Recoverable integrated self-sealing well window sidetracking tool

Abstract

A recyclable integrated self-sealing well window sidetracking tool comprises a hollow milling cone, a guide bevel iron, a sealing anchor device and a well sealing device, wherein the sealing anchor device comprises a cylinder sleeve, a conical body, a stop tube and a slip arranged in the cylinder sleeve; the well sealing device comprises a connector, a piston outer tube, a stop tube, a sealing sleeve and a sealing head connected in sequence, a center rod and a piston are arranged in the piston outer tube, the upper end of the center rod is fixedly connected to the connector, the stop tube and the piston outer tube are connected by threads, so that the drilling fluid can push the piston to force the stop tube to move downward after entering the first annular cavity between the connector and the piston in the piston outer tube; the first annular cavity is connected to the inner cavity of the stop tube, the sealing sleeve is arranged on the center rod and is limited by the sealing head connected to the lower end of the center rod; the cone body is one and has a small outer diameter at the top and a large outer diameter at the bottom, and the lower end of the stop tube is fixedly connected to the connector. The tool has a well sealing function, a short operation cycle, can be fully recovered after the sidetracking is completed, and has a wide range of applications.

Description

Technical Field

[0001] The invention belongs to well repairing tools, and in particular relates to a recoverable integrated self-sealing well window opening sidetracking tool. Background Art

[0002] The window side drilling tool includes a bevel guide and a milling cone for window side drilling in a well. The bevel guide and milling cone of the traditional window side drilling tool are two sets of independent tools. In order to improve work efficiency, publication numbers CN102364029A and CN103195362 A both disclose an integrated window side drilling tool. The integrated window side drilling tool replaces the feeder installed on the traditional hydraulic bevel guide bevel iron with a milling cone that can perform window milling operations, that is, the bevel guide and the milling cone are combined together, and the bevel guide fixing and the milling cone window opening and window repair operations can be completed by only one drilling, which can greatly improve work efficiency and reduce construction costs and labor intensity.

[0003] However, during use, the above-mentioned integrated window side drilling tool has an upper and lower cone in the setting and anchoring device, with the small head of the upper cone facing upward and the small head of the lower cone facing downward. Therefore, when the upper cone is under pressure after setting, the slips evenly distributed on its outer edge are pressed tighter and tighter, ensuring that the setting and anchoring device cannot move downward; and when the lower cone is under tension, the slips evenly distributed on its outer edge are pulled tighter and tighter, ensuring that the setting and anchoring device cannot move upward; so once the integrated window side drilling tool is set, it cannot be taken out, that is, it cannot be recovered. Therefore, the side drilling tool can only be used for ordinary window side drilling wells, and cannot be used for drilling side drilling branch wells and fishbone wells. If the window side drilling tool cannot be recovered or fails to be recovered for side drilling branch wells and fishbone wells, the side drilling branch wells or fishbone wells cannot be completed, and even the original well may be scrapped.

[0004] With the deepening of the low-carbon and environmental protection concept, side-drilling branch wells and fishbone wells that can greatly increase the single well production are becoming more and more popular in oil fields. However, drilling side-drilling branch wells and fishbone wells requires that the guide of the window side-drilling tool can be recovered. Therefore, the existing integrated window side-drilling tool can no longer fully meet the market demand.

[0005] At the same time, since the above two window sidetracking tools do not have the function of sealing the well, leakage, well kick and even blowout are prone to occur during the sidetracking process, which not only wastes drilling fluid, but also sometimes makes the sidetracking unable to proceed normally; in order to prevent similar complex situations from happening, it is required to seal the well before sidetracking. At present, well sealing usually adopts cement plug or bridge plug, which not only increases the operation time, but also increases the cost of sidetracking.

[0006] In order to solve the problem of side drilling and well sealing, the utility model patent with the publication number CN207315276U discloses an automatic well sealing integrated window side drilling tool, including a hollow milling cone, a guide angle iron and a sealing anchor device connected coaxially in sequence, a liquid guide tube connecting the lower end of the milling cone and the inner cavity of the sealing anchor device is provided in the guide angle iron, a sealing body is connected to the lower end of the sealing anchor device, and a sealing ring made of an oil-water swelling material is provided on the sealing body, which is used to automatically swell when encountering oil and water after drilling to achieve the sealing of the old wellbore. This window side drilling tool is not only unrecoverable, but also takes a long time to take effect when the sealing ring automatically expands when encountering oil and water. It usually takes 3-6 days to fully expand to achieve the sealing effect, resulting in a long operation cycle and high cost. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a recyclable integrated self-sealing well window side drilling tool with a wide range of applications and a well sealing function, a short operation cycle, and the ability to achieve full recovery after side drilling completion.

[0008] The technical solution of the present invention is as follows:

[0009] A recyclable integrated self-sealing well window sidetracking tool comprises a hollow milling cone, a guide angle iron, a setting anchor device and a well sealing device connected in sequence, wherein the setting anchor device comprises a cylinder sleeve, a cone body, a limit tube and a slip arranged in the cylinder sleeve; the special features thereof are:

[0010] The well sealing device comprises a connector, a piston outer tube, a stop tube, a sealing sleeve and a sealing head which are sequentially connected to the lower end of the cylinder sleeve; a center rod and a piston sleeved outside the center rod are arranged in the piston outer tube; the upper end of the center rod is fixedly connected to the connector; the stop tube and the piston outer tube are connected by threads, so that drilling fluid can push the piston to force the stop tube to move downward after entering the first annular cavity between the connector and the piston in the piston outer tube; the first annular cavity is communicated with the inner cavity of the limiting tube; the sealing sleeve is sleeved on the center rod and limited by the sealing head connected to the lower end of the center rod;

[0011] The cone is a single body with an outer diameter that is smaller at the top and larger at the bottom. The lower end of the limit tube is fixedly connected to the connector, and the upper part of the limit tube is threadedly connected to the cone, so that the drilling fluid can push the cone upward after entering the second annular cavity below the cone in the cylinder sleeve. The slips are divided into a plurality of longitudinal slips and radial slips, which are alternately arranged and evenly connected to the upper part of the outer edge of the cone in a circumferential direction by shear screws, so as to extend from the outer wall of the cylinder sleeve under the push of the cone to realize the longitudinal and radial positioning of the deflector.

[0012] As a further preference, the anti-retreat tube is connected to the piston outer tube by a fine-pitch serrated thread, with the thread tips on the anti-retreat tube facing upwards and the thread tips inside the piston outer tube facing downwards, and strip holes are evenly distributed on the circumference of the upper outer edge of the anti-retreat tube, so that the anti-retreat tube has elasticity to maintain the well-sealing state after the anti-retreat tube moves downward.

[0013] As a further preference, a fluid channel is provided at the upper end of the center rod, the fluid channel is formed by a central blind hole and radial holes that are vertically connected to each other, and the first annular cavity is connected to the inner cavity of the limiting tube through the fluid channel.

[0014] As a further preference, a positioning shoulder is provided on the outer edge of the middle part of the center rod, and the piston is stuck on the positioning shoulder after moving down to the maximum stroke, so as to ensure that the sealing sleeve reaches the tightness that meets the sealing requirements, and at the same time transmits the drilling fluid pressure to the center rod to ensure that the pressure in the inner cavity of the sealing anchor device reaches the designed sealing pressure.

[0015] As a further preference, a positioning clamping edge is provided on the inner wall of the middle part of the piston outer tube, and the upper end of the piston is clamped at the positioning clamping edge.

[0016] As a further preference, the longitudinal slips and radial slips are two in number and symmetrically connected on both sides of the outer edge of the cone; an inner clamping edge is provided at the lower inner part of the cylinder sleeve, and the lower end of the cone is clamped at the inner clamping edge.

[0017] As a further preference, the upper part of the limit tube is connected to the conical body by a fine-pitch serrated thread, and the thread tips on the limit tube face upward, and the thread tips inside the conical body face downward, and a plurality of strip holes are evenly distributed on the outer wall of the limit tube along its axial direction, which are used to introduce drilling fluid into the second annular cavity and make the limit tube elastic, thereby ensuring that the conical body is limited after sealing.

[0018] As a further preference, a jet tube is further provided in the cylinder sleeve, and two ends of the jet tube are respectively plugged into the inclined iron and the conical body of the bevel guide.

[0019] As a further preference, a positioning key is radially provided on the milling cone, which protrudes from the inner wall of the milling cone and is aligned with the center line of the inclined surface of the bevel iron of the guide bevel; it is used to match the keyway on the logging instrument for determining the orientation of the inclined surface of the bevel iron of the guide bevel, so as to facilitate the positioning of the logging instrument.

[0020] As a further preference, the milling cone is pressed on the inclined surface of the inclined iron of the bevel guide, and the upper end of the inclined surface of the bevel iron of the bevel guide and the positioning key are respectively located on both sides of the axis of the milling cone; a liquid guide tube connecting the inner hole of the milling cone and the inner cavity of the sealing anchoring device is provided in the bevel iron of the bevel guide.

[0021] As a further preference, the bevel guide iron is clamped in the arc dovetail groove at the lower part of the milling cone through a positioning block, a fastening screw is provided between the positioning block and the milling cone, and a positioning screw is provided between the upper end of the bevel guide iron and the milling cone.

[0022] As a further preference, a milling cone head is connected to the lower end of the milling cone, a nozzle hole communicating with the inner hole of the milling cone is provided on the milling cone head, and the upper end of the liquid guide tube is inserted into the nozzle hole.

[0023] As a further preference, an auxiliary water hole is radially provided on the milling cone corresponding to the positioning screw, and a blind hole connected to the auxiliary water hole is provided on the positioning screw. When the bevel iron of the guide bevel device is not disengaged from the milling cone, the positioning screw blocks the auxiliary water hole. When the bevel iron of the guide bevel device is disengaged from the milling cone, that is, after the positioning screw is sheared off, the inner hole of the milling cone is connected to the outside through the auxiliary water hole and the blind hole of the positioning screw.

[0024] The beneficial effects of the present invention are:

[0025] 1. Since the well sealing device comprises a connector, a piston outer tube, a stop tube, a sealing sleeve and a sealing head which are sequentially connected to the lower end of the cylinder sleeve, a center rod and a piston sleeved outside the center rod are arranged in the piston outer tube, when the pressure is pressed and the seal is set, the drilling fluid enters the first annular cavity between the connector and the piston in the piston outer tube and can push the piston to force the stop tube to move downward, thereby compressing the sealing sleeve to deform and expand outward, thereby blocking the annular space between the well sealing device and the side drilling casing, thereby realizing self-sealing of the well; therefore, leakage, well gust and even blowout can be avoided during the side drilling process, drilling fluid can be saved and normal side drilling can be ensured.

[0026] 2. The well sealing device arranged at the lower end of the sealing anchor device can seal the window side drilling tool, so that the fluid in the well cannot enter the window side drilling tool and the inner cavity of the drill bit. Therefore, the drill pipe will not spray any liquid during the drilling process, and there is no pressure excitement, which is particularly beneficial to clean production and environmental protection. The window side drilling tool can be used for side drilling without sealing the well first, eliminating the operation of cement plug or bridge plug, eliminating the risk of well leakage, well gust and even blowout, saving operation time and workload, saving materials such as bridge plugs, and improving the efficiency and benefits of side drilling.

[0027] 3. Since there is only one cone in the cylinder sleeve of the setting and anchoring device, and longitudinal slips and radial slips are evenly connected to the upper outer edge of the cone in the circumferential direction, it not only saves a cone and a group of slips compared with the traditional integrated window side drilling tool, simplifies the structure and reduces the manufacturing cost; and the longitudinal slips and radial slips are extended from the outer wall of the cylinder sleeve and stuck on the well wall under the push of the cone, so that the longitudinal and radial positioning of the setting and anchoring device can be achieved, so that the inclined iron of the guide can neither rotate nor move up and down, and the setting is reliable. It can be applied to the window side drilling operations of various wells and has a wide range of applications; the fixing of the inclined iron of the guide, the milling cone window opening and the window repairing operations can be completed by only one tripping and drilling, which can greatly improve the work efficiency.

[0028] 4. Since there is only one cone in the cylinder sleeve of the setting and anchoring device, and the outer diameter is smaller at the top and larger at the bottom, when the window side drilling is completed, the inclined iron of the guide can be lifted up by the salvage tool, and the longitudinal slips and radial slips can be driven upward through the cylinder sleeve. At the same time, the limit tube is forced to jump upward in the cone body through the connecting head, so that the longitudinal slips and radial slips stuck on the well wall can be loosened and unstuck; at the same time, the sealing sleeve is driven upward synchronously by the center rod and the head, so that the guide can be completely lifted out, and all recovery can be achieved after the side drilling operation is completed. After recovery, only the sealing sleeve needs to be replaced for reuse, and the use cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the present invention.

[0030] Figure 2 yes Figure 1 AA section view.

[0031] In the figure: milling cone 1, positioning key 2, positioning screw 3, positioning block 4, fastening screw 5, milling cone head 6, liquid guide tube 7, bevel guide iron 8, jet tube 9, cylinder sleeve 10, longitudinal slip 11, shear screw 12, cone body 13, limit tube 14, strip hole 141, connector 15, piston outer tube 16, piston 17, center rod 18, fluid channel 181, positioning shoulder 182, stop tube 19, strip hole 191, sealing sleeve 20, head 21, first annular cavity 22, second annular cavity 23, radial slip 24. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1-2As shown, the present invention relates to a recyclable integrated self-sealing well window side drilling tool, comprising a hollow milling cone 1, a bevel guide iron 8, a sealing anchoring device and a well sealing device connected in sequence, a positioning key 2 is radially provided on the milling cone 1, the positioning key 2 protrudes from the inner wall of the milling cone 1 and is aligned with the center line of the bevel surface of the bevel guide iron 8; the positioning key 2 matches the keyway on the logging instrument for determining the bevel surface orientation of the bevel guide iron 8, so as to facilitate the positioning of the logging instrument.

[0034] The milling cone 1 is pressed on the upper part of the inclined surface of the inclined iron 8 of the bevel guide, and the upper end of the inclined surface of the inclined iron 8 of the bevel guide and the positioning key 2 are respectively located on both sides of the axis of the milling cone 1; a liquid guide tube 7 is provided in the inclined iron 8 of the bevel guide, which connects the inner hole of the milling cone 1 and the inner cavity of the setting anchor device. A positioning block 4 is radially inserted and welded on the upper part of the inclined iron 8 of the bevel guide, and the inclined iron 8 of the bevel guide is clamped in the arc dovetail groove provided at the lower part of the milling cone 1 through the positioning block 4. A fastening screw 5 is connected between the positioning block 4 and the milling cone 1 along the radial direction of the milling cone 1, and a positioning screw 3 is connected between the upper end of the inclined iron 8 of the bevel guide and the milling cone 1 along the radial direction of the milling cone 1.

[0035] An auxiliary water hole is radially provided on the milling cone 1 corresponding to the positioning screw 3, and a blind hole connected with the auxiliary water hole is provided on the positioning screw 3. When the bevel iron 8 of the guide bevel device is not detached from the milling cone 1, the positioning screw 3 blocks the auxiliary water hole. When the bevel iron 8 of the guide bevel device is detached from the milling cone 1, that is, after the positioning screw 3 is sheared off, the inner hole of the milling cone 1 is connected to the outside through the auxiliary water hole and the blind hole of the positioning screw 3.

[0036] A milling cone head 6 is connected to the lower end of the milling cone 1 through a thread, and a nozzle hole connected to the inner hole of the milling cone is provided on the milling cone head 6. The upper end of the liquid guide tube 7 passes through the upper part of the inclined surface of the inclined iron 8 of the guide bevel device and is inserted into the nozzle hole.

[0037] The setting anchor device comprises a cylinder sleeve 10 fixedly connected to the outer edge of the lower end of the inclined iron 8 of the guide bend device by threads, and a jet tube 9, a hollow cone 13, a limit tube 14 and a slip are arranged in the cylinder sleeve 10, and the upper end of the jet tube 9 is inserted and fixed in the central hole of the lower end of the inclined iron 8 of the guide bend device, and is plugged with the lower end of the liquid guide tube 7; the lower end of the jet tube 9 is plugged with the central hole of the cone 13 in a clearance fit, and O-type sealing rings are respectively arranged between the jet tube 9 and the cone 13 and between the lower end of the cone 13 and the cylinder sleeve 10;

[0038] The conical body 13 is a single body with a smaller outer diameter at the top and a larger outer diameter at the bottom. An inner clamping edge is provided at the lower inner part of the cylinder sleeve 10. The conical body 13 is installed in the cylinder sleeve 10 by sliding fit and the lower end is clamped at the inner clamping edge. The upper part of the limiting tube 14 is movably connected with the inner hole of the conical body 13 by a fine-tooth serrated thread, and the serrated thread tips on the limiting tube 14 face upward, while the thread tips in the conical body face downward, so that the drilling fluid can push the conical body 13 to slide upward on the limiting tube 14 after entering the second annular cavity below the conical body 13 in the cylinder sleeve. A plurality of strip holes 141 are evenly distributed on the outer wall of the limiting tube 14 and are arranged along the axial direction thereof, which are used to introduce the drilling fluid into the second annular cavity 23 and make the limiting tube 14 elastic, so as to ensure that the conical body 13 is limited after setting.

[0039] The slips are divided into a plurality of longitudinal slips 11 and radial slips 24, the inner walls of the longitudinal slips 11 and radial slips 24 are arc-shaped conical surfaces and cooperate with the outer edge conical surfaces of the cone 13, the longitudinal slips 11 and radial slips 24 are alternately arranged and are evenly connected to the upper part of the outer edge of the cone 13 in the circumferential direction by shear screws 12, and are used to extend from the outer wall of the cylinder sleeve and get stuck on the well wall under the push of the cone 13 to achieve the longitudinal and radial positioning of the deflector. In this embodiment, the longitudinal slips 11 and radial slips 24 are two and symmetrically connected to the front and back and left and right sides of the outer edge of the cone 13, and rectangular openings are respectively provided on the outer wall of the cylinder sleeve 10 corresponding to each slip, and the radial slips 24 and the longitudinal slips 11 are respectively inserted into the corresponding rectangular openings, so that the radial slips 24 and the longitudinal slips 11 can extend from the outer wall of the cylinder sleeve 10 under the upward extrusion of the cone 13.

[0040] The well sealing device comprises a hollow connector 15, a piston outer tube 16, a stop tube 19, a sealing sleeve 20 and a sealing head 21 which are coaxially connected to the lower end of the cylinder sleeve in sequence. The cylinder sleeve 10 and the lower end of the limit tube are respectively fixedly connected to the outer edge and the inner hole of the connector 15 by threads. A center rod 18 and a piston 17 sleeved on the outside of the center rod 18 are provided in the piston outer tube 16. The piston 17 is matched with the upper part of the center rod 18 and the inner cavity of the piston outer tube 16 by sliding clearances. Sealing rings are respectively provided between the upper end of the outer edge of the piston 17 and the piston outer tube 16 and between the lower end of the inner hole of the piston 17 and the center rod 18 to improve the sealing performance of the first annular cavity. The upper end of the piston outer tube 16 and the outer edge of the lower end of the connector 15 are connected to the outer edge of the piston outer tube 16. Through threaded connection and welding, the upper end of the center rod 18 is fixedly connected to the inner hole of the connector 15 through threads, the outer edge of the anti-retraction tube 19 is stepped and the upper part is connected to the piston outer tube 16 through fine-tooth serrated threads, and the thread tips on the anti-retraction tube 19 face upward, and the thread tips in the piston outer tube 16 face downward, so that the drilling fluid can enter the first annular cavity 22 between the connector 15 and the piston 17 in the piston outer tube 16 and push the piston 17 to force the anti-retraction tube 19 and the piston outer tube 16 to slip and move downward; the first annular cavity 22 is connected to the inner cavity of the limiting tube, and the sealing sleeve 20 is a rubber sleeve, which is sleeved on the center rod 18 and is limited by the head 21 connected by threads and welded to the lower end of the center rod 18;

[0041] Strip holes 191 are evenly distributed on the circumference of the upper outer edge of the anti-retreat tube 19, so that the anti-retreat tube 19 has elasticity, so that the anti-retreat tube 19 can maintain the sealing state after moving down. A fluid channel 181 is provided at the upper end of the center rod 18, and the fluid channel 181 is formed by connecting a central blind hole and a radial hole that are arranged at the upper end of the center rod 18 and vertically penetrate each other. The first annular cavity 22 is connected with the inner cavity of the limit tube through the fluid channel 181. A positioning clamp edge is provided on the inner wall of the middle part of the piston outer tube 16, and the upper end of the piston 17 is clamped at the positioning clamp edge. A positioning shoulder 182 is provided on the outer edge of the middle part of the center rod 18, and the piston 17 is clamped on the positioning shoulder 182 after moving down to the maximum stroke, which is used to ensure that the sealing sleeve 20 reaches the tightness that meets the sealing requirements, and at the same time transmits the drilling fluid pressure to the center rod 18 to ensure that the pressure in the inner cavity of the sealing anchor device reaches the designed sealing pressure.

[0042] When working, the specific steps are as follows:

[0043] 1. Connect the window sidetracking tool to the drilling tool through the milling cone 1 and lower it to the predetermined position in the well. For the sidetracking well that needs to be oriented, directly lower the well logging instrument. The key slot of the well logging instrument guide is seated on the positioning key 2 to start the directional operation. After the inclined iron 8 of the guide is placed in the azimuth, take out the well logging instrument, connect the square drill rod or top drive through the drilling tool, and start the pump for pressure.

[0044] 2. After the pump is turned on to pressurize, the high-pressure drilling fluid enters the inner holes of the milling cone 1, the liquid guide tube 7, the jet tube 9, the limit tube 14, and the connector 15 through the inner hole of the drill bit in turn, and starts to hold pressure in the central blind hole at the upper end of the center rod 18, so that the drill bit is filled with high-pressure drilling fluid; when setting the seal, the drilling fluid enters the second annular cavity through the strip hole, pushing the cone 13 and the limit tube 14 to "slip" and move upward; at the same time, the drilling fluid enters the first annular cavity 22 through the fluid channel 181, pushing the piston 17 to force the stop tube 19 and the piston outer tube 16 to slip and move downward, thereby compressing the sealing sleeve 20 to deform and expand outward. When the piston 17 moves down to the maximum stroke, it is stuck on the positioning shaft shoulder. At this time, the sealing sleeve 20 reaches the designed tension, and the annular space between the sealing device and the side drilling casing is blocked, thereby realizing self-sealing of the well;

[0045] 3. After sealing the well, the drilling fluid pressure entering the second annular cavity 23 continues to increase. When it finally reaches the designed sealing pressure of 22 MPa or above, the cone 13 is pushed to cut the shear screw 12, and the radial slips 24 and the longitudinal slips 10 are squeezed out of the cylinder sleeve and stuck on the well wall to achieve sealing; when the pump pressure reaches the predetermined value, the pump is stopped and the pressure is stabilized for 30 seconds.

[0046] 4. After the pressure is released, the drill bit is rotated forward. At this time, since the thread tips on the stop tube 19 face upward and the thread tips in the cone body face downward, the stop tube 19 and the cone body 13 will not retreat after moving, thereby maintaining the well sealing and setting state. When the drill bit rotates, it drives the milling cone 1 to rotate and cut off the fastening screw 5 and the positioning screw 3, thereby opening the auxiliary water hole, and at the same time, the arc dovetail groove is separated from the positioning block 4; continue to rotate the drill bit, the liquid guide tube 14 is twisted off at the outlet of the nozzle hole of the milling cone 1, so that the nozzle hole naturally forms the nozzle of the milling cone 1. At this time, the inclined iron 8 of the guide bevel device and the milling cone 1 are completely disengaged, and the pump can be restarted to circulate the drilling fluid, and the drill bit is rotated and drilling pressure is applied to perform window side drilling.

[0047] During the window opening process, once the nozzle hole at the front end of the milling cone 1 is blocked by the formation or cement, a portion of the drilling fluid will be released through the auxiliary water hole, thereby avoiding pump blocking. After the window opening is completed, the milling cone 1 is pulled out of the drill, and then the drill bit can be lowered to carry out the subsequent sidetracking operations. Since the inclined iron of the guide is only subjected to pressure and torque during the entire process of window opening and sidetracking, the radial slips and longitudinal slips can be stuck on the well wall to ensure that the circumferential direction and longitudinal position of the guide are fixed, which can ensure the smooth completion of sidetracking.

[0048] 5. After the window side drilling is completed, the remaining part of the window side drilling tool can be recovered by salvaging using a salvage tool. That is, the female cone is used to make a buckle on the upper part of the inclined iron 8 of the guide bevel device and then lifted up, and the inclined iron 8 of the guide bevel device pulls the cylinder sleeve 10 upward, and the cylinder sleeve 10 forcibly pushes the limit tube 18 in the cone 17 through the connector 15 to "jump buckle" and move upward. At the same time, the cylinder sleeve 10 drives the longitudinal slip 11 and the radial slip 24 upward. Since the small head of the cone 13 is on the top, that is, the longitudinal slip 11 and the radial slip 24 slide above the small head of the cone 13, so that the longitudinal slip 11 and the radial slip 24 stuck on the well wall are gradually loosened and unstuck. After unstuck, the sealing sleeve is driven upward synchronously through the center rod and the sealing head, and the inclined iron 8 of the guide bevel device together with the anchoring device and the sealing device can be fully lifted out, so that the window side drilling tool is fully recovered. After recovery, it can be reused by simply replacing the sealing sleeve.

[0049] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A recyclable integrated self-sealing well window sidetracking tool, comprising a hollow milling cone, a guide angle iron, a setting anchor device and a well sealing device connected in sequence, wherein the setting anchor device comprises a cylinder sleeve, a cone body, a stop tube and a slip arranged in the cylinder sleeve; wherein: The well sealing device comprises a connector, a piston outer tube, a stop tube, a sealing sleeve and a sealing head which are sequentially connected to the lower end of the cylinder sleeve; a center rod and a piston sleeved outside the center rod are arranged in the piston outer tube; the upper end of the center rod is fixedly connected to the connector; a fluid channel is arranged at the upper end of the center rod; the stop tube and the piston outer tube are connected by threads, so that the drilling fluid can push the piston to force the stop tube to move downward after entering the first annular cavity between the connector and the piston in the piston outer tube; the first annular cavity is connected to the inner cavity of the limiting tube through the fluid channel; the sealing sleeve is sleeved on the center rod and limited by the sealing head connected to the lower end of the center rod; The conical body is one and has an outer diameter that is smaller at the top and larger at the bottom. The lower end of the limiting tube is fixedly connected to the connector, and the upper part of the limiting tube is connected to the conical body by a thread. A plurality of strip holes arranged along the axial direction are evenly distributed on the outer wall of the limiting tube, which are used to introduce drilling fluid into the second annular cavity and make the limiting tube elastic, so as to ensure that the conical body is limited after setting, so that the drilling fluid can push the conical body upward after entering the second annular cavity below the conical body in the cylinder sleeve; the slips are divided into a plurality of longitudinal slips and radial slips, which are alternately arranged and evenly connected to the upper part of the outer edge of the conical body by shear screws in the circumferential direction, respectively, for extending from the outer wall of the cylinder sleeve under the push of the conical body to realize the longitudinal and radial positioning of the deflector; When setting the seal, the drilling fluid enters the second annular cavity through the strip hole, pushing the cone upward; at the same time, the drilling fluid enters the first annular cavity through the fluid channel, pushing the piston to force the stop tube to move downward, thereby compressing the sealing sleeve to deform and expand outward, blocking the annular space between the sealing device and the side drilling casing, thereby achieving self-sealing of the well; After sealing the well, the drilling fluid pressure entering the second annulus continues to increase, and finally reaches the designed sealing pressure, pushing the cone to cut the shear screw, and squeeze the radial slips and longitudinal slips out of the cylinder sleeve and stick them to the well wall to achieve sealing.

2. The recyclable integrated self-sealing well window sidetracking tool according to claim 1 is characterized by: The anti-retreat tube is connected to the piston outer tube by a fine-pitch serrated thread, with the thread tips on the anti-retreat tube facing upwards and the thread tips inside the piston outer tube facing downwards. Strip holes are evenly distributed on the circumference of the upper outer edge of the anti-retreat tube, so that the anti-retreat tube has elasticity, so as to maintain the well sealing state after the anti-retreat tube moves downwards.

3. The recyclable integrated self-sealing well window sidetracking tool according to claim 1 is characterized by: The fluid channel is formed by connecting a central blind hole and radial holes that penetrate each other vertically.

4. The recyclable integrated self-sealing well window sidetracking tool according to claim 1 or 3, characterized in that: A positioning shoulder is provided on the outer edge of the middle part of the center rod. The piston is clamped on the positioning shoulder after moving down to the maximum stroke, which is used to ensure that the sealing sleeve reaches the tightness that meets the sealing well requirements and transmits the drilling fluid pressure to the center rod.

5. The recyclable integrated self-sealing well window sidetracking tool according to claim 4 is characterized by: A positioning clamping edge is arranged on the inner wall of the middle part of the piston outer tube, and the upper end of the piston is clamped at the positioning clamping edge.

6. The recyclable integrated self-sealing well window sidetracking tool according to claim 1 is characterized by: There are two longitudinal slips and two radial slips respectively and they are symmetrically connected at two sides of the outer edge of the cone. An inner clamping edge is arranged at the lower inner part of the cylinder sleeve, and the lower end of the cone is clamped at the inner clamping edge.

7. The recyclable integrated self-sealing well window sidetracking tool according to claim 1 or 6, characterized in that: The upper part of the limiting tube is connected to the conical body through a fine-tooth sawtooth thread, and the thread tips on the limiting tube face upwards, while the thread tips in the conical body face downwards.

8. The recyclable integrated self-sealing well window sidetracking tool according to claim 1 or 6, characterized in that: A jet tube is also arranged in the cylinder sleeve, and two ends of the jet tube are respectively plugged with the inclined iron and the cone of the guide.

9. The recyclable integrated self-sealing well window sidetracking tool according to claim 1 is characterized in that: A positioning key is radially arranged on the milling cone, which protrudes from the inner wall of the milling cone and is aligned with the center line of the inclined surface of the inclined iron of the guide bevel device; and is used to match the keyway on the logging instrument for determining the orientation of the inclined surface of the inclined iron of the guide bevel device.

10. The retrievable integrated self-sealing well window sidetracking tool according to claim 9 is characterized by: The milling cone is pressed on the inclined surface of the inclined iron of the bevel guide, and the upper end of the inclined surface of the bevel iron of the bevel guide and the positioning key are respectively located on both sides of the axis of the milling cone; a liquid guide tube connecting the inner hole of the milling cone and the inner cavity of the setting anchor device is provided in the inclined iron of the bevel guide.

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