Drilling anti-drag jam releasing tool and drilling anti-drag method

Abstract

The invention discloses a drilling drag reduction and jam release tool and a drilling drag reduction method. The resistance-reducing and jam-releasing tool for well drilling can be connected with a drill column and comprises a pipe body, an electromagnetic driving device, a magnetic pushing and shooting sliding block, a plurality of blades and a plurality of limiting sliding blocks. The blades are circumferentially distributed on the outer wall of the pipe body, a plurality of slope baffles corresponding to the blades are circumferentially arranged on the outer side wall of the pipe body, and at least one group of ball structures are arranged on the outer side edges of the blades; the pipe body is sleeved with the magnetic pushing and shooting sliding blocks, and the two ends of the blades are hinged to the magnetic pushing and shooting sliding blocks and the corresponding limiting sliding blocks correspondingly; the electromagnetic driving device can drive the magnetic pushing and shooting sliding block to axially slide; the magnetic pushing and shooting sliding block can push the multiple blades and the limiting sliding block to axially slide, the slope baffles are located on the sliding strokes of the corresponding blades so that the blades can be jacked outwards till the ball structures abut against the well wall, the contact area of the drill column and the well wall is reduced, sliding friction is converted into rolling friction, friction resistance between the small drill column and the well wall is reduced, and the service life of the drill column is prolonged. And the drilling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas, and particularly to a drilling drag reduction and sticking releasing tool and a drilling drag reduction method. Background Art

[0002] In the business chain of geothermal energy resources and oil and gas resources development and utilization, drilling is a key link in the business chain. During the drilling process, a large drill string friction resistance will affect the drilling extension ability, drilling cycle, and even the safety of the drill string.

[0003] Currently, the main methods for reducing the drill string friction resistance include: (1) using fixed centralizers (or stabilizers) to straighten the drill string, reducing the contact area between the drill string and the wellbore wall to reduce the friction resistance, which can achieve a local reduction in friction resistance; (2) by improving the lubricity of the drilling fluid, reducing the friction coefficient between the drill string and the wellbore wall. Both of these methods for reducing the drill string friction resistance have certain limitations. Summary of the Invention

[0004] In order to enrich the product types of drilling drag reduction tools and increase the selection space for drilling drag reduction methods, embodiments of the present invention provide a drilling drag reduction and sticking releasing tool and a drilling drag reduction method.

[0005] In a first aspect, embodiments of the present invention provide a drilling drag reduction and sticking releasing tool that can be connected to a drill string, including: a pipe body, an electromagnetic driving device, a magnetic pushing slider, a plurality of blades, and a plurality of limiting sliders;

[0006] The plurality of blades are circumferentially distributed on the outer wall of the pipe body. A plurality of ramp baffles are circumferentially arranged on the outer side wall of the pipe body corresponding to the plurality of blades. At least one set of ball structures is arranged on the outer edge of the blade;

[0007] The plurality of limiting sliders are circumferentially distributed on the outer wall of the pipe body;

[0008] The magnetic pushing slider is sleeved on the pipe body. Two ends of the blade are respectively hinged to the magnetic pushing slider and the corresponding limiting slider;

[0009] The electromagnetic driving device is arranged on a side of the magnetic pushing slider away from the blade. The electromagnetic driving device can drive the magnetic pushing slider to axially slide;

[0010] The magnetic pushing slider can push the plurality of blades and the limiting sliders to axially slide. The ramp baffle is located on the sliding stroke of the corresponding blade to push the blade outwards until the ball structure abuts against the wellbore wall.

[0011] In one or some alternative embodiments, the drilling drag reduction and sticking releasing tool further includes a first elastic member and a socket member sleeved on the pipe body;

[0012] The socket part is fixedly connected to the pipe body;

[0013] Both ends of the first elastic member can respectively abut against the limit slider and the socket part;

[0014] The limit slider can compress the first elastic member under the push of the magnetic ejection slider, and after the electromagnetic driving device stops driving, the magnetic ejection slider, the plurality of blades and the limit slider reset under the elastic force of the first elastic member.

[0015] In one or some alternative embodiments, the socket part includes an abutting seat and a plurality of limit plates circumferentially distributed at one end of the abutting seat;

[0016] The end of the limit plate is provided with a receiving hole; the first elastic member passes through the receiving holes of the plurality of limit plates and abuts against the abutting seat.

[0017] In one or some alternative embodiments, the limit slider and the limit plate are arranged staggeredly;

[0018] Guide rails are respectively arranged on both side walls of the limit plate, and cooperating parts corresponding to the guide rails are respectively arranged on both side walls of the limit slider.

[0019] In one or some alternative embodiments, a slope is arranged at one end of the limit plate close to the limit slider.

[0020] In one or some alternative embodiments, the drilling drag reduction and stuck pipe releasing tool further includes a second elastic member;

[0021] The second elastic member is respectively connected to the corresponding blade and the limit slider.

[0022] In one or some alternative embodiments, the ball structure includes a ball cap, a central ball and a plurality of auxiliary balls;

[0023] The ball cap is fixed to the outer wall of the blade;

[0024] The ball cap has a central hole, the central ball is accommodated in the ball cap, and at least part of the central ball protrudes from the central hole;

[0025] The auxiliary balls are arranged between the central ball and the ball cap.

[0026] In one or some alternative embodiments, the drilling drag reduction and stuck pipe releasing tool further includes a connecting rod;

[0027] One end of the connecting rod is connected to the magnetic ejection slider, and the other end is hinged to the blade.

[0028] In one or some alternative embodiments, the blade is a bent blade, and the ramp baffle is located at the bent portion of the blade.

[0029] In one or some alternative embodiments, upper and lower joints for connecting the drill string are respectively provided at both axial ends of the pipe body;

[0030] The electromagnetic driving device is arranged inside the upper joint.

[0031] In one or some alternative embodiments, the drilling drag reduction and sticking releasing tool includes a controller electrically connected to the electromagnetic driving device;

[0032] The controller can receive ground signals and control the start and stop of the electromagnetic driving device according to the ground signals.

[0033] In one or some alternative embodiments, the electromagnetic driving device includes a power supply and an electromagnetic induction coil which are electrically connected;

[0034] The magnetic pushing slider is made of a permanent magnet material.

[0035] In a second aspect, an embodiment of the present invention provides a drilling drag reduction method, which applies the drilling drag reduction and sticking releasing tool described in the first aspect, and includes:

[0036] Connect the drilling drag reduction and sticking releasing tool to the drill string and lower it into the wellbore along with the drill string for drilling operations;

[0037] When the axial or circumferential movement of the drill string and / or the drilling drag reduction and sticking releasing tool is blocked, start the electromagnetic driving device to drive the magnetic pushing slider to push a plurality of blades and a plurality of limiting sliders to slide axially, so that the plurality of blades open under the support of the ramp baffle until the ball structure abuts against the well wall.

[0038] The beneficial effects of the above technical solutions provided in the embodiments of the present invention at least include:

[0039] The drilling drag reduction and sticking releasing tool provided in the embodiments of the present invention can, when the friction of the drill string is large, drive the magnetic pushing slider to slide through the electromagnetic driving device, thereby pushing the blade to slide. The blade can be lifted when passing through the ramp baffle, so as to reduce the contact area between the drill string and the well wall, reduce the friction between the drill string and the well wall. By arranging a ball structure on the outer edge of the blade, after the blade is lifted, the ball structure can abut against the well wall, thereby converting sliding friction into rolling friction, further reducing the friction between the drill string and the well wall, reducing the friction coefficient and the drill string friction torque, reducing the drilling difficulty of the drill string, thereby greatly improving the drilling efficiency, and reducing the risk of drill tool failure during drilling.

[0040] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the written description and the drawings.

[0041] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings are provided to further understand the present invention, and constitute a part of the description. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0043] Figure 1 is a first schematic structural view of a drilling drag reduction and stuck pipe releasing tool provided in an embodiment of the present invention;

[0044] Figure 2 is a second schematic structural view of a drilling drag reduction and stuck pipe releasing tool provided in an embodiment of the present invention;

[0045] Figure 3 is a sectional view of a drilling drag reduction and stuck pipe releasing tool provided in an embodiment of the present invention;

[0046] Figure 4 is a schematic structural view of a pipe body provided in an embodiment of the present invention;

[0047] Figure 5 is a schematic structural view of a magnetic pushing slider provided in an embodiment of the present invention;

[0048] Figure 6 is a schematic structural view of a socket provided in an embodiment of the present invention;

[0049] Figure 7 is a schematic structural view of a limit slider provided in an embodiment of the present invention;

[0050] Figure 8 is a top view of a limit slider provided in an embodiment of the present invention;

[0051] Figure 9 is a schematic structural view of a blade provided in an embodiment of the present invention;

[0052] Figure 10 is Figure 5 an enlarged view of part A of;

[0053] Figure 11 is a schematic structural view of a ball cap provided in an embodiment of the present invention;

[0054] Figure 12 is a schematic view of the open state of a blade provided in an embodiment of the present invention.

[0055] In the figure:

[0056] 1. Pipe body; 101. Slope baffle; 102. Chute;

[0057] 2. Electromagnetic drive device; 201. Electromagnetic induction coil;

[0058] 3. Magnetic ejection slider; 301. Sliding part;

[0059] 4. Blade; 401. Hinge hole;

[0060] 5. Limit slider; 501. Fitting part; 502. Hinge column;

[0061] 6. Ball structure; 601. Ball cap; 6011. Central hole; 6013. Fastening bolt; 602. Central ball; 603. Auxiliary ball;

[0062] 7. First elastic member;

[0063] 8. Socket part; 801. Abutting seat; 802. Limiting plate; 8021. Guide rail; 8022. Accommodating hole; 8023. Inclined surface;

[0064] 9. Second elastic member;

[0065] 10. Connecting rod;

[0066] 11. Upper joint;

[0067] 12. Lower joint;

[0068] 13. Enlarged part;

[0069] 100. Wellbore wall. Detailed implementation manners

[0070] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0071] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "far", "near", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0072] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0073] The inventor found that in the existing methods for reducing the friction resistance of the drill string, although the drill string can be straightened by fixing the centralizer (or stabilizer), which can reduce the local friction resistance, this method will increase the outer diameter of the drill string and have an adverse impact on subsequent drilling operations; while the method of reducing the friction coefficient between the drill string and the wellbore wall by improving the lubricity of the drilling fluid has a very limited effect on reducing the friction resistance of the drill string and can only slightly reduce the friction resistance of the drill string, and the effect is not ideal enough.

[0074] Based on this, the present invention provides a drilling drag reduction and stuck pipe releasing tool and a drilling drag reduction method, which will be described in detail through specific embodiments below.

[0075] Embodiment 1

[0076] The embodiment of the present invention provides a drilling drag reduction and stuck pipe releasing tool that can be connected to the drill string. Referring to Figure 1 、 Figure 2 、 Figure 3 and Figure 12 shown, it includes: a pipe body 1, an electromagnetic driving device 2, a magnetic ejection slider 3, a plurality of blades 4 and a plurality of limit sliders 5;

[0077] A plurality of blades 4 are circumferentially distributed on the outer wall of the pipe body 1. A plurality of slope baffles 101 are circumferentially arranged on the outer side wall of the pipe body 1 corresponding to the plurality of blades 4. At least one set of ball structures 6 is arranged on the outer edge of the blade 4;

[0078] A plurality of limit sliders 5 are circumferentially distributed on the outer wall of the pipe body 1;

[0079] Three magnetic push sliders 3 are sleeved on the pipe body 1, and both ends of the blade 4 are respectively hinged to the magnetic push slider 3 and the corresponding limit slider 5;

[0080] The electromagnetic driving device 2 is arranged on the side of the magnetic push slider 3 away from the blade 4, and the electromagnetic driving device 2 can drive the magnetic push slider 3 to slide axially;

[0081] The magnetic push slider 3 can push a plurality of blades 4 and limit sliders 5 to slide axially. The ramp baffle 101 is located on the sliding stroke of the corresponding blade 4 to jack up the blade 4 outward until the ball structure 6 abuts against the wellbore wall 100.

[0082] The drilling drag reduction and stuck pipe releasing tool provided by the embodiment of the present invention can be connected to the drill string and can be lowered into the wellbore together with the drill string for drilling operations. During the process of the drill string rotating and drilling, it is possible to encounter a situation where the friction between the drill string and the wellbore wall is relatively large and the axial or circumferential movement of the drill string is blocked. At this time, the electromagnetic driving device 2 can be started, so that a repulsive force is generated between the electromagnetic driving device 2 and the magnetic push slider 3, thereby driving the magnetic push slider 3 to slide in the direction of the blade 4, and then pushing a plurality of blades 4 and a plurality of limit sliders 5 to slide axially. Since the ramp baffle 101 is located on the sliding stroke of the blade 4, the blade 4 can be gradually jacked up by the ramp baffle 101 when passing through the ramp baffle 101, that is, the blade 4 rotates and opens relative to the magnetic push slider 3 and the limit slider 5 hinged thereto under the support of the ramp baffle 101, thereby straightening the drill string, and making the ball structure 6 on the outer edge of the blade 4 abut against the wellbore wall. The ball structure 6 can roll relative to the wellbore wall. Therefore, not only the contact area between the drill string and / or the drilling drag reduction and stuck pipe releasing tool and the wellbore wall is reduced, but also the sliding friction between the drill string and / or the drilling drag reduction and stuck pipe releasing tool and the wellbore wall is converted into rolling friction.

[0083] For the drilling drag reduction and stuck pipe releasing tool provided by the embodiment of the present invention, when the friction of the drill string is relatively large, the electromagnetic driving device 2 can be used to drive the magnetic push slider 3 to slide, thereby pushing the blade 4 to slide. The blade 4 can be jacked up when passing through the ramp baffle 101, so as to reduce the contact area between the drill string and the wellbore wall and reduce the friction between the drill string and the wellbore wall. By arranging the ball structure 6 on the outer edge of the blade 4, the ball structure 6 can abut against the wellbore wall after the blade 4 is jacked up, thereby converting the sliding friction into rolling friction, further reducing the friction between the drill string and the wellbore wall, reducing the friction coefficient and the drill string friction torque, reducing the drilling difficulty of the drill string, thus greatly improving the drilling efficiency, and reducing the risk of drill tool failure during the drilling process.

[0084] In the embodiment of the present invention, the drilling drag reduction and stuck pipe releasing tool can also straighten the drill string by expanding the blades 4 when the drill string is stuck by objects such as gravel slipping from the wellbore wall. The objects stuck to the drill string will fall off after the drill string is straightened, and the drill string can be released from the stuck state and restored to the normal rotary drilling state. The stuck pipe releasing process is simple and clear, which is convenient for control and operation.

[0085] In the embodiment of the present invention, referring to Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, the inner wall of the magnetic push slider 3 is circumferentially and uniformly provided with inwardly protruding sliding portions 301, and the outer wall of the pipe body 1 is correspondingly provided with sliding grooves 102. When the magnetic push slider 3 is sleeved on the pipe body 1, each sliding portion 301 is embedded in the sliding groove 102 on the outer wall of the pipe body 1. During the relative sliding of the magnetic push slider 3 with respect to the pipe body 1, each sliding portion 301 moves along the corresponding sliding groove 102; through the cooperation of the sliding portion 301 and the sliding groove 102, the contact area between the magnetic push slider 3 and the outer wall of the pipe body 1 is reduced, thereby reducing friction, avoiding wear of the pipe body 1 and the magnetic push slider 3, and also improving the accuracy and stability of sliding.

[0086] In the embodiment of the present invention, referring to Figures 1 - 3 shown, the drilling drag reduction and stuck pipe releasing tool may further include a first elastic member 7 sleeved on the pipe body 1 and a socket member 8. Wherein, the socket member 8 is fixed to the outer wall of the pipe body 1, and the first elastic member 7 is arranged between each limiting slider 5 and the socket member 8, and can respectively abut against each limiting slider 5 and the socket member 8. When the limiting slider 5 axially slides under the push of the magnetic push slider 3, the limiting slider 5 can compress the first elastic member 7. When the electromagnetic driving device 2 is turned off and the repulsive force between the electromagnetic driving device 2 and the electromagnetic push slider disappears, the magnetic push slider 3, each blade 4 and each limiting slider 5 are reset under the elastic force of the first elastic member 7. In addition, the first elastic member 7 can play a buffering role when the electromagnetic driving device 2 drives the magnetic push slider 3 to slide, absorb part of the vibration, and avoid damage to the various components of the drilling drag reduction and stuck pipe releasing tool due to vibration, impact, etc.

[0087] Furthermore, referring to Figures 1 - 3 shown, the drilling drag reduction and stuck pipe releasing tool may further include a plurality of second elastic members 9. The second elastic members 9 are respectively connected to the corresponding blades 4 and the limiting sliders 5. When the blades 4 are lifted, the second elastic members 9 are in a stretched state. When the electromagnetic driving device 2 is turned off and the repulsive force between the electromagnetic driving device 2 and the electromagnetic push slider disappears, each blade 4 will not only axially reset under the elastic force of the first elastic member 7, but also close to the pipe body 1 under the elastic force of the second elastic member 9. Therefore, when the axial or circumferential movement obstruction of the drill string is removed and the rotary drilling of the drill string returns to normal, the electromagnetic driving device 2 can be turned off to reset the blades 4, and the drilling drag reduction and stuck pipe releasing tool is restored to the original outer diameter, so as not to affect the subsequent drilling operation.

[0088] In a specific embodiment, the first elastic member 7 may be a disc spring assembly formed by a plurality of axially stacked disc springs. Compared with ordinary springs, the disc spring assembly has a compact axial space, a large deformation capacity per unit volume, and better shock absorption and vibration damping capabilities. Using the disc spring assembly as the first elastic member 7 can minimize the vibration generated during the drilling operation and when the drilling drag reduction and stuck pipe releasing tool operates, avoid damage to the drilling drag reduction and stuck pipe releasing tool due to vibration, and extend the service life of the drilling drag reduction and stuck pipe releasing tool. The second elastic member 9 may be a small-sized tension spring, so as to provide sufficient pulling force to pull the blade 4 back while not occupying a large space.

[0089] In the embodiment of the present invention, in order to stably install the first elastic member 7 and each limiting slider 5, referring to Figure 1 、 Figure 3 and Figure 6 as shown, the socket member 8 includes an abutting seat 801 and a plurality of limiting plates 802 circumferentially distributed at one end of the abutting seat 801, and the abutting seat 801 is fixedly connected to the outer wall of the pipe body 1. Each limiting plate 802 and each limiting slider 5 are staggered in phase, and a single limiting slider 5 can slide between the corresponding two limiting plates 802. Further, guide rails 8021 are respectively provided on both side walls of the limiting plate 802, and fitting portions 501 corresponding to the guide rails 8021 are respectively provided on both side walls of the limiting slider 5. The fitting portions 501 can be snapped into the guide rails 8021 so that the fitting portions 501 can slide on the guide rails 8021, thereby enabling the limiting slider 5 to slide stably relative to the limiting plate 802. An accommodation hole 8022 is further provided at one end of the limiting plate 802 connected to the abutting seat 801. The first elastic member 7 passes through the accommodation holes 8022 of the plurality of limiting plates 802 and abuts against the abutting seat 801. And, since the limiting slider 5 can slide between the corresponding two limiting plates 802, when the limiting slider 5 axially slides under the push of the magnetic ejection slider 3, it can abut against and compress the first elastic member 7.

[0090] In a specific embodiment, referring to Figure 1 、 Figure 3 and Figure 6As shown, the limiting plate 802 and the ramp baffle 101 can be correspondingly arranged on the same straight line and are both located on the sliding stroke of the corresponding blade 4. An inclined surface 8023 is provided at one end of the limiting plate 802 close to the limiting slider 5. Specifically, one end of the inclined surface 8023 close to the blade 4 is nearly flush with the outer wall of the pipe body 1, and the height difference between the outer wall of the pipe body 1 and the blade 4 increases as it gets farther away from the blade 4, so that the blade 4 can smoothly pass through the inclined surface 8023 of the limiting plate 802. Moreover, the inclined surface 8023 of the limiting plate 802 can also support the blade 4. After the blade 4 slides axially under the push of the magnetic ejection slider 3, it can be jointly supported by the ramp baffle 101 and the limiting plate 802, so that the supporting force it receives is more uniform, which is beneficial to protecting the blade 4 during the rotation and drilling process of the drill pipe and avoiding damage to the blade 4 when it opens to a certain extent.

[0091] In a specific embodiment, referring to Figure 1 , Figure 3 and Figure 9 As shown, the drilling drag reduction and sticking release tool may further include a connecting rod 10 for hinging the magnetic ejection slider 3 and the blade 4. One end of the connecting rod 10 is fixedly connected to the magnetic slider, and the other end extends into the hinge hole 401 of the blade 4 to hinge with the blade 4, so that the blade 4 can rotate with the connecting rod 10 as the rotation axis and is convenient to be lifted by the ramp baffle 101.

[0092] In a specific embodiment, referring to Figure 1 , Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, a hinge post 502 may be provided at one end of the limiting slider 5 hinged to the blade 4. The hinge post 502 can extend into the hinge hole 401 of the corresponding blade 4 to realize the hinge between the limiting slider 5 and the blade 4, so that the blade 4 can rotate relative to the limiting slider 5 with the hinge post 502 as the rotation axis and is convenient to be lifted by the ramp baffle 101.

[0093] In the embodiment of the present invention, referring to Figures 9 - 12As shown, the ball structure 6 may include a ball cap 601, a central ball 602, and a number of auxiliary balls 603. The diameter of the central ball 602 is greater than that of the auxiliary balls 603. Among them, the ball cap 601 can be fixed to the outer wall of the blade 4 through a fastening bolt 6013. The central ball 602 is accommodated in the ball cap 601. The ball cap 601 has a central hole 6011. At least a part of the central ball 602 protrudes from the central hole 6011, so that when the blade 4 is lifted, the central ball 602 can abut against the wellbore wall 100 and can roll relative to the wellbore wall 100, converting the rolling friction between the drill string and the drilling drag reduction and stuck pipe release tool and the wellbore wall into rolling friction, and reducing the friction resistance between the drilling drag reduction and stuck pipe release tool and the wellbore wall 100. A number of auxiliary balls 603 are arranged between the central ball 602 and the ball cap 601, converting the sliding friction between the central ball 602 and the ball cap 601 into rolling friction, and further reducing the friction resistance between the drilling drag reduction and stuck pipe release tool and the wellbore wall 100. The specific number of the auxiliary balls 603 can be reasonably set according to the gap between the ball cap 601 and the central ball 602, and no specific limitation is made here.

[0094] In one or some alternative embodiments, one or more sets of ball structures 6 may be arranged on the outer edge of the blade 4. For example, three sets, five sets, six sets, etc. can be arranged, and the specific arrangement can be reasonably set according to actual needs.

[0095] In a specific embodiment, referring to Figure 1 、 Figure 2 、 Figure 9 、 Figure 10 and Figure 12 As shown, six sets of ball structures 6 may be arranged on the outer edge of the blade 4. The six sets of ball structures 6 are arranged in two axial rows, so that the ball structures 6 can better fit the wellbore wall. When the blade 4 expands outwards, the central balls 602 of the three sets of ball structures 6 on the outer side first abut against the wellbore wall. If there are irregular protrusions on the wellbore wall, the central balls 602 of the three sets of ball structures 6 on the inner side can also contact the wellbore wall, thereby minimizing the friction between the blade 4 and the wellbore wall as much as possible and preventing the blade 4 from being worn.

[0096] In a specific embodiment, referring to Figure 1 、 Figure 2 、 Figure 6 and Figure 9As shown, the blade 4 can be a bent blade 4. For example, the middle part can be bent laterally, and the ramp baffle 101 is located in the gap formed at the bent part of the blade 4. When the blade 4 moves in the direction of the ramp baffle 101, the end of the blade 4 will pass by the ramp baffle 101, while the middle part of the blade 4 will avoid the ramp baffle 101, thereby improving the space utilization efficiency. Since the blade 4 is a bent blade 4, both the ramp baffle 101 and the limit plate 802 are located on the sliding stroke of the blade 4, and the limit plate 802 is arranged staggeredly with the limit slider 5. Therefore, the blade 4 and the limit slider 5 are arranged staggeredly in phase. One limit slider 5 corresponds to two adjacent blades 4. Specifically, the limit slider 5 is hinged to one blade 4 through the hinge post 502 and is connected to the other blade 4 through a tension spring.

[0097] In a specific embodiment, referring to Figures 1 - 3 As shown, upper joints 11 and lower joints 12 for connecting drill strings are respectively arranged at both axial ends of the pipe body 1, and the outer diameters of the upper joints 11 and the lower joints 12 are larger than the outer diameter of the pipe body 1. The upper joint 11 is located above the magnetic pushing slider 3, and furthermore, the electromagnetic driving device 2 can be arranged inside the upper joint 11 so that a repulsive force can be generated between the electromagnetic driving device 2 and the magnetic pushing slider 3. The lower joint 12 is located below the socket 8.

[0098] In a specific embodiment, referring to Figures 1 - 4 As shown, an enlarged part 13 is further arranged on the outer periphery of the pipe body 1 between the lower joint 12 and the socket 8, and the outer diameter of the enlarged part 13 is the same as the outer diameter of the lower joint 12. The above-mentioned ball structure 6 is circumferentially installed on the outer wall of the enlarged part 13. When the blade 4 is not opened, the enlarged part 13 may contact the wellbore wall, and the sliding friction between the enlarged part 13 and the wellbore wall can be converted into rolling friction through the ball structure 6, thereby reducing the friction resistance between the drilling drag reduction and stuck pipe releasing tools.

[0099] In a specific embodiment, referring to Figure 3 As shown, the electromagnetic driving device 2 can include a power supply (not shown in the figure) and an electromagnetic induction coil 201 which are electrically connected. The material of the magnetic pushing slider 3 can be a permanent magnet material, such as a permanent magnet, etc. The power supply can make the electromagnetic induction coil 201 energized to generate a magnetic field. By reasonably setting the placement directions of the electromagnetic induction coil 201 and the magnetic pushing slider 3, a mutually repulsive magnetic field force can be generated between the electromagnetic induction coil 201 and the magnetic pushing slider 3 to realize the driving of the magnetic pushing slider 3. The utilization of the magnetic field force enables the magnetic pushing slider 3 to be driven with only a small amount of electric energy, which significantly reduces the energy consumption compared with directly using a driving motor for driving. The principle of generating a mutually repulsive magnetic field force between the electromagnetic induction coil 201 and the magnetic pushing slider 3 is common general knowledge well-known to those skilled in the art and will not be elaborated here.

[0100] In a specific embodiment, the drilling drag reduction and stuck pipe releasing tool may further include a controller (not shown in the figure) for controlling the start and stop of the electromagnetic driving device 2. The controller may be a circuit control switch capable of receiving signals. The ground may transmit a control signal to the controller, and the controller can receive the control signal transmitted from the ground. Moreover, the controller is electrically connected to the power supply and the electromagnetic induction coil 201 respectively, and controls the energization and de-energization of the electromagnetic induction coil 201 according to the ground signal, so as to remotely control the start and stop of the electromagnetic driving device 2. The control signal may be a pulse signal, an electromagnetic wave signal, etc., and specific details can refer to the detailed records of the prior art and will not be elaborated here.

[0101] In the embodiment of the present invention, the specific process of using the drilling drag reduction and stuck pipe releasing tool for drilling may include:

[0102] (1) Connect the drilling drag reduction and stuck pipe releasing tool to the drill string and lower it into the wellbore together with the drill string for drilling operations;

[0103] (2) When the ground monitors that the axial or circumferential movement of the drill string and / or the drilling drag reduction and stuck pipe releasing tool is blocked (for example, the drill string cannot rotate or the rotation speed is too slow, etc.), the ground sends a control signal to the controller to control the energization of the electromagnetic induction coil 201, thereby driving the magnetic pushing slider 3 to slide axially;

[0104] (3) The magnetic pushing slider 3 pushes each blade 4 and each limiting slider 5 to slide axially. The blade 4 passes through the ramp baffle 101 and opens under the supporting action of the ramp baffle 101 until the central ball 602 of the ball structure 6 abuts against the wellbore wall. At the same time, the first elastic member 7 is compressed by each limiting slider 5, and the second elastic member 9 is stretched;

[0105] (4) When the situation where the axial or circumferential movement of the drill string and / or the drilling drag reduction and stuck pipe releasing tool is blocked is relieved and the drill string can rotate and drill normally, the ground sends a control signal to the controller to control the de-energization of the electromagnetic induction coil 201. The magnetic field force of mutual repulsion between the electromagnetic induction coil 201 and the magnetic pushing slider 3 disappears, and the magnetic pushing slider 3, the blade 4 and the limiting slider 5 reset under the elastic force of the first elastic member 7 and the second elastic member 9.

[0106] The drilling drag reduction and sticking releasing tool provided by the embodiment of the present invention drives the magnetic pushing slider 3 to slide through the magnetic force between the electromagnetic driving device 2 and the magnetic pushing slider 3, saving energy consumption; the drill string is straightened by the blades 4 opening and abutting against the wellbore wall, reducing the contact area between the drill string and the wellbore wall, thereby reducing the frictional resistance. By arranging a ball structure 6 on the outer edge of the blade 4, the sliding friction between the blade 4 and the wellbore wall is converted into rolling friction, further reducing the frictional resistance; by arranging a first elastic member 7, the shock absorption effect of the drilling drag reduction and sticking releasing tool is improved, and the service life of the drilling drag reduction and sticking releasing tool is prolonged. And through the combined action of the first elastic member 7 and the second elastic member 9, it is ensured that the magnetic pushing slider 3, each blade 4 and each limiting slider 5 can be reset in time when the electromagnetic driving device 2 stops driving, avoiding affecting subsequent drilling operations.

[0107] Embodiment 2

[0108] Based on the same inventive concept, the embodiment of the present invention also provides a drilling drag reduction method, which applies the drilling drag reduction and sticking releasing tool described in Embodiment 1, including:

[0109] S101: Connect the drilling drag reduction and sticking releasing tool to the drill string and lower it into the wellbore together with the drill string for drilling operations;

[0110] S102: When the axial or circumferential movement of the drill string and / or the drilling drag reduction and sticking releasing tool is blocked, start the electromagnetic driving device 2 to drive the magnetic pushing slider 3 to push a plurality of blades 4 and a plurality of limiting sliders 5 to slide axially, so that a plurality of blades 4 open under the support of the slope baffle 101 until the ball structure 6 abuts against the wellbore wall.

[0111] In the embodiment of the present invention, after the blade 4 opens under the support of the slope baffle 101, the drill string can be straightened and the contact area between the drill string and the wellbore wall can be reduced, thereby reducing the frictional resistance between the drill string and the wellbore wall. The ball structure 6 abutting against the wellbore wall can convert the sliding friction between the blade 4 and the wellbore wall into rolling friction, further reducing the frictional resistance between the drill string and the wellbore wall, and releasing the situation where the axial or circumferential movement of the drill string and / or the drilling drag reduction and sticking releasing tool is blocked, so that the drill string can rotate and drill normally.

[0112] In the embodiment of the present invention, this drilling drag reduction method corresponds to the drilling drag reduction and sticking releasing tool described in Embodiment 1, and its specific implementation process can refer to the process of drilling with the drilling drag reduction and sticking releasing tool and the drill string together described in Embodiment 1. For repeated parts, they will not be elaborated here.

[0113] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. The present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A drilling drag reduction and sticking releasing tool capable of connecting a drill string, characterized in that, Comprising: a pipe body, an electromagnetic driving device, a magnetic pushing slider, a plurality of blades and a plurality of limiting sliders; the plurality of blades are circumferentially distributed on the outer wall of the pipe body, a plurality of slope baffles are circumferentially arranged on the outer side wall of the pipe body corresponding to the plurality of blades, and at least one set of ball structures are arranged on the outer edge of the blade; the plurality of limiting sliders are circumferentially distributed on the outer wall of the pipe body; the magnetic pushing slider is sleeved on the pipe body, and two ends of the blade are respectively hinged to the magnetic pushing slider and the corresponding limiting slider; the electromagnetic driving device is arranged on a side of the magnetic pushing slider away from the blade, and the electromagnetic driving device can drive the magnetic pushing slider to axially slide; the magnetic pushing slider can push the plurality of blades and the limiting sliders to axially slide, and the slope baffle is located on the sliding stroke of the corresponding blade to jack the blade outwards until the ball structure abuts against the well wall.

2. The drag reduction and stuck pipe releasing tool according to claim 1, wherein It further includes a first elastic member and a socket member sleeved on the pipe body; the socket member is fixedly connected to the pipe body; two ends of the first elastic member can respectively abut against the limiting slider and the socket member; the limiting slider can compress the first elastic member under the push of the magnetic pushing slider, and after the electromagnetic driving device stops driving, the magnetic pushing slider, the plurality of blades and the limiting slider reset under the elastic force of the first elastic member.

3. The drilling drag reduction and stuck pipe releasing tool according to claim 2, wherein, the socket member includes an abutting seat and a plurality of limiting plates circumferentially distributed at one end of the abutting seat; a receiving hole is arranged at the end of the limiting plate; the first elastic member passes through the receiving holes of the plurality of limiting plates and abuts against the abutting seat.

4. The drag reduction and stuck pipe releasing tool according to claim 3, wherein, the limiting slider and the limiting plate are arranged in an alternating manner; guide rails are respectively arranged on two side walls of the limiting plate, and matching parts corresponding to the guide rails are respectively arranged on two side walls of the limiting slider.

5. The drilling drag reduction and sticking releasing tool according to claim 3, wherein, a slope is arranged at one end of the limiting plate close to the limiting slider.

6. The drag reduction and stuck pipe releasing tool according to claim 1, wherein, It further includes a second elastic member; the second elastic member is respectively connected to the corresponding blade and the limiting slider.

7. The drag reduction and stuck pipe releasing tool according to claim 1, wherein the ball structure includes a ball cap, a central ball and a plurality of auxiliary balls; the ball cap is fixed on the outer wall of the blade; the ball cap has a central hole, the central ball is accommodated in the ball cap and at least partially protrudes from the central hole; the auxiliary balls are arranged between the central ball and the ball cap.

8. The drilling drag reduction and stuck pipe releasing tool according to claim 1, wherein, It further includes a connecting rod; one end of the connecting rod is connected to the magnetic pushing slider, and the other end is hinged to the blade.

9. The drilling drag reduction and stuck pipe releasing tool according to claim 1, wherein, the blade is a bent blade, and the slope baffle is located at the bent part of the blade.

10. The drilling drag reduction and stuck pipe releasing tool according to claim 1, characterized in that upper joints and lower joints for connecting drill strings are respectively arranged at two axial ends of the pipe body; the electromagnetic driving device is arranged in the upper joint.

11. The drag reduction and stuck pipe releasing tool for well drilling according to claim 1, characterized in that, It further includes a controller electrically connected to the electromagnetic driving device; the controller can receive ground signals and control the start and stop of the electromagnetic driving device according to the ground signals.

12. The drag reduction and stuck pipe releasing tool according to claim 1, wherein, the electromagnetic driving device includes a power supply and an electromagnetic induction coil which are electrically connected; the magnetic pushing slider is made of a permanent magnet material.

13. A drilling drag reduction method, which applies the drilling drag reduction and stuck pipe releasing tool according to any one of claims 1-12, characterized in that, Comprising: Connect the drilling drag reduction and sticking release tool to the drill string and lower it into the wellbore together with the drill string for drilling operations; When the axial or circumferential movement of the drill string and / or the drilling drag reduction and sticking releasing tool is blocked, the electromagnetic driving device is started to drive the magnetic pushing slider to push a plurality of blades and a plurality of limiting sliders to slide axially, so that the plurality of blades are opened under the supporting action of the ramp baffle until the ball structure abuts against the wellbore wall.

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