer.

[0009] In a further solution, an outer ring of the centralizer is provided with an elastic centralizing belt, and the elastic centralizing belt is used to reduce the vibration amplitude at the connecting rod.

[0010] In a further solution, the other end of the inlet channel is connected to the clutch through an upper transmission shaft assembly, and the upper transmission shaft assembly is used for the rotation of the inlet channel and the communication of the inlet channel.

[0011] In a further solution, the upper transmission shaft assembly includes a bearing and a rotating shaft. The outer ring of the rotating shaft is rotatably connected to the clutch housing through the bearing, and the two ends are respectively used to transmit torque between the inlet channel and the lower spline sleeve.

[0012] In a further solution, the rotor of the first screw motor has a hollow shaft cavity, and the rotor is driven to rotate on the stator by the high-pressure fluid input into the liquid inlet channel. The stator is connected to the clutch housing through the upper transmission shaft assembly, and the hollow shaft cavity is connected to the leakage channel.

[0013] In a further solution, the fixed end of the automatic telescopic rod is rotatably connected to the conveying shaft through a bearing seat.

[0014] In a further solution, one end of the first screw motor is connected to the clutch through an upper transition joint and an upper transmission shaft assembly in sequence, and the other end is connected to the coiled tubing through a lower transition joint and a lower transmission shaft assembly in sequence.

[0015] Beneficial effects of the present invention:

[0016] This device can switch between coiled tubing drilling modes: adjusting the angle of the second screw motor at the coiled tubing (i.e., the drill bit at the front of the coiled tubing) to a specified angle for sliding directional drilling, or dynamically rotating the tool angle of the second screw motor (i.e., the drill bit at the front of the coiled tubing) for stable angle drilling (drilling at a stable angle), achieving dual-function dynamic switching. This structure allows for flexible switching of drilling modes without the need to trip the drill bit to replace the screw motor. This not only improves coiled tubing operation efficiency and extends its life, but also enhances the ability to control complex wellbore trajectories, providing broader development opportunities for coiled tubing drilling technology.

[0017] The device adopts modular design, has strong interchangeability and stable and reliable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of a dynamic switching drilling mode switching device for coiled tubing drilling according to an embodiment of the present invention;

[0020] Figure 2Schematic diagram of a clutch engaged and disengaged state according to an embodiment of the present invention;

[0021] Figure 3 This is a structural diagram of a spiral guide sleeve in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the open and closed states of an automatic opening and closing switch in an embodiment of the present invention;

[0023] In the figure: 1, input shaft; 2, bearing seat; 3, automatic telescopic rod; 4, upper splined sleeve; 4a, internal spline of upper splined sleeve; 4b, lower end face of upper splined sleeve; 5, splined transmission shaft; 5a, external spline of splined transmission shaft; 5b, external spline of splined transmission shaft; 5c, lower end face of shaft shoulder; 5d, upper end face of shaft shoulder; 6, clutch housing; 7, lower splined sleeve; 7a, internal spline of lower splined sleeve; 7b, upper end face of lower splined sleeve Surface; 8, spiral guide sleeve; 8a, spiral track; 8b, straight groove track; 9, sliding pin; 10, connecting rod; 11, upper drive shaft assembly; 12, stabilizer; 13, diverter valve head; 13a, conical surface; 14, discharge channel; 14a, conical hole; 15, upper transition joint; 16, rotor; 17, stator; 18, lower transition joint; 19, lower drive shaft assembly; 20, inlet channel; 11a, hole. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] like Figure 1 As shown, a dynamic drilling mode switching device for coiled tubing drilling includes a first screw motor 01. One end of the rotor 16 of the first screw motor 01 is connected to the coiled tubing for driving the coiled tubing to rotate, and the other end is connected to one end of a clutch 02. The other end is also provided with a detection element 03 for monitoring the rotational position of the coiled tubing. An automatic on-off switch 04 is connected to the liquid inlet channel of the first screw motor 01 and is used to control the closing or opening of the liquid inlet channel of the first screw motor 01. The other end of the clutch 02 is connected to the electronically controlled direction-control device via the input shaft 1. The other end of the clutch 02 is controlled by the driving closing end of the automatic on-off switch 04 to engage or disengage the clutch 02. The electronically controlled direction-control device is used to adjust the rotation angle of the input shaft 1. The clutch 02 is used to control the connection or disconnection of the torque transmitted from the input shaft 1 to the rotor 16 of the first screw motor 01.

[0026] Its working principle or implementation method is that when the drill bit at the front end of the coiled tubing needs to drill at a specified angle, the automatic on-off switch 04 can be used to control the first screw motor 01 to not take in fluid or rotate, and the high-pressure well fluid flows directly to the screw motor at the bend of the front end of the coiled tubing to control the rotation of the drill bit. At this time, the front end of the coiled tubing does not rotate, and stops at any angle within the rotation plane of its front end. At the same time, the automatic on-off switch 04 drives the clutch 02 to close. During the clutching process, the reset device resets the front end of the coiled tubing that stops at any angle within the rotation plane to the initial angle. Then, according to the difference between the initial angle and the required directional angle, the angle adjustment value of the electric-controlled directional device is set. According to the adjustment value, the input shaft 1 is controlled to rotate to the required angle according to the adjustment value of the electric-controlled directional device, and the input shaft 1 is turned. The power at the end is transmitted to the first screw motor 01, and the first screw motor 01 transmits the power to the front end of the coiled tubing, so that after the front end rotates to the required directional adjustment angle, the second screw motor at the bend angle of the front end of the coiled tubing performs directional sliding drilling. When directional sliding drilling is not required, the kinetic energy of the high-pressure well fluid is converted into the rotational torque of the rotor 16 by the first screw motor 01, thereby driving the coiled tubing to rotate. In cooperation with the second screw motor at the bend angle of the front end of the coiled tubing, the drill bit itself is rotated by the screw motor at the bend angle of the front end of the coiled tubing, and rotates with the front end of the coiled tubing at the same time. The front end of the coiled tubing rotates while drilling, so that the coiled tubing drilling can achieve stable switching between directional drilling and reversing drilling in the well, and complete dynamic switching of drilling modes during the drilling process.

[0027] According to the above working principle, some preferred implementation structures or implementation methods are provided, such as Figure 1 As shown, the automatic opening and closing switch 04 includes a discharge channel 14, an inlet channel 20, a diverter valve head 13, a connecting rod 10 and an automatic telescopic rod 3, the clutch 02 includes a clutch housing 6, an upper spline sleeve 4, a spline transmission shaft 5 and a lower spline sleeve 7, the reset device includes a spiral guide sleeve 8, a sliding pin 9 and an angle sensor, one end of the inlet channel 20 is used to communicate with the liquid inlet channel of the first screw motor 01, and the other end is rotatably connected to the clutch housing 6 and connected to the lower spline sleeve 7 for inputting liquid, one end of the discharge channel 14 is connected to the inlet channel 20 through the diverter valve head 13, and the other end is connected to the liquid inlet of the continuous pipe, and the diverter valve head 13 is connected to the inlet channel 2 through the connecting rod 10. 0, the connecting rod 10 is connected to the telescopic end of the automatic telescopic rod 3 through the spline transmission shaft 5, the fixed end of the automatic telescopic rod 3 is fixedly connected to the input shaft 1, the upper end of the spline transmission shaft 5 is slidably connected in the upper spline sleeve 4, and the lower end of the spline transmission shaft 5 is slidably connected in the lower spline sleeve 7. The upper spline sleeve 4 and the lower spline sleeve 7 are respectively connected to the input shaft 1 and the inlet channel 20. A spiral guide sleeve 8 is provided in the lower spline sleeve 7, and a sliding pin 9 is provided on the spline transmission shaft 5. The sliding pin 9 is slidably connected to the spiral guide sleeve 8. An angle sensor is provided at the end of the input shaft 1. The angle sensor determines the rotation angle of the input shaft 1 according to the sliding distance of the sliding pin 9 on the spiral surface of the spiral guide sleeve 8.

[0028] The automatic telescopic rod 3 can adopt a common oil cylinder structure. The inlet channel 20 and the discharge channel 14 can use a hollow shaft as the channel. A through hole is opened in the shaft wall of the hollow shaft to communicate with the channel outside the central shaft. The channel inside the central shaft is blocked by the diverter valve head 13. In this way, the discharge channel 14 and the inlet channel 20 can be formed inside and outside the hollow shaft respectively. It should be appreciated by those skilled in the art that it is not necessary to use a hollow shaft to form the above-mentioned discharge channel 14 and inlet channel 20. It can also be achieved by using a multi-channel shaft. This will not be described in detail here.

[0029] like Figure 3 As shown, the spiral guide sleeve 8 includes a spiral track 8a and a straight groove track 8b. The straight groove track 8b is connected to the spiral track 8a. The sliding pin 9 can slide along the spiral track 8a into the straight groove track 8b to drive the spline transmission shaft 5 to spirally rise.

[0030] like Figure 1 As shown, a centralizer 12 is connected to the outside of the connecting rod 10 , and the connecting rod 10 is slidably connected to the inner wall of the inlet channel 20 through the centralizer 12 .

[0031] The outer ring of the centralizer 12 is provided with an elastic centralizing belt, which is used to reduce the vibration amplitude of the connecting rod 10.

[0032] The other end of the inlet channel 20 is connected to the clutch 02 through the upper transmission shaft assembly 11. The upper transmission shaft assembly 11 is used for the rotation of the inlet channel 20 and the communication of the inlet channel 20.

[0033] The upper transmission shaft assembly 11 includes a bearing and a rotating shaft. The outer ring of the rotating shaft is rotatably connected to the clutch housing 6 through the bearing, and the two ends are used to transmit torque between the inlet channel 20 and the lower spline sleeve 7 respectively.

[0034] The rotor 16 of the first screw motor 01 has a hollow shaft cavity. The rotor 16 is driven to rotate on the stator 17 by the high-pressure fluid input into the liquid inlet channel. The stator 17 is connected to the clutch housing 6 through the upper transmission shaft assembly 11. The hollow shaft cavity is connected to the leakage channel 14, which facilitates the separation of leakage and inlet at the rotor.

[0035] The fixed end of the automatic telescopic rod 3 is rotatably connected to the conveyor shaft through the bearing seat 2. The upper part of the automatic telescopic rod 3 has a threaded structure, which is installed with the bearing seat 2. The bearing seat 2 and the external threaded end surface of the upper spline sleeve 4 form a positioning effect, further preventing the automatic telescopic rod 3 from falling off and facilitating its rotation.

[0036] One end of the first screw motor 01 is connected to the clutch 02 via the upper transition joint 15 and the upper transmission shaft assembly 11, and the other end is connected to the coiled tubing via the lower transition joint 18 and the lower transmission shaft assembly 19, making modular replacement easy.

[0037] The specific connection method can be as follows: the upper end of the input shaft 1 is connected to the electrically controlled coiled tubing direction finder, and the lower end is threadedly connected to the upper splined sleeve 4. The fixed end of the automatic telescopic rod 3 has a threaded structure and is connected to the hole in the upper splined sleeve 4. The upper end of the fixed end of the automatic telescopic rod 3 is threadedly connected to the internal bearing of the bearing seat 2. The splined drive shaft 5 is threadedly connected to the piston rod of the automatic telescopic rod 3, i.e., the telescopic end. One end of the upper splined sleeve 4 has an internal spline structure that is constantly engaged with the splined drive shaft 5. The lower splined sleeve 7 is threadedly connected to the upper drive shaft assembly 11. The splined drive shaft 5 and the lower splined sleeve 7 are engaged and disengaged via locally provided spline teeth. The connecting rod 10 is threadedly connected to the splined drive shaft 5. The clutch housing 6 is threadedly connected to the upper drive shaft assembly 11. The centralizer 12 is mounted on the connecting rod 10, and the diverter valve head 13 is threadedly connected to the connecting rod 10. The upper drive shaft assembly 11 is threadedly connected to the upper transition joint 15. One section of the discharge channel 14 is threadedly connected to the inlet channel 20 using a hollow shaft. The inlet channel 20 is connected to the lower end of the lower splined sleeve 7 via the inner rotating shaft of the upper transmission shaft assembly 11. The other section of the discharge channel 14 is threadedly connected to the lower transmission shaft assembly 19 using a hollow shaft. The two hollow shaft sections are threadedly connected to the upper and lower ends of the rotor 16. The upper transition joint 15 is threadedly connected to the stator 17. The rotor 16 and stator 17 cooperate to form the first screw motor 01. The stator 17 is threadedly connected to the lower transition joint 18, which is also threadedly connected to the lower transmission shaft assembly 19.

[0038] The spline drive shaft 5 is capable of linear reciprocating motion under the action of the piston rod of the automatic telescopic rod 3. The lower end surface of the upper spline sleeve 4 and the upper end surface of the lower spline sleeve 7 mate with the steps provided on the spline drive shaft 5. When the spline drive shaft 5 reciprocates linearly, the ends of the shoulder of these components contact the end surfaces of the upper spline sleeve 4 and the lower spline sleeve 7, respectively, forming two stop points for the linear reciprocating motion, halting the spline drive shaft 5 and thus limiting its displacement.

[0039] The spiral guide sleeve 8 is installed in the center hole of the lower spline sleeve 7. The two parts are transitionally matched, and metal adhesive is applied to the transition surface. The two parts are circumferentially positioned using positioning bosses and positioning grooves. One end of the spiral guide sleeve 8 is a spiral and straight groove structure. When the spline drive shaft 5 moves upward, it rotates along the spiral track 8a surface under the action of the sliding pin 9 until it stops on the straight groove track 8b surface. At this time, the angle of rotation of the homing pin along the spiral surface is recorded as the initial angle of the spiral guide sleeve 8. The sliding pin 9 then enters the straight groove track to lock this angle. Because the spiral guide sleeve 8 is connected to the front end of the coiled tubing through the inlet channel 20, the outlet channel, and the rotor, it also corresponds to the initial angle of the front end of the coiled tubing within the rotating surface. The difference between the required orientation angle and the initial angle is the angle that the electronically controlled direction finder needs to adjust.

[0040] Both ends of the lower spline key of the spline transmission shaft 5 and both ends of the keyway of the lower spline sleeve 7 are designed with guide angles. The two guide angles cooperate to ensure smooth engagement of the inner and outer splines in the separated state without jamming.

[0041] Connecting rod 10, centralizer 12, and diverter valve head 13 follow the splined drive shaft 5 in linear reciprocating motion. The outer wall of centralizer 12 mates with the inner wall of inlet channel 20, keeping connecting rod 10 and diverter valve head 13 vertical at all times. Elastic centralizing straps are installed on the outer wall of centralizer 12 to eliminate vibrations experienced by the entire switching device during operation.

[0042] Those skilled in the art should be able to imagine that the rotor 16, the lower transmission shaft assembly 19, the drainage channel 14, the upper transmission shaft assembly 11, etc. all have a central hole to form a drilling fluid flow channel.

[0043] When the automatic telescopic rod 3 is in a fully extended state, the conical surface of the diverter valve head 13 fits into the conical surface of the orifice of the leakage channel 14, closing the water circulation channel of the leakage channel 14; when the automatic telescopic rod 3 is in a fully retracted state, the conical surface of the diverter valve head 13 separates from the conical surface of the orifice of the leakage channel 14, opening the water circulation channel of the leakage channel 14.

[0044] The surfaces of the connecting rod 10 and the diverter valve head 13 are sprayed with tungsten carbide to improve their erosion resistance and corrosion resistance.

[0045] The lower end of the lower transmission shaft assembly 19 is connected to a second screw motor for conventional coiled tubing.

[0046] Dynamic switching drilling mode switching device for coiled tubing drilling Figure 1 , when it is in the initial state, the spline fit is as follows Figure 2 In the partial schematic diagram at point A, the upper spline sleeve 4 has an internal spline 4a, the spline transmission shaft 5 has an upper external spline 5a, and the two splines are meshed; the lower spline sleeve 7 has an internal spline 7a, the spline transmission shaft 5 has a lower external spline 5b, and the two splines are separated; the spline transmission shaft 5 has a shoulder lower end face 5c, and the lower spline sleeve 7 has an upper end face 7b, and the two end faces fit together to form the dead point where the piston 3 extends. At this time, the connection between the discharge channel and the inlet channel 20 is switched as shown in FIG. Figure 4 In the partial schematic diagram at center C, diverter valve head 13 has a tapered surface 13a, drain channel 14 has a tapered hole 14a, and inlet channel 20 has a hole 11a. The distance between tapered surface 13a and hole 14a is less than 0.5 mm, effectively closing the drilling fluid flow path within drain channel 14. This allows the drilling fluid to flow out through hole 11a and into the screw motor composed of rotor 16 and stator 17, driving the screw motor. The screw motor drives rotor 16 of lower drive shaft assembly 19, which in turn drives the coiled tubing screw motor connected at the lower end. This achieves dynamic downhole rotation of the coiled tubing screw motor, enabling stable inclination drilling.

[0047] When switching from steady-angle drilling to directional drilling, Figure 2 Partial schematic diagram at point B in the middle. The automatic telescopic rod 3 contracts, causing the spline drive shaft 5 to move upward. When the spline drive shaft 5 moves upward, the sliding pin 9 slides along the spiral surface of the spiral guide sleeve 8, driving the spline drive shaft 5 to rotate while moving upward. As the sliding pin 9 enters the straight groove track 8b, the spline drive shaft 5 no longer rotates, but continues to move upward, causing the inner spline 7a to engage with the outer spline 5b. The spline drive shaft 5 has an upper end face 5d of the shoulder, and the upper spline sleeve 4 has a lower end face 4b. The two end faces fit together to form a dead point where the piston 3 is shortened, and the piston 3 stops moving. Since the length of the outer spline 5a is greater than the stroke of the automatic telescopic rod 3, the inner spline 4a is still engaged with the outer spline 5a. At this time, the connection between the discharge channel and the inlet channel 20 is switched as shown in FIG. Figure 4 In the partial schematic diagram at point D, conical surface 13a is completely separated from conical hole 14a, drain channel 14 is unobstructed, and drilling fluid changes its flow path, flowing through drain channel 14. Rotor 16 then stops operating. The coiled tubing directional control then rotates according to ground commands, driving input shaft 1. Input shaft 1, through threads and splines, drives various components. Rotor 16 in lower drive shaft assembly 19 drives the connected coiled tubing screw drill bit to the specified angle. Once the desired drilling surface is reached, the second screw motor in the coiled tubing continues to rotate, achieving directional drilling.

[0048] Those skilled in the art should be able to imagine that the connection method and shape of the above-mentioned parts can be slightly changed, such as changing the threaded connection to another type of fixed connection, changing the single-channel hollow shaft to a multi-channel hollow shaft and changing the connection method of internal and external splines to a connection method of external and internal splines, etc., and the switching device can also be used to realize the dynamic switching function of the drilling mode, which will not be elaborated one by one.

[0049] With respect to the above specific example, those skilled in the art should be able to appreciate that the input shaft, automatic on / off switch 04, detection element 03, first screw motor 01, electronically controlled orienter, and input shaft may also be designed to match existing structures. For example, the detection element 03 may also employ a Hall sensor to monitor the angle of a mark on the coiled tubing connected to the rotating structure, similar to the working principle of the engine crankshaft position detection element 03. Furthermore, the mark may not necessarily be measured at the spiral guide sleeve 8. Alternatively, the spiral guide sleeve 8 may be provided at the upper transmission shaft assembly, and a sliding pin 9 may be provided on the connecting rod 10. This allows for the difference between the actual rotation angle of the coiled tubing and the desired orientation angle to be determined, thereby enabling angle adjustment via the electronically controlled orienter. The electronically controlled orienter employs a servo motor as the power element for angle adjustment, and the like, which will not be elaborated on in detail.

[0050] It should be noted that the terms "first", "second" etc. in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the application described herein. In this application, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "center", "vertical", "horizontal", "lateral", "longitudinal" etc. are based on the directions or positional relationships shown in the accompanying drawings.

[0051] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0052] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A drilling mode dynamic switching device for coiled tubing drilling, characterized in that: The invention comprises a first screw motor, wherein one end of the rotor of the first screw motor is connected to the coiled tubing for driving the coiled tubing to rotate, and the other end is connected to one end of a clutch. The other end is provided with a detection element for monitoring the rotational position of the coiled tubing. An automatic on-off switch is connected to the liquid inlet channel of the first screw motor. The automatic on-off switch is used to control the closing or opening of the liquid inlet channel of the first screw motor. The other end of the clutch is connected to an electrically controlled direction-controller via an input shaft. The other end of the clutch is controlled by the driving closing end of the automatic on-off switch. The electrically controlled direction-controller is used to adjust the rotational angle of the input shaft. The clutch is used to control the connection or disconnection of the rotor torque transmitted by the input shaft to the first screw motor. The automatic opening and closing switch drives the clutch to close. During the clutching process, the reset device resets the front end of the coiled tubing that stops at any angle within the rotation plane to the initial angle. Then, based on the difference between the initial angle and the required orientation angle, the angle adjustment value of the electronically controlled orienter is set. Based on the adjustment value, the input shaft is controlled to rotate to the required angle according to the adjustment value of the electronically controlled orienter. The automatic opening and closing switch includes a discharge channel, an inlet channel, a diverter valve head, a connecting rod and an automatic telescopic rod. The clutch includes a clutch housing, an upper spline sleeve, a spline transmission shaft and a lower spline sleeve. The reset device includes a spiral guide sleeve, a sliding pin and an angle sensor. One end of the inlet channel is used to communicate with the liquid inlet channel of the first screw motor, and the other end is rotatably connected to the clutch housing and connected to the lower spline sleeve for inputting liquid. One end of the discharge channel is connected to the inlet channel through the diverter valve head, and the other end is connected to the liquid inlet of the continuous tube. The diverter valve head is connected to the inlet channel through a connecting rod. The connecting rod is connected to the inlet channel through a spline transmission shaft. The dynamic shaft is connected to the telescopic end of the automatic telescopic rod, the fixed end of the automatic telescopic rod is fixedly connected to the input shaft, the upper end of the spline transmission shaft is slidably connected to the upper spline sleeve, and the lower end of the spline transmission shaft is slidably connected to the lower spline sleeve. The upper spline sleeve and the lower spline sleeve are respectively connected to the input shaft and the inlet channel. The spiral guide sleeve is provided in the lower spline sleeve, and a sliding pin is provided on the spline transmission shaft. The sliding pin is slidably connected to the spiral guide sleeve. The angle sensor is provided at the end of the input shaft, and the angle sensor determines the rotation angle of the input shaft according to the sliding distance of the sliding pin on the spiral surface of the spiral guide sleeve. The rotor of the first screw motor has a hollow shaft cavity, and the rotor is driven to rotate on the stator by the high-pressure fluid input through the liquid inlet channel. The stator is connected to the clutch housing through the upper transmission shaft assembly, and the hollow shaft cavity is connected to the drain channel; The diverter valve head has a conical surface, the discharge channel has a conical hole, and the inlet channel has a hole. The drilling fluid flow path in the discharge channel hole is closed, so that the drilling fluid flows out through the hole and enters the screw motor composed of the rotor and the stator.

2. The drilling mode dynamic switching device for coiled tubing drilling according to claim 1, characterized in that: The spiral guide sleeve includes a spiral track and a straight groove track, the straight groove track is connected to the spiral track, and the sliding pin can slide along the spiral track into the straight groove track to drive the spline transmission shaft to spirally rise.

3. The drilling mode dynamic switching device for coiled tubing drilling according to claim 1, characterized in that: The connecting rod is externally connected to a centralizer, and the connecting rod is slidably connected to the inner wall of the inlet channel through the centralizer.

4. The drilling mode dynamic switching device for coiled tubing drilling according to claim 3, characterized in that: The outer ring of the centralizer is provided with an elastic centralizing belt, and the elastic centralizing belt is used to reduce the vibration amplitude at the connecting rod.

5. The drilling mode dynamic switching device for coiled tubing drilling according to claim 1, characterized in that: The other end of the inlet channel is connected to the clutch through an upper transmission shaft assembly, and the upper transmission shaft assembly is used for the rotation of the inlet channel and the communication of the inlet channel.

6. The drilling mode dynamic switching device for coiled tubing drilling according to claim 5, characterized in that: The upper transmission shaft assembly includes a bearing and a rotating shaft. The outer ring of the rotating shaft is rotatably connected to the clutch housing through the bearing, and the two ends are respectively used to transmit torque between the inlet channel and the lower spline sleeve.

7. The drilling mode dynamic switching device for coiled tubing drilling according to claim 1, characterized in that: The fixed end of the automatic telescopic rod is rotatably connected to the conveying shaft through a bearing seat.

8. A drilling mode dynamic switching device for coiled tubing drilling according to any one of claims 1 to 7, characterized in that: One end of the first screw motor is connected to the clutch through an upper transition joint and an upper transmission shaft assembly in sequence, and the other end is connected to the coiled tubing through a lower transition joint and a lower transmission shaft assembly in sequence.

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