Drill pipe connection device for floating shoe cementing and floating shoe cementing pipe string

Abstract

The present invention provides a drill pipe connection device for floating shoe cementing and a floating shoe cementing pipe column, the drill pipe connection device for floating shoe cementing comprises: an upper connector, a lower connector and a spiral structure; the upper connector is used to connect with the drill pipe, the lower connector is used to connect with the insertion head; the lower connector is connected with the upper connector, and the lower connector can move up and down relative to the upper connector; the spiral structure is arranged between the upper connector and the lower connector, and the spiral structure is configured to make the lower connector rotate relative to the upper connector when the lower connector moves up and down relative to the upper connector. Through the present invention, the technical problem that the insertion head cannot be smoothly inserted into the floating shoe valve core during cementing operations is alleviated.

Description

Technical Field

[0001] The invention relates to the technical field of offshore drilling equipment, and in particular to a drill pipe connecting device for floating shoe cementing and a floating shoe cementing pipe column. Background Art

[0002] Cementing is the most important part of the drilling process, which lays the foundation for subsequent drilling operations. Cementing must be carried out as soon as possible after the surface water-insulating pipe is lowered to the specified depth. If a fault occurs during the cementing operation, it may cause a series of operational accidents such as well wall collapse.

[0003] When drilling into large-diameter surface riser pipes, floating shoes must be used. When cementing with floating shoes, the insertion head that matches the float shoe valve core needs to be inserted into the float shoe valve core. The matching parts of the two need to be sealed with rubber rings before cement slurry can be poured. The insertion head is installed at the bottom of the drill pipe and lowered together with the drill pipe. When it is lowered to the bottom of the designated riser, the insertion head is inserted into the float shoe valve core.

[0004] In the above operations, sometimes the drill pipe stabilizer is damaged, resulting in the drill pipe not being centered inside the watertight pipe, and the insertion head is difficult to smoothly insert into the float shoe valve core. Sometimes the float shoe is not well placed, the float shoe valve core is in a skewed state inside the float shoe, the float shoe valve core and the drill pipe are not concentric, which also causes the insertion head to be unable to smoothly insert into the float shoe valve core. If the above two situations occur, the insertion head will directly hit the cement on the upper part of the float shoe or the upper end of the valve core, and the insertion head will not be smoothly inserted into the float shoe for cementing. Summary of the invention

[0005] The purpose of the present invention is to provide a drill pipe connection device for float shoe cementing and a float shoe cementing pipe string, so as to alleviate the technical problem that an insertion head cannot be smoothly inserted into a float shoe valve core during cementing operation.

[0006] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0007] The present invention provides a drill pipe connecting device for floating shoe cementing, comprising: an upper connector, a lower connector and a spiral structure; the upper connector is used to connect with the drill pipe, and the lower connector is used to connect with an insertion head; the lower connector is connected to the upper connector, and the lower connector can move up and down relative to the upper connector; the spiral structure is arranged between the upper connector and the lower connector, and the spiral structure is configured to rotate the lower connector relative to the upper connector when the lower connector moves up and down relative to the upper connector.

[0008] In a preferred embodiment, the upper connector is provided with a sliding hole, and the lower connector is slidably inserted into the sliding hole.

[0009] In a preferred embodiment, the spiral structure includes a spiral groove and a sliding block slidably embedded in the spiral groove, the spiral groove is arranged on the outer side wall of the lower connector, and the sliding block is arranged on the inner wall of the sliding hole.

[0010] In a preferred embodiment, the sliding block and the upper connector are separate structures, the side wall of the sliding hole is provided with a block through hole, and the sliding block is inserted into the block through hole.

[0011] In a preferred embodiment, a nut pressing ring is externally connected to the upper connector, the nut pressing ring surrounds the sliding block, and the outer end of each sliding block abuts against the inner wall of the nut pressing ring.

[0012] In a preferred embodiment, the outer side wall of the lower connector is provided with a plurality of spiral grooves spaced apart from each other circumferentially.

[0013] In a preferred embodiment, the sliding hole includes an upper hole portion and a lower hole portion, the inner diameter of the upper hole portion is smaller than the inner diameter of the lower hole portion; the lower connector includes an upper column portion cooperating with the upper hole portion and a lower column portion cooperating with the lower hole portion, and the side walls of the upper column portion and the lower column portion are respectively provided with sealing rubber rings.

[0014] In a preferred embodiment, the drill pipe connection device for float shoe cementing includes an elastic mechanism disposed between the upper connector and the lower connector, and the elastic mechanism is configured to generate resistance to the lower connector approaching the upper connector.

[0015] In a preferred embodiment, the elastic mechanism comprises a spring.

[0016] The present invention provides a floating shoe cementing pipe string, comprising an insertion head, a drill rod, and the above-mentioned drill rod connecting device for floating shoe cementing; the insertion head is connected to the lower connector, and the drill rod is connected to the upper connector.

[0017] The characteristics and advantages of the present invention are:

[0018] When the float shoe valve core is not centered or the drill pipe straightener is damaged, causing the insertion head to be not centered, the drill pipe connection device for float shoe cementing can prompt the insertion head to adjust its position to align with the float shoe valve core, which is conducive to the smooth insertion of the insertion head into the float shoe and ensures the progress of cementing operations. The beneficial effects of the drill pipe connection device include: (1) reducing the difficulty of aligning the insertion head with the float shoe valve core. The drill pipe connection device helps the insertion head to insert the float shoe valve core, reduces the situation where the insertion head cannot be inserted into the float shoe valve core, and ensures cementing operations; (2) effectively improves the efficiency of cementing operations and reduces cementing difficulties; (3) improves the efficiency of the insertion head and the float shoe; (4) reduces the damage to the guide surface of the insertion head or the float shoe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1-Figure 3 A working process diagram of the drill pipe connection device for floating shoe cementing provided by the present invention;

[0021] Figure 4 A schematic diagram of the structure of a drill pipe connection device for a float shoe cementing provided by the present invention;

[0022] Figure 5 for Figure 4 A schematic diagram of the structure of the upper connector in the drill pipe connection device for floating shoe cementing shown;

[0023] Figure 6 for Figure 4 The structural schematic diagram of the nut pressing ring in the drill pipe connecting device for floating shoe cementing shown in FIG.

[0024] Figure 7-Figure 8 for Figure 4 A schematic diagram of the structure of the lower connector in the drill pipe connection device for floating shoe cementing shown;

[0025] Figure 9-10 for Figure 4 The structural schematic diagram of the sliding block in the drill pipe connection device for floating shoe cementing shown;

[0026] Fig.11 for Figure 4 The structural schematic diagram of the anti-rotation pin in the drill pipe connecting device for floating shoe cementing is shown.

[0027] Description of Figure Numbers:

[0028] 10. Float shoe; 9. Insertion head; 91. Drill rod;

[0029] 1. Upper connector; 11. Drill pipe female buckle; 14. Threaded hole; 15. External threaded part; 16. Block through hole;

[0030] 120, sliding hole; 12, upper hole portion; 13, lower hole portion;

[0031] 2. Upper sealing rubber ring; 8. Lower sealing rubber ring;

[0032] 30. Elastic mechanism; 3. Spring;

[0033] 5. Nut pressing ring; 51. Pin through hole; 52. Internal threaded portion; 4. Anti-rotation pin;

[0034] 60, spiral structure; 6, sliding block; 75, spiral groove;

[0035] 7. lower connector; 72. upper column; 74. lower column;

[0036] 71. Upper sealing ring groove; 73. Lower sealing ring groove; 76. Drill pipe male buckle. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1

[0039] The present invention provides a drill pipe connection device for floating shoe cementing, such as Figure 4 As shown, the drill rod connection device includes: an upper connector 1, a lower connector 7 and a spiral structure 60; the upper connector 1 is used to connect to the drill rod 91, and the lower connector 7 is used to connect to the insertion head 9; the lower connector 7 is connected to the upper connector 1, and the lower connector 7 can move up and down relative to the upper connector 1; the spiral structure 60 is arranged between the upper connector 1 and the lower connector 7, and the spiral structure 60 is configured to rotate the lower connector 7 relative to the upper connector 1 when the lower connector 7 moves up and down relative to the upper connector 1.

[0040] During the drilling operation, after the riser pipe string is connected and lowered into place, the drill pipe connecting device is connected to the drill pipe 91, and the insertion head 9 is installed to the lower end of the drill pipe connecting device. Figure 1 and Figure 2 As shown, after the insertion head 9 is lowered to contact the cement guide surface, the lower connector 7 and the lower end of the insertion head 9 are subjected to resistance, and the lower connector 7 and the insertion head 9 move upward relative to the upper connector 1; because the drill pipe 91 and the upper connector 1 do not rotate themselves, the lower connector 7 and the insertion head 9 rotate. The upper surface of the inner part of the float shoe 10 is usually provided with a conical guide surface of cement, and the rotation of the lower connector 7 and the insertion head 9 will cause it to move to a lower center position on the guide surface. With the rotation and sliding, the insertion head 9 reaches the center position of the float shoe 10 on the cement guide surface and is inserted into the valve core of the float shoe 10.

[0041] When the valve core of the float shoe 10 is not centered or the drill rod 91 stabilizer is damaged, causing the insertion head 9 to be not centered, the drill rod connection device for float shoe cementing can prompt the insertion head 9 to adjust its position to align with the valve core of the float shoe 10, which is conducive to the smooth insertion of the insertion head 9 into the float shoe 10 and ensures the progress of cementing operations. The beneficial effects of the drill rod connection device include: (1) reducing the difficulty of aligning the insertion head 9 with the valve core of the float shoe 10. The drill rod connection device helps the insertion head 9 to insert the valve core of the float shoe 10, reduces the situation where the insertion head 9 cannot insert the valve core of the float shoe 10, and ensures cementing operations; (2) effectively improves the efficiency of cementing operations and reduces cementing difficulties; (3) improves the efficiency of the insertion head 9 and the float shoe 10; (4) reduces the damage to the guide surface of the insertion head 9 or the float shoe 10.

[0042] The drill pipe connection device for float shoe cementing is not limited to being used in float shoes 10 with conical guide surfaces. When the guide surface of the float shoe 10 is a plane, the lower connector 7 and the insertion head 9 rotate, reducing the resistance of the insertion head 9 moving on the guide surface, making it easier for the insertion head 9 to adjust its position so as to move to align with the valve core of the float shoe 10.

[0043] In the case where the drill rod 91 is rigidly connected to the insertion head 9, the drill platform needs to be rotated to drive the drill rod 91 and the insertion head 9 to rotate, and since the insertion head 9 has bottomed out, it is difficult to adjust the position of the insertion head 9. Compared with the case where the drill rod 91 is rigidly connected to the insertion head 9, when the drill rod connection device is used, it is less difficult to adjust the position of the insertion head 9 to insert the valve core of the float shoe 10.

[0044] In one embodiment, the upper end of the upper connector 1 is a drill pipe female buckle 11, so as to facilitate connection with the drill pipe 91; the upper connector 1 has a cement slurry path inside. The lower end of the lower connector 7 is a drill pipe male buckle 76, so as to facilitate connection with the insertion head 9, and the lower connector 7 has a cement slurry path inside. When using the drill pipe connection device, the drill pipe 91 is lowered to the depth where the insertion head 9 is close to the position of the float shoe 10, and then slowly lowered until the weight of the drill pipe 91 completely acts on the float shoe 10.

[0045] The connection mode between the upper connector 1 and the lower connector 7 is not limited to one, for example: the upper connector 1 is sleeved outside the lower connector 7, or the lower connector 7 is sleeved outside the upper connector 1. In one embodiment, the upper connector 1 is provided with a sliding hole 120, and the lower connector 7 can be slidably inserted into the sliding hole 120, and the sliding hole 120 plays a guiding role in the up and down movement of the lower connector 7.

[0046] Furthermore, if Figure 5 , Figure 7 and Figure 8As shown, the sliding hole 120 includes an upper hole portion 12 and a lower hole portion 13, the inner diameter of the upper hole portion 12 is smaller than the inner diameter of the lower hole portion 13; the lower connector 7 includes an upper column portion 72 matched with the upper hole portion 12 and a lower column portion 74 matched with the lower hole portion 13, and the side walls of the upper column portion 72 and the lower column portion 74 are respectively provided with sealing rubber rings. Figure 4 As shown, the sealing rubber ring provided on the upper column 72 is the upper sealing rubber ring 2, which is used to seal the lower connector 7 and the upper end of the upper connector 1 to prevent cement slurry from leaking out during cementing; the sealing rubber ring provided on the lower column 74 is the lower sealing rubber ring 8, which is used to seal the lower connector 7 and the lower end of the upper connector 1 to prevent seawater from entering the sliding hole 120 and corroding the internal components such as the spring 3. The upper sealing rubber ring 2 and the lower sealing rubber ring 8 enhance the sealing function, effectively preventing cement slurry from overflowing through the drill pipe 91, and also effectively preventing seawater from entering the drill pipe 91.

[0047] In one embodiment, the spiral structure 60 includes a spiral groove 75 and a sliding block 6 slidably embedded in the spiral groove 75. The spiral groove 75 and the sliding block 6 are respectively arranged on the upper connector 1 and the lower connector 7. When the sliding block 6 is subjected to forces in the up-down direction, it makes a spiral motion along the spiral groove 75 under the guidance of the spiral groove 75, thereby driving the lower connector 7 to rotate relative to the upper connector 1. Preferably, the spiral groove 75 is arranged on the outer wall of the lower connector 7, and the sliding block 6 is arranged on the inner wall of the sliding hole 120. The sliding block 6 is fixed. When the sliding block 6 moves relatively in the spiral groove 75 of the lower connector 7, the lower connector 7 is driven by the sliding block 6 to rotate. Fig. 9 and Fig.10 As shown, a protrusion is provided on one side of the sliding block 6 , and the protrusion matches with the spiral groove 75 and can slide along the spiral groove 75 .

[0048] Furthermore, the sliding block 6 and the upper connector 1 are separate structures, and the side wall of the sliding hole 120 is provided with a block through hole 16, and the sliding block 6 is inserted into the block through hole 16 to facilitate the installation of the lower connector 7 into the sliding hole 120. The sliding block 6 is fixedly connected to the upper connector 1. Figure 4-Figure 6 As shown, the upper connector 1 is externally connected with a nut pressing ring 5, which surrounds the sliding block 6, and the outer end of each sliding block 6 abuts against the inner wall of the nut pressing ring 5. The nut pressing ring 5 can prevent the sliding block 6 from escaping from the block through hole 16, thereby improving the stability of the connection between the upper connector 1 and the lower connector 7. After the nut pressing ring 5 is removed, the sliding block 6 can be taken out from the block through hole 16, which is convenient for assembly and disassembly, and is convenient for maintenance.

[0049] The nut pressing ring 5 can be threadedly connected to the upper connector 1, such as Figure 4 , Figure 6 and Fig.11As shown, the interior of the nut pressing ring 5 has an internal threaded portion 52 connected to the upper connector 1, and the outer wall of the upper connector 1 is provided with an external threaded portion 15 matching the internal threaded portion 52; the upper portion of the nut pressing ring 5 has a pin through hole 51, and the anti-rotation pin 4 penetrated through the pin through hole 51 is fixed on the upper connector 1, and the anti-rotation pin 4 prevents the nut pressing ring 5 from rotating, and the anti-rotation pin 4 can adopt a hexagon socket bolt with an external thread.

[0050] like Figure 7 As shown, the outer side wall of the lower connector 7 is provided with a plurality of spiral grooves 75 spaced apart from each other circumferentially, and a plurality of sliding blocks 6 are respectively installed in the spiral grooves 75 to drive the lower connector 7 to rotate smoothly. Preferably, the rise angle of the spiral groove is 60°.

[0051] In one embodiment, the drill rod connection device includes an elastic mechanism 30 disposed between the upper connector 1 and the lower connector 7, and the elastic mechanism 30 is configured to generate resistance to the lower connector 7 approaching the upper connector 1. The elastic mechanism 30 reserves space for the upper connector 1 and the lower connector 7 to move up and down relative to each other. After the insertion head 9 touches the bottom, the elastic mechanism 30 is compressed, and the upper connector 1 can move downward, and the upper connector 1 and the lower connector 7 produce relative up and down movement, so that the sliding block 6 moves in the spiral groove 75, driving the lower connector 7 to rotate. After the insertion head 9 is inserted into the floating shoe 10, it continues to press down until the elastic mechanism 30 is completely compressed, and the lower connector 7 and the upper connector 1 can no longer be displaced and stop. At this time, the grouting operation can be started after the up and down movement of the drill rod 91 is restricted.

[0052] Through the elastic mechanism 30, the insertion head 9 will not suddenly produce a large impact when contacting the guide surface of the float shoe 10, which is conducive to protecting the end of the insertion head 9 and the guide surface; the elastic mechanism 30 has a buffering effect, which can prevent the insertion head 9 from having a large impact on the cement surface inside the float shoe 10 due to the rigid connection, thereby reducing the situation of holes on the cement surface due to impact, reducing the situation of damage to the insertion head 9 due to impact, and making the insertion head 9 reusable. Through the elastic mechanism 30, the drill pipe connection device has an automatic reset function, which can automatically reset after cementing is completed, and there is no need to perform manual reset operation for the next use, which can improve the working efficiency.

[0053] Furthermore, the elastic mechanism 30 includes a spring 3, which is located between the upper connector 1 and the lower connector 7 and plays a role of buffering and also plays a role of resetting. Figure 4 As shown, the spring 3 is sleeved outside the upper column portion 72 .

[0054] The installation steps of the drill pipe connection device include: (1) installing the upper sealing rubber ring 2 into the upper sealing ring groove 71 of the upper connector 1, and installing the lower sealing rubber ring 8 into the lower sealing ring groove 73 of the upper connector 1; (2) installing the spring 3 into the upper connector 1; (3) assembling the lower connector 7 with the upper connector 1; (4) installing the sliding block 6 into the block through hole 16 of the upper connector 1, and installing the protruding portion of the sliding block 6 into the spiral groove 75 of the lower connector 7; (5) installing the nut pressing ring 5 onto the outside of the upper connector 1 through threaded matching until the nut pressing ring 5 can completely cover the sliding block 6; (6) installing the anti-rotation pin 4, and the anti-rotation pin 4 is screwed to the threaded hole 14 of the upper connector 1 through the pin through hole 51 of the nut pressing ring 5, and is tightened.

[0055] The on-site application method of the drill rod connection device includes the following steps: (1) lowering the drill rod connection device to the position of the float shoe 10 and contacting the cement guide surface, the lower ends of the lower connector 7 and the insertion head 9 are subjected to resistance, the spring 3 is compressed, and when the sliding block 6 and the lower connector 7 produce relative movement through the spiral groove 75, the lower connector 7 will rotate; (2) the rotation of the lower connector 7 and the insertion head 9 will cause them to move to a lower center position on the cement guide surface, and when they rotate to the center position, the insertion head 9 is inserted into the float shoe 10; (3) after the insertion head 9 is inserted into the float shoe 10, it continues to be pressed down until the spring 3 is completely compressed, the lower connector 7 and the upper connector 1 stop moving, and at this time, the grouting operation can be started after the up and down movement of the drill rod 91 is restricted.

[0056] Embodiment 2

[0057] The present invention provides a floating shoe cementing string, such as Figure 1-Figure 3 As shown, it includes an insertion head 9, a drill rod 91, and the above-mentioned drill rod connection device for float shoe cementing, the insertion head 9 is connected to the lower connector 7, and the drill rod 91 is connected to the upper connector 1. When the float shoe cementing string is used for cementing, when the valve core of the float shoe 10 is not centered or the drill rod 91 stabilizer is damaged, resulting in the insertion head 9 not being centered, the insertion head 9 can reach the center position of the float shoe 10 on the cement guide surface by rotating and sliding, and is inserted into the valve core of the float shoe 10 to ensure the progress of cementing operations. The beneficial effects of the float shoe cementing string include: (1) reducing the difficulty of aligning the insertion head 9 with the valve core of the float shoe 10, facilitating the insertion head 9 to insert the valve core of the float shoe 10, reducing the situation where the insertion head 9 cannot insert the valve core of the float shoe 10, and ensuring cementing operations; (2) effectively improving the efficiency of cementing operations and reducing cementing difficulties; (3) improving the efficiency of the insertion head 9 and the float shoe 10; (4) reducing the damage to the guide surface of the insertion head 9 or the float shoe 10.

[0058] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A drill pipe connection device for floating shoe cementing, characterized in that: include: An upper connector, a lower connector and a spiral structure; the upper connector is used to connect with the drill rod, and the lower connector is used to connect with the insertion head; the lower connector is connected to the upper connector, and the lower connector can move up and down relative to the upper connector; The spiral structure is disposed between the upper connector and the lower connector, and the spiral structure is configured to rotate the lower connector relative to the upper connector when the lower connector moves up and down relative to the upper connector; The upper connector is provided with a sliding hole, and the lower connector can be slidably inserted into the sliding hole; The spiral structure includes a spiral groove and a sliding block slidably embedded in the spiral groove, the spiral groove is arranged on the outer side wall of the lower connector, and the sliding block is arranged on the inner wall of the sliding hole; The sliding block and the upper connector are separate structures, the side wall of the sliding hole is provided with a block through hole, and the sliding block is inserted into the block through hole; The upper connector is externally connected with a nut pressing ring, the nut pressing ring surrounds the sliding block, and the outer end of each sliding block abuts against the inner wall of the nut pressing ring; The outer side wall of the lower connector is provided with a plurality of spiral grooves distributed at circumferential intervals.

2. The drill pipe connection device for floating shoe cementing according to claim 1, characterized in that: The sliding hole includes an upper hole portion and a lower hole portion, the inner diameter of the upper hole portion is smaller than the inner diameter of the lower hole portion; the lower connector includes an upper column portion cooperating with the upper hole portion and a lower column portion cooperating with the lower hole portion, and the side walls of the upper column portion and the lower column portion are respectively provided with sealing rubber rings.

3. The drill pipe connection device for floating shoe cementing according to claim 1, characterized in that: The drill pipe connection device for floating shoe cementing includes an elastic mechanism disposed between the upper connector and the lower connector, and the elastic mechanism is configured to generate resistance to the lower connector approaching the upper connector.

4. The drill pipe connection device for floating shoe cementing according to claim 3 is characterized in that: The elastic mechanism comprises a spring.

5. A floating shoe cementing string, characterized in that: It comprises an insertion head, a drill pipe, and a drill pipe connection device for floating shoe cementing according to any one of claims 1 to 4; The insertion head is connected to the lower connector, and the drill rod is connected to the upper connector.

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