High pressure type float collar float shoe device

Abstract

The application discloses a high-pressure type float collar and float shoe device, which comprises a float collar body and a float shoe body, and connecting threads are arranged on the float collar and float shoe bodies; a guide head is threadedly connected to the upper end of the float shoe body; threads are arranged on the inner and outer sides of the float collar and float shoe body; a valve seat body, a valve core guide seat, a valve core arranged between the valve core guide seat and the valve seat body, and a compression spring sleeved on the valve core guide seat and used for adjusting the fitting and compression of the valve core to the valve seat body are arranged in the float collar body; and a retreat-stop spring used in cooperation with the valve core is arranged on the valve seat body. In the application, the retreat-stop spring matched with the sealing head of the valve core is arranged in the valve seat body, the retreat-stop spring is installed in the middle part of the valve seat, and the retreat-stop spring is close to the axial seal, so that the thrust of the compression spring and the pressure in the opposite direction together push the valve core upward, thereby achieving better sealing effect; in addition, the size of the guide seat is lengthened in the application, so that the stability of the valve rod guide is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield development cementing operation, and particularly relates to a high-pressure type float collar float shoe device. BACKGROUND

[0002] The pressure of the previous float collar float shoe is generally within 35Mp during cementing, and the pressure bearing capacity of the float collar float shoe is about 50Mp or even higher with the increase of the well depth. In this case, the high pressure will cause leakage, poor sealing and failure. SUMMARY

[0003] The present application aims to provide a high-pressure type float collar float shoe device, which solves the problem that the conventional float collar float shoe device cannot meet the high-pressure use environment at the present stage.

[0004] To solve the above technical problems, the present application adopts the following technical scheme:

[0005] The present application provides a high-pressure type float collar float shoe device, which comprises a float collar body and a float shoe body, and the float collar float shoe shell body is provided with connecting threads on both sides; the float shoe body is provided with a guide head at the upper end; the float collar float shoe shell body is provided with threads on both the inner side and the outer side; a valve seat body, a valve core guide seat, a valve core arranged between the valve core guide seat and the valve seat body, and a compression spring arranged on the valve core guide seat to adjust the fitting and compression of the valve core to the valve seat body are arranged in the float collar body.

[0006] A retreat spring matched with the valve core is arranged on the valve seat body.

[0007] In the embodiment, the main body structure of the float collar body and the float shoe body is further optimized.

[0008] In the embodiment, the valve core guide seat further comprises a connecting sleeve and a guide seat integrally formed with the connecting sleeve, and the length of the guide seat is L.

[0009] In the embodiment, a spline groove is further arranged in the guide seat.

[0010] In the embodiment, the valve core further comprises a valve rod and a valve core sealing head arranged at the end of the valve rod, and the other end of the valve rod is inserted into the spline groove; the compression spring is arranged outside the guide seat and tightly presses the bottom of the valve core sealing head.

[0011] In the embodiment, a retreat spring matched with the valve core sealing head is further arranged in the valve seat body.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are as follows: In this application, a backstop spring adapted to the valve core sealing head is provided in the valve seat body for limiting the backstop spring. The backstop spring is installed in the middle of the valve seat for limiting the backstop spring, which is close to the axial seal. In this way, the thrust of the compression spring and the pressure when it is reversed push the valve core upward together, thereby achieving a better sealing effect. In addition, in this application, the stability of the valve stem is enhanced by lengthening the guide seat. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the main body of the high-pressure type floating hoop and floating shoe device of the present invention;

[0015] Figure 2 This is a schematic diagram of the main body adjustment of the high-pressure type floating hoop and floating shoe device of the present invention;

[0016] Figure 3 This is a partially enlarged schematic diagram of the high-pressure type floating hoop and floating shoe device of the present invention;

[0017] Figure 4 This is a schematic diagram of the valve core structure of the high-pressure type float hoop and float shoe device of the present invention;

[0018] Figure 5 This is a schematic cross-sectional view of the valve core guide seat of the high-pressure type floating hoop and floating shoe device of the present invention;

[0019] Figure 6 This is a side view of the valve core guide seat of the high-pressure type float hoop and float shoe device of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. Float hoop body; 2. Valve seat body; 3. Valve core guide seat; 3a. Guide seat; 3b. Connecting sleeve; 4. Compression spring; 5. Valve core; 5a. Valve stem; 5b. Valve core sealing head; 5c. Annular groove; 6. Anti-reverse spring. Detailed Implementation

[0021] like Figures 1-6 As shown, this embodiment discloses a high-pressure type float hoop and float shoe device, including a float hoop body 1 and a float shoe body. The upper edge of the float hoop and float shoe shells are both connected with threads. The upper end of the float shoe body is threaded with a guide head. The float hoop and float shoe shells are threaded on both the inner and outer sides. A valve seat body 2, a valve core guide seat 3, a valve core 5 installed between the valve core guide seat 3 and the valve seat body 2, and a compression spring 4 sleeved on the valve core guide seat 3 to adjust the valve core 5 to adapt and press against the valve seat body 2.

[0022] A retaining spring 6, which works in conjunction with the valve core 5, is installed on the valve seat body 2.

[0023] In the embodiment, the float collar body 1 and the float shoe body have the same main structure, and the structural difference is that the guide head is threadedly connected to the upper end of the float shoe body.

[0024] In the embodiment, the valve core guide seat 3 comprises a connecting sleeve 3b and a guide seat 3a integrally formed with the connecting sleeve 3b, wherein the connecting sleeve 3b on the valve core guide seat 3 is threadedly connected to the left end of the valve seat body 2; the length of the guide seat 3a is 50-80 mm, and preferably 70 mm in the embodiment, wherein the guide seat 3a is lengthened (from 35 mm to 70 mm) compared with the original design, thereby enhancing the stability of the guide of the valve rod 5a.

[0025] As shown in Figure 6 In the embodiment, a spline groove is formed in the guide seat 3a, the valve core 5 comprises a valve rod 5a and a valve core sealing head 5b mounted at the end of the valve rod 5a, and the other end of the valve rod 5a is inserted into the spline groove, so that the valve rod 5a is limited by the spline groove, thereby preventing rotation during operation.

[0026] As shown in Figure 4 The valve core sealing head 5b has an arc structure that is sealed and received by the valve seat body 2, the valve core sealing head 5b is integrally formed, and specifically comprises a conical section and a circular arc section at the end of the conical section and adapted to be inserted into the stop spring 6; and a ring groove 5c is formed at the left end of the conical section, and the ring groove 5c is used to mount a sealing ring, thereby increasing the sealing property between the conical section and the valve seat body 2.

[0027] The compression spring 4 is sleeved outside the guide seat 3a and abuts against the bottom of the valve core sealing head 5b; the stop spring 6 adapted to the valve core sealing head 5b is limitedly mounted in the valve seat body 2, and the stop spring 6 is limitedly mounted in the middle of the valve seat 2 and close to the axial seal, so that the thrust of the compression spring 4 and the pressure in the reverse direction together push the valve core 5 upward, thereby achieving better sealing effect.

[0028] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0029] The above embodiments are only to describe the preferred modes of the present application, and are not intended to limit the scope of the present application. Any modification and improvement of the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application.

Claims

1. A high pressure type float collar float shoe device, comprising a float collar body and a float shoe body, the float collar float shoe body having a connecting thread on both the inner and outer sides, wherein the upper end of the float shoe body is threadedly connected with a guide head, the float collar float shoe body having a thread on both the inner and outer sides, characterized in that: The valve seat body, the valve core guide seat, the valve core arranged between the valve core guide seat and the valve seat body, and the compression spring sleeved on the valve core guide seat to adjust the fitting compression of the valve core to the valve seat body are arranged in the floating collar body; the stop spring used in cooperation with the valve core is arranged on the valve seat body; the valve core comprises a valve rod and a valve core sealing head mounted on one end of the valve rod; the stop spring adapted to the valve core sealing head is arranged in the valve seat body in a limiting manner; ​ The valve core sealing head (5b) is an arc-shaped structure sealed and received by the valve seat body (2), the valve core sealing head (5b) is integrally made, and specifically comprises a conical section and a circular arc section located at the end of the conical section and adapted to be inserted into the stop spring (6); a ring-shaped groove (5c) is formed at the left end of the conical section, and the ring-shaped groove (5c) is used for mounting a sealing ring, so as to increase the sealing property between the conical section and the valve seat body (2).

2. The high-pressure type float collar float shoe assembly of claim 1, wherein: The main body structure of the floating collar body and the floating shoe body is the same.

3. The high-pressure type float collar float shoe assembly of claim 2, wherein: The valve core guide seat comprises a connecting sleeve and a guide seat integrally formed with the connecting sleeve, and the length of the guide seat is 50mm-80mm.

4. The high-pressure type float collar float shoe assembly of claim 3, wherein: A spline groove is formed in the guide seat.

5. The high-pressure type float collar float shoe assembly of claim 4, wherein: The other end of the valve rod is inserted into the spline groove, and the compression spring is sleeved outside the guide seat and abuts against the bottom of the valve core sealing head.

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