Valve core centralizer for making float shoes

Abstract

The present invention provides a valve core straightener for making a float shoe, the valve core straightener comprises: a center rod, an insertion tube, a clamping plate, a clamping mechanism and at least three support rods, the insertion tube is fixed to the lower end of the center rod; each support rod is distributed around the center rod, the lower end of each support rod is hinged to the center rod, and each support rod can swing up and down relative to the center rod; the clamping plate is installed on the center rod, and the clamping mechanism can drive the clamping plate to move downward along the center rod; each support rod can abut against the clamping plate, and when each support rod abuts against the clamping plate, the angles between each support rod and the center rod are equal. Through the present invention, the technical problem that the insertion head is difficult to smoothly insert into the interior of the float shoe valve core and subsequent cementing operations cannot be carried out is alleviated.

Description

Technical Field

[0001] The invention relates to the technical field of offshore drilling equipment, and in particular to a valve core centralizer for making a floating shoe. Background Art

[0002] The float shoe is a casing guide shoe or coupling that can generate buoyancy. The inside of the float shoe is a one-way valve, which can only allow internal liquid to flow out, but not external liquid to flow in. During operation, drilling is carried out at the location where the operation is required, and a watertight pipe or casing with a float shoe is lowered; a drill pipe is lowered into the casing, and an insertion head matching the float shoe valve core is provided at the lower end of the drill pipe. After the insertion head is inserted into the valve core, cementing slurry can be injected through the internal channel of the drill pipe. The cement slurry flows through the valve core and is reflected upward from the bottom of the pipe body to the mud surface, achieving the purpose of cementing.

[0003] The insertion head needs to be inserted into the float shoe valve core to perform cementing. The insertion head is located at the end of the drill pipe, and a centralizer is installed on the drill pipe. The insertion head will move down along the center position of the pipe string, which can keep the insertion head in the center position and facilitate the insertion of the insertion head into the valve core. However, sometimes the float shoe valve core is not located in the center position, resulting in the insertion head being unable to be smoothly inserted into the valve core, and subsequent cementing operations cannot be performed. Summary of the invention

[0004] The purpose of the present invention is to provide a valve core centralizer for making a float shoe, so as to alleviate the technical problem that an insertion head is difficult to smoothly insert into the interior of a float shoe valve core and subsequent cementing operations cannot be performed.

[0005] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] The present invention provides a valve core centralizer for making a float shoe, comprising: a center rod, an insert tube, a clamping plate, a clamping mechanism and at least three support rods, wherein the insert tube is fixedly connected to the lower end of the center rod;

[0007] Each of the support rods is distributed around the central rod, and the lower end of each of the support rods is hinged to the central rod, and each of the support rods can swing up and down relative to the central rod;

[0008] The clamping plate is installed on the center rod, and the clamping mechanism can drive the clamping plate to move downward along the center rod; each of the support rods can abut against the clamping plate, and when each of the support rods abuts against the clamping plate, the angles between each of the support rods and the center rod are equal.

[0009] In a preferred embodiment, the center rod is a screw rod, and the clamping mechanism includes a locking nut installed on the screw rod, and the locking nut is arranged above the clamping plate, and the locking nut can apply downward pressure to the clamping plate.

[0010] In a preferred embodiment, the valve core centralizer includes a plurality of ear plates, one end of each ear plate is fixedly connected to the center rod, and the lower end of each support rod is hinged to the ear plate.

[0011] In a preferred embodiment, the hinge axis of each of the support rods is perpendicular to the central rod, and the support rods are perpendicular to their hinge axes.

[0012] In a preferred embodiment, each of the support rods intersects with the central rod at one point.

[0013] In a preferred embodiment, the lengths of the support rods are equal.

[0014] In a preferred embodiment, the valve core centralizer includes four support rods evenly distributed around the central rod.

[0015] In a preferred embodiment, the valve core centralizer includes a material blocking plate fixedly connected to the upper end of the insertion tube.

[0016] In a preferred embodiment, the valve core centralizer includes a plurality of springs, the lower ends of the springs are fixedly connected to the upper ends of the support rods, and the upper ends of the springs are fixedly connected to the upper ends of the center rods.

[0017] In a preferred embodiment, the pressing plate is an annular circular plate.

[0018] The characteristics and advantages of the present invention are:

[0019] By using the valve core straightener for making a float shoe, the float shoe valve core can be straightened during the float shoe making process, thereby preventing the float shoe valve core from tilting, improving the centering degree of the float shoe valve core in the float shoe, improving the float shoe making quality, and reducing the difficulty of on-site cementing operations; during the float shoe making process, the insertion tube can cooperate with the float shoe valve core to straighten the float shoe valve core, thereby preventing the float shoe valve core from tilting during the process of adding concrete, and no manual straightening is required during the concrete pouring process; thus, the making difficulty is reduced and the making efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1-Figure 6 A schematic diagram of the working of the valve core centralizer for making a float shoe provided by the present invention;

[0022] Figure 7 A front view of a valve core centralizer for making a float shoe provided by the present invention;

[0023] Figure 8 for Figure 7 A top view of a valve core centralizer for making a float shoe is shown;

[0024] Fig. 9 for Figure 7 A bottom view of a valve core centralizer for making a float shoe is shown;

[0025] Figure 10-11 for Figure 7 The schematic diagram of the structure of the clamping plate in the valve core centralizer used to make the float shoe is shown;

[0026] Fig.12 for Figure 7 The structural schematic diagram of the support rod in the valve core centralizer used to make the float shoe is shown;

[0027] Fig.13 for Figure 7 The structural schematic diagram of the locking nut in the valve core centralizer used to make the float shoe is shown;

[0028] Fig.14 for Figure 7 The structure schematic diagram of the ear plate in the valve core centralizer used to make the floating shoe is shown.

[0029] Description of Figure Numbers:

[0030] 11. Float shoe pipe body; 12. Float shoe valve core; 13. Concrete;

[0031] 21. Center rod; 22. Screw rod;

[0032] 31. Insertion tube; 32. Baffle plate;

[0033] 41. Support rod; 42. Ear plate; 43. Pin shaft;

[0034] 50. Pressing plate;

[0035] 60. Clamping mechanism; 61. Locking nut;

[0036] 70. Spring. 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] The present invention provides a valve core centralizer for making a float shoe, such as Figure 7-Figure 9 As shown, the valve core straightener includes: a center rod 21, an insert tube 31, a clamping plate 50, a clamping mechanism 60 and at least three support rods 41, the insert tube 31 is fixed to the lower end of the center rod 21; each support rod 41 is distributed around the center rod 21, and the lower end of each support rod 41 is hinged to the center rod 21, and each support rod 41 can swing up and down relative to the center rod 21; the clamping plate 50 is installed on the center rod 21, and the clamping mechanism 60 can drive the clamping plate 50 to move downward along the center rod 21; each support rod 41 can abut against the clamping plate 50, and when each support rod 41 abuts against the clamping plate 50, the angles between each support rod 41 and the center rod 21 are equal.

[0039] When making floating shoes, Figure 1-Figure 6 As shown, the valve core is placed inside the float shoe tube body 11, and the bottom is constrained and fixed; the valve core straightener is installed above the float shoe valve core 12, and the insertion tube 31 is inserted into the float shoe valve core 12; the clamping mechanism 60 drives the clamping plate 50 to move downward, and the support rod 41 swings downward under the action of the clamping plate 50, and each support rod 41 is unfolded outward, and the support rod 41 abuts and cooperates with the side wall of the float shoe tube body 11. The support rod 41 is constrained by the side wall of the float shoe tube body 11 and the clamping plate 50 at the same time. The number of support rods 41 is at least three and they are distributed around the center rod 21. The angles between each support rod 41 and the center rod 21 are equal, so that the center rod 21 is maintained at the center position of the float shoe tube body 11, and the float shoe valve core 12 is maintained at the center position of the float shoe tube body 11 by the insertion tube 31; concrete 13 is added to the inside of the float shoe tube body 11, and the valve core straightener can be taken out after the concrete 13 is added until the concrete 13 is initially set.

[0040] By means of the valve core straightener, the float shoe valve core 12 is straightened during the float shoe manufacturing process, thereby preventing the float shoe valve core 12 from tilting, improving the centering degree of the float shoe valve core 12 in the float shoe, improving the float shoe manufacturing quality, and reducing the difficulty of on-site cementing operations; during the float shoe manufacturing process, the insertion tube 31 can cooperate with the float shoe valve core 12, and the insertion tube 31 can cooperate with the inner hole of the float shoe valve core 12, so that the float shoe valve core 12 can be concentric with the center of the valve core straightener and cooperate closely, and the float shoe valve core 12 is straightened to avoid the float shoe valve core 12 from tilting during the process of adding concrete 13, and no manual straightening is required during the pouring of concrete 13; the manufacturing difficulty is reduced and the manufacturing efficiency is improved.

[0041] The clamping plate 50 is driven downward by the clamping mechanism 60, so that the support rod 41 is expanded outward, which can increase the diameter of the circular area covered by the support rod 41, making it easier for the support rod 41 to match with the float shoe tube body 11 with a larger inner diameter, so that the valve core centralizer can be applied to float shoes of different sizes, expanding the scope of use.

[0042] The structural form of the clamping mechanism 60 is not limited to one. For example, in one embodiment, the clamping mechanism 60 uses a hydraulic cylinder, the piston rod of the hydraulic cylinder cooperates with the clamping plate 50, and the piston rod moves up and down to drive the clamping plate 50 to move together; in another embodiment, the clamping mechanism 60 includes a motor, and the motor drives the clamping plate 50 to move up and down.

[0043] The inventor has made further improvements to the clamping mechanism 60: the central rod 21 is a screw rod 22, and the clamping mechanism 60 includes a locking nut 61 installed on the screw rod 22. The locking nut 61 is arranged above the clamping plate 50. The locking nut 61 can apply downward pressure to the clamping plate 50. Rotating the locking nut 61 can drive the clamping plate 50 to move downward. The screw rod 22 can be a threaded screw rod, such as Figure 7 and Fig.13 As shown, the locking nut 61 is preferably a thickened hexagonal head nut.

[0044] like Figure 7 , Fig. 9 and Fig.14 As shown, the valve core centralizer includes a plurality of ear plates 42, one end of the ear plate 42 is fixed to the center rod 21, and the lower end of the support rod 41 is hinged to the ear plate 42. Specifically, the ear plate 42 is welded to the screw rod 22 for connecting the support rod 41, and a hole for inserting a pin 43 is provided on the ear plate 42; the pin 43 hinges the ear plate 42 and the support rod 41 together, and the pin 43 serves as the hinge axis of the support rod 41, and the support rod 41 can rotate around the pin 43.

[0045] Furthermore, the hinge axis of each support rod 41 is perpendicular to the central rod 21, and the support rod 41 is perpendicular to its hinge axis. Figure 7 and Fig. 9 As shown, each support rod 41 can swing up and down synchronously around the hinge axis under the action of the clamping plate 50. Each support rod 41 intersects with the center rod 21 at one point, and when the support rod 41 rotates with the clamping plate 50, the angles between each support rod 41 and the center rod 21 are equal.

[0046] When the support rod 41 contacts the float shoe body 11, the side wall of the support rod 41 may overlap the float shoe body 11, or the end of the support rod 41 may abut against the inner wall of the float shoe body 11. In one embodiment, the lengths of the support rods 41 are equal, so that the upper ends of the support rods 41 are located on the same circle in the horizontal direction. During the expansion process, the center of the circle drawn by each point on the upper end of each support rod 41 is located on the axis of the center rod 21. The locking nut 61 drives the clamping plate 50 to move downward, and the clamping plate 50 drives the support rod 41 to expand outward. The support rod 41 is supported in the inner wall of the float shoe body 11. Since the lengths of the support rods 41 are consistent, the pitch circle at the end of the support rod 41 is concentric with the center of the valve core centralizer, which has the effect of automatic centering, can save manual adjustment and measurement links, reduce production errors, and improve work efficiency.

[0047] In one embodiment, the valve core stabilizer includes four support rods 41 evenly distributed around the center rod 21. The inner side of the support rod 41 cooperates with the clamping plate 50, and the outer side of the support rod 41 cooperates with the float shoe tube body 11, thereby ensuring the centering degree of the clamping plate 50 and the center rod 21.

[0048] like Figure 5 and Figure 7 As shown, the valve core straightener includes a baffle plate 32 fixed to the upper end of the insertion tube 31. The baffle plate 32 can be located at the upper end of the float shoe valve core 12 to prevent concrete from falling onto the upper surface or the interior of the float shoe valve core 12 when the concrete 13 is added, so as to keep the interior of the float shoe valve core 12 clean and the various functions normal. The upper part of the baffle plate 32 is connected to the center rod 21, and the lower part of the baffle plate 32 is connected to the insertion tube 31, both of which are connected in the center. The outer diameter of the baffle plate 32 matches the upper end of the float shoe valve core 12. The baffle plate 32 is preferably a circular structure, and the baffle plate 32 is welded to the insertion tube 31. The insertion tube 31 is a tubular structure, and the outer diameter of the insertion tube 31 can match the inner diameter of the float shoe valve core 12.

[0049] In one embodiment, the valve core centralizer includes a plurality of springs 70, the lower ends of the springs 70 are fixedly connected to the upper ends of the support rods 41, and the upper ends of the springs 70 are fixedly connected to the upper ends of the center rods 21. Figure 2 As shown, the spring 70 is in a stretched state, so that the support rod 41 has a tendency to swing upward, so that the support rod 41 remains in contact with the clamping plate 50, and the support rod 41 moves with the clamping plate 50. The valve core centralizer has a reset function through the spring 70. When the valve core centralizer is collected, the support rod 41 can be automatically tightened under the action of the spring 70, reducing the volume and facilitating storage and management. The spring 70 can be a steel spring 70.

[0050] like Figure 8 , Fig.10 and Fig.11 As shown, the pressing plate 50 is an annular circular plate. Figure 7 As shown, each support rod 41 is in contact with the circular side wall of the clamping plate 50, so that the angles between each support rod 41 and the center rod 21 are equal. The center rod 21 passes through the center hole of the clamping plate 50, and the clamping plate 50 moves up and down under the guidance of the center rod 21. Fig.12 As shown, the support rod 41 is preferably a square steel, the lower end of the support rod 41 is processed into a U-shaped structure that matches the ear plate 42, and the lower end of the support rod 41 is processed with a pin hole for connecting the pin shaft 43.

[0051] According to the well depth, well conditions and specific location, and taking into account the economic and technical conditions, the valve core centralizer used to make the float shoe is used for construction, and the beneficial effects of the valve include: timeliness, which is conducive to solving the problem of limited operation time during offshore wind and wave periods; low cost, reducing operation time, labor, machinery and other costs; it can improve the centering of the valve core in the float shoe, which helps to reduce the difficulty of operation and improve the quality of cementing.

[0052] 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 valve core centralizer for making a float shoe, characterized in that: It comprises: a central rod, an inserting tube, a pressing plate, a pressing mechanism and at least three supporting rods, wherein the inserting tube is fixedly connected to the lower end of the central rod; Each of the support rods is distributed around the central rod, and the lower end of each of the support rods is hinged to the central rod, and each of the support rods can swing up and down relative to the central rod; The clamping plate is mounted on the center rod, and the clamping mechanism can drive the clamping plate to move downward along the center rod; each of the support rods can abut against the clamping plate, and when each of the support rods abuts against the clamping plate, the angles between each of the support rods and the center rod are equal; The central rod is a screw rod, and the clamping mechanism includes a locking nut mounted on the screw rod, the locking nut is arranged above the clamping plate, and the locking nut can apply downward pressure to the clamping plate; The valve core centralizer comprises a plurality of ear plates, one end of each ear plate is fixedly connected to the central rod, and the lower end of each support rod is hinged to the ear plate.

2. The valve core centralizer for making a float shoe according to claim 1, characterized in that: The hinge axis of each support rod is perpendicular to the central rod, and the support rod is perpendicular to its hinge axis.

3. The valve core centralizer for making a float shoe according to claim 2, characterized in that: Each of the support rods intersects with the central rod at one point.

4. The valve core centralizer for making a float shoe according to claim 3, characterized in that: The lengths of the support rods are all equal.

5. The valve core centralizer for making a float shoe according to claim 1, characterized in that: The valve core centralizer includes four support rods evenly distributed around the central rod.

6. The valve core centralizer for making a float shoe according to claim 1, characterized in that: The valve core centralizer comprises a material blocking plate fixedly connected to the upper end of the insertion tube.

7. The valve core centralizer for making a float shoe according to claim 1, characterized in that: The valve core centralizer comprises a plurality of springs, the lower ends of the springs are fixedly connected to the upper ends of the support rods, and the upper ends of the springs are fixedly connected to the upper ends of the center rods.

8. The valve core centralizer for making a float shoe according to claim 1, characterized in that: The pressing plate is an annular circular plate.

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