Continuous deflecting wire-line coring drilling tool and method for directional drilling

Abstract

The invention discloses a continuous deflecting wire-line coring drilling tool and method for directional drilling, relates to the field of drilling of soil layers or rocks, and solves the problems that an existing drilling device is high in deflecting direction control difficulty and low in core recovery rate. According to the technical scheme, the continuous deflecting wire-line coring drilling tool for directional drilling comprises a deflecting drill rod, a hollow motor and a drill bit, the deflecting drill rod comprises a spring pipe, an upper connector pipe and a lower connector pipe, the upper connector pipe and the lower connector pipe are arranged at the two ends of the spring pipe, and the deflecting drill rod is divided into two sections including the first deflecting drill rod and the second deflecting drill rod; the first deflecting drill rod, the second deflecting drill rod, the hollow motor and the drill bit are sequentially connected in series to form a coring cavity; an installation groove is formed in the outer side of the lower connector pipe of the first deflecting drill rod and / or the outer side of the upper connector pipe of the second deflecting drill rod, a deflecting motor and an ejection device are installed in the installation groove, and the ejection device can eject and push the hole wall of a drilled hole, so that the two sections of deflecting drill rods are bent, and directional drilling is achieved. According to the invention, not only can linear drilling be carried out, but also directional deflecting drilling can be carried out.

Description

Technical Field

[0001] The present invention relates to the field of drilling in soil layers or rocks, and in particular to an apparatus for extracting undisturbed core, specifically a continuous deflecting wireline coring drill and method for directional drilling. Background Art

[0002] Common engineering drilling means include vertical drilling, inclined drilling, and horizontal drilling, and these three types of drilling techniques all belong to the category of straight-line drilling. Straight-line drilling has been widely used due to its relatively low construction cost and simple structure. However, because of its relatively simple structure and lack of components for generating deflection, it cannot generate bending during drilling and can only be used in the field of straight-line drilling, with limited application scope. With the development of infrastructure projects such as water conservancy and hydropower, railways, etc. in China, there is a need to carry out curved drilling across rivers or along the axis of hydraulic tunnels, and thus research on directional coring technology that can perform curved drilling has gradually begun.

[0003] The technology that can perform curved drilling has achieved certain development in the field of petroleum engineering exploration. However, petroleum engineering exploration is a type of drilling without core sampling, which is essentially different from the drilling in water conservancy and hydropower projects that require core sampling, and its technology cannot be applied to drilling that requires core sampling.

[0004] Currently, existing directional deflecting coring drilling apparatuses mainly achieve directional deflecting coring drilling by adding an eccentric component outside the drill pipe. The eccentric component has a protruding part, and the protruding part pushes against the hole wall of the borehole. The reaction force of the hole wall causes the rigid drill pipe to produce a small degree of bending, thereby achieving directional deflecting coring drilling. This directional deflecting coring drilling apparatus has many problems, mainly including: First, the eccentric component is coaxial with the drill pipe. During the lowering of the drill pipe, the eccentric component rotates synchronously with the drill pipe. Due to the lack of measures for positioning and controlling the direction of the eccentric component, it is difficult to ensure that the protruding part is located at the preset position, resulting in an incorrect bending direction of the drill pipe. Second, the volume of the eccentric component is relatively large, and engineering drilling also requires core sampling. The eccentric component leads to a very small core sampling channel. Third, the structure of the eccentric component is complex. Since the drilling that requires core sampling is water drilling, the eccentric component is easily damaged in a drilling environment such as water, cuttings, and mud. Fourth, the length of the protruding part of the eccentric component is limited, the deflecting amplitude is small, and the deflecting efficiency is low. Fifth, the drilling uses hole-opening power. When the drilling depth is relatively large, the drilling power is insufficient, and the drill pipe is severely worn. Sixth, no dedicated wireline coring device is provided inside the drill pipe for directional deflecting drilling, resulting in a low core sampling rate and easy fracture and damage of the core. Summary of the Invention

[0005] The present invention first provides a continuous deflecting wireline coring drill for directional drilling, which solves the problems of difficult control of the deflecting direction of existing drilling apparatuses and low core sampling rate.

[0006] The technical solution adopted by the present invention is as follows: A continuous deflecting wireline coring drill for directional drilling, comprising a deflecting drill pipe, a hollow motor, and a drill bit. The deflecting drill pipe is divided into two sections, namely a first deflecting drill pipe and a second deflecting drill pipe. It is set that the central axes of the two sections of deflecting drill pipes are both vertical. The deflecting drill pipe includes a spring tube in the middle, and an upper joint tube and a lower joint tube fixedly connected to the upper and lower ends of the spring tube respectively. The lower joint tube of the first deflecting drill pipe is connected to the upper joint tube of the second deflecting drill pipe. The lower joint tube of the second deflecting drill pipe is connected to the hollow motor. The lower end of the hollow motor is the output end and is connected to the drill bit. A continuous and cylindrical coring cavity is formed inside the first deflecting drill pipe, the second deflecting drill pipe, the hollow motor, and the drill bit. The spring tube includes a flexible tube body and a skeleton embedded in the flexible tube body. The skeleton is a spring-shaped pipe fitting formed by tightly winding or spaced winding of steel bars. An installation groove is provided on the outer side of the lower joint tube of the first deflecting drill pipe and / or the upper joint tube of the second deflecting drill pipe. A deflecting motor is fixedly installed in the installation groove. A jacking device is also provided in the installation groove. The transmission shaft of the deflecting motor is in transmission cooperation with the jacking device. The deflecting motor can control the jacking device to be completely located inside the installation groove and outside the installation groove.

[0007] The deflecting motor is used to control and maintain the posture of the jacking device, so as to control the two sections of deflecting drill pipes to be straight or bent during drilling, and further realize straight drilling and directional deflecting drilling. In order to reduce the requirements for the deflecting motor, further: The exposed section of the transmission shaft of the deflecting motor is divided into two sections. The two sections are respectively provided with external threads in opposite directions. The two sections are respectively provided with a matching first nut and a second nut. The first nut is provided with a connecting ear and is rotatably connected to the first end of the first connecting rod. The second nut is provided with a connecting ear and is rotatably connected to the first end of the second connecting rod. The second end of the first connecting rod is rotatably connected to the second end of the second connecting rod. The rotation axes of the two ends of the first connecting rod and the two ends of the second connecting rod are parallel to each other and perpendicular to the axis of the transmission shaft.

[0008] In order to improve the reliability of the rotational connection of the jacking device, further: The connecting ear of the first nut and the first end of the first connecting rod are riveted by a rivet. The connecting ear of the second nut and the first end of the second connecting rod are riveted by a rivet. The second end of the first connecting rod and the second end of the second connecting rod are riveted by a rivet.

[0009] In order to facilitate the connection of the deflecting drill pipe, the stable connection between the deflecting drill pipe and the straight drill pipe, and the stable connection between the deflecting drill pipe and the hollow motor, further: The upper and lower ends of the skeleton of the spring tube are respectively fixedly connected to the upper joint tube and the lower joint tube. The upper joint tube and the lower joint tube of the deflecting drill pipe are mutually adapted. One of the upper joint tube and the lower joint tube is an external thread joint tube, and the other is an internal thread joint tube.

[0010] The hollow motor is directly connected to the drill bit and drives the drill bit to rotate, reducing power loss through the downhole power method. Specifically: The hollow motor includes a stator and a rotor outside the stator. The stator is a hollow tubular structure with both upper and lower ends open. A stator joint is provided at the upper end of the stator and is fixedly connected to the lower joint pipe of the second whipstock drill pipe. A rotor joint is provided at the lower end of the rotor and is fixedly connected to the drill bit. A sealing ring and a bearing are provided between the stator and the rotor, and the bearing is located in the sealed cavity formed by the stator, the rotor, and the sealing ring.

[0011] The core barrel is used to place the wireline coring device to obtain cores. Further: The continuous whipstock wireline coring drill for directional drilling further includes a wireline coring device installed in the core barrel. The wireline coring device includes a core barrel and a limiting mechanism connected to the upper end of the core barrel. The core barrel includes a flexible tube body and a skeleton embedded in the flexible tube body. The skeleton is a helical steel wire. A fishing head is provided at the top of the limiting mechanism, and a lug for engaging with the card slot inside the straight drill pipe is provided on the outer periphery of the limiting mechanism.

[0012] To facilitate the sliding and removal of the wireline coring device in the core barrel, further: At least one sliding seat is provided on the outer side of the core barrel. The sliding seat is provided with a ball groove, and balls are installed in the ball groove. The balls are in rolling fit with the wall of the core barrel. The lower end of the core barrel is fixedly connected to a guide pipe, and sliding seats and balls are provided on the outer side of the guide pipe.

[0013] The present invention also provides a continuous whipstock wireline coring method for directional drilling, which also solves the problems of difficult control of the whipstock direction and low core recovery rate of existing drilling devices. The technical solution adopted by the present invention is that the continuous whipstock wireline coring method for directional drilling uses any of the above-mentioned continuous whipstock wireline coring drills for directional drilling to drill and take cores, including the following steps: S1. Fix the upper end of the straight drill pipe to the hole-opening drill rig, and fix the lower end of the straight drill pipe to the upper joint pipe of the first whipstock drill pipe. Place the wireline coring device into the core barrel and fix it. To facilitate the fixing and extraction of the wireline coring device, further: A card slot is provided inside the lower end of the straight drill pipe. The wireline coring device includes a core barrel and a limiting mechanism connected to the upper end of the core barrel. A fishing head is provided at the top of the limiting mechanism, and a lug is provided on the outer periphery of the limiting mechanism. After the wireline coring device is placed in the core barrel, the lug automatically snaps into the card slot.

[0014] S2. Control the two whipstock drill pipes to be in a straight or curved shape through the whipstock motor, then apply pressure to the straight drill pipe through the hole-opening drill rig, and drive the drill bit to rotate using the hollow motor to break the rock and drill. When the core fills the core barrel of the wireline coring device, stop drilling, take out the wireline coring device, and obtain the core.

[0015] S3. Place the wireline coring device into the core barrel and fix it, and repeat step S2 until drilling reaches the target position.

[0016] To control the actual drilling trajectory to be consistent with the predetermined drilling trajectory, further: before putting the wireline coring device into the coring cavity in step S3, a borehole inclinometer is put into the coring cavity to test the drilling trajectory from the hole mouth to the hole bottom, and accordingly, the postures of the two steerable drill pipes are adjusted by the steering motor.

[0017] The beneficial effects of the present invention are as follows: The continuous steerable wireline coring drill for directional drilling can not only perform straight drilling but also perform directional steering drilling, enabling a set of drill to have two drilling functions simultaneously. The steering motor can control the ejection device to be completely located within the installation groove. At this time, the ejection device will not push against the hole wall of the borehole, and the centerlines of the two steerable drill pipes are straight lines for straight drilling; the steering motor can also control the ejection device to be partially or completely located outside the installation groove. At this time, the ejection device will push against the hole wall of the borehole, and the centerlines of the two steerable drill pipes are curves for directional steering drilling.

[0018] After being bent, the flexible pipe of the steerable drill pipe is in an arc shape or a shape close to an arc, with little impact on the coring operation, reducing the risk of core fracture, facilitating the coring operation and improving the core recovery rate. The steering motor can control whether the two steerable drill pipes are bent and can also control the degree of bending of the two steerable drill pipes. The operation is simple, and the postures of the two steerable drill pipes are stable, facilitating the quick adjustment of the degree of bending of the two steerable drill pipes to meet the needs of various directional steering drillings.

[0019] The hollow motor is connected to the lower end of the second steerable drill pipe. The hollow motor is of a hollow tubular structure and has no impact on the coring operation. The hollow motor directly drives the drill bit at the bottom of the borehole, with little power loss, avoiding the problems of large friction between the drill pipe and the hole wall of the borehole and large wear of the drill pipe during the drilling process of driving the drill pipe and the drill bit to rotate by the hole mouth drilling rig, as well as the problem of large power loss. Therefore, the present invention can be used for ultra-deep hole drilling and has a high drilling efficiency.

[0020] During the drilling process, the steerable drill pipe, the hollow motor, and the drill bit do not need to be lifted out of the borehole. Only when the drill bit needs to be replaced, the steerable drill pipe, the hollow motor, and the drill bit are lifted out. The entire drilling process is simple in operation and low in implementation cost. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of an embodiment of the continuous steerable wireline coring drill for directional drilling of the present invention in a natural state.

[0022] Figure 2 is Figure 1 an enlarged view of the steering motor and the ejection device in the shown embodiment.

[0023] Figure 3 is Figure 1Schematic diagram of the illustrated embodiment in the A-A cross-section.

[0024] Figure 4 is Figure 1 Schematic diagram of the structure of the illustrated embodiment in the directional drilling state.

[0025] Reference numerals: the first whipstock drill pipe 1a, the second whipstock drill pipe 1b, the spring tube 1-2, the upper joint pipe 1-1, the lower joint pipe 1-3, the hollow motor 2, the stator 2-1, the rotor 2-2, the stator joint 2-3, the rotor joint 2-4, the sealing ring 2-5, the bearing 2-6, the drill bit 3, the whipstock motor 4-1, the transmission shaft 4-2, the first nut 4-3, the second nut 4-4, the first connecting rod 4-5, the second connecting rod 4-6, the core barrel 5-1, the limiting mechanism 5-2, the fishing head 5-2-1, the ear 5-2-2, the sliding seat 5-3, the ball 5-4, the guide pipe 5-5, the straight drill pipe 6. Detailed implementation manners

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] The first subject of the present invention is a continuous whipstock wireline coring drill for directional drilling. Refer to Figure 1 and Figure 4 , the continuous whipstock wireline coring drill for directional drilling includes whipstock drill pipes, a hollow motor 2 and a drill bit 3. The whipstock drill pipes are two sections, namely the first whipstock drill pipe 1a and the second whipstock drill pipe 1b. The continuous whipstock wireline coring drill for directional drilling has two states, namely the natural state and the directional drilling state. In the natural state, the central axes of the first whipstock drill pipe 1a and the second whipstock drill pipe 1b are straight lines and coincide. Refer to Figure 1 ; in the directional drilling state, the first whipstock drill pipe 1a and the second whipstock drill pipe 1b are curves. Refer to Figure 4For ease of description, it is assumed that in the natural state, the central axes of the first whipstock drill pipe 1a and the second whipstock drill pipe 1b are both vertical, that is, the central axes of the two whipstock drill pipes are both vertical and coincide. The whipstock drill pipe includes a central spring tube 1-2, and an upper joint pipe 1-1 and a lower joint pipe 1-3 fixedly connected to the upper and lower ends of the spring tube 1-2 respectively. Both the upper joint pipe 1-1 and the lower joint pipe 1-3 play a connecting role. The upper joint pipe 1-1 of the first whipstock drill pipe 1a is used to connect to the straight drill pipe 6, the lower joint pipe 1-3 of the first whipstock drill pipe 1a is connected to the upper joint pipe 1-1 of the second whipstock drill pipe 1b, and the lower joint pipe 1-3 of the second whipstock drill pipe 1b is connected to the hollow motor 2. In order to facilitate the connection between the first whipstock drill pipe 1a and the straight drill pipe 6, the connection between the first whipstock drill pipe 1a and the second whipstock drill pipe 1b, and the connection between the second whipstock drill pipe 1b and the hollow motor 2, the hollow motor 2 is provided with a joint adapted to the lower joint pipe 1-3 of the second whipstock drill pipe 1b. The upper joint pipe 1-1 and the lower joint pipe 1-3 of the whipstock drill pipe are adapted to each other, and one of the upper joint pipe 1-1 and the lower joint pipe 1-3 is an external thread joint pipe and the other is an internal thread joint pipe. The upper and lower ends of the two whipstock drill pipes can be interchanged.

[0028] The lower end of the hollow motor 2 is the output end and is connected to the drill bit 3. The hollow motor 2 provides power for drilling. At the same time, the middle part of the hollow motor 2 is a hollow structure to avoid affecting coring. See Figure 1 、 Figure 3 and Figure 4, the hollow motor 2 includes a stator 2-1 and a rotor 2-2 outside the stator 2-1. Components such as magnets and coils are also arranged between the stator 2-1 and the rotor 2-2. The stator 2-1 is a hollow tubular structure, and the inner diameter of the stator 2-1 is the same as the inner diameter of the lower joint pipe 1-3 of the second whipstock drill pipe 1b. Both the upper and lower ends of the stator 2-1 are open. A stator joint 2-3 is arranged at the upper end of the stator 2-1, and the stator joint 2-3 is fixedly connected to the lower joint pipe 1-3 of the second whipstock drill pipe 1b. The connection method between the stator joint 2-3 and the lower joint pipe 1-3 of the second whipstock drill pipe 1b is generally a threaded connection. The stator joint 2-3 can be a part of the stator 2-1 or a joint fixedly installed at the upper end of the stator 2-1. A sealing ring 2-5 and a bearing 2-6 are arranged between the stator 2-1 and the rotor 2-2. The sealing ring 2-5 includes an upper sealing ring and a lower sealing ring. The bearing 2-6 is located in the sealing cavity formed by the stator 2-1, the rotor 2-2, and the sealing ring 2-5. The sealing ring 2-5 is used to prevent objects such as groundwater and mud from entering the interior of the hollow motor 2. For example, the sealing ring 2-5 is a rubber sealing ring. Another alternative for the sealing ring 2-5 is that sealing end caps are respectively arranged at the top and bottom of the hollow motor 2. The function of the bearing 2-6 is to enable the rotor 2-2 to rotate smoothly, and the bearing 2-6 also needs to be able to withstand axial pressure. A rotor joint 2-4 is arranged at the lower end of the rotor 2-2 and is fixedly connected to the drill bit 3. The rotor joint 2-4 can be a part of the rotor 2-2 or a joint fixedly installed at the lower end of the rotor 2-2. The upper end of the drill bit 3 is provided with a threaded interface adapted to the rotor joint 2-4, and the lower end of the drill bit 3 is provided with cutting teeth for grinding rocks. The drill bit 3 is a hollow circular tube structure, and the function of the drill bit 3 is to grind rocks to separate the rocks inside and outside the drill bit 3.

[0029] The whipstock drill pipe has a hollow circular tube structure with both upper and lower ends open. The main body of the whipstock drill pipe is a spring tube 1-2, and the spring tube 1-2 includes a flexible tube body and a skeleton embedded in the flexible tube body. The skeleton is a spring-shaped pipe fitting formed by helically winding steel bars. When the steel bars are helically wound, they can be wound tightly, that is, there is no gap between adjacent turns of steel bars. In the natural state, adjacent turns of steel bars have no gap and are in direct contact; when the steel bars are helically wound, they can also be wound at intervals, that is, a gap is reserved between adjacent turns of steel bars. In the natural state, there is a gap between adjacent turns of steel bars and they are not in direct contact. The flexible tube body serves to seal the gaps and crevices of the skeleton, so that there will be no leakage whether the central axis of the spring tube 1-2 is straight or curved. The flexible tube body is arranged inside or outside the skeleton, or simultaneously inside and outside the skeleton. When the flexible tube body is only arranged inside the skeleton, the inner wall of the spring tube 1-2 is flat; when the flexible tube body is only arranged outside the skeleton, the outer wall of the spring tube 1-2 is flat; when the flexible tube body is arranged both inside and outside the skeleton, the inner wall and the outer wall of the spring tube 1-2 are flat. The flexible tube body is generally combined with the skeleton to form a complete spring tube 1-2 by injection molding. The flexible tube body is generally made of a polymer material and has good wear resistance, such as rubber. During drilling, the straight drill pipe 10 needs to apply pressure to the first whipstock drill pipe 1a and transmit it to the drill bit 3. In order to make the first whipstock drill pipe 1a transmit pressure more stably, the skeleton of the spring tube 1-2 is preferably wound tightly with steel bars. The upper joint pipe 1-1 and the lower joint pipe 1-3 at both ends of the spring tube 1-2 both play a connecting role. In order to firmly connect the spring tube 1-2 with the upper joint pipe 1-1 and firmly connect the spring tube 1-2 with the lower joint pipe 1-3, the upper and lower ends of the skeleton are fixedly connected to the upper joint pipe 1-1 and the lower joint pipe 1-3 respectively, such as by welding connection.

[0030] An installation groove is provided on the outer side of the lower joint pipe 1-3 of the first whipstock drill pipe 1a and / or the upper joint pipe 1-1 of the second whipstock drill pipe 1b, that is, an installation groove is provided on the outer side of at least one of the lower joint pipe 1-3 of the first whipstock drill pipe 1a and the upper joint pipe 1-1 of the second whipstock drill pipe 1b. In Figure 1 and Figure 4In the illustrated embodiment, an installation groove is provided only on the outer side of the upper joint pipe 1-1 of the second whipstock drill pipe 1b. An inclination motor 4-1 is fixedly installed in the installation groove, and an ejection device is also provided in the installation groove. The transmission shaft 4-2 of the inclination motor 4-1 is in transmission cooperation with the ejection device. The inclination motor 4-1 can control the ejection device to be completely located within the installation groove and outside the installation groove. When the ejection device is completely located within the installation groove, there is no acting force between the ejection device and the hole wall of the drill hole. The central axes of the first whipstock drill pipe 1a and the second whipstock drill pipe 1b are straight lines and coincide. At this time, straight drilling is suitable; when the ejection device is completely or partially located outside the installation groove, the ejection device pushes against the hole wall of the drill hole, and the hole wall of the drill hole generates a reaction force on the ejection device. Under the action of this reaction force, the first whipstock drill pipe 1a and the second whipstock drill pipe 1b are bent. At this time, directional whipstock drilling is suitable.

[0031] The inclination motor 4-1 is used to control and maintain the attitude of the ejection device, so as to control the two whipstock drill pipes to be straight or bent during drilling, and thus realize straight drilling and directional whipstock drilling. The ejection device only needs to be able to push against the hole wall of the drill hole under the drive of the inclination motor 4-1. A specific embodiment of the ejection device is provided below. Refer to Figure 1 、 Figure 2 and Figure 4 , the exposed section of the transmission shaft 4-2 of the inclination motor 4-1 is divided into two sections, and the two sections are respectively provided with external threads with opposite directions. The first nut 4-3 and the second nut 4-4 that fit are respectively sleeved on the two sections. On the premise that the first nut 4-3 and the second nut 4-4 will not rotate with the rotation of the transmission shaft 4-2, when the transmission shaft 4-2 rotates forward, the first nut 4-3 and the second nut 4-4 approach relatively; when the transmission shaft 4-2 rotates reversely, the first nut 4-3 and the second nut 4-4 move away relatively. In order to improve the stability of the ejection device, a bearing can be provided at the end of the transmission shaft 4-2 far from the inclination motor 4-1. The bearing is fixedly installed in the installation groove, and the first nut 4-3 and the second nut 4-4 are located between the bearing and the inclination motor 4-1. The first nut 4-3 is provided with a connecting ear and is rotatably connected to the first end of the first connecting rod 4-5. The second nut 4-4 is provided with a connecting ear and is rotatably connected to the first end of the second connecting rod 4-6. The second end of the first connecting rod 4-5 is rotatably connected to the second end of the second connecting rod 4-6. The rotation axes of the two ends of the first connecting rod 4-5 and the two ends of the second connecting rod 4-6 are parallel to each other and perpendicular to the axis of the transmission shaft 4-2. When the first nut 4-3 and the second nut 4-4 move away from each other to the farthest, the first connecting rod 4-5 and the second connecting rod 4-6 are located in the installation groove and are in a straight line. At this time, the first connecting rod 4-5 and the second connecting rod 4-6 are preferably flush with the installation groove, as shown in Figure 1 and Figure 2 shown; when the first nut 4-3 and the second nut 4-4 approach, the first connecting rod 4-5 and the second connecting rod 4-6 are in an angular shape and protrude from the installation groove, as shown in Figure 4As shown. The connecting lugs of the first nut 4-3 and the connecting lugs of the second nut 4-4 on the one hand play the role of connecting the first connecting rod 4-5 and the second connecting rod 4-6, and on the other hand play the role of preventing the first nut 4-3 and the second nut 4-4 from rotating along with the transmission shaft 4-2. In order to improve the reliability of the rotational connection of the ejection device and avoid the failure of the rotational connection, the connecting lug of the first nut 4-3 and the first end of the first connecting rod 4-5 are riveted by a rivet, the connecting lug of the second nut 4-4 and the first end of the second connecting rod 4-6 are riveted by a rivet, and the second end of the first connecting rod 4-5 and the second end of the second connecting rod 4-6 are riveted by a rivet.

[0032] In the natural state, a continuous and cylindrical coring cavity is formed inside the first whipstock drill pipe 1a, the second whipstock drill pipe 1b, the hollow motor 2 and the drill bit 3. The coring cavity is used to place the wireline coring device to obtain the core. The continuous whipstock wireline coring drill for directional drilling of the present invention further includes a wireline coring device installed in the coring cavity. The wireline coring device includes a coring tube 5-1 and a limiting mechanism 5-2 connected to the upper end of the coring tube 5-1. The coring tube 5-1 and the limiting mechanism 5-2 are directly or indirectly fixedly connected. For example, an upper guide tube is fixed to the upper end of the coring tube 5-1, and the upper guide tube is threadedly connected to the limiting mechanism 5-2, such as Figure 1 and Figure 4As shown in the figure. The core barrel 5-1 is used to store cores. The core barrel 5-1 has a certain strength and can be deformed to adapt to the attitude changes of the first whipstock drill pipe 1a and the second whipstock drill pipe 1b, solve the problem that the core is easily fractured and damaged during directional whipstock drilling, and improve the core recovery rate. The outer diameter of the core barrel 5-1 is smaller than the diameter of the core chamber, ensuring that the core barrel 5-1 can be smoothly placed into and taken out of the core chamber. The lower end of the core barrel 5-1 is a free end and is placed on the inner wall base of the drill bit 3. For example, the core barrel 5-1 includes a flexible tube body and a skeleton embedded in the flexible tube body. The skeleton is a helical steel wire, and is formed by injection molding inside and outside the helical skeleton through a mold. The flexible tube body of the core barrel 5-1 is generally made of a polymer material, such as rubber. The inner and outer walls of the core barrel 5-1 are straight and smooth, and can be bent and deformed along with the bending changes of the two whipstock drill pipes. The flexible tube body keeps the core barrel 5-1 always closed, preventing the core from being exposed outside the core barrel 5-1. The limiting mechanism 5-2 is used to lower and take out the core barrel 5-1 and fix the core barrel 5-1 at an appropriate position. The top of the limiting mechanism 5-2 is provided with a fishing head 5-2-1, and the fishing head 5-2-1 is used to lower the wireline coring device into the core chamber and fix it. The fishing head 5-2-1 is generally a conical head, and the fishing head 5-2-1 can be fished and released by a fishing tool. The outer periphery of the limiting mechanism 5-2 is provided with lugs 5-2-2 for engaging with the card slots on the inner side of the straight drill pipe 6. The lugs 5-2-2 are generally two and are symmetrically arranged. The lugs 5-2-2 are equipped with components such as a rotating shaft and an opening spring. The opening spring can make the lugs 5-2-2 open, and the rotating shaft can make the lugs 5-2-2 rotate.

[0033] To facilitate the sliding and removal of the wireline coring device in the core chamber, at least one slide seat 5-3 is arranged on the outer side of the core barrel 5-1. The slide seats 5-3 are arranged in a ring shape. The slide seats 5-3 are provided with ball grooves, and balls 5-4 are installed in the ball grooves. The balls 5-4 are in rolling cooperation with the wall of the core chamber. To facilitate the lowering of the core barrel 5-1, the lower end of the core barrel 5-1 is fixedly connected to a guide pipe 5-5, and the outer side of the guide pipe 5-5 is provided with slide seats 5-3 and balls 5-4. For example, see Figure 1 and Figure 4 , slide seats 5-3 are respectively arranged in a circle at the upper and lower ends of the core barrel 5-1. A circle of slide seats 5-3 includes at least three slide seats 5-3. The guide pipe 5-5 at the lower end of the core barrel 5-1 can also prevent the core barrel 5-1 from rotating synchronously when the hollow motor 2 rotates. To facilitate the lowering of the core barrel 5-1 into the core chamber, the outer side of the lower end of the guide pipe 5-5 at the lower end of the core barrel 5-1 is provided with a conical cut, as shown in Figure 1 and Figure 4 shown. The upper end of the core barrel 5-1 can be directly or indirectly connected to the limiting mechanism 5-2. For example, the upper end of the core barrel 5-1 is provided with an upper guide pipe, and the upper guide pipe is threadedly connected to the limiting mechanism 5-2. A circle of slide seats 5-3 is arranged on the outer periphery of the upper guide pipe. SeeFigure 1 and Figure 4 。

[0034] The second subject of the present invention is a continuous deflecting wireline coring method for directional drilling. The continuous deflecting wireline coring method for directional drilling uses the continuous deflecting wireline coring tool for directional drilling described in the above first subject to conduct drilling and core sampling, and includes the following steps.

[0035] S1. Fix the upper end of the straight drill pipe 6 to the hole-opening drilling rig, fix the lower end of the straight drill pipe 6 to the upper joint pipe 1-1 of the first deflecting drill pipe 1a, place the wireline coring device into the core sampling cavity and fix it.

[0036] The straight drill pipe 6 is a hollow pipe, and the straight drill pipe 6 can produce a small bending deformation under an external force. Threaded interfaces that match each other are respectively arranged at the upper and lower ends of the straight drill pipe 6. According to the depth of the borehole, the number of straight drill pipes 6 is one or more. When there are multiple straight drill pipes 6, they are connected in a series connection. The straight drill pipe 6 mainly transmits tensile force and pressure. The wires of the deflecting motor 4-1 and the wires of the hollow motor 2 can pass through the straight drill pipe 6 and pass out of the upper end of the straight drill pipe 6 to the outside of the hole opening, or can be located outside the straight drill pipe 6 and pass out of the hole opening. The straight drill pipe 6 also forms a channel for the circulation of drilling slurry and wireline coring. The outer diameter of the straight drill pipe 6 is less than or equal to the outer diameter of the deflecting drill pipe 1, and the inner diameter of the straight drill pipe 6 is equal to the diameter of the core sampling cavity. In order to facilitate the positioning of the direction of the straight drill pipe 6, vertical stripes are preferably arranged on the outer wall of the straight drill pipe 6.

[0037] In order to facilitate the fixing and extraction of the wireline coring device, a card slot for cooperating with the wireline coring device is arranged on the inner side of the lower end of the straight drill pipe 6 directly connected to the first deflecting drill pipe 1a. The wireline coring device includes a core sampling tube 5-1 and a limiting mechanism 5-2 connected to the upper end of the core sampling tube 5-1. A fishing head 5-2-1 is arranged at the top of the limiting mechanism 5-2, and a clamping ear 5-2-2 is arranged on the outer periphery of the limiting mechanism 5-2. After the wireline coring device is placed in the core sampling cavity, the clamping ear 5-2-2 automatically snaps into the card slot.

[0038] S2. Control the two deflecting drill pipes to be in a straight shape or a bent shape through the deflecting motor 4-1, then apply pressure to the straight drill pipe 6 through the hole-opening drilling rig, and drive the drill bit 3 to rotate by using the hollow motor 2 to make the drill bit 3 break through the rock and drill; when the core fills the core sampling tube 5-1 of the wireline coring device, stop drilling, take out the wireline coring device and obtain the core.

[0039] The drilling process is divided into two types, namely straight drilling and directional drilling. During straight drilling, the central axes of the straight drill pipe 6, the deflecting drill pipe, the hollow motor 2 and the drill bit 3 coincide; during directional drilling, the attitude of the deflecting drill pipe is adjusted through the deflecting motor 4-1, and the first deflecting drill pipe 1a and the second deflecting drill pipe 1b are in a bent shape.

[0040] S3. Place the wireline coring device into the coring cavity and fix it, and repeat step S2 until drilling reaches the target position.

[0041] In order to control the actual drilling trajectory to be consistent with the predetermined drilling trajectory, before placing the wireline coring device into the coring cavity in step S3, a borehole inclinometer is placed into the coring cavity to test the borehole trajectory from the hole mouth to the hole bottom, and accordingly, the attitude of the two steerable drill pipes is adjusted by the steering motor 4-1. Compare the tested borehole trajectory with the designed borehole trajectory. When the drilling direction deviates, by adjusting the forward or reverse rotation of the steering motor 4-1, the bending degree of the two steerable drill pipes is increased or decreased accordingly, thereby realizing the deviation correction of the drilling direction during drilling.

Claims

1. A continuous deflecting wireline coring drill tool for directional drilling, comprising a deflecting drill pipe, a hollow motor (2) and a drill bit (3), characterized in that: The whipstock drill pipe is divided into two sections, namely the first whipstock drill pipe (1a) and the second whipstock drill pipe (1b). It is set that the central axes of the two sections of whipstock drill pipes are both vertical. The whipstock drill pipe includes a spring tube (1-2) in the middle, and an upper joint pipe (1-1) and a lower joint pipe (1-3) fixedly connected to the upper and lower ends of the spring tube (1-2). The lower joint pipe (1-3) of the first whipstock drill pipe (1a) is connected to the upper joint pipe (1-1) of the second whipstock drill pipe (1b). The lower joint pipe (1-3) of the second whipstock drill pipe (1b) is connected to a hollow motor (2). The lower end of the hollow motor (2) is the output end and is connected to a drill bit (3). A continuous and cylindrical coring cavity is formed inside the first whipstock drill pipe (1a), the second whipstock drill pipe (1b), the hollow motor (2) and the drill bit (3). The spring tube (1-2) includes a flexible tube body and a skeleton embedded in the flexible tube body. The skeleton is a spring-shaped pipe fitting formed by tightly winding or spaced winding of steel bars. An installation groove is provided on the outer side of the lower joint pipe (1-3) of the first whipstock drill pipe (1a) and / or the upper joint pipe (1-1) of the second whipstock drill pipe (1b). An inclinometer motor (4-1) is fixedly installed in the installation groove. A jacking device is also provided in the installation groove. The transmission shaft (4-2) of the inclinometer motor (4-1) is in transmission cooperation with the jacking device. The inclinometer motor (4-1) can control the jacking device to be completely located inside the installation groove and located outside the installation groove.

2. The wireline coring drill for directional drilling according to claim 1, characterized in that: The exposed section of the transmission shaft (4-2) of the inclinometer motor (4-1) is divided into two sections. The two sections are respectively provided with external threads in opposite directions. The two sections are respectively penetrated by a matching first nut (4-3) and a second nut (4-4). The first nut (4-3) is provided with a connecting ear and is rotatably connected to the first end of a first connecting rod (4-5). The second nut (4-4) is provided with a connecting ear and is rotatably connected to the first end of a second connecting rod (4-6). The second end of the first connecting rod (4-5) is rotatably connected to the second end of the second connecting rod (4-6). The rotation axes of the connections at both ends of the first connecting rod (4-5) and both ends of the second connecting rod (4-6) are parallel to each other and perpendicular to the axis of the transmission shaft (4-2).

3. The wireline coring drill for directional drilling according to claim 2, wherein: The connecting ear of the first nut (4-3) and the first end of the first connecting rod (4-5) are riveted by a rivet. The connecting ear of the second nut (4-4) and the first end of the second connecting rod (4-6) are riveted by a rivet. The second end of the first connecting rod (4-5) and the second end of the second connecting rod (4-6) are riveted by a rivet.

4. The wireline coring drill for directional drilling according to claim 1, characterized in that: The upper and lower ends of the skeleton of the spring tube (1-2) are respectively fixedly connected to the upper joint pipe (1-1) and the lower joint pipe (1-3). The upper joint pipe (1-1) and the lower joint pipe (1-3) of the whipstock drill pipe are mutually adapted. One of the upper joint pipe (1-1) and the lower joint pipe (1-3) is an external thread joint pipe, and the other is an internal thread joint pipe.

5. The wireline coring drill for directional drilling according to claim 1, characterized in that: The hollow motor (2) includes a stator (2-1) and a rotor (2-2) outside the stator (2-1). The stator (2-1) is a hollow tubular structure with both upper and lower ends open. A stator connector (2-3) is provided at the upper end of the stator (2-1) and is fixedly connected to the lower joint pipe (1-3) of the second whipstock drill pipe (1b). A rotor connector (2-4) is provided at the lower end of the rotor (2-2) and is fixedly connected to the drill bit (3). A sealing ring (2-5) and a bearing (2-6) are provided between the stator (2-1) and the rotor (2-2), and the bearing (2-6) is located in the sealing cavity formed by the stator (2-1), the rotor (2-2), and the sealing ring (2-5).

6. The wireline coring drill for directional drilling according to any one of claims 1 to 5, characterized in that: The continuous whipstock wireline coring drill for directional drilling further includes a wireline coring device installed in the coring cavity. The wireline coring device includes a coring tube (5-1) and a limiting mechanism (5-2) connected to the upper end of the coring tube (5-1). The coring tube (5-1) includes a flexible tube body and a skeleton embedded in the flexible tube body. The skeleton is a helical steel wire. A fishing head (5-2-1) is provided at the top of the limiting mechanism (5-2), and a lug (5-2-2) for engaging with a card slot inside the straight drill pipe (6) is provided on the outer periphery of the limiting mechanism (5-2).

7. The wireline coring drill for directional drilling according to claim 6, characterized in that: At least one sliding seat (5-3) is provided on the outer side of the coring tube (5-1). The sliding seat (5-3) is provided with a ball groove, and balls (5-4) are installed in the ball groove. The balls (5-4) are in rolling fit with the wall of the coring cavity. The lower end of the coring tube (5-1) is fixedly connected to a guide tube (5-5), and sliding seats (5-3) and balls (5-4) are provided on the outer side of the guide tube (5-5).

8. The continuous inclined hole wireline coring method for directional drilling is characterized in that, Using the continuous whipstock wireline coring drill for directional drilling according to any one of claims 1-7 above for drilling and coring, includes the following steps: S1. Fix the upper end of the straight drill pipe (6) to the orifice drill rig, fix the lower end of the straight drill pipe (6) to the upper joint pipe (1-1) of the first whipstock drill pipe (1a), and place the wireline coring device into the coring cavity and fix it; S2. Control the two whipstock drill pipes to be straight or bent by the whipstock motor (4-1), then apply pressure to the straight drill pipe (6) through the orifice drill rig, and drive the drill bit (3) to rotate by using the hollow motor (2) to make the drill bit (3) break through the rock and drill. When the core fills the coring tube (5-1) of the wireline coring device, stop drilling, take out the wireline coring device and obtain the core; S3. Place the wireline coring device into the coring cavity and fix it, and repeat step S2 until drilling reaches the target position.

9. The continuous whipstock coring method for directional drilling according to claim 8, characterized in that: A card slot is provided inside the lower end of the straight drill pipe (6). The wireline coring device includes a coring tube (5-1) and a limiting mechanism (5-2) connected to the upper end of the coring tube (5-1). A fishing head (5-2-1) is provided at the top of the limiting mechanism (5-2), and a lug (5-2-2) is provided on the outer periphery of the limiting mechanism (5-2). After the wireline coring device is placed into the coring cavity, the lug (5-2-2) automatically snaps into the card slot.

10. The continuous whipstocking wireline coring method according to claim 8 or 9, characterized in that: Before the wireline coring device is placed into the coring cavity in step S3, a borehole inclinometer is placed into the coring cavity and the borehole trajectory from the hole mouth to the hole bottom is tested, and based on this, the attitudes of the two steerable drill pipes are adjusted by the steering motor (4-1).

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