A floating hoop and floating shoe for cementing construction

Abstract

The invention discloses a floating hoop and floating shoe for cementing construction, which relates to the technical field of floating hoop and floating shoe devices, and comprises a discharge assembly for being placed at the bottom of a well and pouring cement into the well, wherein a control panel is arranged in the discharge assembly, and the cement output speed can be controlled automatically, and a support assembly for stabilizing the discharge assembly in a well hole is arranged on the discharge assembly, and the support assembly works by the pressure when cement flows through, and a quick-install assembly is arranged on the support assembly, and the quick-install assembly connects the floating hoop and floating shoe together to ensure the stability of the discharge assembly when working, and a centering assembly is arranged on the upper end of the quick-install assembly, and the centering assembly ensures that the device is located at the center of the well hole when working in the well hole, so as to ensure the uniformity of the wall thickness of the well wall, and the invention can automatically reduce the injection speed when injecting cement to prevent the high pressure from damaging the device.

Description

Technical Field

[0001] The invention relates to the technical field of floating collar and floating shoe devices, in particular to a floating collar and floating shoe for cementing construction. Background Art

[0002] Cementing, the operation of lowering casing into the well and injecting cement into the annular space between the wellbore and the casing, is an indispensable and important part of the drilling and completion process. It includes casing lowering and cement injection. Cementing technology is a multidisciplinary comprehensive application technology with the characteristics of systematic, one-time and short time. The main purpose of cementing is to protect and support the casing in the oil and gas well, and to isolate the oil, gas and water formations. In order to prevent the cement from flowing back due to pressure during cement injection, it is necessary to install floating collars and floating shoes at the corresponding positions of the casing.

[0003] The invention patent with the prior art publication number CN105696968B discloses an automatic grouting float collar and float shoe, wherein the upper and lower ends of the float collar body are processed with casing threads, the lower end of the float shoe body is equipped with a guide cap, the inner wall of the body is connected with a stop valve seat, a stop valve is installed below the stop valve seat, the valve body sealing surface is a spherical surface, and the shear mechanism and flow control valve are fixedly sealed on the inner wall of the body by high-strength concrete below the stop valve seat. The flow control valve is located below the shear mechanism, and the flow control valve is a circular ring with a stepped flow guide hole in the middle, which is made of a composite material of nitrile rubber and annular spring. The shear mechanism is divided into an inner and outer sleeve, and there is a pin between the inner and outer sleeves. An alloy ball is placed in the shear mechanism. During drilling operations, although the prior art can solve the problem of cement reflux, it cannot ensure the uniform thickness of the well wall during construction, and cannot be quickly disassembled and assembled. Summary of the invention

[0004] In view of the problems existing in the above-mentioned technologies, the present invention provides a floating collar and a floating shoe for cementing construction.

[0005] The present invention aims at solving the above technical problems and adopts the following technical solutions: a floating hoop and floating shoe for cementing construction, comprising a discharge assembly, a supporting assembly being arranged on the discharge assembly, a quick-install assembly being arranged on the supporting assembly, and a centering assembly being arranged on the quick-install assembly, characterized in that: the discharge assembly comprises a discharge shell, two sets of pressure regulating mechanisms are arranged in the discharge shell, a blocking ball is arranged at the axial position inside the discharge shell through sliding of a sliding rod, wherein the sliding rod and the inner wall of the discharge shell are slidably matched through a star-shaped bracket, a spring is arranged between the spherical part of the blocking ball and the star-shaped bracket, wherein the spring ring It is arranged on the sliding rod; the quick-release assembly includes a connecting tube and a fixed disk, the connecting tube is provided with a rotation locking mechanism, the fixed disk is fixedly provided with a plurality of limit columns, and the limit columns are intermittently fixed to the rotation locking mechanism; the centering assembly includes a supporting shell, one end of the supporting shell is fixedly provided with a diverter disk, the other end of the supporting shell is fixedly connected to the connecting tube, a pressure swing mechanism is arranged in the supporting shell, a narrowing mouth is arranged on the inner wall of the supporting shell, and a blocking ball 2 is overlapped and matched at the narrowing mouth, a baffle plate is arranged on the side of the blocking ball 2, and the baffle plate is fixed on the inner wall of the supporting shell in an overhead manner.

[0006] Furthermore, the discharge housing includes a conical portion, a disc fixedly matched with the bottom edge of the conical portion, and a cylindrical shell fixed with the bottom edge of the conical portion, and the partial pressure adjustment mechanism includes two control shells fixedly mounted on the disc of the discharge housing, and the disc of the discharge housing is provided with two piston holes 1, and pistons 2 are slidably provided in the two piston holes 1;

[0007] Each of the control shells is provided with two coaxial piston holes 2, the axes of the two piston holes 2 are perpendicular to the axis of the discharge shell, pistons 1 are slidably arranged in the two piston holes 2, a sliding space is arranged in the disc of the discharge shell, a control board is slidably sealed in the sliding space, and the sliding space is connected with the inside of the piston hole 1 to form a first chamber, the control shell and the first chamber are filled with hydraulic oil, which is used to transmit the power of the piston 2 to the control board through the hydraulic oil, and drive the control board to move through the hydraulic pressure.

[0008] Furthermore, the axes of the two pistons 1 slidingly arranged in the two piston holes 2 are arranged parallel to the radial direction of the discharge shell, so that one of the pistons 1 is located on a side close to the axis of the discharge shell, and the other piston 1 is located on a side away from the axis of the discharge shell;

[0009] A rack one is fixedly arranged on the piston one located away from the axis of the discharge shell, a rack two is fixedly arranged on the piston two, a gear one is rotatably arranged on the inner wall of the control shell, and the rack one and the rack two are meshed and transmitted through the gear one.

[0010] Further, the rotation locking mechanism includes a limit plate, the limit plate is fixedly connected to the connecting pipe, a rubber plate is fixedly arranged on the end surface of the limit plate, a plurality of rubber plates are fixedly arranged on the rubber plate, all the rubber plates are fixedly matched with the locking ring, the limit plate is a hollow cylinder, wherein the locking ring is rotatably embedded on the inner wall of the hollow cylinder of the limit plate; a plurality of sliding through holes which are plugged and slidably matched with the limit column are opened at the circumferential position on the limit plate along its own axial direction;

[0011] The limiting column is provided with a fixing groove, and the locking ring is engaged with the fixing groove to form an intermittent fixing engagement relationship.

[0012] Furthermore, the locking ring is provided with a first release groove, the limiting plate is provided with a second release groove, the first release groove and the second release groove are arranged in communication with each other, and are used to push the locking ring to rotate in the limiting plate through the second release groove from the outside of the limiting plate, the limiting plate is provided with the same number of grooves as the rubber plate, and the rubber plate swings in the grooves in the limiting plate;

[0013] The limiting plate, the rubber plate and the locking ring are all provided with sliding through holes through which the limiting column can pass, and the limiting plate, the locking ring and the rubber plate are all plug-in and slidingly matched with the limiting column.

[0014] Further, the sliding through holes on the rubber disk and the locking ring are not aligned in an initial state, and the sliding through holes on the limiting disk and the rubber disk are aligned in an initial state.

[0015] Furthermore, the pressure swing mechanism includes a pressure plate, and the support shell is provided with a coaxial concave sliding space at one end of the diverter plate, wherein the pressure plate is slidably matched with the circumferential inner wall of the concave sliding space, and a second spring is fixedly provided between the pressure plate and the bottom end surface of the sliding space;

[0016] A connecting plate is coaxially slidably arranged on the inner wall of the supporting shell, and a plurality of driving columns arranged parallel to the axis of the supporting shell are fixedly mounted on the connecting plate. All the driving columns are arranged in a circular array on the connecting plate, and the driving columns are slidably arranged on the supporting shell in an embedded manner;

[0017] The support shell is provided with a plurality of strip grooves along its radial direction, and all the strip grooves are arranged in a circular equidistant array on the support shell. A connecting rod 1 is arranged in each strip groove, and one end of the connecting rod 1 is movably connected to the connecting plate through a connecting rod 2, and the other end of the connecting rod 1 is movably connected to the support shell through a connecting rod 2;

[0018] The sliding space of the driving column and the concave sliding space where the pressure plate is located form a second chamber.

[0019] Furthermore, the support assembly includes a circulation shell, a plurality of support plates are provided on the circulation shell for radial sliding along the circulation shell, and a spring three is provided between the support plates and the circulation shell.

[0020] Compared with the prior art, the present invention has the following advantages: (1) the present invention can ensure uniform thickness of the well wall during cement pouring by means of the centering assembly and the supporting assembly; (2) the present invention can automatically reduce the injection speed during cement injection by means of the discharging assembly to prevent damage to the device caused by high pressure; (3) the present invention can quickly install the floating collar and floating shoe by means of the quick-install assembly to improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a cross-sectional view of the overall structure of the present invention.

[0023] Figure 3 It is a schematic diagram of the structure of the discharging assembly of the present invention.

[0024] Figure 4 The local structure of the discharging assembly of the present invention is shown in FIG. Figure 1 .

[0025] Figure 5 The local structure of the discharging assembly of the present invention is shown in FIG. Figure 2 .

[0026] Figure 6 The local structure of the discharging assembly of the present invention is shown in FIG. Figure 3 .

[0027] Figure 7 for Figure 6 Enlarged schematic diagram at point A in the middle.

[0028] Figure 8 It is a cross-sectional view of the discharge assembly structure of the present invention.

[0029] Fig. 9 A schematic structural diagram of the quick-install assembly of the present invention.

[0030] Fig.10 The local structure of the quick-install assembly of the present invention is shown in FIG. Figure 1 .

[0031] Fig.11 The local structure of the quick-install assembly of the present invention is shown in FIG. Figure 2 .

[0032] Fig.12 The local structure of the quick-install assembly of the present invention is shown in FIG. Figure 3 .

[0033] Fig.13It is a schematic diagram of the structure of the centering component of the present invention.

[0034] Fig.14 It is a schematic diagram of the local structure of the centering component of the present invention.

[0035] Fig.15 This is a cross-sectional view of the centering component structure of the present invention.

[0036] Fig.16 It is a schematic diagram of the support assembly structure of the present invention.

[0037] Fig.17 It is a cross-sectional view of the support component structure of the present invention.

[0038] Reference numerals: 1-discharging assembly; 2-quick-install assembly; 3-centering assembly; 4-support assembly; 101-discharging housing; 102-blocking ball 1; 103-spring 1; 104-control housing; 105-control board; 106-piston 1; 107-rack 1; 108-gear 1; 109-piston 2; 110-rack 2; 201-connecting pipe; 202-fixing plate; 203-limiting plate; 204-rubber plate; 205-limiting column; 206-rubber plate; 207-fixing groove; 208-locking ring; 209-release groove 1; 211-release groove 2; 301-support housing;

[0039] 302-diverter plate; 303-connecting rod 1; 304-connecting rod 2; 305-pressure plate; 306-spring 2; 307-driving column; 308-connecting plate;

[0040] 309-blocking ball 2; 310-blocking plate; 401-circulation housing; 402-support plate; 403-spring 3. DETAILED DESCRIPTION

[0041] The specific implementation of the device of the present invention is further described below in conjunction with the accompanying drawings and exemplary embodiments.

[0042] refer to Figures 1 to 17 As shown, a floating hoop and floating shoe for cementing construction includes a discharge assembly 1 placed at the bottom of the well and used to pour cement into the well, the discharge assembly 1 is provided with a support assembly 4 for stabilizing the discharge assembly 1 in the well hole, the support assembly 4 is provided with a quick-install assembly 2, and the quick-install assembly 2 is provided with a centering assembly 3.

[0043] The discharge assembly 1 includes a discharge housing 101, a blocking ball 102 is slidably arranged in the discharge housing 101, a spring 103 is arranged between the blocking ball 102 and the discharge housing 101, a control housing 104 is arranged on the discharge housing 101, and a

[0044] A piston 109 is slidably disposed on the discharge housing 101, two groups of pistons 106 are slidably disposed on the control housing 104, one group of the two groups of pistons 106 is located inside the discharge housing 101, and the other group of pistons 106 is located outside the discharge housing 101, and a control board 105 is slidably disposed in the discharge housing 101, and the sliding space of the control board 105 and the sliding space of the piston 109 form a first chamber, and the control housing

[0045] 104 and the first chamber are filled with hydraulic oil, a group of pistons 106 outside the discharge housing 101 are provided with a rack 107, and a piston 109 is provided with a rack 110. A gear 108 is provided inside the control housing 104 for rotation, and the gear 108 is meshed with the rack 110 and the rack 107 at the same time. When cement flows into the discharge housing 101 from the upper end of the discharge housing 101, the cement pushes the blocking ball 102 open, and the blocking ball 102 squeezes the spring 103, and the cement enters the discharge housing 101. The setting of the blocking ball 102 and the spring 103 prevents the cement in the discharge housing 101 from flowing back. After the cement enters the discharge housing 101, it is transported into the well hole through the lower end of the discharge housing 101. In the initial state, the two groups of control panels 105 are in a closed state. When the cement is in the discharge housing

[0046] 101, cement squeezes a group of pistons 106 inside the discharge housing 101, and at this time, another group of pistons 106 is pushed out, and piston 106 drives rack 107 to move, rack 107 drives gear 108 to rotate, gear 108 drives rack 2 110 to move, and rack 2 110 drives piston 2 109 to move upward. At this time, the control panel 105 is in an opened state. When cement flows into the discharge housing 101 and the well wall, a group of pistons 106 outside the control housing 104 are subjected to pressure. At this time, both groups of pistons 106 are subjected to pressure, and the pressure on the outer piston 106 gradually increases. At this time, piston 106 pushes rack 1

[0047] 107 moves, rack 107 drives gear 108 to rotate, gear 108 drives rack 2 110 to move, rack 2 110 drives piston 2 109 to move downward, and piston 2 109 pushes control plate 105 to close through the first chamber, slowing down the speed of cement output and avoiding damage to equipment caused by excessive pressure rise.

[0048] The quick-install assembly 2 includes a connecting tube 201, a first end of the connecting tube 201 is connected to the supporting shell 301, a second end of the connecting tube 201 is provided with a limiting plate 203, and the quick-install assembly 2 also includes a fixing plate 202, a first end of the fixing plate 202 is connected to the circulation shell 401, and three groups of limiting columns 205 are provided on the second end of the fixing plate 202, and a fixing groove 207 is provided on the limiting column 205. A rubber plate 204 is provided at the lower end of the limiting plate 203, and three groups of rubber plates 206 are provided on the rubber plate 204. A locking ring 208 is provided on the rubber plate 206, and the locking ring 208 is intermittently fixed to the fixing groove 207. The fixed ring 208 is provided with a release groove 1 209, and the limiting plate 203 is provided with a release groove 211. The release groove 211 is intermittently fitted with the release groove 1 209. The limiting plate 203 is provided with multiple groups of grooves. The rubber plate 206 swings in the grooves in the limiting plate 203. The limiting plate 203, the rubber plate 204 and the locking ring 208 are all provided with three groups of sliding holes. The limiting plate 203, the rubber plate 204 and the locking ring 208 are slidably connected with the limiting column 205 through the sliding holes. The sliding holes on the rubber plate 204 and the locking ring 208 are not aligned in the initial state. The limiting plate 203 and The sliding holes on the rubber disk 204 are aligned in the initial state, the top of the limiting column 205 is provided with an inclined surface, and the lower end of the sliding hole on the locking ring 208 is provided with an inclined surface. When the quick-release assembly 2 and the support assembly 4 are connected, the sliding hole on the rubber disk 204 is aligned with the limiting column 205. At this time, the rubber disk 204 and the limiting disk 203 are placed on the fixed disk 202. At this time, since the locking ring 208 is not aligned with the limiting column 205 in the initial state, at this time, through the setting of the limiting column 205 and the inclined surface on the locking ring 208, the locking ring 208 rotates in the limiting disk 203 through the setting of the rubber plate 206. When the locking ring 2 When the sliding hole of 08 is aligned with the limiting column 205, the rubber plate 206 is in a twisted state. At this time, when the locking ring 208 moves to the position of the fixing groove 207, the locking ring 208 is stuck into the fixing groove 207 through the deformation recovery force of the rubber plate 206. When the rubber disc 204 and the limiting disc 203 are fixed on the fixing disc 202, the release groove 1 209 is fitted with the release groove 211. When it needs to be removed, use a pin to insert into the release groove 211 to push the release groove 1 209 to rotate, so that the fixation of the locking ring 208 and the fixing groove 207 is released, and the rubber disc 204 and the limiting disc 203 are pulled out.

[0049] The centering component 3 includes a supporting shell 301, a diverter plate 302 is provided at the first end of the supporting shell 301, the second end of the supporting shell 301 is connected to the connecting pipe 201, a blocking ball 309 and a baffle plate 310 are provided in the supporting shell 301, a diverter plate 302 is provided on the supporting shell 301, a pressure plate 305 is slidably provided in the supporting shell 301, a spring 2 306 is provided between the pressure plate 305 and the supporting shell 301, the sliding space of the pressure plate 305 and the sliding space of the driving column 307 form a second chamber, a connecting plate 308 is slidably provided in the supporting shell 301, a plurality of driving columns 307 are provided on the connecting plate 308, and the driving columns 307 and the supporting shell

[0050] 301 sliding connection, the connecting plate 308 is rotatably provided with a plurality of connecting rods 2 304, and the connecting rods 2 304 are rotatably provided with connecting rods 1

[0051] 303, connecting rod 1 303 is rotatably connected to the supporting shell 301 through connecting rod 2 304. When cement is injected, a small amount of cement flows into the pressure plate 305 through the diverter plate 302. At this time, the pressure plate 305 is squeezed and descended. The pressure plate 305 squeezes the driving column 307 through the second chamber. When the driving column 307 descends, it pushes the connecting plate 308 to descend. The connecting plate 308 drives the connecting rod 2 304 to rotate. The connecting rod 2 304 drives the connecting rod 1 303 to rotate. At this time, multiple groups of connecting rods 1 303 are stretched outward to adjust the supporting shell 301 and the well hole to be concentric. At the same time, when the cement falls into the lower end of the supporting shell 301, the buoyancy pushes the blocking ball 2 309 to the supporting shell 301, and the baffle plate 310 prevents the blocking ball 2 309 from falling.

[0052] The support assembly 4 includes a circulation shell 401, on which a plurality of support plates 402 are slidably arranged, and a spring 403 is arranged between the support plate 402 and the circulation shell 401. When the circulation shell 401 is filled with cement, the support plate 402 is squeezed by pressure, and at this time, the support plate 402 slides on the circulation shell 401, and the plurality of support plates 402 press against the well wall to fix the discharge assembly 1 in the well.

[0053] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by technicians in the relevant technical field based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A floating collar and floating shoe for cementing construction, comprising a discharge assembly (1), a support assembly (4) being arranged on the discharge assembly (1), a quick-install assembly (2) being arranged on the support assembly (4), and a centering assembly (3) being arranged on the quick-install assembly (2), characterized in that: The discharging assembly (1) comprises a discharging housing (101), wherein two groups of pressure regulating mechanisms are arranged in the discharging housing (101), a blocking ball (102) is arranged at the axial position inside the discharging housing (101) through a sliding rod, wherein the sliding rod and the inner wall of the discharging housing (101) are slidably matched through a star-shaped bracket, and a spring (103) is arranged between the ball part of the blocking ball (102) and the star-shaped bracket, wherein the spring (103) is arranged around the sliding rod; The quick-install assembly (2) comprises a connecting tube (201) and a fixed disk (202); a rotation locking mechanism is arranged on the connecting tube (201); a plurality of limiting columns (205) are fixedly arranged on the fixed disk (202); and the limiting columns (205) are intermittently fixed to the rotation locking mechanism; The centering component (3) comprises a supporting shell (301), one end of which is fixedly provided with a diverter plate (302), the other end of which is fixedly connected to a connecting pipe (201), a pressure swing mechanism is arranged in the supporting shell (301), a narrowing opening is arranged on the inner wall of the supporting shell (301), a blocking ball 2 (309) is overlapped and matched at the narrowing opening, a baffle plate (310) is arranged on the side of the blocking ball 2 (309), and the baffle plate (310) is fixed in the air on the inner wall of the supporting shell (301).

2. A floating collar and floating shoe for cementing construction according to claim 1, characterized in that: The discharge housing (101) comprises a conical portion, a disc fixedly matched with the bottom edge of the conical portion, and a cylindrical shell fixed with the bottom edge of the conical portion, the partial pressure regulating mechanism comprises two control housings (104) fixedly mounted on the disc of the discharge housing (101), the disc of the discharge housing (101) is provided with two piston holes 1, and pistons 2 (109) are slidably arranged in the two piston holes 1; Each of the control housings (104) is provided with two coaxial piston holes 2, the axes of the two piston holes 2 are perpendicular to the axis of the discharge housing (101), and pistons 1 (106) are slidably arranged in the two piston holes 2. A sliding space is arranged in the disc of the discharge housing (101), and a control board (105) is slidably sealed in the sliding space. The sliding space is connected to the interior of the piston hole 1 to form a first chamber. The control housing (104) and the first chamber are filled with hydraulic oil, which is used to transfer the power of the piston 2 (109) to the control board (105) through the hydraulic oil, and the control board (105) is driven by hydraulic pressure to move.

3. A floating collar and floating shoe for cementing construction according to claim 2, characterized in that: The axes of the two pistons 1 (106) slidably arranged in the two piston holes 2 are arranged parallel to the radial direction of the discharge housing (101), so that one of the pistons 1 (106) is located on a side close to the axis of the discharge housing (101), and the other piston 1 (106) is located on a side away from the axis of the discharge housing (101); A rack 1 (107) is fixedly provided on the piston 1 (106) located on the side away from the axis of the discharge housing (101), a rack 2 (110) is fixedly provided on the piston 2 (109), and a gear 1 (108) is rotatably provided on the inner wall of the control housing (104), and the rack 1 (107) and the rack 2 (110) are meshed and transmitted through the gear 1 (108).

4. A floating collar and floating shoe for cementing construction according to claim 3, characterized in that: The rotation locking mechanism comprises a limit plate (203), the limit plate (203) is fixedly connected to the connecting pipe (201), a rubber plate (204) is fixedly arranged on the end surface of the limit plate (203), a plurality of rubber plates (206) are fixedly arranged on the rubber plate (204), all of the rubber plates (206) are fixedly matched with the locking ring (208), the limit plate (203) is a hollow cylinder, wherein the locking ring (208) is rotatably embedded on the inner wall of the hollow cylinder of the limit plate (203); a plurality of sliding through holes which are plugged and slidably matched with the limit column (205) are opened at the circumferential position on the limit plate (203) along its own axial direction; The limiting column (205) is provided with a fixing groove (207), and the locking ring (208) is engaged with the fixing groove (207) to form an intermittent fixing engagement relationship.

5. A floating collar and floating shoe for cementing construction according to claim 4, characterized in that: The locking ring (208) is provided with a first release groove (209), and the limiting plate (203) is provided with a second release groove (211). The first release groove (209) and the second release groove (211) are arranged in communication with each other, and are used to push the locking ring (208) to rotate in the limiting plate (203) through the second release groove (211) from the outside of the limiting plate (203). The limiting plate (203) is provided with the same number of grooves as the rubber plate (206), and the rubber plate (206) swings in the grooves in the limiting plate (203); The limiting plate (203), the rubber plate (204) and the locking ring (208) are all provided with sliding through holes through which the limiting column (205) can pass, and the limiting plate (203), the locking ring (208) and the rubber plate (204) are all plug-connected and slidably matched with the limiting column (205).

6. A floating collar and floating shoe for cementing construction according to claim 5, characterized in that: The sliding through holes on the rubber disk (204) and the locking ring (208) are not aligned in an initial state, and the sliding through holes on the limiting disk (203) and the rubber disk (204) are aligned in an initial state.

7. A floating collar and floating shoe for cementing construction according to claim 6, characterized in that: The pressure swing mechanism comprises a pressure plate (305), and a coaxial concave sliding space is provided at one end of the support shell (301) located at the diverter plate (302), wherein the pressure plate (305) is slidably matched with the circumferential inner wall of the concave sliding space, and a second spring (306) is fixedly provided between the pressure plate (305) and the bottom end surface of the sliding space; A connecting disk (308) is coaxially slidably disposed on the inner wall of the supporting shell (301), and a plurality of driving posts (307) arranged parallel to the axis of the supporting shell (301) are fixedly mounted on the connecting disk (308), and all the driving posts (307) are arranged in a circular array on the connecting disk (308), and the driving posts (307) are slidably disposed on the supporting shell (301) in an embedded manner; A plurality of strip grooves are provided on the support shell (301) along its radial direction, and all the strip grooves are arranged in a circular equidistant array on the support shell (301), and a connecting rod 1 (303) is provided in each strip groove, and one end of the connecting rod 1 (303) is movably connected to the connecting plate (308) through a connecting rod 2 (304), and the other end of the connecting rod 1 (303) is movably connected to the support shell (301) through a connecting rod 2 (304); The sliding space of the driving column (307) and the concave sliding space where the pressure plate (305) is located form a second chamber.

8. A floating collar and floating shoe for cementing construction according to claim 7, characterized in that: The support assembly (4) comprises a circulation shell (401), on which a plurality of support plates (402) are provided for sliding along the radial direction of the circulation shell (401), and a spring three (403) is provided between the support plate (402) and the circulation shell (401).

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