Friction type open hole suspension packer and setting method thereof

Abstract

The invention belongs to the technical field of oil extraction of oil and gas fields, and particularly relates to a friction type open hole suspension packer and a setting method thereof. The packer comprises a central pipe, a sealing rubber sleeve mechanism, a piston mechanism and a friction type slip mechanism, the central pipe is sleeved with the sealing rubber sleeve mechanism, the piston mechanism and the friction type slip mechanism, all the mechanisms are sequentially arranged on the central pipe in a sleeving mode, and the adjacent structures abut against or are connected in an embedded mode. The sealing rubber sleeve mechanism comprises a sealing middle rubber sleeve structure and a sealing edge rubber sleeve structure; the piston mechanism comprises a piston structure and a piston cylinder structure; the number of the friction type slip mechanisms is not less than three, each friction type slip mechanism comprises a friction type slip structure and a cone structure, and an anchoring groove structure is arranged on the outer surface of each friction type slip structure. The packer is anchored at an open hole section under the cooperation of the piston mechanism, the sealing rubber sleeve mechanism and the friction type slip mechanism, a progressive opening mode is adopted, the resistance of the slip in the moving process is greatly reduced, the friction type slip can make full contact with rock by 360 degrees and enter the stratum rock mutually, and anchoring between the packer and the open hole section is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field oil production, gas production, well completion and production enhancement or well repair application, and in particular relates to a friction type open hole suspension packer and a setting method thereof. Background Art

[0002] In the development process of oil and gas field production, gas production, completion and production increase, and well repair, the packer is an indispensable downhole tool. The packer seals the annular space between the oil pipe and the casing by expanding the rubber tube outward, plays a role in setting the seal, allows gas or liquid to pass through the central channel, and controls the flow of fluid. There are a large number of open-hole completion production wells in various oil fields at home and abroad. When implementing measures or anchoring and dropping the production string in the open hole section, it is necessary to lower the suspension seal packer. At present, there is no corresponding hanger that can be anchored in the open hole section. The main reason is that after the open hole is drilled, the wellbore is rock, and the metal slip cannot be engaged and anchored with the rock, so the packer cannot be suspended in the open hole section. For the construction of measures in the open hole section, such as water jam, expansion packers or water-expandable packers are generally used. The disadvantages are that there is a short validity period, the length of the packer is very long, and the construction is difficult.

[0003] Based on the above problems, an open hole suspension packer and a setting method suitable for setting in an open hole section are designed, which has important practical significance. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a friction type open hole suspension packer and a setting method thereof.

[0005] The technical solution is as follows: A friction type open hole suspension packer comprises a central tube, on which a sealing rubber tube mechanism, a piston mechanism and a friction type slip mechanism are sleeved, each mechanism is sleeved on the central tube in sequence, and each adjacent mechanism / structure on the central tube abuts or is embedded with each other, wherein: The sealing rubber cylinder mechanism comprises a sealing middle rubber cylinder structure and sealing side rubber cylinder structures arranged on both sides of the sealing structure; The piston mechanism includes a piston structure and a piston cylinder structure. By locking the position of the piston mechanism, the sealing rubber cylinder mechanism can be kept in a set state; The friction-resistance slip mechanism has no less than three groups, which are respectively arranged on both sides of the sealing rubber cylinder mechanism. The friction-resistance slip mechanism includes a friction-resistance slip structure and a cone structure arranged on both sides of the friction-resistance slip structure. The outer surface of the friction-resistance slip structure is provided with an anchoring groove structure.

[0006] In the above technical solution, at least two groups of friction slip mechanisms are successively mounted on the central tube between the sealing rubber tube mechanism and the piston mechanism, and at least one group of friction slip mechanisms is successively mounted on the central tube of the sealing rubber tube mechanism away from the piston mechanism.

[0007] In the above technical solution, the sealed middle rubber tube structure includes a middle rubber tube sleeved on the outside of the central tube, an inner sealing ring formed inside the middle rubber tube, and a sealing ring sleeved on the outside of the central tube and located inside the inner sealing ring.

[0008] In the above technical scheme, the sealing edge rubber cylinder structure includes a edge rubber cylinder which is sleeved on the outside of the center tube, and the end of the edge rubber cylinder facing the middle rubber cylinder is formed with an inner circular table surface which cooperates with the circular table surface of the middle rubber cylinder, so that the middle rubber cylinder is accommodated in the annular space surrounded by the two edge rubber cylinders; the end of the side rubber cylinder facing away from the middle rubber cylinder is convexly formed with a circular table surface and a rubber cylinder protection ring which matches its shape is pressed on it.

[0009] In the above technical solution, the friction slip structure includes a friction slip mounted on the outside of the central tube; the cone structure includes a cone mounted on the outside of the central tube, and the inner walls at both ends of the friction slip are respectively formed with inner cone surfaces that cooperate with the cone surface of the cone, so that the friction slip is placed in an annular space enclosed by the two cones.

[0010] In the above technical solution, the friction slip is a cylindrical structure made of a soft metal material with a certain hardness, and the anchoring groove structure includes a plurality of annular grooves arranged on the outer surface of the friction slip.

[0011] In the above technical solution, a positioning sleeve is also sleeved on the central tube between the sealing rubber tube mechanism and the piston mechanism, and the friction slip mechanism between the sealing rubber tube mechanism and the piston mechanism is sleeved on the outside of the positioning sleeve.

[0012] In the above technical solution, the piston structure includes a locking sleeve, a locking ring and an anti-rotation pin. The locking sleeve is sleeved on the outside of the central tube through the locking ring and is fixed to the central tube through the anti-rotation pin.

[0013] In the above technical solution, the piston cylinder structure includes a piston cylinder formed on the outside of the center tube, and a semi-enclosed annular space is enclosed between the piston cylinder and the center tube. The locking sleeve is protruded on one end facing the piston cylinder and is formed with a long-side annular protrusion adapted to be embedded in the semi-enclosed annular space. The long-side annular protrusion of the locking sleeve is sealed and connected to the piston cylinder and the center tube through a sealing ring, and is fixed to the piston cylinder through a safety pin.

[0014] In the above technical solution, a step support structure is arranged between the center tube and the outermost friction-type cava mechanism, and the step support structure includes at least two levels of center tube steps formed on the outer wall of the center tube and with gradually decreasing diameters. The inner wall of one cone of the friction-type cava mechanism is recessed inward to form an inner step surface that cooperates with the center tube step, and the other cone is fixed to the center tube by a positioning pin.

[0015] In the above technical solution, a snap-fit ​​structure is provided between the locking sleeve and the friction slip mechanism located at the innermost side.

[0016] In the above technical solution, the engaging structure includes: The protrusion is formed as a short-side annular protrusion on one end of the locking sleeve facing the friction slip mechanism; The inner cylindrical surface of the cone close to the locking sleeve is concavely formed so that the short-side annular protrusion of the locking sleeve is accommodated in the inner cylindrical surface of the cone.

[0017] In the above technical solution, in the friction slip mechanisms other than the friction slip mechanisms located at the outermost and innermost sides, the two cones therein are fixed to the central tube via positioning pins respectively.

[0018] In the above technical solution, in the friction slip mechanism located at the outermost side, one cone is abutted against the central tube through a step support structure, and the other cone is fixed to the central tube through a positioning pin.

[0019] In the above technical solution, in the innermost friction slip mechanism, one cone is engaged with the locking sleeve through the engaging structure and fixed with the positioning sleeve through the release pin, and the other cone is fixed with the positioning sleeve through the positioning pin.

[0020] In the above technical solution, in the two adjacently arranged friction slip mechanisms, the two cones close to each other are designed as an integral piece and are fixed to the center tube through a common positioning pin.

[0021] The second invention object of the present invention is to provide a method for setting a friction-type open hole suspension packer, comprising the following steps: S1. When the packer, other pipe strings and tools are put into the well and reach the designed position, the oil pipe is pressurized. When the pressure reaches the designed starting pressure, the safety pin is sheared off under the hydraulic action of the piston structure, and the piston structure moves toward the friction slip mechanism and the sealing rubber cylinder mechanism; S2, first cut off the positioning pin closest to the inner side of the sealing rubber tube mechanism, and the cone closest to the inner side of the sealing rubber tube mechanism pushes the rubber tube protection ring, the side rubber tube, the middle rubber tube, the inner sealing ring and the sealing ring in the sealing rubber tube mechanism to move, and then cut off the positioning pin closest to the outer side of the sealing rubber tube mechanism, and the cone closest to the outer side of the sealing rubber tube mechanism pushes the outermost first friction slip mechanism to open, contact with the open hole section and anchor; S3, continue to pressurize, each rubber cylinder in the sealing rubber cylinder mechanism contacts with the open hole section to achieve annular space sealing; S4, continue to increase the pressure to press, the second friction slip mechanism arranged from the outside to the inside opens and anchors with the open hole section, continue to press, the third friction slip mechanism opens and anchors, and so on, after multiple presses, until the last friction slip mechanism opens and anchors; S5. After reaching the design pressure, the locking sleeve, locking ring and center pipe in the sealing structure are locked by the thorns to achieve sealing and anchoring of the annulus.

[0022] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows: 1. The present invention adopts a friction slip whose friction force is greater than the force generated by the pressure acting on the packer. The principle is that the friction slip contacts the rock of the open hole section, and under the action of the outward radial force of the cone, upward and downward friction forces are generated to achieve anchoring between the packer and the open hole section.

[0023] 2. In the present invention, the friction slips are made of soft metal materials with a certain hardness, which is similar to that of rocks. Under the action of piston force, the slips generate radial force, interact with the formation rocks in the open hole section, generate friction force, and achieve anchoring. The slip surface is designed with grooves, which enter into the formation rocks to generate greater friction resistance. The cylindrical structure design allows 360-degree full contact with the rocks under the action of radial force.

[0024] 3. In the present invention, more than three groups of friction slips are opened from left to right in sequence. The progressive design greatly reduces the resistance of the slips during movement.

[0025] In addition, as auxiliary evidence of the creativity of the present invention, it is also embodied in that the friction-resistance open hole suspension packer in the present invention can be anchored in the open hole section with the cooperation of the piston mechanism, the sealing rubber tube mechanism and the friction-resistance cava mechanism, and adopts a progressive opening method, which greatly reduces the resistance of the cava during movement. The friction-resistance cava can have 360-degree full contact with the rock and enter into the formation rock to generate greater friction resistance, thereby achieving anchoring between the packer and the open hole section. The packer is suspended in the open hole section, which is effective for a long time and easy to construct, filling the technical gap in the field of open hole suspension packers in the industry at home and abroad. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, serve to explain the principles of the present disclosure; Figure 1 It is a structural schematic diagram of Example 1 of the present invention; Figure 2 It is a partially enlarged schematic diagram of the first friction slip mechanism in the present invention; Figure 3 It is a partial enlarged schematic diagram of the sealing rubber cylinder mechanism in the present invention; Figure 4 It is a partial enlarged schematic diagram of the second friction slip mechanism and the third friction slip mechanism in the present invention; Figure 5 It is a partial enlarged schematic diagram of the piston mechanism in the present invention; Figure 6 is a flow chart of Example 2 of the present invention; In the figure: 1-center tube, 2-cone one, 3-friction slip, 4-cone two, 5-cone two locating pin, 6-rubber cylinder protection ring, 7-side rubber cylinder, 8-middle rubber cylinder, 9-inner sealing ring, 10-sealing ring, 11-cone three, 12-cone three locating pin, 13-locating sleeve one, 14-cone four, 15-cone four locating pin, 16-locating sleeve two, 17-cone five, 18-release pin one, 19-release pin two, 20-locking sleeve, 21-locking ring, 22-anti-rotation pin, 23-safety pin, 24-piston cylinder, 25-seal ring one, 26-seal ring two. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0028] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example 1

[0029] A friction type open hole suspension packer comprises a central pipe 1, on which a sealing rubber cylinder mechanism, a piston mechanism and a friction type slip mechanism are sleeved, each mechanism is sleeved on the central pipe in sequence, and each adjacent mechanism / structure on the central pipe abuts or is embedded with each other, wherein: The sealing rubber cylinder mechanism comprises a sealing middle rubber cylinder structure and sealing side rubber cylinder structures arranged on both sides of the sealing structure; The piston mechanism includes a piston structure and a piston cylinder structure. By locking the position of the piston mechanism, the sealing rubber cylinder mechanism can be kept in a set state; The friction slip mechanism, the number of which is not less than three, is respectively arranged on both sides of the sealing rubber tube mechanism. The friction slip mechanism comprises a friction slip structure and a cone structure arranged on both sides of the friction slip structure. The outer surface of the friction slip structure is provided with an anchor groove structure. Figure 1 As shown, more than three groups of friction slip mechanisms are opened from left to right in sequence. The progressive design greatly reduces the resistance of the slips during movement. The modular slip design can increase the number of friction slips according to the pressure level of the packer.

[0030] Furthermore, in this embodiment, it can be considered that at least two sets of friction slip mechanisms are successively mounted on the central tube 1 between the sealing rubber cylinder mechanism and the piston mechanism, and at least one set of friction slip mechanisms is successively mounted on the central tube 1 on the side of the sealing rubber cylinder mechanism away from the piston mechanism. Figure 1 As shown, two groups of friction-type cava mechanisms are successively mounted on the central tube 1 between the sealing rubber cylinder mechanism and the piston mechanism, and one group of friction-type cava mechanisms is mounted on the central tube 1 on the side of the sealing rubber cylinder mechanism away from the piston mechanism. The three groups of friction-type cava mechanisms are successively referred to as the first, second, and third friction-type cava mechanisms from left to right.

[0031] Furthermore, in this embodiment, it can also be considered that the sealed middle rubber tube structure includes a middle rubber tube 8 which is sleeved on the outside of the central tube 1, an inner sealing ring 9 formed inside the middle rubber tube 8, and a sealing ring 10 which is sleeved on the outside of the central tube 1 and located inside the inner sealing ring 9, and the two ends of the middle rubber tube 8 are protruded to form a truncated cone protrusion.

[0032] Furthermore, in the present embodiment, it can also be considered that the sealing edge rubber cylinder structure includes a edge rubber cylinder 7 which is sleeved on the outside of the central tube 1, and the end of the edge rubber cylinder 7 facing the middle rubber cylinder 8 is formed with an inner cylindrical surface which cooperates with the cylindrical surface of the middle rubber cylinder 8, so that the middle rubber cylinder 8 is accommodated in the annular space surrounded by the two edge rubber cylinders 7; the end of the side rubber cylinder 7 facing away from the middle rubber cylinder 8 is convexly formed with a cylindrical surface and a rubber cylinder protection ring 6 which is adapted to its shape is pressed on it.

[0033] Furthermore, in this embodiment, the friction slip structure includes a friction slip 3 sleeved on the outside of the central tube 1; the cone structure includes a cone sleeved on the outside of the central tube 1, and the inner walls at both ends of the friction slip 3 are respectively formed with inner cone surfaces that cooperate with the cone surface of the cone, so that the friction slip 3 is accommodated in the annular space surrounded by the two cones. Figure 1 As shown, the first friction slip mechanism located on the outermost side includes a friction slip 3, cone 1 2 and cone 2 4 located on both sides thereof, and cone 2 4 is fixed to the center tube 1 through cone 2 positioning pin 5. The second friction slip mechanism includes a friction slip 3, cone 3 11 and cone 4 14 located on both sides thereof, cone 3 11 is fixed to the center tube 1 through cone 3 positioning pin 12, and cone 4 14 is fixed to the positioning sleeve through cone 4 positioning pin 15. The third friction slip mechanism includes a friction slip 3, cone 4 14 and cone 5 17 located on both sides thereof, cone 4 14 is fixed to the positioning sleeve through cone 4 positioning pin 15, and cone 5 17 is fixed to the positioning sleeve and the center tube 1 through release pin 1 18 and release pin 2 19, respectively.

[0034] Furthermore, it can also be considered in this embodiment that the friction slip 3 is a cylindrical structure made of a soft metal material with a certain hardness, and the anchoring groove structure includes a plurality of annular grooves arranged on the outer surface of the friction slip. The friction slip is made of a soft metal material with a certain hardness, and its hardness is similar to that of the rock. Under the action of the piston force, the slip generates a radial force, interacts with the formation rock in the open hole section, generates friction, and achieves anchoring. The slip surface has a groove design, which enters into the formation rock and generates greater friction resistance. The cylindrical structure design, under the action of the radial force, is in full contact with the rock at 360 degrees.

[0035] Furthermore, in the present embodiment, it is also possible to consider that a positioning sleeve is also sleeved on the central tube 1 located between the sealing rubber tube mechanism and the piston mechanism, and the positioning sleeve includes a positioning sleeve 13 and a positioning sleeve 2 16, the second friction type cava mechanism is sleeved on the outside of the positioning sleeve 13, and the third friction type cava mechanism is sleeved on the outside of the positioning sleeve 2 16.

[0036] Furthermore, in this embodiment, it can also be considered that the piston structure includes a locking sleeve 20, a locking ring 21 and an anti-rotation pin 22, and the locking sleeve 20 is sleeved on the outside of the central tube 1 through the locking ring 21 and fixed to the central tube 1 through the anti-rotation pin 22.

[0037] Furthermore, it can also be considered in the present embodiment that the piston cylinder structure includes a piston cylinder 24 formed on the outside of the center tube 1, and a semi-enclosed annular space is enclosed between the piston cylinder 24 and the center tube 1, and the locking sleeve 20 is protruded at one end facing the piston cylinder 24 and is formed with a long-side annular protrusion adapted to be embedded in the semi-enclosed annular space, and the long-side annular protrusion of the locking sleeve is sealed and connected to the outside of the center tube 1 and the inside of the piston cylinder 24 through a sealing ring 1 25 and a sealing ring 2 26, respectively, and is fixed to the piston cylinder 24 through a safety pin 23.

[0038] Furthermore, in the present embodiment, it is also possible to consider that a step support structure is provided between the center tube 1 and the outermost friction-type cava mechanism, and the step support structure includes at least two levels of center tube steps formed on the outer wall of the center tube 1 and with gradually decreasing diameters. The inner wall of one cone of the friction-type cava mechanism is recessed inward to form an inner step surface that cooperates with the center tube step, and the other cone is fixed to the center tube 1 by a positioning pin.

[0039] Furthermore, in this embodiment, it can also be considered that a clamping structure is provided between the locking sleeve 20 and the innermost friction slip mechanism. Taking this embodiment as an example, a clamping structure is provided between the locking sleeve 20 and the third friction slip mechanism, and the clamping structure includes: The protrusion is formed as a short side annular protrusion on one end of the locking sleeve 20 facing the friction slip mechanism; The inner cylindrical surface of the cone close to the locking sleeve 20 is concavely formed so that the short-side annular protrusion of the locking sleeve 20 is accommodated in the inner cylindrical surface of the cone.

[0040] Furthermore, in this embodiment, it can also be considered that in the friction slip mechanism other than the friction slip mechanism located at the outermost and innermost sides, the two cones therein are respectively fixed to the central tube 1 by positioning pins; taking this embodiment as an example: In the first friction slip mechanism, the cone 1 2 is in contact with the central tube 1 through the step support structure, and the cone 2 4 is fixed to the central tube 1 through the cone 2 positioning pin 5; In the third friction slip mechanism, the cone five 17 is engaged with the locking sleeve 20 through the engaging structure and is fixed to the positioning sleeve through the release pin, and the cone four 14 is fixed to the positioning sleeve through the cone four positioning pin 15.

[0041] Furthermore, in the present embodiment, it can be considered that in the two adjacent friction slip mechanisms, the two cones close to each other are designed as an integral molding and are fixed to the center tube 1 by a common positioning pin, such as Figure 1 As shown, the second friction slip mechanism and the third friction slip mechanism share the cone body 14 and the cone body 14 positioning pin 15 and are fixed to the positioning sleeve.

[0042] like Figure 1 As shown, cone one 2, friction slip 3, cone two 4, rubber cylinder protection 6, side rubber cylinder 7, middle rubber cylinder 8, inner sealing ring 9, sealing ring 10, side rubber cylinder 7, rubber cylinder protection ring 6, cone three 11, friction slip 3, cone four 14, friction slip 3, cone five 17, locking sleeve 20, piston cylinder 24, each structure is sequentially mounted on the center tube 1 and abut or embed with each other.

[0043] The working principle is as follows: the packer and other pipe strings and tools are put into the well. After reaching the designed position, the oil pipe is pressurized. When the pressure reaches the designed starting pressure, the start safety pin 23 is sheared off under the hydraulic pressure of the piston structure 20, and the piston moves to the left. First, the positioning pin 12 of cone 3 is sheared off. Cone 3 11 pushes the rubber tube protection 6, side rubber tube 7, middle rubber tube 8, inner sealing ring 9, and sealing ring 10 in the sealing rubber tube mechanism to move, and then the positioning pin 5 of cone 2 is sheared off. Cone 2 4 pushes the first friction slip on the far left to open, contact and anchor with the open hole section. Continue to pressurize, the rubber tube contacts with the open hole section, and the annulus is sealed. Continue to increase the pressure and pressurize, the positioning pin 15 of cone 4 is sheared off, the second friction slip opens, and anchors with the open hole section, and continue to pressurize, the third friction slip opens and anchors. After reaching the designed pressure, the locking ring 21 and the locking sleeve 20 are locked with the central pipe 1 by the thorns to achieve sealing and anchoring of the annulus.

[0044] The present invention adopts a friction slip with a friction force greater than the force generated by the pressure acting on the packer. The principle is that the friction slip contacts the rock of the open hole section and generates upward and downward friction forces under the action of the outward radial force of the cone, thereby achieving anchoring between the packer and the open hole section. Example 2

[0045] A method for setting a friction-type open-hole suspension packer comprises the following steps: S1. The packer and other pipe strings and tools are put into the well. After reaching the designed position, the oil pipe is pressurized. When the pressure reaches the designed starting pressure, the safety pin 23 is sheared off under the hydraulic action of the piston structure, and the piston structure moves toward the friction slip mechanism and the sealing rubber cylinder mechanism; S2, first cut off the positioning pin closest to the inner side of the sealing rubber tube mechanism, and the cone closest to the inner side of the sealing rubber tube mechanism pushes the rubber tube protection ring 6, the side rubber tube 7, the middle rubber tube 8, the inner sealing ring 9 and the sealing ring 10 in the sealing rubber tube mechanism to move, and then cut off the positioning pin closest to the outer side of the sealing rubber tube mechanism, and the cone closest to the outer side of the sealing rubber tube mechanism pushes the outermost first friction slip mechanism to open, contact with the open hole section and anchor; S3, continue to pressurize, each rubber cylinder in the sealing rubber cylinder mechanism contacts with the open hole section to achieve annular space sealing; S4, continue to increase the pressure to press, the second friction slip mechanism arranged from the outside to the inside opens and anchors with the open hole section, continue to press, the third friction slip mechanism opens and anchors, and so on, after multiple presses, until the last friction slip mechanism opens and anchors; S5. After the design pressure is reached, the locking sleeve 20, the locking ring and the central pipe 1 in the sealing structure are locked by means of thorns to achieve sealing and anchoring of the annulus.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A friction type open hole suspension packer, comprising a central pipe (1), characterized in that: The central tube (1) is provided with: The sealing rubber cylinder mechanism comprises a sealing middle rubber cylinder structure and sealing side rubber cylinder structures arranged on both sides of the sealing structure; The piston mechanism includes a piston structure and a piston cylinder structure. By locking the position of the piston mechanism, the sealing rubber cylinder mechanism can be kept in a set state; The friction slip mechanism has a number of not less than three groups, which are respectively arranged on both sides of the sealing rubber cylinder mechanism, and the friction slip mechanism comprises a friction slip structure and a cone structure arranged on both sides of the friction slip structure, and the outer surface of the friction slip structure is provided with an anchoring groove structure; The above-mentioned various mechanisms are sleeved on the central tube (1) in order, and the adjacent structures on the central tube (1) are abutted or embedded with each other.

2. A friction type open hole suspension packer according to claim 1, characterized in that: At least two groups of friction slip mechanisms are successively mounted on the central tube (1) between the sealing rubber cylinder mechanism and the piston mechanism, and at least one group of friction slip mechanisms is successively mounted on the central tube (1) on the side of the sealing rubber cylinder mechanism away from the piston mechanism.

3. The friction type open hole suspension packer according to claim 1, characterized in that: The sealing middle rubber tube structure comprises a middle rubber tube (8) sleeved on the outside of the central tube (1), an inner sealing ring (9) formed inside the middle rubber tube (8), and a sealing ring (10) sleeved on the outside of the central tube (1) and located inside the inner sealing ring (9); The sealing side rubber cylinder structure comprises a side rubber cylinder (7) sleeved on the outside of the central tube (1); one end of the side rubber cylinder (7) facing the middle rubber cylinder (8) is formed with an inner circular table surface that cooperates with the circular table surface of the middle rubber cylinder (8); one end of the side rubber cylinder (7) facing away from the middle rubber cylinder (8) is formed with a convex circular table surface and a rubber cylinder protection ring (6) matching the shape thereof is pressed on the side rubber cylinder (7).

4. The friction type open hole suspension packer according to claim 1, characterized in that: The friction slip structure comprises a friction slip (3) sleeved on the outside of a central tube (1); the cone structure comprises a cone sleeved on the outside of the central tube (1), and inner walls at both ends of the friction slip (3) are respectively formed with inner cone surfaces that cooperate with the cone surfaces of the cone.

5. A friction type open hole suspension packer according to claim 4, characterized in that: The friction slip (3) is a cylindrical structure made of a soft metal material with a certain hardness, and the anchor groove structure comprises a plurality of annular grooves arranged on the outer surface of the friction slip.

6. The friction type open hole suspension packer according to claim 1, characterized in that: The piston structure comprises a locking sleeve (20), a locking ring (21) and an anti-rotation pin (22); the locking sleeve (20) is sleeved on the outer side of the central tube (1) via the locking ring (21) and is fixed to the central tube (1) via the anti-rotation pin (22); The piston cylinder structure comprises a piston cylinder (24) formed on the outside of a central tube (1), a semi-enclosed annular space being enclosed between the piston cylinder (24) and the central tube (1), and a long-side annular protrusion being formed on one end of the locking sleeve (20) facing the piston cylinder (24) and adapted to be embedded in the semi-enclosed annular space, the long-side annular protrusion of the locking sleeve being sealedly connected to the piston cylinder (24) and the central tube (1) via a sealing ring, and being fixed to the piston cylinder (24) via a safety pin (23).

7. The friction type open hole suspension packer according to claim 1, characterized in that: A positioning sleeve is also sleeved on the central tube (1) between the sealing rubber cylinder mechanism and the piston mechanism, and a friction slip mechanism between the sealing rubber cylinder mechanism and the piston mechanism is sleeved on the outside of the positioning sleeve.

8. The friction type open hole suspension packer according to claim 7, characterized in that: A step support structure is provided between the central tube (1) and the friction slip mechanism located at the outermost side, and a clamping structure is provided between the locking sleeve (20) and the friction slip mechanism located at the innermost side.

9. A friction type open hole suspension packer according to claim 8, characterized in that: In the friction slip mechanisms other than the friction slip mechanisms located at the outermost and innermost sides, the two cones are fixed to the central tube (1) via positioning pins respectively; In the outermost friction slip mechanism, one cone is in contact with the central tube (1) via a step support structure, and the other cone is fixed to the central tube (1) via a positioning pin; In the friction slip mechanism located at the innermost side, one cone is engaged with the locking sleeve (20) through the engaging structure and is fixed to the positioning sleeve through the release pin, and the other cone is fixed to the positioning sleeve through the positioning pin.

10. A method for setting a friction open hole suspension packer according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. After the packer and other pipe strings and tools are put into the well and reach the designed position, the oil pipe is pressurized. When the pressure reaches the designed starting pressure, the safety pin (23) is cut off under the hydraulic action of the piston structure, and the piston structure moves toward the friction slip mechanism and the sealing rubber cylinder mechanism; S2, firstly cut the positioning pin closest to the inner side of the sealing rubber tube mechanism, and the cone closest to the inner side of the sealing rubber tube mechanism pushes the rubber tube protection ring (6), the side rubber tube (7), the middle rubber tube (8), the inner sealing ring (9) and the sealing ring (10) in the sealing rubber tube mechanism to move, and then cut the positioning pin closest to the outer side of the sealing rubber tube mechanism, and the cone closest to the outer side of the sealing rubber tube mechanism pushes the outermost first friction slip mechanism to open, contact with the open hole section and anchor; S3, continue to pressurize, each rubber cylinder in the sealing rubber cylinder mechanism contacts with the open hole section to achieve annular space sealing; S4, continue to increase the pressure to press, the second friction slip mechanism arranged from the outside to the inside opens and anchors with the open hole section, continue to press, the third friction slip mechanism opens and anchors, and so on, after multiple presses, until the last friction slip mechanism opens and anchors; S5. After the design pressure is reached, the locking sleeve (20), the locking ring and the center pipe (1) in the sealing structure are locked by means of the thorns to achieve sealing and anchoring of the annulus.

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