CN108798591A - A kind of arrow-shaped check valve - Google Patents

Abstract

The invention discloses an arrow-shaped check valve, which includes an upper valve body and a lower valve body, through holes are arranged on the upper and lower valve bodies, a fixed seat is arranged in the lower valve body, and a valve core is arranged on the fixed seat. In that: the lower end of the spool is connected to the fixed seat through an axial sliding mechanism, a flow hole structure is arranged at the upper end of the spool, and a sealing mechanism is arranged below the flow hole structure, the valve The upper end of the core is arranged with the sealing hole provided in the upper valve body, the sealing mechanism is arranged in a sealed manner with the sealing hole, and a liquid flow channel structure is arranged on the fixed seat. The invention has the advantages of compact structure, convenient installation and disassembly, and long service life. The upper end of the valve core is provided with a flow hole structure, and the inner cavity of the check valve is increased without increasing the external size of the arrow-shaped check valve. The flow area of liquid reduces energy loss and improves work efficiency.

Description

An Arrow Check Valve

technical field

The invention relates to a novel arrow-shaped check valve, which is mainly used in the field of blowout prevention tools and equipment in oil and gas exploitation, and belongs to petroleum drilling machinery and equipment.

Background technique

The arrow-shaped check valve is one of the commonly used anti-blowout tools in the drilling tool, which is installed on the drill string. Once a well kick or blowout occurs in the drilling operation, under the action of the high-pressure oil and gas layer or the pressure of the reverse circulation drilling fluid, the arrow-shaped valve core moves up quickly to fit and seal with the valve seat, blocking the drilling tool channel in time to prevent continuous well kick and blowout. Blowout. The disadvantages of arrow check valves in the prior art are:

The existing arrow-shaped check valve has many consumable parts and is difficult to install, which also affects the service life of the arrow-shaped check valve.

The presence of the pressure cap for fixing the valve seat and the arrow seat of the arrow-shaped valve core greatly reduces the flow area of the drilling fluid in the inner cavity of the check valve. This hinders the circulation of drilling fluid, increases the pressure loss and energy loss of drilling fluid, and affects the drilling rate.

During drilling operations, the pressure value of the drilling fluid is in a meso-stable state, and the spring of the arrow-shaped valve core will always be in working state. This affects the life of the spring, which is not conducive to drilling operations, and affects the service life of the arrow check valve.

Contents of the invention

The technical problem to be solved by the present invention is to provide an arrow-shaped check valve with simple structure, convenient assembly and disassembly, which can increase the flow area of the valve cavity, reduce the energy loss of drilling fluid and improve the working efficiency.

The technical solution adopted in the present invention is: an arrow-shaped check valve, including an upper valve body and a lower valve body, through holes are arranged on the upper and lower valve bodies, a fixed seat is arranged in the lower valve body, and a fixed seat is arranged on the fixed seat. The valve core is characterized in that: the lower end of the valve core and the fixed seat are axially slidably connected through an axial sliding mechanism, a flow hole structure is provided at the upper end of the valve core, and a seal is provided below the flow hole structure. mechanism, the upper end of the valve core is arranged with the sealing hole provided in the upper valve body, the sealing mechanism is arranged in a sealed manner with the sealing hole, and a liquid flow channel structure is arranged on the fixed seat.

According to the above technical solution, the upper end of the spool has a truncated conical structure, and the lower end is a cylindrical shape with reduced diameter, forming an arrow-shaped spool. The sealing hole is also in the shape of a truncated cone. When sealing, the conical surface of the arrow-shaped spool and the The conical surface of the sealing hole is sealed to form the first sealing surface, and the sealing mechanism and the side wall of the sealing hole are sealed to form the second sealing surface, thus forming a double sealing structure.

According to the above technical solution, the flow hole structure is a funnel-shaped structure, including a central hole communicating with the through hole of the upper valve body and a number of bypass holes communicating with the central hole, and the bypass holes extend to the side wall of the upper end of the valve core .

According to the above technical solution, the bypass holes are evenly arranged along the circumference of the valve core.

According to the above technical solution, the fixed seat includes a fixed seat body, the upper end of the fixed seat body is exposed to a certain height relative to the installation hole of the lower valve body, and the liquid flow channel structure includes an end surface arranged on the upper end surface of the fixed seat body The communication hole, the side radial hole provided on the upper part of the fixing seat body and the axial channel provided on the fixing seat body, the end face communication hole and the side radial hole are both connected to the axial channel.

According to the above technical solution, the end face communication holes are U-shaped communication holes, and at least two U-shaped communication holes are provided on the upper end surface of the fixing base body.

According to the above technical solution, the axial sliding mechanism includes an axial chute arranged on the central hole wall of the fixed seat and a radial fixed pin arranged at the lower end of the valve core, and the radial fixed pin slides with the axial chute. The shifting configuration is provided with a limit device on the fixed seat to limit the sliding length of the fixed pin.

The beneficial effects obtained by the present invention are:

1. The present invention has the advantages of compact structure, convenient installation and disassembly, and long service life. The upper end of the valve core is provided with a flow hole structure, and the inner cavity of the check valve is increased without increasing the external size of the arrow-shaped check valve. The circulation area of drilling fluid inside reduces energy loss and improves work efficiency.

2. The truncated cone on the upper part of the valve core and the sealing mechanism are double-bonded with the truncated cone in the inner cavity of the upper valve to form a double sealing mechanism, which further improves the sealing effect.

3. The combined structure of the valve core fixing pin and the axial chute of the fixing seat can also make the valve core form a stable axial movement in the inner cavity without the spring device, thereby reducing consumable devices such as springs. Extends the service life of arrow check valves.

Description of drawings

Fig. 1 is a full sectional structural view of an arrow-shaped check valve of the present invention.

Fig. 2 is a structural view of an arrow-shaped valve core in the present invention.

Fig. 3 is a sectional view of the fixing seat in the present invention.

Fig. 4 is a top view of the fixing seat in the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in the figure, this embodiment provides an arrow-shaped check valve, which includes an upper valve body 1 and a lower valve body 4. Through holes are provided on the upper and lower valve bodies, and a cone-cylindrical surface is provided at the lower end of the upper valve body 1. The upper end of the lower valve body is provided with an inverted cone inner hole matched with the cone cylinder surface, and the two are connected by threads. A fixed seat 3 is arranged in the lower valve body 4, and a valve core 2 is arranged on the fixed seat 3. The lower end of the valve core 2 and the fixed seat are axially slidingly connected through an axial sliding mechanism. The upper end of the upper end is provided with a flow hole structure, and a sealing mechanism is arranged under the flow hole structure. The upper end of the valve core is arranged with the sealing hole provided in the upper valve body. 3 is provided with a liquid flow channel structure.

In this embodiment, the purpose of the liquid flow channel structure in the fixed seat and the flow hole structure 5 in the valve core is to increase the drilling fluid flow area up and down the valve cavity, reduce resistance, and improve drilling efficiency.

The upper end of the spool 2 is a truncated conical structure, and the lower end is cylindrical in diameter, forming an arrow-shaped spool. The sealing hole is also in the shape of a truncated cone. When sealing, the conical surface of the arrow-shaped spool 2 and the sealing hole The cone seal forms the first sealing surface, and the sealing mechanism and the side wall of the sealing hole are sealed and configured to form the second sealing surface, thus forming a double sealing structure. The flow hole structure 5 is a funnel-shaped structure, including a central hole 501 communicating with the through hole of the upper valve body and a number of bypass holes 502 communicating with the central hole. The bypass holes 501 are evenly arranged along the circumference of the valve core. The bypass hole 502 extends to the upper side wall of the valve core. Wherein the sealing mechanism may be a sealing ring arranged on the side wall of the upper end of the pointed valve core.

The fixed seat 3 includes a fixed seat body, the upper end of the fixed seat body exposes a certain height relative to the installation hole of the lower valve body, and the liquid flow channel structure includes an end face communicating hole 7, The side radial hole 8 provided on the upper part of the fixing seat body and the axial channel provided on the fixing seat body, the end surface communicating hole 7 and the side radial hole 8 are both connected to the axial channel. Wherein, the end surface communication hole 7 is a U-shaped communication hole, and at least two U-shaped communication holes are provided on the upper end surface of the fixing seat body. In this embodiment, two U-shaped communication holes and four side radial holes 8 Take this as an example.

The axial sliding mechanism includes an axial chute 9 provided on the central hole wall of the fixed seat and a radial fixed pin 11 provided at the lower end of the valve core, and the radial fixed pin 11 slides with the axial chute 9 Configuration, on the fixed seat is provided with a limit device that limits the sliding length of the fixed pin 11. Wherein, the limit device can be a limit block installed on the fixed upper end or the length of the axial sliding groove can be limited to a certain length. The combined structure of the spool fixing pin and the axial chute of the fixed seat can also make the spool move stably in the inner cavity without the spring device, thereby reducing consumable devices such as springs and extending the arrow. The service life of check valve.

During normal drilling operations, under the high pressure of the drilling fluid, the spool moves downward along the fixed pin 11 to the bottom of the axial chute, and the check valve opens. Drilling fluid can flow through the valve through the funnel structure of the valve core, the valve cavity and the six flow channels of the fixed seat. When a blowout or well kick is found, under the action of the reverse circulation high-pressure fluid, the valve core moves downward along the fixed pin 11 axis, when the cone surface of the arrow rest 10 of the valve core and the sealing mechanism 6 are sealed with the conical seal in the upper valve body When the holes fit snugly, the check valve closes, preventing reverse circulation high pressure fluid from flowing upward. When the valve is opened, the funnel structure of the valve core in the valve cavity and the flow channel structure of the fixed seat can effectively reduce the energy loss of drilling fluid; At the same time, it fits with the cone and cylinder in the upper valve body to form a double-layer seal, which improves the sealing performance of the valve.

The arrow-shaped check valve of this embodiment has only four parts and one wearing part (sealing mechanism) as a whole, which reduces the number of parts that are not suitable for installation and are easy to wear. The arrow-shaped check valve in this embodiment is more convenient to install and disassemble, and the overall service life is prolonged.

Claims (7)

1. a kind of arrow-shaped check valve, including upper valve body and lower valve body, it is designed with through-hole in upper lower valve body, is equipped in lower valve body solid Reservation is configured with spool in fixed seat, it is characterised in that：The lower end of the spool passes through axial slipping mechanism axis with fixed seat It is connected to sliding, circulation pore structure is equipped in the upper end of the spool, sealing mechanism is equipped in the lower section of circulation pore structure, it is described The upper end of spool and the sealing hole phase configuration being arranged in upper valve body, the sealing mechanism and sealing hole seal arrangement, in fixation Seat is equipped with liquid flowing channel structure.

2. arrow-shaped check valve according to claim 1, it is characterised in that：The upper end of the spool is in circular cone structure, under End is that undergauge is cylindric, constitutes flechette-type spool, and the sealing hole is similarly circular cone shape, when sealing, the conical surface of flechette-type spool with The conical surface seal of sealing hole, forms first of sealing surface, and it is close to form second for the side wall seal arrangement of sealing mechanism and sealing hole Cover, to constitute double sealing structure.

3. arrow-shaped check valve according to claim 1 or 2, it is characterised in that：The circulation pore structure is funnel-shaped structure, Include that the centre bore being connected to upper valve body through-hole and several by-pass prots being connected with centre bore, the by-pass prot extend to spool Upper end side wall.

4. arrow-shaped check valve according to claim 3, it is characterised in that：The by-pass prot is arranged circumferentially along spool.

5. arrow-shaped check valve according to claim 1 or 2, it is characterised in that：The fixed seat includes fixed seat ontology, institute The upper end for stating fixed seat ontology exposes certain height with respect to the mounting hole of lower valve body, and the liquid flowing channel structure is included in fixation Seat ontology upper surface setting end face intercommunicating pore, fixed seat body upper part setting side radial hole and in fixed seat sheet The axial passage being arranged on body, the end face intercommunicating pore are connected with axial passage with side radial hole.

6. arrow-shaped check valve according to claim 5, it is characterised in that：The end face intercommunicating pore is U-shaped intercommunicating pore, solid The upper surface of reservation ontology is equipped at least two U-shaped intercommunicating pores.

7. arrow-shaped check valve according to claim 1 or 2, it is characterised in that：The axial direction slipping mechanism is included in fixation The axial slide being arranged and the radially fixed pin being arranged in spool lower end on the hole wall of seat center, the radially fixed pin are slided with axial Slot sliding configuration, is equipped with the limiting device of limitation fixed pin slip length in fixed seat.