High-temperature and high-pressure complete set of float collar and float shoe

Abstract

The invention relates to the technical field of float collar float shoes, and provides a high-temperature and high-pressure complete float collar float shoe which comprises a float collar shell, a float shoe shell and a second sleeve, the top of the float collar shell is in threaded connection with a first connecting pipe, the bottom of the float collar shell is in threaded connection with a second connecting pipe, and the bottom of the second connecting pipe is in threaded connection with the float shoe shell. A through hole is formed in the bottom of the float shoe shell in a penetrating mode, reinforcing sealing assemblies are installed in the float collar shell and the float shoe shell correspondingly, second valve seats are fixedly connected in the float collar shell and the float shoe shell correspondingly, a guide rod is fixedly welded to the inner wall of a second sleeve, and a third spring is fixedly welded to the bottom end face of the interior of the second sleeve. And a rotating plate is welded and fixed to the top end of the third spring. By means of the technical scheme, the problems that in the prior art, a float collar float shoe cannot automatically clean a valve element, and meanwhile reinforcing and automatic and stable multi-stage sealing cannot be conducted on the position of the valve element are solved.

Description

Technical Field

[0001] The invention relates to the technical field of floating collars and floating shoes, and in particular to a complete set of high-temperature and high-pressure floating collars and floating shoes. 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 lowering of casing. They cooperate with each other to ensure the safe and stable installation of casing in complex downhole environments.

[0003] However, the existing floating collar and floating shoe have some problems in the actual working process. For example, a floating collar and floating shoe for cementing construction with publication number CN113216897B pre-stores grouting liquid during the working process, and after the grouting liquid stops being transported, the valve core is automatically flushed with the pre-stored grouting liquid. However, there is also mud in the pre-stored grouting liquid, so the cleaning effect of the valve core cannot be achieved; and in the actual working process, the compressive strength is poor, the sealing means is relatively single, and the valve core cannot be strengthened and automatically stabilized by multi-stage sealing. Therefore, the floating collar and the floating shoe are easily deformed by the pressure in the well during the process of going down to the well, which leads to the dislocation of the valve core and the valve seat, affecting the subsequent sealing performance of anti-backflow. Therefore, it is necessary to provide a set of high-temperature and high-pressure floating collar and floating shoe to meet the needs of users. Summary of the invention

[0004] The present invention proposes a set of high-temperature and high-pressure floating collars and floating shoes, which solves the problem in the related art that the floating collars and floating shoes cannot automatically clean the valve core and cannot strengthen and automatically stabilize the multi-stage sealing of the valve core.

[0005] The technical solution of the present invention is as follows:

[0006] A high-temperature and high-pressure floating hoop and floating shoe set comprises a floating hoop shell, a floating shoe shell and a second sleeve, the top of the floating hoop shell is threadedly connected to a first connecting pipe, the bottom of the floating hoop shell is threadedly connected to a second connecting pipe, the bottom of the second connecting pipe is threadedly connected to a floating shoe shell, a through hole is penetrated through the bottom of the floating shoe shell, a reinforced sealing assembly is installed in the floating hoop shell and the floating shoe shell, a second valve seat is fixedly connected in the floating hoop shell and the floating shoe shell, a guide rod is welded and fixed on the inner wall of the second sleeve, a third spring is welded and fixed on the inner bottom end surface of the second sleeve, a rotating plate is welded and fixed on the top end of the third spring, a second support rod is rotatably connected on the rotating plate, a guide groove is opened on the second support rod, the end of the guide rod is limitedly slidably connected in the guide groove, a second support plate is welded and fixed on the top end of the second support rod, and a second valve core is fixedly connected on the top end surface of the second support plate.

[0007] As a preferred solution of the present invention, the reinforced sealing assembly includes a reinforcement tube and a reinforcement rod, the reinforcement tube is welded and fixed to the inner wall of the floating hoop shell and the inner wall of the floating shoe shell, one end of the reinforcement rod is welded and fixed to the inner wall of the reinforcement tube, the other end of the reinforcement rod is welded and fixed to a fixing tube, a first sleeve is welded and fixed inside the fixing tube, a first spring is welded and fixed on the inner bottom end surface of the first sleeve, and a first support rod is welded and fixed to the top end of the first spring.

[0008] As a preferred solution of the present invention, there are four groups of reinforcing rods, which are distributed at equal angles in the fixing tube, and the vertical center line of the fixing tube and the vertical center line of the reinforcing tube are located on the same vertical line.

[0009] As a preferred solution of the present invention, wherein: a first support plate is welded and fixed to the top end of the first support rod, a first valve core is fixedly connected to the top end surface of the first support plate, a first valve seat is fixedly connected to the inner wall of the float hoop shell and the inner wall of the float shoe shell, a first valve hole is opened on the first valve seat and the second valve seat, a second valve hole is opened on the first valve seat and the second valve seat, the first valve hole is communicated with the second valve hole, and the first valve core and the second valve core are both made of high-temperature fluororubber material.

[0010] As a preferred solution of the present invention, a connecting plate is welded and fixed on the side end surface of the first support plate, a plug rod is welded and fixed on the top end surface of the connecting plate, the top end of the plug rod is fixedly connected to a rubber piston, the top end of the rubber piston is fixedly connected to a second spring, the top end of the second spring is fixedly connected to the inner top end surface of the plug tube, and the plug tube is fixedly connected in the first valve seat.

[0011] As a preferred solution of the present invention, there are four connecting plates, which are distributed at equal angles on the side end surface of the first support plate, the connecting plates correspond one-to-one with the plug tubes through the plug rods, the plug rods correspond one-to-one with the rubber pistons, and the bottom end surface of the plug tubes is flush with the bottom end surface of the first valve seat.

[0012] As a preferred solution of the present invention, wherein: the top side end of the plug tube is connected to the first air guide tube, the first air guide tube is connected to the second air guide tube, the bottom end of the second air guide tube is connected to the rubber airbag, the first valve seat is provided with a receiving groove, the rubber airbag is fixedly connected in the receiving groove, the plug tube corresponds to the first air guide tube one by one, three second air guide tubes are provided, and the three first air guide tubes are equidistantly distributed at the bottom of the first air guide tube, three receiving grooves are provided, and the three receiving grooves are equidistantly distributed along the direction of the second valve hole, the receiving grooves correspond to the rubber airbags one by one, the three rubber airbags correspond to the three first air guide tubes on the second air guide tube one by one, and the rubber airbag is in a circular shape as a whole.

[0013] As a preferred solution of the present invention, the bottom end of the second sleeve is fixedly connected to the top end surface of the first valve core, the guide groove is spiral, and the floating collar shell and the floating shoe shell are both made of titanium alloy material.

[0014] As a preferred solution of the present invention, a sliding groove is provided at the bottom of the second support plate, a fourth spring is welded and fixed on the inner side end surface of the sliding groove, a sliding rod is welded and fixed on the fourth spring, the top of the sliding rod is in a "T" shape, the top of the sliding rod is limitedly slidably connected in the sliding groove, and a scraper rod is welded and fixed to the bottom end of the sliding rod.

[0015] As a preferred solution of the present invention, there are four sliding grooves, which are distributed at equal angles on the bottom of the second support plate. The sliding grooves correspond one-to-one with the sliding rods through the fourth spring, and the sliding rods correspond one-to-one with the scraping rods, and the scraping rods are inclined.

[0016] The working principle and beneficial effects of the present invention are:

[0017] 1. The present invention is provided with a reinforced sealing assembly. During the cementing construction process, when the float collar shell and the float shoe shell are lowered into the well, under the support and reinforcement of the reinforcement tube and the reinforcement rod, the float collar shell and the float shoe shell are prevented from being deformed by the well pressure, thereby causing the first valve core and the first valve seat to be misaligned, affecting the subsequent sealing performance of anti-backflow. In addition, the float collar shell and the float shoe shell made of titanium alloy material, and the first valve core and the second valve core made of high-temperature fluororubber material can effectively improve the high temperature and high pressure resistance of the float collar and the float shoe, thereby effectively improving the service life of the float collar and the float shoe; and when the grouting fluid stops being transported, the first valve core automatically moves upward and resets through the first spring, and automatically closes to avoid backflow. At the same time, the first valve core can drive the rubber piston to move automatically through the plug rod, and can automatically inflate multiple rubber airbags in combination with the first air guide pipe and the second air guide pipe, so as to achieve multi-stage sealing treatment, further improving the sealing performance of the first valve core, thereby avoiding the problem of grouting fluid backflow caused by the poor sealing of the float collar and the float shoe, affecting the cementing quality.

[0018] 2. The present invention is provided with a second valve seat and a second valve core. When the grouting liquid stops being transported, the first valve core automatically moves upward and resets through the first spring, and automatically closes to avoid backflow. At the same time, the first valve core combined with the third spring and the second support rod in the second sleeve can push the second valve core to automatically move upward. Combined with the second valve seat and the first valve seat, double valve sealing can be achieved, further improving the sealing performance of the floating hoop and floating shoe.

[0019] 3. The present invention is provided with a sliding rod and a scraper rod. During the grouting liquid delivery process, when the second valve core moves downward to open, the sliding rod can drive the scraper rod to automatically contact the first valve core. After the grouting liquid stops being delivered, during the upward movement of the second valve core, under the guiding action of the guide rod and the guide groove, the second valve core in the upward movement can be driven to automatically rotate, and then each sliding rod can drive the corresponding scraper rod to automatically rotate, so that the sealing contact part of the first valve core can be automatically scraped and cleaned, so as to avoid mud impurities in the grouting liquid from remaining on the first valve core, thereby ensuring that the first valve core can be effectively closed and maintaining the high sealing performance of the floating hoop and floating shoe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the connection structure of the reinforcing tube and the reinforcing rod of the present invention;

[0024] Figure 4 It is a schematic diagram of the connection structure between the first sleeve and the first spring of the present invention;

[0025] Figure 5 The present invention Figure 4 The enlarged structural diagram at A in the middle;

[0026] Figure 6 It is a schematic diagram of the connection structure between the second air guide tube and the rubber air bag of the present invention;

[0027] Figure 7 It is a schematic diagram of the connection structure between the first valve hole and the second valve hole of the present invention;

[0028] Figure 8 It is a schematic diagram of the connection structure between the connecting plate and the plug rod of the present invention;

[0029] Fig. 9 It is a schematic diagram of the connection structure between the second support plate and the sliding groove of the present invention;

[0030] Fig.10 is a schematic diagram of the connection structure between the fourth spring and the sliding rod of the present invention;

[0031] Fig.11 It is a schematic diagram of the main cross-sectional structure of the second sleeve of the present invention;

[0032] Fig.12 It is a schematic diagram of the top-sectional structure of the second sleeve of the present invention.

[0033] In the figure: 1, floating collar shell; 2, floating shoe shell; 3, through hole; 4, first connecting pipe; 5, second connecting pipe; 6, reinforcing sealing assembly; 601, reinforcing cylinder; 602, reinforcing rod; 603, fixing cylinder; 604, first sleeve; 605, sealing ring; 606, first spring; 607, first supporting rod; 608, first supporting plate; 609, first valve core; 610, first valve seat; 611, first valve hole; 612, second valve hole; 613, connecting plate; 614, plug rod; 615, rubber piston; 616, second spring; 617, plug tube; 618, first air duct; 619, second air duct; 620, rubber airbag; 621, storage groove; 7, second valve seat; 8, second sleeve; 9, guide rod; 10, third spring; 11, rotating plate; 12, second support rod; 13, guide groove; 14, second support plate; 15, rubber tube; 16, second valve core; 17, sliding groove; 18, fourth spring; 19, sliding rod; 20, scraper rod. DETAILED DESCRIPTION

[0034] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0035] Example 1

[0036] like Figures 1 to 8 , Fig.11 and Fig.12As shown, this embodiment proposes a high-temperature and high-pressure floating collar and floating shoe, including a floating collar shell 1, a floating shoe shell 2 and a second sleeve 8. The top of the floating collar shell 1 is threadedly connected to a first connecting pipe 4, the bottom of the floating collar shell 1 is threadedly connected to a second connecting pipe 5, the bottom of the second connecting pipe 5 is threadedly connected to a floating shoe shell 2, and a through hole 3 is penetrated through the bottom of the floating shoe shell 2. A reinforced sealing component 6 is installed in the floating collar shell 1 and the floating shoe shell 2. A second valve seat 7 is fixedly connected in the floating collar shell 1 and the floating shoe shell 2. A guide rod 9 is welded and fixed on the inner wall of the second sleeve 8. A third spring 10 is welded and fixed on the inner bottom end surface of the second sleeve 8. A rotating plate 11 is welded and fixed on the top of the third spring 10. The rotating plate 11 is rotatably connected to the second support A guide groove 13 is provided on the support rod 12, and the end of the guide rod 9 is limitedly slidably connected in the guide groove 13. A second support plate 14 is welded and fixed to the top end of the second support rod 12, and a rubber tube 15 is fixedly connected to the bottom end surface of the second support plate 14. The bottom end of the rubber tube 15 is fixedly connected to the top end of the second sleeve 8, and a second valve core 16 is fixedly connected to the top end surface of the second support plate 14. The cooperation of the reinforced sealing component 6 and the second valve core 16 can achieve double valve sealing, effectively improving the sealing performance of the floating hoop and floating shoe, and under the multi-stage sealing action of the reinforced sealing component 6, the sealing performance of the floating hoop and floating shoe can be further improved, thereby avoiding the problem of grouting fluid backflow caused by poor sealing of the floating hoop and floating shoe, which affects the cementing quality.

[0037] Example 2

[0038] like Figures 1 to 12 As shown, based on the same concept as the above-mentioned embodiment 1, this embodiment also proposes a set of high-temperature and high-pressure floating collars and floating shoes.

[0039] In this embodiment, the reinforced sealing assembly 6 includes a reinforcing tube 601 and a reinforcing rod 602. The reinforcing tube 601 is welded and fixed to the inner wall of the floating collar shell 1 and the inner wall of the floating shoe shell 2. One end of the reinforcing rod 602 is welded and fixed to the inner wall of the reinforcing tube 601. The other end of the reinforcing rod 602 is welded and fixed to a fixing tube 603. A first sleeve 604 is welded and fixed in the fixing tube 603. A sealing ring 605 is fixedly connected to the top of the first sleeve 604. A first spring 606 is welded and fixed to the inner bottom end surface of the first sleeve 604. A first support rod 607 is welded and fixed to the top of the first spring 606. The bottom of the first support rod 607 is limitedly slidably connected in the first sleeve 604. The third spring 606 is welded and fixed to the inner bottom end surface of the first sleeve 604. The elastic strength of the spring 10 is less than the elastic strength of the first spring 606, and four groups of reinforcing rods 602 are arranged. The four groups of reinforcing rods 602 are distributed at equal angles in the fixed tube 603. The vertical center line of the fixed tube 603 and the vertical center line of the reinforcing tube 601 are located on the same vertical line. The inner wall of the sealing ring 605 fits with the outer wall of the first support rod 607. During the cementing construction process, when the float hoop shell 1 and the float shoe shell 2 are lowered into the well, the support and reinforcement of the reinforcing tube 601 and the reinforcing rod 602 prevent the float hoop shell 1 and the float shoe shell 2 from being deformed by the pressure in the well, which in turn causes the first valve core 609 and the first valve seat 610 to be misaligned, affecting the subsequent sealing performance of anti-backflow.

[0040] In this embodiment, a first support plate 608 is welded and fixed to the top end of the first support rod 607, a first valve core 609 is fixedly connected to the top end surface of the first support plate 608, a first valve seat 610 is fixedly connected to the inner wall of the floating hoop shell 1 and the inner wall of the floating shoe shell 2, the shape and size of the first valve seat 610 are the same as the shape and size of the second valve seat 7, a first valve hole 611 is provided on the first valve seat 610 and the second valve seat 7, a second valve hole 612 is provided on the first valve seat 610 and the second valve seat 7, the first valve hole 611 is connected to the second valve hole 612, the inner wall of the second valve hole 612 is inclined, the first valve core 609 and the second valve core 16 are both truncated, the shape and size of the first valve core 609 are the same as the shape and size of the second valve core 16, the first valve core 609 and the second valve core 16 are Made of high-temperature fluororubber material, the float collar shell 1 and the float shoe shell 2 are both made of titanium alloy material. The float collar shell 1 and the float shoe shell 2 made of titanium alloy material, as well as the first valve core 609 and the second valve core 16 made of high-temperature fluororubber material, can effectively improve the high temperature and high pressure resistance of the float collar and the float shoe, thereby effectively improving the service life of the float collar and the float shoe; and when the grouting liquid stops being transported, the first valve core 609 automatically moves upward and resets through the first spring 606, and automatically closes to avoid backflow. At the same time, the first valve core 609 combined with the third spring 10 and the second support rod 12 in the second sleeve 8 can push the second valve core 16 to move automatically upward, and combined with the second valve seat 7 and the first valve seat 610 can achieve double valve sealing, further improving the sealing performance of the float collar and the float shoe.

[0041] In this embodiment, a connecting plate 613 is welded and fixed on the side end surface of the first support plate 608, a plug rod 614 is welded and fixed on the top surface of the connecting plate 613, a rubber piston 615 is fixedly connected to the top of the plug rod 614, a second spring 616 is fixedly connected to the top of the rubber piston 615, the top of the second spring 616 is fixedly connected to the inner top surface of the plug tube 617, the plug tube 617 is fixedly connected to the first valve seat 610, the plug rod 614 and the rubber piston 615 are both slidably connected to the plug tube 617, and the connecting plate 613 is set There are four connecting plates 613, which are distributed at equal angles on the side end surface of the first supporting plate 608. The connecting plates 613 correspond to the plug tubes 617 one by one through the plug rods 614. The plug rods 614 correspond to the rubber pistons 615 one by one. The rubber pistons 615 fit the inner wall of the plug tubes 617. The bottom end surface of the plug tubes 617 is flush with the bottom end surface of the first valve seat 610. The top side end of the plug tubes 617 is connected to the first air guide tube 618. The first air guide tube 618 is connected to the second air guide tube 619. The bottom end of the second air guide tube 619 is connected to the rubber airbag 618. 20, a receiving groove 621 is provided in the first valve seat 610, and the rubber airbag 620 is fixedly connected in the receiving groove 621. The plug tube 617 corresponds to the first air guide tube 618 one by one. The second air guide tube 619 is provided with three, and the three first air guide tubes 618 are equidistantly distributed at the bottom of the first air guide tube 618. The receiving groove 621 is provided with three, and the three receiving grooves 621 are equidistantly distributed along the direction of the second valve hole 612. The receiving groove 621 corresponds to the rubber airbag 620 one by one, and the three rubber airbags 620 are connected to the three second air guide tubes 619. There is a one-to-one correspondence between the air guide tube 618 and the rubber airbag 620, and the whole is in a circular ring shape. When the grouting liquid stops being delivered, the first valve core 609 automatically moves upward and resets through the first spring 606, and automatically closes to avoid backflow. At the same time, the first valve core 609 can drive the rubber piston 615 to move automatically through the plug rod 614. Combined with the first air guide tube 618 and the second air guide tube 619, multiple rubber airbags 620 can be automatically inflated to achieve multi-stage sealing processing, which further improves the sealing performance of the first valve core 609.

[0042] In this embodiment, the bottom end of the second sleeve 8 is fixedly connected to the top end surface of the first valve core 609, the vertical center line of the second sleeve 8, the vertical center line of the rotating plate 11, the vertical center line of the second support rod 12 and the vertical center line of the second support plate 14 are all located on the same vertical line, the guide groove 13 is spiral, and the diameter of the rubber tube 15 is the same as the diameter of the second sleeve 8. Under the sealing and protective effect of the rubber tube 15, the grouting liquid can be prevented from entering the second sleeve 8 and causing adverse effects on subsequent guiding work.

[0043] In this embodiment, a sliding groove 17 is provided at the bottom of the second support plate 14, a fourth spring 18 is welded and fixed on the inner side end surface of the sliding groove 17, a sliding rod 19 is welded and fixed on the fourth spring 18, the top of the sliding rod 19 is in a "T" shape, the top of the sliding rod 19 is limitedly slidably connected in the sliding groove 17, a scraper rod 20 is welded and fixed at the bottom of the sliding rod 19, four sliding grooves 17 are provided, and the four sliding grooves 17 are distributed at equal angles at the bottom of the second support plate 14, the sliding grooves 17 correspond one-to-one with the sliding rod 19 through the fourth spring 18, the sliding rod 19 corresponds one-to-one with the scraper rod 20, the scraper rod 20 is inclined, and the inclination angle of the scraper rod 20 is the same as the inclination angle of the side end surface of the first valve core 609. During the grouting liquid delivery process, when the second valve core 16 moves downward to open, the sliding rod 19 can drive the scraper rod 20 to automatically contact the first valve core 609. After the grouting liquid stops being delivered, during the upward movement of the second valve core 16, under the guidance of the guide rod 9 and the guide groove 13, the second valve core 16 in the upward movement can be driven to automatically rotate, and then the corresponding scraper rod 20 can be driven to automatically rotate through each sliding rod 19, so that the sealing contact part of the first valve core 609 can be automatically scraped and cleaned to avoid mud impurities in the grouting liquid remaining on the first valve core 609, thereby ensuring that the first valve core 609 can be effectively closed and the high sealing performance of the floating hoop and floating shoe is maintained.

[0044] It should be noted that the present invention is a set of high-temperature and high-pressure floating collar and floating shoe. First, the first connecting pipe 4 is connected to the top of the floating collar shell 1 through a thread, the bottom of the floating collar shell 1 is connected to the second connecting pipe 5 through a thread, and the bottom of the second connecting pipe 5 is connected to the floating shoe shell 2 through a thread. During the cementing construction process, when the floating collar shell 1 and the floating shoe shell 2 are lowered into the well, the floating collar shell 1 and the floating shoe shell 2 can be supported and reinforced by the joint action of the reinforcing tube 601 and each group of reinforcing rods 602 to prevent the floating collar shell 1 and the floating shoe shell 2 from being deformed by the well pressure. When conveying the grouting fluid, under the action of the conveying pressure of the grouting fluid, the second valve core 16 can be pushed downward and separated from the second valve hole 612 on the second valve seat 7. Therefore, the second valve core 16 can drive the second support rod 12 to move toward the inside of the second sleeve 8 through the second support plate 14. At this time, the second valve core 16 moves toward the first valve core 609, while the first valve core 609 does not move.

[0045] Subsequently, the grouting liquid can be delivered to the first valve seat 610 through the first valve hole 611 and the second valve hole 612 on the second valve seat 7. Similarly, under the delivery pressure of the grouting liquid, the first valve core 609 can be pushed downward and separated from the second valve hole 612 on the first valve seat 610. Similarly, the grouting liquid can be delivered to the first valve core 609 and the through hole 3 at the bottom of the float shoe shell 2 through the first connecting pipe 4, the second connecting pipe 5, and the float collar shell 1 to achieve grouting work; and in the process of the second valve core 16 moving toward the first valve core 609, the second valve core 16 can drive the second support plate 14 to move downward. The scraper rod 20 at the bottom of the sliding rod 19 is in contact with the inclined surface of the first valve core 609, and under the guidance of the inclined surface of the first valve core 609, each sliding rod 19 and the corresponding scraper rod 20 can be pushed to move automatically to the side; and during the downward movement of the first valve core 609, the first support plate 608 can drive each connecting plate 613 to move synchronously, and then drive the rubber piston 615 on the plug rod 614 to move downward in the corresponding plug tube 617, so that the gas in the rubber airbag 620 can be sucked through the first air guide tube 618 and the second air guide tube 619.

[0046] When the grouting liquid stops being transported, under the elastic action of the third spring 10 inside the second sleeve 8, the second support rod 12 on the rotating plate 11 can be pushed to move upward, and then the second valve core 16 on the second support plate 14 can be pushed to move upward. At the same time, under the guiding action of the guide rod 9 and the guide groove 13, the second support rod 12 in the upward movement process can be driven to rotate automatically, and then the second support plate 14 and the second valve core 16 can be driven to move synchronously. At this time, under the upward and rotational action of the second support plate 14, the corresponding scraper rod 20 can be driven to rotate automatically through each sliding rod 19, and then the sealing contact part of the first valve core 609 can be automatically scraped and cleaned, and each sliding rod 19 can be automatically reset through the fourth spring 18 during the upward movement and rotation process to prevent the scraper rod 20 from blocking the subsequent sealing work of the first valve core 609.

[0047] After the second valve core 16 moves upward and resets, the second valve hole 612 on the second valve seat 7 can be automatically closed. Similarly, under the elastic action of the first spring 606 inside the first sleeve 604, the first valve core 609 on the first support plate 608 can be driven to move upward and reset through the first support rod 607, and the second valve hole 612 on the first valve seat 610 can be automatically closed to avoid the backflow of grouting liquid. In addition, the combination of the second valve seat 7 and the first valve seat 610 can achieve double valve sealing, further improving the sealing performance of the floating hoop and floating shoe.

[0048] And during the upward movement and reset process of the first valve core 609, the first supporting plate 608 can drive the various connecting plates 613 to move synchronously, and then drive the rubber pistons 615 on the various plug rods 614 to move upward and reset in the corresponding plug tubes 617 at the same time. At this time, under the movement of the rubber piston 615, the first air guide tube 618 on the plug tube 617, combined with the various second air guide tubes 619, can automatically inflate the rubber airbags 620 in each receiving groove 621. After inflation, each rubber airbag 620 can be in close contact with the first valve core 609, realizing multi-stage sealing treatment at the first valve core 609, further improving the sealing performance at the first valve core 609, thereby avoiding the problem of grouting fluid backflow caused by poor sealing of the floating hoop and floating shoe, affecting the cementing quality.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. High temperature and high pressure complete set of floating collar and floating shoe, characterized by: The invention comprises a float collar shell (1), a float shoe shell (2) and a second sleeve (8), wherein the top of the float collar shell (1) is threadedly connected to a first connecting pipe (4), the bottom of the float collar shell (1) is threadedly connected to a second connecting pipe (5), the bottom of the second connecting pipe (5) is threadedly connected to a float shoe shell (2), a through hole (3) is formed through the bottom of the float shoe shell (2), a reinforced sealing assembly (6) is installed in the float collar shell (1) and the float shoe shell (2), a second valve seat (7) is fixedly connected in the float collar shell (1) and the float shoe shell (2), and the second sleeve (8) is provided with a plurality of sealing assemblies (6) disposed in the ... A guide rod (9) is welded and fixed on the wall, a third spring (10) is welded and fixed on the inner bottom end surface of the second sleeve (8), a rotating plate (11) is welded and fixed on the top end of the third spring (10), a second support rod (12) is rotatably connected to the rotating plate (11), a guide groove (13) is provided on the second support rod (12), the end of the guide rod (9) is limitedly slidably connected in the guide groove (13), a second support plate (14) is welded and fixed on the top end of the second support rod (12), and a second valve core (16) is fixedly connected to the top end surface of the second support plate (14).

2. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 1 is characterized in that: The reinforced sealing assembly (6) comprises a reinforcing tube (601) and a reinforcing rod (602), wherein the reinforcing tube (601) is welded and fixed to the inner wall of the floating collar shell (1) and the inner wall of the floating shoe shell (2), one end of the reinforcing rod (602) is welded and fixed to the inner wall of the reinforcing tube (601), and the other end of the reinforcing rod (602) is welded and fixed to a fixing tube (603), a first sleeve (604) is welded and fixed inside the fixing tube (603), a first spring (606) is welded and fixed to the inner bottom end surface of the first sleeve (604), and a first support rod (607) is welded and fixed to the top end of the first spring (606).

3. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 2 is characterized in that: The reinforcing rods (602) are provided in four groups, and the four groups of reinforcing rods (602) are distributed at equal angles in the fixing tube (603), and the vertical center line of the fixing tube (603) and the vertical center line of the reinforcing tube (601) are located on the same vertical line.

4. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 3 is characterized in that: A first support plate (608) is welded and fixed to the top end of the first support rod (607), a first valve core (609) is fixedly connected to the top end surface of the first support plate (608), a first valve seat (610) is fixedly connected to the inner wall of the float hoop shell (1) and the inner wall of the float shoe shell (2), a first valve hole (611) is provided on the first valve seat (610) and the second valve seat (7), a second valve hole (612) is provided on the first valve seat (610) and the second valve seat (7), the first valve hole (611) is communicated with the second valve hole (612), and the first valve core (609) and the second valve core (16) are both made of high-temperature fluororubber material.

5. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 4 is characterized in that: A connecting plate (613) is welded and fixed to the side end surface of the first support plate (608), a plug rod (614) is welded and fixed to the top end surface of the connecting plate (613), the top end of the plug rod (614) is fixedly connected to a rubber piston (615), the top end of the rubber piston (615) is fixedly connected to a second spring (616), the top end of the second spring (616) is fixedly connected to the inner top end surface of the plug tube (617), and the plug tube (617) is fixedly connected in the first valve seat (610).

6. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 5 is characterized in that: Four connecting plates (613) are provided, and the four connecting plates (613) are distributed at equal angles on the side end surface of the first support plate (608). The connecting plates (613) correspond one-to-one with the plug tubes (617) through the plug rods (614), and the plug rods (614) correspond one-to-one with the rubber pistons (615). The bottom end surface of the plug tube (617) is flush with the bottom end surface of the first valve seat (610).

7. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 6 is characterized in that: The top side end of the plug tube (617) is connected to a first air guide tube (618), the first air guide tube (618) is connected to a second air guide tube (619), the bottom end of the second air guide tube (619) is connected to a rubber air bag (620), a receiving groove (621) is provided in the first valve seat (610), the rubber air bag (620) is fixedly connected in the receiving groove (621), the plug tube (617) corresponds to the first air guide tube (618) one by one, and the second air guide tube (619) is connected to a second air bag (620). 19) are provided with three, the three first air guide tubes (618) are equidistantly distributed at the bottom of the first air guide tube (618), the three receiving grooves (621) are provided with three, the three receiving grooves (621) are equidistantly distributed along the direction of the second valve hole (612), the receiving grooves (621) correspond one-to-one with the rubber airbags (620), the three rubber airbags (620) correspond one-to-one with the three first air guide tubes (618) on the second air guide tube (619), and the rubber airbag (620) is in a circular ring shape as a whole.

8. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 4, characterized in that: The bottom end of the second sleeve (8) is fixedly connected to the top end surface of the first valve core (609), the guide groove (13) is spiral-shaped, and the floating collar shell (1) and the floating shoe shell (2) are both made of titanium alloy material.

9. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 4, characterized in that: A sliding groove (17) is provided at the bottom of the second support plate (14), a fourth spring (18) is welded and fixed on the inner side end surface of the sliding groove (17), a sliding rod (19) is welded and fixed on the fourth spring (18), the top of the sliding rod (19) is in a "T" shape, the top of the sliding rod (19) is limitedly slidably connected in the sliding groove (17), and a scraper rod (20) is welded and fixed at the bottom end of the sliding rod (19).

10. The high temperature and high pressure complete set of floating collar and floating shoe according to claim 9, characterized in that: Four sliding grooves (17) are provided, and the four sliding grooves (17) are distributed at equal angles on the bottom of the second support plate (14). The sliding grooves (17) correspond one-to-one with the sliding rods (19) through the fourth spring (18), and the sliding rods (19) correspond one-to-one with the scraping rods (20), and the scraping rods (20) are inclined.

Images