Elastic float collar float shoe for well cementation

Abstract

The elastic float collar float shoe comprises a pipe body and a cement layer, an opening is formed in the bottom side of the cement layer, a connecting rod is movably connected to the bottom side of the cement layer in an inserted mode, a buffering sleeve is fixedly connected to the bottom end of the connecting rod, a first spring is connected to the connecting rod in a sleeved mode, and the two ends of the first spring make contact with the cement layer and the buffering sleeve respectively. The bottom side of the pipe body is fixedly connected with a buffer sleeve, the bottom side of the buffer sleeve is fixedly connected with a rubber ring, the upper side of the buffer sleeve is provided with a through hole, a spring rod is inserted into the through hole, the end of the spring rod is inserted with a positioning hole, the positioning hole is located on the inner side of the pipe body, the bottom side of the cement layer is provided with an annular concave part, and the annular concave part is in contact with a cushion sleeve. And then the rubber ring is installed on the outer side of the buffer sleeve, pipeline deviation caused by collision can be increased, the stability of the float collar float shoe is improved, meanwhile, the spring rod is inserted into the positioning hole, when the float collar float shoe enters the bottom side of a well hole, the buffer sleeve can be completely shrunk, and follow-up operation is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of floating collars and floating shoes, in particular to an elastic floating collar and floating shoe for cementing. Background Art

[0002] Float collars and float shoes are important components in oil drilling and production equipment, and are also necessary tools for cementing construction. They are usually connected at a certain distance from the end of the casing string to straighten the casing and prevent cement slurry backflow.

[0003] According to the Chinese patent publication number CN218816334U "A kind of elastic floating collar and floating shoe for cementing", it is mainly described that the valve seat is directly processed inside the cylinder by separate installation of the cylinder and the cement head, and a strip groove is opened on the relatively thick pipe wall outside the valve seat for installing the elastic support arm. After the elastic support arm is lowered into the well, the unsealing pin dissolves at a certain temperature and chloride ions, and the elastic support arm opens to play the role of a casing centralizer, ensuring the quality of cementing and reducing operating costs. The limit pin prevents the cylinder and the cement head from rotating. After cementing, the elastic support arm is fixed in the cement layer. During the secondary drilling, the cylinder and the cement head will not rotate, ensuring smooth drilling. During the downward movement of the floating collar and the floating shoe, collisions will be encountered, resulting in the displacement of the floating shoe and the floating collar, which increases wear and tear and leads to poor stability of the floating shoe and the floating collar.

[0004] Therefore, an elastic floating collar and floating shoe for cementing is proposed to solve the problem that during the downward movement of the floating collar and floating shoe, collision and deviation may occur, which increases wear and leads to poor stability of the floating shoe and floating collar. Utility Model Content

[0005] The technical problem to be solved by the utility model is that during the downward movement of the floating collar and floating shoe, collision may occur, resulting in the displacement of the floating shoe and floating collar, increased wear, and poor stability of the floating shoe and floating collar. Therefore, an elastic floating collar and floating shoe for cementing is proposed.

[0006] The technical solution adopted by the utility model to solve the technical problem is: an elastic floating collar and floating shoe for cementing, comprising a pipe body and a cement layer, an opening being provided on the bottom side of the cement layer, a connecting rod being movably inserted into the bottom side of the cement layer, a buffer sleeve being fixedly connected to the bottom end of the connecting rod, a first spring being sleeved on the connecting rod, the two ends of the first spring respectively contacting the cement layer and the buffer sleeve, a rubber ring being fixedly connected to the bottom side of the buffer sleeve, a through hole being provided on the upper side of the buffer sleeve, a spring rod being inserted into the through hole, a positioning hole being inserted into the end of the spring rod, and the positioning hole being located inside the pipe body.

[0007] As a preferred technical solution of the present invention, an annular recess is provided on the bottom side of the cement layer, and the annular recess is in contact with a gasket, which is fixedly connected to the upper side of the buffer sleeve. By providing the annular recess and the gasket, the sealing effect can be increased.

[0008] As a preferred technical solution of the present invention, a limiting ring is fixedly connected to the bottom side of the cement layer, and the limiting ring corresponds to the gasket sleeve. By providing the limiting ring, the sealing effect of the gasket sleeve is further enhanced.

[0009] As a preferred technical solution of the present invention, a fixing ring is fixedly connected to the bottom side of the buffer sleeve, an annular recess is provided on the bottom side of the fixing ring, and four sides of the annular recess that are away from each other are fixedly connected to a telescopic rod, a second spring is sleeved on the telescopic rod, a stop sleeve is sleeved on the bottom end of the telescopic rod, and circular holes are evenly provided on the stop sleeve. By arranging the telescopic rod in conjunction with the second spring, the buffer sleeve and the tube body can have a buffering effect through contraction.

[0010] As a preferred technical solution of the present invention, the upper end of the blocking sleeve is fixedly connected to a connecting sleeve, and the connecting sleeve is movably inserted into the annular recess. By providing the connecting sleeve, gravel can be prevented from being stuck in the annular recess.

[0011] The utility model has the following advantages: by installing a first spring and a buffer sleeve on the bottom side of the pipe body, and then installing a rubber ring on the outside of the buffer sleeve, the pipeline deviation caused by collision can be reduced, and the stability of the float collar and float shoe can be improved. At the same time, the spring rod is provided to insert the positioning hole so that the buffer sleeve can be completely retracted when the float collar and float shoe enter the bottom side of the wellbore, which is convenient for subsequent operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic side cross-sectional structural diagram of an elastic floating collar and a floating shoe for cementing according to a preferred embodiment of the utility model;

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure of a retaining sleeve of an elastic floating collar and a floating shoe for cementing according to a preferred embodiment of the utility model;

[0014] Figure 3 The figure is a schematic diagram of the enlarged structure of point A of an elastic floating collar and floating shoe for cementing in a preferred embodiment of the present invention.

[0015] Explanation of the accompanying symbols: 1. Tube body; 2. Cement layer; 3. Opening; 4. Connecting rod; 5. First spring; 6. Buffer sleeve; 7. Rubber ring; 8. Through hole; 9. Spring rod; 10. Positioning hole; 11. Gasket; 12. Limiting ring; 13. Fixing ring; 14. Telescopic rod; 15. Second spring; 16. Stop sleeve; 17. Connecting sleeve. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Please refer to Figure 1-3 The elastic floating hoop and floating shoe for cementing shown in the figure includes a pipe body 1 and a cement layer 2, an opening 3 is provided on the bottom side of the cement layer 2, a connecting rod 4 is movably inserted into the bottom side of the cement layer 2, and a buffer sleeve 6 is fixedly connected to the bottom end of the connecting rod 4. By providing the buffer sleeve 6, the collision and rebound effects of the floating hoop and floating shoe can be increased, thereby increasing the stability of the casing. A first spring 5 is sleeved on the connecting rod 4, and the two ends of the first spring 5 contact the cement layer 2 and the buffer sleeve 6 respectively. A rubber ring 7 is fixedly connected to the bottom side of the buffer sleeve 6, and a through hole 8 is provided on the upper side of the buffer sleeve 6. A spring rod 9 is inserted in the through hole 8, and a positioning hole 10 is inserted at the end of the spring rod 9. The positioning hole 10 is located on the inner side of the pipe body 1. When the floating hoop and floating shoe is hit, the first spring 5 will be squeezed, and the buffer sleeve 6 and the rubber ring 7 will move upward, thereby providing buffering.

[0018] Among them, the upper side of the buffer sleeve 6 is fixedly connected to the gasket sleeve 11, which is made of rubber. The gasket sleeve 11 is in contact with the annular depression, which is located on the bottom side of the cement layer 2. By setting the gasket sleeve 11, the contact between the opening 3 and the buffer sleeve 6 is increased to prevent debris from entering the cement layer 2.

[0019] Among them, the cushion sleeve 11 corresponds to the limiting ring 12, and the limiting ring 12 is fixedly connected to the bottom side of the cement layer 2. By setting the limiting ring 12, the tightness of the connection between the opening 3 and the buffer sleeve 6 can be increased when the buffer sleeve 6 moves upward.

[0020] Among them, the circular holes are evenly located on the stop sleeve 16, the stop sleeve 16 is sleeved on the bottom end of the telescopic rod 14, the second spring 15 is sleeved on the outside of the telescopic rod 14, and the telescopic rod 14 is fixedly connected to the four sides away from each other in the annular recess. The annular recess is located on the bottom side of the fixing ring 13, and the fixing ring 13 is fixedly connected to the bottom side of the buffer sleeve 6. By setting the stop sleeve 16 and the circular holes on the bottom side of the stop sleeve 16, large particles of debris can be prevented from entering the sleeve when the sleeve moves downward.

[0021] The annular recess is movably connected with a connecting sleeve 17, which is fixedly connected to the upper end of the blocking sleeve 16. By providing the connecting sleeve 17, small particles of debris can be prevented from entering the annular recess and blocking the expansion and contraction of the second spring 15.

[0022] Working principle: When the pipe body 1 moves down in the wellbore along with the casing, it is hit by rocks inside the wellbore, which will cause the first spring 5 and the second spring 15 to contract, and then the buffer sleeve 6 moves up. At the same time, the cushion sleeve 11 moves up and is stuck in the annular depression on the bottom side of the cement layer 2 and is limited by the limiting ring 12 to achieve a buffering effect. When the float collar and float shoe touch the bottom, the first spring 5 will be further squeezed, and the spring rod 9 will move up. The end of the spring rod 9 is inserted into the positioning hole 10 to form a permanent limit. Then a gap appears between the float collar and float shoe and the bottom of the wellbore, which is convenient for subsequent operations.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0024] Other parts of the present invention that are not described in detail belong to the prior art and will not be described in detail here.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elastic floating collar and floating shoe for cementing, comprising a pipe body (1) and a cement layer (2), wherein an opening (3) is provided on the bottom side of the cement layer (2), characterized in that: A connecting rod (4) is movably connected to the bottom side of the cement layer (2), and a buffer sleeve (6) is fixedly connected to the bottom end of the connecting rod (4). A first spring (5) is sleeved on the connecting rod (4), and the two ends of the first spring (5) contact the cement layer (2) and the buffer sleeve (6) respectively. A rubber ring (7) is fixedly connected to the bottom side of the buffer sleeve (6). A through hole (8) is opened on the upper side of the buffer sleeve (6), and a spring rod (9) is inserted into the through hole (8). The end of the spring rod (9) is inserted with a positioning hole (10), and the positioning hole (10) is located on the inner side of the tube body (1).

2. The elastic float collar and float shoe for cementing according to claim 1, characterized in that: An annular recess is provided on the bottom side of the cement layer (2), and a cushion sleeve (11) is in contact with the annular recess. The cushion sleeve (11) is fixedly connected to the upper side of the buffer sleeve (6).

3. The elastic floating collar and floating shoe for cementing as claimed in claim 2, characterized in that: A limiting ring (12) is fixedly connected to the bottom side of the cement layer (2), and the limiting ring (12) corresponds to the gasket (11).

4. The elastic floating collar and floating shoe for cementing as claimed in claim 3, characterized in that: The bottom side of the buffer sleeve (6) is fixedly connected to a fixing ring (13), the bottom side of the fixing ring (13) is provided with an annular recess, four sides of the annular recess that are away from each other are fixedly connected to telescopic rods (14), a second spring (15) is sleeved on the telescopic rod (14), and a stop sleeve (16) is sleeved on the bottom end of the telescopic rod (14), and circular holes are evenly provided on the stop sleeve (16).

5. The elastic floating collar and floating shoe for cementing as claimed in claim 4, characterized in that: The upper end of the stop sleeve (16) is fixedly connected with a connecting sleeve (17), and the connecting sleeve (17) is movably plugged into the annular recess.

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