CN214063894U

CN214063894U - Side-mounted floating valve core

Info

Publication number: CN214063894U
Application number: CN202022909613.0U
Authority: CN
Inventors: 万文财; 阿地力萨地尔; 郑廷碧; 郑波强; 金峰; 王文; 张腾飞
Original assignee: Guizhou Gaofeng Petroleum Machinery Co Ltd
Current assignee: Guizhou Gaofeng Petroleum Machinery Co Ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-08-27
Anticipated expiration: 2030-12-07

Abstract

The utility model discloses a side-mounted floating valve core, which comprises a valve body (1) and a valve core assembly (2); a sealing inner conical surface (5) is arranged at the upper part of the inner circle of the valve body, liquid flow channels (6) are arranged at two sides of the valve body below the sealing inner conical surface, a guide seat (7) is arranged at the lower part of the liquid flow channel in the inner hole of the valve body, and the guide seat and the valve body are of an integrated structure; a guide hole (8) is formed in the center of the guide seat, and a side groove (9) is formed in one side, facing the liquid flow channel, of the guide hole; the valve core assembly comprises a valve core (10), the top end of the valve core is provided with a conical cap (11), and the bottom of the conical cap is provided with a valve rod (12); the conical cap and the valve rod are of an integrated structure; the valve rod is sequentially sleeved with a sealing disc (13), an upper spring seat (14), a spring (15) and a lower spring seat (16) from top to bottom, and the lower spring seat is installed in a guide hole of the valve body. The utility model provides the high operational reliability of float valve core to furthest reduces the processing degree of difficulty, the equipment and the dismantlement of being more convenient for.

Description

Side-mounted floating valve core

Technical Field

The utility model relates to a side dress floats case belongs to the interior blowout prevention instrument technical field of oil field equipment drilling.

Background

When the underground pressure is higher than the well killing pressure of the drilling fluid, the drilling accident of well kick and blowout can occur if no blowout prevention equipment or blowout prevention tools exist, when the float valve core is arranged in the drilling tool assembly, the liquid flow upwelling in the pipe can be quickly blocked, and the occurrence of the serious accident of the well kick or the blowout can be effectively prevented. A float valve core key tool is typically used downhole that can be used with a helical stabilizer, a reamer, and a float valve joint having a float valve bore. The floating valve core is a one-way valve when working underground, when the drilling fluid at the wellhead flows downwards, the floating valve core is opened, and the drilling fluid can flow downwards; when high-pressure fluid seeps underground and surges upwards through a water hole of the drilling tool, the reverse flow passage of the floating valve core is closed, so that the upward surge of the liquid flow in the pipe can be quickly blocked to prevent a blowout accident.

In the prior art, a valve stem is usually inserted into a valve seat from the rear end of a valve body and then connected with a valve cap through a pin shaft or a screw. The other is that the front end of the valve rod is connected with the rear end of the bonnet by an annular cylinder in a shaft pin mode, the valve rod is an optical shaft, and the rear end of the bonnet is provided with a through hole which is penetrated oppositely. The other is the screw connection between the front end of the valve rod and the cone at the front end of the valve cap. The two connection structures have the following defects: when the valve rod is connected with the conical cap through the screw, the screw needs to be connected upwards through the three hole pin shafts, the processing technology is difficult, the coaxiality of the holes and the shafts is difficult to ensure, the holes and the shafts are slightly eccentric, and the assembly is difficult or parts are scrapped; the valve rod is connected with a bolt pin shaft between valve caps, the bolt is frequently sheared and the valve rod falls off a conical cap when the valve rod is subjected to well kick, frequent high pressure and vibration in the underground, so that the function of a floating valve core is failed, and the fallen valve rod can block a fluid flow passage of a lower screw drilling tool in serious conditions, so that the serious underground accident of screw power failure is caused. Therefore, the prior art still has the defects and needs to be further improved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a side dress floats case and assembly method, can solve among the current structure that the screw is easy to be cut, cause the valve rod to drop or the problem that the sealing member of valve rod department became invalid to improve the operational reliability who floats the case, and furthest reduces the processing degree of difficulty, the equipment and the dismantlement of being more convenient for, thereby overcome the not enough of prior art existence.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model relates to a side-mounted floating valve core, which comprises a valve body and a valve core assembly; the valve body is cylindrical, a sealing groove is formed in the outer circle of the valve body, and a sealing ring is arranged in the sealing groove; the upper part of the inner circle of the valve body is provided with a sealing inner conical surface, two sides of the valve body below the sealing inner conical surface are provided with liquid flow channels, the liquid flow channels are rectangular through holes radially penetrating through the valve body, the inner hole of the valve body is provided with a guide seat at the lower part of the liquid flow channel, and the guide seat and the valve body are of an integral structure; a guide hole is formed in the center of the guide seat, and a side groove is formed in one side, facing the liquid flow channel, of the guide hole; the valve core assembly comprises a valve core, the top end of the valve core is provided with a conical cap, and the bottom of the conical cap is provided with a valve rod; the conical cap and the valve rod are of an integrated structure; the valve rod is sleeved with a sealing disc, an upper spring seat, a spring and a lower spring seat in sequence from top to bottom, and the lower spring seat is installed in a guide hole of the valve body.

In the side-mounted floating valve core, the outer conical surface of the conical cap is tightly propped against the inner sealing conical surface of the valve body through a spring; the taper of the outer conical surface is the same as that of the inner sealing conical surface of the inner circle of the valve body and the outer conical surface is matched and connected with the inner sealing conical surface of the inner circle of the valve body.

In the side-mounted floating valve core, the axial section of the upper spring seat is T-shaped, an annular boss is arranged at the upper part of the upper spring seat, and a spring limiting boss is arranged at the bottom of the annular boss.

In the side-mounted floating valve core, the axial section of the lower spring seat is in a cross shape; an annular boss is arranged in the middle of the lower spring seat, a spring limiting boss is arranged at the top of the annular boss, and a guide boss is arranged at the bottom of the annular boss; the direction boss is installed in the guiding hole of guide holder.

In the side dress case of floating, the annular boss external diameter on upper spring seat and the lower spring seat all is greater than the spring external diameter, and the spacing boss external diameter of spring slightly is less than the spring internal diameter, and the direction boss excircle of the valve body on the lower spring seat and the guiding hole clearance fit on the valve body.

In the side-mounted floating valve core, the sum of the heights of the spring limiting bosses on the upper spring seat and the lower spring seat is greater than the pressure sum of the springs.

In the side-mounted floating valve core, the opening width of the upper side groove of the guide seat is larger than the outer diameter of the valve rod of the valve core.

In the side-mounted floating valve core, an assembly hole for mounting the valve core assembly is formed in a valve rod of the valve core.

Due to the adoption of the technical scheme, the utility model discloses a valve core adopts overall structure, conical cap and valve rod structure as an organic whole, the technology processing nature and the structural strength of valve core have been improved, the valve rod slope passes through the side channel of valve body, the direction boss that sets up on the lower spring holder of valve core is in the guiding hole of valve body, the external diameter is greater than the side channel that the guiding hole was seted up, therefore the case assembly is under the effect of spring force and the structural constraint, the spring, the upper spring holder, lower spring holder and case are at the axial motion of valve rod, the phenomenon that the screw in former valve rod and conical cap components of a whole that can function independently structure was cut off the valve rod and is come off the case inefficacy has been solved; the valve body is provided with the side groove, so that the problem of difficulty in assembling the valve core is solved, meanwhile, the valve rod gap enters the valve body guide hole through the side groove, and then the guide boss on the valve core enters the guide hole again and cannot be separated from the guide hole. The valve core of the integral structure does not need to be connected by screws, so that the connection part does not have sealing requirements, and the danger of sealing failure caused by shearing of the screws can be avoided. In addition, an annular boss and a guide boss are arranged on a lower spring seat of the guide sleeve, the outer diameter of the annular boss of the lower spring seat is larger than the inner diameter of a guide hole in the guide seat of the valve body, the guide boss is in clearance fit with the guide hole of the valve body, when an upper spring seat is in downward contact with the upper end face of the lower spring seat, the lower end face of a limiting boss of the upper spring seat is in contact with the upper end face of the limiting boss of the lower spring seat, the stroke of the valve core is limited, the stroke of the valve core is smaller than the stroke of the pressure parallel of the spring, the spring is effectively protected, the spring is free of instability and pressure parallel in the whole process, the failure of the spring is avoided, and the service life of the spring is prolonged.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the valve body structure of the present invention;

FIG. 3 is a schematic view of the valve core assembly of the present invention;

fig. 4 is an assembly schematic diagram of the valve cartridge assembly of the present invention.

The labels in the figures are: 1-valve body, 2-valve core assembly, 3-sealing groove, 4-sealing ring, 5-sealing inner conical surface, 6-liquid flow channel, 7-guide seat, 8-guide hole, 9-side groove, 10-valve core, 11-conical cap, 12-valve rod, 13-sealing disc, 14-upper spring seat, 15-spring, 16-lower spring seat, 17-outer conical surface, 18-annular boss, 19-spring limiting boss, 20-guide boss and 21-assembly hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

The utility model relates to a side-mounted floating valve core, which comprises a valve body 1 and a valve core assembly 2; as shown in fig. 2, the valve body 1 is cylindrical, a sealing groove 3 is arranged on the outer circle of the valve body 1, and a sealing ring 4 is arranged in the sealing groove 3; the upper part of the inner circle of the valve body 1 is provided with a sealing inner conical surface 5, two sides of the valve body 1 below the sealing inner conical surface 5 are provided with liquid flow channels 6, the liquid flow channels 6 are rectangular through holes radially penetrating through the valve body 1, the inner hole of the valve body 1 is positioned at the lower part of the liquid flow channels 6 and is provided with a guide seat 7, and the guide seat 7 and the valve body 1 are of an integral structure; a guide hole 8 is formed in the center of the guide seat 7, and a side groove 9 is formed in one side, facing the liquid flow channel 6, of the guide hole 8; as shown in fig. 3, the valve core assembly 2 includes a valve core 10, a conical cap 11 is disposed at the top end of the valve core 10, and a valve rod 12 is disposed at the bottom of the conical cap 11; the cone cap 11 and the valve rod 12 are of an integral structure; the valve rod 12 is sleeved with a sealing disc 13, an upper spring seat 14, a spring 15 and a lower spring seat 16 from top to bottom in sequence, and the lower spring seat 16 is installed in the guide hole 8 of the valve body 1. The outer conical surface 17 of the conical cap 11 is tightly propped against the sealing inner conical surface 5 of the valve body 1 through a spring 15; the external conical surface 17 has the same taper with the internal sealing conical surface 5 of the inner circle of the valve body 1 and is connected in a matching way. The axial section of the upper spring seat 14 is T-shaped, an annular boss 18 is arranged at the upper part of the upper spring seat 14, and a spring limiting boss 19 is arranged at the bottom of the annular boss 18. The axial section of the lower spring seat 16 is cross-shaped; an annular boss 18 is arranged in the middle of the lower spring seat 16, a spring limiting boss 19 is arranged at the top of the annular boss 18, and a guide boss 20 is arranged at the bottom of the annular boss 18; the guide boss 20 is installed in the guide hole 8 of the guide holder 7. The outer diameters of the annular bosses 18 on the upper spring seat 14 and the lower spring seat 16 are larger than the outer diameter of the spring 15, the outer diameter of the spring limiting boss 19 is slightly smaller than the inner diameter of the spring 15, and the excircle of the guide boss 20 of the valve body 1 on the lower spring seat 16 is in clearance fit with the guide hole 8 on the valve body 1. The sum of the heights of the spring limiting bosses 19 on the upper spring seat 14 and the lower spring seat 16 is greater than the pressing height of the spring 15. The opening width of the groove 9 on the upper side of the guide seat 7 is larger than the outer diameter of the valve rod 12 of the valve core 10. The stem 12 of the valve core 10 is provided with a fitting hole 21 for mounting the valve core assembly 2.

The utility model discloses an assembly method who is used for above-mentioned the utility model discloses a side dress floating valve core does, and this method is: during assembly, the valve core assembly 2 is assembled firstly, and then the assembled valve core assembly 2 is integrally installed in the valve core 1, wherein the specific assembly steps are as follows:

step one, as shown in fig. 4, a sealing disc 13, an upper spring seat 14, a spring 15 and a lower spring seat 16 are sequentially sleeved on a valve rod 12 from one end of the valve rod 12;

secondly, holding the annular boss 18 of the lower spring seat 16 by hand to apply force to one end of the conical cap 11 to enable the assembly hole 21 on the valve rod 12 to be exposed out of the end face of the guide boss 20, and then inserting a shaft-shaped assembly tool (not shown in the figure) into the assembly hole 21 to clamp the lower spring seat 16, so as to prevent the spring 15 from rebounding and complete the assembly of the valve core assembly 2;

step three, inserting one end of a conical cap 11 of the assembled valve core assembly 2 into the inner cavity of the valve body 1 from one side of the liquid flow channel 6 with the side groove 9 in an inclined mode, and enabling the conical cap 11 to be in primary contact with a sealing inner conical surface 5 in the inner cavity of the valve body 1;

fourthly, holding the guide boss 20 of the lower spring seat 16 in the valve core assembly 2 by hand, compressing the spring 15 downwards to enable one end of the valve rod 12 to be exposed out of the end face of the guide boss 20, pushing the valve rod 12 into the guide hole 8 from the side groove 9 of the guide seat 7, and then taking out the shaft-shaped assembling tool from the assembling hole 21;

and step five, loosening the guide boss 20 of the lower spring seat 16 in the valve core assembly 2, and enabling the guide boss 20 at the lower end of the lower spring seat 16 to rebound and push into the guide hole 8 under the action of the spring 15 to complete assembly of the side-mounted floating valve core.

The working process and principle of the present invention are further explained below:

when the drilling fluid flows to the outer conical surface 17 of the conical cap 11 at the top end of the valve core assembly 2, the high-pressure fluid pushes the valve core 10 to move downwards, the valve core 10 drives the sealing disc 13 and the upper spring seat 14 to move downwards, the upper spring seat 14 compresses the spring 15, when the lower end surface of the upper spring seat 14 is contacted with the upper end surface of the lower spring seat 16, the valve core 10 stops moving downwards, and at the moment, the drilling fluid can flow downwards through the liquid flow channel 6 on the side surface of the valve body 1. When the pressure of the external conical surface 17 of the valve core 10 is eliminated after the pump is stopped, the spring 15 is reset and extended, the spring 15 pushes the upper spring seat 14, the sealing disc 13 and the valve core 10 to move upwards, the external conical surface 17 of the valve core 10 is tightly contacted with the sealing internal conical surface 5 in the inner circle of the valve body 1, and the float valve is closed. When the drilling tool is normally drilled, when the killing pressure provided by the drilling fluid is smaller than the underground formation pressure, the fluid in the formation and the drilling fluid in the pipe column are pressed by the formation pressure to return upwards, at the moment, the fluid in the pipe column pushes the valve core 10, the upper spring seat 14 and the sealing disc 13 to move upwards, the outer conical surface 17 of the valve core 10 is tightly contacted with the sealing inner conical surface 5 in the inner circle of the valve body 1, the float valve is closed, the ascending channel of the formation pressure in the pipe column is cut off, and the occurrence of a kick or blowout accident is effectively prevented.

The assembling method comprises the following steps: during assembly, the guide boss 20 of the lower spring seat 16 is held by a hand to upwards compress the spring 15 with force, the end face of the guide boss 20 of the lower spring seat 16 is exposed out of the assembly hole 21 on the valve rod 12, and at the moment, a special or proper tool is inserted into the assembly hole 21 of the valve rod 12 to jointly form an assembly body of the valve core assembly 2; the end of a conical cap 11 of an assembly body of the valve core assembly 2 is obliquely inserted into a sealing inner conical surface 5 of the valve body 1 from a liquid flow channel 6 with a guide hole 8 side of the valve body 1, the conical cap 11 is contacted with the sealing inner conical surface 5, a lower spring seat 16 in the valve core assembly 2 is pushed again to compress a spring 15 so that the end surface of a guide boss 20 of the lower spring seat 16 is higher than the upper end surface of a guide seat 7 in the valve body 1, a valve rod 12 of the valve core 10 slides into the guide hole 8 from the side surface of a side groove 9 of the valve body 1, then a shaft-shaped assembly tool is taken out from an assembly hole 21, and the guide boss 20 in the valve core assembly 2 is guided into the guide hole 8 from the inner cavity of the valve body 1 to the top and the bottom, so that the assembly of the side-mounted floating valve core is completed.

The utility model discloses a case adopts a valve rod and an overall structure of awl cap, has cancelled the round pin hub connection of awl cap and valve rod among the prior art, has improved the technology processing nature of case. The valve core with the valve rod and the conical cap in an integral structure does not need to be connected by screws, so that the connection part does not have sealing requirements, and the danger of sealing failure caused by shearing of the screws can be avoided; meanwhile, the structural strength and the safety reliability are improved. In addition, an annular boss and a guide boss are arranged on the lower spring seat, the guide boss is clamped into a guide hole of the valve body, and the valve core assembly is arranged in an inner cavity of the valve body, cannot be separated from the valve body and needs to be taken out by a tool. In addition, when the upper spring seat is in downward contact with the upper end surface of the lower spring seat, the lower end surface of the spring limiting boss of the upper spring seat is in contact with the upper end surface of the spring limiting boss of the lower spring seat to limit the stroke of the valve core, so that the spring is effectively protected, the spring is free from instability and pressure, the failure of the spring is avoided, and the service life of the spring is prolonged.

Claims

1. A side-mounted floating valve core comprises a valve body (1) and a valve core assembly (2); the method is characterized in that: the valve body (1) is cylindrical, a sealing groove (3) is formed in the outer circle of the valve body, and a sealing ring (4) is arranged in the sealing groove (3); the upper part of the inner circle of the valve body (1) is provided with a sealing inner conical surface (5), two sides of the valve body (1) below the sealing inner conical surface (5) are provided with liquid flow channels (6), the liquid flow channels (6) are rectangular through holes radially penetrating through the valve body (1), the inner hole of the valve body (1) is provided with a guide seat (7) at the lower part of the liquid flow channel (6), and the guide seat (7) and the valve body (1) are of an integrated structure; a guide hole (8) is formed in the center of the guide seat (7), and a side groove (9) is formed in one side, facing the liquid flow channel (6), of the guide hole (8); the valve core assembly (2) comprises a valve core (10), a conical cap (11) is arranged at the top end of the valve core (10), and a valve rod (12) is arranged at the bottom of the conical cap (11); the conical cap (11) and the valve rod (12) are of an integrated structure; the valve rod (12) is sequentially sleeved with a sealing disc (13), an upper spring seat (14), a spring (15) and a lower spring seat (16) from top to bottom, and the lower spring seat (16) is installed in a guide hole (8) of the valve body (1).

2. The side mounted float valve cartridge of claim 1, wherein: the outer conical surface (17) of the conical cap (11) is tightly propped against the sealing inner conical surface (5) of the valve body (1) through a spring (15); the external conical surface (17) is in the same taper with the internal sealing conical surface (5) of the inner circle of the valve body (1) and is connected in a matching way.

3. The side mounted float valve cartridge of claim 1, wherein: the axial section of the upper spring seat (14) is T-shaped, an annular boss (18) is arranged at the upper part of the upper spring seat (14), and a spring limiting boss (19) is arranged at the bottom of the annular boss (18).

4. The side mounted float valve cartridge of claim 1, wherein: the axial section of the lower spring seat (16) is cross-shaped; an annular boss (18) is arranged in the middle of the lower spring seat (16), a spring limiting boss (19) is arranged at the top of the annular boss (18), and a guide boss (20) is arranged at the bottom of the annular boss (18); the guide boss (20) is arranged in the guide hole (8) of the guide seat (7).

5. The side mounted float valve cartridge of claim 1, wherein: the outer diameters of annular bosses (18) on the upper spring seat (14) and the lower spring seat (16) are larger than the outer diameter of the spring (15), the outer diameter of a spring limiting boss (19) is slightly smaller than the inner diameter of the spring (15), and the excircle of a guide boss (20) on the lower spring seat (16) is in clearance fit with a guide hole (8) on the valve body (1).

6. The side mounted float valve cartridge of claim 1, wherein: the sum of the heights of the spring limiting bosses (19) on the upper spring seat (14) and the lower spring seat (16) is greater than the pressing height of the spring (15).

7. The side mounted float valve cartridge of claim 1, wherein: the opening width of the upper side groove (9) of the guide seat (7) is larger than the outer diameter of the valve rod (12) of the valve core (10).

8. The side mounted float valve cartridge of claim 1, wherein: and the valve rod (12) of the valve core (10) is provided with an assembly hole (21) for installing the valve core assembly (2).