Inclined uphole directional perforation device and directional perforation method thereof

Abstract

The invention discloses a directional perforation device for an inclined uphole and a directional perforation method of the directional perforation device. The directional perforation device for the inclined uphole comprises an upper joint, a key groove sleeve and a directional sleeve which are connected in sequence, the push pipe is axially connected in the upper joint in a sliding and sealing manner; comprising a directional pipe, an ejector and a rotating shaft which are sequentially connected, the directional pipe is rotationally connected into a directional sleeve, and the upper end of the directional pipe is rotationally and hermetically connected to the lower end of a push pipe; the rotating shaft is rotationally connected into the lower joint in a sealing manner; an annular groove is formed in the upper portion of the directional pipe, a notch extending downwards is formed in the lower side face of the annular groove, the lower side face of the annular groove inclines towards the notch, and then a curved face inclining downwards is formed on the lower side face of the annular groove. Compared with an existing single high-density ball and single directional groove structure, the stress contact area of the double balls and the double-spiral-groove structure is larger, the problem that abrasion of the spiral grooves is aggravated due to stress concentration is solved, the gravity ring cannot be clamped all the time, and positioning is accurate.

Description

Technical Field

[0001] The present invention belongs to the field of well mining equipment, and particularly relates to an upwardly inclined well directional perforating device and a directional perforating method thereof. Background Art

[0002] During the mining processes of shale gas wells, coal mines, and oil wells, downhole fracturing technology is involved. Downhole fracturing technology is to inject high-pressure liquid into the formation to form fractures in the formation, which is conducive to improving the gas drainage efficiency of coal mines, ensuring the safe production of coal mines while realizing the utilization of gas resources, and improving the oil and gas permeability and production of shale gas wells and oil wells. Therefore, downhole fracturing technology is an important means for mining coal resources and oil and gas resources. Existing downhole fracturing technologies include hydraulic fracturing technology, carbon dioxide fracturing technology, liquid nitrogen fracturing technology, etc., among which hydraulic fracturing is more common.

[0003] Perforating belongs to the pre-fracturing process. Classified according to the perforating principle, it includes molecular ejection perforating, shaped charge perforating, hydraulic jet perforating, etc. The specific construction method is to use a tubing string to send a perforating tool string to a designated position in the well, and then use a perforator to penetrate the casing, rock formation, or coal seam, etc. The technical problem existing in this construction method is: how to make the actual perforating position consistent with the designed perforating position. In response to this problem, the patent with the application number 2020106304025 discloses a directional fracturing perforating device for coal mines underground, which uses the gravity of a high-density ball and combines it with the guidance of an arc-shaped directional groove to lock the perforating direction. Although it is pointed out that it is not limited to horizontal drilling and upwardly inclined drilling, it is difficult to accurately position for upwardly inclined drilling for the following reasons:

[0004] The tool string moves obliquely upward under the push of the tubing string, and the tool string is always in an upwardly inclined state. The high-density ball will roll towards the push tube direction and into a clamping groove of the push tube, but the clamping groove into which the high-density ball is stuck is very likely not the lowest point, that is, the high-density ball cannot naturally roll to the lowest point under the action of gravity, resulting in positioning deviation.

[0005] In addition, the above-mentioned directional fracturing perforating device also has the following problems:

[0006] 1. During the process of the push tube pushing the high-density ball stuck in the clamping groove to move axially, the push tube receives a radial reaction force, that is, it increases the radial stress of the push tube and at the same time weakens the thrust on the high-density ball, which is not conducive to the ejector rotating to the set position.

[0007] 2. The contact area between a single high-density ball and the directional tube is small, and stress concentration occurs on the directional groove. Especially, the stress on the arc-shaped edge of the directional groove is the largest. When the ejector encounters resistance, the stress on the arc-shaped edge will increase exponentially. After being squeezed by high stress many times, the arc-shaped edge is severely worn, and the normal service life of the directional fracturing perforating device is significantly reduced. Summary of the Invention

[0008] In view of the deficiencies of the prior art, the present invention provides an inclined upward well directional perforating device, which includes an upper joint, a keyway casing and a directional casing connected in sequence; a push tube axially slidably and sealingly connected inside the upper joint; a directional tube, an injector and a rotating shaft connected in sequence, the directional tube is rotatably connected inside the directional casing, and the upper end of the directional tube is rotatably and sealingly connected to the lower end of the push tube; the rotating shaft is rotatably and sealingly connected inside the lower joint; further includes a gravity ring sleeved on the upper part of the directional tube, the upper part of the directional tube is provided with an annular groove, the lower side of the annular groove is provided with a notch extending downward and the lower side is inclined toward the notch, so that the lower side of the annular groove forms a downwardly inclined curved surface; the upper part of the directional tube is also provided with N turns of double spiral grooves, and the starting end of the double spiral groove is communicated with the notch; the inner side of the gravity ring is provided with balls corresponding to the double spiral grooves one by one, and the width of the two balls is less than the width of the annular groove, and the two balls roll in the double spiral grooves one by one, so that the gravity ring and the directional tube rotate relative to each other; a gravity block is arranged in the inner cavity of the gravity ring, and the gravity block and the two balls are on the same radial straight line, and at least two upper positioning beads are arranged on the upper surface of the gravity ring, and a circle of positioning holes adapted to the upper positioning beads are distributed on the lower end surface of the push tube, and the upper positioning beads are snapped into the corresponding positioning holes, so that the gravity ring and the push tube move axially synchronously.

[0009] The preferred scheme of the inclined upward well directional perforating device in the present invention is: the upper part of the directional tube is provided with a stepped surface, and the double spiral groove is located between the push tube and the stepped surface; the stepped surface is provided with an annular positioning groove, and the lower end surface of the gravity ring is provided with a lower positioning bead adapted to the annular positioning groove. When the two balls roll to the end of the double spiral groove, the lower positioning bead just rolls to the end of the annular positioning groove, and the final position of the directional tube is locked by the two balls and a lower positioning bead together, sharing the stress received by the balls and the double spiral groove, and avoiding stress concentration and excessive wear.

[0010] The preferred solution of the oblique well directional perforating device in the present invention is: the inner side surface of the gravity ring is provided with a balancing bead in contact with the outer surface of the positioning tube, and at least two balancing beads are provided, and all the balancing beads and the rolling balls are evenly distributed on the inner side surface of the gravity ring along the circumferential direction. When the two rolling balls roll into the double spiral groove, the balancing bead contacts the positioning tube, and the gravity ring is supported at multiple points, and a rotational torque is applied to the positioning tube from multiple directions. The anti-eccentricity, anti-resistance, and anti-radial stress of the positioning tube and the push tube are all improved, and the rotation is more stable. Furthermore, the inner side surface of the gravity ring is provided with a slot adapted to the balancing bead, and each balancing bead is not less than 1 / 2 located in the corresponding slot, and the balancing bead can roll in the slot. Since the gravity ring is in the annular groove, all the balancing beads are suspended in the air, so the balancing beads need to be kept in the slot, and more than half of the balancing beads are stuck in the slot, and the suspension does not leave the slot, which does not affect the rotation of the gravity ring in the annular groove. In addition, the width of the two balls is less than 1 / 2 of the width of the annular groove, and the depth of the notch is at least greater than 1 / 3 of the width of the two balls. When the width of the annular groove is greater than twice that of the two balls, the tool is in an oblique upward state, and the gravity ring has a larger range of rotation in the annular groove, which does not hinder the gravity block in the gravity ring from maintaining the lowest position. The depth of the notch needs to be greater than twice the width of the two balls because: when the roller rolls along the inclined lower side of the annular groove to the notch, the two balls instantly fall into the notch, avoiding one ball falling into the notch while the other ball is stuck outside the notch, that is, the gravity ring is stuck.

[0011] The preferred solution of the directional perforating device for inclined wells in the present invention is that: a plurality of injection nozzles are arranged on the side of the injector, and at least one injection nozzle is located in the same plane as the end of the double spiral groove. In order to distinguish the perforation orientation, the clock orientation representation method is used to more easily obtain the relationship between the perforation position and the injection nozzle position, and the positioning method is clear and easy to understand.

[0012] The beneficial effects of the inclined well directional perforating device of the present invention are:

[0013] 1. Compared with the existing high-density balls, the upper positioning beads are fixed on the gravity ring. Even in the upward tilt state, the upper positioning beads cannot roll freely to the positioning hole and get stuck, thus solving the problem of the upper positioning beads being positioned incorrectly. In the process of moving upward, vibration and shaking occur. Under the action of gravity, the gravity block in the gravity ring is always at the lowest point. The two balls roll adaptively in the annular groove, and the gravity ring will never get stuck, so the positioning is accurate.

[0014] 2. Compared with the existing single high-density ball and single directional groove structure, the double ball and double spiral groove structure has a larger stress contact area, which avoids the problem of increased wear of the spiral groove due to stress concentration, and is conducive to maintaining the normal use of the inclined well directional perforating device.

[0015] The present invention also provides a directional perforation method for an inclined upward well directional perforation device. Based on the above-mentioned inclined upward well directional perforation device, the method includes the following steps:

[0016] First, complete the installation of the tool string. Connect the upper end of the tubing to the upper joint, and connect the lower end of the whipstock to the lower joint. Then, select the appropriate injection nozzles for perforation according to the clockwise azimuth representation method. For example, if the perforation direction is the six o'clock direction, retain the injection nozzles located in the same plane at the end of the double spiral groove, and block the remaining injection nozzles; if the perforation direction is the nine o'clock direction, retain the injection nozzles at a 90° angle to the end of the double spiral groove, and block the remaining injection nozzles; select the corresponding injection nozzles according to the specific perforation azimuth in the same way.

[0017] Then, send the inclined upward well directional perforation device into the inclined upward well through the tubing. During the pushing process, due to the gravity of the gravity block, the gravity ring always rotates in the annular groove. Two balls roll between the annular groove and the gravity ring, and the gravity block is always located at the lowest point in the inner cavity of the gravity ring. After the inclined upward well directional perforation device is pushed to the perforation position, pump pressure fluid into the tubing. The pressure fluid pushes the push tube to move axially, and the upper positioning bead snaps into the corresponding positioning hole. The push tube pushes the gravity ring to continue moving axially synchronously. The two balls roll into the double spiral groove one by one after passing through the notch, and the directional tube drives the injector to rotate. During the rotation of the directional tube, the gravity ring gradually approaches the step surface, and the lower positioning bead gradually aligns with the annular positioning groove. When the two balls roll to the end of the double spiral groove, at the same time, the lower positioning bead rolls to the end of the annular positioning groove;

[0018] Finally, the injection nozzles are in the same direction as the perforation direction, and the injection nozzles perform perforation, and the perforation is completed. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a three-dimensional view of the inclined upward well directional perforation device in the present invention;

[0021] Figure 2 is Figure 1 a schematic diagram after hiding the directional casing in

[0022] Figure 3 is Figure 2 a schematic diagram after hiding the gravity ring in Figure 1 ;

[0023] Figure 4 isFigure 2 Schematic diagram after hiding the gravity ring Figure 2 ;

[0024] Figure 5 This is a schematic diagram of the inclined upward well directional perforating device in the present invention after being placed horizontally;

[0025] Figure 6 is Figure 5 A - A cross - sectional view in

[0026] Reference numerals: upper joint 1, keyway casing 2, directional casing 3, push tube 4, force - receiving end face 5, directional tube 6, injector 7, rotating shaft 8, return spring 9, rotating bearing 10, end cap 11, gravity ring 12, annular groove 13, notch 14, lower side face 15, double - helix groove 16, ball 17, balance bead 18, lower joint 19, gravity block 20, upper positioning bead 21, positioning hole 22, step face 23, annular positioning groove 24, lower positioning bead 25, injection nozzle 26. Detailed implementation manners

[0027] In view of the deficiencies in the prior art, the inventors of this case have proposed the technical solution of the present invention through long - term research and a large number of practices. The following will further explain the technical solution, its implementation process and principle, etc. in combination with the drawings in the embodiments of this application and specific implementation cases.

[0028] Embodiment 1:

[0029] As Figure 1 shown, Embodiment 1 provides an inclined upward well directional perforating device, including an upper joint 1, a keyway casing 2 and a directional casing 3 connected in sequence. The connection manner between the upper joint 1, the keyway casing 2 and the directional casing 3 is not limited, and can be threaded or fixedly connected, and the upper end of the upper joint 1 is detachably connected to the oil pipe by threads.

[0030] As Figure 6 shown, this embodiment also includes a push tube 4 axially slidably and sealingly connected inside the upper joint 1. The upper end of the push tube 4 is provided with a force - receiving end face 5 in contact with the pressure fluid. When the pressure fluid flows through the push tube 4, it will push the push tube 4 to slide axially.

[0031] As Figure 2 and 6As shown in the figure, this embodiment further includes an orientation tube 6, an injector 7, and a rotating shaft 8 that are connected in sequence. The orientation tube 6 is rotatably connected within the orientation sleeve 3, and the upper end of the orientation tube 6 is rotatably and sealingly connected to the lower end of the push tube 4. In addition, a return spring 9 is provided inside the push tube 4. The lower end of the return spring 9 is located at the upper end of the orientation tube 6. When the push tube 4 axially slides along with the pressure liquid, the return spring 9 is compressed simultaneously. When the pressure liquid supply stops, the elastic force of the return spring 9 causes the orientation tube 6 and the push tube 4 to reset. The rotating shaft 8 is rotatably and sealingly connected within the lower joint 19. The rotating shaft 8 is used to balance the force on the injector 7. Rotating bearings 10 are provided between the rotating shaft 8 and the lower joint 19, and between the orientation tube 6 and the orientation sleeve 3. The lower end of the orientation sleeve 3 is provided with an end cap 11 for sealing. All the sealing connection relationships involved in this embodiment refer to the use of sealing rings for sealing at the connection points.

[0032] The upwardly inclined well directional perforating device of this embodiment is specifically used for perforating upwardly inclined wells and is not suitable for horizontal wells and downwardly inclined well perforating. In order to achieve accurate perforation, this embodiment uses the clock azimuth representation method to quickly judge the perforation azimuth and adopts the following structure to achieve positioning:

[0033] As Figures 2 to 5 shown, it includes a gravity ring 12 sleeved on the upper part of the orientation tube 6. An annular groove 13 is provided on the upper part of the orientation tube 6. There is a gap between the annular groove 13 and the lower end of the push tube 4 that has not axially moved, and this gap can prevent the gravity ring 12 from contacting the push tube 4. The lower side 15 of the annular groove 13 is provided with a notch 14 extending downward, and the lower side 15 inclines towards the notch 14, so that the lower side 15 of the annular groove 13 forms a downwardly inclined curved surface. Here, the curved surface enables the positioning tube to rotate when the push tube 4 drives the gravity ring 12 to axially move. Two turns of double spiral grooves 16 are also provided on the upper part of the orientation tube 6, but not limited to two turns. It can be 1.5 turns, 3 turns, etc. The starting end of the double spiral groove 16 is communicated with the notch 14. Ball bearings 17 corresponding to the double spiral grooves 16 one by one are provided on the inner side surface of the gravity ring 12, and the width of the two ball bearings 17 is less than the width of the annular groove 13. By the two ball bearings 17 rolling in the double spiral grooves 16 one by one, the gravity ring 12 and the orientation tube 6 rotate relative to each other. The principle of the relative rotation between the gravity ring 12 and the orientation tube 6 is as follows:

[0034] When the gravity ring 12 is combined with the push tube 4, the gravity ring 12 can only move axially with the push tube 4 and cannot rotate. The two balls 17 of the gravity ring 12 first contact the lower side 15 of the annular groove 13. Since the lower side 15 is inclined towards the notch 14, the positioning tube rotates relative to the gravity ring 12 until the two balls 17 fall into the notch 14. Since the double spiral groove 16 is also inclined, the two balls 17 roll along the spiral direction after falling into the notch 14, thereby pushing the positioning tube to rotate again. It should be noted here that the inclination direction of the lower side 15 of the annular groove 13 on the left side of the notch 14 is opposite to that of the lower side 15 of the annular groove 13 on the right side of the notch 14. Whether the two balls 17 fall into the notch 14 from the right side or the left side of the notch 14, the two balls 17 can push the positioning tube to rotate. Only the direction of pushing the positioning tube to rotate after falling into the notch 14 may be the same as or opposite to the prior rotation direction, but neither affects the final positioning. If the directions are the same, the inclination direction of the lower side 15 where the two balls 17 are located before falling into the notch 14 is the same as the direction of the double spiral groove 16; conversely, the inclination direction of the lower side 15 where the two balls 17 are located before falling into the notch 14 is opposite to the direction of the double spiral groove 16. In addition, balance beads 18 that contact the outer surface of the positioning tube are provided on the inner side of the gravity ring 12. There are at least two balance beads 18, which can be three or more. This embodiment does not make any restrictions. All the balance beads 18 and the balls 17 are evenly distributed along the circumferential direction on the inner side of the gravity ring 12. When the two balls 17 roll into the double spiral groove 16, the balance beads 18 contact the positioning tube, and the gravity ring 12 is supported at multiple points, applying a rotational torque to the positioning tube from multiple directions. The anti-eccentricity, anti-resistance, anti-radial stress, etc. of the positioning tube and the push tube 4 are all improved, and the rotation is more stable. Further, a card slot adapted to the balance beads 18 is provided on the inner side of the gravity ring 12. Each balance bead 18 has at least 1 / 2 part located in the corresponding card slot, and the balance bead 18 can roll in the card slot. Since the gravity ring 12 is in the annular groove 13, all the balance beads 18 are suspended. Therefore, in order to keep the balance beads 18 in the card slot, more than half of the balance beads 18 are stuck in the card slot, suspended without detaching from the card slot, and do not affect the rotation of the gravity ring 12 in the annular groove 13.

[0035] As Figure 6As shown, during the inclined upward movement, in order to keep the orientation of the gravity ring 12 unchanged, a gravity block 20 is provided in the inner cavity of the gravity ring 12, and the gravity block 20 and the two balls 17 are located on the same radial straight line. The gravity block 20 has a large density and a heavy mass. When the gravity ring 12 rotates freely in the annular groove 13, the gravity block 20 is always located at the lowest point. Three upper positioning beads 21 are provided on the upper surface of the gravity ring 12, and it can also be two, four, etc. This embodiment does not make any restrictions, but the number must be greater than one. A circle of positioning holes 22 adapted to the upper positioning beads 21 are distributed on the lower end surface of the push tube 4. By inserting the upper positioning beads 21 into the corresponding positioning holes 22, the gravity ring 12 and the push tube 4 are axially moved synchronously. The positioning principle is similar to the existing high-density ball positioning, which is to use the gravity effect to keep the gravity block 20 always at the lowest point to maintain the orientation of the gravity ring 12 unchanged during the upward movement. In order to enable the gravity ring 12 to rotate accordingly in the annular groove 13 during the movement, this embodiment will limit the dimensions of the width of the annular groove 13 and the depth of the notch 14: the width of the two balls 17 is less than 1 / 2 of the width of the annular groove 13, that is, the annular groove 13 is more than twice as wide as the two balls 17 and is in an obliquely upward state, so that the gravity ring 12 has a larger rotation range in the annular groove 13 and does not prevent the gravity block 20 in the gravity ring 12 from maintaining the lowest position. The depth of the notch 14 is at least greater than 1 / 3 of the width of the two balls 17. For example, the depth of the notch 14 is greater than twice the width of the two balls 17. When the roller rolls along the inclined lower side surface 15 of the annular groove 13 to the notch 14, the two balls 17 instantly fall into the notch 14, avoiding the situation where one ball 17 falls into the notch 14 while the other ball 17 is stuck outside the notch 14, that is, the defect of the gravity ring 12 being stuck.

[0036] The two balls 17 and the double spiral groove 16 can indeed improve the stress concentration problem. In order to further improve this problem, especially the stress when the orientation tube 6 rotates to the final position. In this embodiment, a stepped surface 23 is provided on the upper part of the orientation tube 6, and the double spiral groove 16 is located between the push tube 4 and the stepped surface 23; an annular positioning groove 24 is provided on the stepped surface 23, and a lower positioning bead 25 adapted to the annular positioning groove 24 is provided on the lower end surface of the gravity ring 12. When the two balls 17 roll to the end of the double spiral groove 16, the lower positioning bead 25 just rolls to the end of the annular positioning groove 24. The final position of the orientation tube 6 is locked jointly by the two balls 17 and a lower positioning bead 25, sharing the stress received by the balls 17 and the double spiral groove 16 and avoiding stress concentration and excessive wear.

[0037] Similar to the existing injector 7, multiple injection nozzles 26 are provided on the side of the injector 7 in this embodiment. The number of injection nozzles 26 is selected according to the actual situation, but not all injection nozzles 26 are used simultaneously. At least one injection nozzle 26 is in the same plane as the end of the double spiral groove 16. After the positioning tube is positioned, this injection nozzle 26 always faces downward, that is, at the six o'clock direction. If the injection direction is ten o'clock, the injection nozzle 26 is used and the remaining injection nozzles 26 are blocked. Similarly, this positioning method is also used for the perforation directions at other positions, and the positioning method is simple.

[0038] Embodiment 2:

[0039] Embodiment 2 provides a directional perforation method for an uphole directional perforation device. Based on the inclined uphole directional perforation device of Embodiment 1, the method is as follows:

[0040] Taking the perforation direction at twelve o'clock as an example, first, the tool string is installed. The tubing is connected to the upper end of the upper joint 1, and the whipstock is connected to the lower end of the lower joint 19. Then, the appropriate injection nozzle 26 in the twelve o'clock direction is selected for perforation according to the clockwise azimuth representation method. The injection nozzle 26 in the same plane as the end of the double spiral groove 16 is at the six o'clock direction. Based on the injection nozzle 26 at the six o'clock direction, the injection nozzle 26 in the twelve o'clock direction can be easily found. The injection nozzle 26 in the twelve o'clock direction is not blocked, and the injection nozzles 26 in the other directions are all blocked.

[0041] Then, the inclined uphole directional perforation device is sent into the inclined uphole through the tubing. During the pushing process, vibrations, jitters, etc. will occur, but the gravity of the gravity block 20 causes the gravity ring 12 to always rotate correspondingly in the annular groove 13, that is, the two balls 17 roll between the annular groove 13 and the gravity ring 12, so that the gravity block 20 is always at the lowest point in the inner cavity of the gravity ring 12, and the two balls 17 are also at the lowest point. After the inclined uphole directional perforation device is pushed to the perforation position, pressure fluid is pumped into the tubing. The pressure fluid pushes the push tube 4 to move axially, and all three upper positioning beads 21 are stuck into the corresponding positioning holes 22. The push tube 4 pushes the gravity ring 12 to continue moving axially synchronously. At this time, the two balls 17 and the gravity block 20 are both at the lowest point, that is, the six o'clock direction. After the two balls 17 contact the lower side 15 of the annular groove 13, since the gravity ring 12 does not rotate, the positioning tube rotates, the directional tube 6 drives the injector 7 to rotate, and the two balls 17 roll into the double spiral groove 16 one by one after passing through the notch 14. During the rotation of the directional tube 6, the gravity ring 12 gradually approaches the step surface 23, and the lower positioning bead 25 gradually aligns with the annular positioning groove 24. When the two balls 17 roll to the end of the double spiral groove 16, at the same time, the lower positioning bead 25 rolls to the end of the annular positioning groove 24. Since the two balls 17 are at the six o'clock direction, the end of the double spiral groove 16 will also stay at the six o'clock direction, and the injection nozzle 26 in the twelve o'clock direction is just opposite to the twelve o'clock perforation azimuth, and the positioning is completed.

[0042] Finally, the injection nozzle 26 is aligned with the perforation direction, and the injection nozzle 26 perforates, and the perforation is completed.

[0043] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A directional perforating device for inclined wells, comprising an upper joint (1), a keyway casing (2) and a directional casing (3) connected in sequence; It comprises a push tube (4) which is axially slidingly and sealingly connected to the interior of the upper joint (1); It comprises a directional tube (6), an ejector (7) and a rotating shaft (8) which are connected in sequence, wherein the directional tube (6) is rotatably connected to the directional sleeve (3), and the upper end of the directional tube (6) is rotatably sealed and connected to the lower end of the push tube (4); the rotating shaft (8) is rotatably sealed and connected to the lower joint (19); Features: The directional tube (6) further comprises a gravity ring (12) sleeved on the upper part of the directional tube (6); the upper part of the directional tube (6) is provided with an annular groove (13); the lower side surface (15) of the annular groove (13) is provided with a notch (14) extending downward, and the lower side surface (15) is inclined toward the notch (14), so that the lower side surface (15) of the annular groove (13) forms a curved surface inclined downward; the upper part of the directional tube (6) is also provided with N circles of double helical grooves (16), and the head end of the double helical groove (16) is connected to the notch (14); The inner side surface of the gravity ring (12) is provided with balls (17) corresponding to the double helical grooves (16) one by one, and the width of the two balls (17) is smaller than the width of the annular groove (13). The two balls (17) roll in the double helical grooves (16) one by one, thereby causing the gravity ring (12) and the directional tube (6) to rotate relative to each other. A gravity block (20) is provided in the inner cavity of the gravity ring (12), and the gravity block (20) and the two balls (17) are located on the same radial straight line. At least two upper positioning beads (21) are provided on the upper surface of the gravity ring (12). A circle of positioning holes (22) adapted to the upper positioning beads (21) are distributed on the lower end surface of the push tube (4). The upper positioning beads (21) are inserted into the corresponding positioning holes (22), thereby causing the gravity ring (12) and the push tube (4) to move axially synchronously.

2. The directional perforating device for inclined wells according to claim 1, characterized in that: The upper part of the directional tube (6) is provided with a step surface (23), and the double helical groove (16) is located between the push tube (4) and the step surface (23); the step surface (23) is provided with an annular positioning groove (24), and the lower end surface of the gravity ring (12) is provided with a lower positioning bead (25) adapted to the annular positioning groove (24).

3. The directional perforating device for inclined wells according to claim 2, characterized in that: The inner side surface of the gravity ring (12) is provided with a balancing bead (18) in contact with the outer surface of the positioning tube. There are at least two balancing beads (18), and all the balancing beads (18) and the rolling balls (17) are evenly distributed on the inner side surface of the gravity ring (12) along the circumferential direction.

4. The directional perforating device for inclined wells according to claim 3, characterized in that: The inner side surface of the gravity ring (12) is provided with a slot adapted to the balancing bead (18), and at least 1 / 2 of each balancing bead (18) is located in the corresponding slot, and the balancing bead (18) can roll in the slot.

5. The directional perforating device for inclined wells according to claim 4, characterized in that: A plurality of injection nozzles (26) are provided on the side of the injector (7), and at least one injection nozzle (26) is located in the same plane as the end of the double helical groove (16).

6. The directional perforating device for inclined wells according to claim 5, characterized in that: The width of the two balls (17) is less than 1 / 2 of the width of the annular groove (13), and the depth of the notch (14) is at least greater than 1 / 3 of the width of the two balls (17).

7. A directional perforating method for a directional perforating device for an inclined well, characterized in that: Based on the inclined well directional perforating device according to claim 6, the steps are as follows: S1, the oil pipe is connected to the upper end of the upper joint (1), and the deflector is connected to the lower end of the lower joint (19); S2. If the perforating direction is the six o'clock direction, the injection nozzle (26) located in the same plane as the end of the double spiral groove (16) is retained, and the other injection nozzles (26) are blocked; if the perforating direction is the nine o'clock direction, the injection nozzle (26) at a 90° angle to the end of the double spiral groove (16) is retained, and the other injection nozzles (26) are blocked; the corresponding injection nozzle (26) is selected according to the specific perforating orientation in the same way; S3. The inclined well directional perforating device is sent into the inclined well through the oil pipe. During the pushing process, the gravity of the gravity block (20) causes the gravity ring (12) to rotate in the annular groove (13) all the time, and the two balls (17) roll between the annular groove (13) and the gravity ring (12), and the gravity block (20) is always located at the lowest point of the inner cavity of the gravity ring (12); S4, after the inclined well directional perforating device is pushed to the perforating position, pressure liquid is pumped into the oil pipe, the pressure liquid pushes the push pipe (4) to move axially, the upper positioning bead (21) is inserted into the corresponding positioning hole (22), the push pipe (4) pushes the gravity ring (12) to continue to move axially synchronously, the two balls (17) pass through the notch (14) and roll into the double helical groove (16) one by one, and the directional pipe (6) drives the ejector (7) to rotate; S5. During the rotation of the directional tube (6), the gravity ring (12) gradually approaches the step surface (23), and the lower positioning ball (25) gradually aligns with the annular positioning groove (24). When the two balls (17) roll to the end of the double helical groove (16), the lower positioning ball (25) rolls to the end of the annular positioning groove (24). S6. The jet nozzle (26) is aligned with the perforation direction, the jet nozzle (26) perforates, and the perforation is completed.

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