Self-sealing well type recyclable hydraulic deflector

Abstract

A self-sealing well type recoverable hydraulic deflector includes a hollow joint, a feeder, a deflector bevel iron, a setting anchor device and a well sealing device. The setting anchor device includes a cylinder sleeve, a cone, a stop tube and a slip. The well sealing device includes a connector, a piston outer tube, a stop tube, a sealing sleeve and a seal 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 is connected to the piston outer tube, 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 outer diameter of the cone is small at the top and large at the bottom. The upper part of the stop tube is connected to the cone by a thread, 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. The deflector has a well sealing function and can achieve full recovery after side drilling and well completion. It has a wide range of applications.

Description

Technical Field

[0001] The invention belongs to well repairing tools, and in particular relates to a self-sealing well type recoverable hydraulic deflector. Background Art

[0002] The deflector is a tool used for window side drilling in a well. The existing deflector mainly includes hydraulic deflector and mechanical fixed deflector. The former, such as the Chinese invention patent with publication number CN110748314A, discloses a wireless self-directional hydraulic deflector, including a hollow joint, a feeder, a deflector bevel iron and a sealing anchor device connected in sequence, wherein the sealing anchor device includes a cylinder sleeve, an upper and lower cone body arranged in the cylinder sleeve, and a limit tube connecting the upper and lower cone bodies; a sealing edge is provided at the lower end of the inner hole of the lower cone; a valve core and a pressure spring are provided between the limit tube and the sealing edge in the lower cone, and the upper end of the valve core is matched with the inner hole of the lower cone; a flow gap is formed between the lower end of the valve core and the sealing edge; when the drilling fluid displacement reaches or exceeds a predetermined value, the pressure spring is compressed, and the valve core is pressed on the sealing edge to close the flow gap, so as to realize the pressure holding sealing. The deflector can not only circulate drilling fluid for directional operation using a logging instrument, but also achieve pressure-holding and sealing after directional operation is completed, and works reliably; the directional operation time and well construction cycle are shortened.

[0003] However, during use, the hydraulic deflector 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 deflector is under pressure after setting, the upper cone and the slips evenly distributed on its outer edge are pressed tighter and tighter, ensuring that the deflector cannot move downward; and when the deflector is pulled, the slips evenly distributed on the lower cone and its outer edge are pulled tighter and tighter, ensuring that the deflector cannot move upward; so once the deflector is set, it cannot be taken out, that is, it cannot be recovered. Therefore, the deflector 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 deflector 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] The latter mechanical fixed deflector, such as the Chinese invention patent with publication number CN102041967A, discloses a recyclable track deflector, which includes a deflector and a deflector bevel iron, a track tube is fixedly connected to the lower end of the deflector bevel iron, a conical sleeve is provided on the upper part of the track tube, track grooves are evenly distributed on the track tube, the track grooves are divided into long grooves and short grooves and are arranged alternately, and reversing grooves connecting the long grooves and the short grooves are evenly distributed on the track tube below the track grooves, a sliding sleeve is mounted on the track tube, a guide ring is flexibly connected under the sliding sleeve, and guide positioning pins are evenly distributed on the guide ring and inserted into the short grooves respectively, bow spring sheets and strip spring sheets are evenly installed in the middle and upper end of the sliding sleeve along the circumferential direction, and slips are respectively fixed to the upper ends of the strip spring sheets.

[0005] Since the above two types of deflectors 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 such complex situations from happening, it is required to seal the well first and then sidetrack. At present, the well is usually sealed by 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, a utility model patent with publication number CN2284856Y discloses a side drilling tool with well sealing function, which includes a feeder, a deflector, a sealing anchor device and a well sealing device. Since the well sealing device needs the feeder to push the force transmission rod and the flange to compress the seal to achieve well sealing, that is, mechanical pressurization is used to seal the well, not only is the structure complex, but the well sealing thrust is not easy to control and the well sealing effect is general; and since there is an axial center hole for inserting the feeder in the deflector bevel iron, the center hole forms a large groove in the upper middle part of the bevel iron bevel surface of the deflector, which not only makes the bevel surface of the deflector uneven in hardness, but also causes tooth hitting due to the intermittent contact between the milling cone teeth and the bevel surface of the deflector when opening a window at this position, and also causes the bevel iron of the deflector to be damaged, affecting the side drilling effect of window opening, so it has faded out of the side drilling market.

[0007] The utility model patent with the publication number CN207315276U discloses an automatic well-sealing integrated window-cutting side-drilling tool, which includes a hollow milling cone, a guide angle iron and a sealing anchor device connected coaxially in sequence. A liquid guide tube is provided in the guide angle iron to connect the lower end of the milling cone and the inner cavity of the sealing anchor device. A packer is connected to the lower end of the sealing anchor device. A packer ring made of an oil- and water-swelling material is provided on the packer body, which is used to automatically expand when encountering oil and water after drilling to seal the old wellbore. Although this window-cutting side-drilling tool can achieve self-sealing of the well, the automatic expansion of the packer ring when encountering oil and water takes a long time to take effect. It usually takes 3-6 days to fully expand to achieve the sealing effect, resulting in a long operation cycle and high cost. It is also not recyclable and has a small scope of application. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a self-sealing well type recoverable hydraulic deflector with a well sealing function, which can realize full recovery after side drilling and well completion and has a wide range of applications.

[0009] The technical solution of the present invention is as follows:

[0010] A self-sealing well type recoverable hydraulic deflector, comprising a hollow joint, a feeder, a deflector inclined iron, a sealing anchor device and a well sealing device connected in sequence, wherein the sealing anchor device comprises a cylinder sleeve, a conical body, a limit tube and a slip arranged in the cylinder sleeve; the special feature is that the well sealing device comprises a connector, a piston outer tube, a stop tube, a sealing sleeve and a sealing head connected in sequence 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 is connected to the piston outer tube by a thread, so that the drilling fluid can enter the first annular cavity between the connector and the piston in the piston outer tube and push the piston to force the stop tube to move downward; the first annular cavity is communicated with the inner cavity of the limit tube, the sealing sleeve is sleeved on the center rod and is 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 being formed by connecting a central blind hole and radial holes that penetrate each other vertically, 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 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 sealed and plugged with the inclined iron of the bevel guide and the conical body.

[0019] As a further preference, a positioning key is radially provided on the joint, which protrudes from the inner wall of the joint 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 feeder is pressed on the inclined surface of the inclined iron of the guide bevel, and the upper end of the inclined surface of the inclined iron of the guide bevel and the positioning key are respectively located on both sides of the axis of the coaxially arranged joint and the feeder; a liquid guide tube connecting the feeder and the inner cavity of the setting anchor device is provided in the inclined iron of the guide bevel.

[0021] As a further preference, a hook body is fixedly connected to the lower end of the delivery device, an elbow body is inserted into the hook body, an arc-shaped groove is provided on the inclined surface of the inclined iron of the guide bevel device corresponding to the hook body, and an integrated arc-shaped hook is provided on the hook body and is stuck in the arc-shaped groove, so that the delivery device can be separated from the inclined iron of the guide bevel device by rotating the drill bit positively after sealing.

[0022] As a further preference, the upper end of the elbow body passes through the center hole of the hook body and is inserted into the center hole of the feeder. An annular groove is provided on the upper outer edge of the elbow body. A split clamping ring is provided in the annular groove between the hook body and the feeder to clamp the elbow body.

[0023] As a further preference, an elbow seat is fixed at the bevel iron of the bevel guide corresponding to the elbow body, the elbow seat coincides with the outer edge of the bevel iron of the bevel guide, the arc-shaped slot is arranged on the elbow seat, the front end of the elbow body is inserted into the elbow seat and connected with the liquid guide tube through the liquid guide hole arranged on the elbow seat, and a limit screw connected to the arc-shaped hook is arranged on the elbow seat along its radial direction to facilitate assembly and precise orientation.

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

[0025] 1. The well sealing device arranged at the lower end of the setting and anchoring device can seal the deflector, so that the fluid in the well cannot enter the deflector 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 use of the deflector to open a window for side drilling does not require sealing the well first, eliminating the operation of cement plugging or bridge plugging, eliminating the risk of well leakage, well kick and even blowout, saving operation time and workload, saving materials such as bridge plugs, and improving side drilling efficiency and benefits.

[0026] 2. 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 well is pressurized and sealed, the drilling fluid enters the first annular cavity between the connector and the piston in the piston outer tube, which can push the piston to force the stop tube to move downward, and can compress 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 kick and even blowout can be avoided during the side drilling process, drilling fluid can be saved, and normal side drilling can be ensured;

[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 along the circumferential direction, it not only saves a cone and a group of slips compared with the traditional hydraulic deflector, 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 under the push of the cone, so that the longitudinal and radial positioning of the deflector can be achieved, so that the deflector can neither rotate nor move up and down, the setting is reliable, and it can be applied to window side drilling operations in various wells, with a wide range of applications.

[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 schematic diagram of the structure of the present invention.

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

[0031] Figure 3 yes Figure 1 BB cross-sectional view.

[0032] In the figure: joint 1, positioning key 2, feeder 3, support sleeve 4, fastening screw 5, bevel guide iron 6, split clamp 7, elbow body 8, hook body 9, limit screw 10, elbow seat 11, liquid guide tube 12, jet tube 13, cylinder sleeve 14, longitudinal slip 15, shear screw 16, cone 17, limit tube 18, connector 19, piston outer tube 20, piston 21, center rod 22, fluid channel 221, positioning shoulder 222, stop tube 23, strip hole 231, sealing sleeve 24, head 25, first annular cavity 26, second annular cavity 27, radial slip 28. DETAILED DESCRIPTION

[0033] 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.

[0034] like Figure 1 to Figure 3 As shown, the present invention relates to a self-sealing well type recoverable hydraulic deflector, comprising a hollow joint 1, a feeder 3, a deflector bevel iron 6, a sealing anchor device and a well sealing device connected in sequence, the joint 1 and the feeder 3 are arranged on the same axis and are connected by threads, a liquid guide tube 12 connecting the inner hole of the feeder 3 and the inner cavity of the sealing anchor device is provided in the deflector bevel iron 6, a positioning key 2 is radially inserted and welded in the middle of the joint 1, the positioning key 2 protrudes from the inner wall of the joint 1 and is aligned with the center line of the inclined surface of the deflector bevel iron 6; the positioning key 2 matches the keyway on the well logging instrument guide for determining the inclined surface orientation of the deflector bevel iron 6, so as to facilitate the positioning of the well logging instrument.

[0035] The feeder 3 is pressed on the inclined surface of the inclined iron 6 of the deflector, and the upper end of the inclined surface of the inclined iron 6 of the deflector and the positioning key 2 are respectively located on both sides of the axis of the joint 1 and the feeder 3.

[0036] A hook body 9 is connected to the lower end of the feeder 3 by a thread, and an elbow body 8 is inserted in the hook body 9. The upper end of the elbow body 8 passes through the center hole of the hook body 9 and is sealed and inserted into the center hole of the feeder 3. An annular groove is provided on the upper part of the outer edge of the elbow body 8. A split clamping ring 7 is sleeved in the annular groove between the hook body 9 and the feeder 3 to clamp the elbow body 8; a sealing ring is provided between the upper end of the elbow body 8 and the feeder 3.

[0037] An elbow seat 11 is embedded and welded at the elbow body 8 corresponding to the bend iron 6 of the guide bend device. The elbow seat 11 coincides with the outer edge and the inclined surface of the bend iron 6 of the guide bend device. An arc-shaped slot with one end closed is processed at the hook body 9 corresponding to the elbow seat 11. An integrated arc-shaped hook is provided on the hook body 9 and the arc-shaped hook is stuck in the arc-shaped slot after rotation, so that the feeder 3 can be separated from the bend iron 6 of the guide bend device by rotating the drill tool after setting. The front end of the elbow body 8 is inserted into the liquid guide hole provided on the elbow seat 11 through a clearance fit seal and is connected to the liquid guide tube 12 through the liquid guide hole. Two sealing rings are provided between the lower end of the elbow body 8 and the liquid guide hole. A limit screw 10 connected to the arc-shaped hook is provided along its radial direction at the corresponding arc-shaped hook on the elbow seat 11 to facilitate assembly and precise orientation.

[0038] A support sleeve 4 is fixed on the outer edge of the middle part of the feeder 3, and a fastening screw 5 is inserted radially into the corresponding support sleeve 4 on the inclined iron 6 of the guide bevel device, and the front end of the fastening screw 5 is connected to the support sleeve 4 for fixing the support sleeve 4 and supporting the feeder 3 through the support sleeve.

[0039] The setting anchor device comprises a cylinder sleeve 14 fixedly connected to the outer edge of the lower end of the inclined iron 6 of the deflector, and a jet tube 13, a hollow cone 17, a limit tube 18 and a slip are arranged in the cylinder sleeve 14. The upper end of the jet tube 13 is inserted and fixed in the central hole of the lower end of the inclined iron 6 of the deflector, and is plugged with the lower end of the liquid guide tube 12; the lower end of the jet tube 13 is plugged with the central hole of the cone 17 in a clearance fit, and O-rings are respectively arranged between the jet tube 13 and the cone 17 and between the lower end of the cone 17 and the cylinder sleeve 14;

[0040] The conical body 17 is a single body with a smaller outer diameter at the top and a larger outer diameter at the bottom, and is installed in the cylinder sleeve 14 by sliding fit. An inner clamping edge is provided at the lower inner part of the cylinder sleeve 14, and the conical body 17 is clamped at the inner clamping edge; the upper part of the limiting tube 18 is connected to the conical body 17 by a fine-tooth serrated thread, and the serrated thread tips on the limiting tube 18 face upward, and the thread tips inside the conical body face downward, so that the drilling fluid can push the conical body 17 to slide upward on the limiting tube 18 after entering the second annular cavity 27 below the conical body 17 in the cylinder sleeve; a plurality of strip holes 181 are evenly distributed on the outer wall of the limiting tube 18, which are arranged along the axial direction thereof, for introducing the drilling fluid into the second annular cavity 27 and making the limiting tube elastic, so as to ensure that the conical body is limited after setting;

[0041] The slips are divided into a plurality of longitudinal slips 15 and radial slips 28, the inner walls of the longitudinal slips 15 and radial slips 28 are arc-shaped conical surfaces and cooperate with the outer edge conical surfaces of the cone 17, the longitudinal slips 15 and radial slips 28 are alternately arranged and are evenly connected to the upper part of the outer edge of the cone 17 in the circumferential direction by shear screws 16, respectively, and are used to extend from the outer wall of the cylinder sleeve under the push of the cone 17 to achieve the longitudinal and radial positioning of the deflector. In this embodiment, the longitudinal slips 15 and radial slips 28 are respectively two and symmetrically connected to the front and rear and left and right sides of the outer edge of the cone 17, and rectangular openings are respectively provided on the outer wall of the cylinder sleeve 14 corresponding to each slip, and the radial slips 28 and the longitudinal slips 15 are respectively embedded in the corresponding rectangular openings, so that the radial slips 28 and the longitudinal slips 15 can extend from the outer wall of the cylinder sleeve 14 under the upward extrusion of the cone 17.

[0042] The well sealing device comprises a hollow connector 19, a piston outer tube 20, a stop tube 23, a sealing sleeve 24 and a sealing head 25 which are coaxially connected to the lower end of the cylinder sleeve in sequence. The cylinder sleeve 14 and the lower end of the limit tube are respectively fixedly connected to the outer edge and inner hole of the connector 19 by threads. A center rod 22 and a piston 21 sleeved on the outside of the center rod 22 are provided in the piston outer tube 20. The piston 21 is matched with the upper part of the center rod 22 and the inner cavity of the piston outer tube 20 by sliding clearance. Sealing rings are respectively provided between the upper end of the outer edge of the piston 21 and the piston outer tube 20 and between the lower end of the inner hole of the piston 21 and the center rod 22 to improve the sealing performance of the first annular cavity. The upper end of the piston outer tube 20 and the connector 19 are fixedly connected to the outer edge and inner hole of the piston 20 by threads. A center rod 22 and a piston 21 sleeved on the outside of the center rod 22 are provided in the piston outer tube 20. The piston 21 and the upper part of the center rod 22 and the inner cavity of the piston outer tube 20 are respectively matched by sliding clearance. Sealing rings are respectively provided between the upper end of the outer edge of the piston 21 and the piston outer tube 20 and between the lower end of the inner hole of the piston 21 and the center rod 22 to improve the sealing performance of the first annular cavity. The outer edge of the lower end is connected and welded by threads, the upper end of the center rod 22 is fixedly connected to the inner hole of the connector 19 by threads, the outer edge of the anti-retraction tube 23 is stepped and the upper part is connected to the piston outer tube 20 by fine-tooth serrated threads, the thread tips on the anti-retraction tube 23 face upward, and the thread tips in the piston outer tube 20 face downward, so that the drilling fluid can enter the first annular cavity 26 between the connector 19 and the piston 21 in the piston outer tube 20 and push the piston 21 to force the anti-retraction tube 23 and the piston outer tube 20 to slip and move downward; the first annular cavity 26 is connected to the inner cavity of the limiting tube, and the sealing sleeve 24 is sleeved on the center rod 22 and is limited by the head 25 connected by threads and welded to the lower end of the center rod 22;

[0043] Strip holes 231 are evenly distributed on the circumference of the upper outer edge of the anti-retraction tube 23, so that the anti-retraction tube 23 has elasticity, so that the anti-retraction tube 23 can maintain the sealing state after moving down. A fluid channel 221 is provided at the upper end of the center rod 22, and the fluid channel 221 is formed by connecting a central blind hole and a radial hole that are arranged at the upper end of the center rod 22 and vertically penetrate each other. The first annular cavity 26 is connected with the inner cavity of the limit tube through the fluid channel 221. A positioning clamp edge is provided on the inner wall of the middle part of the piston outer tube 20, and the upper end of the piston 21 is clamped at the positioning clamp edge. A positioning shoulder 222 is provided on the outer edge of the middle part of the center rod 22, and the piston 21 is clamped on the positioning shoulder 222 after moving down to the maximum stroke, which is used to ensure that the sealing sleeve 24 reaches the designed tension that meets the sealing requirements when sealing the well, and at the same time transmits the drilling fluid pressure to the center rod 22 to ensure that the pressure in the inner cavity of the sealing anchor device reaches the designed sealing pressure when sealing.

[0044] When working, the specific steps are as follows:

[0045] 1. Connect the deflector to the drilling tool through joint 1 and lower it to the predetermined position underground. For the sidetrack wells that need to be oriented, directly lower the well logging instrument. The key slot of the well logging instrument guide sits on the positioning key to start the directional operation. After the deflector is placed in the azimuth, take out the well logging instrument, connect the square drill pipe or top drive through the drilling tool, and start the pump to pressure.

[0046] 2. After the pump is turned on and the pressure is applied, the high-pressure drilling fluid passes through the drill bit, the joint 1, the delivery device 3, the elbow body 8, the elbow seat 11, the liquid guide tube 12, the jet tube 13, the cone body, the limit tube 18, and the inner hole of the connector 19 in sequence, and reaches the central blind hole at the upper end of the center rod 22 and starts to hold the pressure, so that the drill bit is filled with high-pressure drilling fluid; the drilling fluid enters the second annular cavity 27 through the strip hole, pushes the cone body 17 upward and causes a "slip buckle" phenomenon with the limit tube 18, and at the same time, the drilling fluid enters the first annular cavity 26 through the fluid channel 221, pushes the piston 21 to force the stop tube 23 and the piston outer tube 20 to slip and move downward, thereby compressing the sealing sleeve 24 to deform and expand outward, and when the piston 21 moves down to the maximum stroke, it is stuck on the positioning shaft shoulder 222, and at this time, the sealing sleeve 24 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;

[0047] 3. After sealing the well, the drilling fluid pressure entering the second annular cavity 27 continues to increase. When it finally reaches the designed sealing pressure of 22 MPa or above, the cone 17 is pushed to cut the shear screw 16, and the radial slips 28 and the longitudinal slips 15 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.

[0048] 4. After the pressure is released, the drill tool is rotated forward, and the drill tool drives the feeder 3 to rotate to cut off the fastening screw 5 and the limit screw 10, so that the arc hook on the hook body 9 is screwed out of the arc slot, and after rotating 270 degrees, it is stuck on the inclined surface of the elbow seat and drives the lower end of the elbow body to be pulled out from the elbow seat; then the drill tool is pulled out, and the joint 1, the feeder 3, the hook body 9 and the elbow body 8 are taken out of the well together, and finally the milling cone is lowered to perform the window opening operation along the inclined surface of the bevel guide 6. After the window opening is completed, the drill bit is lowered to perform the subsequent side drilling operation. Since the bevel guide is only subjected to pressure and torque during the whole process of window opening and side drilling, the radial slip 28 and the longitudinal slip are stuck on the well wall to ensure that the circumferential direction and longitudinal position of the bevel guide are fixed, which can ensure the smooth completion of side drilling.

[0049] 5. After the window side drilling is completed, the remaining part of the guide can be recovered by salvaging tools. Use a mother cone to make a buckle on the upper part of the guide bevel iron 6 and then lift it up. The guide bevel iron 6 pulls the cylinder sleeve 14 upward. The cylinder sleeve 14 forcibly pushes the limit tube 18 in the cone 17 through the connector 19 to "jump" and move upward. At the same time, the cylinder sleeve 7 drives the longitudinal slip 15 and the radial slip 28 upward. Since the small head of the cone 17 is on the top, that is, the longitudinal slip 15 and the radial slip 28 slide above the small head of the cone 17, so that the longitudinal slip 15 and the radial slip 28 stuck on the well wall are loosened and unstuck. After unstuck, the sealing sleeve is driven upward synchronously through the center rod and the head, and the sealing anchor device and the sealing device can be driven to be all lifted out of the wellhead through the guide bevel iron 6, so that the recovery of the guide bevel is realized. After recovery, only the sealing sleeve 24 needs to be replaced for reuse.

[0050] 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 self-sealing well type recoverable hydraulic deflector, comprising a hollow joint, a feeder, a deflector wedge, a setting anchor device and a well sealing device connected in sequence, wherein the setting anchor device comprises a cylinder sleeve, a cone, a limit 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; a positioning shoulder is arranged at the outer edge of the middle part 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, 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; a plurality of strip holes arranged along its axial direction are evenly distributed on the outer wall of the limiting tube, which are used to introduce the drilling fluid into the second annular cavity and make the limiting tube elastic, so as to ensure the limiting of the conical body after setting; the slips are divided into a plurality of longitudinal slips and radial slips, which are alternately arranged and respectively evenly connected to the upper part of the outer edge of the conical body in the circumferential direction by shear screws, and are used to extend 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. When the piston moves downward to the maximum stroke, it is stuck on the positioning shaft shoulder. At this time, the sealing sleeve reaches the designed tension, blocking the annular space between the sealing device and the side drilling casing, thereby realizing 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 self-sealing well type recoverable hydraulic deflector according to claim 1 is characterized in that: 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 self-sealing well type recoverable hydraulic deflector according to claim 1 or 2 is characterized in that: The fluid channel is formed by connecting a central blind hole and radial holes which are vertically connected to each other.

4. The self-sealing well type recoverable hydraulic deflector according to claim 1 is characterized in that: 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.

5. The self-sealing well type recoverable hydraulic deflector 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 cone is clamped at the inner clamping edge.

6. The self-sealing well type recoverable hydraulic deflector according to claim 1 or 5, 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.

7. The self-sealing well type recoverable hydraulic deflector according to claim 6 is characterized by: A jet tube is also arranged in the cylinder sleeve, and two ends of the jet tube are respectively plugged and sealed with the inclined iron and the cone of the guide.

8. The self-sealing well type recoverable hydraulic deflector according to claim 1 is characterized by: A positioning key is radially provided on the joint, which protrudes from the inner wall of the joint and is aligned with the center line of the inclined surface of the bevel iron of the guide bevel device; 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 device, so as to facilitate the positioning of the logging instrument.

9. The self-sealing well type recoverable hydraulic deflector according to claim 8 is characterized in that: The feeder is pressed on the inclined surface of the inclined iron of the guide, and the upper end of the inclined surface of the guide and the positioning key are respectively located on both sides of the axis of the coaxially arranged joint and the feeder; a liquid guide tube connecting the feeder and the inner cavity of the setting anchor device is provided in the inclined iron of the guide.

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