High-pressure-resistant and corrosion-resistant integrated float shoe

Abstract

The invention discloses a high-pressure-resistant and corrosion-resistant integrated float shoe, and relates to the technical field of petroleum and natural gas extraction equipment, and the high-pressure-resistant and corrosion-resistant integrated float shoe comprises a float shoe mechanism, a corrosion-resistant mechanism, a high-pressure-resistant mechanism, a regulation and control mechanism, a first butt-joint sealing mechanism and a second butt-joint sealing mechanism. According to the anti-corrosion float shoe, the anti-corrosion sleeve serves as a main body protection structural component of the float shoe, is made of the anti-corrosion material and mainly plays a role in protecting internal components from being eroded by corrosive media such as hydrogen sulfide, carbon dioxide and high-salinity formation water in an oil exploitation environment, and meanwhile, a basic pressure bearing structure is provided for the float shoe; the float shoe can bear certain pressure underground and maintain the overall shape stable, the sealing top ring, the sealing pressing ring, the sealing outer ring and the sealing inner ring jointly form a multi-stage sealing structure, the sealing top ring is matched with the sealing pressing ring, the sealing outer ring and the sealing inner ring can be elastically deformed by applying pressure during installation, and therefore the sealing effect of the float shoe is improved. The float shoe is tightly attached to sealing surfaces such as the inner wall and the outer wall of a sleeve, and the sealing performance of the float shoe is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas extraction equipment, and particularly to an integrated float shoe with high pressure resistance and corrosion resistance. Background Art

[0002] During the extraction process of oil and gas, the cementing operation is a key link to ensure the long-term stable production of oil wells. As an important tool for the cementing operation, the float shoe is installed at the lowermost end of the casing string. Its main function is to guide the casing to smoothly enter the wellbore and prevent the backflow of cement slurry to ensure the cementing quality. With the gradual expansion of oil exploration and development into deep, ultra-deep, and marine and other complex environments, the downhole conditions have become extremely harsh.

[0003] In the prior art, such as the "Integrated Float Collar and Float Shoe Capable of Preventing Falling Off" with the patent application number: CN202311207449.0, it includes a float shoe body. A float shoe guiding cap is integrally connected to the lower end of the float shoe body. A flower basket is horizontally installed above the mouth of the float shoe guiding cap, and a ball rod extends upward from the middle of the flower basket. For the integrated float collar and float shoe capable of preventing falling off of the present invention, by remotely controlling the operation of the servo motor, the gear is driven to rotate and drive the outer gear ring to rotate at a reduced speed. When the outer gear ring rotates, several groups of long gears are driven to rotate through the internal gear part, and the respective rack bars move linearly in the rod limiting grooves towards the direction close to the ball rod. The wheel seat slowly extends out of the opening groove, and the clamping wheel contacts the surface of the ball rod and enters the arc-shaped groove. Several groups of clamping wheels clamp the ball rod from different directions, so that when the ball rod is impacted by cement, an auxiliary pressing force can be obtained, reducing the telescopic distance and also reducing the impact on the spring.

[0004] With the increase of the oil well depth, the downhole pressure increases sharply. The structural strength of ordinary float shoes is insufficient and they are prone to damage under high pressure, resulting in the failure of the float shoes and affecting the smooth progress of the cementing operation. At the same time, the crude oil and various chemical substances in the well have strong corrosiveness, which will erode the material of the float shoes, shorten the service life of the float shoes, and increase the production cost. In view of the above problems, an integrated float shoe with high pressure resistance and corrosion resistance is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an integrated float shoe with high pressure resistance and corrosion resistance to solve the problems in the prior art in the background art that as the oil well depth increases during operation, the downhole pressure increases sharply, the structural strength of ordinary float shoes is insufficient, they are prone to damage under high pressure, resulting in the failure of the float shoes and affecting the smooth progress of the cementing operation. At the same time, the crude oil and various chemical substances in the well have strong corrosiveness, which will erode the material of the float shoes, shorten the service life of the float shoes, and increase the production cost.

[0006] To achieve the above object, the present invention provides the following technical solutions: A high-pressure resistant and corrosion-resistant integrated float shoe, comprising a float shoe mechanism, a corrosion-resistant mechanism, a high-pressure resistant mechanism, a regulation mechanism, a first docking seal mechanism and a second docking seal mechanism. The float shoe mechanism includes a float shoe guiding cap. The corrosion-resistant mechanism includes a corrosion-resistant casing. A sealing pressure ring is provided at the top of the corrosion-resistant casing. A sealing bottom groove is opened at the bottom of the corrosion-resistant casing. A sealing ring is provided at the bottom of the sealing bottom groove. A pressing ring is press-fitted at the bottom of the sealing ring. A sealing outer ring and a sealing inner ring are provided at the bottom of the sealing pressure ring. A sealing top ring is provided between the sealing outer ring and the sealing inner ring. A notch is opened in a circle at the bottom of the pressing ring. A plugging rod is provided in a circle at the bottom of the sealing ring. A plugging groove is opened in a circle at the top of the pressing ring. The plugging rod is connected to the inside of the plugging groove; The high-pressure resistant mechanism includes a plurality of high-pressure resistant support spokes. A plurality of high-pressure resistant support rings are evenly distributed on the high-pressure resistant support spokes. A plurality of high-pressure resistant cross braces are distributed between two adjacent high-pressure resistant support spokes. The high-pressure resistant cross braces and the high-pressure resistant support rings are staggered.

[0007] Preferably, the regulation mechanism includes a connecting ring. A plurality of electric telescopic rods are evenly distributed at the bottom of the connecting ring. The output end of the electric telescopic rod is connected with a sealing sleeve ring.

[0008] Preferably, the regulation mechanism further includes a sealing sleeve and a liquid inlet hole. The sealing sleeve is arranged below the sealing sleeve ring. The sealing sleeve ring is hermetically sleeved on the outside of the liquid inlet hole.

[0009] Preferably, a controller is fixedly installed at the top of the connecting ring. A sensing wire is fixedly connected to the side of the controller. One end of the sensing wire is fixedly connected with a pressure sensor.

[0010] Preferably, the first docking seal mechanism includes a sealing installation ring. A sliding groove is opened on the outside of the sealing installation ring. A connecting sleeve ring is slidably connected to the outside of the sliding groove.

[0011] Preferably, a first sealing soft sleeve is provided at the top of the connecting sleeve ring. The top of the first sealing soft sleeve is connected with a docking sleeve ring. The sealing installation ring is arranged at the top of the corrosion-resistant casing.

[0012] Preferably, an inner support ring and inner support spokes are provided inside the sealing installation ring. The inner support spokes are distributed on the inner support ring.

[0013] Preferably, the second docking seal mechanism includes a connecting socket. A connecting snap ring is sleeved on the outside of the connecting socket. A second sealing soft sleeve is connected to the bottom of the connecting snap ring. The bottom of the second sealing soft sleeve is connected with a docking snap ring.

[0014] Preferably, first steel rings and second steel rings are distributed and arranged at both the upper and lower ends inside the second sealing soft sleeve. The bottom of the first steel ring is arranged at the bottom of the connecting snap ring, and the second steel ring is connected to the top of the docking snap ring.

[0015] Preferably, a flower basket is arranged at the top inside the floating shoe guide cap. A cue stick penetrates through the inside of the flower basket. A sleeve is arranged inside the floating shoe guide cap. The sleeve is arranged at the bottom of the flower basket. A spring is arranged on the outer side of the cue stick. The bottom of the cue stick is connected with a sealing ball. A resistance plate is arranged at the bottom of the sleeve. The bottom of the sealing ball is movably butted against the resistance plate. A threaded sleeve is arranged at the bottom inside the floating shoe guide cap.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the present invention, the corrosion-resistant casing is used as the main protective structural component of the floating shoe and is made of corrosion-resistant materials. Its main function is to protect the internal components from being eroded by corrosive media such as hydrogen sulfide, carbon dioxide, and high-salinity formation water in the oil extraction environment. At the same time, it provides a basic pressure-bearing structure for the floating shoe to ensure that the floating shoe can withstand a certain pressure underground and maintain the overall shape stable. The sealing top ring, sealing pressure ring, sealing outer ring, and sealing inner ring together constitute a multi-stage sealing structure. The sealing top ring and the sealing pressure ring cooperate to cause the sealing outer ring and the sealing inner ring to undergo elastic deformation when pressure is applied during installation, closely fitting on the sealing surfaces such as the inner wall and outer wall of the casing to prevent the leakage of media such as cement slurry and formation fluid, enhancing the sealing performance of the floating shoe and ensuring the smooth progress of the cementing operation. The sealing bottom groove provides an installation and positioning space for the bottom sealing component of the sealing ring to ensure the accurate installation of the bottom sealing structure and cooperate with other sealing components to form a complete sealing system to prevent fluid from leaking from the bottom of the floating shoe. The sealing ring has good elasticity and is installed at positions such as the sealing bottom groove. Under the action of pressure, it can tightly fill the gap and is the key component to prevent fluid leakage at the bottom of the floating shoe, enhancing the bottom sealing effect. The pressing ring applies a radial pressure to cooperate with the sealing structure to make the sealing component better fit the sealing surface, further enhancing the sealing effect. At the same time, it can also play a certain role in fixing and supporting the internal structure to maintain the relative position stability of the internal components of the floating shoe. The notch cooperates with the protrusions, blocks, and other structures of other components for positioning, installation, and connection between components to ensure the accurate assembly of each component, making the floating shoe structure compact and stable. The insertion rod can be inserted into the insertion groove to achieve rapid connection or positioning between components, facilitating assembly and disassembly. It can also prevent relative rotation or axial movement of components after installation to ensure the overall structural stability of the floating shoe.

[0017] 2. In the present invention, the high-pressure resistant support spokes extend radially outward from the central position inside the floating shoe to the inner wall or other support structures, mainly bearing the external high-pressure force and evenly dispersing the pressure to various parts of the floating shoe. In high-pressure environments such as deep sea, where the external pressure is huge, through its high-strength material and reasonable layout, the support spokes can effectively prevent the floating shoe from deforming due to excessive local pressure, maintain the overall stability of the floating shoe structure, ensure the integrity of its internal space, and guarantee the normal operation of internal components. The high-pressure resistant support ring is usually in a ring structure, surrounding a specific position inside the floating shoe, such as near the bottom or set at different height intervals. It plays a role of circumferential support and cooperates with the high-pressure resistant support spokes. When the floating shoe is subjected to external high pressure, the support ring can resist the radial deformation caused by the pressure, preventing the floating shoe from shrinking or expanding in the circumferential direction under the action of pressure. The high-pressure resistant cross braces are arranged in a cross form in the internal space of the floating shoe, connecting the support spokes or support rings at different positions to form a stable network support system. This cross structure greatly enhances the stability and integrity of the internal support structure of the floating shoe. Under the action of high pressure, the cross braces can disperse and transmit the pressure in multiple directions, effectively suppressing the distortion and deformation that may occur in the floating shoe structure under complex stress conditions, cooperating with the support spokes and support rings to comprehensively improve the high-pressure resistance performance of the floating shoe, enabling the floating shoe to withstand extreme high-pressure environments and ensuring the smooth progress of oil extraction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a perspective view of an integrated high-pressure resistant and corrosion-resistant floating shoe of the present invention; Figure 2 is a schematic structural view of another angle of an integrated high-pressure resistant and corrosion-resistant floating shoe of the present invention; Figure 3 is a schematic sectional view of an integrated high-pressure resistant and corrosion-resistant floating shoe of the present invention; Figure 4 is a partial sectional view of an integrated high-pressure resistant and corrosion-resistant floating shoe of the present invention; Figure 5 For the present invention Figure 4 is an enlarged schematic view of the structure at A in; Figure 6 is a partial structural view of an integrated high-pressure resistant and corrosion-resistant floating shoe of the present invention; Figure 7 is a partial sectional view of an integrated high-pressure resistant and corrosion-resistant floating shoe of the present invention; Figure 8 For the present invention Figure 7 is an enlarged schematic view of the structure at B in; Figure 9 is a partial structural view of an integrated high-pressure resistant and corrosion-resistant floating shoe of the present invention; Figure 10 Schematic structural diagram of the sealing mechanism of an integrated high-pressure resistant and corrosion-resistant floating shoe according to the present invention; Figure 11 Exploded structural diagram of the sealing mechanism of an integrated high-pressure resistant and corrosion-resistant floating shoe according to the present invention; Figure 12 Schematic structural diagram of an integrated high-pressure resistant and corrosion-resistant floating shoe according to the present invention.

[0019] In the figure: 1. Floating shoe mechanism; 101. Floating shoe guiding cap; 102. Flower basket; 103. Ball rod; 104. Sleeve; 105. Spring; 106. Sealing ball; 107. Resistance plate; 108. Threaded sleeve; 2. Corrosion-resistant mechanism; 201. Corrosion-resistant sleeve; 202. Sealing top ring; 203. Sealing pressure ring; 204. Sealing outer ring; 205. Sealing inner ring; 206. Sealing bottom groove; 207. Sealing ring; 208. Compression ring; 209. Notch; 210. Insertion rod; 211. Insertion groove; 3. High-pressure resistant mechanism; 301. High-pressure resistant support spoke; 302. High-pressure resistant support ring; 303. High-pressure resistant cross brace; 4. Regulation mechanism; 401. Connection ring; 402. Sealing sleeve ring; 403. Electric telescopic rod; 404. Sealing sleeve; 405. Liquid inlet hole; 406. Controller; 407. Sensing wire; 408. Pressure sensor; 5. First docking sealing mechanism; 501. Sealing installation ring; 502. Sliding groove; 503. Connection sleeve ring; 504. First sealing soft sleeve; 505. Docking sleeve ring; 506. Inner support ring; 507. Inner support spoke; 6. Second docking sealing mechanism; 601. Connection card seat; 602. Connection snap ring; 603. Second sealing soft sleeve; 604. Docking snap ring; 605. First steel ring; 606. Second steel ring. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1: As Figures 1 - 12As shown in the figure, the present invention provides a technical solution: a high-pressure resistant and corrosion-resistant integrated float shoe, which includes a float shoe mechanism 1, a corrosion-resistant mechanism 2, a high-pressure resistant mechanism 3, a regulation mechanism 4, a first docking and sealing mechanism 5 and a second docking and sealing mechanism 6. The float shoe mechanism 1 includes a float shoe guiding cap 101. The corrosion-resistant mechanism 2 includes a corrosion-resistant casing 201. A sealing pressure ring 203 is arranged at the top of the corrosion-resistant casing 201. A sealing bottom groove 206 is opened at the bottom of the corrosion-resistant casing 201. A sealing ring 207 is arranged at the bottom of the sealing bottom groove 206. A pressing ring 208 is press-fitted at the bottom of the sealing ring 207. A sealing outer ring 204 and a sealing inner ring 205 are arranged at the bottom of the sealing pressure ring 203. A sealing top ring 202 is arranged between the sealing outer ring 204 and the sealing inner ring 205. A notch 209 is opened in a circle at the bottom of the pressing ring 208. An insertion rod 210 is arranged in a circle at the bottom of the sealing ring 207. An insertion groove 211 is opened in a circle at the top of the pressing ring 208. The insertion rod 210 is connected to the inner side of the insertion groove 211. The high-pressure resistant mechanism 3 includes a plurality of high-pressure resistant support spokes 301. A plurality of high-pressure resistant support rings 302 are evenly distributed on the high-pressure resistant support spokes 301. A plurality of high-pressure resistant cross braces 303 are distributed between two adjacent high-pressure resistant support spokes 301. The high-pressure resistant cross braces 303 and the high-pressure resistant support rings 302 are staggered. A flower basket 102 is arranged at the inner top of the float shoe guiding cap 101. A ball rod 103 penetrates through the inside of the flower basket 102. A sleeve 104 is arranged inside the float shoe guiding cap 101. The sleeve 104 is arranged at the bottom of the flower basket 102. A spring 105 is arranged on the outer side of the ball rod 103. The bottom of the ball rod 103 is connected to a sealing ball 106. A resistance plate 107 is arranged at the bottom of the sleeve 104. The bottom of the sealing ball 106 is movably docked on the resistance plate 107. A threaded sleeve 108 is arranged at the inner bottom of the float shoe guiding cap 101.

[0022] In this embodiment, during the lowering process of the casing, the guide cap 101 of the float shoe is located at the front end of the float shoe and can be the first to contact the formation. Its special streamlined design can reduce the lowering resistance, guide the casing to smoothly enter the predetermined position, and at the same time protect the internal structure of the float shoe from possible collision damage during the lowering process. The flower basket 102 plays a role in filtering and dispersing fluids. When cement slurry is injected or formation fluids flow, the mesh or lattice structure of the flower basket 102 can filter out larger particle impurities, preventing them from blocking the liquid inlet holes or affecting the operation of internal components; at the same time, it evenly disperses the fluids, ensuring that the cement slurry evenly flows into the annular space between the casing and the formation, and improving the cementing quality. The ball rod 103 works in cooperation with the sealing ball 106. The ball rod 103 can be used as a connecting rod to operate the sealing ball 106. When it is necessary to close the liquid inlet channel, such as preventing the backflow of cement slurry, the internal pressure change is used to push the ball rod 103 to move, and then the position of the sealing ball 106 is controlled to achieve the opening and closing of the channel. The sleeve 104 provides support and protection for the internal components on the one hand, wrapping components such as the ball rod 103 and the spring 105 to protect them from external corrosive media; on the other hand, it plays a role in connection and positioning, ensuring the accurate installation position of other components and maintaining the stability of the overall structure of the float shoe. The spring 105 and the sealing ball 106 cooperate to achieve the automatic sealing function. When the cement slurry normally flows in, the pressure pushes the sealing ball to overcome the spring force to open the channel; when the injection of the cement slurry is completed or the pressure changes abnormally, the spring 105 rebounds, pushing the sealing ball 106 to reset and blocking the liquid inlet to prevent the backflow of the cement slurry, ensuring the smooth progress of the cementing operation. The sealing ball 106 is a key component for controlling the opening and closing of the liquid inlet channel. Under the action of the spring 105 and the ball rod 103, the sealing ball 106 can closely fit at the liquid inlet to form an effective seal, preventing the reverse flow of the cement slurry or formation fluids and ensuring the one-way conduction function of the float shoe. During the lowering process of the casing, the resistance plate 107 provides additional resistance by increasing the contact area with the well fluids, helping to stabilize the lowering speed of the casing and avoiding collisions or damages caused by excessive lowering speed; during cementing, it can also adjust the flow rate and flow direction of the cement slurry around the float shoe to make it more evenly distributed. The threaded casing 108 is used to connect the float shoe to other casings or equipment. Through threaded connection, the firmness and sealing performance of the connection are ensured, ensuring that in a high-pressure and highly corrosive environment, the float shoe is tightly combined with the entire casing system and works together to maintain the normal operation of oil extraction operations.

[0023] The corrosion-resistant casing 201, as the main protective structural component of the float shoe, is made of corrosion-resistant materials. Its main function is to protect the internal components from being eroded by corrosive media such as hydrogen sulfide, carbon dioxide, and high-salinity formation water in the oil extraction environment. At the same time, it provides a basic pressure-bearing structure for the float shoe to ensure that the float shoe can withstand a certain pressure underground and maintain the stability of the overall shape. Components such as the sealing top ring 202, the sealing pressure ring 203, the sealing outer ring 204, and the sealing inner ring 205 together constitute a multi-stage sealing structure. The sealing top ring and the sealing pressure ring cooperate. When installing, by applying pressure, the sealing outer ring and the sealing inner ring can undergo elastic deformation and closely fit on the sealing surfaces such as the inner wall and the outer wall of the casing, preventing the leakage of media such as cement slurry and formation fluid, enhancing the sealing performance of the float shoe, and ensuring the smooth progress of the cementing operation. The sealing bottom groove 206 provides an installation and positioning space for the bottom sealing component of the sealing ring 207, ensuring the accurate installation of the bottom sealing structure and cooperating with other sealing components to form a complete sealing system to prevent fluid from leaking from the bottom of the float shoe. The sealing ring 207 has good elasticity and is installed in positions such as the sealing bottom groove. Under the action of pressure, it can tightly fill the gap and is the key component to prevent fluid leakage at the bottom of the float shoe, enhancing the bottom sealing effect. The pressing ring 208, by applying radial pressure and cooperating with the sealing structure, enables the sealing components to better fit the sealing surface, further enhancing the sealing effect. At the same time, it can also play a certain role in fixing and supporting the internal structure, maintaining the relative position stability of the internal components of the float shoe. The notch 209 cooperates with the protrusions, blocks, and other structures of other components for positioning, installation, and connection between components, ensuring the accurate assembly of each component and making the structure of the float shoe compact and stable. The insertion rod 210 can be inserted into the insertion slot 211 to achieve rapid connection or positioning between components, facilitating assembly and disassembly. It can also prevent relative rotation or axial movement of the components after installation, ensuring the stability of the overall structure of the float shoe.

[0024] The high-pressure resistant support spokes 301 extend radially outward from the central position inside the floating shoe to the inner wall or other support structures, mainly bearing the high-pressure force from the outside and evenly dispersing the pressure to various parts of the floating shoe. In high-pressure environments such as the deep sea, where the external pressure is huge, through its high-strength material and reasonable layout, the support spokes can effectively prevent the floating shoe from deforming due to excessive local pressure, maintain the overall stability of the floating shoe structure, ensure the integrity of its internal space, and guarantee the normal operation of internal components. The high-pressure resistant support ring 302 is usually in a ring structure and surrounds a specific position inside the floating shoe, such as near the bottom or at different height intervals. It plays a role in circumferential support and cooperates with the high-pressure resistant support spokes. When the floating shoe is subjected to external high pressure, the support ring can resist the radial deformation caused by the pressure and prevent the floating shoe from shrinking or expanding in the circumferential direction under the action of the pressure. The high-pressure resistant cross braces 303 are arranged in a cross form in the internal space of the floating shoe, connecting the support spokes or support rings at different positions to form a stable network support system. This cross structure greatly enhances the stability and integrity of the internal support structure of the floating shoe. Under the action of high pressure, the cross braces can disperse and transfer the pressure in multiple directions, effectively suppressing the distortion and deformation that may occur in the floating shoe structure under complex stress conditions, cooperating with the support spokes and support rings to comprehensively improve the high-pressure resistance performance of the floating shoe, enabling the floating shoe to withstand extreme high-pressure environments and ensuring the smooth progress of oil extraction operations.

[0025] Embodiment 2: As Figure 5 and Figure 9 shown, the regulation mechanism 4 includes a connecting ring 401. A number of electric telescopic rods 403 are evenly distributed at the bottom of the connecting ring 401. The output end of the electric telescopic rod 403 is connected with a sealing sleeve ring 402. The regulation mechanism 4 further includes a sealing sleeve 404 and a liquid inlet hole 405. The sealing sleeve 404 is arranged below the sealing sleeve ring 402. The sealing sleeve ring 402 is hermetically sleeved on the outside of the liquid inlet hole 405. A controller 406 is fixedly installed at the top of the connecting ring 401. A sensing wire 407 is fixedly connected to the side of the controller 406. One end of the sensing wire 407 is fixedly connected with a pressure sensor 408.

[0026] In this embodiment, the connecting ring 401 is mainly used to connect the float shoe with other casing pipes or equipment. By cooperating with the corresponding components, it ensures the fixed position of the float shoe in the entire casing system, forms a stable connection between components, and maintains the overall structural stability of the oil extraction equipment. The sealing sleeve ring 402 and the sealing sleeve 404 work together to provide a sealing function for the float shoe. It can be installed at the connection part and closely fit with the corresponding components to prevent leakage of cement slurry, formation fluid, etc. from the connection gap under high-pressure environment, effectively isolate the inside and outside of the float shoe, and improve the sealing performance and overall performance of the float shoe. The liquid inlet hole 405 is the channel for fluids such as cement slurry to enter the inside of the float shoe. During the cementing operation, the cement slurry flows into the annular space between the casing and the formation through the liquid inlet hole to achieve the cementing function. Its size, quantity, and distribution will affect the inflow rate and uniformity of the cement slurry, and thus affect the cementing quality. The electric telescopic rod 403 performs telescopic actions under the control of the controller 406. By changing its own length, the position or pressure of components such as the sealing sleeve ring 402 is adjusted, thereby controlling the opening degree or sealing state of the liquid inlet hole 405 to achieve precise control of the fluid flow rate to meet the requirements of different cementing operations. The pressure sensor 408 monitors the pressure changes inside or outside the float shoe in real time and transmits the pressure data to the controller 406 through the sensing line 407. It provides data support for the pressure state monitoring of the float shoe, so as to timely detect abnormal pressures and take corresponding measures to ensure the safe and stable operation of the float shoe. The sensing line 407, as a signal transmission medium, is responsible for accurately transmitting the pressure signal detected by the pressure sensor 408 to the controller 406, ensuring the stability and accuracy of the pressure data transmission, enabling the controller to make correct judgments and instructions based on the pressure data. The controller 406 receives the pressure data transmitted by the pressure sensor 408 through the sensing line 407, analyzes and processes it. According to the preset program and pressure threshold, it controls the action of the electric telescopic rod 403 to achieve intelligent control of the liquid inlet hole 405, adjust the fluid flow rate, and ensure the normal operation of the float shoe under different working conditions.

[0027] Embodiment 3: As Figure 7 , Figure 8 and Figure 10As shown, the first docking sealing mechanism 5 includes a sealing mounting ring 501. A sliding groove 502 is formed on the outer side of the sealing mounting ring 501. A connecting collar 503 is slidably connected to the outer side of the sliding groove 502. A first sealing soft sleeve 504 is provided at the top of the connecting collar 503. A docking collar 505 is connected to the top of the first sealing soft sleeve 504. The sealing mounting ring 501 is arranged at the top of the corrosion-resistant sleeve 201. An inner support ring 506 and inner support spokes 507 are arranged on the inner side of the sealing mounting ring 501. The inner support spokes 507 are distributed on the inner support ring 506. The second docking sealing mechanism 6 includes a connecting socket 601. A connecting snap ring 602 is sleeved on the outer side of the connecting socket 601. A second sealing soft sleeve 603 is connected to the bottom of the connecting snap ring 602. A docking snap ring 604 is connected to the bottom of the second sealing soft sleeve 603. First steel rings 605 and second steel rings 606 are respectively arranged at the upper and lower ends on the inner side of the second sealing soft sleeve 603. The bottom of the first steel ring 605 is arranged at the bottom of the connecting snap ring 602. The second steel ring 606 is connected to the top of the docking snap ring 604.

[0028] In this embodiment, the sealing mounting ring 501 serves as the basic mounting component, providing a mounting and positioning reference for other components of the first docking sealing mechanism, ensuring that each sealing component is accurately installed in its corresponding position, and guaranteeing the overall assembly accuracy and sealing performance of the sealing mechanism. The sliding groove 502 provides a sliding track for components such as the connecting collar 503, enabling related components to slide smoothly in a specified direction, realizing actions such as telescoping and adjustment during the docking process of the sealing mechanism to adapt to different docking requirements and sealing requirements. The connecting collar 503 plays a role in connecting and transmitting forces and can be connected to other components. During the docking process, by sliding in the sliding groove 502, it drives components such as the first sealing soft sleeve 504 to adjust their positions, realizing the docking and sealing functions of the sealing mechanism. The first sealing soft sleeve 504 is usually made of materials with elasticity and corrosion resistance. During docking, it can closely adhere to the surface of the docking component, fill the gaps, form a sealing barrier, and prevent fluid leakage. It is a key component for realizing the sealing function. The docking collar 505 is used for docking and mating with other components. During the docking process, it fits or adheres to the corresponding docking structure, guiding the docking process to proceed accurately. At the same time, it works together with the first sealing soft sleeve 504 and others to enhance the sealing effect. The inner support ring 506 and the inner support spokes 507 play a role in supporting the first sealing soft sleeve 504, keeping it in a specific shape, and ensuring that the sealing soft sleeve can effectively perform the sealing function during docking and sealing. The inner support spokes extend from the inner support ring towards the interior, further enhancing the support for the sealing soft sleeve, dispersing the pressure, and improving the stability and reliability of the sealing structure. The connecting seat 601 and the connecting snap ring 602 provide a mounting foundation. The connecting snap ring can cooperate with the corresponding slot or snap structure on other components to achieve rapid and firm connection of the second docking sealing mechanism with other components, ensuring the stable position of the sealing mechanism during operation. The second sealing soft sleeve 603 is similar in function to the first sealing soft sleeve and is made of materials with good elasticity and corrosion resistance. During docking, it closely adheres to the docking surface, preventing fluid leakage. It is the core component for the second docking sealing mechanism to realize the sealing function. The docking snap ring 604 is used for docking and locking with the corresponding component. During the docking process, it cooperates with the engaging structure of other components to achieve accurate docking and firm connection, and at the same time assists the second sealing soft sleeve 603 to enhance the sealing effect. The first steel ring 605 and the second steel ring 606 usually have relatively high strength and rigidity. They are installed inside or at the edge of the sealing soft sleeve, playing a role in enhancing the strength of the sealing structure, preventing excessive deformation of the sealing soft sleeve, and also helping to evenly distribute the pressure, improving the overall sealing performance and reliability of the sealing mechanism.

[0029] In the present invention, when the high-pressure resistant and corrosion-resistant integrated float shoe is in use, first of all, during the lowering process of the casing, the float shoe guide cap 101 is located at the front end of the float shoe and can be the first to contact the formation. Its special streamline design can reduce the lowering resistance, guide the casing to smoothly enter the predetermined position, and at the same time protect the internal structure of the float shoe from possible collision damage during the lowering process. The flower basket 102 plays a role in filtering and dispersing fluids. When cement slurry is injected or formation fluids flow, the mesh or grid structure of the flower basket 102 can filter out larger particle impurities, preventing them from blocking the liquid inlet holes or affecting the operation of internal components; at the same time, it evenly disperses the fluids, ensuring that the cement slurry evenly flows into the annular space between the casing and the formation, and improving the cementing quality. The ball rod 103 works in cooperation with the sealing ball 106. The ball rod 103 can serve as a connecting rod for operating the sealing ball 106. When it is necessary to close the liquid inlet channel, such as preventing the backflow of cement slurry, through the internal pressure change, the ball rod 103 is pushed to move, and then the position of the sealing ball 106 is controlled to achieve the opening and closing of the channel. The sleeve 104 provides support and protection for internal components on the one hand, wrapping components such as the ball rod 103 and the spring 105 to protect them from external corrosive media; on the other hand, it plays a role in connection and positioning, ensuring the accurate installation position of other components and maintaining the stability of the overall structure of the float shoe. The spring 105 cooperates with the sealing ball 106 to achieve the automatic sealing function. When the cement slurry normally flows in, the pressure pushes the sealing ball to overcome the spring force to open the channel; when the injection of the cement slurry is completed or the pressure changes abnormally, the spring 105 rebounds, pushing the sealing ball 106 to reset and blocking the liquid inlet to prevent the backflow of the cement slurry and ensure the smooth progress of the cementing operation. The sealing ball 106 is the key component for controlling the opening and closing of the liquid inlet channel. Under the action of the spring 105 and the ball rod 103, the sealing ball 106 can closely fit at the liquid inlet to form an effective seal, preventing the reverse flow of the cement slurry or formation fluids and ensuring the one-way conduction function of the float shoe. During the lowering process of the casing, the resistance plate 107 provides additional resistance by increasing the contact area with the well fluids, helping to stabilize the lowering speed of the casing and avoiding collisions or damages caused by excessive lowering speed; during cementing, it can also adjust the flow rate and flow direction of the cement slurry around the float shoe to make it more evenly distributed. The threaded casing 108 is used to connect the float shoe with other casings or equipment. Through threaded connection, the firmness and sealing performance of the connection are ensured, ensuring that in a high-pressure and highly corrosive environment, the float shoe is tightly combined with the entire casing system and works together to maintain the normal operation of oil extraction operations.

[0030] The corrosion-resistant casing 201 is the main protective structural component of the float shoe and is made of corrosion-resistant materials. Its main function is to protect the internal components from the corrosion of corrosive media such as hydrogen sulfide, carbon dioxide, and high-salinity formation water in the oil production environment. At the same time, it provides a basic pressure-bearing structure for the float shoe to ensure that the float shoe can withstand a certain pressure underground and maintain the overall shape stability. The sealing top ring 202, the sealing pressure ring 203, the sealing outer ring 204 and the sealing inner ring 205 together constitute a multi-stage sealing structure. The sealing top ring and the sealing pressure ring cooperate to apply pressure during installation to make the sealing outer ring and the sealing inner ring elastically deformed, tightly fit on the sealing surfaces such as the inner wall and outer wall of the casing, prevent the leakage of media such as cement slurry and formation fluid, enhance the sealing performance of the float shoe, and ensure the smooth progress of cementing operations. The sealing bottom groove 206 provides an installation and positioning space for the bottom sealing component of the sealing ring 207, ensures that the bottom sealing structure is accurately installed, and cooperates with other sealing components to form a complete sealing system to prevent fluid leakage from the bottom of the float shoe. The sealing ring 207 has good elasticity and is installed in the sealing bottom groove and other positions. Under pressure, it can tightly fill the gap. It is a key component to prevent fluid leakage at the bottom of the float shoe and enhance the bottom sealing effect. The clamping ring 208 applies radial pressure and cooperates with the sealing structure to make the sealing component better fit the sealing surface, further enhancing the sealing effect. At the same time, it can also play a certain role in fixing and supporting the internal structure to maintain the relative position stability of the internal components of the float shoe. The notch 209 cooperates with the protrusions, blocks and other structures of other components for positioning, installation and connection between components, ensuring accurate assembly of each component and making the float shoe structure compact and stable. The plug-in rod 210 can be inserted into the plug-in slot 211 to achieve rapid connection or positioning between components, facilitate assembly and disassembly, and prevent relative rotation or axial movement of components after installation to ensure the stability of the overall structure of the float shoe.

[0031] The high-pressure-resistant support spokes 301 extend radially outward from the center of the floating shoe to the inner wall or other supporting structures, mainly bearing the high-pressure force from the outside and evenly distributing the pressure to various parts of the floating shoe. In high-pressure environments such as the deep sea, the external pressure is huge. The support spokes can effectively prevent the floating shoe from being deformed due to excessive local pressure through their own high-strength materials and reasonable layout, maintain the stability of the overall structure of the floating shoe, ensure the integrity of its internal space, and ensure the normal operation of internal components. The high-pressure-resistant support ring 302 is usually annular in structure, surrounding a specific position inside the floating shoe, such as near the bottom or at different height intervals. It plays the role of annular support and cooperates with the high-pressure-resistant support spokes. When the floating shoe is subjected to external high pressure, the support ring can resist the radial deformation caused by the pressure and prevent the floating shoe from shrinking or expanding in the circumferential direction under the pressure. The high-pressure-resistant cross braces 303 are arranged in the internal space of the floating shoe in a cross form, connecting the support spokes or support rings at different positions to form a stable mesh support system. This cross structure greatly enhances the stability and integrity of the internal support structure of the floating shoe.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high pressure resistant and corrosion resistant integrated floating shoe, characterized by: The invention comprises a floating shoe mechanism (1), an anti-corrosion mechanism (2), a high pressure resistance mechanism (3), a regulating mechanism (4), a first docking sealing mechanism (5) and a second docking sealing mechanism (6), wherein the floating shoe mechanism (1) comprises a floating shoe guide cap (101), the anti-corrosion mechanism (2) comprises an anti-corrosion casing (201), a sealing pressure ring (203) is arranged at the top of the anti-corrosion casing (201), a sealing bottom groove (206) is provided at the bottom of the sealing bottom groove (206), a sealing ring (207) is arranged at the bottom of the sealing bottom groove (206), and the sealing ring (207) is arranged at the bottom of the sealing bottom groove (206). 7) is pressed with a clamping ring (208) at the bottom, a sealing outer ring (204) and a sealing inner ring (205) are arranged at the bottom of the sealing clamping ring (203), a sealing top ring (202) is arranged between the sealing outer ring (204) and the sealing inner ring (205), a notch (209) is opened around the bottom of the clamping ring (208), an insertion rod (210) is arranged around the bottom of the sealing ring (207), an insertion groove (211) is opened around the top of the clamping ring (208), and the insertion rod (210) is connected to the inner side of the insertion groove (211); The high-pressure resistant mechanism (3) comprises a plurality of high-pressure resistant support spokes (301), a plurality of high-pressure resistant support rings (302) are evenly distributed on the high-pressure resistant support spokes (301), a plurality of high-pressure resistant cross braces (303) are distributed between two adjacent high-pressure resistant support spokes (301), and the high-pressure resistant cross braces (303) and the high-pressure resistant support rings (302) are staggeredly distributed.

2. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 1 is characterized in that: The regulating mechanism (4) comprises a connecting ring (401), a plurality of electric telescopic rods (403) are evenly distributed on the bottom of the connecting ring (401), and the output ends of the electric telescopic rods (403) are connected to sealing collars (402).

3. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 2 is characterized in that: The regulating mechanism (4) further comprises a sealing ring (404) and a liquid inlet hole (405); the sealing ring (404) is arranged below the sealing ring (402); and the sealing ring (402) is sealingly sleeved on the outside of the liquid inlet hole (405).

4. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 3 is characterized in that: A controller (406) is fixedly mounted on the top of the connection ring (401), a sensing line (407) is fixedly connected to the side of the controller (406), and one end of the sensing line (407) is fixedly connected to a pressure sensor (408).

5. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 1 is characterized in that: The first docking sealing mechanism (5) comprises a sealing installation ring (501), a sliding groove (502) is provided on the outer side of the sealing installation ring (501), and a connecting ring (503) is slidably connected to the outer side of the sliding groove (502).

6. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 5 is characterized in that: A first sealing soft sleeve (504) is arranged on the top of the connecting sleeve (503), a docking sleeve (505) is connected to the top of the first sealing soft sleeve (504), and the sealing installation ring (501) is arranged on the top of the corrosion-resistant sleeve (201).

7. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 6 is characterized in that: An inner support ring (506) and inner support spokes (507) are arranged on the inner side of the sealing installation ring (501), and the inner support spokes (507) are distributed on the inner support ring (506).

8. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 1 is characterized in that: The second docking sealing mechanism (6) comprises a connecting card seat (601), a connecting clamp ring (602) is sleeved on the outer side of the connecting card seat (601), a second sealing soft sleeve (603) is connected to the bottom of the connecting clamp ring (602), and a docking clamp ring (604) is connected to the bottom of the second sealing soft sleeve (603).

9. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 8 is characterized in that: A first steel ring (605) and a second steel ring (606) are disposed at both upper and lower ends of the inner side of the second sealing soft sleeve (603); the bottom of the first steel ring (605) is disposed at the bottom of the connecting clamp ring (602), and the second steel ring (606) is connected to the top of the docking clamp ring (604).

10. The high pressure resistant and corrosion resistant integrated floating shoe according to claim 1, characterized in that: A flower basket (102) is arranged at the top of the inner side of the float shoe guide cap (101), a ball rod (103) penetrates the inner side of the flower basket (102), a sleeve (104) is arranged at the inner side of the float shoe guide cap (101), the sleeve (104) is arranged at the bottom of the flower basket (102), a spring (105) is arranged at the outer side of the ball rod (103), a sealing ball (106) is connected to the bottom of the ball rod (103), a resistance plate (107) is arranged at the bottom of the sleeve (104), the bottom of the sealing ball (106) is movably docked on the resistance plate (107), and a threaded sleeve (108) is arranged at the inner bottom of the float shoe guide cap (101).

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