Downhole closed-loop anti-deviation tool

Abstract

The invention relates to the field of well drilling guidance, and discloses an underground closed-loop anti-deviation tool which comprises a shell, an anti-deviation device and a control device. A rotating impeller (7) and a hydraulic pump (16) arranged in the housing; the concave parts are arranged on the periphery of the shell at intervals in the circumferential direction; a plunger (42) and a backup plate (44); a plurality of hydraulic flow paths arranged in the housing at intervals in a circumferential direction; when the shell inclines, the eccentric flow dividing disc (26) rotates to the state that the notch is located at the high position and the gravity center is located at the low position, so that one hydraulic flow path is communicated, and the other hydraulic flow paths are disconnected. Therefore, the plunger (42) and the backup plate (44) corresponding to the communicated hydraulic flow path are driven to move outwards in the radial direction. According to the technical scheme, the whole set of tool is not provided with electronic devices, is different from an existing mechanical and electrical integrated anti-deviation tool, has no temperature limitation and can completely adapt to normal-temperature, high-temperature and ultra-high-temperature well environments.

Description

Technical Field

[0001] The invention relates to the field of directional drilling instruments in the oil drilling industry, and in particular to an underground closed-loop anti-deflection tool. Background Art

[0002] The number of vertical wells in the world accounts for 60% of the total number of wells. With the continuous expansion of exploration and development, the exploration and development workload of high-steep structures and large-angle formations is increasing, and the problem of preventing deflection and straightening is becoming more and more prominent. In drilling engineering, preventing deflection and straightening has always been a complex and urgent problem to be solved. At present, there are two main forms of preventing deflection and straightening: active and passive.

[0003] Passive anti-deflection and fast drilling technical measures include: tower drilling tools, pendulum drilling tools, strong rigidity drilling tools, eccentric drilling tools, single-bend screw composite drilling and other drilling tool combinations. When the formation deflection force is not large, using tower, pendulum and other anti-deflection drilling tool combinations, adopting inclination measurement while drilling and timely adjusting parameters can achieve efficient drilling and effectively control well inclination. When the formation deflection force is large, no matter which anti-deflection drilling tool combination is used, it can only stabilize a certain well inclination, but the effect of reducing inclination is not good.

[0004] Active anti-deflection and straightening measures mainly refer to the use of vertical drilling tools to achieve this drilling goal. At present, most of the vertical drilling tools at home and abroad adopt the electromechanical and hydraulic integrated design. Its characteristics are: obvious anti-deflection and straightening effect, high control accuracy. However, the structure is complex and the cost is high. At the same time, with the development of deep and ultra-deep well drilling technology, the underground temperature has increased to 175℃ or even above 200℃. Due to the temperature resistance of electronic devices, the failure rate of vertical drilling tools has increased significantly, and it cannot meet the drilling anti-deflection needs. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem that the drilling anti-deflection tool in the prior art cannot withstand the high temperature environment underground.

[0006] In order to achieve the above-mentioned object, the present invention provides a downhole closed-loop anti-deflection tool, which comprises:

[0007] A housing, two ends of which can be connected to a drill rod and a drill bit respectively;

[0008] A rotary impeller disposed in the housing, the rotary impeller being capable of being driven to rotate by drilling fluid;

[0009] A hydraulic pump disposed in the housing and drivingly connected to the rotating impeller;

[0010] recessed portions disposed circumferentially spaced apart on the outer periphery of the housing;

[0011] a plunger movably disposed in the recessed portion and a push plate disposed on an outer surface of the plunger;

[0012] a plurality of hydraulic flow paths disposed in the housing at circumferential intervals, the plurality of hydraulic flow paths respectively communicating with the hydraulic pump and each of the recessed portions;

[0013] An eccentric flow divider plate is arranged on the plurality of hydraulic flow paths, a notch is arranged on the outer periphery of the eccentric flow divider plate to allow one of the hydraulic flow paths to communicate, the center of gravity of the eccentric flow divider plate and the notch are respectively located on both sides of the central axis thereof, and the eccentric flow divider plate can rotate around the central axis;

[0014] When the shell is tilted, the eccentric diverter plate rotates to a state where the notch is at a higher position and the center of gravity is at a lower position, so as to connect one of the hydraulic flow paths and disconnect the other hydraulic flow paths, thereby driving the plunger and push plate corresponding to the connected hydraulic flow path to move radially outward.

[0015] In some embodiments, it also includes a non-magnetic outer cylinder, a drive shaft rotatably disposed in the non-magnetic outer cylinder and transmission-connected to the hydraulic pump, the rotating impeller is rotatably mounted on the non-magnetic outer cylinder, and the drive shaft is magnetically coupled to the rotating impeller.

[0016] In some embodiments, a cone-shaped rod is connected to the upper end of the non-magnetic outer cylinder.

[0017] In some embodiments, the upper portion of the non-magnetic outer cylinder is sleeved with an upper alloy inner ring and the lower portion is sleeved with a lower alloy inner ring, the upper end of the rotating impeller is provided with an upper alloy outer ring rotatably sleeved on the upper alloy inner ring, and the lower end is provided with a lower alloy outer ring rotatably sleeved on the lower alloy inner ring.

[0018] In some embodiments, the upper end of the drive shaft is mounted on the non-magnetic outer cylinder via a sliding bearing, and the lower end of the drive shaft is mounted on the non-magnetic outer cylinder via a lower bearing.

[0019] In some embodiments, the shell includes an upper outer cylinder, in which an oil storage cylinder and a rubber sleeve mounted on the oil storage cylinder are disposed, an annular hydraulic oil chamber is formed between the rubber sleeve and the oil storage cylinder, and the hydraulic oil chamber is connected to each of the hydraulic flow paths.

[0020] In some embodiments, an annular step is formed in the lower portion of the upper outer cylinder, inlets corresponding to the plurality of hydraulic paths are provided on the annular step, and the eccentric diverter plate is provided between the lower end of the oil storage cylinder and the annular step.

[0021] In some embodiments, a pump end joint, a flow conversion joint and a bypass joint are provided between the hydraulic pump and the oil storage cylinder, and the hydraulic pump and the oil storage cylinder are connected through the main flow path provided in the pump end joint, the flow conversion joint and the bypass joint.

[0022] In some embodiments, the invention further comprises a central axis connected to the lower end of the upper outer cylinder, and a lower outer cylinder rotatably sleeved on the central axis, wherein the recessed portion is disposed on the lower outer cylinder.

[0023] In some embodiments, it also includes an inner sleeve fixedly mounted on the central shaft and an upper oil seal shell rotatably mounted on the inner sleeve via a sleeve bearing, the upper end of the lower outer cylinder is fixedly mounted on the upper oil seal shell, and the hydraulic flow path is respectively arranged in the central shaft, the inner sleeve and the lower outer cylinder.

[0024] In some embodiments, an upper lubricating oil chamber located on the upper side of the sleeve bearing is formed between the upper oil seal housing and the inner sleeve.

[0025] In some embodiments, a diverter ring is provided between the upper oil seal housing and the lower outer cylinder, and a plurality of radial flow paths arranged axially at intervals are provided in the diverter ring, and the plurality of radial flow paths are connected to each hydraulic flow path in a one-to-one aligned manner.

[0026] In some embodiments, a limit block is provided at the upper end and the lower end of the recessed portion, respectively, and a radially retractable limit spring is provided between the limit block and the pushing plate; and / or a composite spring is provided between the pushing plate and the plunger.

[0027] In some embodiments, the lower end of the central shaft is connected to a lower joint, the upper portion of the lower joint is sleeved with a lower oil seal housing, and a lower lubricating oil chamber is formed between the lower oil seal housing and the lower joint.

[0028] In some embodiments, wear-resistant bosses are provided on both side end surfaces of the eccentric diverter disc; and / or, the eccentric diverter disc is provided with an eccentric hole.

[0029] Through the above technical scheme, the automatic rotation of the eccentric diverter disk due to downhole gravity is relied upon to distribute the downhole high-pressure fluid, control the action of the plunger, and realize closed-loop automatic operation; the whole set of tools has no electronic devices, and unlike the existing mechatronic anti-skew tools, there is no temperature limit, and it can fully adapt to normal temperature, high temperature, and ultra-high temperature well environments; at the same time, due to the reduction of electronic devices, the tool manufacturing cost will also be greatly reduced; the downhole closed-loop anti-skew tool can meet the downhole closed-loop anti-skew work needs during drilling, while having the characteristics of low cost and easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1-Figure 4They are cross-sectional views through the central axis at various positions of the downhole closed-loop anti-deflection tool described in the implementation scheme of the present invention;

[0031] Figure 5-Figure 10 They are Figure 1-Figure 4 A cross-sectional view perpendicular to the central axis at each position in the figure;

[0032] Fig.11 This is a schematic diagram of the structure of the eccentric diverter disc described in the implementation mode of this scheme;

[0033] Fig.12 It is a cross-sectional view of the eccentric diverter disc described in the implementation mode of this scheme.

[0034] Description of Reference Numerals

[0035] 1-upper outer cylinder; 2-cone head rod 2; 3-sliding bearing; 4-upper alloy inner ring; 5-upper alloy outer ring; 6-driving shaft; 7-rotating impeller; 8-lower alloy outer ring; 9-lower alloy inner ring; 10-non-magnetic outer cylinder; 11-lower bearing; 12-disc spring; 13-compression rubber spring; 14-screw; 15-conversion joint; 16-hydraulic pump; 17-pump end joint; 18-conversion joint; 19-bypass joint; 20-upper fixed sleeve; 21-oil storage cylinder; 22-anti-impact sleeve; 23-screw; 24-rubber sleeve; 25-lower Fixed sleeve; 26-eccentric diverter plate; 27-sealing plug; 28-rectangular ring; 29-center shaft; 30-inner sleeve; 31-upper oil seal ring; 32-upper oil seal housing; 33-cone plug; 34-sleeve bearing; 35-oil-isolating rubber ring; 36-lower outer cylinder; 37-diverter ring; 38-limiting block; 39-orifice plate; 40-bolt; 41-limiting spring; 42-plunger; 43-compound spring; 44-pushing plate; 45-anti-drop ring; 46-sealing rubber ring; 47-lower oil seal housing; 48-oil sealing ring; 49-lower joint. DETAILED DESCRIPTION

[0036] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0037] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0038] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0040] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0041] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0042] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0043] Embodiment 1

[0044] refer to Figure 1-Figure 12 As shown, this solution provides a downhole closed-loop anti-deflection tool, which includes:

[0045] A housing, two ends of which can be connected to a drill rod and a drill bit respectively;

[0046] A rotary impeller 7 disposed in the housing, wherein the rotary impeller 7 can be driven to rotate by drilling fluid;

[0047] A hydraulic pump 16 disposed in the housing and drivingly connected to the rotating impeller 7;

[0048] recessed portions disposed circumferentially spaced apart on the outer periphery of the housing;

[0049] a plunger 42 movably disposed in the recess and a push plate 44 disposed on an outer surface of the plunger 42;

[0050] A plurality of hydraulic flow paths spaced circumferentially in the housing, the plurality of hydraulic flow paths respectively connecting the hydraulic pump 16 and each of the recessed portions;

[0051] An eccentric flow divider plate 26 is arranged on the plurality of hydraulic flow paths, a notch is arranged on the outer periphery of the eccentric flow divider plate to allow one of the hydraulic flow paths to communicate, the center of gravity of the eccentric flow divider plate 26 and the notch are respectively located on both sides of the central axis 29 line thereof, and the eccentric flow divider plate 26 can rotate around the central axis 29 line;

[0052] When the shell is tilted, the eccentric diverter plate 26 rotates to a state where the notch is at a higher position and the center of gravity is at a lower position, so as to connect one of the hydraulic flow paths and disconnect the other hydraulic flow paths, thereby driving the plunger 42 and the push plate 44 corresponding to the connected hydraulic flow path to move radially outward.

[0053] The main function of the downhole closed-loop anti-deflection tool is to prevent the drill bit from lateral deflection during drilling.

[0054] The shell is generally tubular and is formed by connecting multiple sections of tubular structures. During use, the shell is arranged to extend in a vertical direction, and when tilted, its central axis forms an angle with respect to the vertical direction.

[0055] The rotary impeller 7 is coaxially arranged in the housing and can rotate under the action of the drilling fluid passing through the housing, thereby transmitting torque to the hydraulic pump 16 to drive the hydraulic pump 16 to operate. The hydraulic pump 16 can deliver hydraulic oil to the hydraulic flow path to act on the plunger 42 through the hydraulic oil.

[0056] The plunger 42 and the push plate 44 are disposed in a recessed portion on the outer periphery of the housing, and can move radially outward under the action of hydraulic oil, so that the push plate 44 protrudes to support on the wellbore wall.

[0057] When the drill rod or drill bit is deflected, the shell is also deflected, for example, deflected toward the first direction. Due to the deflection of the shell, the central axis of the eccentric diverter plate 26 also forms a deflection angle with the vertical axis. In addition, the eccentric center of gravity of the eccentric diverter plate 26 is eccentrically set, so that the eccentric diverter plate 26 rotates under the action of gravity, and the position of its center of gravity is at a lower position, while the position of the notch (relatively far away from the center of gravity) is at a higher position. The notch is also located in the first direction. The notch connects to the corresponding hydraulic flow path, so that the plunger 42 located in the first direction moves radially outward under the pressure of the hydraulic oil, thereby pushing the push plate 44 to extend and support on the drilling wall. The other push plates 44 are not extended. Therefore, the extended push plates 44 cause the shell to return to the non-deflected position where the central axis extends vertically.

[0058] For example, when the drill pipe or drill bit deviates to the east, the center of gravity of the eccentric diverter plate 26 rotates to the west side of the central axis, and the notch rotates to the east side of the central axis to connect the hydraulic flow path on the east side, so that the plunger 42 and the push plate 44 extend outward and are supported on the drilling wall, thereby the reaction force of the drilling wall causes the shell and the drill pipe or drill bit to move westward, correcting the deviated state.

[0059] In this solution, the automatic rotation of the eccentric diverter disk due to downhole gravity is relied upon to distribute the downhole high-pressure fluid, control the plunger movement, and realize closed-loop automatic operation. The entire set of tools has no electronic devices, and unlike existing mechatronic anti-skew tools, there is no temperature limit, and it can fully adapt to normal temperature, high temperature, and ultra-high temperature well environments. At the same time, due to the reduction of electronic devices, the tool manufacturing cost will also be greatly reduced. The downhole closed-loop anti-skew tool can meet the downhole closed-loop anti-skew work needs during drilling, while having the characteristics of low cost and easy maintenance.

[0060] Among them, the downhole closed-loop anti-deflection tool also includes a non-magnetic outer cylinder 10, a drive shaft 6 rotatably arranged in the non-magnetic outer cylinder 10 and transmission-connected to the hydraulic pump 16, and the rotating impeller 7 is rotatably sleeved on the non-magnetic outer cylinder 10, and the drive shaft 6 is magnetically coupled with the rotating impeller 7. The non-magnetic outer cylinder 10 is used to isolate the hydraulic pump 16, the drive shaft 6 and the rotating impeller 7 to better protect the hydraulic pump 16 and the drive shaft 6 to avoid or reduce the impact of the drilling fluid. The drive shaft 6 can be made of magnetic material or inlaid with magnets, and the similar rotating impeller 7 can be made of magnetic material or inlaid with magnets. The drive shaft 6 and the rotating impeller 7 are magnetically coupled to each other, and the rotating impeller 7 also acts magnetically on the drive shaft 6 when rotating to drive the drive shaft 6 to rotate. The drive shaft 6 is coaxially connected to the hydraulic pump 16 to transmit torque to the hydraulic pump 16.

[0061] The upper end of the non-magnetic outer cylinder 10 is connected with a cone head rod 2. The upper end of the cone head rod 2 is formed into a cone shape to guide the drilling fluid to flow around it, so as to impact the rotating impeller 7. The cone head rod 2 is a step-shaped shaft-like part, and four ribs of rubber are vulcanized at the step to engage with the inner circumference of the shell (such as the upper outer cylinder 1). The lower end of the cone head rod 2 is processed with threads to connect with the non-magnetic outer cylinder 10 through threads.

[0062] The upper part of the non-magnetic outer cylinder 10 is sleeved with an upper alloy inner ring 4 and the lower part is sleeved with a lower alloy inner ring 9, the upper end of the rotating impeller 7 is provided with an upper alloy outer ring 5 rotatably sleeved on the upper alloy inner ring 4 and the lower end is provided with a lower alloy outer ring 8 rotatably sleeved on the lower alloy inner ring 9. The upper alloy inner ring 4 and the upper alloy outer ring 5, the lower alloy inner ring 9 and the lower alloy outer ring 8 form a structure similar to a bearing, so that the rotating impeller 7 is rotatably arranged on the outer periphery of the non-magnetic outer cylinder 10.

[0063] The upper end of the driving shaft 6 is mounted on the non-magnetic outer cylinder 10 via a sliding bearing 3 , and the lower end of the driving shaft 6 is mounted on the non-magnetic outer cylinder 10 via a lower bearing 11 .

[0064] Among them, the non-magnetic outer cylinder 10 is a threaded part at both ends, the lower end is screwed to the conversion joint 15, the outer circle step is set with the rotating impeller 7, and the inner hole is installed with the sliding bearing 3, the drive shaft 6, and the lower bearing 11. The inner ring of the sliding bearing 3 is set with the drive shaft 6, and the outer ring is set with the non-magnetic outer cylinder 10. The outer ring of the lower bearing 11 is set with the non-magnetic outer cylinder 10, and the inner ring is set with the drive shaft 6. The drive shaft 6 is a magnetic part with a surface electrochemically covered with magnetic powder. A square hole is processed on one end face to insert the hydraulic pump 16, and a disc spring 12 and a compression rubber spring 13 are set on the outer circle position. The end face of one end of the disc spring 12 engages with the boss end face of the drive shaft 6, and the end face of one end engages with the compression rubber spring 13, and forms compression when the non-magnetic outer cylinder 10 is threadedly connected with the conversion joint 15. The conversion joint 15 is partially sleeved on the upper end of the hydraulic pump 16 and is screwed to the hydraulic pump 16 by a screw 14. In addition, the lower end of the hydraulic pump 16 is sleeved with a converter joint 18 connected to the conversion joint 15 , and the conversion joint 15 and the converter joint 18 form a seal at the lower end of the non-magnetic outer cylinder 10 , thereby forming a sealed space inside the non-magnetic outer cylinder 10 .

[0065] The housing includes an upper outer cylinder 1, in which an oil storage cylinder 21 and a rubber sleeve 24 sleeved on the oil storage cylinder 21 are arranged. An annular hydraulic oil chamber is formed between the rubber sleeve 24 and the oil storage cylinder 21, and the hydraulic oil chamber is connected to each of the hydraulic flow paths. Figure 2As shown, the outer diameters of the two ends of the oil storage barrel 21 are relatively large, an annular groove is formed on the outer periphery of the middle part, and a hydraulic oil chamber is formed between the middle part and the rubber sleeve 24. The hydraulic oil chamber can store a certain volume of hydraulic oil so that the hydraulic pump 16 can deliver it to the corresponding recessed part and act on the plunger 42. Oil paths are formed in the two end parts of the oil storage barrel 21 to connect the oil paths to other structures on the upper and lower sides of the oil storage barrel 21 respectively.

[0066] An anti-collision sleeve 22 is embedded and installed in the inner hole of the left end of the oil storage cylinder 21. The anti-collision sleeve 22 is a cylindrical part with a tapered inner hole. Annular grooves are arranged on the outer periphery of both ends of the oil storage cylinder 21, and annular protrusions are arranged on the inner periphery of both ends of the rubber sleeve 24. The annular protrusions are respectively accommodated in the two annular grooves. The upper fixing sleeve 20 and the lower fixing sleeve 25 are respectively sleeved on both ends of the rubber sleeve 24 to press the rubber sleeve 24 onto the oil storage cylinder 21.

[0067] Among them, an annular step is formed in the lower part of the upper outer cylinder 1, and the annular step is provided with inlets corresponding to the plurality of hydraulic flow paths, and the eccentric diverter disc 26 is provided between the lower end of the oil storage cylinder 21 and the annular step. There is a certain gap between the eccentric diverter disc 26, the oil storage cylinder 21 and the annular step, which allows a small amount of hydraulic oil to pass through the gap and reach the center hole of the upper outer cylinder 1. When the housing returns from the deflected state to the vertical state, the originally extended push plate 44 and the plunger 42 move radially inward under the action of the drilling wall, so that the hydraulic oil returns along the hydraulic flow path. At this time, due to being in a non-deflected state, the eccentric diverter disc 26 may not rotate in a larger range than before, and the hydraulic oil can return to the hydraulic oil chamber through the gap. If the gap has been staggered, the hydraulic oil can enter the center hole of the upper outer cylinder 1 through the gap between the eccentric diverter disc 26 and the annular step of the upper outer cylinder 1.

[0068] In addition, a pump end joint 17, a flow conversion joint 18 and a bypass joint 19 are provided between the hydraulic pump 16 and the oil storage cylinder 21, and the hydraulic pump 16 and the oil storage cylinder 21 are connected through the main flow path provided in the pump end joint 17, the flow conversion joint 18 and the bypass joint 19. A section of the main flow path can be provided in each of the pump end joint 17, the flow conversion joint 18 and the bypass joint 19 to connect the hydraulic pump 16 to the oil path on the oil storage cylinder 21. Figure 2 As shown, a central hole is provided in the bypass joint 19, and the central hole bypasses the surrounding annulus through radial through holes to allow the drilling fluid in the annulus to enter the bypass joint 19 and flow further downward. An elongated channel is processed inside the bypass joint 19, one channel is a high-pressure oil output channel, and the other is a low-pressure end oil return channel. The two ends of the high-pressure oil output channel and the low-pressure end oil return channel are respectively connected to the conversion joint 18 and the oil storage cylinder 21.

[0069] In addition, part of the upper outer cylinder 1 is provided with part of the hydraulic flow path, and is provided with a radial blind hole communicating with the hydraulic flow path, and the radial blind hole is sealed by a sealing plug 27 .

[0070] In addition, the downhole closed-loop anti-deflection tool also includes a central shaft 29 connected to the lower end of the upper outer cylinder 1, and a lower outer cylinder 36 rotatably sleeved on the central shaft 29, and the lower outer cylinder 36 is provided with the recessed portion. A portion of the hydraulic flow path is provided in the central shaft 29, and a rectangular ring 28 surrounding the hydraulic flow path is provided between the central shaft 29 and the upper outer cylinder 1 to improve the sealing effect. The lower outer cylinder 36 can rotate relative to the central shaft 29 to allow the push plate 44 to rotate relative to the upper outer cylinder 1 and the central shaft 29, so as to avoid the downhole closed-loop anti-deflection tool from getting stuck when following the drill pipe rotation.

[0071] In addition, the downhole closed-loop anti-deflection tool also includes an inner sleeve 30 fixedly sleeved on the central shaft 29 and an upper oil seal housing 32 rotatably sleeved on the inner sleeve 30 through a sleeve bearing 34, the upper end of the lower outer cylinder 36 is fixedly sleeved on the upper oil seal housing 32, and the central shaft 29, the inner sleeve 30, and the lower outer cylinder 36 are respectively provided with the hydraulic flow path. The inner sleeve 30 is connected to the lower outer cylinder 26, the upper oil seal housing 32 is connected to the central shaft 29, and a sleeve bearing 34 is provided between the inner sleeve 30 and the upper oil seal housing 32 to realize the rotation between the two.

[0072] Among them, an upper lubricating oil chamber located on the upper side of the sleeve bearing 34 is formed between the upper oil seal housing 32 and the inner sleeve 30. A sealing ring groove is processed on the inner inclined surface of the inner sleeve 30, and a sealing ring is installed. An upper oil seal ring 31 and an upper oil seal housing 32 are installed on the outer circle of the inner sleeve 30. The upper oil seal ring 31, the upper oil seal housing 32, the inner sleeve 30, and the oil-isolating rubber ring 35 form an upper lubricating oil chamber, and the interior is filled with lubricating oil through the tapered hole on the upper oil seal housing 32 (sealed by the tapered plug 33) to provide lubrication for the sleeve bearing 34.

[0073] A flow divider ring 37 is provided between the upper oil seal housing 32 and the lower outer cylinder 36. The flow divider ring 37 is provided with a plurality of radial flow paths arranged axially at intervals, and the plurality of radial flow paths are connected to each hydraulic flow path in a one-to-one manner. The radial flow paths in the flow divider ring 37 are respectively connected to each hydraulic flow path in the inner sleeve 30, and are respectively connected to each hydraulic flow path in the lower outer cylinder 36.

[0074] Among them, the upper and lower ends of the recessed part are respectively provided with limit blocks 38, and a radially retractable limit spring 41 is provided between the limit block 38 and the push plate 44; and / or, a composite spring 43 is provided between the push plate 44 and the plunger 42. The limit block 38 is a square part, which is connected to the orifice plate 39 by bolts 40, and the orifice plate 39 is inserted in the stepped inner groove of the lower outer cylinder 36. A limit spring 41 is installed between the limit block 38 and the push plate 44. There are two groups of limit blocks 38, limit springs 41, orifice plates 39, and bolts 40, which are respectively installed at both ends of the push plate 44. The push plate 44 is a long strip part with a superhard material such as PDC or cemented carbide inlaid on the surface and a square groove inside. Both ends extend out, and the limit is achieved by the limit spring 41, the limit block 38, etc.

[0075] The plunger 42 is a rectangular boss part, which is installed in the recessed part in the lower outer tube 36, with the upper top surface close to the push plate 44, and the lower bottom surface connected to the hydraulic flow path of the lower outer tube 36. A composite spring 43 is installed between the top sides of the plunger 42 and the push plate 44. The composite spring 43 is an elastic combination of a columnar rubber and a compression spring, which is used to stably push the push plate 44 to move.

[0076] In addition, the lower end of the central shaft 29 is connected to a lower joint 49, and the upper part of the lower joint 49 is sleeved with a lower oil seal housing 47, and a lower lubricating oil chamber is formed between the lower oil seal housing 47 and the lower joint 49. The lower oil seal housing 47 is a T-shaped cylindrical part, and a tapered threaded hole is processed in the radial direction of the outer circle, and a tapered hole is installed in the hole. The sealing rubber ring 46, the lower oil seal housing 47, and the oil sealing ring 48 are sleeved on the outer circle surface of the lower joint 49 to form a sealed cavity, and the cavity is filled with lubricating oil through the tapered hole on the lower oil seal housing 47. The oil sealing ring 48 is a part with a sealing ring groove processed on the inner inclined surface and a sealing ring installed, and the inner inclined surface is close to the inclined surface of the lower joint 49. The lower joint 49 is a joint with threads at both ends, and the left end thread is connected to the central shaft 29, and the end face is close to the anti-drop ring 45, which limits the anti-drop ring 45.

[0077] Among them, reference Fig.11 and Fig.12 As shown, the eccentric flow dividing plate 26 is provided with wear-resistant bosses on both side end surfaces; and / or, the eccentric flow dividing plate 26 is provided with an eccentric hole. The eccentric flow dividing plate 26 is inlaid with columnar hard alloy on both side surfaces to form wear-resistant bosses, one side of the hard alloy contacts the end surface of the oil storage cylinder 21, and one end contacts the columnar hard alloy on the inner step surface of the upper outer cylinder 1.

[0078] Embodiment 2

[0079] refer to Figure 1-Figure 12 As shown, this solution provides a downhole closed-loop anti-deflection tool, which includes:

[0080] A housing, two ends of which can be connected to a drill rod and a drill bit respectively;

[0081] A rotary impeller 7 disposed in the housing, wherein the rotary impeller 7 can be driven to rotate by drilling fluid;

[0082] A hydraulic pump 16 disposed in the housing and drivingly connected to the rotating impeller 7;

[0083] recessed portions disposed circumferentially spaced apart on the outer periphery of the housing;

[0084] a plunger 42 movably disposed in the recess and a push plate 44 disposed on an outer surface of the plunger 42;

[0085] A plurality of hydraulic flow paths spaced circumferentially in the housing, the plurality of hydraulic flow paths respectively connecting the hydraulic pump 16 and each of the recessed portions;

[0086] An eccentric flow divider plate 26 is arranged on the plurality of hydraulic flow paths, a notch is arranged on the outer periphery of the eccentric flow divider plate to allow one of the hydraulic flow paths to communicate, the center of gravity of the eccentric flow divider plate 26 and the notch are respectively located on both sides of the central axis 29 line thereof, and the eccentric flow divider plate 26 can rotate around the central axis 29 line;

[0087] When the shell is tilted, the eccentric diverter plate 26 rotates to a state where the notch is at a higher position and the center of gravity is at a lower position, so as to connect one of the hydraulic flow paths and disconnect the other hydraulic flow paths, thereby driving the plunger 42 and the push plate 44 corresponding to the connected hydraulic flow path to move radially outward.

[0088] The main function of the downhole closed-loop anti-deflection tool is to prevent the drill bit from lateral deflection during drilling.

[0089] The shell is generally tubular and is formed by connecting multiple sections of tubular structures. During use, the shell is arranged to extend in a vertical direction, and when tilted, its central axis forms an angle with respect to the vertical direction.

[0090] The rotary impeller 7 is coaxially arranged in the housing and can rotate under the action of the drilling fluid passing through the housing, thereby transmitting torque to the hydraulic pump 16 to drive the hydraulic pump 16 to operate. The hydraulic pump 16 can deliver hydraulic oil to the hydraulic flow path to act on the plunger 42 through the hydraulic oil.

[0091] The plunger 42 and the push plate 44 are disposed in a recessed portion on the outer periphery of the housing, and can move radially outward under the action of hydraulic oil, so that the push plate 44 protrudes to support on the wellbore wall.

[0092] When the drill rod or drill bit is deflected, the shell is also deflected, for example, deflected toward the first direction. Due to the deflection of the shell, the central axis of the eccentric diverter plate 26 also forms a deflection angle with the vertical axis. In addition, the eccentric center of gravity of the eccentric diverter plate 26 is eccentrically set, so that the eccentric diverter plate 26 rotates under the action of gravity, and the position of its center of gravity is at a lower position, while the position of the notch (relatively far away from the center of gravity) is at a higher position. The notch is also located in the first direction. The notch connects to the corresponding hydraulic flow path, so that the plunger 42 located in the first direction moves radially outward under the pressure of the hydraulic oil, thereby pushing the push plate 44 to extend and support on the drilling wall. The other push plates 44 are not extended. Therefore, the extended push plates 44 cause the shell to return to the non-deflected position where the central axis extends vertically.

[0093] For example, when the drill pipe or drill bit deviates to the east, the center of gravity of the eccentric diverter plate 26 rotates to the west side of the central axis, and the notch rotates to the east side of the central axis to connect the hydraulic flow path on the east side, so that the plunger 42 and the push plate 44 extend outward and are supported on the drilling wall, thereby the reaction force of the drilling wall causes the shell and the drill pipe or drill bit to move westward, correcting the deviated state.

[0094] In this solution, the automatic rotation of the eccentric diverter disk due to downhole gravity is relied upon to distribute the downhole high-pressure fluid, control the plunger movement, and realize closed-loop automatic operation. The entire set of tools has no electronic devices, and unlike existing mechatronic anti-skew tools, there is no temperature limit, and it can fully adapt to normal temperature, high temperature, and ultra-high temperature well environments. At the same time, due to the reduction of electronic devices, the tool manufacturing cost will also be greatly reduced. The downhole closed-loop anti-skew tool can meet the downhole closed-loop anti-skew work needs during drilling, while having the characteristics of low cost and easy maintenance.

[0095] Among them, the downhole closed-loop anti-deflection tool also includes a non-magnetic outer cylinder 10, a drive shaft 6 rotatably arranged in the non-magnetic outer cylinder 10 and transmission-connected to the hydraulic pump 16, and the rotating impeller 7 is rotatably sleeved on the non-magnetic outer cylinder 10, and the drive shaft 6 is magnetically coupled with the rotating impeller 7. The non-magnetic outer cylinder 10 is used to isolate the hydraulic pump 16, the drive shaft 6 and the rotating impeller 7 to better protect the hydraulic pump 16 and the drive shaft 6 to avoid or reduce the impact of the drilling fluid. The drive shaft 6 can be made of magnetic material or inlaid with magnets, and the similar rotating impeller 7 can be made of magnetic material or inlaid with magnets. The drive shaft 6 and the rotating impeller 7 are magnetically coupled to each other, and the rotating impeller 7 also acts magnetically on the drive shaft 6 when rotating to drive the drive shaft 6 to rotate. The drive shaft 6 is coaxially connected to the hydraulic pump 16 to transmit torque to the hydraulic pump 16.

[0096] The upper end of the non-magnetic outer cylinder 10 is connected with a cone head rod 2. The upper end of the cone head rod 2 is formed into a cone shape to guide the drilling fluid to flow around it, so as to impact the rotating impeller 7. The cone head rod 2 is a step-shaped shaft-like part, and four ribs of rubber are vulcanized at the step to engage with the inner circumference of the shell (such as the upper outer cylinder 1). The lower end of the cone head rod 2 is processed with threads to connect with the non-magnetic outer cylinder 10 through threads.

[0097] The upper part of the non-magnetic outer cylinder 10 is sleeved with an upper alloy inner ring 4 and the lower part is sleeved with a lower alloy inner ring 9, the upper end of the rotating impeller 7 is provided with an upper alloy outer ring 5 rotatably sleeved on the upper alloy inner ring 4 and the lower end is provided with a lower alloy outer ring 8 rotatably sleeved on the lower alloy inner ring 9. The upper alloy inner ring 4 and the upper alloy outer ring 5, the lower alloy inner ring 9 and the lower alloy outer ring 8 form a structure similar to a bearing, so that the rotating impeller 7 is rotatably arranged on the outer periphery of the non-magnetic outer cylinder 10.

[0098] The upper end of the driving shaft 6 is mounted on the non-magnetic outer cylinder 10 via a sliding bearing 3 , and the lower end of the driving shaft 6 is mounted on the non-magnetic outer cylinder 10 via a lower bearing 11 .

[0099] Among them, the non-magnetic outer cylinder 10 is a threaded part at both ends, the lower end is screwed to the conversion joint 15, the outer circle step is set with the rotating impeller 7, and the inner hole is installed with the sliding bearing 3, the drive shaft 6, and the lower bearing 11. The inner ring of the sliding bearing 3 is set with the drive shaft 6, and the outer ring is set with the non-magnetic outer cylinder 10. The outer ring of the lower bearing 11 is set with the non-magnetic outer cylinder 10, and the inner ring is set with the drive shaft 6. The drive shaft 6 is a magnetic part with a surface electrochemically covered with magnetic powder. A square hole is processed on one end face to insert the hydraulic pump 16, and a disc spring 12 and a compression rubber spring 13 are set on the outer circle position. The end face of one end of the disc spring 12 engages with the boss end face of the drive shaft 6, and the end face of one end engages with the compression rubber spring 13, and forms compression when the non-magnetic outer cylinder 10 is threadedly connected with the conversion joint 15. The conversion joint 15 is partially sleeved on the upper end of the hydraulic pump 16 and is screwed to the hydraulic pump 16 by a screw 14. In addition, the lower end of the hydraulic pump 16 is sleeved with a converter joint 18 connected to the conversion joint 15 , and the conversion joint 15 and the converter joint 18 form a seal at the lower end of the non-magnetic outer cylinder 10 , thereby forming a sealed space inside the non-magnetic outer cylinder 10 .

[0100] The housing includes an upper outer tube 1, a tubular oil storage structure is provided in the upper outer tube 1, an annular hydraulic oil chamber is formed inside the oil storage structure, and the hydraulic oil chamber is connected to each of the hydraulic flow paths. The oil storage structure can be composed of an inner tube, an outer tube and annular end plates at both ends.

[0101] Among them, an annular step is formed in the lower part of the upper outer cylinder 1, and the annular step is provided with inlets corresponding to the plurality of hydraulic flow paths, and the eccentric diverter disc 26 is provided between the lower end of the oil storage cylinder 21 and the annular step. There is a certain gap between the eccentric diverter disc 26, the oil storage cylinder 21 and the annular step, which allows a small amount of hydraulic oil to pass through the gap and reach the center hole of the upper outer cylinder 1. When the housing returns from the deflected state to the vertical state, the originally extended push plate 44 and the plunger 42 move radially inward under the action of the drilling wall, so that the hydraulic oil returns along the hydraulic flow path. At this time, due to being in a non-deflected state, the eccentric diverter disc 26 may not rotate in a larger range than before, and the hydraulic oil can return to the hydraulic oil chamber through the gap. If the gap has been staggered, the hydraulic oil can enter the center hole of the upper outer cylinder 1 through the gap between the eccentric diverter disc 26 and the annular step of the upper outer cylinder 1.

[0102] In addition, a pump end joint 17, a flow conversion joint 18 and a bypass joint 19 are provided between the hydraulic pump 16 and the oil storage cylinder 21, and the hydraulic pump 16 and the oil storage cylinder 21 are connected through the main flow path provided in the pump end joint 17, the flow conversion joint 18 and the bypass joint 19. A section of the main flow path can be provided in each of the pump end joint 17, the flow conversion joint 18 and the bypass joint 19 to connect the hydraulic pump 16 to the oil path on the oil storage cylinder 21. Figure 2 As shown, a central hole is provided in the bypass joint 19, and the central hole bypasses the surrounding annulus through radial through holes to allow the drilling fluid in the annulus to enter the bypass joint 19 and flow further downward. An elongated channel is processed inside the bypass joint 19, one channel is a high-pressure oil output channel, and the other is a low-pressure end oil return channel. The two ends of the high-pressure oil output channel and the low-pressure end oil return channel are respectively connected to the conversion joint 18 and the oil storage cylinder 21.

[0103] In addition, part of the upper outer cylinder 1 is provided with part of the hydraulic flow path, and is provided with a radial blind hole communicating with the hydraulic flow path, and the radial blind hole is sealed by a sealing plug 27 .

[0104] In addition, the downhole closed-loop anti-deflection tool also includes a central shaft 29 connected to the lower end of the upper outer cylinder 1, and a lower outer cylinder 36 rotatably sleeved on the central shaft 29, and the lower outer cylinder 36 is provided with the recessed portion. A portion of the hydraulic flow path is provided in the central shaft 29, and a rectangular ring 28 surrounding the hydraulic flow path is provided between the central shaft 29 and the upper outer cylinder 1 to improve the sealing effect. The lower outer cylinder 36 can rotate relative to the central shaft 29 to allow the push plate 44 to rotate relative to the upper outer cylinder 1 and the central shaft 29, so as to avoid the downhole closed-loop anti-deflection tool from getting stuck when following the drill pipe rotation.

[0105] In addition, the downhole closed-loop anti-deflection tool also includes an inner sleeve 30 fixedly sleeved on the central shaft 29 and an upper oil seal housing 32 rotatably sleeved on the inner sleeve 30 through a sleeve bearing 34, the upper end of the lower outer cylinder 36 is fixedly sleeved on the upper oil seal housing 32, and the central shaft 29, the inner sleeve 30, and the lower outer cylinder 36 are respectively provided with the hydraulic flow path. The inner sleeve 30 is connected to the lower outer cylinder 26, the upper oil seal housing 32 is connected to the central shaft 29, and a sleeve bearing 34 is provided between the inner sleeve 30 and the upper oil seal housing 32 to realize the rotation between the two.

[0106] Among them, an upper lubricating oil chamber located on the upper side of the sleeve bearing 34 is formed between the upper oil seal housing 32 and the inner sleeve 30. A sealing ring groove is processed on the inner inclined surface of the inner sleeve 30, and a sealing ring is installed. An upper oil seal ring 31 and an upper oil seal housing 32 are installed on the outer circle of the inner sleeve 30. The upper oil seal ring 31, the upper oil seal housing 32, the inner sleeve 30, and the oil-isolating rubber ring 35 form an upper lubricating oil chamber, and the interior is filled with lubricating oil through the tapered hole on the upper oil seal housing 32 (sealed by the tapered plug 33) to provide lubrication for the sleeve bearing 34.

[0107] A flow divider ring 37 is provided between the upper oil seal housing 32 and the lower outer cylinder 36. The flow divider ring 37 is provided with a plurality of radial flow paths arranged axially at intervals, and the plurality of radial flow paths are connected to each hydraulic flow path in a one-to-one manner. The radial flow paths in the flow divider ring 37 are respectively connected to each hydraulic flow path in the inner sleeve 30, and are respectively connected to each hydraulic flow path in the lower outer cylinder 36.

[0108] Among them, the upper and lower ends of the recessed part are respectively provided with limit blocks 38, and a radially retractable limit spring 41 is provided between the limit block 38 and the push plate 44; and / or, a composite spring 43 is provided between the push plate 44 and the plunger 42. The limit block 38 is a square part, which is connected to the orifice plate 39 by bolts 40, and the orifice plate 39 is inserted in the stepped inner groove of the lower outer cylinder 36. A limit spring 41 is installed between the limit block 38 and the push plate 44. There are two groups of limit blocks 38, limit springs 41, orifice plates 39, and bolts 40, which are respectively installed at both ends of the push plate 44. The push plate 44 is a long strip part with a superhard material such as PDC or cemented carbide inlaid on the surface and a square groove inside. Both ends extend out, and the limit is achieved by the limit spring 41, the limit block 38, etc.

[0109] The plunger 42 is a rectangular boss part, which is installed in the recessed part in the lower outer tube 36, with the upper top surface close to the push plate 44, and the lower bottom surface connected to the hydraulic flow path of the lower outer tube 36. A composite spring 43 is installed between the top sides of the plunger 42 and the push plate 44. The composite spring 43 is an elastic combination of a columnar rubber and a compression spring, which is used to stably push the push plate 44 to move.

[0110] In addition, the lower end of the central shaft 29 is connected to a lower joint 49, and the upper part of the lower joint 49 is sleeved with a lower oil seal housing 47, and a lower lubricating oil chamber is formed between the lower oil seal housing 47 and the lower joint 49. The lower oil seal housing 47 is a T-shaped cylindrical part, and a tapered threaded hole is processed in the radial direction of the outer circle, and a tapered hole is installed in the hole. The sealing rubber ring 46, the lower oil seal housing 47, and the oil sealing ring 48 are sleeved on the outer circle surface of the lower joint 49 to form a sealed cavity, and the cavity is filled with lubricating oil through the tapered hole on the lower oil seal housing 47. The oil sealing ring 48 is a part with a sealing ring groove processed on the inner inclined surface and a sealing ring installed, and the inner inclined surface is close to the inclined surface of the lower joint 49. The lower joint 49 is a joint with threads at both ends, and the left end thread is connected to the central shaft 29, and the end face is close to the anti-drop ring 45, which limits the anti-drop ring 45.

[0111] Among them, reference Fig.11 and Fig.12 As shown, the eccentric flow dividing plate 26 is provided with wear-resistant bosses on both side end surfaces; and / or, the eccentric flow dividing plate 26 is provided with an eccentric hole. The eccentric flow dividing plate 26 is inlaid with columnar hard alloy on both side surfaces to form wear-resistant bosses, one side of the hard alloy contacts the end surface of the oil storage cylinder 21, and one end contacts the columnar hard alloy on the inner step surface of the upper outer cylinder 1.

[0112] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0113] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A downhole closed-loop anti-deflection tool, characterized in that: include: A housing, two ends of which can be connected to a drill rod and a drill bit respectively; A rotating impeller (7) disposed in the housing, wherein the rotating impeller (7) can be driven to rotate by drilling fluid; a hydraulic pump (16) disposed in the housing and drivingly connected to the rotating impeller (7); recessed portions disposed circumferentially spaced apart on the outer periphery of the housing; a plunger (42) movably disposed in the recessed portion and a push plate (44) disposed on an outer surface of the plunger (42); a plurality of hydraulic flow paths spaced circumferentially apart and arranged in the housing, the plurality of hydraulic flow paths respectively connecting the hydraulic pump (16) and each of the recessed portions; An eccentric flow divider plate (26) is arranged on the plurality of hydraulic flow paths, a notch is arranged on the outer periphery of the eccentric flow divider plate to allow one of the hydraulic flow paths to communicate, the center of gravity of the eccentric flow divider plate (26) and the notch are respectively located on both sides of the central axis (29) line thereof, and the eccentric flow divider plate (26) can rotate around the central axis (29) line; When the housing is tilted, the eccentric diverter disc (26) rotates to a state where the notch is at a higher position and the center of gravity is at a lower position, so as to connect one of the hydraulic flow paths and disconnect the other hydraulic flow paths, thereby driving the plunger (42) and the push plate (44) corresponding to the connected hydraulic flow path to move radially outward.

2. The downhole closed-loop anti-deflection tool according to claim 1, characterized in that: It also comprises a non-magnetic outer cylinder (10) and a drive shaft (6) rotatably arranged in the non-magnetic outer cylinder (10) and drivingly connected to the hydraulic pump (16); the rotating impeller (7) is rotatably sleeved on the non-magnetic outer cylinder (10); and the drive shaft (6) is magnetically coupled to the rotating impeller (7).

3. The downhole closed-loop anti-deflection tool according to claim 2, characterized in that: The upper end of the non-magnetic outer cylinder (10) is connected to a cone head rod (2).

4. The downhole closed-loop anti-deflection tool according to claim 2, characterized in that: The non-magnetic outer cylinder (10) has an upper alloy inner ring (4) sleeved on its upper part and a lower alloy inner ring (9) sleeved on its lower part; the rotating impeller (7) has an upper alloy outer ring (5) rotatably sleeved on the upper alloy inner ring (4) at its upper end and a lower alloy outer ring (8) rotatably sleeved on the lower alloy inner ring (9) at its lower end.

5. The downhole closed-loop anti-deflection tool according to claim 2, characterized in that: The upper end of the drive shaft (6) is mounted on the non-magnetic outer cylinder (10) via a sliding bearing (3), and the lower end of the drive shaft (6) is mounted on the non-magnetic outer cylinder (10) via a lower bearing (11).

6. The downhole closed-loop anti-deflection tool according to claim 1, characterized in that: The housing comprises an upper outer cylinder (1), an oil storage cylinder (21) and a rubber sleeve (24) sleeved on the oil storage cylinder (21) are arranged in the upper outer cylinder (1), an annular hydraulic oil chamber is formed between the rubber sleeve (24) and the oil storage cylinder (21), and the hydraulic oil chamber is connected to each of the hydraulic flow paths.

7. The downhole closed-loop anti-deflection tool according to claim 6, characterized in that: An annular step is formed in the lower portion of the upper outer cylinder (1), and inlets corresponding to the plurality of hydraulic flow paths are arranged on the annular step. The eccentric diverter plate (26) is arranged between the lower end of the oil storage cylinder (21) and the annular step.

8. The downhole closed-loop anti-deflection tool according to claim 6, characterized in that: A pump end joint (17), a flow conversion joint (18) and a bypass joint (19) are provided between the hydraulic pump (16) and the oil storage cylinder (21); the hydraulic pump (16) and the oil storage cylinder (21) are connected via a main flow path provided in the pump end joint (17), the flow conversion joint (18) and the bypass joint (19).

9. The downhole closed-loop anti-deflection tool according to claim 6, characterized in that: It also comprises a central axis (29) connected to the lower end of the upper outer cylinder (1), and a lower outer cylinder (36) rotatably sleeved on the central axis (29), wherein the lower outer cylinder (36) is provided with the recessed portion.

10. The downhole closed-loop anti-deflection tool according to claim 9, characterized in that: It also includes an inner sleeve (30) fixedly sleeved on the central shaft (29) and an upper oil seal shell (32) rotatably sleeved on the inner sleeve (30) via a sleeve bearing (34); the upper end of the lower outer cylinder (36) is fixedly sleeved on the upper oil seal shell (32); and the central shaft (29), the inner sleeve (30), and the lower outer cylinder (36) are respectively provided with the hydraulic flow path.

11. The downhole closed-loop anti-deflection tool according to claim 10, characterized in that: An upper lubricating oil chamber located on the upper side of the sleeve bearing (34) is formed between the upper oil seal housing (32) and the inner sleeve (30).

12. The downhole closed-loop anti-deflection tool according to claim 10, characterized in that: A flow divider ring (37) is provided between the upper oil seal housing (32) and the lower outer cylinder (36), and a plurality of radial flow paths arranged axially at intervals are provided in the flow divider ring (37), and the plurality of radial flow paths are connected to each hydraulic flow path in a one-to-one aligned manner.

13. The downhole closed-loop anti-deflection tool according to claim 10, characterized in that: A limit block (38) is provided at the upper end and the lower end of the recessed portion, respectively; a radially retractable limit spring (41) is provided between the limit block (38) and the push plate (44); and / or a composite spring (43) is provided between the push plate (44) and the plunger (42).

14. The downhole closed-loop anti-deflection tool according to claim 9, characterized in that: The lower end of the central shaft (29) is connected to a lower joint (49), the upper part of the lower joint (49) is sleeved with a lower oil seal housing (47), and a lower lubricating oil chamber is formed between the lower oil seal housing (47) and the lower joint (49).

15. The downhole closed-loop anti-deflection tool according to claim 1, characterized in that: Wear-resistant bosses are provided on both side end surfaces of the eccentric flow diverter disc (26); and / or, the eccentric flow diverter disc (26) is provided with an eccentric hole.

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