Directional deflecting wire-line coring drilling device and method

Abstract

The invention discloses a directional deflecting wire-line coring drilling device 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 deflecting rope coring drilling device comprises a deflecting drill rod, a hollow motor and a drill bit, the deflecting drill rod 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 rod, 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, or the spring pipe comprises the flexible pipe body and the framework embedded into the flexible pipe body, the framework is formed by spirally winding reinforcing steel bars, and a first through hole is formed between the two ends of the framework. A control piece is arranged in the first through hole in a penetrating mode, and a fixing belt used for preventing the framework from generating axial compression is further arranged between the two ends of the framework. The invention is used for linear drilling and directional drilling.

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 deflecting wireline coring drilling device and method. Background Art

[0002] Common engineering drilling means are vertical drilling, inclined drilling, and horizontal drilling. These three types of drilling technologies 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 deflection, 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, it is necessary to carry out curved drilling across rivers or along the axis of hydraulic tunnels, and gradually the research on directional coring technology that can bend during drilling has begun.

[0003] The technology that can perform curved drilling has achieved certain development in the field of petroleum engineering exploration. However, petroleum engineering exploration belongs to non-core-taking drilling, which is essentially different from the drilling that requires taking cores in projects such as water conservancy and hydropower, and its technology cannot be applied to the drilling that requires taking cores.

[0004] Currently, the existing directional deflecting coring drilling devices mainly achieve directional deflecting coring drilling by adding eccentric components outside the drill pipe. The eccentric components have protruding parts that push against the hole wall of the borehole, and the reaction force of the hole wall causes the rigid drill pipe to bend slightly, thereby achieving directional deflecting coring drilling. This directional deflecting coring drilling device has many problems, mainly including: First, the eccentric components are coaxial with the drill pipe. During the lowering of the drill pipe, the eccentric components rotate synchronously with the drill pipe. Due to the lack of measures for positioning and controlling the direction of the eccentric components, it is difficult to ensure that the protruding parts are located at the preset positions, resulting in incorrect bending directions of the drill pipe. Second, the volume of the eccentric components is relatively large. In engineering drilling, cores also need to be taken, and the eccentric components result in extremely small coring channels. Third, the structure of the eccentric components is complex. Since the drilling that requires taking cores is water drilling, the eccentric components are easily damaged in the drilling environment of water, rock cuttings, mud, etc. Fourth, during the drilling process, the protruding parts of the eccentric components continuously rub against the hole wall, and the contact parts are easily damaged. Fifth, the length of the protruding parts of the eccentric components is limited, the deflecting amplitude is small, and the deflecting 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 in the drill pipe for directional deflecting drilling, resulting in low core recovery rate and easy fracture and damage of the cores. Summary of the Invention

[0005] The present invention first provides a directional deflecting wireline coring drilling device to solve the problems of difficult control of the deflecting direction of the existing drilling devices and low core recovery rate.

[0006] The technical solution adopted by the present invention is: a directional deviation coring device for wireline coring, which includes a deviation drill pipe, a hollow motor and a drill bit. It is set that the central axis of the deviation drill pipe is vertical. The deviation 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 spring tube includes a skeleton and a flexible tube body fixed on at least one of the inner and outer sides of the skeleton, or 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 helically winding steel bars at intervals. There is a first through hole between the upper and lower ends of the skeleton, and a control member is inserted into the first through hole. The control member is a pull rod or a pull rope. The lower end of the control member is fixedly connected to the lower joint tube, and the upper end of the control member passes out of the upper end of the first through hole; there is also a fixing belt between the upper and lower ends of the skeleton to prevent the skeleton from axial compression. The center line of the fixing belt, the center line of the first through hole and the center line of the spring tube are coplanar; the lower joint tube of the deviation 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, and a continuous and cylindrical coring cavity is formed inside the deviation drill pipe, the hollow motor and the drill bit.

[0007] Whether it is the flexible tube body of the spring tube or the flexible tube body of the coring tube, it plays at least one of the roles of preventing the skeleton from being worn, isolating the inner and outer sides of the skeleton, and forming a smooth surface. Specifically: the flexible tube body is formed by injecting plastic into the inner and outer sides of the skeleton and the gaps; or, the flexible tube body includes an inner tube and an outer tube, the inner tube is fixed to the inner side of the skeleton, the outer tube is fixed to the outer side of the skeleton, and both the inner tube and the outer tube are stainless steel braided tubes.

[0008] The fixing belt is used to prevent axial compression on the side of the skeleton away from the first through hole, and at the same time can also adapt to the bending deformation of the spring tube. The fixing belt can be a structure or a part. Specifically: there is a second through hole between the upper and lower ends of the skeleton of the spring tube, and a ejector rod is inserted into the second through hole. The upper end of the ejector rod is connected or abutted to the upper joint tube, and the lower end of the ejector rod is connected or abutted to the lower joint tube; or; there is a second through hole between the upper and lower ends of the skeleton of the spring tube, and a connecting rib is inserted into the second through hole. The upper and lower ends of the connecting rib are respectively fixedly connected to the upper joint tube and the lower joint tube, and a limiting block is arranged between adjacent two circles of steel bars of the skeleton, and the connecting rib passes through the limiting block; or, there is a fixing rod between the upper and lower ends of the skeleton of the spring tube, and the fixing rod is fixedly connected to each circle of steel bars of the skeleton.

[0009] In order to keep the limiting block stable with the skeleton, further: arc-shaped grooves are respectively arranged at the top and bottom of the limiting block, and the steel bars of the skeleton are stuck in the arc-shaped grooves, and the limiting block is in an H shape in the cross section passing through the center line of the spring 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 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 coring chamber is used to place the wireline coring device to obtain the core. Further: The directional whipstock wireline coring drilling device further 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, or the coring tube includes a skeleton and a flexible tube body fixed to at least one of the inner and outer sides of the skeleton. The skeleton is a spring-shaped pipe fitting formed by helically winding steel bars. 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 for engaging with a card slot on the inner side of the straight drill pipe or with a card slot on the inner side of the whipstock drill pipe.

[0012] 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 fit with the inner wall of the coring chamber; a guide tube is fixedly connected to the lower end of the coring tube, and sliding seats and balls are provided on the outer side of the guide tube.

[0013] The present invention also provides a directional whipstock wireline coring drilling method, 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 for the directional whipstock wireline coring drilling device method, the above-mentioned any directional whipstock wireline coring drilling device is used for drilling and coring, including the following steps: S1. Fix the upper end of the straight drill pipe to the hole-opening drilling rig, fix the lower end of the straight drill pipe to the upper joint pipe of the whipstock drill pipe, and place the wireline coring device in the coring chamber and fix it.

[0014] To facilitate the fixing and extraction of the wireline coring device, further: A card slot is provided on the inner side of the lower end of the straight 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 lug is provided on the outer periphery of the limiting mechanism. After the wireline coring device is placed in the coring chamber, the lug automatically snaps into the card slot.

[0015] S2. Pull the control member to make the whipstock drill pipe bent; or, set a limiting block between two adjacent rings of steel bars of the framework, the control member penetrates through the limiting block, and the limiting block abuts against each ring of steel bars of the framework to make the whipstock drill pipe straight; or, replace the whipstock drill pipe with a straight drill pipe; then apply pressure to the straight drill pipe through the orifice drill rig and drive the drill bit to rotate by using the hollow motor to make the drill bit break through the rock for drilling; when the core fills the core barrel of the wireline coring device, stop drilling, take out the wireline coring device and obtain the core.

[0016] S3. Place the wireline coring device into the core chamber and fix it, and repeat step S2 until drilling reaches the target position.

[0017] In order to control the actual drilling trajectory to be consistent with the predetermined drilling trajectory, further: before placing the wireline coring device into the core chamber in step S3, place a borehole inclinometer into the core chamber and test the drilling trajectory from the orifice to the bottom of the hole, and adjust the whipstock drilling process accordingly.

[0018] The beneficial effects of the present invention are as follows: the upper end of the control member is led out from the borehole. By pulling the upper end of the control member, the side of the spring tube provided with the first through hole is correspondingly shortened, and the side of the spring tube provided with the fixing band cannot be shortened, so that the whipstock drill pipe is bent to achieve the purpose of directional whipstock drilling. After being bent, the spring tube is in an arc shape, with little influence on the coring operation, reducing the risk of core fracture, facilitating the coring operation and increasing the core recovery rate. By operating the upper end of the control member, the attitude of the whipstock drill pipe can be adjusted. The operation is simple and the attitude is stable.

[0019] The hollow motor is located at the lower end of the whipstock drill pipe. The hollow motor is of a hollow tubular structure and has no influence 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 orifice drill 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 whipstock 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 whipstock drill pipe, the hollow motor and the drill bit are lifted out. The whole drilling process is simple to operate and has a low implementation cost. Description of the Drawings

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

[0022] Figure 2 is Figure 1 a schematic diagram of the cross section A-A of the shown embodiment.

[0023] Figure 3 isFigure 1 Schematic diagram of the illustrated embodiment in the B-B 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: deflecting drill pipe 1, upper joint pipe 1-1, spring pipe 1-2, lower joint pipe 1-3, control member 1-4, connecting rib 1-5, limit block 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

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

[0027] The first theme of the present invention is a directional deflecting wireline coring drilling device. Refer to Figure 1 and Figure 4 , the directional deflecting wireline coring drilling device includes a deflecting drill pipe 1, a hollow motor 2 and a drill bit 3. The directional deflecting wireline coring drilling device has two states, namely the natural state and the directional drilling state. In the natural state, the central axis of the deflecting drill pipe 1 is a straight line. Refer to Figure 1 ; in the directional drilling state, the central axis of the deflecting 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 deflecting drill pipe 1 is a straight line and vertical. The deflecting drill pipe 1 includes a spring pipe 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 pipe 1-2 respectively. The upper joint pipe 1-1 of the deflecting drill pipe 1 is used to connect with the straight drill pipe 5, and the lower joint pipe 1-3 of the deflecting drill pipe 1 is connected to the hollow motor 2. In order to facilitate the connection of the upper and lower ends of the deflecting drill pipe 1 with the straight drill pipe 5 and the hollow motor 2 respectively, the upper joint pipe 1-1 and the lower joint pipe 1-3 are adapted to each other. For example, the two ends of the deflecting 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. The upper and lower ends of the deflecting drill pipe 1 can be interchanged.

[0028] The deflection drill rod 1 is a hollow circular tube structure with both ends open. The main part of the deflection drill rod 1 is a spring tube 1-2, which includes a flexible tube body and a skeleton embedded in the flexible tube body. The skeleton is a spring-shaped tube formed by spirally winding steel bars, that is, a reserved gap between two adjacent circles of steel bars. The flexible tube body plays at least one of the following roles: avoiding skeleton wear, isolating the inside and outside of the skeleton, forming a smooth surface, and closing the gap of the skeleton. The flexible tube body is arranged on the inside or outside of the skeleton, or on the inside and outside of the skeleton at the same time. When the flexible tube body is only arranged on the inside of the skeleton, the inner wall of the spring tube 1-2 is flat; when the flexible tube body is only arranged on the outside of the skeleton, the outer wall of the spring tube 1-2 is flat; when the flexible tube body is arranged on the outside and outside of the skeleton, the inner and outer walls of the spring tube 1-2 are flat. The flexible tube body is generally combined with the skeleton by injection molding to form a complete spring tube 1-2. The flexible tube body is generally a polymer material and has good wear resistance, for example, the flexible tube body is rubber.

[0029] Another embodiment of the spring tube 1-2 of the deflection drill pipe 1 is provided below. The spring tube 1-2 includes a skeleton and a flexible tube body fixed to at least one of the inner and outer sides of the skeleton. The skeleton is consistent with the skeleton in the above embodiment. At this time, the spring tube 1-2 is a double-layer structure or a three-layer structure. For example, the flexible tube body includes an inner tube and an outer tube, the inner tube is fixed to the inner side of the skeleton, and the outer tube is fixed to the outer side of the skeleton. The inner tube and the outer tube are both stainless steel braided tubes. The stainless steel braided mesh layer is fixed to the inner and outer sides of the skeleton, and the upper and lower ends of the stainless steel braided mesh layer are preferably fixedly connected to the upper joint tube 1-1 and the lower joint tube 1-3. The stainless steel braided mesh layer can produce synchronous deformation when the skeleton is bent and deformed. The stainless steel braided mesh layer on the outer side of the skeleton can also withstand the friction with the borehole wall during drilling, reducing the wear of the skeleton. The stainless steel braided mesh layer also plays an isolation role to prevent the internal and external substances of the skeleton from moving in the gap of the spring tube.

[0030] A first through hole is provided between the upper and lower ends of the frame of the spring tube 1-2. In a natural state, the center line of the first through hole is a straight line and parallel to the center line of the spring tube 1-2. The first through hole is generally located in the middle of the frame, that is, the center line of the steel bars that the first through hole passes through to form the frame. Figure 1 , Figure 2 and Figure 4 The first through hole is provided with a control member 1-4, which is a push-pull rod or a pull rope. The lower end of the control member 1-4 is fixedly connected to the lower joint tube 1-3, and the upper end of the control member 1-4 passes through the upper end of the first through hole and extends to the outside of the borehole during drilling. The control member 1-4 is used to adjust the posture of the spring tube 1-2. After the control member 1-4 is pulled, the spring tube 1-2 is bent, such as Figure 4 shown.

[0031] A fixing band for preventing axial compression of the framework is also provided between the upper and lower ends of the framework of the bourdon tube 1-2. The fixing band is used to prevent axial compression on the side of the framework away from the first through hole, so that the framework of the bourdon tube 1-2 bends after the control member 1-4 is pulled. To facilitate the bending of the bourdon tube 1-2 after the control member 1-4 is pulled, the center line of the fixing band, the center line of the first through hole, and the center line of the bourdon tube 1-2 are coplanar. The fixing band can be a structure or a part.

[0032] For example, a second through hole is provided between the upper and lower ends of the framework of the bourdon tube 1-2, and a push rod is inserted through the second through hole. The upper end of the push rod is connected or abutted to the upper joint pipe 1-1, and the lower end of the push rod is connected or abutted to the lower joint pipe 1-3. The push rod directly supports the upper joint pipe 1-1 and the lower joint pipe 1-3. The push rod and the framework can be fixed, for example, by welding, or not fixed.

[0033] For another example, referring to Figure 1 and Figure 4 A second through hole is provided between the upper and lower ends of the framework of the bourdon tube 1-2, and a connecting rib 1-5 is inserted through the second through hole. The upper and lower ends of the connecting rib 1-5 are respectively fixedly connected to the upper joint pipe 1-1 and the lower joint pipe 1-3. A limiting block 1-6 is provided between adjacent two rings of steel bars of the framework, and the connecting rib 1-5 penetrates through the limiting block 1-6. The connecting rib 1-5 mainly functions to fix the limiting block 1-6, and the limiting block 1-6 can also be directly welded and fixed to each ring of steel bars forming the framework. To keep the limiting block 1-6 stable with respect to the framework, arc-shaped grooves are respectively provided at the top and bottom of the limiting block 1-6, and the steel bars of the framework are clamped in the arc-shaped grooves. The limiting block 1-6 is in an H shape in the cross section passing through the center line of the bourdon tube 1-2. After the limiting block 1-6 is relatively fixed to the framework of the bourdon tube 1-2, a flexible tube body is formed by an injection molding method; or, after the limiting block 1-6 is relatively fixed to the framework of the bourdon tube 1-2, the inner tube and the outer tube of the flexible tube body are fixed to the framework.

[0034] For another example, a fixing rod is provided between the upper and lower ends of the framework of the bourdon tube 1-2, and the fixing rod is fixedly connected to each ring of steel bars of the framework. The fixing rod is non-compressible, so that the framework of the bourdon tube 1-2 cannot be axially compressed on the side provided with the fixing band.

[0035] The lower joint pipe 1-3 of the whipstock drill pipe 1 is connected to the hollow motor 2, and 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, and at the same time, the middle part of the hollow motor 2 is a hollow structure to avoid affecting coring. Referring 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 provided between the stator 2-1 and the rotor 2-2. The stator 2-1 is a hollow tubular structure. The inner diameter of the stator 2-1 is the same as the inner diameter 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 provided 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 withstand 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 the rock. The drill bit 3 is a hollow circular tube structure. The function of the drill bit 3 is to grind the rock to separate the rock inside and outside the drill bit 3.

[0036] 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 a wireline coring device to obtain the core. The directional whipstock wireline coring drilling device 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, ensuring that the core barrel 4-1 can be smoothly placed into and removed from 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 the flexible tube body is formed by injection molding inside and outside 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. For another example, the core barrel 4-1 includes a skeleton and a flexible tube body fixed to at least one of the inner and outer sides of the skeleton. The flexible tube body is a stainless steel braided tube. For another example, the flexible tube body of the core barrel 4-1 includes an inner tube and an outer tube. The inner tube is fixed to the inner side of the skeleton, and the outer tube is fixed to the outer side of the skeleton. Both the inner tube and the outer tube are stainless steel braided tubes. The inner and outer walls of the core barrel 4-1 are preferably straight and smooth, and the core barrel 4-1 can bend and deform along with the attitude change of the whipstock drill pipe 1. The flexible tube body keeps the core barrel 4-1 always closed, preventing the core from being exposed outside the core barrel 4-1.

[0037] The limiting mechanism 4-2 of the wireline coring device is used to lower and remove 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. There are generally 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 an opening spring. The opening spring can make the lugs 4-2-2 open, and the rotating shaft can make the lugs 4-2-2 rotate.

[0038] In order to facilitate the sliding and removal of the rope coring device in the coring cavity, at least one slide 4-3 is arranged on the outside of the coring tube 4-1. The slide 4-3 is arranged in a ring shape, and the slide 4-3 is provided with a ball groove. The ball 4-4 is installed in the ball groove. The ball 4-4 rolls with the cavity wall of the coring cavity. In order to facilitate the lowering of the coring tube 4-1, the lower end of the coring tube 4-1 is fixedly connected to the guide tube 4-5, and the slide 4-3 and the ball 4-4 are arranged on the outside of the guide tube 4-5. For example, see Figure 1 and Figure 4 A circle of slides 4-3 are respectively arranged at the upper and lower ends of the coring 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 coring tube 4-1 can also prevent the coring tube 4-1 from rotating synchronously when the hollow motor 2 rotates. In order to facilitate the lowering of the coring tube 4-1 into the coring 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 coring tube 4-1. The upper end of the coring tube 4-1 can be directly connected to the limiting mechanism 4-2, and an upper guide tube can also be arranged on the upper end of the coring tube 4-1, and the upper guide tube is connected to the limiting mechanism 4-2. A circle of slides 4-3 is arranged on the outer periphery of the upper guide tube, for example, see Figure 1 and Figure 4 .

[0039] The second subject of the present invention is a directional deflection wireline coring drilling method. The directional deflection wireline coring drilling device method uses the directional deflection wireline coring drilling device 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 hole drilling rig, the lower end of the straight drill rod 5 is fixedly connected to the upper joint pipe 1-1 of the 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 drilling 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 control component 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 outside 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 lower end of the straight drill pipe 5 directly connected to 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 and Figure 4 shown.

[0043] S2. Control the whipstock drill pipe 1 to be bent or straight, 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, the attitude of the whipstock drill pipe 1 is adjusted by the whipstock motor, and the whipstock drill pipe 1 is bent.

[0045] Lift the upper end of the lifting control member 1-4, and the whipstock drill pipe 1 is bent. Change the control member 1-4 to a fixing band. For example, insert a limiting block 1-6 between adjacent turns of steel bars of the skeleton of the spring tube 1-2. The limiting block 1-6 is provided with a through hole in the vertical direction, and the control member 1-4 passes through the limiting block 1-6. The limiting block 1-6 abuts against each turn of steel bars of the skeleton to make the central axis of the whipstock drill pipe 1 straight. In addition, the whipstock drill pipe 1 can be replaced with the straight drill pipe 5 to achieve straight drilling.

[0046] S3. Place the wireline coring device into the core chamber and fix it, and repeat step S2 until drilling reaches the target position.

[0047] To control the actual drilling trajectory to be consistent with the predetermined drilling trajectory, before placing the wireline coring device into the core chamber in step S3, place a borehole inclinometer into the core chamber and test the drilling trajectory from the orifice to the bottom of the hole, and adjust the attitude of the whipstock drill pipe 1 accordingly. Compare the tested drilling trajectory with the designed drilling trajectory. When the drilling direction deviates, by adjusting the lifting length of the control member, the bending degree of the whipstock drill pipe 1 is increased or decreased accordingly, so as to correct the drilling direction during drilling.

Claims

1. The directional whipstock coring drilling device comprises a whipstock drill pipe (1), a hollow motor (2) and a drill bit (3), and is 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 tube (1-1) and a lower joint tube (1-3) fixedly connected to the upper and lower ends of the spring tube (1-2). The spring tube (1-2) includes a skeleton and a flexible tube body fixed to at least one of the inner and outer sides of the skeleton, or 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 at intervals. There is a first through hole between the upper and lower ends of the skeleton. A control member (1-4) is inserted into the first through hole. The control member (1-4) is a pull rod or a pull rope. The lower end of the control member (1-4) is fixedly connected to the lower joint tube (1-3), and the upper end of the control member (1-4) passes out of the upper end of the first through hole; there is also a fixing belt between the upper and lower ends of the skeleton to prevent the skeleton from being axially compressed. The center line of the fixing belt, the center line of the first through hole, and the center line of the spring tube (1-2) are coplanar; the lower joint tube (1-3) of the whipstock drill pipe (1) 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 core-taking cavity is formed inside the whipstock drill pipe (1), the hollow motor (2), and the drill bit (3).

2. The wireline coring directional deviation drilling device according to claim 1, wherein: The flexible tube body is formed by gap injection molding on the inner and outer sides of the skeleton; or, the flexible tube body includes an inner tube and an outer tube. The inner tube is fixed to the inner side of the skeleton, and the outer tube is fixed to the outer side of the skeleton. Both the inner tube and the outer tube are stainless steel braided tubes.

3. The wireline coring directional deviation drilling device according to claim 1, characterized in that: There is a second through hole between the upper and lower ends of the skeleton of the spring tube (1-2). A push rod is inserted into the second through hole. The upper end of the push rod is connected or abutted to the upper joint tube (1-1), and the lower end of the push rod is connected or abutted to the lower joint tube (1-3); or, there is a second through hole between the upper and lower ends of the skeleton of the spring tube (1-2). A connecting rib (1-5) is inserted into the second through hole. The upper and lower ends of the connecting rib (1-5) are respectively fixedly connected to the upper joint tube (1-1) and the lower joint tube (1-3). There are limiting blocks (1-6) between adjacent turns of steel bars of the skeleton, and the connecting rib (1-5) passes through the limiting blocks (1-6); or, there is a fixing rod between the upper and lower ends of the skeleton of the spring tube (1-2), and the fixing rod is fixedly connected to each turn of steel bars of the skeleton.

4. The wireline coring directional deviation drilling device according to claim 3, wherein: Arc-shaped grooves are respectively arranged at the top and bottom of the limiting block (1-6). The steel bars of the skeleton are clamped in the arc-shaped grooves. The limiting block (1-6) is in an H shape in the cross section passing through the center line of the spring tube (1-2).

5. The wireline coring directional deviation drilling device 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, and both the upper and lower ends of the stator (2-1) are open. A stator connector (2-3) is provided at the upper end of the stator (2-1) and is fixedly connected to the lower connector pipe (1-3) of the deflecting drill pipe (1). 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 directional deflecting drilling device according to any one of claims 1 to 5, characterized in that: The directional deflecting wireline coring drilling device 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 skeleton embedded in the flexible tube body, or the coring tube (4-1) includes a skeleton and a flexible tube body fixed to at least one of the inner and outer sides of the skeleton. The skeleton is a spring-shaped pipe fitting formed by helically winding steel bars. 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 on the inner side of the straight drill pipe (5) or a card slot on the inner side of the deflecting drill pipe (1) is provided on the outer periphery of the limiting mechanism (4-2).

7. The wireline coring directional deviation drilling device according to claim 6, characterized in that: At least one sliding seat (4-3) is provided 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 cavity 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).

8. The method of the wireline coring drilling device for directional deviation control is characterized in that: Using the directional deflecting wireline coring drilling device according to any one of the above claims 1 to 7 for drilling and coring, includes the following steps: S1. Fix the upper end of the straight drill pipe (5) to the orifice drill rig, fix the lower end of the straight drill pipe (5) to the upper connector pipe (1-1) of the deflecting drill pipe (1), and place the wireline coring device into the coring cavity and fix it; S2. Lift the control member (1-4) to make the deflecting drill pipe (1) bent; or, a limiting block (1-6) is provided between adjacent two turns of steel bars of the skeleton, the control member (1-4) passes through the limiting block (1-6), and the limiting block (1-6) abuts against each turn of steel bars of the skeleton to make the deflecting drill pipe (1) straight; or, replace the deflecting drill pipe (1) with the straight drill pipe (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 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.

9. The directional whipstock core drilling device method according to claim 8, characterized in that: A clamping groove is provided inside the lower end of the straight drill pipe (5). 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 clamping ears (4-2-2) are provided on the outer periphery of the limiting mechanism (4-2). After the wireline coring device is placed in the coring cavity, the clamping ears (4-2-2) automatically snap into the clamping groove.

10. The directional deflecting wireline coring drilling device method according to claim 8 or 9, characterized in that: Before the wireline coring device is placed in the coring cavity in step S3, a borehole inclinometer is placed in the coring cavity and the borehole trajectory from the hole mouth to the hole bottom is tested, and the directional drilling process is adjusted accordingly.

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