Thermal insulation oil casing with double sealing structure is used in offshore oil mining

Abstract

The present invention is aimed at the technical field of oil extraction, and proposes an insulated oil casing with a double sealing structure for offshore oil extraction. The invention comprises a pipe body, an insulating material is arranged on the outside of the pipe body, the pipe body is provided with a first slide groove evenly distributed in the circumference, a leveling member is slidably connected in the first slide groove, the leveling member penetrates the side of the adjacent first slide groove close to the axis of the pipe body, the pipe body is provided with a second slide groove evenly distributed in the circumference, a transmission member is slidably connected in the second slide groove, the transmission member penetrates between the adjacent second slide groove and the adjacent first slide groove, the transmission member is slidably connected to the adjacent leveling member, and a third slide groove is arranged in the pipe body. The present invention makes the thread on the lower side of the pipe body to be connected contact with the thread on the upper side of the pipe body on the upper side of the connecting body when the axis of the pipe body to be connected is in line with the axis of the connecting body, thereby avoiding the damage of the thread when the pipe body to be connected is connected due to the angle between the pipe body to be connected and the connecting body.

Description

Technical Field

[0001] The invention relates to the technical field of oil exploitation, in particular to a heat-insulating oil casing with a double sealing structure for offshore oil exploitation. Background Art

[0002] In order to protect the oil pipeline during the oil transportation process, a layer of oil casing is generally erected on the outer wall of the oil pipeline to protect the oil pipeline so as to improve the durability and corrosion resistance of the oil pipeline. Before the oil casing is placed in the oil well, it is necessary to connect the oil casing. The oil casing is generally provided with internal threads and external threads for connecting two oil casings. When the oil casing is connected, the main body to be connected (hereinafter referred to as the "connection main body") is fixed by mechanical equipment, and then the oil casing to be connected is lifted by mechanical equipment, and then the mechanical equipment is controlled to move the oil casing to be connected to the top of the connection main body. Then put down the oil casing to be connected, and then rotate the oil casing to be connected, so that the two are threadedly connected. However, in this process, the oil casing to be connected is tilted due to wind and other reasons, and it is impossible to ensure that the axis of the oil casing to be connected is in line with the axis of the connecting body. During offshore oil production, the oil casing to be connected is often blown by sea breeze to tilt it. When the oil casing to be connected is threadedly connected with the connecting body, if the axes of the two are not in line, the threads at the connection between the two will be damaged. After the threads of the two are damaged, the oil casing cannot be used, affecting the progress of oil production. Summary of the invention

[0003] The present invention provides a thermal insulation oil casing with a double sealing structure for offshore oil exploitation, aiming to overcome the shortcomings mentioned in the above background technology.

[0004] Technical solution: A thermal insulation oil casing with a double sealing structure for offshore oil mining, including a pipe body, an insulating material is arranged on the outer side of the pipe body, the pipe body is provided with a first slide groove evenly distributed in the circumferential direction, a leveling member is slidably connected in the first slide groove, the leveling member penetrates the side of the adjacent first slide groove close to the axis of the pipe body, the pipe body is provided with a second slide groove evenly distributed in the circumferential direction, a transmission member is slidably connected in the second slide groove, the transmission member penetrates between the adjacent second slide groove and the adjacent first slide groove, the transmission member is slidably connected to the adjacent leveling member, a third slide groove is arranged in the pipe body, a transmission ring is slidably connected in the third slide groove, a circumferentially evenly distributed limit pin is fixedly connected to the side of the transmission ring close to the circumferentially evenly distributed transmission member, the limit pin penetrates between the third slide groove and the adjacent second slide groove, the limit pin is extruded and matched with the adjacent transmission member, and the second slide groove is located at the side of the adjacent transmission member close to the adjacent leveling member. The part is filled with gas.

[0005] Preferably, an upward inclined surface is provided on one side of the leveling member close to the axis of the tube body, the inclined surface is pressed into fit with the other tube bodies, and the length of the projection of the inclined surface on the horizontal plane is greater than the maximum distance that the leveling member moves relative to the adjacent transmission member.

[0006] Preferably, the tube body is provided with a fourth slide groove evenly distributed circumferentially, a limiting member is slidably connected in the fourth slide groove, a spring is provided between the tube body and the side of the limiting member away from the axis of the tube body, gas is injected into the first slide groove, the first slide groove is connected with the adjacent fourth slide groove, and the transmission ring is provided with grooves evenly distributed circumferentially, which are limitedly matched with the adjacent limiting member.

[0007] Preferably, the maximum pressure of the gas in the first chute is lower than the maximum pressure of the gas in the adjacent second chute.

[0008] Preferably, an inclined surface is provided on the upper side of the inner side of the tube body, and an inclined surface is provided on the lower side of the outer side of the tube body, so as to align and connect the two tube bodies.

[0009] Preferably, an annular protrusion is provided at the lower part of the outer tube body, the longitudinal section of the annular protrusion is triangular, the lower side of the annular protrusion is made of elastic material, and the elastic material part of the annular protrusion is extruded and sealed with the inclined surface on the upper side of the other tube body.

[0010] Preferably, the inclined surface on the upper side of the tube body is provided with evenly distributed annular grooves, and the annular grooves are used to increase the contact area between the inclined surface on the upper side of the tube body and the lower side of other annular protrusions of the tube body.

[0011] Preferably, it also includes limit blocks evenly distributed circumferentially, the tube body is provided with a fifth slide groove evenly distributed circumferentially, the limit block is slidably connected in the adjacent fifth slide groove, a spring is provided between the side of the limit block away from the axis of the tube body and the tube body, the tube body is provided with a limit groove, and the limit groove cooperates with the limit blocks on the other tube bodies.

[0012] Preferably, the tube body is provided with a sixth slide groove evenly distributed circumferentially, the sixth slide groove is connected with the adjacent fifth slide groove, the sliding member is slidably connected in the sixth slide groove, the sliding member is limitedly cooperated with the adjacent limit block, the sliding members evenly distributed circumferentially are commonly fixedly connected with a mounting ring on one side close to the axis of the tube body, and a spring is provided between the side of the sliding member away from the mounting ring and the tube body.

[0013] Preferably, the mounting ring is fixedly connected with an elastic ring, and a ring-shaped groove is provided on one side of the tube body close to the mounting ring, and the groove is extrusion-fitted with the elastic ring on the mounting ring.

[0014] The beneficial effect produced by adopting the above technical solution is as follows: the present invention makes the threads on the lower side of the tube body to be connected contact with the threads on the upper side of the tube body to be connected when the axis of the tube body to be connected is in line with the axis of the connecting body, thereby avoiding damage to the threads during connection due to the existence of an angle between the tube body to be connected and the connecting body.

[0015] The elastic part of the lower side of the annular protrusion of the tube to be connected is squeezed and filled into the annular groove of the upper inclined surface of the upper tube body of the connecting main body, thereby increasing the contact area between the two and further increasing the sealing effect between the two tube bodies.

[0016] When the torque of the pipe to be connected reaches a specified value, the limit block on the upper side of the connecting body is inserted into the limit groove of the pipe to be connected, thereby preventing the threaded connection between the two pipes from loosening due to vibration or the like, thereby enhancing the connection effect between the two pipes.

[0017] An elastic ring is provided on the mounting ring to seal the pipe body to be connected and the connecting body, and an annular groove is provided on the pipe body near the elastic ring on the mounting ring, so that when the elastic ring on the mounting ring is squeezed, it fills the adjacent annular groove on the pipe body, thereby improving the sealing effect.

[0018] By arranging an inclined surface on the upper side of the inner tube body and an inclined surface on the lower side of the outer tube body, the insertion of the two tube bodies when connected is facilitated, thereby improving the connection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention in a connected state;

[0020] Figure 2 It is a three-dimensional structural cross-sectional view of the tube body of the present invention;

[0021] Figure 3 It is a partial cross-sectional view of the three-dimensional structure of the tube body of the present invention;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the leveling part and the transmission part of the present invention;

[0023] Figure 5 It is a three-dimensional structural cross-sectional view of the limit block, the sliding member and the mounting ring of the present invention;

[0024] Figure 6 It is a three-dimensional structural cross-sectional view of the position of the upper limit groove on the pipe body of the present invention.

[0025] The reference numbers in the figure are: 1. tube body, 101. first slide groove, 102. second slide groove, 103. third slide groove, 104. fourth slide groove, 105. fifth slide groove, 106. limiting groove, 107. sixth slide groove, 2. leveling member, 3. transmission member, 4. transmission ring, 5. limiting pin, 6. limiting member, 7. limiting block, 8. sliding member, 9. mounting ring. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0028] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0029] The following is a description of preferred embodiments of the present invention with reference to the accompanying drawings.

[0030] Example 1: A thermal insulation oil casing with a double sealing structure for offshore oil mining, such as Figure 1-Figure 4As shown, it includes a tube body 1, an inclined surface is provided on the upper side of the tube body 1, and an inclined surface is provided on the lower side of the outside of the tube body 1, which is used to align and connect the two tube bodies 1. When the two tube bodies 1 are connected to each other, the diameter of the lower side of the tube body 1 is smaller than the diameter of the upper side thereof, so it is easier for the two tube bodies 1 to be aligned and inserted into each other when connected. A heat insulating material is provided on the outer side of the tube body 1 to isolate the temperature. The tube body 1 is provided with a plurality of (six as an example here) first slide grooves 101 evenly distributed in the circumferential direction. A leveling member 2 is slidably connected in the first slide groove 101. The leveling member 2 is located above the thread on the upper side of the tube body 1. The leveling member 2 is composed of a needle head and The first slide groove 101 is composed of a disc portion, and its needle head faces the axis of the tube body 1. The leveling member 2 penetrates the side of the adjacent first slide groove 101 close to the axis of the tube body 1. The tube body 1 is provided with a plurality of (six are taken as an example here) second slide grooves 102 evenly distributed in the circumferential direction. The second slide groove 102 is slidably connected with a transmission member 3. The transmission member 3 is composed of a small disc, a round rod and a large disc. The round rod portion of the transmission member 3 penetrates between the adjacent second slide groove 102 and the adjacent first slide groove 101. The small disc portion of the transmission member 3 is slidably connected with the adjacent leveling member 2. The leveling member 2 is provided with a cavity. The transmission member 3 penetrates the disc portion of the leveling member 2. The small disc portion of the transmission member 3 is slidably connected to the cavity of the leveling member 2. An upward inclined surface is provided on the side of the leveling member 2 close to the axis of the tube body 1. The inclined surface is pressed and matched with other tube bodies 1. When other tube bodies 1 move downward to press the inclined surface of the leveling member 2, the leveling member 2 moves in the direction away from the axis of the tube body 1. The length of the projection of the inclined surface on the horizontal plane is greater than the maximum distance that the leveling member 2 moves relative to the adjacent transmission member 3. When the leveling member 2 is pressed and moved to be supported by the transmission member 3, part of the leveling member 2 still does not enter the tube body 1, thereby jamming the tube body 1 that is not aligned during connection. An annular third The slide groove 103, a transmission ring 4 is slidably connected in the third slide groove 103, and a plurality of (six are taken as an example here) circumferentially evenly distributed limit pins 5 are fixedly connected to the lower side of the transmission ring 4. The limit pins 5 penetrate between the third slide groove 103 and the adjacent second slide groove 102, and the limit pins 5 are squeezed and matched with the adjacent transmission member 3. When the transmission member 3 moves in the direction away from the axis of the tube body 1, the adjacent limit pins 5 are squeezed and drive the transmission ring 4 to move upward. The second slide groove 102 is located on the side of the adjacent transmission member 3 close to the adjacent leveling member 2 and is filled with gas. The gas is used to provide power for the movement of the adjacent transmission member 3.

[0031] like Figure 4As shown, the tube body 1 is provided with a plurality of (six are taken as an example here) fourth slide grooves 104 uniformly distributed in the circumferential direction, and the fourth slide groove 104 is slidably connected with the limit member 6, the limit member 6 is composed of a round rod and a rectangular block, and a spring is arranged between the side of the limit member 6 away from the axis of the tube body 1 and the tube body 1, and the spring is used to reset the adjacent limit member 6, and the first slide groove 101 is filled with gas, and the gas is used to drive the adjacent limit member 6 to move, and the maximum pressure of the gas in the first slide groove 101 is less than the maximum pressure of the gas in the adjacent second slide groove 102. When the first slide groove 101 After the internal gas is squeezed and drives the adjacent limit member 6 to move, the transmission member 3 drives the adjacent leveling member 2 to continue to move and compress the gas in the adjacent first slide groove 101 under the pressure of the gas in the adjacent second slide groove 102. The first slide groove 101 is connected with the adjacent fourth slide groove 104. The transmission ring 4 is provided with grooves evenly distributed in the circumference, and the grooves are limited and matched with the adjacent limit members 6. The limit member 6 moves to the side away from the axis of the tube body 1 to release the limit on the transmission ring 4. When all six limit members 6 release the limit on the transmission ring 4, the transmission ring 4 can move.

[0032] like Figure 2 and Figure 3 As shown, an annular protrusion is provided at the lower part of the outside of the tube body 1, and the longitudinal section of the annular protrusion is triangular, which is used to adapt to the inclined surface on the upper side of the other tube body 1. The lower side of the annular protrusion is made of elastic material, and the elastic material part of the annular protrusion is squeezed and sealed with the inclined surface on the upper side of the other tube body 1. The inclined surface on the upper side of the tube body 1 is provided with evenly distributed annular grooves, which are used to increase the contact area between the inclined surface on the upper side of the tube body 1 and the lower side of the annular protrusion of the other tube body 1. When the lower side of the annular protrusion of the tube body 1 contacts the annular groove of the inclined surface on the upper side of the other tube body 1, the elastic part of the annular protrusion of the tube body 1 is squeezed into the annular groove of the inclined surface on the upper side of the other tube body 1, thereby enhancing the sealing effect between the two tube bodies 1.

[0033] When using the device, several devices are connected one by one, and the connecting body is fixed during connection, and then the lower side of the tube body 1 to be connected is aligned with the upper side of the connecting body, and then the tube body 1 to be connected is moved downward, and the tube body 1 to be connected is gradually moved downward until it contacts the inclined surfaces of the six leveling members 2 on the uppermost tube body 1 in the connecting body, and the leveling members 2 are squeezed and move in a direction away from the axis of the tube body 1, and the gas in the adjacent first slide groove 101 is compressed and enters the adjacent fourth slide groove 104 during the movement of the leveling member 2, and the air pressure in the first slide groove 101 rises, pushing the adjacent limiting member 6 to move in a direction away from the axis of the tube body 1 and compressing the adjacent spring, and when the six limiting members 6 are separated from the transmission ring 4, the leveling member 2 moves to the maximum distance relative to the adjacent transmission member 3. When the transmission member 3 moves away from the axis of the tube body 1, the transmission ring 4 loses the limit of the six limit members 6 and can move. The transmission member 3 moves in the direction away from the axis of the tube body 1 under the push of the gas in the adjacent second slide groove 102. When the transmission member 3 moves, it squeezes the adjacent limit pin 5, so that the limit pin 5 pushes the transmission ring 4 to move upward. When the large disc part of the transmission member 3 passes the adjacent limit pin 5, the small disc part of the transmission member 3 moves to the side of the adjacent leveling member 2 close to its disc part and drives it to move. When the transmission member 3 moves to contact the side of the adjacent second slide groove 102 away from the axis of the tube body 1, the adjacent leveling member 2 retracts into the tube body 1. At this time, the six leveling members 2 retract into the tube body 1 at the same time, and the tube body 1 to be connected is moved downward until the threaded part on its lower side contacts the threaded part on the upper side of the tube body 1 on the upper side of the connecting main body, and then the tube body 1 to be connected is rotated to be threadedly connected with the connecting main body.

[0034] When there is a certain angle during the connection process between the tube body 1 to be connected and the connecting body, part of the leveling parts 2 in the tube body 1 on the upper side of the connecting body transmits the adjacent limit parts 6 to release the limit on the transmission ring 4, and the remaining part of the leveling parts 2 moves to squeeze the gas in the adjacent first slide groove 101 and cannot transmit the adjacent limit parts 6 to release the limit on the transmission ring 4. The six transmission parts 3 still cannot drive the transmission ring 4 to move upward through the adjacent limit pins 5, so the transmission parts 3 will not drive the adjacent leveling parts 2 to be completely retracted into the tube body 1, and the threads on the lower side of the tube body 1 to be connected cannot contact the threads on the upper side of the tube body 1 on the upper side of the connecting body, so that the tube body 1 to be connected keeps the axis colinear when connected with the connecting body, avoiding damage to the threads during connection caused by the angle between the tube body 1 to be connected and the connecting body.

[0035] As the tube body 1 to be connected moves downward, the lower side of the annular protrusion of the tube body 1 to be connected contacts and gradually squeezes the inclined surface on the upper inner side of the tube body 1 on the upper side of the connecting body, and the lower side of the annular protrusion of the tube body 1 to be connected is deformed and fills the annular groove on the inclined surface on the upper inner side of the tube body 1 on the upper side of the connecting body, thereby increasing the sealing effect between the two tube bodies 1. When the tube body 1 to be connected is rotated to the specified torque, the connection is completed.

[0036] Embodiment 2: Based on embodiment 1, Figure 3 , Figure 5 and Figure 6 As shown, it also includes a plurality of (six as an example here) circumferentially evenly distributed limit blocks 7, the tube body 1 is provided with a plurality of (six as an example here) circumferentially evenly distributed fifth slide grooves 105, the limit blocks 7 are slidably connected in adjacent fifth slide grooves 105, a spring is provided between the side of the limit block 7 away from the axis of the tube body 1 and the tube body 1, the spring is used to provide power for the movement of the adjacent limit block 7, an annular limit groove 106 is provided on the lower part outside the tube body 1, the limit groove 106 is limitedly matched with the limit blocks 7 on other tube bodies 1, when the limit block 7 is inserted into the limit groove 106 on the other tube body 1, the connection between the two tube bodies 1 is made tighter.

[0037] like Figure 5 As shown, the tube body 1 is provided with a plurality of (six are taken as an example here) sixth slide grooves 107 evenly distributed in the circumferential direction, the sixth slide groove 107 is communicated with the adjacent fifth slide groove 105, a sliding member 8 is slidably connected in the sixth slide groove 107, the sliding member 8 is composed of a long round rod, a short round rod and a folding rod, the sliding member 8 is limitedly matched with the adjacent limit block 7, the limit block 7 is provided with a circular hole, the long rod portion of the sliding member 8 is inserted into the circular hole of the adjacent limit block 7, so that the limit block 7 cannot move, and the upper sides of the short rod portions of the six sliding members 8 are commonly fixed with The mounting ring 9 is provided with a spring between the side of the sliding member 8 away from the mounting ring 9 and the tube body 1, and the spring is used to keep the adjacent sliding member 8 limited to the adjacent limit block 7. An elastic ring is fixedly connected to the upper side of the mounting ring 9, and the elastic ring is used to be squeezed and matched with other tube bodies 1 to form a seal. The tube body 1 is provided with an annular groove on the side close to the mounting ring 9, and the groove is squeezed and matched with the elastic ring on the mounting ring 9. When the elastic ring on the mounting ring 9 is squeezed, it enters the adjacent annular groove on the tube body 1, thereby increasing the sealing effect between the two tube bodies 1.

[0038] When the tube body 1 to be connected moves downward, the lower side of the tube body 1 to be connected contacts the elastic ring of the mounting ring 9 on the upper tube body 1 of the connecting main body, and then drives the mounting ring 9 to move downward. The mounting ring 9 drives the six sliding members 8 to move downward and compresses the adjacent springs. The sliding member 8 moves downward until it is separated from the adjacent limit block 7. After the limit block 7 loses the limit of the adjacent sliding member 8, it moves toward the direction close to the axis of the tube body 1 under the action of the adjacent spring until the limit block 7 contacts the outer side of the tube body 1 to be connected. At this time, the tube body 1 to be connected continues to move downward and squeezes the elastic ring of the mounting ring 9 on the upper tube body 1 of the connecting main body. When the mounting ring 9 contacts the tube body 1, the tube body 1 to be connected continues to move downward to increase the torque. At this time, the elastic ring on the mounting ring 9 is squeezed and deformed and fills the groove on the side of the tube body 1 close to the mounting ring 9, thereby increasing the sealing effect.

[0039] When the torque of the tube body 1 to be connected reaches a specified value, the limit block 7 on the upper tube body 1 of the connecting main body is inserted into the limit groove 106 of the tube body 1 to be connected under the action of the adjacent spring, thereby preventing the threaded connection between the two tube bodies 1 from loosening due to vibration and other reasons, thereby enhancing the connection effect between the two tube bodies 1.

[0040] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A thermal insulation oil casing with a double sealing structure for offshore oil mining, characterized by: The invention comprises a tube body (1), the outer side of the tube body (1) is provided with a heat-insulating material, the tube body (1) is provided with a first chute (101) uniformly distributed in the circumferential direction, a leveling member (2) is slidably connected in the first chute (101), the leveling member (2) passes through the side of the adjacent first chute (101) close to the axis of the tube body (1), the tube body (1) is provided with a second chute (102) uniformly distributed in the circumferential direction, a transmission member (3) is slidably connected in the second chute (102), the transmission member (3) passes through the adjacent second chute (102) and the adjacent first chute (101), the transmission member (3) passes through the adjacent second chute (102) and the adjacent first chute (101), and the transmission member (3) passes through the adjacent second chute (102) and the adjacent first chute (101). ) is slidably connected to the adjacent leveling member (2), a third slide groove (103) is provided in the tube body (1), a transmission ring (4) is slidably connected in the third slide groove (103), a circumferentially uniformly distributed limit pin (5) is fixed to the transmission ring (4) on the side close to the circumferentially uniformly distributed transmission member (3), the limit pin (5) passes through between the third slide groove (103) and the adjacent second slide groove (102), the limit pin (5) is squeezed and fitted with the adjacent transmission member (3), and the part of the second slide groove (102) located on the side of the adjacent transmission member (3) close to the adjacent leveling member (2) is filled with gas; The leveling member (2) is provided with an upward inclined surface on one side close to the axis of the tube body (1), and the inclined surface is pressed into engagement with the other tube body (1), and the length of the projection of the inclined surface on the horizontal plane is greater than the maximum distance that the leveling member (2) moves relative to the adjacent transmission member (3); The tube body (1) is provided with a fourth slide groove (104) uniformly distributed in the circumference, and a limiting member (6) is slidably connected in the fourth slide groove (104). A first spring is provided between the tube body (1) and the limiting member (6) on a side away from the axis of the tube body (1). Gas is injected into the first slide groove (101), and the first slide groove (101) is connected to the adjacent fourth slide groove (104). The transmission ring (4) is provided with a groove uniformly distributed in the circumference, and the groove is limitedly matched with the adjacent limiting member (6).

2. The thermal insulation oil casing with double sealing structure for offshore oil mining according to claim 1 is characterized in that: The maximum pressure of the gas in the first chute (101) is lower than the maximum pressure of the gas in the adjacent second chute (102).

3. The thermal insulation oil casing with a double sealing structure for offshore oil mining according to claim 1 is characterized in that: An inclined surface is provided on the upper side of the inner tube body (1), and an inclined surface is provided on the lower side of the outer tube body (1), for aligning and connecting the two tube bodies (1).

4. The thermal insulation oil casing with a double sealing structure for offshore oil mining according to claim 3 is characterized in that: An annular protrusion is provided on the lower portion of the outer portion of the tube body (1), the longitudinal section of the annular protrusion being triangular, the lower side of the annular protrusion being made of elastic material, and the elastic material portion of the annular protrusion being extruded and sealed with the inclined surface on the upper side of the inner portion of the tube body (1).

5. The thermal insulation oil casing with double sealing structure for offshore oil mining according to claim 4 is characterized in that: The inclined surface on the inner upper side of the tube body (1) is provided with uniformly distributed first annular grooves, and the annular grooves are used to increase the contact area between the inclined surface on the inner upper side of the tube body (1) and the lower side of the annular protrusions of the other tube bodies (1).

6. The thermal insulation oil casing with a double sealing structure for offshore oil mining according to claim 5 is characterized in that: The invention also includes a circumferentially uniformly distributed limit block (7), the tube body (1) is provided with a circumferentially uniformly distributed fifth slide groove (105), the limit block (7) is slidably connected in the adjacent fifth slide groove (105), a second spring is provided between the side of the limit block (7) away from the axis of the tube body (1) and the tube body (1), the tube body (1) is provided with a limit groove (106), and the limit groove (106) is limitedly matched with the limit block (7) on the other tube body (1).

7. The thermal insulation oil casing with a double sealing structure for offshore oil mining according to claim 6 is characterized in that: The tube body (1) is provided with a sixth slide groove (107) uniformly distributed in the circumference, the sixth slide groove (107) is communicated with the adjacent fifth slide groove (105), a sliding member (8) is slidably connected in the sixth slide groove (107), the sliding member (8) is limitedly matched with the adjacent limit block (7), the sliding member (8) uniformly distributed in the circumference is fixedly connected with a mounting ring (9) on one side close to the axis of the tube body (1), and a third spring is provided between the side of the sliding member (8) away from the mounting ring (9) and the tube body (1).

8. The thermal insulation oil casing with a double sealing structure for offshore oil mining according to claim 7 is characterized in that: The mounting ring (9) is fixedly connected to an elastic ring, and a second annular groove is provided on a side of the tube body (1) close to the mounting ring (9), and the second annular groove is extrusion-fitted with the elastic ring on the mounting ring (9).

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