A method and apparatus for drilling a wellbore

Abstract

The present application relates to a kind of rectification eccentric drill and correction method of running deviation, belong to geological core drilling technical field.The technical scheme is: if running deviation occurs in the process of drilling, replace rectification eccentric drill and drill;When rectification eccentric drill rotates, the centrifugal force, contact pressure and fluid dynamic effect generated are uneven in the circumferential direction of borehole, can balance the running deviation radial force exerted by borehole wall to rectification eccentric drill, promote borehole trajectory to be gradually corrected.The present application has beneficial effects: applied in wire-line coring drilling, both can prevent drill running deviation, and can correct the running deviation of drill, actively offset or balance deflection force, inhibit running deviation, improve the stability of drill in easy running deviation stratum drilling, inhibit the unexpected change of azimuth angle and inclination.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of rectification eccentric drill and correction method of running deviation, belong to geological core drilling technology field. BACKGROUND

[0002] In geological drilling, drill includes outer tube, reamer and wireline coring bit connected in turn from top to bottom, outer tube drives reamer and wireline coring bit to rotate for geological drilling. Geological drilling has strict requirements for borehole trajectory, usually expressed by inclination and azimuth, when the inclination and azimuth of borehole come and go deviation, the trajectory of borehole will become a downward spiral. If the hole trajectory deviates from the design azimuth and inclination, commonly known as "running deviation". In order to avoid "running deviation", Chinese patent application CN202410020560.7, patent name "a drilling device and method for preventing borehole running deviation". The patent application discloses a device composed of pilot bit, reaming bit, high-precision drill pipe column (straightness <1:6000) and high-strength drill pipe column, and a method of "two times of down technical casing + high-speed drilling in easy deviation formation", through the cooperation of "small-diameter guide + large-diameter reaming" mechanical structure, effectively solve the deviation problem caused by single easy deviation formation low-precision drill pipe column swing.

[0003] However, in the actual geological drilling construction process, it is found that this technical scheme has functional limitations: its core focuses on preventing borehole running deviation, that is, by optimizing the structure of drill and drilling process, preventing and reducing the risk of running deviation from the source, if the borehole has running deviation, the patent cannot correct the trajectory. Under complex geological conditions, even if anti-deviation measures are taken, uncontrollable factors such as sudden changes in stratum (such as local superhard interlayer, fault fracture zone), instantaneous fluctuation of drilling parameters, etc. may cause the borehole to deviate by 0.5°-2°. The main reason for running deviation in the actual geological drilling construction process is that when drilling in easy deviation formation, the symmetrical design of the existing wireline coring drill has significant problems. The drill is affected by lateral unbalanced force due to uneven geological conditions, eccentric force and drilling pressure, etc. in the hole, which makes the borehole trajectory easy to deviate from the design azimuth and inclination. Running deviation not only affects the accuracy of geological data, increases equipment wear and tear, increases subsequent drilling difficulty and cost, and in severe cases may lead to abandonment of the borehole.

[0004] At present, once running deviation occurs, the existing technology can only correct it by replacing the special correction drill (such as eccentric wedge, bent joint drill) and re-drilling, which not only requires additional investment in the purchase of correction drill, but also wastes 3-8 hours of construction time due to multiple drilling and re-drilling, which greatly reduces the drilling efficiency. Especially in deep hole (>1500 meters) or harsh field drilling scenarios, the time and economic cost of correction process is more significant. SUMMARY

[0005] The present application aims to provide a kind of rectification eccentric drill and corrects the method of running oblique, applied in wire-line coring drilling, both can prevent drill running oblique, also can be modified to drill that has run oblique, initiative counteracts or balances the deflection force, inhibits running oblique, improves the stability of drill in easy running oblique strata drilling, inhibits the unexpected change of azimuth angle and inclination, solves the above technical problems existing in prior art.

[0006] The technical scheme of the present application is:

[0007] A kind of rectification eccentric drill, it is connected in sequence from top to bottom by asymmetric outer tube, reamer and eccentric wire-line coring drill bit, the asymmetric outer tube is the eccentric pipe body of wall thickness is non-uniform, both ends are equipped with thread, its rotation axis L1 with the rotation axis of thread of both ends of asymmetric outer tube coincides, with the geometric center axis L2 of eccentric pipe body parallel and not coincides, the eccentric distance e1 between rotation axis L1 and geometric center axis L2;The eccentric wire-line coring drill bit includes the bit matrix of integrated structure and rigid body, the bit matrix is the eccentric drill bit of asymmetric structure, the rigid body itself is symmetric structure, the drill bit rotation center line L4 of eccentric wire-line coring drill bit coincides with the symmetric center line of rigid body, the matrix symmetric center line L3 of bit matrix and drill bit rotation center line L4 are parallel to each other, not on the same straight line, the eccentric distance e2 between matrix symmetric center line L3 and drill bit rotation center line L4, e1 and e2 are equal;The reamer is connected by thread respectively lower end of asymmetric outer tube and rigid body of eccentric wire-line coring drill bit to form drill, the straight line of rotation axis L1, the axis of reamer and drill bit rotation center line L4 is the rotation axis L6 of drill, the matrix symmetric center line L3 of eccentric wire-line coring drill bit and the geometric center axis L2 of asymmetric outer tube are located on the same side of the rotation axis L6 of drill, the bit matrix is rotated around the rotation axis L6 of drill.

[0008] Further, the geometric center axis L2 and matrix symmetric center line L3 are located on a straight line, the straight line of geometric center axis L2 and matrix symmetric center line L3 is the geometric center line L7 of drill, the eccentric distance between the geometric center line L7 of drill and the rotation axis L6 of drill is e, e=e1=e2, the geometric center line L7 of drill is rotated around the rotation axis L6 of drill.

[0009] Further, the outer tube wall of asymmetric outer tube is equipped with spiral convex edge.

[0010] Further, the both ends of asymmetric outer tube are equipped with asymmetric outer tube male thread and asymmetric outer tube female thread respectively, the rigid body end of eccentric wire-line coring drill bit upper end is equipped with drill thread, the reamer is connected by thread respectively asymmetric outer tube female thread of lower end of asymmetric outer tube and drill thread of eccentric wire-line coring rigid body.

[0011] The center of symmetry L3 of the body of the eccentric rope coring bit and the geometric center axis L2 of the asymmetric outer tube are located on the same side of the drill tool rotation axis L6, the eccentric directions of the eccentric rope coring bit and the asymmetric outer tube are consistent, and the two jointly act on the same side of the drill tool, so that the centrifugal force is larger when the bit is rotating and cutting, and the easy deviation radial force of the borehole wall on the drill tool can be reduced or offset. When the asymmetric outer tube is rotating, the centrifugal force, contact pressure and fluid dynamic effect generated by the asymmetric outer tube are uneven in the circumferential direction, so that the deviation radial force of the borehole wall on the drill tool can be balanced, and the raised spiral ribs on the outer tube wall of the asymmetric outer tube can provide radial support points when the raised spiral ribs contact the borehole wall, so that axial support and circumferential rotation are combined to generate more stable righting and deviation correction effects, and deviation of the drill tool is prevented.

[0012] In order to ensure the consistency of the eccentric directions of the eccentric rope coring bit and the asymmetric outer tube, the starting point of the connecting thread is controlled to ensure that the center of symmetry L3 of the body of the eccentric rope coring bit and the geometric center axis L2 of the asymmetric outer tube jointly act on the same side of the drill tool, so that a stronger and continuous deviation correction force is formed, the formation of the borehole is prevented from bending in the easy deviation direction, and the formation of the borehole is prevented from bending in the easy deviation direction.

[0013] A method for correcting deviation using a deviation correction eccentric drill tool, if deviation occurs in the borehole during drilling, the deviation correction eccentric drill tool is replaced to drill; when the deviation correction eccentric drill tool is rotating, the centrifugal force, contact pressure and fluid dynamic effect generated by the deviation correction eccentric drill tool are uneven in the circumferential direction of the borehole, so that the deviation radial force of the borehole wall on the deviation correction eccentric drill tool can be balanced, and the borehole trajectory is gradually corrected.

[0014] Specifically includes the following steps:

[0015] S1: detecting the bending position and bending angle θ of the borehole;

[0016] S2: setting the eccentric distance e and the speed ω of the rotation angle of the deviation correction eccentric drill tool according to the bending angle θ;

[0017] S3: connecting the asymmetric outer tube of the deviation correction eccentric drill tool to the lower part of the drilling rig drill rod system, so that the eccentric rope coring bit is pushed along the axial direction of the borehole and rotates at an angular velocity ω;

[0018] S4: a correction moment is formed by the centrifugal force F=m·ω²·e generated by the rotation of the deviation correction eccentric drill tool and the reaction force of the borehole wall, until the bending angle θ≤0.5°; m is the mass of the deviation correction eccentric drill tool, ω is the angular velocity of the rotation of the deviation correction eccentric drill tool, and e is the eccentric distance of the deviation correction eccentric drill tool.

[0019] The beneficial effects of the present application are: 1. Automatic correction: only a small amount of manual intervention is required, and the correction moment of the directional drilling trajectory to the opposite side of the syncline is naturally generated by the eccentric structure, which is synchronized with the construction process; 2. Strong adaptability: by adjusting the eccentricity e1 and the angular velocity ω, most pipe bends in a certain angle range can be handled; 3. Simple structure: no complex control system, only mechanical structure is used to realize correction, and the maintenance cost is low; 4. Efficiency improvement: correction and propulsion are synchronized, and the construction period is shortened by 20%-30%; 5. Good compatibility: it can be adapted to the existing drilling driving device without modification of the construction equipment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The figure is a structural schematic diagram of an embodiment of the present application.

[0021] Figure 2 The figure is a cross-sectional view of an eccentric rope coring bit of an embodiment of the present application.

[0022] Figure 3 The figure is a cross-sectional view of an asymmetric outer tube of an embodiment of the present application.

[0023] Figure 4 The figure is a force analysis schematic diagram of a drilling tool system in a running deviation path in a well of an embodiment of the present application.

[0024] In the figure: asymmetric outer tube 1, eccentric rope coring bit 2, bit carcass 3, rigid body 4, drill bit thread 5, asymmetric outer tube male thread 6, asymmetric outer tube wall one 7, asymmetric outer tube wall two 8, asymmetric outer tube female thread 9, helical protrusions 10, reamer 11, hole wall 12. DETAILED DESCRIPTION

[0025] The present application will be further described by embodiments in combination with the accompanying drawings.

[0026] Referring to the accompanying drawings Figures 1-3The application discloses a straightening eccentric drill tool, which comprises an asymmetric outer tube 1, a reamer 11 and an eccentric wire-line core drill bit 2 connected in sequence from top to bottom, the asymmetric outer tube 1 is an eccentric tube body with non-uniform wall thickness, both ends of the asymmetric outer tube 1 are provided with threads, the rotating axis L1 of the asymmetric outer tube 1 coincides with the rotating axis of the threads at both ends of the asymmetric outer tube 1, the rotating axis L1 is parallel to the geometric center axis L2 of the eccentric tube body and does not coincide with the geometric center axis L2, and the eccentric distance e1 is formed between the rotating axis L1 and the geometric center axis L2; the eccentric wire-line core drill bit 2 comprises a drill bit matrix 3 and a rigid body 4 in an integrated structure, the drill bit matrix 3 is an eccentric drill bit with an asymmetric structure, the rigid body 4 is a symmetric structure, the drill bit rotating center line L4 of the eccentric wire-line core drill bit 2 coincides with the symmetric center line of the rigid body 4, the matrix symmetric center line L3 of the drill bit matrix 3 and the drill bit rotating center line L4 are parallel to each other and not on the same straight line, the eccentric distance e2 is formed between the matrix symmetric center line L3 and the drill bit rotating center line L4, e1 and e2 are equal; the reamer 11 is connected with the lower end of the asymmetric outer tube 1 and the rigid body 4 of the eccentric wire-line core drill bit 2 through threads to form the drill tool, the straight line formed by the rotating axis L1, the axis of the reamer 11 and the drill bit rotating center line L4 is the rotating axis L6 of the drill tool, the matrix symmetric center line L3 of the eccentric wire-line core drill bit 2 and the geometric center axis L2 of the asymmetric outer tube 1 are located on the same side of the rotating axis L6 of the drill tool, and the drill bit matrix 3 rotates around the rotating axis L6 of the drill tool.

[0027] In the embodiment,

[0028] The rotating axis is L1, the geometric center axis is L2, the matrix symmetric center line is L3, the drill bit rotating center line is L4, the eccentric distance of the asymmetric outer tube 1 is e1, the eccentric distance of the eccentric wire-line core drill bit 2 is e2, the inner side contact pressure of a hole wall is F1, the lower contact pressure of an outer side of a hole wall is F2, the upper contact fulcrum of an outer side of a hole wall is F3, the top driving pressure is F4, the bending angle is theta, the angular velocity of the straightening eccentric drill tool rotation is omega, the plumb line (the drilling plan direction) is L5, the rotating axis of the drill tool is L6, and the geometric center line of the drill tool is L7.

[0029] The geometric center axis L2 and the matrix symmetric center line L3 are located on a straight line, the straight line formed by the geometric center axis L2 and the matrix symmetric center line L3 is the geometric center line L7 of the drill tool, the eccentric distance between the geometric center line L7 of the drill tool and the rotating axis L6 of the drill tool is e, e = e1 = e2, and the geometric center line L7 of the drill tool rotates around the rotating axis L6 of the drill tool.

[0030] Referring to the drawings Figure 1 A spiral convex rib 10 is arranged on the outer tube wall of the asymmetric outer tube 1.

[0031] Referring to the drawings Figure 2 and 3The asymmetric outer tube 1 is provided with an asymmetric outer tube male thread 6 and an asymmetric outer tube female thread 9 at two ends, respectively, the rigid body 4 at the upper end of the eccentric rope coring drill bit 2 is provided with a drill bit thread 5, and the reamer 11 is connected with the asymmetric outer tube female thread 9 at the lower end of the asymmetric outer tube 1 and the drill bit thread 5 of the rigid body 4 of the eccentric rope coring drill bit 2 through threads.

[0032] Refer to the attached drawings Figure 3 The pipe wall thicknesses of the two sides of the asymmetric outer tube 1 are different, and the thickness of the asymmetric outer tube wall one 7 is smaller than that of the asymmetric outer tube wall two 8.

[0033] The symmetric center line L3 of the matrix of the eccentric rope coring drill bit 2 and the geometric center axis L2 of the asymmetric outer tube 1 are located on the same side of the drill tool rotation axis L6, the eccentric directions of the eccentric rope coring drill bit 2 and the asymmetric outer tube 1 are consistent, and the two jointly act on the same side of the drill tool, so that the centrifugal force is larger when the drill bit is rotating and cutting, and the easy deviation radial force of the hole wall 12 to the drill tool can be reduced or offset. When the asymmetric outer tube 1 rotates, the centrifugal force, contact pressure and fluid dynamic effect generated by the asymmetric outer tube 1 are uneven in the circumferential direction, the deviation radial force of the hole wall 12 to the drill tool can be balanced, and the raised spiral ribs 10 on the outer tube wall of the asymmetric outer tube 1 can provide radial support points when the raised spiral ribs 10 contact the hole wall 12, the axial support is combined with the circumferential rotation, a more stable righting and deviation correction effect is generated, and the deviation of the drill tool is prevented.

[0034] In order to ensure the consistency of the eccentric directions of the eccentric rope coring drill bit 2 and the asymmetric outer tube 1, the starting points of the connecting threads are controlled to ensure that the symmetric center line L3 of the matrix of the eccentric rope coring drill bit 2 and the geometric center axis L2 of the asymmetric outer tube 1 jointly act on the same side of the drill tool, a stronger and continuous deviation correction force is formed, the formation of the whole drilling hole bending to the easy deviation direction is prevented, and the formation of the whole drilling hole bending to the easy deviation direction is prevented.

[0035] The function of the eccentric rope coring drill bit 2 is mainly to generate a guiding and deviation correction force at the bottom of the hole, and directly act on the feed direction of the drill bit.

[0036] The function of the asymmetric outer tube 1 is mainly to generate a righting and deviation correction force at the upper part of the drill bit, to stabilize the dynamic balance of the drill tool and to reduce the bending.

[0037] The eccentric structure of the eccentric rope coring drill bit 2 and the asymmetric outer tube 1 only changes the shape and size of the outer diameter of the drill tool, does not affect the connection with the reamer 11, and does not affect the launching and fishing of the whole rope coring inner tube system.

[0038] A method for correcting deviation using a deviation correction eccentric drill, if deviation occurs during drilling, replace the deviation correction eccentric drill to drill; the centrifugal force, contact pressure and fluid dynamic effect generated by the deviation correction eccentric drill during rotation are uneven in the circumference of the borehole, which can balance the deviation radial force exerted by the hole wall 12 on the deviation correction eccentric drill and push the borehole trajectory to gradually correct.

[0039] The deviation correction principle is that when the deviation correction eccentric drill rotates around the drill rotation axis L6 in the curved borehole, due to the eccentricity e between the drill geometric center axis L7 and the drill rotation axis L6, a centrifugal force F = m·ω²·e is generated, where m is the mass of the deviation correction eccentric drill, ω is the angular velocity of the deviation correction eccentric drill rotation, and e is the eccentricity of the deviation correction eccentric drill; the centrifugal force F direction is radially outward along the line connecting the drill geometric center axis L7 and the drill rotation axis L6, breaking the symmetry of the hole wall 12 supporting force in the initial state, making the drill have a movement trend to deviate to the outside of the hole wall 12; in the pipeline curved section, the centrifugal force F pushes the drill geometric center axis L7 to deviate to the outside of the hole wall 12, and due to the space limitation of the curved trajectory of the borehole, the contact pressure F1 between the deviation correction eccentric drill and the inside of the hole wall is significantly greater than the contact pressure F2 on the lower part of the outside of the hole wall, forming an asymmetric reaction force, the difference being ΔF = F1-F2, and further generating a net moment M = F·r·sinθ directed to the vertical line 15 of the borehole, where r is the radius of the pipeline and θ is the bending angle, and the net moment M direction is directed to the vertical line 15 of the borehole; as the correction proceeds, gradually reduce the angular velocity ω of rotation, and push the borehole trajectory to gradually correct. The vertical line 15 is the planned direction of the borehole.

[0040] The present application can also prevent the occurrence of borehole deviation, and normal drilling is carried out using ordinary drill in stable stratum drilling; the deviation correction eccentric drill is replaced in advance to drill in easy deviation stratum or soft and hard alternating stratum; and the ordinary drill is used again to continue drilling after leaving the easy deviation stratum or soft and hard alternating stratum.

[0041] In the embodiment, the present application automatically generates a correction moment directed to the center straight line direction by designing an asymmetric outer pipe 1 with an eccentricity between the rotation axis and the geometric center, using centrifugal force and the asymmetric reaction force of the hole wall 12 during rotation. The use process includes: detecting the bending parameters of the borehole, i.e. the bending angle θ, setting the eccentricity e of the deviation correction eccentric drill and the rotation speed and angular velocity ω of the deviation correction eccentric drill, starting the deviation correction eccentric drill to push and rotate and monitoring and adjusting in real time. The present application only needs a small amount of manual intervention, is suitable for borehole bending with a bending angle θ range of 0.5°-10° (later adjustment), has the characteristics of simple structure, high efficiency and low cost, and is suitable for long-distance pipeline construction scenes such as oil and gas drilling and underground pipeline.

[0042] The asymmetric outer tube male thread 6 at the upper end of the asymmetric outer tube 1 is used to connect with the drill pipe and the full hydraulic top drive device. The helical ribs 10 are arranged on the outer surface of the asymmetric outer tube 1, and are used for stable centralizing and straightening.

[0043] Specifically comprising the following steps:

[0044] S1: detecting the bending position and bending angle θ of the borehole;

[0045] S2: according to the bending angle θ, setting the eccentric distance e and the angular velocity ω of the straightening eccentric drill;

[0046] S3: connecting the asymmetric outer tube 1 of the straightening eccentric drill to the lower part of the drill pipe system of the drilling machine, so that the eccentric wire-line coring bit 2 is pushed along the axial direction of the borehole and rotates at the angular velocity ω;

[0047] S4: forming a correction moment through the centrifugal force F=m·ω²·e generated by the rotation of the straightening eccentric drill and the reaction force of the borehole wall 12, until the bending angle θ≤0.5°; m is the mass of the straightening eccentric drill, ω is the angular velocity of the rotation of the straightening eccentric drill, and e is the eccentric distance of the straightening eccentric drill.

[0048] Referring to the accompanying drawings Figure 4 , the upper part of the straightening eccentric drill is in contact with the borehole wall 12 in the borehole, F3 is the contact fulcrum of the upper part on the outside of the borehole wall, and F4 is the driving pressure applied to the top of the straightening eccentric drill by the drilling system.

[0049] In the manufacturing of the eccentric wire-line coring bit 2 and the asymmetric outer tube 1, a numerical control lathe with a C shaft is used to manufacture and thread the pipe body eccentrically. The operation steps are as follows (single clamping completes the part machining): 1. Taking the rotation shaft axis as the reference, the C shaft is fixed at the circumferential angle, the X shaft is radially offset to the set eccentric distance, and the pipe body outer circle is turned to form the eccentric structure. 2. Keeping the C shaft angle unchanged (ensuring the uniformity of the eccentric direction), the pipe body two-end threads are turned through the synchronous linkage of the C shaft and the Z shaft. 3. The pipe body two-end positioning bosses or grooves are machined by using the power tool holder, so as to ensure the alignment with the eccentric direction.

Claims

1. A straightening eccentric drill tool, characterized by: The asymmetric outer tube (1), the reamer (11) and the eccentric wire-line core bit (2) are sequentially connected from top to bottom, the asymmetric outer tube (1) is an eccentric tube body with non-uniform wall thickness, both ends are provided with threads, the rotation axis L1 coincides with the rotation axis of the threads at both ends of the asymmetric outer tube (1), is parallel to and does not coincide with the geometric center axis L2 of the eccentric tube body, the eccentric distance e1 is formed between the rotation axis L1 and the geometric center axis L2, the eccentric wire-line core bit (2) comprises an integral structure of the bit body (3) and the rigid body (4), the bit body (3) is an eccentric bit with an asymmetric structure, the rigid body (4) is a symmetric structure itself, the bit rotation center line L4 of the eccentric wire-line core bit (2) coincides with the symmetric center line of the rigid body (4), the bit body symmetric center line L3 of the bit body (3) and the bit rotation center line L4 are parallel to each other and not on the same straight line, the eccentric distance e2 is formed between the bit body symmetric center line L3 and the bit rotation center line L4, e1 and e2 are equal, the reamer (11) is connected with the lower end of the asymmetric outer tube (1) and the rigid body (4) of the eccentric wire-line core bit (2) through threads to form a drilling tool, the straight line formed by the rotation axis L1, the axis of the reamer (11) and the bit rotation center line L4 is the drilling tool rotation axis L6, the bit body symmetric center line L3 of the eccentric wire-line core bit (2) and the geometric center axis L2 of the asymmetric outer tube (1) are located on the same side of the drilling tool rotation axis L6, the bit body (3) rotates around the drilling tool rotation axis L6, the geometric center axis L2 and the bit body symmetric center line L3 are located on a straight line, the straight line formed by the geometric center axis L2 and the bit body symmetric center line L3 is the drilling tool geometric center line L7, the eccentric distance between the drilling tool geometric center line L7 and the drilling tool rotation axis L6 is e, e = e1 = e2, the drilling tool geometric center line L7 rotates around the drilling tool rotation axis L6.

2. A straightening eccentric drill tool according to claim 1, characterized in that: The outer tube wall of the asymmetric outer tube (1) is provided with spiral convex edges (10).

3. A straightening eccentric drill tool as defined in claim 2, wherein: The two ends of the asymmetric outer tube (1) are respectively provided with an asymmetric outer tube male thread (6) and an asymmetric outer tube female thread (9), the end of the rigid body (4) of the eccentric wire-line core bit (2) is provided with a bit thread (5), the reamer (11) is connected with the asymmetric outer tube female thread (9) of the lower end of the asymmetric outer tube (1) and the bit thread (5) of the rigid body (4) of the eccentric wire-line core bit (2) through threads.

4. A method for correcting the deviation of a deviated eccentric drilling tool using the deviated eccentric drilling tool according to any one of claims 1-3, characterized in that: During drilling, if the borehole appears to deviate, a deviation correction eccentric drilling tool is replaced to drill, the centrifugal force, contact pressure and fluid dynamic effect generated when the deviation correction eccentric drilling tool rotates are uneven in the circumferential direction of the borehole, can balance the deviation radial force applied to the deviation correction eccentric drilling tool by the borehole wall (12) and push the borehole trajectory to gradually correct.

5. A method of correcting for running-inclination according to claim 4, characterised in that Specifically includes the following steps: S1: detecting the bending position and bending angle θ of the borehole; S2: setting the eccentric distance e and the angular velocity ω of the rotation of the deviation correction eccentric drilling tool according to the bending angle θ. S3: the asymmetric outer tube (1) of the straightening eccentric drilling tool is connected to the lower part of the drilling rig drill rod system, so that the eccentric wire line coring bit (2) is pushed along the axial direction of the borehole and rotates at an angular velocity ω; S4: a correction torque is formed by the centrifugal force F=m·ω²·e generated by the rotation of the straightening eccentric drilling tool and the reaction force of the borehole wall (12), until the bending angle θ≤0.5°; m is the mass of the straightening eccentric drilling tool, ω is the angular velocity of the rotation of the straightening eccentric drilling tool, and e is the eccentricity of the straightening eccentric drilling tool.

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