Drilling mode dynamic switching device for coiled tubing drilling

Abstract

The invention relates to the field of coiled tubing drilling control equipment, and particularly discloses a drilling mode dynamic switching device for coiled tubing drilling, which comprises a first screw motor, one end of a rotor of the first screw motor is connected to a coiled tubing, and the other end of the rotor of the first screw motor is connected with one end of a clutch; one end of the clutch is connected to the first screw motor, the other end of the clutch is provided with a detection element used for monitoring the rotating position of the coiled tubing, an automatic on-off switch is connected to a liquid inlet channel of the first screw motor and used for controlling closing or opening of the liquid inlet channel of the first screw motor, and the other end of the clutch is connected to the electric control orientator through an input shaft. The other end of the clutch controls the clutch to be disengaged and engaged through the driving closing end of the automatic on-off switch, the electric control orientator is used for adjusting the rotation angle of the input shaft, and the clutch is used for controlling connection or disconnection of rotor torque transmitted to the first screw motor by the input shaft. The device can solve the problem that stable switching of directional drilling and reversing drilling cannot be achieved underground 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] Under the conditions of low oil prices, long drilling cycles and increased drilling costs, major oil fields are increasingly developing small-hole drilling, sidetracking old wells, and reducing costs and increasing efficiency. Coiled tubing drilling technology has gradually gained favor from major oil fields due to its advantages such as small footprint, suitability for small-hole drilling, re-drilling of old wells, safe underbalanced drilling, shortened drilling cycles, reduced operating personnel, and reduced drilling costs. Compared with traditional drill pipe drilling, coiled tubing drilling does not require single-rod connection, which can shorten the time of tripping and drilling. When re-drilling old wells (deepening drilling or sidetracking), due to the small diameter of the coiled tubing, tubing operations can be carried out without removing the existing production equipment in the old well, thereby achieving production while drilling and significantly saving costs. The coiled tubing has a built-in cable that can transmit logging while drilling data in real time, and supports issuing commands to achieve upload and download functions.

[0003] When the coiled tubing is used for directional wells, horizontal wells, and sidetracking operations, the borehole trajectory needs to be adjusted. To achieve the effect of adjusting the borehole 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, it is necessary to pull out the drill and replace the screw drill bit. Frequent pulling out of the drill 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 patent of the present invention designs a dynamic switching drilling mode device for coiled tubing drilling, which realizes the downhole switching between directional drilling and steady-angle drilling, and can adjust the directional angle in real time to reduce the number of pulling out of the drill. Summary of the invention

[0004] The purpose of the present invention is to provide a drilling mode dynamic switching device for coiled tubing drilling to solve the problem that coiled tubing drilling cannot achieve stable switching of directional and reversing drilling in the well. The purpose of the present invention can be achieved by the following technical solutions:

[0005] A drilling mode dynamic switching device for coiled tubing drilling comprises a first screw motor, wherein one end of a 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, and a detection element for monitoring the rotation position of the coiled tubing is provided on the other end, an automatic on-off switch is connected to a liquid inlet channel of the first screw motor, and 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 electric control direction device through an input shaft, and the other end of the clutch controls the clutch through the driving closing end of the automatic on-off switch, the electric control direction device is used to adjust the rotation angle of the input shaft, and the clutch is used to control the connection or disconnection of the rotor torque transmitted from 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. A 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 in the upper spline sleeve, and the lower end of the spline transmission shaft is slidably connected in 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 arranged in the lower spline sleeve, and a sliding pin is arranged on the spline transmission shaft. The sliding pin is slidably connected to the spiral guide sleeve. The angle sensor is arranged 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 continuous pipe through a lower transition joint and a lower transmission shaft assembly in sequence.

[0015] Beneficial effects of the present invention:

[0016] The device can realize the function of switching the drilling mode of coiled tubing drilling: adjust the bending angle of the second screw motor at the coiled tubing, that is, the drill bit at the front end of the coiled tubing to a specified angle for sliding directional drilling, or make the second screw motor tool bending angle, that is, the drill bit at the front end of the coiled tubing, rotate dynamically to perform stable inclination drilling (stable oblique angle drilling), and realize dual-function dynamic switching. The structure can flexibly switch the drilling mode without the need to replace the screw motor during drilling, which not only improves the efficiency of coiled tubing operations and extends the life of coiled tubing, but also improves the ability to control complex wellbore trajectories, providing a broader development space 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 briefly introduces 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 creative work.

[0019] Figure 1 It is a schematic diagram of a dynamic switching drilling mode switching device for coiled tubing drilling in an embodiment of the present invention;

[0020] Figure 2A schematic diagram of a clutch engagement and disengagement state in 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 on-off switch in an embodiment of the present invention;

[0023] In the figure: 1, input shaft; 2, bearing seat; 3, automatic telescopic rod; 4, upper spline sleeve; 4a, inner spline at upper spline sleeve; 4b, lower end face of upper spline sleeve; 5, spline transmission shaft; 5a, outer spline at spline transmission shaft; 5b, outer spline at spline transmission shaft; 5c, lower end face of shaft shoulder; 5d, upper end face of shaft shoulder; 6, clutch housing; 7, lower spline sleeve; 7a, inner spline at lower spline sleeve; 7b, upper end face of lower spline sleeve surface; 8, spiral guide sleeve; 8a, spiral track; 8b, straight groove track; 9, sliding pin; 10, connecting rod; 11, upper transmission 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 transmission shaft assembly; 20, inlet channel; 11a, hole. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, a drilling mode dynamic switching device for coiled tubing drilling includes a first screw motor 01, one end of a 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, and the other end is provided with a detection element 03 for monitoring the rotation 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 the automatic on-off switch 04 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 electric control direction device through the input shaft 1, and the other end of the clutch 02 controls the clutch 02 to be engaged or disengaged through the driving closing end of the automatic on-off switch 04, the electric control direction device is used to adjust the rotation angle of the input shaft 1, and the clutch 02 is used to control the connection or disconnection of the torque of the rotor 16 transmitted from the input shaft 1 to 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 not to take in fluid and not to rotate, and the high-pressure well fluid directly flows 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 surface 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 front end of the coiled tubing stopped at an angle within any rotation surface is reset to the initial angle through the reset device, and then the angle adjustment value of the electric-controlled directional device is set according to the difference between the initial angle and the required directional angle. 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 rotated to the required angle. The power at the first screw motor 01 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, so as to drive the coiled tubing to rotate, and cooperate with the second screw motor at the bend angle of the front end of the coiled tubing, so that the drill bit itself can be rotated by the screw motor at the bend angle of the front end of the coiled tubing, and rotate 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 the dynamic switching of the drilling mode 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 on-off 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, 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 arranged in the lower spline sleeve 7, a sliding pin 9 is arranged on the spline transmission shaft 5, the sliding pin 9 is slidably connected to the spiral guide sleeve 8, an angle sensor is arranged at the end of the input shaft 1, and 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 use a common oil cylinder structure, the inlet channel 20 and the discharge channel 14 can use a hollow shaft as a channel, a through hole is opened on the shaft wall of the hollow shaft to communicate with the outer channel of the middle hole shaft, and the inner channel of the middle hole shaft is blocked by the diverter valve head 13, so that the discharge channel 14 and the inlet channel 20 can be formed inside and outside the hollow shaft respectively. Those skilled in the art should be able to think that it is not necessary to use a hollow shaft to form the above-mentioned discharge channel 14 and inlet channel 20, and it can also be achieved by a multi-channel shaft, which will not be described one by one 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 externally connected to 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 at 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 , and 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 respectively used to transmit torque between the inlet channel 20 and the lower spline sleeve 7.

[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 conveying shaft through the bearing seat 2. The upper part of the automatic telescopic rod 3 has a threaded structure, and the bearing seat 2 is installed. The bearing seat 2 and the external thread end face of the upper spline sleeve 4 form a positioning effect, which further prevents the automatic telescopic rod 3 from falling off and facilitates its rotation.

[0036] One end of the first screw motor 01 is connected to the clutch 02 through the upper transition joint 15 and the upper transmission shaft assembly 11, and the other end is connected to the coiled tube through the lower transition joint 18 and the lower transmission shaft assembly 19, so as to facilitate modular replacement.

[0037] The specific connection method can be that the upper end of the input shaft 1 is connected to the electric control director for the continuous pipe, and the lower end is connected to the upper spline sleeve 4 through a thread. The fixed end of the automatic telescopic rod 3 has a threaded structure and is connected to the hole of the upper spline sleeve 4. The upper end of the fixed end of the automatic telescopic rod 3 is connected to the inner bearing of the bearing seat 2 through a thread. The spline transmission shaft 5 is connected to the piston rod of the automatic telescopic rod 3, that is, the telescopic end, through a thread. One end of the upper spline sleeve 4 is an internal spline structure, which is always engaged with the spline transmission shaft 5. The lower spline sleeve 7 is connected to the upper transmission shaft assembly 11 through a thread. The spline transmission shaft 5 and the lower spline sleeve 7 are engaged or separated by locally arranged spline teeth. The connecting rod 10 is connected to the spline transmission shaft 5 through a thread. The clutch housing 6 is connected to the upper transmission shaft assembly 11 through a thread. The centralizer 12 is installed on the connecting rod 10, and the diverter valve head 13 is connected to the connecting rod 10 through a thread. The upper transmission shaft assembly 11 is connected to the upper transition joint 15 through a thread. One section of the discharge channel 14 is connected to the inlet channel 20 by a hollow shaft through a thread, and the inlet channel 20 is connected to the lower end of the lower spline sleeve 7 through the inner rotating shaft of the upper transmission shaft assembly 11; the other section of the discharge channel 14 is connected to the lower transmission shaft assembly 19 by a hollow shaft through a thread. The two sections of the hollow shaft are connected to the upper and lower ends of the rotor 16 through a thread. The upper transition joint 15 is connected to the stator 17 through a thread. The rotor 16 and the stator 17 cooperate to form the first screw motor 01. The stator 17 is connected to the lower transition joint 18 through a thread, and the lower transition joint 18 is also connected to the lower transmission shaft assembly 19 through a thread.

[0038] The spline transmission shaft 5 can make 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 can cooperate with the step set on the spline transmission shaft 5. When the spline transmission shaft 5 makes linear reciprocating motion, the two ends of the shaft shoulder of the part will contact the end surface of the upper spline sleeve 4 and the lower spline sleeve 7 respectively, forming two stop points of the linear reciprocating motion, so that the spline transmission shaft 5 stops moving further, so as to achieve the effect of limiting the displacement of the spline transmission shaft 5.

[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 on the transition surface. The two parts are circumferentially positioned by positioning bosses and positioning grooves. One end of the spiral guide sleeve 8 is a spiral and straight groove structure, so that when the spline transmission shaft 5 moves upward, under the action of the sliding pin 9, it rotates along the spiral track 8a surface to the straight groove track 8b surface and stops. At this time, the angle of rotation of the return pin along the spiral surface can be recorded as the initial angle of the spiral guide sleeve 8, and then the sliding pin 9 enters the straight groove track to lock the angle. Because the spiral guide sleeve 8 is connected to the front end of the continuous tube through the inlet channel 20, the discharge channel and the rotor, it is also equivalent to the initial angle of the front end of the continuous tube in the rotating surface. Then, the difference between the angle required for orientation and the initial angle is the angle that the electric control orienter 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 make the inner and outer splines in the separated state mesh smoothly without jamming.

[0041] The connecting rod 10, the centralizer 12 and the diverter valve head 13 follow the spline transmission shaft 5 to make linear reciprocating motion. The outer wall of the centralizer 12 cooperates with the inner wall of the inlet channel 20 to keep the connecting rod 10 and the diverter valve head 13 in a vertical state. An elastic centralizing belt is installed on the outer wall of the centralizer 12 to eliminate the vibration of 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 leakage 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 with the conical surface of the orifice of the leakage channel 14, closing the water eye 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 eye 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 and corrosion resistance.

[0045] The lower end of the lower transmission shaft assembly 19 is connected to a conventional second screw motor for 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 A in the middle, the upper spline sleeve 4 has an inner spline 4a, the spline transmission shaft 5 has an upper outer spline 5a, and the two splines are meshed; the lower spline sleeve 7 has an inner spline 7a, the spline transmission shaft 5 has a lower outer 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 a dead point where the piston 3 is extended. 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 C in the middle, the diverter valve head 13 has a conical surface 13a, the discharge channel 14 has a conical hole 14a, and the inlet channel 20 has a hole 11a. The distance between the conical surface 13a and the conical hole 14a is less than 0.5 mm, that is, the drilling fluid flow channel in the hole of the discharge channel 14 is closed, so that the drilling fluid flows out through the hole 11a and enters the screw motor composed of the rotor 16 and the stator 17 to drive the screw motor to work. The screw motor drives the rotor 16 of the lower transmission shaft assembly 19 to rotate, driving the screw motor for the coiled tubing connected at the lower end to rotate, realizing the dynamic rotation effect of the screw motor for the coiled tubing downhole, and achieving the function of 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 D in the middle, the conical surface 13a and the conical hole 14a are completely separated, the drainage channel 14 hole is unobstructed, the drilling fluid changes the flow path and flows through the drainage channel 14 hole, and the rotor 16 stops working. Then the coiled tubing directional device rotates according to the ground command, driving the input shaft 1 to rotate, and the input shaft 1 drives various components to rotate through the threads and splines, so that the rotor 16 in the lower transmission shaft assembly 19 drives the coiled tubing screw drill bit connected at the lower part to rotate to a specified angle. After reaching the predetermined drilling surface, the second screw motor at the coiled tubing continues to rotate to achieve the effect of 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 implemented to realize the dynamic switching function of the drilling mode, which will not be elaborated one by one.

[0049] For the above specific examples, those skilled in the art should be able to imagine that the input shaft, the automatic on-off switch 04, the detection element 03, the first screw motor 01, the electronically controlled orienter, and the input shaft can also be designed to match the existing structure. For example, the detection element 03 can also use a Hall sensor to monitor the angle of the mark on the continuous tube connected to the rotating structure, which is similar to the working principle of the engine crankshaft position detection element 03. In addition, the mark may not necessarily be measured at the spiral guide sleeve 8. The spiral guide sleeve 8 may also be provided at the upper transmission shaft assembly, and the sliding pin 9 may be provided on the connecting rod 10, so as to obtain the difference between the actual rotation angle of the continuous tube and the required orientation angle, so as to adjust the angle through the electronically controlled orienter. The electronically controlled orienter uses a servo motor as the angle adjustment power element, etc., which are not described in detail.

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

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A drilling mode dynamic switching device for coiled tubing drilling, characterized in that: The invention comprises a first screw motor (01), wherein one end of a rotor (16) of the first screw motor (01) is connected to the coiled tube for driving the coiled tube to rotate, and the other end is connected to one end of a clutch (02), and a detection element (03) for monitoring the rotation position of the coiled tube is provided on the other end; an automatic on-off switch (04) is connected to the liquid inlet channel of the first screw motor (01), and the automatic on-off switch (04) 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 an electric control direction device through an input shaft (1), and the other end of the clutch (02) controls the clutch (02) to engage or disengage through the driving closing end of the automatic on-off switch (04); the electric control direction device is used to adjust the rotation angle of the input shaft (1), and 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).

2. The drilling mode dynamic switching device for coiled tubing drilling according to claim 1, characterized in that: The automatic opening and closing switch (04) comprises 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) comprises a clutch housing (6), an upper spline sleeve (4), a spline transmission shaft (5) and a lower spline sleeve (7); the reset device comprises 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); 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 tube; the diverter valve head (13) is connected to the inlet channel (20) through the connecting rod (10); The rod (10) is connected to the telescopic end of the automatic telescopic rod (3) through a 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 to the upper spline sleeve (4); the lower end of the spline transmission shaft (5) is slidably connected to 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); the spiral guide sleeve (8) is arranged in the lower spline sleeve (7); a sliding pin (9) is arranged on the spline transmission shaft (5); the sliding pin (9) is slidably connected to the spiral guide sleeve (8); the angle sensor is arranged 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).

3. The drilling mode dynamic switching device for coiled tubing drilling according to claim 2, characterized in that: The spiral guide sleeve (8) comprises a spiral track (8a) and a straight groove track (8b), the straight groove track (8b) is connected to the spiral track (8a), and 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.

4. The drilling mode dynamic switching device for coiled tubing drilling according to claim 2, characterized in that: The connecting rod (10) is externally connected to a centralizer (12), and the connecting rod (10) is slidably connected to the inner wall of the inlet channel (20) via the centralizer (12).

5. The drilling mode dynamic switching device for coiled tubing drilling according to claim 4, characterized in that: The outer ring of the centralizer (12) is provided with an elastic centralizing belt, and the elastic centralizing belt is used to reduce the vibration amplitude at the connecting rod (10).

6. The drilling mode dynamic switching device for coiled tubing drilling according to claim 2, characterized in that: The other end of the inlet channel (20) is connected to the clutch (02) via an upper transmission shaft assembly (11), and the upper transmission shaft assembly (11) is used for the rotation of the inlet channel (20) and the communication of the inlet channel (20).

7. The drilling mode dynamic switching device for coiled tubing drilling according to claim 6, characterized in that: The upper transmission shaft assembly (11) comprises a bearing and a rotating shaft. The outer ring of the rotating shaft is rotatably connected to the clutch housing (6) via the bearing, and the two ends are respectively used to transmit torque between the inlet channel (20) and the lower spline sleeve (7).

8. The drilling mode dynamic switching device for coiled tubing drilling according to claim 2, characterized in that: 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).

9. The drilling mode dynamic switching device for coiled tubing drilling according to claim 2, characterized in that: The fixed end of the automatic telescopic rod (3) is rotatably connected to the conveying shaft via a bearing seat (2).

10. A drilling mode dynamic switching device for coiled tubing drilling according to any one of claims 1 to 9, characterized in that: One end of the first screw motor (01) is connected to the clutch (02) through an upper transition joint (15) and an upper transmission shaft assembly (11) in sequence, and the other end is connected to the continuous pipe through a lower transition joint (18) and a lower transmission shaft assembly (19) in sequence.

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