Directional deflecting continuous coring drilling tool and method

Abstract

The invention discloses a directional deflecting continuous coring drilling tool and method, 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 directional deflecting continuous coring drilling tool comprises deflecting drill rods, a hollow motor and a drill bit, the deflecting drill rods are connected in series when being divided into multiple sections, the deflecting drill rod at the lowermost end is connected with the hollow motor, the hollow motor is connected with the drill bit, and a coring cavity is formed in the deflecting drill rods, the hollow motor and the drill bit; the deflecting drill rod comprises a spring pipe in the middle, 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, the spring pipe comprises a flexible pipe body and a framework embedded into the flexible pipe body, the framework is formed by spirally winding reinforcing steel bars and provided with a through hole, a control piece is arranged in the through hole, and a deflecting motor is fixedly installed on the upper connector pipe. The deflecting motor is connected with one end of the control piece through a transmission structure. The deflecting motor can adjust the posture of the deflecting drill rod, and linear drilling and directional drilling are achieved.

Description

Technical Field

[0001] The present invention relates to the field of drilling in soil layers or rocks, and particularly to a device for extracting undisturbed cores, specifically a directional inclination-forming continuous coring drill and method. Background Art

[0002] Common engineering drilling methods are vertical drilling, inclined drilling, and horizontal drilling. 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 simple structure and no components for generating inclination, it cannot bend 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 for curved drilling across rivers or along the axis of hydraulic tunnels, and thus the 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 drilling method without core extraction, which is essentially different from the drilling in water conservancy and hydropower projects that require core extraction. Its technology cannot be applied to the drilling that requires core extraction.

[0004] Currently, the existing directional inclination-forming coring drilling devices mainly achieve directional inclination-forming 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 bend slightly, thereby realizing directional inclination-forming coring drilling. This directional inclination-forming coring drilling device 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. In engineering drilling, cores also need to be taken, and the eccentric component leads to a very small coring channel; Third, the structure of the eccentric component is complex. Since the drilling that requires core extraction is water drilling, the eccentric component is easily damaged in the drilling environment of water, cuttings, mud, etc.; Fourth, during the drilling process, the protruding part of the eccentric component continuously rubs against the hole wall, and the contact part is easily damaged; Fifth, the length of the protruding part of the eccentric component is limited, the inclination-forming amplitude is small, and the inclination-forming efficiency is low; Sixth, 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; Seventh, there is no dedicated wireline coring device for directional inclination-forming drilling inside the drill pipe, resulting in a low core extraction rate and the core being easily fractured and damaged. Summary of the Invention

[0005] The present invention first provides a directional inclination-forming continuous coring drill to solve the problems of difficult control of the inclination-forming direction and low core extraction rate of the existing drilling devices.

[0006] The technical solution adopted by the present invention is as follows: a directional deflecting continuous coring drill tool, which includes deflecting drill pipes, a hollow motor, and a drill bit. The deflecting drill pipes are one or more sections. It is set that the central axis of the deflecting drill pipes is vertical. The deflecting drill pipes include 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. When there are multiple sections of deflecting drill pipes, each section of deflecting drill pipes is connected in series. The lower joint tube of the lowermost 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 deflecting drill pipes, the hollow motor, and the drill bit; The spring tube includes a flexible tube body and a framework embedded in the flexible tube body. The framework is a spring-shaped pipe fitting formed by helically winding steel bars. The framework is provided with a through hole along the axial direction of the spring tube. A control member is arranged in the through hole. The control member is a push-pull rod or a pull rope. The lower end of the control member is fixedly connected or abutted against the lower joint tube. An inclinometer motor is fixedly installed on the upper joint tube. The output end of the inclinometer motor is connected to the upper end of the control member through a transmission structure. The transmission structure is used to convert the rotational motion of the output end of the inclinometer motor into a linear motion of the control member along its axial direction.

[0007] The inclinometer motor is fixedly installed on the upper joint tube. In order to reduce the risk of damage to the inclinometer motor, further: the upper joint tube is provided with a cavity in the pipe wall, and the inclinometer motor is fixedly installed in the cavity in the pipe wall.

[0008] The output end of the inclinometer motor is connected to the upper end of the control member through a transmission structure. Specifically: the exposed section of the rotating shaft of the inclinometer motor is provided with a threaded interface, and the upper end of the control member is provided with a matching threaded interface. The rotating shaft of the inclinometer motor is threadedly connected to the upper end of the control member.

[0009] The framework of the spring tube is wound tightly or at intervals with steel bars. Further: the framework of the spring tube is wound tightly with steel bars, and the control member is a steel bar; or, the framework of the spring tube is wound at intervals with steel bars, and the control member is a steel bar or a steel wire rope.

[0010] The direction that needs to be deflected during drilling is often fixed. Generally, the drill bit only needs to be inclined in one direction. Further: there are at least two sections of deflecting drill pipes, and the control members in the through holes of each section of deflecting drill pipes are located in the same vertical plane.

[0011] 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, and both the upper and lower ends of the stator are open. A stator joint is arranged at the upper end of the stator and is fixedly connected to the lower joint tube of the deflecting drill pipe. A rotor joint is arranged at the lower end of the rotor and is fixedly connected to the drill bit. A sealing ring and a bearing are arranged between the stator and the rotor. The bearing is located in the sealing cavity formed by the stator, the rotor, and the sealing ring.

[0012] The coring chamber is used to place the wireline coring device to obtain cores. Further, the directional deflecting continuous coring drill also includes a wireline coring device installed in the coring chamber. The wireline coring device includes a coring tube and a limiting mechanism connected to the upper end of the coring tube. The coring tube includes a flexible tube body and a skeleton embedded in the flexible tube body. The skeleton is a spiral steel wire. A fishing head is provided at the top of the limiting mechanism, and a clamping ear is provided on the outer periphery of the limiting mechanism for clamping with the clamping groove on the inner side of the straight drill pipe or the clamping groove on the inner side of the deflecting drill pipe.

[0013] To facilitate the sliding and removal of the wireline coring device in the coring chamber, further, at least one sliding seat is provided on the outer side of the coring tube. The sliding seat is provided with a ball groove, and balls are installed in the ball groove. The balls are in rolling cooperation with the wall of the coring chamber. The lower end of the coring tube is fixedly connected to a guiding tube, and sliding seats and balls are provided on the outer side of the guiding tube.

[0014] The present invention also provides a directional deflecting continuous coring method, which also solves the problems of difficult control of the deflecting direction of the existing drilling device and low core recovery rate. The technical solution adopted by the present invention is that the directional deflecting continuous coring method uses any of the above-mentioned directional deflecting continuous coring drills for drilling and coring, including the following steps: S1. Fix the upper end of the straight drill pipe to the orifice drilling rig, and fix the lower end of the straight drill pipe to the upper joint pipe of the uppermost deflecting drill pipe. Place the wireline coring device into the coring chamber and fix it.

[0015] To facilitate the fixing and extraction of the wireline coring device, further, a clamping groove is provided on the inner side of the lower end of the straight drill pipe, or a clamping groove is provided on the inner side of the deflecting drill pipe. The wireline coring device includes a coring tube and a limiting mechanism connected to the upper end of the coring tube. A fishing head is provided at the top of the limiting mechanism, and a clamping ear is provided on the outer periphery of the limiting mechanism. After the wireline coring device is placed in the coring chamber, the clamping ear automatically snaps into the clamping groove.

[0016] S2. Control the deflecting drill pipe to be in a straight or curved shape through the deflecting motor, then apply pressure to the straight drill pipe through the orifice drilling rig, and drive the drill bit to rotate by using the hollow motor to break rock and drill. When the core fills the coring tube of the wireline coring device, stop drilling, take out the wireline coring device and obtain the core.

[0017] S3. Place the wireline coring device into the coring chamber and fix it, and repeat step S2 until drilling reaches the target position.

[0018] To control the actual drilling trajectory to be consistent with the predetermined drilling trajectory, further, before step S3 places the wireline coring device into the coring chamber, place a borehole inclinometer into the coring chamber and measure the drilling trajectory from the orifice to the bottom of the hole, and adjust the attitude of the deflecting drill pipe accordingly through the deflecting motor.

[0019] The beneficial effects of the present invention are as follows: The directional deviation continuous coring drill can not only perform straight drilling but also directional deviation drilling, enabling a single device to have two drilling functions simultaneously. The deviation motor can control the pushing or pulling of the lower end of the control member against the lower joint pipe, causing the side of the spring tube with a through hole to elongate or shorten accordingly, thereby bending the deviation drill pipe and achieving the purpose of directional deviation drilling. After bending, the spring tube is in an arc shape, which has little impact on the coring operation, reduces the risk of core fracture, facilitates the coring operation, and improves the core recovery rate. When there is no force transmission between the lower end of the control member and the lower joint pipe, the axis of the spring tube is straight, and straight drilling can be performed.

[0020] The deviation motor can control whether the deviation drill pipe bends and can also control the degree of bending of the deviation drill pipe. The operation is simple, and the posture of the deviation drill pipe is stable. At least two sections of the deviation drill pipe are connected in series, and each section of the deviation drill pipe is controlled separately, enabling continuous deviation and deviation at different positions. According to the required deviation amplitude and position, etc., the number of deviation drill pipes can be flexibly increased or decreased, or the posture of the deviation drill pipe at the corresponding position can be adjusted to meet various needs of directional deviation drilling.

[0021] The hollow motor is located at the lower end of the lowermost deviation 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 borehole wall 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.

[0022] During the drilling process, the deviation 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 deviation drill pipe, the hollow motor, and the drill bit are lifted out. The entire drilling process is simple to operate and has a low implementation cost. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of an embodiment of the directional deviation continuous coring drill of the present invention in a natural state.

[0024] Figure 2 is Figure 1 a schematic diagram of the cross-section A - A of the shown embodiment.

[0025] Figure 3 is Figure 1 a schematic diagram of the cross-section B - B of the shown embodiment.

[0026] Figure 4 is Figure 1 a schematic structural diagram of the shown embodiment in the state of directional drilling.

[0027] Reference numerals: whipstock drill pipe 1, bellows 1-2, upper joint pipe 1-1, lower joint pipe 1-3, control member 1-4, whipstock motor 1-5, electric wire 1-6, hollow motor 2, stator 2-1, rotor 2-2, stator joint 2-3, rotor joint 2-4, sealing ring 2-5, bearing 2-6, drill bit 3, core barrel 4-1, limiting mechanism 4-2, fishing head 4-2-1, ear 4-2-2, sliding seat 4-3, ball 4-4, guide pipe 4-5, straight drill pipe 5. Detailed implementation manners

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] The first subject of the present invention is a directional whipstock continuous coring drill tool. Refer to Figure 1 and Figure 4 , the directional whipstock continuous coring drill tool includes a whipstock drill pipe 1, a hollow motor 2 and a drill bit 3. The whipstock drill pipe 1 is one or more sections, and the multiple sections refer to at least two sections. The directional whipstock continuous coring drill tool has two states, namely a natural state and a directional drilling state. In the natural state, the central axis of the whipstock drill pipe 1 is a straight line. Refer to Figure 1 ; in the directional drilling state, the central axis of the whipstock drill pipe 1 is a curve. Refer to Figure 4 . For the convenience of description, it is set that in the natural state, the central axis of the whipstock drill pipe 1 is a straight line and vertical. The whipstock drill pipe 1 includes a bellows 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 bellows 1-2 respectively. When the whipstock drill pipe 1 is multiple sections, each section of the whipstock drill pipe 1 is connected in series, so that continuous whipstocking can be realized, and thus the degree of whipstocking can be improved. For the convenience of serial connection of the whipstock drill pipes 1, the two ends of the whipstock drill pipe 1 are provided with mutually adapted joints, that is, the upper joint pipe 1-1 and the lower joint pipe 1-3 are mutually adapted. For example, the two ends of the whipstock drill pipe 1 are provided with mutually adapted external thread pipes and internal thread pipes, that is, one of the upper joint pipe 1-1 and the lower joint pipe 1-3 is an external thread pipe, and the other is an internal thread pipe.

[0030] The upper joint pipe 1-1 of the uppermost whipstock drill pipe 1 is used to connect with the straight drill pipe 10, and the upper joint pipe 1-1 is generally provided with a threaded interface. The lower joint pipe 1-3 of the lowermost whipstock drill pipe 1 is connected to the hollow motor 2. The lower joint pipe 1-3 is generally a threaded interface, and the lower end of the hollow motor 2 is an output end and is connected to the drill bit 3. When the whipstock drill pipe 1 is one section, the uppermost whipstock drill pipe 1 is the same as the lowermost whipstock drill pipe 1. The upper and lower ends of the whipstock drill pipe 1 can be interchanged.

[0031] 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. Refer to 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 that of the lower joint pipe 1-3. Both the upper and lower ends of the stator 2-1 are open. A stator joint 2-3 is provided 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. The connection method between the stator joint 2-3 and the lower joint pipe 1-3 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 provided 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 bear axial pressure. A rotor joint 2-4 is provided 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.

[0032] The deflecting drill pipe 1 is a hollow circular tube structure with both upper and lower ends open. The main part of the deflecting drill pipe 1 is a spring tube 1-2. 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 two turns of steel bars; when the steel bars are helically wound, they can also be wound at intervals, that is, a gap is reserved between adjacent two turns of steel bars. The flexible tube body functions to seal the gaps and crevices of the skeleton, so that the central axis of the spring tube 1-2 will not leak whether it is a straight line or a curve. The flexible tube body is arranged inside or outside the skeleton, or simultaneously arranged 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 a polymer material and has good wear resistance. For example, the flexible tube body is rubber.

[0033] The frame is provided with a through hole along the axial direction of the spring tube 1-2, and the through hole is generally located in the middle of the frame, that is, the through hole passes through the center line of the steel bar forming the frame. Figure 1 , Figure 2 and Figure 4 A control member 1-4 is provided in the through hole. The control member 1-4 is a push-pull rod or a pull rope. The lower end of the control member 1-4 is fixedly connected or abutted with the lower joint tube 1-3. The upper joint tube 1-1 is fixedly installed with a deflection motor 1-5. The output end of the deflection motor 1-5 is connected to the upper end of the control member 1-4 through a transmission structure. The control member 1-4 is used to control the posture of the spring tube 1-2, so that the spring tube 1-2 bends and maintains the bent state. When the control member 1-4 does not exert force on the lower joint tube 1-3, the spring tube 1-2 is flat, that is, the deflection drill pipe 1 is in a natural state.

[0034] The framework of the spring tube 1-2 is tightly wound or intermittently wound by steel bars. When the framework is tightly wound by steel bars, in the natural state, there is no gap between two adjacent circles of steel bars and they are directly abutted. The control member 1-4 bends the spring tube 1-2 by stretching the steel bars. The control member 1-4 is a push-pull rod, for example, the control member 1-4 is a steel bar rod. When the framework is intermittently wound by steel bars, in the directional drilling state, there is a gap between two adjacent circles of steel bars, and the two adjacent circles of steel bars are not directly abutted. The control member 1-4 expands the gap between the two adjacent circles of steel bars by stretching the steel bars, thereby bending the spring tube 1-2. The control member 1-4 is a push-pull rod, for example, the control member 1-4 is a steel bar rod; or, the control member 1-4 reduces the gap between two adjacent circles of steel bars by compressing the steel bars, thereby bending the spring tube 1-2. The control member 1-4 is a push-pull rod or a pull rope, for example, the control member 1-4 is a steel bar rod or a wire rope. During drilling, the straight drill rod 10 needs to apply pressure to the uppermost deflection drill rod 1 and transmit it to the drill bit 3. In order to make the deflection drill pipe 1 transmit pressure more stably, the skeleton of the spring tube 1-2 is preferably tightly wound with steel bars.

[0035] The whipstock motor 1-5 is fixedly installed on the upper joint pipe 1-1 and is used to control the attitude of the bellows 1-2 through the control member 1-4. The whipstock motor 1-5 is equipped with an electric wire 1-6, and the electric wire 1-6 passes through to the surface and is connected to a control switch. The whipstock motor 1-5 can rotate forward or backward. To reduce the risk of damage to the whipstock motor 1-5, the upper joint pipe 1-1 is provided with a cavity in the pipe wall, and the whipstock motor 1-5 is fixedly installed in the cavity of the pipe wall. The output end of the whipstock motor 1-5 is connected to the upper end of the control member 1-4 through a transmission structure, and the transmission structure is used to convert the rotational motion of the output end of the whipstock motor 1-5 into a linear motion of the control member 1-4 along its axis. For example, the output end of the whipstock motor 1-5 is a rotating shaft, and the exposed section of the rotating shaft is provided with a threaded interface, and the upper end of the control member 1-4 is provided with a matching threaded interface, and the threaded interface of the rotating shaft is threadedly connected to the threaded interface at the upper end of the control member 1-4. Another example is that the output end of the whipstock motor 1-5 is a rotating shaft, the rotating shaft is fixedly installed with a gear, the upper end of the control member 1-4 is provided with a matching tooth groove, and the gear of the rotating shaft is adapted to the tooth groove.

[0036] During drilling, the direction that needs to be deflected is often fixed, and the drill bit 3 generally only needs to be inclined in one direction. When there are at least two sections of whipstock drill pipes 1, in the natural state, the control members 1-4 in the through holes of each section of whipstock drill pipe 1 are located in the same vertical plane, that is, no matter how each control member 1-4 bends, each control member 1-4 is always located in the same vertical plane.

[0037] In the natural state, a continuous and cylindrical coring cavity is formed inside the whipstock drill pipe 1, 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 directional whipstock continuous coring drill of the present invention further includes a wireline coring device installed in the coring cavity. The wireline coring device includes a core barrel 4-1 and a limiting mechanism 4-2 connected to the upper end of the core barrel 4-1. The core barrel 4-1 is directly or indirectly fixedly connected to the limiting mechanism 4-2. For example, an upper guide pipe is fixed to the upper end of the core barrel 4-1, and the upper guide pipe is threadedly connected to the limiting mechanism 4-2. The core barrel 4-1 is used to store the core. The core barrel 4-1 has a certain strength and can be deformed to adapt to the attitude change of the whipstock drill pipe 1, 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 4-1 is smaller than the diameter of the coring cavity to ensure that the core barrel 4-1 can be smoothly placed into and taken out of the coring cavity. The lower end of the core barrel 4-1 is a free end and is placed on the inner wall base of the drill bit 3. For example, the core barrel 4-1 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 on the inner and outer sides of the helical skeleton through a mold. The flexible tube body of the core barrel 4-1 is generally made of a polymer material, such as the flexible tube body is rubber. The inner and outer side walls of the core barrel 4-1 are straight and smooth, and can be bent and deformed along with the attitude change of the whipstock connection structure 7. The flexible tube body keeps the core barrel 4-1 always closed to prevent the core from being exposed outside the core barrel 4-1. The limiting mechanism 4-2 is used to lower and take out the core barrel 4-1 and fix the core barrel 4-1 at an appropriate position. A fishing head 4-2-1 is provided at the top of the limiting mechanism 4-2. The fishing head 4-2-1 is used to lower the wireline coring device into the coring cavity and fix it. The fishing head 4-2-1 is generally a conical head, and the fishing head 4-2-1 can be fished and released by a fishing tool. A lug 4-2-2 for engaging with a slot on the inner side of the straight drill pipe 5 or a slot on the inner side of the whipstock drill pipe 1 is provided on the outer periphery of the limiting mechanism 4-2. Generally, there are two lugs 4-2-2 and they are symmetrically arranged. The lugs 4-2-2 are equipped with components such as a rotating shaft and a spreading spring. The spreading spring can make the lugs 4-2-2 spread, and the rotating shaft can make the lugs 4-2-2 rotate.

[0038] To facilitate the sliding and taking out of the wireline coring device in the coring cavity, at least one sliding seat 4-3 is provided on the outer side of the core barrel 4-1. The sliding seats 4-3 are arranged in a ring shape. The sliding seats 4-3 are provided with ball grooves, and balls 4-4 are installed in the ball grooves. The balls 4-4 are in rolling fit with the cavity wall of the coring cavity. To facilitate the lowering of the core barrel 4-1, a guide pipe 4-5 is fixedly connected to the lower end of the core barrel 4-1, and sliding seats 4-3 and balls 4-4 are provided on the outer side of the guide pipe 4-5. For example, see Figure 1 and Figure 2A circle of slides 4-3 are respectively arranged at the upper and lower ends of the core tube 4-1, and a circle of slides 4-3 includes at least three slides 4-3. The guide tube 4-5 at the lower end of the core tube 4-1 can also prevent the core tube 4-1 from rotating synchronously when the hollow motor 2 rotates. In order to facilitate the lowering of the core tube 4-1 into the core cavity, a conical cutout is arranged on the outer side of the lower end of the guide tube 4-5 at the lower end of the core tube 4-1, such as Figure 1 and Figure 4 The upper end of the core tube 4-1 can be directly connected to the limit mechanism 4-2, and an upper guide tube can also be provided at the upper end of the core tube 4-1, the upper guide tube is connected to the limit mechanism 4-2, and a circle of sliding seats 4-3 are provided on the outer periphery of the upper guide tube, for example, see Figure 1 and Figure 2 .

[0039] The second subject of the present invention is a directional deflection continuous coring method, which utilizes the directional deflection continuous coring drill tool described in the first subject to perform drilling and coring, and includes the following steps.

[0040] S1. The upper end of the straight drill rod 5 is fixedly connected to the orifice drill rig, the lower end of the straight drill rod 5 is fixedly connected to the upper joint pipe 1-1 of the uppermost deflection drill rod 1, and the rope coring device is placed in the coring cavity and fixed.

[0041] The straight drill rod 5 is a hollow rod, and the straight drill rod 5 can produce a small bending deformation under the action of external force. The upper and lower ends of the straight drill rod 5 are respectively provided with mutually compatible threaded interfaces. According to the depth of the drill hole, the number of straight drill rods 5 is one or more. When there are multiple straight drill rods 5, each of them is connected in a through-connection manner. The straight drill rod 5 mainly transmits tension and pressure. The wires 1-6 of the deflection motor 1-5 and the wires of the hollow motor 2 can pass through the straight drill rod 5 and pass out of the hole from the upper end of the straight drill rod 5, or they can be located on the outside of the straight drill rod 5 and pass out of the hole, for example, see Figure 1 and Figure 4 The straight drill rod 5 also forms a channel for drilling slurry circulation and rope coring. The outer diameter of the straight drill rod 5 is less than or equal to the outer diameter of the deflection drill rod 1, and the inner diameter of the straight drill rod 5 is equal to the diameter of the coring cavity. In order to facilitate the positioning of the direction of the straight drill rod 5, the outer wall of the straight drill rod 5 is preferably provided with vertical stripes.

[0042] To facilitate the fixation and extraction of the wireline coring device, a card slot for cooperating with the wireline coring device is provided inside the straight drill pipe 5 directly connected to the whipstock drill pipe 1; alternatively, a card slot for cooperating with the wireline coring device is provided inside the whipstock drill pipe 1. The wireline coring device includes a core barrel 4-1 and a limiting mechanism 4-2 connected to the upper end of the core barrel 4-1. A fishing head 4-2-1 is provided at the top of the limiting mechanism 4-2, and a lug 4-2-2 is provided on the outer periphery of the limiting mechanism 4-2. After the wireline coring device is placed in the core chamber, the lug 4-2-2 automatically snaps into the card slot. For example, the lug 4-2-2 automatically snaps into the card slot inside the straight drill pipe 5, as Figure 1 shown.

[0043] S2. Control the whipstock drill pipe 1 to be straight or bent by the whipstock motor 1-5, then apply pressure to the straight drill pipe 5 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 core barrel 4-1 of the wireline coring device, stop drilling, take out the wireline coring device and obtain the core.

[0044] 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 5, the whipstock drill pipe 1, the hollow motor 2 and the drill bit 3 coincide; during directional drilling, adjust the attitude of the whipstock drill pipe 1 through the whipstock motor 1-5, and the whipstock drill pipe 1 is bent.

[0045] S3. Place the wireline coring device in the core chamber and fix it, and repeat step S2 until drilling reaches the target position.

[0046] To control the actual drilling trajectory to be consistent with the predetermined drilling trajectory, before placing the wireline coring device in the core chamber in step S3, place a borehole inclinometer in the core chamber and test the drilling trajectory from the orifice to the bottom of the hole, and accordingly adjust the attitude of the whipstock drill pipe 1 through the whipstock motor 1-5. Compare the tested drilling trajectory with the designed drilling trajectory. When the drilling direction deviates, adjust the forward or reverse rotation of the whipstock motor 1-5 to increase or decrease the bending degree of the whipstock drill pipe accordingly, so as to correct the drilling direction during drilling.

Claims

1. Directional deflecting continuous coring drill tool, comprising a deflecting drill pipe (1), a hollow motor (2) and a drill bit (3), the deflecting drill pipe (1) being one or more sections, characterized in that: Set the central axis of the whipstock drill pipe (1) to be vertical. The whipstock drill pipe (1) 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). When the whipstock drill pipe (1) has multiple sections, each section of the whipstock drill pipe (1) is connected in series. The lower joint pipe (1-3) of the lowermost whipstock drill pipe (1) is connected to a hollow motor (2), and 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 whipstock drill pipe (1), 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 helically winding steel bars. The skeleton is provided with a through hole along the axial direction of the spring tube (1-2), and a push-pull member (1-4) is arranged in the through hole. The push-pull member (1-4) is a push-pull rod or a pull rope. The lower end of the push-pull member (1-4) is fixedly connected or abutted to the lower joint pipe (1-3). An inclinometer motor (1-5) is fixedly installed on the upper joint pipe (1-1). The output end of the inclinometer motor (1-5) is connected to the upper end of the push-pull member (1-4) through a transmission structure, and the transmission structure is used to convert the rotational motion of the output end of the inclinometer motor (1-5) into a linear motion of the push-pull member (1-4) along its axial direction.

2. The directional whipstock continuous coring drill tool according to claim 1, wherein: The upper joint pipe (1-1) is provided with a cavity in the pipe wall, and the inclinometer motor (1-5) is fixedly installed in the cavity in the pipe wall.

3. The directional deviation-continuous coring drill tool according to claim 1, characterized in that: The exposed section of the rotating shaft of the inclinometer motor (1-5) is provided with a threaded interface, and the upper end of the push-pull member (1-4) is provided with a matching threaded interface. The rotating shaft of the inclinometer motor (1-5) is threadedly connected to the upper end of the push-pull member (1-4).

4. The deflecting and continuous coring drill tool according to claim 1, wherein: The skeleton of the spring tube (1-2) is tightly wound with steel bars, and the push-pull member (1-4) is a steel bar; or, the skeleton of the spring tube (1-2) is wound with steel bars at intervals, and the push-pull member (1-4) is a steel bar or a steel wire rope.

5. The directional deviation-continuous coring drill tool according to claim 1, characterized in that: The whipstock drill pipe (1) has at least two sections, and the push-pull members (1-4) in the through holes of each section of the whipstock drill pipe (1) are located in the same vertical plane.

6. The directional deviation-continuous coring drill tool according to claim 1, wherein: 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, and 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 is fixedly connected to the lower joint pipe (1-3) of the lowermost whipstock drill pipe (1). 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). A sealing ring (2-5) and a bearing (2-6) are arranged 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).

7. The directional deviation-continuous coring drill tool according to any one of claims 1 to 6, characterized in that: The directional deviation continuous coring drill tool further includes a wireline coring device installed in the coring cavity. The wireline coring device includes a coring tube (4-1) and a limiting mechanism (4-2) connected to the upper end of the coring tube (4-1). The coring tube (4-1) includes a flexible tube body and a framework embedded in the flexible tube body. The framework is a helical steel wire. A fishing head (4-2-1) is provided at the top of the limiting mechanism (4-2), and a clamping ear (4-2-2) for clamping with a card slot inside the straight drill pipe (5) or a card slot inside the deflecting drill pipe (1) is provided on the outer periphery of the limiting mechanism (4-2).

8. The directional deviation-continuous coring drill tool according to claim 7, wherein: At least one sliding seat (4-3) is arranged on the outer side of the coring tube (4-1). The sliding seat (4-3) is provided with a ball groove, and balls (4-4) are installed in the ball groove. The balls (4-4) are in rolling fit with the wall of the coring cavity; the lower end of the coring tube (4-1) is fixedly connected to a guide tube (4-5), and sliding seats (4-3) and balls (4-4) are provided on the outer side of the guide tube (4-5).

9. The method for directional build-up continuous coring, characterized in that When drilling and coring using any of the above directional deviation continuous coring drill tools, the following steps are included: S1. Fix the upper end of the straight drill pipe (5) to the orifice drill rig, and fix the lower end of the straight drill pipe (5) to the upper joint pipe (1-1) of the uppermost deflecting drill pipe (1). Place the wireline coring device into the coring cavity and fix it; S2. Control the deflecting drill pipe (1) to be in a straight or curved shape through the deflecting motor (1-5). Then apply pressure to the straight drill pipe (5) 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 (4-1) 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.

10. The directional deviation continuous coring method according to claim 9, wherein: A card slot is provided inside the lower end of the straight drill pipe (5) or inside the deflecting drill pipe (1); the wireline coring device includes a coring tube (4-1) and a limiting mechanism (4-2) connected to the upper end of the coring tube (4-1). A fishing head (4-2-1) is provided at the top of the limiting mechanism (4-2), and a clamping ear (4-2-2) is provided on the outer periphery of the limiting mechanism (4-2). After the wireline coring device is placed into the coring cavity, the clamping ear (4-2-2) automatically snaps into the card slot; before step S3 places the wireline coring device into the coring cavity, place a borehole inclinometer into the coring cavity and test the drilling trajectory from the orifice to the bottom of the hole, and adjust the attitude of the deflecting drill pipe (1) through the deflecting motor (1-5) accordingly.

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