An impact-breaking casing suspension assembly

Abstract

This invention provides an impact-breaking casing suspension assembly, comprising a fracture plate, an impact sleeve, a lower cylinder, a shear pin, an upper cylinder, a shear sleeve, an elastic retaining ring, a spacer, and a spring. The upper and lower cylinders are connected. The impact sleeve is coaxially fitted inside the upper cylinder, with its lower end connected to the lower cylinder and its upper end connected to the shear sleeve. The outer wall of the shear sleeve is in close contact with the inner wall of the upper cylinder. A shear pin connects the shear sleeve and the impact sleeve, providing axial positioning. The fracture plate is located inside the upper cylinder and above the shear sleeve. The spacer is located inside the upper cylinder above the fracture plate. The spring is located within the annular space formed by the upper cylinder and the spacer. The elastic retaining ring is located above the spring. In this invention, the chip-bearing floating collar can significantly reduce the impact of residual fractured particles on cementing, improving cementing quality.

Description

Technical Field

[0001] This invention relates to the field of oil drilling tools, and more specifically to an impact-breaking casing suspension assembly. Background Technology

[0002] In oilfield drilling and completion operations, the frictional resistance encountered by the wellbore during casing string running is a significant factor affecting casing running efficiency. Casing suspenders are important tools for reducing casing running friction and are widely used in casing running in highly deviated and horizontal wells.

[0003] The latest casing suspension system is the fractured plate type. Existing casing suspension system assemblies suffer from problems such as inadequate cementing quality due to fragments remaining inside the casing caused by the fractured plate. Furthermore, the fractured plate leaves annular grooves in the casing suspension's inner bore, making it difficult or impossible for logging crawlers to pass through during subsequent logging operations, delaying timelines and impacting oilfield production capacity. Summary of the Invention

[0004] To overcome the problems of existing casing suspension assemblies where residual fragments from fractured plates inside the casing prevent proper cementing, leading to substandard cementing quality, delays, and reduced productivity, this invention provides an impact-breaking casing suspension assembly. This assembly eliminates annular grooves after the fractured plate breaks, ensuring smooth passage for the logging crawler and significantly improving logging efficiency. Simultaneously, the chip-bearing floating collar greatly reduces the impact of residual fractured particles on cementing pressure, further improving cementing quality.

[0005] The technical solution adopted in this invention is as follows: An impact-breaking sleeve suspension assembly includes a fracture plate, an impact sleeve, a lower cylinder, a shear pin, an upper cylinder, a shear sleeve, an elastic retaining ring, a spacer, and a spring. The upper and lower cylinders are connected. The impact sleeve is coaxially fitted inside the upper cylinder, with its lower end connected to the lower cylinder and its upper end connected to the shear sleeve. The outer wall of the shear sleeve is in close contact with the inner wall of the upper cylinder. A shear pin is provided between the shear sleeve and the impact sleeve, connecting and axially limiting them. The fracture plate is located inside the upper cylinder and above the shear sleeve. The spacer is located inside the upper cylinder above the fracture plate. The spring is located within the annular space formed by the upper cylinder and the spacer. The elastic retaining ring is located at the upper end of the spring.

[0006] The impact sleeve includes an impact sleeve body, a striker, a threaded hole, and a compensation groove. The impact sleeve body is a hollow cylinder. One end of the impact sleeve body has an outer stepped hole, and the threaded hole is radially located on the side wall of the outer stepped hole. The striker is located at the end of the impact sleeve body with the outer stepped hole, and the compensation groove is located at the other end of the impact sleeve body. A compensation pad is provided inside the compensation groove.

[0007] There are four impact pins, which are evenly distributed around the impact sleeve body. The impact pins are integrally formed with the impact sleeve body and point towards the fracture plate. The shear pins pass through the threaded hole and are connected to the shear sleeve.

[0008] The lower cylinder has two outer stepped platforms at its upper end, with a sealing groove on the upper stepped surface and an external thread on the lower stepped surface. The non-impact pin end of the impact sleeve is axially limited to the top surface of the lower cylinder's steps. The upper cylinder has an inner stepped hole at its lower end, and an internal thread at its lowest end, which connects to the external thread at the upper end of the lower cylinder. The lower part of the stepped surface with the inner stepped hole at the lower end of the upper cylinder is sealed to the stepped surface at the upper end of the lower cylinder.

[0009] The shear sleeve is positioned closer to the rupture plate than the impact sleeve, and the spacer and rupture plate are axially limited; the axial dimension of the shear sleeve is smaller than the outer diameter axial dimension of the impact sleeve on the side closer to the rupture plate, and the inner diameters of the upper cylinder, the impact sleeve, and the lower cylinder are the same.

[0010] The outer wall of the shear sleeve is provided with a sealing ring, wherein the sealing ring seals the contact point between the shear sleeve and the upper cylinder, and an end face sealing ring is provided between the shear sleeve and the rupture plate, wherein the end face sealing ring seals the contact point between the shear sleeve and the rupture plate.

[0011] The lower end of the upper cylinder is connected to a float hoop, which includes a float hoop shell, a float hoop pressing seat, a float hoop basket, a float hoop valve, and a float hoop spring. The float hoop basket is located inside the float hoop shell, and the float hoop shell is connected to the float hoop basket by threads. One end of the float hoop basket is connected to the float hoop pressing seat by threads. The float hoop valve is fitted into the bottom hole of the float hoop basket, and the float hoop spring is fitted onto the float hoop valve shaft.

[0012] The spring mentioned is a return spring or a leaf spring.

[0013] The spacer sleeve is a cylinder with a large outer diameter at one end and a small outer diameter at the other end. Multiple arc-shaped grooves are opened on the end with the large outer diameter, and the arc-shaped grooves are set to correspond to the impact pins on the impact sleeve. The end of the spacer sleeve with the small outer diameter is located inside the inner wall of the smallest inner diameter of the upper cylinder, and the end of the spacer sleeve with the large outer diameter is located on the inner step surface at the lower end of the upper cylinder. A cavity is formed between the inner step surface at the lower end of the upper cylinder and the spacer sleeve.

[0014] The spacer is a cylinder with a large outer diameter at one end and a small outer diameter at the other end, with a chamfered groove at the end with the large outer diameter.

[0015] The beneficial effects of this invention are as follows: In this invention, the spacer is designed as a cylinder with a large outer diameter at one end and a small outer diameter at the other. The end with the smaller outer diameter is located within the inner wall of the upper cylinder at its smallest inner diameter, while the end with the larger outer diameter is located on the inner stepped surface at the lower end of the upper cylinder. A cavity is formed between the inner stepped surface at the lower end of the upper cylinder and the spacer. A spring and an elastic retaining ring are installed within this cavity, providing cushioning during the downward movement of the spacer. In this invention, the end with the larger outer diameter of the spacer has a chamfered groove or an arc-shaped groove. The arc-shaped groove corresponds to the impact pin on the impact sleeve, used to fit the impact pin and further protect it.

[0016] In this invention, the shear pin is connected to the threaded hole of the shear sleeve and the threaded hole of the impact sleeve respectively. At the same time, the relative position of the shear sleeve and the impact sleeve is defined by the shear pin, thereby indirectly determining the distance between the impact pin head and the fracture plate. The inner hole of the upper cylinder and the shear sleeve are sealed by the shear sleeve sealing ring, and the shear sleeve and the fracture plate are sealed by the end face sealing ring, so that the fracture plate isolates the air column and the drilling fluid column in the unbroken state.

[0017] In this invention, the compensation pad is used to adjust the pre-tightening pressure on the fracture plate during axial positioning.

[0018] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the impact-breaking casing suspension assembly.

[0020] Figure 2 This is a schematic diagram showing the detailed structure of the connection between the impact sleeve and the shear sleeve.

[0021] Figure 3 This is an enlarged schematic diagram of the internal structure of the impact-breaking casing suspension assembly.

[0022] Figure 4 This is an enlarged schematic diagram of the internal structure of an impact-breaking sleeve suspension assembly with an arc-shaped groove at the lower end of the spacer.

[0023] Figure 5 An enlarged schematic diagram of the internal structure of an impact-breaking sleeve suspension assembly with leaf springs.

[0024] Figure 6 This is a schematic diagram of the floating hoop structure.

[0025] In the diagram, the reference numerals are: 1. Fracture plate; 2. Impact sleeve; 3. Lower cylinder; 4. Shear pin; 5. Upper cylinder; 6. Shear sleeve; 7. Elastic retaining ring; 8. Spacer; 9. Spring; 10. Floating hoop; 101. Floating hoop outer shell; 102. Floating hoop pressing seat; 103. Floating hoop sealing ring one; 104. Floating hoop sealing ring two; 105. Floating hoop basket; 106. Floating hoop valve; 107. Floating hoop spring; 2-1. Strike pin; 2-2. Threaded hole; 2-3. Compensation groove; 2-4. Compensation pad; 6-1. Sealing ring one; 6-2. End face sealing ring; 8-1, Spacer hole; 8-2, Arc groove; 8-3, Chamfered groove; 9-1. Return spring; 9-2. Leaf spring. Detailed Implementation

[0026] Example 1: To overcome the problems of existing casing suspension assemblies, such as the inability to properly pressurize the casing during cementing due to residual fragments from fractured plates, resulting in substandard cementing quality, delays, and reduced productivity, this invention provides... Figure 1-6 The invention presents an impact-fracture type casing suspension assembly. After the fracture plate breaks, there is no annular groove, ensuring smooth passage for the logging crawler and significantly improving the efficiency of logging measurements. Simultaneously, the chip-bearing floating collar greatly reduces the impact of residual fractured particles on cementing, improving cementing quality.

[0027] An impact-breaking sleeve suspension assembly includes a fracture plate 1, an impact sleeve 2, a lower cylinder 3, a shear pin 4, an upper cylinder 5, a shear sleeve 6, an elastic retaining ring 7, a spacer 8, and a spring 9. The upper cylinder 5 and the lower cylinder 3 are connected. The impact sleeve 2 is coaxially fitted inside the upper cylinder 5. The lower end of the impact sleeve 2 is connected to the lower cylinder 3, and the upper end of the impact sleeve 2 is connected to the shear sleeve 6. The outer wall of the shear sleeve 6 is in close contact with the inner wall of the upper cylinder 5. A shear pin 4 is provided between the shear sleeve 6 and the impact sleeve 2, connecting the shear sleeve 6 and the impact sleeve 2 and axially limiting their movement. The fracture plate 1 is located inside the upper cylinder 5 and above the shear sleeve 6. The spacer 8 is located inside the upper cylinder 5 above the fracture plate 1. The spring 9 is located within the annular space formed by the upper cylinder 5 and the spacer 8. The elastic retaining ring 7 is located at the upper end of the spring 9.

[0028] like Figure 1 and Figure 2As shown, in this invention, the shear sleeve 6 is radially fixed to the upper cylinder 5, the non-impact pin end of the impact sleeve 2 and the joint step surface of the lower cylinder 3 are axially limited, the upper cylinder 5 and the lower cylinder 3 are connected by threads, the impact sleeve 2 and the upper cylinder 5 are radially limited, and the shear sleeve 6 and the impact sleeve 2 are connected and axially limited by shear pins 4. When the pump is started and pressurized at the wellhead, when the sum of the pump start pressure and the hydrostatic column is greater than the shearing pressure of the shear pin 4, the shear pin 4 is sheared, and the fracture plate 1 instantly impacts the four impact pins 2-1 of the impact sleeve 2. The fracture plate 1 is completely shattered. After shattering, the spring 9 pushes the spacer 8 downward a certain distance, thereby closing the annular groove formed after the fracture plate 1 is broken. During the closing process, the remaining fragments in the annular groove can be cleaned. The cleaned fragments are discharged with the drilling fluid and the casing string channel is opened. Grouting continues to completely separate the gas and liquid. After the air column is completely discharged from the wellbore, subsequent operations are carried out.

[0029] Example 2: Based on Embodiment 1, in this embodiment, preferably, the impact sleeve 2 includes an impact sleeve body, an impact pin 2-1, a threaded hole 2-2, and a compensation groove 2-3. The impact sleeve body is a hollow cylinder, and one end of the impact sleeve body has an outer stepped hole. The threaded hole 2-2 is radially disposed on the side wall of the outer stepped hole. The impact pin 2-1 is disposed at the end of the impact sleeve body with the outer stepped hole, and the compensation groove 2-3 is disposed at the other end of the impact sleeve body. A compensation pad 2-4 is disposed inside the compensation groove 2-3.

[0030] In this invention, the compensation pad 2-4 is used to adjust the pre-tightening pressure on the fracture plate 1 during axial positioning. The outer wall of the impact sleeve 2 has a stepped structure, with a smaller outer diameter on the side of the impact sleeve 2 closer to the fracture plate 1 and a larger outer diameter on the side of the impact sleeve 2 closer to the lower cylinder 3. The compensation pad 2-4 is provided at the stepped joint surface between the impact sleeve 2 and the lower cylinder 3, wherein the compensation groove 2-3 is provided on the end face of the impact sleeve 2 closer to the lower cylinder 3, and the compensation pad 2-4 is located inside the compensation groove 2-3. The axial position of the compensation pad 2-4 is closer to the lower cylinder 3 than the axial position of the impact sleeve 2.

[0031] Preferably, there are four impact pins 2-1, which are evenly arranged circumferentially at the impact pin end of the impact sleeve body. The impact pins 2-1 are integrally formed with the impact sleeve body and point towards the fracture plate 1. The shear pin 4 passes through the threaded hole 2-2 and is connected to the shear sleeve 6.

[0032] Preferably, the lower cylinder 3 has two outer stepped platforms at its upper end, with a sealing groove on the upper stepped surface; the lower stepped surface has an external thread; the non-impact pin end of the impact sleeve 2 is axially limited to the top surface of the step of the lower cylinder 3; the upper cylinder 5 has an inner stepped hole at its lower end, and the lowest end of the upper cylinder 5 has an internal thread that connects with the external thread at the upper end of the lower cylinder 3; the lower part of the stepped surface with the inner stepped hole at the lower end of the upper cylinder 5 is sealed to the stepped surface at the upper end of the lower cylinder 3.

[0033] Preferably, the axial position of the shear sleeve 6 is closer to the fracture plate 1 than the axial position of the impact sleeve 2, and the spacer 8 and the fracture plate 1 are axially limited; the axial dimension of the shear sleeve 6 is smaller than the outer diameter axial dimension of the impact sleeve 2 on the side closer to the fracture plate 1, and the inner diameters of the upper cylinder 5, the impact sleeve 2 and the lower cylinder 3 are the same.

[0034] In this invention, the inner diameters of the upper cylinder 5, the impact sleeve 2, and the lower cylinder 3 are the same, ensuring the consistency of the overall diameter. The impact pin end of the impact sleeve 2 faces upward, is the upper end and close to the fracture plate 1, and the impact pin end of the impact sleeve 2 is located inside the lower end of the shear sleeve 6.

[0035] Preferably, the outer wall of the shear sleeve 6 is provided with a sealing ring 6-1, wherein the sealing ring 6-1 seals the contact point between the shear sleeve 6 and the upper cylinder 5, and an end face sealing ring 6-2 is provided between the shear sleeve 6 and the rupture plate 1, wherein the end face sealing ring 6-2 seals the contact point between the shear sleeve 6 and the rupture plate 1.

[0036] Preferably, the spring 9 is a return spring 9-1 or a leaf spring 9-2.

[0037] In this invention, the return spring 9-1 or leaf spring 9-2 is selected to ensure that the spacer 8 can promptly fill the annular channel formed after the fracture plate 1 is broken. Simultaneously, the elastic retaining ring 7 limits the downward distance of the spacer 8, preventing the striking pin 2-2 from impacting the bottom of the spacer 8. Preferably, in this invention, one end of the leaf spring 9-2 is fixed to the inner wall of the spacer 8 with a screw, and the other end is connected to the upper cylinder 5 at the elastic retaining ring 7.

[0038] In this invention, preferably, one end of the return spring 9-1 is connected to the upper cylinder 5 at the elastic retaining ring 7, and the other end is connected to the bottom surface of the inner step of the spacer 8.

[0039] Preferably, the spacer 8 is a cylinder with a large outer diameter at one end and a small outer diameter at the other end. The end with the large outer diameter has multiple arc-shaped grooves 8-2, which are corresponding to the striking pins 2-1 on the impact sleeve 2. The end with the small outer diameter of the spacer 8 is located inside the inner wall of the smallest inner diameter of the upper cylinder 5, and the end with the large outer diameter of the spacer 8 is located on the inner step surface at the lower end of the upper cylinder 5. A cavity is formed between the inner step surface at the lower end of the upper cylinder 5 and the spacer 8.

[0040] Preferably, the spacer 8 is a cylinder with a large outer diameter at one end and a small outer diameter at the other end, with a chamfered groove 8-3 at the end with the large outer diameter. In this invention, the spacer 8 is designed with the above-mentioned structure so that a cavity can be formed between it and the inner step at the lower end of the upper cylinder 5. A return spring 9-1 or a leaf spring 9-2 is provided in the cavity to promptly fill the annular channel formed after the fracture plate 1 is broken.

[0041] In this invention, a chamfered groove 8-3 is provided at the lower end of the spacer 8 for fitting the firing pin 2-1.

[0042] In this invention, in order to better fit the firing pin 2-1, an arc-shaped groove 8-2 corresponding to the firing pin 2-1 is provided at the lower end of the spacer 8. The four firing pins 2-1 enter the arc-shaped groove 8-2 in a one-to-one correspondence, which protects the firing pin 2-1 and further eliminates the annular channel.

[0043] In this invention, such as Figure 2 As shown, the shear pin 4 is connected to the threaded holes of the shear sleeve 6 and the impact sleeve 2 respectively. Simultaneously, the shear pin 4 limits the relative position of the shear sleeve 6 and the impact sleeve 2, thereby indirectly determining the distance between the head of the impact pin 2-1 and the fracture plate 1. The sealing ring 6-1 of the shear sleeve 6 seals the inner hole of the upper cylinder 5 and the shear sleeve 6, and the end face sealing ring 6-2 seals the shear sleeve 6 and the fracture plate 1, isolating the air column and drilling fluid column of the fracture plate 1 when it is not broken. The compensation pad 2-4 is used to adjust the preload pressure on the fracture plate 1 during axial positioning. The non-impact pin end of the impact sleeve 2 and the joint step surface of the lower cylinder 3 are axially limited. The upper cylinder 5 and the lower cylinder 3 are connected by threads. The impact sleeve 2 and the upper cylinder 5 are radially limited. The shear sleeve 6 and the impact sleeve 2 are connected and axially limited by the shear pin 4. Based on this, according to the different structures of the spring 9 and the spacer 8, the following four working processes are given in this invention: The first type, such as Figure 1 and Figure 2 As shown, the lower end of the spacer 8 has a chamfered groove 8-3.

[0044] When the pump is running, the sum of the pump pressure and the hydrostatic column pressure is greater than the shear pressure, the shear pin 4 is sheared, the shear sleeve 6 is in a free state axially, the cracking plate 1 strikes the impact pin 2-1 axially downward, the cracking plate 1 is broken, the channel is opened, grouting continues to completely separate the gas and liquid, and after the air column is completely discharged from the wellbore, subsequent operations are carried out.

[0045] The second type, such as Figure 3 and Figure 2 As shown, spring 9 is a return spring 9-1, and the lower end of spacer 8 has a chamfered groove 8-3.

[0046] When the pump is running, the sum of the pump pressure and the hydrostatic column pressure is greater than the shear pressure, the shear pin 4 is sheared, the shear sleeve 6 is in a free axial state, the fracture plate 1 strikes the impact pin 2-1 axially downward, the fracture plate 1 is broken, after the fracture, the return spring 9-1 pushes the spacer 8 downward so that the chamfered groove 8-3 of the spacer 8 fits with the impact pin 2-1, at the same time the elastic retaining ring 7 is just embedded in the spacer hole 8-1 to reduce the impact between the chamfered groove of the spacer 8 and the impact pin 2-1, thereby closing the annular groove formed after the fracture plate 1 is broken. During the closing process, the remaining fragments in the annular groove can be cleaned. The cleaned fragments are discharged from the casing string with the drilling fluid, the channel is opened, and grouting continues to completely separate the gas and liquid. After the air column is completely discharged from the wellbore, subsequent operations can be carried out.

[0047] The third type, such as Figure 4 and Figure 2 As shown, spring 9 is a return spring 9-1, and the lower end of spacer 8 is an arc-shaped groove 8-2.

[0048] When the pump is running, the sum of the pump pressure and the hydrostatic column pressure is greater than the shear pressure, the shear pin 4 is sheared, the shear sleeve 6 is in a free state axially, the fracture plate 1 strikes the impact pin 2-1 axially downward, the fracture plate 1 is broken, after the fracture, the return spring 9-1 pushes the spacer 9 downward so that the arc groove 8-2 of the spacer 8 and the impact pin 2-1 fit together, at the same time the elastic retaining ring 7 is just embedded in the spacer hole 8-1 to reduce the impact between the spacer groove, i.e. the arc groove 8-2, and the impact pin 2-1, thereby closing the annular groove formed after the fracture plate 1 is broken. During the closing process, the remaining fragments in the annular groove can be cleaned. The cleaned fragments are discharged from the casing string with the drilling fluid, the channel is opened, and grouting continues to completely separate the gas and liquid. After the air column is completely discharged from the wellbore, subsequent operations can be carried out.

[0049] The fourth type, such as Figure 5 and Figure 2As shown, spring 9 is a leaf spring 9-2, and the lower end of spacer 8 is an arc-shaped groove 8-2. The inner hole of the upper cylinder 5 and shear sleeve 6 are sealed by the sealing ring 6-1 of the shear sleeve 6, and the shear sleeve 6 and the rupture plate 1 are sealed by the end face sealing ring 6-2, thus isolating the air column and drilling fluid column of the rupture plate 1 in the unbroken state. Leaf spring 9-2 is fixed to spacer 8 by screws. Compensation pad 2-4 is used to adjust the preload pressure on rupture plate 1 during axial positioning. In the pump-on state, the sum of pump pressure and hydrostatic column pressure is greater than the shear pressure, shear pin 4 is sheared, shear sleeve 6 is in a free axial state, and rupture plate 1 strikes the impact pin 2-1 axially downwards, rupturing. Plate 1 is shattered. The axial thrust generated by the hydraulic pressure difference after the rupture pushes the spacer down, causing the arc groove 8-2 of the spacer 8 to fit with the impact pin 2-1. At the same time, the elastic retaining ring 7 is just embedded in the spacer hole 8-1 to reduce the impact between the spacer groove, i.e., the arc groove 8-2, and the impact pin 2-1, thereby closing the annular groove formed after the ruptured plate 1 is broken. During the closing process, the remaining fragments in the annular groove can be cleaned. The cleaned fragments are discharged from the casing string with the drilling fluid, the channel is opened, and grouting continues to completely separate the gas and liquid. After the air column is completely discharged from the wellbore, subsequent operations can be carried out.

[0050] Preferably, the casing suspension assembly provided by the present invention is connected to a float hoop 10 at its lower part after entering the well. The upper cylinder 5 is connected to the lower end of the float hoop 10. The float hoop includes a float hoop shell 101, a float hoop pressing seat 102, a float hoop turnbuckle 105, a float hoop valve 106, and a float hoop spring 107. The float hoop turnbuckle 105, the float hoop pressing seat 102, and the float hoop valve 106 are all located inside the float hoop shell 101. The float hoop shell 101 is connected to the float hoop turnbuckle 105 by threads. One end of the float hoop turnbuckle 105 is connected to the float hoop pressing seat 102 by threads. The float hoop valve 106 is fitted into the bottom hole of the float hoop turnbuckle 105. The float hoop spring 107 is fitted onto the shaft of the float hoop valve 106.

[0051] In this invention, such as Figure 6 As shown, the float collar pressing seat 102 and the float collar basket 105 are sealed by the float collar sealing ring 103, and the float collar basket 105 is sealed to the float collar housing 101 by the float collar sealing ring 104. The float collar valve 106 is fitted into the bottom hole of the float collar basket 105, and the float collar spring 107 is fitted onto the shaft of the float collar valve 106. When the pressure on the upper part of the float collar valve 106 is greater than that on the lower part, the hydraulic pressure difference pushes the float collar valve 106 and the float collar spring 107 downward, opening the channel. When the pressure on the upper part of the float collar valve 106 is less than or equal to the pressure on the lower part, the float collar valve 106 remains in its original position, and the channel is closed. The annular space formed by the float collar pressing seat 102 and the float collar housing 101 can accommodate larger particles after the fracture plate 1 is broken, preventing the float collar and the lower tubing from becoming blocked, thus preventing the cementing from being properly pressed.

[0052] In this invention, the float hoop 10 is a chip-bearing upper float hoop, which can significantly reduce the impact of residual fractured particles on cementing and improve cementing quality.

[0053] In this invention, the floating hoop basket 105, the floating hoop valve 106, and the floating hoop pressing seat 102 are all prior art, and will not be further described in this invention.

[0054] This invention provides an impact-fracture type casing suspension assembly that eliminates the annular groove after the fracture plate 1 is broken, ensuring smooth passage of the logging crawler and significantly improving the efficiency of logging measurements. Simultaneously, the chip-bearing floating collar greatly reduces the impact of residual fractured particles on cementing, improving cementing quality.

[0055] The examples above are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention fall within the scope of protection of the present invention. Device structures and method steps not described in detail in this invention are prior art and will not be further described in this invention.

Claims

1. An impact-breaking type casing suspension assembly, characterized in that: The system includes a fracture plate (1), an impact sleeve (2), a lower cylinder (3), a shear pin (4), an upper cylinder (5), a shear sleeve (6), an elastic retaining ring (7), a spacer (8), and a spring (9). The upper cylinder (5) and the lower cylinder (3) are connected. The impact sleeve (2) is coaxially fitted inside the upper cylinder (5). The lower end of the impact sleeve (2) is connected to the lower cylinder (3), and the upper end of the impact sleeve (2) is connected to the shear sleeve (6). The outer wall of the shear sleeve (6) is connected to the inner wall of the upper cylinder (5). Closely attached, a shear pin (4) is provided between the shear sleeve (6) and the impact sleeve (2), the shear pin (4) connects the shear sleeve (6) and the impact sleeve (2) and limits their axial movement; the rupture plate (1) is located inside the upper cylinder (5) and above the shear sleeve (6); the spacer (8) is located inside the upper cylinder (5) at the upper end of the rupture plate (1); the spring (9) is located in the annular space formed by the upper cylinder (5) and the spacer (8); the elastic retaining ring (7) is located at the upper end of the spring (9); The impact sleeve (2) includes an impact sleeve body, an impact pin (2-1), a threaded hole (2-2), and a compensation groove (2-3). The impact sleeve body is a hollow cylinder with an outer stepped hole at one end. The threaded hole (2-2) is radially located on the side wall of the outer stepped hole. The impact pin (2-1) is located at the end of the impact sleeve body with the outer stepped hole, and the compensation groove (2-3) is located at the other end of the impact sleeve body. A compensation pad (2-4) is provided inside the compensation groove (2-3). There are four impact pins (2-1), which are evenly arranged circumferentially at the impact pin end of the impact sleeve body. The impact pins (2-1) are integrally formed with the impact sleeve body, and the impact pins (2-1) point towards the fracture plate (1); the shear pin (4) passes through the threaded hole (2-2) and is connected to the shear sleeve (6); The lower cylinder (3) has two outer stepped platforms at its upper end, and a sealing groove is provided on the upper stepped surface; an external thread is provided on the lower stepped surface; the non-impact pin end of the impact sleeve (2) is axially limited to the top surface of the step of the lower cylinder (3); the upper cylinder (5) has an inner stepped hole at its lower end, and an internal thread is provided at the lowest end of the upper cylinder (5), which is connected to the external thread at the upper end of the lower cylinder (3); the lower part of the step surface with the inner stepped hole at the lower end of the upper cylinder (5) is sealed to the step surface at the upper end of the lower cylinder (3). The shear sleeve (6) is closer to the fracture plate (1) in the axial position than the impact sleeve (2), and the spacer (8) and the fracture plate (1) are axially limited; the axial dimension of the shear sleeve (6) is smaller than the outer diameter axial dimension of the impact sleeve (2) on the side closer to the fracture plate (1), and the inner diameters of the upper cylinder (5), the impact sleeve (2) and the lower cylinder (3) are the same. The spacer (8) is a cylinder with a large outer diameter at one end and a small outer diameter at the other end. Multiple arc-shaped grooves (8-2) are opened on the end with the large outer diameter. The arc-shaped grooves (8-2) are corresponding to the impact pins (2-1) on the impact sleeve (2). The end with the small outer diameter of the spacer (8) is located inside the inner wall of the smallest inner diameter of the upper cylinder (5), and the end with the large outer diameter of the spacer (8) is located on the inner step surface at the lower end of the upper cylinder (5). A cavity is formed between the inner step surface at the lower end of the upper cylinder (5) and the spacer (8).

2. The impact-breaking type casing suspension assembly according to claim 1, characterized in that: The outer wall of the shear sleeve (6) is provided with a sealing ring (6-1), wherein the sealing ring (6-1) seals the contact between the shear sleeve (6) and the upper cylinder (5), and an end face sealing ring (6-2) is provided between the shear sleeve (6) and the rupture plate (1), wherein the end face sealing ring (6-2) seals the contact between the shear sleeve (6) and the rupture plate (1).

3. The impact-breaking type casing suspension assembly according to claim 1, characterized in that: The lower end of the upper cylinder (5) is connected to a float hoop (10). The float hoop (10) includes a float hoop shell (101), a float hoop pressing seat (102), a float hoop basket (105), a float hoop valve (106), and a float hoop spring (107). The float hoop basket (105) is located inside the float hoop shell (101). The float hoop shell (101) is connected to the float hoop basket (105) by threads. One end of the float hoop basket (105) is connected to the float hoop pressing seat (102) by threads. The float hoop valve (106) is fitted in the bottom hole of the float hoop basket (105). The float hoop spring (107) is fitted on the shaft of the float hoop valve (106).

4. The impact-breaking type casing suspension assembly according to claim 1, characterized in that: The spring (9) is a return spring (9-1) or a leaf spring (9-2).

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