CN212389309U - Injection well wellhead check valve and valve inner part dismounting hook thereof - Google Patents

Abstract

The utility model relates to an injection well mouth check valve and valve inner part disassembly hook thereof, the well mouth check valve comprises an outer shell, a plug, a valve core and a valve seat, one end of the outer shell is provided with a valve seat baffle table, the plug is arranged at the end part of the other end of the outer shell through a connecting thread, and the outer shell is provided with an outer shell liquid inlet and a liquid discharge joint; the lower body of the plug is provided with a guide rod, the lower body of the valve core is a conical body, a valve core guide hole is formed in the body, and the valve core can slide up and down along the guide rod of the plug under the pushing of injected liquid after being seated in the valve seat. The valve inner part disassembly hook is provided with a hook body, the hook body is two rod bodies, one end of each rod body is connected with the ring body, and the other end of each rod body is provided with a fishing hook bent back. The utility model discloses can solve current well head check valve well and close not tight, prevent the current situation of refluence failure because of reasons such as jam, corruption, improve and pour into the effect into, reduce manufacturing cost, have fine using value.

Description

Injection well wellhead check valve and valve inner part dismounting hook thereof

Technical Field

The utility model relates to an oil field water injection, notes gather, annotate vapour system field, especially an injection well head check valve and valve inner part dismantles the hook, and this check valve can be used for the water injection, annotate the well head that gathers, annotate the vapour well, is a device that can prevent medium refluence in well and the stratum and anti-spitting of medium.

Background

At present, more and more water injection wells, polymer injection wells and steam injection wells are used, and the check valves of the water injection wells, the polymer injection wells and the steam injection wells are more and more commonly applied, so that some defects gradually appear in the practical application process. The existing check valve is easy to be closed untight due to blockage, corrosion and the like, so that the check valve fails, water injection, polymer injection and reverse flow of a steam injection well are further caused, and the stratum is seriously damaged. Some water injection wells, polymer injection wells and steam injection wells cause overhaul operation due to sand back spitting, so that the injection effect is influenced, and the cost is higher.

There is a well head check valve at present, patent application No.: CN201821465620.2, the invention specifically includes valve body, case subassembly and filter equipment, and the case subassembly includes disk seat and case, and the case is located at the disk seat upper end, and filter equipment and case subassembly detachable connection become whole, and this whole detachable assembly is in the valve body, and the case subassembly is conveniently dismantled from the valve body. The valve core assembly is pressed and installed in the valve body through a pressing piece at one end of the valve body, and the pressing piece is detachably connected with the valve body. The valve core is the ball type valve core that is located the disk seat upper end department for the ball type valve core can stably support and realize sealedly on the disk seat in gravity falls back the in-process, and simultaneously for the unlimited upper portion removal of restriction valve ball under the pressure effect, there is the ball cover of keeping off in disk seat upper end releasable connection. The wellhead check valve with the structure can prevent welding slag, impurities, scale and the like from depositing on the ball seat to cause sealing failure, and simultaneously facilitates the cleaning and replacement of the valve ball, the valve seat and the filtering device.

The following drawbacks still exist: the contact part of the ball type valve core and the valve seat is a circular tangent line, and sealing line sealing is formed by the tangent line, and because the contact points are few, a sealing surface cannot be formed, the sealing effect is poor, and the effective function of preventing liquid backflow cannot be achieved; because the contact points are few, when welding slag, scaling or slight corrosion exists, the sealing of the check valve is not tight and fails, and the service life of the check valve is short; after the sealing of the check valve is not tight and fails, the check valve does not have the function of automatic repair; the ball type valve core and the valve seat are made of the same steel, the hardness is the same, and the sealing of the matching surface is poor; the outside of the ball type valve core is only provided with a thin coating, and the coating is damaged quickly under the high-frequency impact of liquid flow and welding slag and the abrasion of the ball type valve core and a valve seat, so that the valve core is easy to corrode; the stop structure is arranged on the inner wall of the valve body, and the stop structure is easy to damage after being corroded and is easy to cause the failure of the check valve; the filtering device is limited by the inner space of the check valve, has small volume, small flow area, large resistance to liquid flow and easy blockage, and has short service life and no filtering effect under the high-frequency impact and corrosion of the liquid flow; the top plug is a common plug, and in the process of overhauling and disassembling, the residual liquid easily hurts people, so that certain potential safety hazard exists.

There is a check valve device at present, patent application No.: CN201821734745.0, the invention includes valve body, case, spring, valve seat and plug. The valve body, the valve core, the spring and the valve seat are used for enabling fluid to pass through the check valve only along a single direction, the valve body comprises a first round pipe and a second round pipe, and one end of the second round pipe is connected to the outer wall of the first round pipe and communicated with the first round pipe. The valve core and the spring are both positioned in the first circular tube, and the spring drives the valve core to axially move along the first circular tube under the action of elasticity; the upper end of the valve seat is detachably connected to the first port of the first circular tube, and the lower end of the valve seat is used for connecting a pipeline; the plug detachably connects in the second port department of first pipe, through dismantling this plug, can conveniently take out this case from this valve body, has avoided when this case damages, dismantles the check valve from the pipeline earlier, dismantles the loaded down with trivial details procedure of case from the check valve again.

The following drawbacks still exist: the device adopts the spring to compress the valve core, the resistance of the spring needs to be overcome when liquid flows, the flow resistance of the liquid is larger, the energy consumption is increased, and meanwhile, the spring is easy to break and damage due to corrosion, fatigue and the like of the liquid, so that the check valve fails; the device depends on a narrow circular ring around the valve core as a flow channel, the flow area and the drift diameter are small, the flow resistance to liquid is large, and the energy consumption is increased; the valve core and the valve seat are in fixed plane sealing, and when the valve core and the valve seat are affected by mechanical impurities such as welding slag, sand grains and the like in liquid, the mechanical impurities such as the welding slag, the sand grains and the like are easily clamped at a sealing surface, so that the valve core and the valve seat are not sealed tightly, and the check valve is invalid.

There is a weighted check valve device at present, patent application No.: CN201821469649.8, the invention comprises a tubular valve body which is vertically arranged and has a through upper end and a through lower end, a valve seat is fixedly arranged in the tubular valve body, and a valve ball is arranged above the valve seat; the valve ball is fixedly connected with a counterweight body which can slide up and down along the axial direction of the tubular valve body. The utility model can overcome the problems that the valve ball of the traditional conventional check valve can rotate and revolve before being closed and can not be closed in time due to the influence of liquid viscosity; the standing valve of the oil well pump can be closed immediately when the standing valve needs to be closed, so that the pump efficiency of the oil well pump is improved.

The following drawbacks still exist: the device adopts a straight-through structure, and after field installation, when the problems of valve core blocking, valve core valve seat corrosion, spring damage and the like occur, the device cannot be disassembled and maintained and can only be used once, so that the service life is short, and the cost is high; the through hole in the center of the valve seat is used as a flow channel, so that the flow area and the drift diameter are small, the flow resistance to liquid is large, and the energy consumption is increased. The sealing surface of the valve core is of a spherical structure, the sealing surface of the valve seat is of a conical cambered surface structure, the valve core and the valve seat are in fixed type matching sealing, the sealing effect is poor, and the valve core and the valve seat are easy to be sealed untight when being influenced by mechanical impurities such as welding slag and sand grains in liquid, so that the check valve fails, and meanwhile, when the sealing surface is damaged when the sealing structure is influenced by liquid corrosion and the mechanical impurities such as the welding slag and the sand grains, the sealing structure cannot be automatically repaired.

Disclosure of Invention

The utility model aims at providing an injection well head check valve and valve inner part dismantles hook, solves current well head check valve and closes not tight, prevent the phenomenon of refluence failure because of reasons such as jam, corruption, and the protection injection well stratum improves and pours into effect, reduction in production cost.

To achieve the above purpose, the technical solution of the present invention is:

a check valve of an injection well wellhead comprises an outer shell, a plug, a valve core and a valve seat, wherein one end of the outer shell is provided with a valve seat baffle table, the plug is installed at the end part of the other end of the outer shell through a connecting thread, and the outer shell is internally provided with an outer shell liquid inlet hole and a liquid discharge connector; the lower body of the plug is provided with a guide rod, the lower body of the valve core is a conical body, a valve core guide hole is formed in the body, and the valve core can slide up and down along the guide rod of the plug under the pushing of injected liquid after being seated in the valve seat.

The upper body of the valve core is a cylinder, the lower body of the valve core is a cone, the lower part of the cone is provided with a liquid guiding flow passage, and a valve core sealing conical surface is arranged between the cone and the cylinder of the valve core.

The liquid guide flow channel is a spiral groove and is provided with at least two.

The inner cavity of the valve seat is a conical sealing cavity which is matched with the valve core sealing surface of the valve core lower body; the lower end face of the valve seat is provided with a valve seat sealing gasket, the outer wall of the valve seat sealing gasket is provided with a valve seat sealing groove, and a valve seat sealing ring is arranged in the valve seat sealing groove.

The depth of a valve core guide hole in the valve core is smaller than the thickness of the valve seat; the inner diameter of the lower end port of the conical sealing cavity in the valve seat is smaller than the aperture of the liquid inlet hole of the outer shell.

The connecting thread is arranged on the outer wall of the middle body of the plug, a wrench is arranged above the middle body of the plug, and the guide rod can be connected below the middle body of the plug through a screw hole or directly arranged below the middle body of the plug; and a liquid discharge position mark is also arranged on one side of the upper end surface of the plug middle body, and a liquid discharge groove is arranged at the lower end of the plug middle body and at a position corresponding to the liquid discharge position mark.

The liquid discharge groove is communicated with the lower end of the plug middle body, and the depth of the liquid discharge groove is set to be between 4mm and 9 mm.

The one end that is equipped with shell body feed liquor hole in the shell body still is equipped with the welding chamfer, and the shell body is equipped with the one end of welding chamfer and can welds with the flow pipeline that comes liquid, and flowing back joint in the shell body can weld with the injection pipeline of injecting the well.

A valve inner part dismantles hook that is used for injection well head check valve, valve inner part dismantles the hook and is equipped with the coupler body, the coupler body is two body of rods, the one end and the ring body of two body of rods meet, the other end of two body of rods is equipped with a crooked fishing hook dorsad respectively.

When the two rod bodies of the hook body are closed together, the width formed by the two fishing hooks bent back to the outside is smaller than the inner diameter of the valve core guide hole, and the total length of the hook body is larger than the total height of the outer shell.

Compared with the prior art, the utility model discloses a show the result of use as follows:

the utility model provides a be equipped with the sealed conical surface of case and spiral helicine drain runner in the case, the sealed conical surface of case can cooperate with the sealed chamber of toper of disk seat. The valve core is driven to rotate when the injected liquid in the liquid flow pipeline is jacked up by the wellhead, impurities in the injected liquid can be taken away along with the liquid flow, and the blockage in the check valve cannot be caused. When the valve core sealing conical surface and the conical sealing cavity of the valve seat are slightly damaged due to the corrosion of liquid and the influence of mechanical impurities such as welding slag, sand grains and the like, the sealing surface between the valve core and the valve seat can be automatically ground under the action of rotating force and friction force, the self-repairing effect is achieved, and the backflow prevention function failure of the check valve due to the fact that the valve core and the valve seat are not sealed tightly can be avoided. Valve seat and shell body pass through the valve seat sealing washer and realize clearance fit, because get into the utility model provides a liquid stream from shell body feed liquor hole entering, from flowing back joint outflow, whole fluid flow channel is the right angle type structure, if the case card is dead, case and disk seat corrode the scheduling problem when appearing, can use the valve inner part to dismantle the hook, take out case and disk seat alone and maintain and change, do not need the whole single current valve that changes. Not only saves the cost, but also improves the maintenance and replacement time rate. The valve seat and the valve core in the check valve are made of two materials with different hardness, for example, the valve seat is made of copper alloy, and the valve core is made of stainless steel, so that the check valve can be better matched, and the self-repairing function is more obvious. The conical sealing surface is adopted between the valve seat and the valve core for sealing, and the sealing effect is better. Because the valve core can move up and down along the guide rod of the plug in the valve seat, and the valve core moves to form larger annular liquid flow, the flow area and the flow path are larger, the flow resistance to liquid is smaller, the energy consumption loss is smaller, and mechanical impurities such as welding slag are not easy to store. When the pressure of the injected liquid is small, the valve core can be pressed by the dead weight of the valve core and the reverse pressure of the liquid in the well. The spring does not install in this check valve, compares with the check valve that is equipped with the spring, and liquid is in the utility model discloses the resistance of spring need not be overcome to well when flowing, only need overcome less case dead weight and can pass through, flow resistance to liquid is less, and one-way effect of damming is better, has better sealing performance. And simultaneously, the utility model discloses set up flowing back groove and flowing back position mark in the body of plug, when the plug was maintained to needs demolish, flowing back position mark can let constructor avoid the flowing liquid that splashes through the flowing back groove of plug well, more humanized.

To sum up, the utility model discloses can solve current well head single current valve well and close not tight, prevent the current situation of refluence failure because of reasons such as jam, corruption, improve and pour into the effect, reduce manufacturing cost, have fine using value.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic cross-sectional view of the present invention.

Fig. 2 is a schematic view of the valve cartridge of the present invention.

Fig. 3 is a schematic sectional view of the valve seat of the present invention.

Fig. 4 is a schematic structural diagram of the middle plug of the present invention.

Fig. 5 is a schematic structural view of the valve inner part detaching hook of the present invention.

Detailed Description

The following detailed description of the present invention, taken in conjunction with the accompanying drawings, is not intended to limit the scope of the invention. It is only following do the preferred embodiment of the utility model, other applications the utility model discloses an equivalent change all should belong to the utility model discloses a protection scope.

Referring to fig. 1 to 5, the wellhead check valve for the injection well comprises an outer shell 1, a plug 3, a valve core 13 and a valve seat 8, wherein one end of the outer shell 1 is provided with a valve seat baffle table 7, so that the valve core 13 and the valve seat 8 can be installed in the outer shell 1, and the plug 3 is installed at the end part of the other end of the outer shell 1 through a connecting thread 2; the outer shell 1 is provided with an outer shell liquid inlet hole 4 and a liquid discharge joint 6, the lower body of the plug 3 is provided with a guide rod 16, the lower body of the valve core 13 is a conical body and is provided with a valve core guide hole 17, and the valve core 13 can slide up and down along the guide rod 16 of the plug 3 under the pushing of injected liquid after being seated in the valve seat 8.

On the basis of the first embodiment, the utility model discloses still have following embodiment:

the upper body of the valve core 13 is a cylinder, the lower body is a cone, the lower part of the cone is provided with a liquid guiding flow passage 15, and a valve core sealing conical surface 14 is arranged between the cone and the cylinder of the valve core 13.

The liquid guide flow passage 15 is a spiral groove and at least two.

The inner cavity of the valve seat 8 is a conical sealing cavity 9, and the conical sealing cavity 9 is matched with a valve core sealing surface 14 of the lower body of the valve core 13; the lower end face of the valve seat 8 is provided with a valve seat sealing gasket 11, the outer wall of the valve seat sealing gasket is provided with a valve seat sealing groove 10, and a valve seat sealing ring 12 is arranged in the valve seat sealing groove 10. The lower body of the valve core 13 is processed into a liquid guide flow channel 15 and then is in a spiral structure, and can rotate under the pushing of liquid flow, so that impurities in the valve seat 8 can be smoothly discharged, and the conical sealing cavity 9 of the valve seat 8 can be ground and self-repaired.

The depth of the valve core guide hole 17 in the valve core 13 is smaller than the thickness of the valve seat 8, so that the valve core 13 cannot leave the valve seat 8 when sliding along the guide rod 16 of the plug 3; the internal diameter of 9 lower extreme ports in toper seal chamber in the disk seat 8 is less than the aperture in shell body feed liquor hole 4, facilitates the use valve inner part and dismantles the hook and hook out disk seat 8.

The connecting thread 2 is arranged on the outer wall of the middle body of the plug 3, a wrench square 18 is processed above the middle body of the plug 3, and the guide rod 16 can be connected below the middle body of the plug 3 through a screw hole or directly processed below the middle body of the plug 3 to be integrally processed with the plug 3; a liquid discharge position mark 20 is arranged on one side of the upper end surface of the middle body of the plug 3, and a liquid discharge groove 19 is arranged at the lower end of the middle body of the plug 3 and at a position corresponding to the liquid discharge position mark 20.

The liquid discharge groove 19 is communicated with the lower end of the middle body of the plug 3, and the depth of the liquid discharge groove 19 is set to be 4-9 mm. A liquid discharge groove 19 is processed in the plug 3, and a liquid discharge position mark 20 is arranged at the position of the upper end surface of the plug 3 corresponding to the liquid discharge groove 19. The drainage position mark 20 can be a groove, a painted line or a welding block processed on the upper end surface of the plug 3 or a screw screwed in by punching, when the check valve is maintained and residual pressure exists in the valve, when the check valve is disassembled, a constructor can pay attention to the position avoiding the drainage position mark 20, and liquid flowing out along the drainage groove 19 in the valve is prevented from splashing to the constructor.

The one end that is equipped with shell body feed liquor hole 4 in the shell body 1 still is equipped with welding chamfer 5, and the one end that shell body 1 was equipped with welding chamfer 5 can weld with the flow pipeline that comes, and drainage joint 6 in the shell body 1 can weld with the injection pipeline of injecting the well.

A valve inner part dismantles hook for injecting well head check valve, be equipped with coupler body 21, coupler body 21 is two body of rods, the one end and the ring body of two body of rods meet, the other end of two body of rods is equipped with a curved fishhook dorsad respectively, because the existence of ring body, the opening and shutting control of two body of rods is free.

When the two rod bodies of the hook body 21 are closed together, the width formed by the two fishing hooks bent back is smaller than the inner diameter of the valve core guide hole 17, and the total length of the hook body 21 is larger than the total height of the outer shell 1. The hook body 21 can be explored into the valve core guide hole 17 to fish the valve core 13 out, and simultaneously can fish the valve seat 8 out, because the inner diameter of the lower end port of the conical sealing cavity 9 in the valve seat 8 is smaller than the aperture of the outer shell liquid inlet hole 4, the fishing hook can fish the valve seat 8 out from the lower end of the fishing hook to the outer shell liquid inlet hole 4.

During the use, will the utility model provides a welding chamfer 5 with come the welding of liquid flow pipeline together, flowing back connects 6 and the injection pipeline welding of injection well together, and the inspection is installed inside shell body 1, is located the top that the disk seat kept off platform 7 inside the shell body, the disk seat 8 that will be equipped with disk seat sealing gasket 11 and disk seat sealing ring 12 with the inside of clearance shell body 1, realizes clearance fit between the inner wall of disk seat 8 and shell body 1.

The valve seat 8 can form movable fit with the valve core 13 under the action of liquid flow thrust and the self weight of the valve core 13. The plug 3 is arranged on the upper part of the outer shell 1, and the guide rod 16 is in clearance fit with the valve core guide hole 17 of the valve core 13 to play a role in guiding and limiting the valve core 13.

After the device is installed, a liquid inlet flow pipeline is opened at a small flow for pressure testing, and after the pressure testing is not leaked, injection pipelines of a water distribution room flow and an injection well are opened, so that the device is put into operation. When a pump station stops pumping or the liquid flow pipeline is perforated or the like, the liquid flow pipeline stops injecting, when the liquid pressure in the well is greater than the liquid pressure, the valve core 13 and the valve seat 8 are effectively sealed under the action of the self weight of the valve core 13 and the liquid pressure in the well, liquid backflow is prevented, liquid in the stratum is prevented from being regurgitated, and damage to the stratum and the shaft due to liquid regurgitation is prevented.

The embodiments described above are merely exemplary embodiments, but the present invention is not limited to these embodiments, and those skilled in the art can make modifications without departing from the spirit and teaching of the present invention. Many variations, combinations, and modifications of the aspects disclosed herein are possible and are within the scope of the invention, which is, therefore, not to be limited by the above description.

Claims (10)

1. The utility model provides an injection well head check valve, which comprises an outer shell body, the plug, case and disk seat, the one end of shell body is equipped with the disk seat and keeps off the platform, the plug passes through connecting thread and installs the tip at the shell body other end, be equipped with shell body feed liquor hole and flowing back joint in the shell body, characterized by, the lower part body of plug is equipped with the guide bar, the lower part body of case is equipped with the case guiding hole in cone and the body, after the case is sat in the disk seat, can be under the promotion of injecting into liquid, slide from top to bottom along the guide bar of plug.

2. The injection well wellhead check valve as claimed in claim 1 wherein the upper body of the valve core is a cylinder and the lower body is a cone, the lower part of the cone is provided with a drainage channel, and a valve core sealing cone is provided between the cone and the cylinder of the valve core.

3. An injection well wellhead check valve as claimed in claim 2 wherein said flow diverting flow path is spiral and is provided in at least two.

4. An injection well wellhead check valve as claimed in claim 2 wherein said internal cavity of said valve seat is a conical seal cavity which mates with a cartridge sealing surface of said cartridge lower body; the lower end face of the valve seat is provided with a valve seat sealing gasket, the outer wall of the valve seat sealing gasket is provided with a valve seat sealing groove, and a valve seat sealing ring is arranged in the valve seat sealing groove.

5. An injection well wellhead check valve as claimed in claim 4 wherein the depth of the spool pilot bore in said spool is less than the thickness of the valve seat; the inner diameter of the lower end port of the conical sealing cavity in the valve seat is smaller than the aperture of the liquid inlet hole of the outer shell.

6. The injection well wellhead check valve as claimed in claim 1 wherein the connecting thread is provided on the outer wall of the plug central body, a wrench is provided above the plug central body, and the guide rod can be connected below the plug central body through the screw hole or directly below the plug central body; and a liquid discharge position mark is also arranged on one side of the upper end surface of the plug middle body, and a liquid discharge groove is arranged at the lower end of the plug middle body and at a position corresponding to the liquid discharge position mark.

7. The injection well wellhead check valve as claimed in claim 6 wherein the drainage channel is open to the lower end of the plug central body and the depth of the drainage channel is set between 4mm and 9 mm.

8. The injection well wellhead check valve of claim 1, wherein the end of the outer housing having the outer housing fluid inlet opening is further provided with a weld chamfer, the end of the outer housing having the weld chamfer is capable of welding with an incoming flow line, and a drain fitting in the outer housing is capable of welding with an injection line of an injection well.

9. A valve inner part disassembly hook for an injection well wellhead check valve as claimed in claim 5 characterised in that the valve inner part disassembly hook is provided with a hook body which is a two rod body with one end connected to the annular ring body and the other end provided with a curved back fishing hook.

10. An in-valve component removal hook as defined in claim 9, wherein the two oppositely curved scoops form a width less than the inner diameter of the spool guide bore when the two bodies of said hook are closed together, and the overall length of said hook is greater than the overall height of the outer housing.

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