Sealing supporting mechanism

Abstract

The invention provides a sealing supporting mechanism which comprises a fixing sleeve, a center pipe in butt joint with the end of the fixing sleeve, a push block assembly slidably connected to the outer wall of the center pipe in a sleeving mode and a rubber sleeve piece, the push block assembly is in threaded sleeving connection with the center pipe, and the rubber sleeve piece is located between the fixing sleeve and the push block assembly. The rubber sleeve piece is in a stretched state and is clamped between the fixing sleeve and the push block assembly; and when the push block assembly is located at the second position, the push block assembly and the fixing sleeve jointly extrude the rubber sleeve part, and the rubber sleeve part deforms to block the inner cavity of the oil casing. On the basis that the rubber sleeve piece can deform, the mechanism is kept in a small-outer-diameter state in the descending process through extrusion of the fixing sleeve and the center pipe, and blocking of an inner cavity of a large-deformation oil casing or a large-diameter oil casing can be achieved; the problem that the expected purpose cannot be achieved due to serious deformation of the casing pipe caused by terrain, geology and other problems in the existing oil and gas deep development process is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil production equipment, and in particular relates to a sealing support mechanism. Background Art

[0002] In the current fracturing construction process, bridge plugs are usually lowered and sealed at a pre-set position in the wellbore to achieve segmented isolation of the bottom hole casing, so as to ensure the effective construction of segmented fracturing of oil and gas wells. In the face of well conditions with large casing deformation, bridge plugs of various specifications or bridge plugs with relatively large diameter differences are usually used to meet the narrow passages after the casing deformation, so as to achieve smooth lowering of the wellbore and avoid the problem of obstruction in the lowering of the bridge plug.

[0003] The existing soluble bridge plug mainly supports the deformation of the rubber tube through a bowl-shaped protection mechanism or a C-shaped ring protection mechanism. Although the support height can be adjusted by adjusting the width of the bowl-shaped mechanism, the reduction in overall specifications and diameter makes the pressure-bearing capacity of the bridge plug relatively poor when facing a relatively large annulus diameter, which seriously affects the smooth progress of well operations in wells with large casing deformation. Summary of the invention

[0004] In view of the above problems, the present invention proposes a sealing support mechanism, comprising: a fixed sleeve, a central tube connected with the end of the fixed sleeve, a push block assembly and a rubber sleeve member slidably sleeved on the outer wall of the central tube;

[0005] The push block assembly is threadedly sleeved with the center tube, the rubber sleeve is located between the fixed sleeve and the push block assembly, the outer diameter of the fixed sleeve is larger than the outer diameter of the center tube, and when the push block assembly is in the first position, the rubber sleeve is in a stretched state and is clamped between the fixed sleeve and the push block assembly;

[0006] When the push block assembly is in the second position, the push block assembly and the fixed sleeve jointly squeeze the rubber cylinder component, so that the rubber cylinder component is in a compressed state, and then deforms to form abutment with the inner wall of the oil casing, thereby sealing the inner cavity of the oil casing.

[0007] Furthermore, the push block assembly includes an active ring and a positioning ring, both of which are ring-shaped, and the inner cavity of the active ring includes a first through hole and a second through hole close to one side of the rubber cylinder, and the inner diameter of the second through hole is greater than the inner diameter of the first through hole;

[0008] The outer ring side wall of the positioning ring is threadedly sleeved with the inner wall of the second through hole of the active ring, the inner ring side wall of the positioning ring is threadedly sleeved with the outer wall of the center tube, and the tooth height of the outer ring side wall of the positioning ring is greater than the tooth height of the inner ring side wall, and the side wall of the positioning ring is provided with a through groove parallel to the axis of the center tube.

[0009] Furthermore, it also includes a support component, and the support component is clamped and installed between the rubber cylinder component, the push block component, and the fixed sleeve;

[0010] The support assembly comprises a first guide ring, a first support block, and a first half-enclosing ring which are slidably sleeved on the outer wall of the central tube, and a plurality of first support blocks are arranged in a circumferential array between the first guide ring and the first half-enclosing ring;

[0011] One ends of several first support blocks are rotatably hinged with the first half-ring, and the other ends of several first support blocks are provided with guide grooves. The end of the first guide ring facing the first support block is provided with several guide protrusions slidably connected with the guide grooves, so that when the rubber cylinder is in a compressed state, the first support block rotates in a direction away from the central tube with the hinged connection point between the first support block and the first half-ring as the center.

[0012] Furthermore, a second guide ring, a second support block, and a second half-enclosing ring are slidably sleeved on the outer wall of the central tube, and a plurality of second support blocks are arranged in a circular array between the second guide ring and the second half-enclosing ring;

[0013] One end of a plurality of second support blocks is rotatably hinged with the second half-envelope ring, the other end of the second support blocks is provided with a guide slot, and one end of the second guide ring facing the second support block is provided with a plurality of guide protrusions slidably connected with the guide slot;

[0014] The second guide ring, the second support block and the second half-enclosing ring are respectively arranged in a left-right symmetrical manner corresponding to the first guide ring, the first support block and the first half-enclosing ring, so that when the rubber cylinder is in a compressed state, the second support block rotates in a direction away from the central tube with the hinged connection point between the second support block and the second half-enclosing ring as the center.

[0015] Furthermore, the support assembly also includes a hoop ring, and the outer walls of the first support block and the second support block are both provided with outer ring grooves, and the hoop rings are sleeved in the outer ring grooves.

[0016] Furthermore, the guide protrusion includes an inclined surface portion and a straight surface portion arranged in an inner and outer circle, and a rounded transition is adopted between the inclined surface portion and the straight surface portion.

[0017] Furthermore, it also includes a push ring, a first push block, a second push block, and a hoop ring which are slidably sleeved on the outer wall of the central tube;

[0018] The outer ring side walls of the first push block and the second push block are both provided with outer ring grooves, and hoop rings are installed in the outer ring grooves;

[0019] One end of the push ring abuts against the push block assembly, the other end of the push ring is connected to one end of the first push block through a slide rail, and the other end of the first push block is slidably connected to a first guide ring nearby. When the push block assembly is in the second position, the push ring pushes the first push block to move along the slide rail until the first push block abuts against a side wall of a first support block nearby.

[0020] The connecting end of the fixed sleeve and the center tube is connected to one end of the second push block through a slide rail, and the other end of the second push block is slidably connected to the adjacent first guide ring. When the push block assembly is in the second position, the fixed sleeve pushes the second push block to move along the slide rail until the end of the second push block is in contact with the adjacent first support block side wall.

[0021] Furthermore, a plurality of inner ring grooves are formed on the inner ring side wall of the rubber cylinder.

[0022] Furthermore, the sealing support mechanism is made of soluble material.

[0023] Furthermore, the outer diameters of the fixed sleeve and the central tube maintain a predetermined difference, so that when the push block assembly is in the first position, the outer walls of the push block assembly, the rubber cylinder component, and the support assembly are all coplanar with the outer wall of the fixed sleeve.

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

[0025] 1. In the present invention, on the basis that the rubber sleeve can be deformed, the deformation direction of the rubber sleeve is limited by the mutual extrusion of the fixed sleeve and the center pipe with a difference in outer diameter, so that the mechanism can maintain a small outer diameter during the lowering process, and can smoothly reach the planned fracturing position within a relatively small diameter range, and then form a large outer diameter through extrusion, thereby realizing the sealing of the inner cavity of the oil casing with large deformation or large diameter, and realizing the sealing operation of the large diameter oil casing by the small-sized rubber sleeve, which meets the problem that the serious deformation of the casing caused by terrain, geology and other problems in the current in-depth development of oil and gas cannot achieve the expected purpose.

[0026] 2. At the same time, through the support components on both sides of the rubber cylinder, when subjected to axial force, the support blocks of the left and right support components will rotate outward with the hinge points with the half-ring as the fulcrum, forming a blocking surface that is perpendicular to the center pipe, so that the inner wall of the oil casing, the outer wall of the center pipe and the first support blocks and the second support blocks on both sides jointly form a relatively sealed annular space, so that the rubber cylinder can obtain effective support in the annular space, and under the action of the first push block and the second push block, effective supporting force is provided to the two groups of support components, thereby increasing the force of the rubber cylinder to squeeze the inner wall of the oil casing after deformation, increasing the compression force of the rubber cylinder, and increasing the tightness of the rubber cylinder to seal the inner wall of the oil casing.

[0027] 3. Under the action of the hoop ring, the deformation degree of the rubber cylinder, the relative position of the push block assembly and the center pipe, the rotation angle of the support block, and the displacement of the first push block and the second push block are synchronized, which greatly meets the use scenarios of oil casing with different inner diameters and realizes efficient oil production under complex terrain conditions.

[0028] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 The schematic diagram of the use state of the sealing support mechanism in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0031] Figure 2 The schematic diagram of the use state of the sealing support mechanism in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0032] Figure 3 The schematic diagram of the use state of the sealing support mechanism in the embodiment of the present invention is shown in FIG. Figure 1 Partial enlarged image;

[0033] Figure 4 The schematic diagram of the use state of the sealing support mechanism in the embodiment of the present invention is shown in FIG. Figure 2 Partial enlarged image;

[0034] Figure 5 A schematic diagram of the structure of a first guide ring in an embodiment of the present invention is shown;

[0035] Figure 6 A schematic diagram of the structure of a first supporting block in an embodiment of the present invention is shown;

[0036] Figure 7 It shows a schematic structural diagram of the first half enveloping ring in an embodiment of the present invention;

[0037] Figure 8 A schematic diagram of the combined structure of the first half enveloping ring and the second half enveloping ring in an embodiment of the present invention is shown;

[0038] Fig. 9 A schematic diagram of the structure of a push ring in an embodiment of the present invention is shown;

[0039] Fig.10 A schematic diagram of the structure of a first push block in an embodiment of the present invention is shown;

[0040] Fig.11A schematic diagram of the structure of an active ring in an embodiment of the present invention is shown;

[0041] Fig.12 A schematic cross-sectional view of the structure of a positioning ring in an embodiment of the present invention is shown;

[0042] Fig.13 A schematic side view of the structure of a positioning ring in an embodiment of the present invention is shown.

[0043] In the figure, 1-fixed sleeve, 2-center tube, 3-rubber cylinder, 4-active ring, 5-positioning ring, 6-first guide ring, 7-first support block, 8-first half wrapping ring, 9-guide protrusion, 901-inclined portion, 902-straight portion, 10-guide slide groove, 11-second guide ring, 12-second support block, 13-second half wrapping ring, 14-hoop ring, 15-push ring, 16-first push block, 17 second push block, 18-inner ring groove, 19-oil casing. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0045] The present invention provides a sealing support mechanism. Figure 1 The schematic diagram shows the use state of the sealing support mechanism in the embodiment of the present invention. Figure 1 , Figure 1 The sealing support mechanism includes a fixed sleeve 1, a central tube 2 connected to the end of the fixed sleeve 1, a push block assembly slidably sleeved on the outer wall of the central tube 2, and a rubber cylinder 3;

[0046] The push block assembly is threadedly sleeved with the center tube 2, and the rubber tube member 3 is located between the fixed sleeve 1 and the push block assembly. The outer diameter of the fixed sleeve 1 is larger than the outer diameter of the center tube 2. When the push block assembly is in the first position, the rubber tube member 3 is in a stretched state and is clamped between the fixed sleeve 1 and the push block assembly.

[0047] When the push block assembly is in the second position, the push block assembly and the fixing sleeve 1 jointly squeeze the rubber cylinder member 3 , so that the rubber cylinder member 3 is in a compressed state, and then deformed to form abutment with the inner wall of the oil casing 19 .

[0048] refer to Figure 1 and Figure 3 When the push block assembly is in the first position, the rubber cylinder member 3 is in a stretched state, and the rubber cylinder member 3 is clamped by the push block assembly and the fixed sleeve 1 on both sides, and their respective positions are limited; refer to Figure 2 and Figure 4 When the push block assembly is driven to change the position of the push block assembly relative to the center tube 2, the push block assembly and the rubber cylinder 3 both move toward the side of the fixed sleeve 1, and under the clamping force of the push block assembly and the fixed sleeve 1, the rubber cylinder 3 is deformed, that is, the two ends of the rubber cylinder 3 move toward the middle, and at the same time, the middle part of the rubber cylinder 3 extends outward until it abuts against the inner wall of the oil casing 19, thereby achieving the blocking of the inner cavity channel of the oil casing 19.

[0049] On the basis that the rubber sleeve 3 can be deformed, the deformation direction of the rubber sleeve 3 is limited by the mutual extrusion of the fixed sleeve 1 and the central tube 2 with a difference in outer diameter, so that the mechanism can maintain a small outer diameter during the lowering process, and can smoothly reach the planned fracturing position within a relatively small diameter range. When facing the severely deformed oil casing 19, it avoids the problem that the mechanism is stuck in the middle or the casing wall is touched, resulting in premature sealing and failure to reach the planned sealing position; then a large outer diameter is formed by extrusion, and then the inner cavity of the greatly deformed oil casing 19 or the large-diameter oil casing 19 is sealed, and the sealing operation of the small-sized rubber sleeve 3 on the large-diameter oil casing 19 is realized, which solves the problem that conventional bridge plugs cannot achieve in the process of oil and gas resource exploitation and improves construction efficiency.

[0050] refer to Fig.11 , Fig.12 and Fig.13 The push block assembly includes an active ring 4 and a positioning ring 5. The active ring 4 and the positioning ring 5 are both annular. The inner cavity of the active ring 4 adopts a step hole structure. The inner cavity of the active ring 4 includes a first through hole and a second through hole close to the side of the rubber cylinder 3. The inner diameter of the second through hole is larger than the inner diameter of the first through hole. The inner wall of the second through hole is provided with a serrated thread.

[0051] Correspondingly, the outer ring side wall and the inner ring side wall of the positioning ring 5 are both provided with serrated threads, wherein the outer ring side wall of the positioning ring 5 is threadedly sleeved with the inner wall of the second through hole of the active ring 4, the inner ring side wall of the positioning ring 5 is threadedly sleeved with the outer wall of the center tube 2, and the tooth height of the outer ring side wall of the positioning ring 5 is greater than the tooth height of the inner ring side wall, and the side wall of the positioning ring 5 is provided with a through groove parallel to the axial centerline of the center tube 2, which is convenient for changing the inner diameter of the positioning ring 5.

[0052] When force is applied to the active ring 4, on the basis that the side wall of the first through hole abuts against the positioning ring 5 and the tooth height of the outer ring side wall of the positioning ring 5 is greater than the tooth height of the inner ring side wall, the inner diameter of the positioning ring 5 is repeatedly enlarged or reduced, and moves along the center tube 2 toward the side of the fixed sleeve 1. When the active ring 4 moves to the specified position, the position can be autonomously limited under the action of the serrated thread, thereby avoiding the situation where the push block assembly is autonomously reset.

[0053] Specifically, refer to Figure 1 and Figure 3, and also includes a support component, and the support component is clamped and installed between the rubber cylinder component 3 and the push block component and the fixed sleeve 1;

[0054] The support assembly includes a first guide ring 6, a first support block 7, and a first half-enclosing ring 8 which are slidably sleeved on the outer wall of the central tube 2, and the first support block 7 is arranged between the first guide ring 6 and the first half-enclosing ring 8;

[0055] One ends of several first support blocks 7 are rotatably hinged with the first half-enclosing ring 8, and the other ends of several first support blocks 7 are provided with guide grooves 10. The end of the first guide ring 6 facing the first support block 7 is provided with several guide protrusions 9 slidably connected with the guide grooves 10, so that when the rubber cylinder 3 is in a compressed state, the first support block 7 rotates in a direction away from the central tube 2 with the hinged connection point between the first support block 7 and the first half-enclosing ring 8 as the center of the circle.

[0056] It should be noted that the reference Figure 7 The first half enveloping ring 8 in the present application comprises a ring body portion, and a plurality of protrusions are arranged in a circular array on the outer ring side wall of the ring body portion, and semi-cylindrical blind holes are provided on the adjacent side walls of adjacent protrusions, so that a receiving groove body for rotating and hingedly connecting the rotating body portion of the first support block 7 is formed between the adjacent protrusions, and the first support block 7 rotates with the axis of the semi-cylindrical blind hole as the center direction of the circle.

[0057] refer to Figure 6 The first support block 7 includes a main body and a swivel portion connected to the main body. The cross section of the main body adopts an inverted right-angled trapezoidal structure. The inclined surface and the lower bottom surface of the main body are provided with mutually connected guide grooves 10, and the turning point between the inclined surface and the lower bottom surface adopts a rounded transition. The swivel portion is located on one side of the main body, and the cross section of the swivel portion adopts a cylindrical structure.

[0058] Specifically, refer to Figure 5 The guide protrusion 9 includes an inclined surface portion 901 and a straight surface portion 902 arranged in an inner and outer circle, and a rounded transition is adopted between the inclined surface portion 901 and the straight surface portion 902; wherein, when the rubber cylinder component 3 is in an extended state, the inclined surface portion 901 fits with the inclined surface of the main body, and when the rubber cylinder component 3 is in a compressed state, the straight surface portion 902 is used to form an abutment with the lower bottom surface of the main body, and on the basis of supporting the main body, the first support block 7 is guided for rotational movement.

[0059] Corresponding, reference Figure 3 The support assembly also includes a second guide ring 11, a second support block 12, and a second half ring 13 which are slidably sleeved on the outer wall of the central tube 2;

[0060] One end of a plurality of second support blocks 12 is rotatably hinged to the second half-envelope ring 13, and the other end of the second support block 12 is provided with a guide slot 10 with an inner cone structure, and one end of the second guide ring 11 facing the second support block 12 is provided with a plurality of guide protrusions 9 slidably connected to the guide slot 10;

[0061] The second guide ring 11, the second support block 12, and the second half-enclosing ring 13 are respectively arranged in a left-right symmetrical manner corresponding to the first guide ring 6, the first support block 7, and the first half-enclosing ring 8, so that when the rubber cylinder 3 is in a compressed state, the second support block 12 rotates in a direction away from the central tube 2 with the hinged connection point between the second support block 12 and the second half-enclosing ring 13 as the center.

[0062] The second guide ring 11, the second support block 12, and the second half-enclosing ring 13 respectively correspond to the first guide ring 6, the first support block 7, and the first half-enclosing ring 8 in the same structure. The second half-enclosing ring 13 and the first half-enclosing ring 8 are staggered with the storage grooves of the swivel part used for rotating and hingedly connecting the first support block 7 and the second support block 12. When the first support blocks 7 and the second support blocks 12 have completed the rotation, the first support blocks 7 and the second support blocks 12 on the same side will form two adjacent first blocking surfaces and second blocking surfaces on one side of the rubber cylinder part 3, but there will be notches arranged in a circumferential array on the first blocking surface and the second blocking surface. Through the staggered arrangement of the storage grooves, the notches on the first blocking surface and the second blocking surface are staggered, thereby forming a perfect blocking surface, thereby improving the blocking effect on the rubber cylinder part 3.

[0063] During the movement of the push block assembly from the first position to the second position, the first support block 7 and the second support block 12 in symmetrical positions rotate synchronously. When the push block assembly is in the second position, combined with the description of the above-mentioned inverted right-angled trapezoidal structure, the upper bottom surfaces of the first support block 7 and the second support block 12 form a common blocking surface, and the blocking surface is perpendicular to the center pipe 2. The free ends of the first support block 7 and the second support block 12 will abut against the inner wall of the oil casing 19. The inner wall of the oil casing 19, the outer wall of the center pipe 2, and the first support blocks 7 and the second support blocks 12 on both sides will jointly form a relatively sealed annular space for directly limiting the deformation space of the rubber cylinder 3.

[0064] In addition, the support assembly also includes a hoop ring 14, which is made of a soluble rubber ring with a certain elasticity and can be dissolved in solutions of different temperatures, with very little residue particle size and quality; the outer walls of the first support block 7 and the second support block 12 (the upper bottom surface mentioned above) are both provided with outer ring grooves, and the outer ring grooves are both sleeved with hoop rings 14, and the hoop ring 14 is used to provide the first support block 7 and the second support block 12 with a force in the direction of the axis of the central tube 2, which is balanced with the thrust of the first support block 7 and the second support block 12 to ensure the stability of the first support block 7 and the second support block 12 during the outward rotation movement, thereby making the position of the push block assembly on the central tube 2 synchronously associated with the rotation angle of the first support block 7 and the second support block 12, so as to facilitate the precise control of the rotation angle of the first support block 7 and the second support block 12, and at the same time, prevent the first support block 7 and the second support block 12 from disintegrating during the lowering process of the device.

[0065] refer to Fig. 9 and Fig.10 In order to further improve the position stability of the first support blocks 7 on both sides after rotation, a push ring 15, a first push block 16, a second push block 17 and a hoop 14 are also slidably sleeved on the outer wall of the central tube 2, wherein the first push block 16 and the second push block 17 are symmetrically arranged on both sides;

[0066] One end of the push ring 15 abuts against the push block assembly, and the other end of the push ring 15 and the connecting end of the fixed sleeve 1 and the center tube 2 are provided with a plurality of conical slide rails arranged in a circular array around the axis of the center tube 2. Correspondingly, one end of the first push block 16 facing the push ring 15 and one end of the second push block 17 facing the fixed sleeve 1 are also provided with a plurality of conical grooves arranged in a circular array around the axis of the center tube 2. Correspondingly, the number of conical grooves and conical slide rails can be set to 8-24, and the angle can be set to 20°-70°.

[0067] exist Fig. 9 In the illustrated embodiment, the number of the conical grooves and the conical slide rails is 16, and the angle is set to 70°. A plurality of conical slide rails and a plurality of conical grooves correspond to each other to form a slide rail connection, so that the other end of the push ring 15 and the connecting end of the fixed sleeve 1 and the central tube 2 are respectively connected to the first push block 16 and the second push block 17 through the slide rails in a one-to-one correspondence;

[0068] The other ends of the first push block 16 and the second push block 17 both adopt an inner cone structure, and the corresponding first guide rings 6 on both sides adopt an outer cone structure, so that the other ends of the first push block 16 and the second push block 17 are respectively slidably connected to the first guide rings 6 on both sides in a one-to-one correspondence;

[0069] The outer ring side walls of the first push block 16 and the second push block 17 are both provided with outer ring grooves, and the hoop rings 14 are installed in the outer ring grooves;

[0070] When the push block assembly is in the second position, the push ring 15 pushes the first push block 16 to move along the slide rails of the push ring 15 and the first push block 16, and the first push block 16 and the inner conical side wall of the adjacent first guide ring 6, until the first push block 16 abuts against the side wall of the adjacent first support block 7;

[0071] At the same time, the fixed sleeve 1 pushes the second push block 17 to move along the sliding rails of the fixed sleeve 1 and the second push block 17, and the second push block 17 and the inner conical side wall of the adjacent first guide ring 6, until the end of the second push block 17 abuts against the adjacent side wall of the first support block 7, thereby supporting the first support block 7.

[0072] refer to Figure 1 A plurality of inner ring grooves 18 are provided on the inner ring side wall of the rubber cylinder component 3. The cross-section of the inner ring groove 18 can be a V-shaped structure, a circular structure, a rectangular structure, etc., and no limitation is made here. By providing the inner ring grooves 18, when the rubber cylinder component 3 is deformed by the axial force, the inner ring grooves 18 serve as weak positions of the rubber cylinder component 3 and can be used to accommodate the deformation amount of the rubber cylinder component 3, thereby improving the deformation capacity of the rubber cylinder component 3.

[0073] Specifically, the sealing support mechanism is made of soluble materials, wherein the hoop 14 is made of a soluble rubber ring, the rubber sleeve 3 is pressed by soluble rubber, and the remaining materials are made of soluble metals, such as soluble magnesium alloy, soluble aluminum alloy, soluble magnesium aluminum alloy, etc., so that the sealing support mechanism can be in contact with the Cl in the wellbore or formation under different temperature conditions after completing the plugging operation. - After the electrochemical reaction occurs, it dissolves quickly, produces less residue, and releases the blockage inside the oil casing 19.

[0074] Specifically, the outer diameters of the fixed sleeve 1 and the center pipe 2 maintain a predetermined difference. When the push block assembly is in the first position, the outer walls of the push block assembly, the rubber tube member 3, and the support assembly are all coplanar with the outer wall of the fixed sleeve 1, reflecting the integrity of the sealing support mechanism of the present application, making it easier for the sealing support mechanism of the present application to control the overall outer diameter size and improve the smoothness of the mechanism during the lowering operation of the oil casing 19.

[0075] refer to Figure 2 In actual use, when the sealing support mechanism of the present application is lowered into the oil casing 19 and reaches the predetermined position, the center pipe 2 remains stationary. Under the action of axial pressure, the active ring 4 drives the positioning ring 5 to run to the right along the center pipe 2. In this process, on the basis of the axial processing of the positioning ring 5 with a through groove, the positioning ring 5 moves outward or inward along the serrated thread of the outer ring side wall of the center pipe 2, thereby continuously adjusting the diameter. At the same time, on the basis that the tooth height of the outer serrated thread of the positioning ring 5 is greater than the tooth height of the inner serrated thread, it is ensured that the positioning ring 5 will not separate from the active ring 4 and is always located in the inner cavity of the active ring 4.

[0076] When the active ring 4 further pushes the push ring 15, the force is further transmitted to the first push block 16 and the subsequent support components and the rubber cylinder part 3, driving the first push block 16 to move to the right along the central tube 2 and driving the first push block 16 and the second push block 17 to slide outward, driving the first support block 7 and the second support block 12 to rotate outward, and the support components on both sides of the rubber cylinder part 3 have the same movement process.

[0077] The rubber cylinder component 3 will be squeezed and deformed when the first push block 16 and the second push block 17 slide outward and the first support block 7 and the second support block 12 rotate outward. When the first support block 7 and the second support block 12 are arranged vertically with the center pipe 2, the first support block 7 and the second support block 12 are locked in the vertical position. The support components on both sides are combined with the inner wall of the oil casing 19 and the outer wall of the center pipe 2 to form an annular space. The diameter of the rubber cylinder component 3 continues to increase during the deformation process until it finally fills the entire annular space, thereby achieving the blocking of the inner cavity of the oil casing 19.

[0078] In the present invention, on the basis that the rubber sleeve part 3 can be deformed, the deformation direction of the rubber sleeve part 3 is limited by mutual extrusion of the fixed sleeve 1 and the central tube 2 having an outer diameter difference, so that the mechanism can maintain a small outer diameter during the lowering process, and can smoothly reach the planned fracturing position within a relatively small diameter range, and then a large outer diameter is formed by extrusion, thereby realizing the plugging of the inner cavity of the large-deformation oil casing 19 or the large-diameter oil casing 19, and realizing the sealing operation of the small-sized rubber sleeve part 3 on the large-diameter oil casing 19, solving the problem that conventional bridge plugs cannot achieve in the process of oil and gas resource exploitation, and meeting the problem that the serious deformation of the casing caused by terrain, geology and other problems in the current in-depth development of oil and gas cannot achieve the expected purpose.

[0079] At the same time, by designing a set of support components on both sides of the rubber cylinder 3, the two sets of support components are arranged symmetrically, and when subjected to axial force, the support blocks of the left and right support components will rotate outward with the hinge points with the half-ring as the fulcrum, and the upper bottom surfaces of the first support block 7 and the second support block 12 will form a common blocking surface, and the blocking surface is perpendicular to the center pipe 2, and the free ends of the first support block 7 and the second support block 12 will form abutment with the inner wall of the oil casing 19, and the inner wall of the oil casing 19, the outer wall of the center pipe 2 and the first support blocks 7 and the second support blocks 12 on both sides will form a common blocking surface. At the same time, a relatively sealed annular space is formed, so that the rubber cylinder component 3 can obtain effective support in the annular space, and the pressure bearing capacity of a certain local position will not be poor due to lack of support, which will further lead to the problem of loss of sealing in the subsequent pressure bearing process. Under the action of the first push block 16 and the second push block 17, effective supporting force is provided to the two groups of supporting components. The range of the deformation space of the rubber cylinder component 3 is now limited, thereby increasing the force of the rubber cylinder component 3 squeezing the inner wall of the oil casing 19 after the deformation, increasing the compression force of the rubber cylinder component 3, and increasing the tightness of the rubber cylinder component 3 to seal the inner wall of the oil casing 19.

[0080] Moreover, under the action of the hoop ring 14, the deformation degree of the rubber cylinder part 3, the relative position of the push block assembly and the center pipe 2, the rotation angle of the support block, and the displacement of the first push block 16 and the second push block 17 achieve synchronous movement, which greatly meets the use scenarios of oil casing 19 with different inner diameters. The support assembly can support the rubber cylinder part 3 within the entire diameter range, and can achieve the sealing problem of small-sized bridge plugs on large-deformation casing 21. It solves the problem that conventional bridge plugs can only seal casing 21 with a smaller diameter difference, and when encountering deformation of large casing 21, it will cause lowering and getting stuck, and premature sealing. The bottleneck of the existing oil and gas production process is solved, and efficient oil production is achieved under complex terrain conditions.

[0081] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing support mechanism, used for being installed in an oil casing (19) to seal the inner cavity of the oil casing (19), characterized in that: include: A fixed sleeve (1), a central tube (2) butted against the end of the fixed sleeve (1), a push block assembly slidably sleeved on the outer wall of the central tube (2), and a rubber sleeve component (3); The push block assembly is threadedly sleeved with the center tube (2), the rubber sleeve (3) is located between the fixed sleeve (1) and the push block assembly, the outer diameter of the fixed sleeve (1) is larger than the outer diameter of the center tube (2), and when the push block assembly is in the first position, the rubber sleeve (3) is in a stretched state and is clamped between the fixed sleeve (1) and the push block assembly; When the push block assembly is in the second position, the push block assembly and the fixed sleeve (1) jointly squeeze the rubber sleeve component (3), so that the rubber sleeve component (3) is in a compressed state, and then deforms to form abutment with the inner wall of the oil casing (19), thereby sealing the inner cavity of the oil casing (19).

2. The seal support mechanism according to claim 1, characterized in that: The push block assembly comprises an active ring (4) and a positioning ring (5), both of which are ring-shaped, and the inner cavity of the active ring (4) comprises a first through hole and a second through hole close to the side of the rubber cylinder (3), and the inner diameter of the second through hole is greater than the inner diameter of the first through hole; The outer ring side wall of the positioning ring (5) is threadedly sleeved with the inner wall of the second through hole of the active ring (4), and the inner ring side wall of the positioning ring (5) is threadedly sleeved with the outer wall of the center tube (2). The tooth height of the outer ring side wall of the positioning ring (5) is greater than the tooth height of the inner ring side wall. The side wall of the positioning ring (5) is provided with a through groove parallel to the axis of the center tube (2).

3. The seal support mechanism according to claim 1, characterized in that: It also includes a support component, and the support component is clamped and installed between the rubber cylinder component (3), the push block component, and the fixed sleeve (1); The support assembly comprises a first guide ring (6), a first support block (7), and a first half-enclosing ring (8) which are slidably sleeved on the outer wall of the central tube (2); a plurality of first support blocks (7) are arranged in a circular array between the first guide ring (6) and the first half-enclosing ring (8); One end of a plurality of the first support blocks (7) is rotatably hinged to the first half-enclosing ring (8), and the other end of a plurality of the first support blocks (7) is provided with a guide groove (10). The end of the first guide ring (6) facing the first support block (7) is provided with a plurality of guide protrusions (9) slidably connected to the guide groove (10), so that when the rubber cylinder (3) is in a compressed state, the first support block (7) rotates in a direction away from the central tube (2) with the hinge connection point between the first support block (7) and the first half-enclosing ring (8) as the center of the circle.

4. The seal support mechanism according to claim 3, characterized in that: The support assembly further comprises a second guide ring (11) slidably sleeved on the outer wall of the central tube (2), a second support block (12), and a second half-enclosing ring (13); a plurality of second support blocks (12) are arranged in a circular array between the second guide ring (11) and the second half-enclosing ring (13); One end of a plurality of the second support blocks (12) is rotatably hinged to the second half-envelope ring (13), the other end of the second support block (12) is provided with a guide slot (10), and one end of the second guide ring (11) facing the second support block (12) is provided with a plurality of guide protrusions (9) slidably connected to the guide slot (10); The second guide ring (11), the second support block (12) and the second half-enclosing ring (13) are arranged in a left-right symmetrical manner in a one-to-one correspondence with the first guide ring (6), the first support block (7) and the first half-enclosing ring (8), so that when the rubber cylinder (3) is in a compressed state, the second support block (12) rotates in a direction away from the central tube (2) with the hinged connection point between the second support block (12) and the second half-enclosing ring (13) as the center.

5. The seal support mechanism according to claim 4, characterized in that: The support assembly further comprises a hoop ring (14); the outer walls of the first support block (7) and the second support block (12) are both provided with outer ring grooves, and the hoop ring (14) is sleeved in the outer ring grooves.

6. The seal support mechanism according to claim 4, characterized in that: The guide protrusion (9) comprises an inclined surface portion (901) and a straight surface portion (902) arranged in an inner and outer circle, and a rounded transition is adopted between the inclined surface portion (901) and the straight surface portion (902).

7. The seal support mechanism according to claim 4, characterized in that: It also includes a push ring (15) slidably sleeved on the outer wall of the central tube (2), a first push block (16), a second push block (17), and a hoop ring (14); The outer ring side walls of the first push block (16) and the second push block (17) are both provided with outer ring grooves, and hoop rings (14) are installed in the outer ring grooves; One end of the push ring (15) abuts against the push block assembly, and the other end of the push ring (15) is connected to one end of the first push block (16) through a slide rail, and the other end of the first push block (16) is slidably connected to a first guide ring (6) adjacent thereto. When the push block assembly is in the second position, the push ring (15) pushes the first push block (16) to move along the slide rail until the first push block (16) abuts against a side wall of a first support block (7) adjacent thereto; The connection end of the fixed sleeve (1) and the central tube (2) is connected to one end of the second push block (17) through a slide rail, and the other end of the second push block (17) is slidably connected to a first guide ring (6) adjacent thereto. ， When the push block assembly is in the second position, the fixing sleeve (1) pushes the second push block (17) to move along the slide rail until the end of the second push block (17) abuts against the adjacent side wall of the first support block (7).

8. The seal support mechanism according to claim 1, characterized in that: The inner ring side wall of the rubber cylinder (3) is provided with a plurality of inner ring grooves (18).

9. The seal support mechanism according to claim 1, characterized in that: The sealing support mechanism is made of soluble material.

10. The sealing support mechanism according to any one of claims 3 to 9, characterized in that: The outer diameters of the fixed sleeve (1) and the central tube (2) maintain a predetermined difference, so that when the push block assembly is in the first position, the outer walls of the push block assembly, the rubber cylinder (3) and the support assembly are all coplanar with the outer wall of the fixed sleeve (1).

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