Oilfield water injection wellhead check valve

Abstract

The utility model discloses an oil field water injection wellhead check valve, which relates to the technical field of oil field production equipment and comprises a valve body, a valve clack, a valve rod and an operating mechanism, stop valves are arranged at two ends of the valve body, a maintenance cavity is arranged on one side, where liquid flows in, of the valve clack on the valve body, and a flushing loop with a valve is arranged at a liquid inlet end of the valve body and is communicated with the maintenance cavity. And a pressure relief assembly and a residue collection assembly are arranged in the maintenance cavity. In the operation process, the stop valves at the two ends can isolate the system during maintenance or failure, overall shutdown is avoided, the pressure in the cavity is released through the pressure relief assembly, and meanwhile, the maintenance cavity is directionally flushed and residues near the valve clack are removed in combination with the flushing loop. The flushing loop is controlled through a valve at the liquid inlet end, and attached impurities are effectively stripped. The pressure relief assembly and the residue collecting assembly work cooperatively, it is ensured that the pressure in the maintenance cavity is controllable, residues can be directionally collected, and therefore the risk that the valve clack is blocked is reduced, the maintenance period of the valve is prolonged, and the valve is suitable for turbid liquid with many impurities and high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield production equipment technical field. BACKGROUND

[0002] The oilfield check valve is a kind of key equipment in oilfield exploitation process, it can be opened and closed according to fluid pressure difference, ensure that medium unidirectional flow, effectively prevent backflow, guarantee oil well production safety and stability.Its structure is various, has lift type, swing type etc., material is mainly corrosion-resistant, high-pressure alloy steel etc., can adapt to the complex working condition environment of oilfield, such as high temperature, high pressure, sulfur etc.Widely used in Christmas tree, oil pipeline etc., plays an important role for maintaining oilfield production order, preventing equipment damage and environmental pollution.

[0003] The oilfield water injection check valve is the key component of preventing fluid backflow in oilfield water injection system, and its core function is to ensure the unidirectional flow of water injection medium and avoid equipment damage or system efficiency decline caused by backflow.The working principle mainly relies on fluid pressure to drive the valve to open, and when flowing in reverse direction, the valve is closed by fluid pressure and self-weight, and common types include swing type and lift type.The swing type check valve has small fluid resistance due to structural characteristics, and is suitable for large flow scenarios, while the lift type check valve seals through vertical movement of the valve, but has large pressure loss.Oilfield water injection system is usually high pressure and contains impurities, so the material and sealing performance of the check valve are required to be high, and a resilient material (such as stainless steel) valve is needed to avoid brittle fracture, and a corrosion-resistant sealing surface is needed.

[0004] However, in actual production, due to medium problems, there are many impurities and hard particles in the liquid, and the sealing surface is easy to fail due to wear, corrosion or impurity embedding.Meanwhile, the sand or scale in the medium may hinder the movement of the valve. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of oilfield water injection wellhead check valves, it is convenient to maintain and clean, reduce valve body and valve wear.

[0006] The utility model discloses a kind of oilfield water injection wellhead check valves, it is convenient to maintain and clean, reduce valve body and valve wear.

[0007] A kind of oilfield water injection wellhead check valve, including valve body, valve, valve rod and operating mechanism, the valve body both ends are equipped with stop valve, the valve body is equipped with maintenance cavity on the liquid inflow side of valve, the valve body liquid inlet end is equipped with flush circuit with valve, the flush circuit is connected into the maintenance cavity, the maintenance cavity is equipped with pressure relief assembly and residue collection assembly.

[0008] Through the above scheme, by setting the pressure relief assembly and the residue collection assembly, and setting the stop valve, during operation, the two end stop valves can be isolated from the system during maintenance or failure, avoiding overall shutdown; the maintenance cavity is located on the downstream side of the valve disc, facilitating the release of pressure in the cavity through the pressure relief assembly, and at the same time, the maintenance cavity is directionally flushed by the flushing circuit to remove residues near the valve disc. The flushing circuit is controlled by the valve at the liquid inlet end, and the high-pressure water flow directly flushes the contact area of the valve disc and the valve seat, effectively stripping the attached impurities. The pressure relief assembly and the residue collection assembly work together to ensure that the pressure in the maintenance cavity is controllable and the residues can be directionally collected, thereby reducing the risk of valve disc jamming, prolonging the valve maintenance cycle, improving system reliability, and adapting to turbid liquids with more impurities. The device has high practicality.

[0009] Further, the pressure relief assembly includes a pressure relief cover arranged on the side wall of the maintenance cavity, and the position of the pressure relief cover is at the same height as the closed position of the valve disc.

[0010] Through the above scheme, the pressure relief cover is provided, when the maintenance continues, the two side stop valves are closed according to the requirement, the pressure relief cover is opened by a bolt, the pressure in the maintenance cavity is released, and at the same time, the residues and debris in the maintenance cavity are conveniently cleaned, and deposition and adhesion are reduced.

[0011] Further, the opening of the flushing circuit extending into the maintenance cavity is arranged opposite the valve disc.

[0012] Through the above scheme, the design opposite the valve disc makes the high-pressure flushing water flow directly impact the surface and sealing surface of the valve disc, efficiently removing scale or embedded impurities. This directional flushing arrangement can avoid the decline in cleaning effect caused by dispersed water flow.

[0013] Further, the residue collection assembly includes a flow guide net arranged on the side of the valve body liquid inlet end towards the valve disc, the flow guide net is arranged in an inclined manner and the bottom end is inclined to guide into the maintenance cavity, the flow guide net is detachably connected, the lower end of the flow guide net is arranged opposite the pressure relief cover, the flow guide net is in a semi-opened form, and the flow guide net covers 0.25-0.75 of the area of the valve body liquid inlet end.

[0014] Through the above scheme, the inclined design and semi-opened form coverage (covering 25%-75% of the area of the valve body liquid inlet end) of the flow guide net play a diversion role during operation, when part of the impurity-containing medium passes through the flow guide net, larger particles are intercepted and slide into the residue collection groove of the maintenance cavity along the inclined surface, while the remaining medium can still flow normally through the uncovered area, avoiding a significant decrease in flow rate, and avoiding deposition of large-particle residues at the valve disc. The detachable flow guide net facilitates maintenance.

[0015] Further, the flow guide net is made of high-density plastic material, and the flow guide net and the maintenance cavity are fixed by hooks.

[0016] Through the above scheme, the high-density plastic material is used to improve the durability of the flow guide net, and the hooks are used for fixing, which facilitates disassembly, maintenance and cleaning.

[0017] Further, metal shaped keels are distributed on the flow guide net, and the edges of the metal shaped keels are fixed with hooks between the maintenance cavity.

[0018] Through the above scheme, the metal shaped keels are arranged to maintain the shape of the flow guide net, and the impact resistance and the residue interception efficiency of the flow guide net are improved.

[0019] Further, the residue collecting assembly further comprises a residue collecting groove arranged at the lower end of the maintenance cavity, and the lower end of the flow guide net is inclined and extends into the residue collecting groove.

[0020] Through the above scheme, the residue collecting groove is connected with the lower end of the flow guide net to form a residue collecting channel, so that impurities are finally collected in the residue collecting groove, and the residue collecting groove is convenient for regular cleaning.

[0021] Further, the pressure relief assembly further comprises a dismounting groove arranged on the outer end surface of the pressure relief cover, and the diameter of the through hole of the dismounting groove is greater than 1.5 cm.

[0022] Through the above scheme, after the bolts of the pressure relief cover are removed, the pressure relief cover can be quickly dismounted by using a lever and a crowbar, so that the downtime of the device is reduced.

[0023] The beneficial effects of the utility model are as follows:

[0024] 1. The utility model discloses a simple structure, through setting up pressure relief assembly and residue collecting assembly, and setting up stop valve, in the operation process, two end stop valves can isolate the system when maintaining or fault, avoid overall outage, the maintenance cavity is located the downstream side of the valve clack, convenient for releasing the pressure in the cavity through the pressure relief assembly, and the maintenance cavity is directedly washed by combining the flushing circuit, and the residue near the valve clack is removed. The flushing circuit is controlled through the valve of liquid inlet end, and the high-pressure water flow directly washes the contact area of the valve clack and valve seat, effectively peels off the adhered impurities. Pressure relief assembly and residue collecting assembly work cooperatively, ensure that the pressure in the maintenance cavity is controllable and the residue can be directedly collected, thereby reducing the risk of valve clack blockage, prolonging the valve maintenance period, improving system reliability, adapting to more impurities turbid liquid, and the device is practical.

[0025] 2. The inclined design of the flow guide net and the semi-open type covering (covering 25%-75% of the liquid inlet end of the valve body) play a shunting role in operation. When part of the impurity-containing medium passes through the flow guide net, large particles are intercepted and slide into the residue collecting groove of the maintenance cavity along the inclined surface, and the remaining medium can still flow normally through the uncovered area, avoiding a large decrease in flow rate and the deposition of large-particle residues at the valve clack. The detachable flow guide net facilitates cleaning and maintenance. DRAWINGS

[0026] Figure 1 is a sectional structure schematic view of the utility model;

[0027] Figure 2 is a whole structure schematic view of the utility model;

[0028] Reference signs: 11, valve body; 12, valve clack; 13, valve rod; 14, stop valve; 15, maintenance cavity; 16, flushing circuit; 17, pressure relief cover; 18, flow guide net; 19, metal shaped keel; 20, slag collecting groove; 21, dismounting through groove. DETAILED DESCRIPTION

[0029] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0031] Embodiment 1

[0032] As shown in Figure 1 and Figure 2 , the embodiment provides an oilfield water injection well head check valve, which comprises a valve body 11, a valve clack 12, a valve rod 13 and an operating mechanism, both ends of the valve body 11 are provided with stop valves 14, a maintenance cavity 15 is arranged on the valve body 11 on the liquid inflow side of the valve clack 12, a flushing circuit 16 with a valve is arranged at the liquid inlet end of the valve body 11, the flushing circuit 16 is arranged on both sides of the stop valve 14 at the liquid inlet end, the flushing circuit 16 leads into the maintenance cavity 15, and a pressure relief assembly and a residue collection assembly are arranged in the maintenance cavity 15. The pressure relief assembly comprises a pressure relief cover 17 arranged on the side wall of the maintenance cavity 15, the position of the pressure relief cover 17 is at the same height as the closing position of the valve clack 12, the pressure relief cover 17 is fixed with the side wall of the maintenance cavity 15 through bolts and sealing pads, the pressure relief assembly further comprises a dismounting through groove 21 arranged on the outer end face of the pressure relief cover 17, and the diameter of the through hole of the dismounting through groove 21 is greater than 1.5 cm.

[0033] Therefore, by setting the pressure relief assembly and the residue collection assembly, and setting the stop valve 14, during operation, the two end stop valves 14 can isolate the system during maintenance or failure, avoiding overall shutdown; the maintenance cavity 15 is located on the downstream side of the valve disc 12, facilitating the release of pressure in the cavity through the pressure relief assembly, setting the pressure relief cover 17, when continuing maintenance, the two side stop valves 14 are closed according to the needs, the pressure relief cover 17 is opened by bolts, the pressure in the maintenance cavity 15 is released, and at the same time, it is convenient to clean the residue and debris in the maintenance cavity 15, reducing deposition and adhesion, and the through slot 21 is convenient to quickly disassemble the pressure relief cover 17 after the bolts are removed, reducing the downtime of the device, and at the same time, the flushing circuit 16 is combined to direct flush the maintenance cavity 15, removing the residue near the valve disc 12. The flushing circuit 16 is controlled by the valve at the liquid inlet end, and the high-pressure water flow directly flushes the contact area of the valve disc 12 and the valve seat, effectively stripping the attached impurities. The pressure relief assembly and the residue collection assembly work together to ensure that the pressure in the maintenance cavity 15 is controllable and the residue can be collected directionally, thereby reducing the risk of valve disc 12 jamming, prolonging the valve maintenance cycle, improving system reliability, and adapting to turbid liquids with more impurities, and the device has strong practicality.

[0034] With reference to Figure 1 and Figure 2 , the opening of the flushing circuit 16 extending into the maintenance cavity 15 is opposite to the valve disc 12, and the design opposite to the valve disc 12 makes the high-pressure flushing water flow directly impact the surface and sealing surface of the valve disc 12, efficiently removing the scaling or embedded impurities. This directional flushing arrangement can avoid the decline in cleaning effect caused by dispersed water flow.

[0035] With reference to Figure 1 and Figure 2 , the residue collection assembly includes a flow guide net 18 arranged on the liquid inlet end of the valve body 11 towards the valve disc 12 side, the flow guide net 18 is arranged obliquely and the bottom end is obliquely introduced into the maintenance cavity 15, the flow guide net 18 is detachably connected, the lower end of the flow guide net 18 is opposite to the pressure relief cover 17, the flow guide net 18 is semi-open, the area covered by the flow guide net 18 on the liquid inlet end of the valve body 11 is 0.25-0.75, and the oblique design and semi-open coverage (covering 25%-75% of the area of the liquid inlet end of the valve body 11) of the flow guide net 18 play a diversion role during operation, part of the impurity-containing medium is intercepted and slides into the residue collection groove 20 along the inclined surface when passing through the flow guide net 18, and the remaining medium can still flow normally through the uncovered area, avoiding a significant decrease in flow rate, and avoiding deposition of large-particle residue at the valve disc 12. The detachable flow guide net 18 facilitates maintenance.

[0036] With reference to Figure 1The guide net 18 is made of high-density plastic material, and is fixed between the guide net 18 and the maintenance cavity 15 by hooks. The guide net 18 is provided with metal shaped keels 19 distributed thereon, and the metal shaped keels 19 are fixed between the edges of the metal shaped keels 19 and the maintenance cavity 15 by hooks. The residue collecting assembly further comprises a residue collecting groove 20 arranged at the lower end of the maintenance cavity 15, and the lower end of the guide net 18 is inclined to extend into the residue collecting groove 20. The high-density plastic material is used to improve the durability of the guide net 18, and the hooks are used for convenient disassembly, maintenance and cleaning. The metal shaped keels 19 are arranged to maintain the shape of the guide net 18, improve the impact resistance of the guide net 18 and the residue interception efficiency, and the residue collecting groove 20 is connected with the lower end of the guide net 18 to form a residue collecting channel, so that the impurities are finally collected in the residue collecting groove 20, and the residue collecting groove 20 is convenient for periodic cleaning.

[0037] The implementation principle is as follows: by arranging the pressure relief assembly and the residue collecting assembly, and arranging the stop valve 14, the two end stop valves 14 can isolate the system during maintenance or failure, so as to avoid overall shutdown; the maintenance cavity 15 is located on the downstream side of the valve disc 12, so that the pressure in the cavity can be released through the pressure relief assembly, and the maintenance cavity 15 is directionally flushed by the flushing circuit 16 to remove the residues near the valve disc 12. The flushing circuit 16 is controlled by the valve at the liquid inlet end, and the high-pressure water flow directly flushes the contact area between the valve disc 12 and the valve seat, so as to effectively remove the attached impurities. The pressure relief assembly and the residue collecting assembly work cooperatively to ensure that the pressure in the maintenance cavity 15 is controllable and the residues can be directionally collected, so as to reduce the risk of blockage of the valve disc 12, prolong the valve maintenance period, improve the system reliability, adapt to turbid liquid with more impurities, and improve the practicability of the device.

[0038] It should be noted that the connection relationship of the components not mentioned in the present application is defaulted to be the prior art. Since it does not involve the invention point and is generally applied in the prior art, the structure connection relationship is not described in detail.

Claims

1. An oilfield water injection wellhead check valve comprising a valve body (11), a valve disc (12), a valve stem (13) and an operating mechanism, characterised in that, The valve body (11) is provided with a stop valve (14) at both ends, a maintenance cavity (15) is arranged on the valve body (11) on the liquid inflow side of the valve disc (12), a flushing circuit (16) with a valve is arranged at the liquid inlet end of the valve body (11), the flushing circuit (16) is connected to the maintenance cavity (15), and a pressure relief assembly and a residue collection assembly are arranged in the maintenance cavity (15).

2. An oilfield injection wellhead check valve according to claim 1, characterized in that, The pressure relief assembly comprises a pressure relief cover (17) arranged on the side wall of the maintenance cavity (15), the position of the pressure relief cover (17) is at the same height as the closed position of the valve disc (12), and the pressure relief cover (17) is fixed to the side wall of the maintenance cavity (15) by bolts and sealing pads.

3. An oilfield water injection wellhead check valve according to claim 2, characterized in that, The opening of the flushing circuit (16) extending into the maintenance cavity (15) is arranged opposite the valve disc (12).

4. An oilfield injection wellhead check valve according to claim 2, wherein, The residue collection assembly comprises a flow guide net (18) arranged on the liquid inlet end of the valve body (11) towards the side of the valve disc (12), the flow guide net (18) is arranged in an inclined manner and the bottom end is inclined to guide into the maintenance cavity (15), the flow guide net (18) is detachably connected, the lower end of the flow guide net (18) is arranged opposite the pressure relief cover (17), the flow guide net (18) is in a semi-open form, and the area of the flow guide net (18) covering the liquid inlet end of the valve body (11) is 0.25-0.

75.

5. An oilfield injection wellhead check valve according to claim 4, wherein, The flow guide net (18) is made of high-density plastic material, and the flow guide net (18) and the maintenance cavity (15) are fixed by hooks.

6. An oilfield injection wellhead check valve according to claim 5, characterized in that, Metal shaped keels (19) are arranged on the flow guide net (18), and the edges of the metal shaped keels (19) and the maintenance cavity (15) are fixed by hooks.

7. An oilfield water injection wellhead check valve according to claim 6, characterized in that, The residue collection assembly further comprises a residue collection groove (20) arranged at the lower end of the maintenance cavity (15), and the lower end of the flow guide net (18) is inclined to extend into the residue collection groove (20).

8. An oilfield injection wellhead check valve according to claim 2, wherein, The pressure relief assembly further comprises a disassembly through groove (21) arranged on the outer end face of the pressure relief cover (17), and the diameter of the through hole of the disassembly through groove (21) is greater than 1.5 cm.

Images