Float collar float shoe for well cementation
By improving the structure of the floating collar and floating shoe and combining it with the blocking and self-locking mechanism, the problem of the valve requiring large hydraulic pressure and backflow was solved, and the smooth inflow of drilling fluid and enhanced sealing were achieved.
Patent Information
- Application Number
- CN202510960402.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2025-09-19
AI Technical Summary
The valves of existing float collars and float shoes require a large hydraulic force to open, and when the feed is stopped, the drilling fluid and impurities in the well are prone to backflow problems.
The combination of the first blocking mechanism, the second blocking mechanism and the self-locking mechanism is adopted, a spring is used to provide damping effect, and the grinding action between the valve core and the valve seat is used to enhance the sealing effect and prevent backflow.
It reduces the damping force requirement of the hydraulic pump, ensures the smooth inflow of drilling fluid, and effectively prevents the backflow of drilling fluid and impurities in the well when the feed is stopped, thereby improving the sealing performance of the valve.
Smart Images
Figure CN120667058A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of drilling, in particular to a floating collar and a floating shoe for cementing. Background Art
[0002] Float collars and float shoes are common downhole tools, mainly used in cementing operations of oil and gas wells. They are indispensable tools in cementing construction. Float collars and float shoes have key functions such as preventing liquid backflow, controlling well pressure, and guiding the smooth installation of casing. They work together to ensure the safe and stable installation of casing in complex downhole environments.
[0003] Two one-way valves are usually installed in the float collar and float shoe respectively. The two valves usually use two damping springs. This requires a sufficiently large hydraulic force when the drilling fluid enters the well, which tests the power of the hydraulic pump. Moreover, when the feeding is stopped, some drilling fluid and impurities in the well will be stuck in the valve, resulting in insufficient sealing of the valve, which can easily cause the drilling fluid and impurities in the well to flow back.
[0004] In view of the above problems, it is necessary to improve the existing equipment. Summary of the Invention
[0005] The object of the present invention is to provide a floating collar and a floating shoe for cementing to solve the problems raised in the above background technology.
[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a float collar and a float shoe for cementing, comprising a float shoe shell, a float collar shell, a valve seat 1, a valve seat 2, a first plugging mechanism, a second plugging mechanism, a self-locking mechanism and a hydraulic transmission mechanism; the float shoe shell is threadedly connected to the lower end of the float collar shell, the valve seat 1 is fixed to the inner wall of the float shoe shell, the valve seat 2 is fixed to the inner wall of the float collar shell, the first plugging mechanism is arranged below the valve seat 1, the second plugging mechanism is arranged between the valve seat 1 and the valve seat 2, and the self-locking mechanism and the hydraulic transmission mechanism are both arranged between the second plugging mechanism and the valve seat 1.
[0007] Furthermore, preferably, the first blocking mechanism includes a limit plate, a limit cylinder, a slide rod 1, a valve core 1 and a spring 1; the limit plate is fixed on the inner wall of the float shoe shell, and a plurality of connecting holes are opened on the eccentric side circumference of the limit plate, the limit cylinder is fixed at the center of the upper end of the limit plate, the slide rod 1 is slidably penetrated in the limit cylinder, the valve core 1 is fixed at the upper end of the slide rod 1, and the valve core 1 is in active contact with the lower end wall of the valve seat, and the two ends of the spring 1 are fixedly connected between the valve core 1 and the limit cylinder.
[0008] Furthermore, as a preference, the second blocking mechanism includes a connecting tube, a sliding rod 2, a valve core 2 and a spring 2; the connecting tube is fixed to the upper end of the valve core 1, and the connecting tube sealingly slides through the center of the valve seat 1, the sliding rod 2 sealingly slides through and is arranged in the connecting tube, the valve core 2 is set on the upper end of the sliding rod 2, and the valve core 2 is in active contact with the lower end wall of the valve seat 2, and the two ends of the spring 2 are fixedly connected between the sliding rod 2 and the inner wall of the connecting tube.
[0009] Furthermore, as a preference, the self-locking mechanism includes an extension tube, a plug, a slider 1, a spring 3 and a hose 1; an insertion hole is axially opened in the slide rod 2, the extension tube is fixed on the side wall of the connecting tube, the plug is slidably arranged in the extension tube and the insertion hole, a slide groove 1 is opened in the deflection side of the valve seat 1, the slider 1 is sealingly slidably arranged in the slide groove 1, both ends of the spring 3 are fixed between the slider 1 and the upper end wall of the slide groove 1, one end of the hose 1 passes through the valve seat 1 and is connected with the slide groove 1, and the other end of the hose 1 is connected with the extension tube.
[0010] Furthermore, as a preference, an introduction hole is opened in the second sliding rod, and both ends of the introduction hole are respectively connected to the insertion hole and the connecting tube.
[0011] Furthermore, preferably, the hydraulic transmission mechanism includes a slider 2 and a spring 4; a slide groove 2 is also provided in the eccentric side of the valve seat 1, the slider 2 is sealingly slidably arranged in the slide groove 2, and the two ends of the spring 4 are fixed between the slider 2 and the inner wall of the slide groove 2.
[0012] Furthermore, as a preference, the hydraulic transmission mechanism also includes a fixed block, a steering block and a second hose; a T-shaped ring groove is provided in the second valve core, the upper end of the second slide rod is sealingly slidably arranged in the T-shaped ring groove, the fixed block is fixed on the upper end side wall of the second slide rod, and the fixed block is sealingly slidably arranged in the T-shaped ring groove, the steering block is fixed on the inner wall of the T-shaped ring groove, and a closed space is formed between the fixed block and the steering block, an oil inlet nozzle is fixed on the side of the fixed block facing the steering block, an oil inlet hole is provided in the second slide rod, one end of the second hose is connected to the oil inlet hole, and the other end passes through the valve seat one and is connected to the second slide groove.
[0013] Furthermore, as a preference, an air outlet is provided on the bottom wall of the T-shaped ring groove on the side of the fixed block close to the steering block.
[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This cementing float collar and float shoe utilizes a combination of a first plugging mechanism, a second plugging mechanism, and a self-locking mechanism. During the feeding process, only one spring is used to provide damping for valve cores 1 and 2, thereby reducing the damping force that the hydraulic pump needs to overcome and allowing the drilling fluid to flow smoothly into the well. 2. The floating collar and floating shoe for cementing use a combination of a self-locking mechanism and a hydraulic transmission mechanism. When feeding is stopped, a grinding action is formed between the valve core 2 and the valve seat 2, which can grind away impurities on the valve core 2, preventing impurities from being stuck in the gap between the valve core 2 and the valve seat 2, thereby enhancing the sealing effect between the valve core 2 and the valve seat 2 and preventing the backflow of drilling fluid and impurities in the well. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic structural diagram of the first blocking mechanism of the present invention; Figure 3 It is a structural schematic diagram of the second blocking mechanism and the self-locking mechanism of the present invention; Figure 4 For the present invention Figure 3 A in the middle is an enlarged schematic diagram; Figure 5 For the present invention Figure 3 The enlarged schematic diagram of point B in the middle; Figure 6 It is a structural schematic diagram of the hydraulic transmission mechanism of the present invention; Figure 7 For the present invention Figure 6 The enlarged schematic diagram of point C in the middle; Figure 8 For the present invention Figure 6 The enlarged schematic diagram of point D in the middle; Figure 9 It is a schematic diagram of the cross-sectional structure of the valve core of the present invention.
[0016] Figure: 1, float shoe housing; 11, feed port; 2, float collar housing; 3, valve seat 1; 4, valve seat 2; 5, first blocking mechanism; 6, second blocking mechanism; 7, self-locking mechanism; 8, hydraulic transmission mechanism; 11, feed port; 51, limit plate; 511, connecting hole; 52, limit cylinder; 53, slide rod 1; 54, valve core 1; 55, spring 1; 511, connecting hole; 61, connecting cylinder; 62, slide rod 2; 63 , valve core two; 64, spring two; 71, extension tube; 72, plug; 73, slider one; 74, spring three; 75, hose one; 621, insertion hole; 731, introduction hole; 31, slide one; 32, slide two; 81, slider two; 82, spring four; 83, fixing block; 84, steering block; 85, hose two; 631, T-ring groove; 622, oil inlet hole; 831, oil inlet nozzle; 632, air outlet. DETAILED DESCRIPTION
[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.
[0018] See also Figures 1 to 9 The present invention provides a technical solution: a float collar and a float shoe for cementing, comprising a float shoe housing 1, a float collar housing 2, a valve seat 1 3, a valve seat 2 4, a first plugging mechanism 5, a second plugging mechanism 6, a self-locking mechanism 7, and a hydraulic transmission mechanism 8; the float shoe housing 1 is threadedly connected to the lower end of the float collar housing 2, the valve seat 1 3 is fixed to the inner wall of the float shoe housing 1, the valve seat 2 4 is fixed to the inner wall of the float collar housing 2, the first plugging mechanism 5 is arranged below the valve seat 1 3, the second plugging mechanism 6 is arranged between the valve seat 1 3 and the valve seat 2 4, and the self-locking mechanism 7 and the hydraulic transmission mechanism 8 are both arranged between the second plugging mechanism 6 and the valve seat 1 3.
[0019] A feed port 11 is provided at the lower end of the float shoe housing 1 for introducing drilling fluid into the well.
[0020] As a preferred embodiment, the first blocking mechanism 5 includes a limit plate 51, a limit cylinder 52, a slide rod 53, a valve core 54 and a spring 55; the limit plate 51 is fixed on the inner wall of the float shoe housing 1, and a plurality of connecting holes 511 are opened on the eccentric side circumference of the limit plate 51. The limit cylinder 52 is fixed at the center of the upper end of the limit plate 51, and the slide rod 53 is slidably penetrated in the limit cylinder 52. The valve core 54 is fixed at the upper end of the slide rod 53, and the valve core 54 is in active contact with the lower end wall of the valve seat 3. The two ends of the spring 55 are fixedly connected between the valve core 54 and the limit cylinder 52.
[0021] Please refer to the following for details: Figure 2 When the valve core 54 is subjected to a downward force, the spring 55 contracts and stores energy, and the valve core 54 moves downward, and then the valve seat 3 is opened, and the upper and lower ends of the valve seat 3 are connected.
[0022] As a preferred embodiment, the second blocking mechanism 6 includes a connecting tube 61, a sliding rod 62, a valve core 63 and a spring 64; the connecting tube 61 is fixed to the upper end of the valve core 54, and the connecting tube 61 slides and seals through the center of the valve seat 3, the sliding rod 62 slides and seals through the connecting tube 61, the valve core 63 is sleeved on the upper end of the sliding rod 62, and the valve core 63 is in active contact with the lower end wall of the valve seat 4, and the two ends of the spring 64 are fixedly connected between the sliding rod 62 and the inner wall of the connecting tube 61.
[0023] It should be noted that the second spring 64 is always in an energy storage state, that is, when the second slide bar 62 is not locked, the second spring 64 always exerts an upward force on the second slide bar 62.
[0024] As a preferred embodiment, the self-locking mechanism 7 includes an extension tube 71, a plug 72, a slider 73, a spring 3 74 and a hose 75; an insertion hole 621 is axially opened in the slide rod 2, the extension tube 71 is fixed on the side wall of the connecting tube 61, the plug 72 is slidably set in the extension tube 71 and the insertion hole 621, a slide groove 31 is opened in the deflected side of the valve seat 3, the slider 73 is sealingly slidably set in the slide groove 31, both ends of the spring 3 74 are fixed between the slider 73 and the upper end wall of the slide groove 31, one end of the hose 75 passes through the valve seat 3 and is connected to the slide groove 31, and the other end of the hose 75 is connected to the extension tube 71.
[0025] As a preferred embodiment, an introduction hole 731 is opened in the second sliding rod 62, and both ends of the introduction hole 731 are respectively connected to the insertion hole 621 and the connecting tube 61.
[0026] For explanation, see Figure 3 and Figure 4 When the plug 72 is placed between the insertion hole 621 and the extension tube 71, the plug 72 will limit the radial movement of the slide rod 2 62. That is, in this state, the slide rod 2 62 and the connecting tube 61 are rigidly connected. When the plug 72 is completely placed in the insertion hole 621, the limiting effect of the plug 72 on the slide rod 2 62 disappears, and the spring 2 64 will release the elastic potential energy, thereby generating an upward force on the valve core 2 63 through the slide rod 2 62.
[0027] Specifically, during the feeding process, the drilling fluid first pushes the valve core 2 63 downward under the action of the external hydraulic pump, and the valve seat 2 4 is opened. During this process, since the spring 3 74 remains in its original state and there is no air pressure in the hose 1 75, the plug 72 is in the insertion hole 621 and the extension tube 71, and then the connecting tube 61 will move downward synchronously with the slide rod 2 62, and the connecting tube 61 will push the valve core 1 54 downward, thereby opening the valve seat 1 3 and compressing the spring 1 55.
[0028] When the feeding is stopped, the drilling fluid no longer flows in, and the energy-stored spring 155 releases its elastic potential energy, the valve core 154 will block the valve seat 13, and the valve core 263 will block the valve seat 24 to prevent the drilling fluid and impurities in the well from flowing back. At the same time, the drilling fluid and impurities in the well will flow back to the bottom of the valve seat 13 through the connecting hole 511, and exert an upward force on the slider 173, so that the air pressure in the slide groove 131 and the hose 175 increases, and this air pressure will push the plug 72 to move into the insertion hole 621. When the plug 72 is completely moved into the insertion hole 621, the limiting effect of the plug 72 on the slide rod 262 is released, and the spring 264 will exert an upward force on the slide rod 262, thereby increasing the squeezing force of the valve core 263 on the valve seat 24, improving the sealing effect of the valve core 263, and further preventing the drilling fluid and impurities from flowing back.
[0029] It should be noted that the elastic force of spring 2 64 is smaller than that of spring 1 55 , which prevents the valve core 1 54 from remaining disabled after the slide rod 2 62 is released from the limit, thereby preventing the valve seat 1 3 from being reopened and causing backflow.
[0030] To sum up, combined with the self-locking mechanism 7, during the feeding process, only one spring 1 55 is used to provide damping effect on the valve core 1 54 and the valve core 2 63, reducing the damping force that the hydraulic pump needs to overcome, so that the drilling fluid can flow smoothly into the well; when the feeding is stopped, the spring 2 64 generates a thrust on the valve core 2 63, increasing the extrusion force between the valve core 2 63 and the valve seat 2 4, improving the sealing effect, and further avoiding backflow.
[0031] In addition, it should be noted that when the plug 72 moves into the insertion hole 621, the gas in the insertion hole 621 will enter the connecting tube 61 through the inlet hole 731 for gas replenishment, preventing the negative pressure formed in the sealed space between the connecting tube 61 and the slide rod 2 62 from preventing the slide rod 2 62 from moving upward.
[0032] As a preferred embodiment, the hydraulic transmission mechanism 8 includes a slider 2 81 and a spring 4 82; a slide groove 2 32 is also provided in the eccentric side of the valve seat 1 3, and the slider 2 81 is sealingly slidably arranged in the slide groove 2 32, and the two ends of the spring 4 82 are fixed between the slider 2 81 and the inner wall of the slide groove 2 32.
[0033] As a preferred embodiment, the hydraulic transmission mechanism 8 also includes a fixed block 83, a steering block 84 and a second hose 85; a T-shaped ring groove 631 is provided in the second valve core 63, and the upper end of the second slide rod 62 is sealingly slidably set in the T-shaped ring groove 631, the fixed block 83 is fixed on the upper end side wall of the second slide rod 62, and the fixed block 83 is sealingly slidably set in the T-shaped ring groove 631, the steering block 84 is fixed on the inner wall of the T-shaped ring groove 631, and a closed space is formed between the fixed block 83 and the steering block 84, and an oil inlet nozzle 831 is fixed on the side of the fixed block 83 facing the steering block 84, an oil inlet hole 622 is provided in the second slide rod 62, one end of the second hose 85 is connected to the oil inlet hole 622, and the other end passes through the valve seat 1 3 and is connected to the second slide groove 32.
[0034] Among them, hydraulic oil is provided in the above-mentioned enclosed space, the oil inlet hole 622, the second hose 85 and the second slide groove 32.
[0035] Please refer to the following for details: Figures 6 to 9 When the feed is stopped, the drilling fluid and impurities in the well generate an upward force on the slider 1 73, and also generate an upward force on the slider 2 81. The spring 4 82 contracts, and the hydraulic oil in the slide 2 32 flows into the closed space between the fixed block 83 and the steering block 84. The volume of this space increases, that is, the steering block 84 will rotate relative to the slide rod 2 62, while the slide rod 2 62 does not rotate under the limiting action of the spring 2 64. Therefore, the steering block 84 will drive the valve core 2 63 to rotate relative to the valve seat 2 4. In the above, the spring 2 64 has a certain squeezing force on the valve core 2 63, so the valve core 2 63 will form a grinding action with the valve seat 2 4, which can grind away impurities remaining on the valve core 2 63, prevent impurities from being stuck between the valve core 2 63 and the valve seat 2 4, prevent the formation of a channel gap, improve the sealing effect of the valve core 2 63 on the valve seat 2 4, and further prevent the backflow of drilling fluid and impurities in the well.
[0036] As a preferred embodiment, an air vent 632 is provided on the bottom wall of the T-shaped ring groove 631 on the side of the fixed block 83 close to the steering block 84 to prevent positive pressure from being formed between the fixed block 83 and the steering block 84 to prevent the steering block 84 from rotating.
[0037] The working process of the floating collar and floating shoe device for cementing is as follows: during the slurry feeding process, the plug 72 limits the slide rod 2 62, and the valve core 2 63 and the valve core 1 54 move downward synchronously, that is, the valve seat 1 3 and the valve seat 2 4 are opened synchronously, and the drilling fluid will enter the inlet through the two valve seats. When the feeding is stopped, under the elastic force of the spring 1 55, the valve core 1 54 and the valve core 2 63 respectively seal the valve seat 1 3 and the valve seat 2 4. During this period, the drilling fluid entering the floating collar and the impurities in the well indirectly provide power for the plug 72. When the plug 72 is completely moved into the insertion hole 621, the limiting effect of the plug 72 on the slide rod 2 62 is released. , the spring 2 64 will produce an upward thrust on the valve core 2 63. At the same time, the drilling fluid and impurities in the well that enter the float collar can cause the hydraulic oil in the slide groove 2 32 to enter the closed space in the T-shaped ring groove 631, thereby driving the valve core 2 63 to rotate relative to the valve seat 2 4. Therefore, a grinding action will be formed between the valve core 2 63 and the valve seat 2 4, which can grind away the impurities remaining on the valve core 2 63, prevent the impurities from being stuck between the valve core 2 63 and the valve seat 2 4, avoid forming a gap, improve the sealing effect of the valve core 2 63 on the valve seat 2 4, and further prevent the backflow of drilling fluid and impurities in the well.
[0038] In summary, the floating collar and floating shoe device for cementing achieves the purpose of preventing the backflow of drilling fluid and impurities in the well, and meets people's usage needs.
[0039] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
[0040] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the protection content of the present invention.
[0041] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A floating collar and floating shoe for cementing, characterized in that: The invention comprises a float shoe shell (1), a float hoop shell (2), a valve seat 1 (3), a valve seat 2 (4), a first blocking mechanism (5), a second blocking mechanism (6), a self-locking mechanism (7) and a hydraulic transmission mechanism (8); the float shoe shell (1) is threadedly connected to the lower end of the float hoop shell (2); the valve seat 1 (3) is fixed on the inner wall of the float shoe shell (1); the valve seat 2 (4) is fixed on the inner wall of the float hoop shell (2); the first blocking mechanism (5) is arranged below the valve seat 1 (3); the second blocking mechanism (6) is arranged between the valve seat 1 (3) and the valve seat 2 (4); the self-locking mechanism (7) and the hydraulic transmission mechanism (8) are both arranged between the second blocking mechanism (6) and the valve seat 1 (3).
2. The floating collar and floating shoe for cementing according to claim 1, characterized in that: The first blocking mechanism (5) includes a limit plate (51), a limit cylinder (52), a slide rod (53), a valve core (54) and a spring (55); the limit plate (51) is fixed on the inner wall of the float shoe housing (1), a plurality of connecting holes (511) are opened on the eccentric side circumference of the limit plate (51), the limit cylinder (52) is fixed at the center of the upper end of the limit plate (51), the slide rod (53) is slidably arranged in the limit cylinder (52), the valve core (54) is fixed at the upper end of the slide rod (53), and the valve core (54) is in active contact with the lower end wall of the valve seat (3), and the two ends of the spring (55) are fixedly connected between the valve core (54) and the limit cylinder (52).
3. The floating collar and floating shoe for cementing according to claim 2, characterized in that: The second blocking mechanism (6) includes a connecting tube (61), a second slide rod (62), a second valve core (63) and a second spring (64); the connecting tube (61) is fixed to the upper end of the first valve core (54), and the connecting tube (61) is sealingly slidable and passes through the center of the first valve seat (3); the second slide rod (62) is sealingly slidable and is set in the connecting tube (61); the second valve core (63) is set on the upper end of the second slide rod (62), and the second valve core (63) is in active contact with the lower end wall of the second valve seat (4); the two ends of the second spring (64) are fixedly connected between the second slide rod (62) and the inner wall of the connecting tube (61).
4. The floating collar and floating shoe for cementing according to claim 3, characterized in that: The self-locking mechanism (7) includes an extension tube (71), a plug (72), a slider (73), a spring (74) and a hose (75); an insertion hole (621) is axially provided in the slide rod (62), the extension tube (71) is fixed on the side wall of the connecting tube (61), the plug (72) is slidably arranged in the extension tube (71) and the insertion hole (621), a slide groove (31) is provided in the deflection side of the valve seat (3), the slider (73) is sealingly slidably arranged in the slide groove (31), both ends of the spring (74) are fixed between the slider (73) and the upper end wall of the slide groove (31), one end of the hose (75) passes through the valve seat (3) and is connected to the slide groove (31), and the other end of the hose (75) is connected to the extension tube (71).
5. The floating collar and floating shoe for cementing according to claim 4, characterized in that: An introduction hole (731) is provided in the second slide rod (62), and both ends of the introduction hole (731) are respectively connected to the insertion hole (621) and the connection tube (61).
6. The floating collar and floating shoe for cementing according to claim 3, characterized in that: The hydraulic transmission mechanism (8) includes a slider 2 (81) and a spring 4 (82); a slide groove 2 (32) is also provided in the eccentric side of the valve seat 1 (3), the slider 2 (81) is sealingly slidably arranged in the slide groove 2 (32), and the two ends of the spring 4 (82) are fixed between the slider 2 (81) and the inner wall of the slide groove 2 (32).
7. The floating collar and floating shoe for cementing according to claim 6, characterized in that: The hydraulic transmission mechanism (8) further comprises a fixed block (83), a steering block (84) and a second hose (85); a T-shaped ring groove (631) is provided in the second valve core (63), the upper end of the second slide rod (62) is sealingly slidably arranged in the T-shaped ring groove (631), the fixed block (83) is fixed on the upper end side wall of the second slide rod (62), and the fixed block (83) is sealingly slidably arranged in the T-shaped ring groove (631), the steering block (84) is fixed on the inner wall of the T-shaped ring groove (631), and a closed space is formed between the fixed block (83) and the steering block (84), an oil inlet nozzle (831) is fixed on the side of the fixed block (83) facing the steering block (84), an oil inlet hole (622) is provided in the second slide rod (62), one end of the second hose (85) is communicated with the oil inlet hole (622), and the other end passes through the first valve seat (3) and is communicated with the second slide groove (32).
8. The floating collar and floating shoe for cementing according to claim 7, characterized in that: An air outlet (632) is provided on the bottom wall of the T-shaped ring groove (631) on the side of the fixed block (83) close to the steering block (84).