WO2021103043A1

WO2021103043A1 - Pressure maintaining coring device flap valve with multistage sealing structure

Info

Publication number: WO2021103043A1
Application number: PCT/CN2019/122341
Authority: WO
Inventors: 谢和平; 高明忠; 陈领; 张志龙; 吴年汉; 李聪; 李佳南; 何志强; 杨明庆; 余波; 胡云起; 黄伟
Original assignee: 深圳大学
Priority date: 2019-11-26
Filing date: 2019-12-02
Publication date: 2021-06-03
Also published as: CN110748653A; CN110748653B

Abstract

Disclosed is a pressure maintaining coring device flap valve with a multistage sealing structure, the flap valve comprising a valve seat (1) and a valve clack (2), wherein one end of the valve clack (2) is movably connected to the upper end of the valve seat (1); a valve port (11) matching the valve clack (2) is provided in the top of the valve seat (1); when the valve clack (2) is closed, at least two sealing pairs are formed between the valve seat (1) and the valve clack (2); sealing between the valve seat (1) and the valve clack (2) comprises hard sealing and soft sealing; at least two sealing members are arranged in the valve port (11) of the valve seat (1); the first sealing member (3) comprises a metal sealing ring (31) and a U-shaped sealing structure (32); when the valve clack (2) is closed, the valve clack (2) makes contact with the metal sealing ring (31) to form hard sealing, and at the same time, the valve clack (2) enables the metal sealing ring (31) to expand so as to extrude the U-shaped sealing structure (32) to form soft sealing. The valve seat (1) and the valve clack (2) are of the multi-stage sealing structure, and the sealing performance is reliable, multi-line/face sealing contact is achieved, and valve leakage can be effectively prevented; and the expandability of the metal sealing ring (31) effectively improves the deformation resistance of the sealing face, deformation generated by pressing of the valve clack (2) and the valve seat (1) can be compensated for during the pressing process, pressure leakage is avoided, and the flap valve is suitable for high-temperature and high-pressure working conditions.

Description

Pressure-maintaining core remover flap valve with multi-stage sealing structure

Technical field

The present invention relates to the technical field of core remover sealing devices, in particular to a pressure-maintaining core remover flap valve with a multi-stage sealing structure.

Background technique

At present, in the field of pressure keeping and coring, the upper end of the pressure keeping cylinder is generally sealed by a piston, and the lower end of the pressure keeping cylinder is usually sealed by a ball valve or a flap valve. The structure of the ball valve is relatively complicated and takes up a large space, which limits the diameter of the drilled core. The processing technology of the ball valve is demanding. When the pressure is high, the liquid in the pressure holding cylinder will seep out from the gap between the ball valve and the core cylinder. Cannot maintain higher pressure. Although the existing flap valve has a simple structure, it adopts a single sealing ring for sealing. If the sealing ring leaks at one place, the liquid in the core remover will leak and the pressure holding performance of the core remover will be damaged; Some flap valves are prone to seal failure under high temperature and high pressure environments.

Summary of the invention

The invention aims to provide a pressure-maintaining core remover flap valve with a multi-stage sealing structure, which adopts a multi-stage sealing structure, has reliable sealing performance, and is suitable for high-temperature and high-pressure environments.

In order to achieve the above objectives, the technical solutions adopted by the present invention are as follows:

A pressure-maintaining core remover flap valve with a multi-stage sealing structure includes a valve seat and a valve disc. One end of the valve disc is movably connected with the upper end of the valve seat, and the top of the valve seat has a valve port that matches the valve disc. When the valve disc is closed, At least two sealing pairs are formed between the valve seat and the valve flap, and the sealing between the valve seat and the valve flap includes a hard seal and a soft seal.

Preferably, at least two seals are installed in the valve port of the valve seat, and a sealing pair is formed when the valve disc is in contact with the seal.

Further, the last seal includes a sealing ring, and the valve port includes a tapered surface and a stepped surface;

When the valve flap is closed, the side of the valve flap forms a soft seal with the sealing ring, and the bottom surface of the valve flap contacts the step surface to form a hard seal on the end surface.

Further, the last seal also includes a J-shaped piece, the J-shaped piece and the sealing ring are installed on the step surface, the J-shaped piece is located between the sealing ring and the valve seat, and the J-shaped piece wraps a part of the sealing ring;

When the valve flap is closed, the side of the valve flap forms a soft seal with the sealing ring and the J-shaped piece, and the contact surface between the valve flap and the J-shaped piece is a conical surface.

Further, the first seal includes a metal seal ring, the valve port is provided with an annular groove for installing the first seal, the metal seal ring is installed in the annular groove, and the metal seal ring is used to protrude the sealing surface in contact with the valve flap On the valve port surface; when the valve flap is closed, the valve flap is in sealing contact with the metal sealing ring to form a hard seal.

Preferably, the contact surface between the metal sealing ring and the valve flap is a conical surface.

Further, the first seal also includes a U-shaped sealing structure, the U-shaped sealing structure is installed in the annular groove of the valve seat, and the metal sealing ring is located inside the U-shaped sealing structure;

The U-shaped sealing structure includes a U-shaped soft seal and a PTFE sealing ring. The cross-section of the U-shaped soft seal is U-shaped. The PTFE sealing ring is installed in the U-shaped groove of the U-shaped soft seal, with the U-shaped groove opening facing downwards. ; When the valve flap is closed, the valve flap expands the metal sealing ring to squeeze the U-shaped sealing structure to form a soft seal.

Preferably, the annular groove has a stepped structure, and when the valve flap is not closed, the inner annular surface of the U-shaped sealing structure protrudes from the step surface of the annular groove;

When the valve flap is closed, the metal sealing ring is forced to expand to abut against the step surface of the annular groove.

Further preferably, the material of the U-shaped soft seal is rubber, and the material of the tetrafluoroethylene sealing ring is polytetrafluoroethylene.

Preferably, the second seal has the same structure as the first seal.

Compared with the prior art, the present invention has the following beneficial effects:

1. In the present invention, the valve seat and the valve clack adopt a multi-stage sealing structure, with reliable sealing performance and multi-line/surface sealing contact. When a certain level of seal leaks, the other seal pairs still remain sealed, which can effectively prevent the valve from leaking;

2. The expandability of the metal sealing ring effectively improves the deformation resistance of the sealing surface. During the pressure application process, it can compensate for the deformation of the valve disc and valve seat under pressure to avoid pressure leakage. It is suitable for high temperature and high pressure working conditions.

Description of the drawings

Figure 1 is a three-dimensional view of the first embodiment;

Figure 2 is a cross-sectional view of the valve seat in the first embodiment;

Figure 3 is a partial enlarged view of A in Figure 2;

Figure 4 is a partial cross-sectional view of the valve seat when the seal is not installed;

Figure 5 is a schematic diagram of the valve flap in the process of closing;

Figure 6 is a partial cross-sectional view of the first embodiment when the valve flap is closed;

Figure 7 is a schematic diagram of the third embodiment when a ring magnet is installed on the valve seat;

Figure 8 is a schematic diagram of the third embodiment when a sheet magnet is installed on the valve seat.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings.

Example one

As shown in Figure 1, the pressure-maintaining core remover flap valve with a multi-stage sealing structure disclosed in this embodiment includes a valve seat 1 and a valve flap 2. One end of the valve flap 2 is movably connected to the upper end of the valve seat 1, and the valve flap 2 The valve seat 1 is movably connected to the valve seat 1 through the spring sheet 6 and the rotating shaft. The outer side wall of the top end of the valve seat 1 has a rotating shaft accommodating groove which is matched with the rotating shaft. The rotating shaft is installed in the rotating shaft accommodating groove, and the outer surface of the valve disc 2 has a spring sheet accommodating The elastic sheet accommodating groove of 6, the spring sheet 6 is installed in the elastic sheet accommodating groove. The spring sheet 6 is a curved steel sheet, and the curved steel sheet is stuck in the elastic sheet accommodating groove. Under the action of external force, the curved steel sheet can be straightened, and its curved surface can become a plane and completely adhere to the elastic sheet accommodating groove on the outer surface of the valve disc 2. Together.

In another embodiment, the valve flap 2 is hinged with the outer side wall of the upper end of the valve seat 1 via a pin shaft and a torsion spring.

There is a valve port 11 on the top of the valve seat 1 that matches with the valve disc 2. When the valve disc 2 is closed, at least two sealing pairs are formed between the valve seat 1 and the valve disc 2. The seal between the valve seat 1 and the valve disc 2 includes a hard seal And soft seal.

The seal can be arranged on the valve flap 2 or on the valve seat 1. In this embodiment, at least two seals are installed in the valve port 11 of the valve seat 1, and a sealing pair is formed when the valve disc 2 contacts the seal. The number of seals is set according to needs. In this embodiment, three seals are installed on the valve seat 1.

As shown in Figures 2, 3 and 4, the first seal 3 includes a metal seal ring 31 and a U-shaped sealing structure 32. The valve port 11 is provided with an annular groove 12 for installing the first seal 3, and the U-shaped seal structure 32 and the metal sealing ring 31 are installed in the annular groove 12, and the metal sealing ring 31 is located in the inner circumference of the U-shaped sealing structure 32.

The U-shaped sealing structure 32 includes a U-shaped soft sealing element 33 and a tetrafluoroethylene sealing ring 34. The U-shaped soft sealing element 33 has a U-shaped cross section. The tetrafluoroethylene sealing ring 34 is installed in the U-shaped groove of the U-shaped soft sealing element 33. The opening of the U-shaped groove faces downwards.

As shown in Figures 2, 3, 5 and 6, the sealing surface of the metal sealing ring 31 for contact with the valve flap 2 protrudes from the valve port surface; when the valve flap 2 is closed, the valve flap 2 is in sealing contact with the metal sealing ring 31 A hard seal is formed, and at the same time, the valve flap 2 expands the metal sealing ring 31 to squeeze the U-shaped sealing structure 32 to form a soft seal.

The valve port 11 is a tapered port. When the metal sealing ring 31 is sealed with the valve flap 2, a line seal or a surface seal can be used. In this embodiment, the contact surface of the metal sealing ring 31 and the valve flap 2 is a tapered surface.

As shown in Figures 3, 4, and 6, the annular groove 12 has a stepped structure. When the valve flap 2 is not closed, the inner annular surface of the U-shaped sealing structure 32 protrudes from the step surface 13 of the annular groove 12; when the valve flap 2 is closed , The metal sealing ring 31 is forced to expand to abut against the step surface 13 of the annular groove 12. The material of the U-shaped soft seal 33 is rubber, and the material of the PTFE sealing ring 34 is polytetrafluoroethylene.

The second seal 4 has the same structure as the first seal 3. Both the primary and secondary metal sealing rings are higher than the valve seat cone surface, and the valve disc 2 only contacts the metal sealing ring 31; the expandability of the metal sealing ring 31 effectively improves the deformation resistance of the sealing surface, during the pressurizing process , It can compensate the deformation of the valve disc and valve seat under pressure, and avoid pressure leakage.

The third seal 5 is also the last seal. The third seal 5 includes a J-shaped member 51 and a sealing ring 52. The valve port 11 includes a tapered surface 111 and a stepped surface 112. The annular groove 12 is provided on the tapered surface 111. The J-shaped piece 51 and the sealing ring 52 are installed on the step surface 112, the J-shaped piece 51 is located between the sealing ring 52 and the valve seat 1, and the J-shaped piece 51 wraps a part of the sealing ring 52;

When the valve flap 2 is closed, the side of the valve flap 2 forms a soft seal with the sealing ring 52 and the J-shaped member 51, and the bottom surface of the valve flap 2 abuts on the step surface 112 to form an end surface hard seal with the step surface 112. The contact surface between the valve flap 2 and the J-shaped piece 51 is a conical surface.

In this embodiment, the valve seat and the valve clack adopt a multi-stage sealing structure with multi-line/surface sealing contact. When a certain stage of the seal leaks, the other seal pairs still remain sealed, which can effectively prevent the valve from leaking, and its sealing performance is reliable. There is a hard seal structure between the valve seat and the valve disc, which can be used in high temperature and high pressure working conditions.

Example two

Because the flap valve of the traditional core remover is triggered by the shrapnel, and the valve flap's own gravity is used to realize the coordinated action, it can only be drilled in a near-vertical condition.

Therefore, in this embodiment, a magnet is provided on the valve seat 1 and a magnetic material is provided on the valve flap 2. The magnet can choose neodymium iron boron magnet, the valve disc 2 is made of 20CrMnMo carburized steel. The shape, position, and number of magnets are set as required. This embodiment only lists two of them, but it is not limited to these two setting methods.

In the first type, as shown in Fig. 7, a ring magnet 6 is installed on the valve seat 1, and the position of the ring magnet 6 is set as required. The ring magnet 6 can be arranged below the valve seat sealing groove 16 or above the valve seat sealing groove 16.

In the second type, as shown in Fig. 8, a chip magnet 7 is installed on the valve seat 1, and the number and positions of the chip magnets 7 are set as required.

In this embodiment, the valve disc can be magnetically attracted by the valve seat without external force, and the flap valve can be automatically closed even in a horizontal state, realizing the transformation from only vertical drilling to horizontal drilling.

Of course, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes And the deformation should belong to the protection scope of the appended claims of the present invention.

Claims

A pressure-maintaining core remover flap valve with a multi-stage sealing structure, including a valve seat (1) and a valve disc (2). One end of the valve disc (2) is movably connected to the upper end of the valve seat (1), and the top of the valve seat (1) There is a valve port (11) matching the valve disc (2), which is characterized in that: when the valve disc (2) is closed, at least two sealing pairs are formed between the valve seat (1) and the valve disc (2), and the valve seat ( 1) The seal with the valve disc (2) includes hard seal and soft seal.
The pressure-maintaining core remover flap valve according to claim 1, characterized in that: at least two seals are installed in the valve port (11) of the valve seat (1), when the valve disc (2) and the seal When in contact, a sealed pair is formed.
The pressure-maintaining core remover flap valve according to claim 2, characterized in that: the last seal (5) includes a sealing ring (52), and the valve port (11) includes a conical surface (111) and a stepped surface (112);

When the valve flap (2) is closed, the side of the valve flap (2) forms a soft seal with the sealing ring (52), and the bottom surface of the valve flap (2) contacts the step surface (112) to form a hard end surface seal.
The pressure-maintaining core remover flap valve according to claim 3, characterized in that: the last seal (5) also includes a J-shaped piece (51), the J-shaped piece (51) and a sealing ring (52) Installed on the step surface (112), the J-shaped piece (51) is located between the sealing ring (52) and the valve seat (1), and the J-shaped piece (51) wraps a part of the sealing ring (52);

When the disc (2) is closed, the side of the disc (2) forms a soft seal with the sealing ring (52) and the J-shaped piece (51), and the contact surface between the disc (2) and the J-shaped piece (51) is a cone surface.
The pressure-maintaining core remover flap valve according to claim 2, 3 or 4, characterized in that: the first seal (3) includes a metal sealing ring (31), and the valve port (11) is provided with a The annular groove (12) of a seal (3), the metal sealing ring (31) is installed in the annular groove (12), and the sealing surface of the metal sealing ring (31) for contact with the valve disc (2) protrudes Valve port surface; when the valve flap (2) is closed, the valve flap (2) is in sealing contact with the metal sealing ring (31) to form a hard seal.
The pressure-maintaining core remover flap valve according to claim 5, characterized in that: the contact surface between the metal sealing ring (31) and the valve flap (2) is a conical surface.
The pressure-maintaining core remover flap valve according to claim 5, characterized in that: the first seal (3) further comprises a U-shaped sealing structure (32), and the U-shaped sealing structure (32) is mounted on the valve seat ( 1) In the annular groove (12), the metal sealing ring (31) is located at the inner circumference of the U-shaped sealing structure (32);

The U-shaped sealing structure (32) includes a U-shaped soft seal (33) and a PTFE sealing ring (34). The U-shaped soft seal (33) is U-shaped in cross section, and the PTFE sealing ring (34) is installed in the U-shaped In the U-shaped groove of the soft seal (33), the opening of the U-shaped groove faces downward;

When the valve flap (2) is closed, the valve flap (2) expands the metal sealing ring (31) to squeeze the U-shaped sealing structure (32) to form a soft seal.
The pressure-maintaining core remover flap valve according to claim 7, characterized in that the annular groove (12) has a stepped structure, and when the valve flap (2) is not closed, the inner annular surface of the U-shaped sealing structure (32) is convex Step surface (13) from the annular groove (12);

When the valve flap (2) is closed, the metal sealing ring (31) is forced to expand to abut the step surface (13) of the annular groove (12).
The pressure-maintaining core remover flap valve according to claim 7 or 8, wherein the material of the U-shaped soft seal (33) is rubber, and the material of the PTFE sealing ring (34) is polytetrafluoroethylene. Vinyl.
The pressure-maintaining core remover flap valve according to claim 6, 7 or 8, characterized in that the second sealing element (4) has the same structure as the first sealing element (3).