Automatic guiding shoe
By designing automatic guide shoes, the structural design of the track cylinder and guide shoes assists in rotating and straightening the sealing short section, the problem of difficult sealing short sections when the inner diameter of the wellbore is large, and the smooth insertion of the sealing short section is achieved.
Patent Information
- Application Number
- CN202422621670.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-29
AI Technical Summary
In the case of large inner diameter of the wellbore, it is difficult to insert the sealing short section back into the sealing cylinder, especially in the permanent packer completion process, the sealing short section is pushed to the upper end of the sealing cylinder due to the inclined well, resulting in difficulty in inserting back into the cylinder.
An automatic guide guide shoe is designed. By setting ring grooves, springs, upper rails, lower rails and guide rails in the track cylinder and guide shoe, the guiding role of the track pins assist in the rotation of the sealing short section and straightening it into the sealing cylinder.
It realizes that the automatic guide shoe can rotate under the guidance of the guide rail when the inner diameter of the wellbore is large, solving the problem that the sealing short section is difficult to insert back, and ensuring that the sealing short section smoothly enters the sealing short section.
Smart Images
Figure CN223164499U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of well completion tools for oilfield development, and particularly relates to an automatic guiding guide shoe for guiding the back insertion of tools such as a sealing nipple. Background Art
[0002] At present, in well completion processes such as permanent packer well completion, there is a well completion process in which a sealing cylinder is provided above the packer, and a sealing nipple is inside the sealing cylinder. The sealing nipple can be withdrawn from the sealing cylinder and can also be inserted back into the sealing cylinder. When the inner diameter of the wellbore is large for back insertion operations, due to the well deviation, the sealing nipple will abut against the upper end of the sealing cylinder and it is difficult to insert it back. Summary of the Utility Model
[0003] In order to solve the above technical problems, an automatic guiding guide shoe is invented. It is connected below the sealing nipple to assist the sealing nipple in back insertion operations, and solves the problem that it is difficult for the sealing nipple to be inserted back into the sealing cylinder when the inner diameter of the wellbore is large for back insertion operations.
[0004] To achieve the above object, the utility model adopts the following technical solutions:
[0005] An automatic guiding guide shoe, in which a track cylinder and a guide shoe are sleeved. A ring groove is arranged inside the guide shoe below the track cylinder, a spring is placed in the ring groove, and there is an inclined notch at the lower end of the guide shoe; an upper track and a lower track are arranged on the outer wall of the track cylinder, and a guiding track is arranged on the upper part of the guide shoe. The structural dimensions of the upper track and the guiding track are the same; in the developed view of the outer circumference of each track, the shapes of the upper track and the guiding track are isosceles triangles, and the shape of the lower track is a right triangle. The track angles of the upper track, the guiding track and the lower track are the same; below the guiding track, a track pin is radially installed on the side wall of the guide shoe, and the head of the track pin extends into the lower track. In the developed view of the outer circumference of each track, the included angle between the track pin and the lower dead point of the guiding track is 10° to 30°.
[0006] Preferably, the track angles of the upper track, the guiding track and the lower track are 90° or 60°, and the track pins are symmetrically arranged in two. The included angle between the track pin and the lower dead point of the guiding track is 10° to 15°.
[0007] Compared with the prior art, the advantages of the utility model are as follows:
[0008] The automatic guiding shoe of the present utility model is connected below the sealing nipple. Due to the provision of the guiding track, during wellhead probing, when the shoe abuts against the upper end of the sealing cylinder and cannot enter it, by applying a downward load, the shoe will rotate under the guidance of the guiding track. When the automatic guiding shoe is lifted, the track pin will move along the lower track under the action of the spring, thereby driving the shoe to further rotate. When the automatic guiding shoe is lowered again, when the inclined notch of the shoe first contacts the upper end of the sealing cylinder, the automatic guiding shoe will automatically right itself and enter the sealing cylinder, thus solving the problem of difficult back insertion into the sealing cylinder during back insertion operation in the case of a relatively large wellbore inner diameter.
[0009] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings
[0010] When considered in conjunction with the accompanying drawings, by referring to the following detailed description, the present utility model can be more fully understood and many of its attendant advantages can be easily known. However, the drawings described herein are used to provide a further understanding of the present utility model and constitute a part of the present utility model. The illustrative embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model.
[0011] Figure 1 is a schematic structural diagram of an automatic guiding shoe of the present utility model.
[0012] Figure 2 is a schematic structural diagram of the track cylinder.
[0013] Figure 3 is Figure 2 the sectional view at A-A in
[0014] Figure 4 is Figure 2 the sectional view at B-B in
[0015] Figure 5 is a schematic structural diagram of the shoe.
[0016] Figure 6 is the outer peripheral development diagram of each track.
[0017] In the figure: 1 - track cylinder, 2 - track pin, 3 - spring, 4 - shoe, 5 - upper track, 6 - lower track, 7 - guiding track. Specific Embodiments
[0018] In the present application specification and claims, the "upper" and "lower" in terms of positional relationship are described in the state when the tool is in use, and will not be repeated one by one in the following description.
[0019] Embodiment 1
[0020] See Figure 1As shown in the figure, an automatic guiding shoe of the utility model has a tubular rail cylinder 1 and a tubular guiding shoe 4 which are sleeved with each other. A ring groove is arranged inside the guiding shoe below the rail cylinder, a spring 3 is placed in the ring groove, and the lower end of the guiding shoe has an inclined notch. Upper rail 5 and lower rail 6 are arranged on the outer wall of the rail cylinder, and guiding rail 7 is arranged on the upper part of the guiding shoe. The upper rail 5 and the guiding rail 7 have the same structural dimensions. Below the guiding rail 7, a rail pin 2 is radially installed on the side wall of the guiding shoe, and the head of the rail pin extends into the lower rail.
[0021] See Figure 6 As shown in the figure, this is a schematic diagram of the outer periphery expansion of each rail. The left column is the expansion diagram of the upper rail 5, the middle column is the expansion diagram of the guiding rail 7, and the right column is the expansion diagram of the lower rail 6. The circles in the figure are the limit positions of the rail pins or the processing circular milling cutters at the intersection points of each rail, also known as the top dead center and the bottom dead center. The connecting line (dotted line) of the centers of the circles is their trajectory.
[0022] On the outer periphery expansion diagram of each rail, the shapes of the upper rail 5 and the guiding rail 7 are both isosceles triangles, and the rails are the two equal sides of the isosceles triangles. The included angles between the two equal sides are the same. The so-called included angle between the two equal sides refers to the central angle formed by the connecting lines of two adjacent bottom dead centers or top dead centers and the center of the circle of the plane perpendicular to the axis of the rail cylinder where they are located. The shape of the lower rail 6 is a right triangle, and the rails are one right side and one hypotenuse of the right triangle. The rail included angle of the lower rail 6 is also the central angle formed by the connecting lines of two adjacent bottom dead centers or top dead centers and the center of the circle of the plane perpendicular to the axis of the rail cylinder where they are located. The rail included angles of the upper rail 5, the guiding rail 7 and the lower rail 6 are the same, all being δ. The value of δ is 360° divided by the number of top dead centers (or bottom dead centers). The included angles mentioned in this article have the same meaning as above.
[0023] On the outer periphery expansion diagram of each rail, the included angle θ between the rail pin and the bottom dead center of the guiding rail is 10° to 30°.
[0024] Embodiment 2
[0025] Embodiment 2 is a preferred embodiment of Embodiment 1. See Figure 6 As shown in the figure, on the premise that other technical features remain unchanged, its preference lies in that: the rail included angle δ of the upper rail 5, the guiding rail 7 and the lower rail 6 is 90°, and the rail pins are symmetrically arranged in 2 pieces.
[0026] Embodiment 3
[0027] Embodiment 3 is a preferred embodiment of Embodiment 1. On the premise that other technical features remain unchanged, its preference lies in that: the rail included angle δ of the upper rail 5, the guiding rail 7 and the lower rail 6 is 60°, and the rail pins are symmetrically arranged in 2 pieces.
[0028] Embodiment 4
[0029] Embodiment 4 is a preferred embodiment of Embodiment 1. Refer to Figure 6 As shown, with other technical features unchanged, its preference is that the included angle between the track pin and the bottom dead center of the guiding track is 10° to 15°.
[0030] Obviously, many modifications and variations made by those skilled in the art based on the purpose of the present utility model fall within the protection scope of the present utility model.
Claims
1. An automatic guiding pilot shoe, characterized in that, The track cylinder (1) and the guide shoe (4) are sleeved. A ring groove is arranged inside the guide shoe below the track cylinder, and a spring (3) is placed in the ring groove. The lower end of the guide shoe has an inclined notch. An upper track (5) and a lower track (6) are arranged on the outer wall of the track cylinder, and a guide track (7) is arranged on the upper part of the guide shoe. The structural dimensions of the upper track (5) and the guide track (7) are the same. In the developed view of the outer circumference of each track, the shapes of the upper track (5) and the guide track (7) are isosceles triangles, and the shape of the lower track (6) is a right triangle. The track angles of the upper track (5), the guide track (7) and the lower track (6) are the same. Below the guide track (7), a track pin (2) is radially installed on the side wall of the guide shoe. The head of the track pin extends into the lower track. In the developed view of the outer circumference of each track, the included angle between the track pin and the lower dead point of the guide track is 10° to 30°.
2. The automatic guiding shoe according to claim 1, characterized in that, The track angles of the upper track (5), the guide track (7) and the lower track (6) are 90°, and the two track pins are symmetrically arranged.
3. An automatic guiding shoe according to claim 1, characterized in that, The track angles of the upper track (5), the guide track (7) and the lower track (6) are 60°, and the two track pins are symmetrically arranged.
4. An automatic guiding guide shoe according to claim 1, characterized in that, The included angle between the track pin and the lower dead point of the guide track is 10° to 15°.