Backflow controllable check valve for oil well and oil jacket communicated wellhead

Abstract

The check valve comprises a valve body, a first connecting port is formed in the upper end of the valve body, a second connecting port is formed in the side wall of the valve body, a valve element assembly and a valve seat are arranged at the position, between the first connecting port and the second connecting port, of the inner wall of the valve body, and the valve seat is close to the second connecting port. A valve element jacking assembly is arranged at the lower end of the valve body and used for jacking the valve element, so that fluid passing through the first connector flushes the valve element assembly and the valve seat. The check valve solves the production problem that leakage of a valve element and a valve seat of a traditional check valve is difficult to process due to particle impurities such as sand and wax in oil well liquid. According to the utility model, the sealing emptying operation during the maintenance of an oil well pipeline can be realized in a low casing pressure well, the waste liquid treatment cost is reduced, and the labor intensity of workers is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas exploitation technical field, concretely is a kind of backflow controllable check valve and oil sleeve intercommunication wellhead for oil well. BACKGROUND

[0002] In order to control casing pressure and reduce the influence of gas on oil pump in oilfield production, oil sleeve intercommunication device is generally installed in production process. The check valve used in oil sleeve intercommunication mainly includes right-angle type and spring type check valve, and the sealing mechanism of valve core and valve seat is mainly spherical surface and conical surface cooperation sealing. Due to the well condition, the casing pressure of each well is different, and the casing pressure of the same well changes greatly in different periods. The check valve of oil sleeve intercommunication is in different cycle opening and closing state. When the casing pressure is lower than the back pressure, the check valve is closed, and the impurities such as sand and wax in well fluid are easily accumulated between valve core and valve seat, causing the valve to be not tightly closed. To solve this problem, it is necessary to disassemble the process and deal with it, which is time-consuming and laborious, and affects the work efficiency.

[0003] Publication No. CN219034675U discloses a constant pressure oil sleeve intercommunication wellhead, which comprises an oil production tree, a casing pressure channel, a tee valve, a constant pressure automatic gas release valve, a flat valve, an oil pressure process, an oil pressure channel and a locking structure.

[0004] When the sealing is not tight, the existing technology needs to disassemble the wellhead for overhaul, which is low in efficiency and affects production.

[0005] Publication No. CN221922127U discloses a small-sized plug-in type hydraulic control check valve, which comprises a valve body, a control piston arranged in the front valve body, a piston spring, a main valve body, a rear valve body, a ball valve, a valve core spring and a sealing element.

[0006] The existing technology is different from the technical problem to be solved by the present patent, and the existing technology does not disclose the valve core lifting assembly lifting the valve core, so that the fluid passing through the connecting port one flushes the valve core assembly and valve seat.

[0007] The utility model discloses a right angle check valve with pressure relief function, including the valve body, be equipped with the inner chamber in the valve body, and be equipped with main valve port in the inner chamber, and the inner chamber includes the liquid outlet chamber and the liquid inlet chamber, and the liquid outlet chamber and the liquid inlet chamber are equipped with liquid outlet and liquid inlet respectively, and the valve body is equipped with the valve cover, and the valve cover is screwed with the spout, and the spout is screwed with the limit tube in, and the spout is equipped with the pressure relief ball and pressure relief spring, and the pressure relief ball top leans the pressure relief valve port of being equipped with the closure, and the liquid outlet chamber is equipped with the pressure spring and the sliding plug, and the pressure spring leans between the sliding plug and the valve cover, and the sliding plug is equipped with the center groove, and is equipped with the liquid flow hole and the column in the center groove respectively, and the column is used for inserting the end of spout and top pressure relief ball, with the function of one-way control and safe pressure relief.

[0008] The prior art is different from the technical problems solved by the present patent, and the prior art does not disclose that the valve core is lifted by the valve core lifting assembly, so that the fluid passing through the connecting port one flushes the valve core assembly and the valve seat. Practical new type content

[0009] In view of the above defects existing in the prior art, the purpose of the present application is to provide a backflow controllable single-flow valve for oil well and oil sleeve communication wellhead.

[0010] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0011] On the one hand, the present application provides a backflow controllable single-flow valve for oil well, which comprises a valve body, a connecting port one is arranged at the upper end of the valve body, a connecting port two is arranged on the side wall of the valve body, a valve core assembly and a valve seat are arranged on the inner wall of the valve body between the connecting port one and the connecting port two, the valve seat is close to the connecting port two, a valve core lifting assembly is arranged at the lower end of the valve body, which is used to lift the valve core, so that the fluid passing through the connecting port one flushes the valve core assembly and the valve seat.

[0012] Further, the valve core assembly comprises a valve core, a spring and a spring seat;

[0013] Specifically, the outer wall of the spring seat is connected with the inner wall of the valve body, the outer wall of the valve seat is connected with the inner wall of the valve body, the valve seat is provided with a valve hole, and the spring seat is provided with an axial flow hole;

[0014] Specifically, the spring is sleeved on the valve core, the spring presses the spring seat on the upper part and the valve core on the lower part, and the valve core is pressed on the valve hole of the valve seat.

[0015] Further, the valve core comprises a valve ball and a valve rod, the valve ball and the valve rod are connected, the spring is sleeved on the valve rod, and the spring presses the valve ball on the valve hole of the valve seat.

[0016] Further, the spring seat is a hub structure, and the valve rod slides through the spring seat.

[0017] Further, the valve seat is provided with a conical valve hole or an arc-shaped valve hole.

[0018] Further, the valve core lifting assembly comprises a lifting rod, a plug, and a connecting seat;

[0019] Specifically, the connecting seat outer wall is connected with the valve body lower end inner wall, a threaded hole is arranged in the center of the connecting seat, the lifting rod is threadedly connected with the threaded hole and can be rotated up and down, and the end of the lifting rod outside the valve body is connected with the plug.

[0020] In a second aspect, the utility model provides a kind of oil jacket intercommunication well mouth, including oil pipe, casing, the oil pipe is arranged in casing, the oil pipe, casing upper end connects well mouth, the well mouth is arranged with the oil pipe line of oil pipe intercommunication, the well mouth is arranged with the casing line of annular intercommunication between oil pipe, casing, further comprising the backflow controllable check valve of one aspect described in the application;The casing line is communicated with the oil pipe line by backflow controllable check valve, and oil gas in casing line is unidirectionally flowed to oil pipe line.

[0021] Further, the casing line is connected with the connecting port two of backflow controllable check valve;

[0022] Specifically, it further includes a tee, the tee is provided with a one-way port, a two-way port and a three-way port, the oil pipe line is connected with the one-way port of the tee, the two-way port of the tee is connected with the connecting port one of backflow controllable check valve, and the three-way port of the tee is connected with the flow line.

[0023] Further, the oil pipe line is provided with an oil pipe valve, the casing line is provided with a casing valve, and the flow line is provided with a flow valve.

[0024] Further, the casing line is provided with a nipple sleeve between the casing valve and backflow controllable check valve.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] 1. The utility model solves the production problem that the valve core and valve seat of traditional check valve are difficult to handle when leakage occurs due to particles such as sand and wax in oil well liquid.

[0027] 2. The utility model can also realize sealing and emptying operation when oil well pipeline is repaired in low casing pressure well, reduce waste liquid treatment cost and reduce labor intensity of workers. DRAWINGS

[0028] Figure 1 It is a structure schematic view of backflow controllable check valve for oil well in the utility model;

[0029] Figure 2 It is a structure schematic view of oil jacket intercommunication well mouth in the utility model;

[0030] Figure: 1, wellhead; 2, oil pipe; 3, casing; 4, oil pipe valve; 5, casing valve; 6, oil nozzle sleeve;

[0031] 7, backflow controllable check valve; 7.1, valve body; 7.2, connecting port one; 7.3, connecting port two; 7.4, top rod; 7.5, plug; 7.6, connecting seat; 7.7, valve seat; 7.8, valve ball; 7.9, valve rod; 7.10, spring; 7.11, spring seat;

[0032] 8, flow valve. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0034] Embodiment 1:

[0035] Please refer to Figure 1 The backflow controllable check valve for oil well provided in the embodiment comprises a valve body 7.1, a connecting port one 7.2 is arranged at the upper end of the valve body 7.1, a connecting port two 7.3 is arranged on the side wall of the valve body 7.1, a valve core assembly is arranged on the inner wall of the valve body 7.1 between the connecting port one 7.2 and the connecting port two 7.3, and a valve seat 7.7 is arranged, the valve seat 7.7 is close to the connecting port two 7.3, a valve core lifting assembly is arranged at the lower end of the valve body 7.1, and the valve core lifting assembly is used for lifting the valve core to flush the valve core assembly and the valve seat 7.7 through the connecting port one 7.2.

[0036] Further, the valve core assembly comprises a valve core, a spring 7.10 and a spring seat 7.11, the outer wall of the spring seat 7.11 is threadedly connected with the inner wall of the valve body 7.1, the outer wall of the valve seat 7.7 is threadedly connected with the inner wall of the valve body 7.1, the valve seat 7.7 is provided with a valve hole, the spring seat 7.11 is provided with an axial flow hole, the spring 7.10 is sleeved on the valve core, the spring 7.10 presses the spring seat 7.11 upward and the valve core downward, and the valve core is pressed on the valve hole of the valve seat 7.7.

[0037] Specifically, the valve core comprises a valve ball 7.8 and a valve rod 7.9, the valve ball 7.8 and the valve rod 7.9 are integrally connected, the spring 7.10 is sleeved on the valve rod 7.9, and the spring 7.10 presses the valve ball 7.8 on the valve hole of the valve seat 7.7.

[0038] Specifically, the spring seat 7.11 is a hub structure, and the valve rod 7.9 slides through the spring seat 7.11 to realize limiting and guiding.

[0039] Specifically, the valve seat 7.7 sets a conical valve hole or an arc-shaped valve hole.

[0040] Further, the valve core lifting assembly includes a lifting rod 7.4, a plug 7.5, and a connecting seat 7.6, the outer wall of the connecting seat 7.6 is threadedly connected with the inner wall of the lower end of the valve body 7.1, the center of the connecting seat 7.6 is provided with a threaded hole, the lifting rod 7.4 is threadedly connected with the threaded hole and can be rotated up and down, and the end of the lifting rod 7.4 outside the valve body 7.1 is welded to connect the plug 7.5, so as to rotate the lifting rod 7.4 in and out.

[0041] By rotating the plug 7.5, the lifting rod 7.4 lifts the valve ball 7.8, so that the oil and gas passing through the connecting port one 7.2 flushes the valve ball 7.8 and the valve seat 7.7.

[0042] Specifically, in the embodiment, the parts are sealed by thread sealing or embedded sealing rings.

[0043] Embodiment 2:

[0044] In combination Figure 2 On the basis of embodiment 1, the embodiment provides an oil-casing communication wellhead, which includes a tubing 2 and a casing 3, the tubing 2 is arranged in the casing 3, the upper ends of the tubing 2 and the casing 3 are connected with a wellhead 1, the wellhead 1 is provided with a tubing line in communication with the tubing 2, the wellhead 1 is provided with a casing line in communication with the annulus between the tubing 2 and the casing 3, and the casing line is communicated with the tubing line through the backflow controllable check valve 7 in embodiment 1, so that the oil and gas in the casing line flows to the tubing line in one direction.

[0045] Specifically, the casing line is connected with the connecting port two 7.3 of the backflow controllable check valve 7, the tubing line is connected with one port of a tee, the other port of the tee is connected with the connecting port one 7.2 of the backflow controllable check valve 7, and the third port of the tee is connected with a flow line.

[0046] Specifically, the tubing line is provided with a tubing valve 4, the casing line is provided with a casing valve 5, and the flow line is provided with a flow valve 8.

[0047] Further, the casing line is provided with a choke nipple 6 between the casing valve 5 and the backflow controllable check valve 7, after the backflow controllable check valve 7 is opened under the pressure of the casing 3, the choke nipple 6 increases the outlet pressure of the casing line, so that the pressure of the casing 3 can be stably released, and the choke nipple 6 itself is a prior art which is clear to those skilled in the art.

[0048] When in use, the controllable one-way valve pass 7 is connected to the wellhead oil casing through the pipeline valve, when the casing pressure is higher, the medium in the casing 3 passes through the casing valve 1, the oil nozzle casing 2, the controllable one-way valve pass 7 and the tee joint into the flow pipeline; when the casing pressure is lower, the controllable one-way valve pass 7 is closed, when the medium flows back, the plug 7.5 is rotated, the valve ball 7.8 in the jack rod 7.4 is pushed open, the well fluid backflow washes away the impurities, the purpose of disassembly-free leak stopping is achieved, when the wellhead construction needs to be vented, the plug 7.5 is also rotated to push open the valve ball 7.8, the ground pipeline liquid is returned to the casing to reduce the waste liquid treatment cost.

[0049] In the present application, the parts not discussed in detail, the connection mode of the parts in the present application all belong to the known technology in the technical field. Direct application can be used without further description.

[0050] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense. For example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connecting" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the device or unit indicated or implied to have a specific direction, to be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the present application.

[0052] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A controllable backflow single valve for oil well, comprising a valve body, a connecting port one is arranged on the upper end of the valve body, a connecting port two is arranged on the side wall of the valve body, a valve core assembly and a valve seat are arranged on the inner wall of the valve body between the connecting port one and the connecting port two, and the valve seat is close to the connecting port two, characterized in that, The valve body lower end is provided with a valve core lifting assembly for lifting the valve core to flush the valve core assembly and the valve seat by fluid passing through the connecting port one.

2. A backflow controllable one-way valve for use in oil wells according to claim 1, characterized in that The valve core assembly comprises a valve core, a spring and a spring seat. The spring seat outer wall is connected with the valve body inner wall, the valve seat outer wall is connected with the valve body inner wall, the valve seat is provided with a valve hole, and the spring seat is provided with an axial flow hole. The spring is sleeved on the valve core, the spring presses the spring seat upward and the valve core downward, and the valve core is pressed on the valve hole of the valve seat.

3. A backflow controllable one-way valve for use in oil wells according to claim 2, characterized in that The valve core comprises a valve ball and a valve rod, the valve ball is connected with the valve rod, the spring is sleeved on the valve rod, and the spring presses the valve ball on the valve hole of the valve seat.

4. A backflow controllable one-way valve for use in oil wells according to claim 3, characterized in that The spring seat is a hub structure, and the valve rod slides through the spring seat.

5. The controllable backflow single-check valve for use in oil wells according to claim 2, characterized in that The valve seat is provided with a conical valve hole or an arc-shaped valve hole.

6. A backflow controllable one-way valve for use in oil wells according to claim 2, characterized in that, The valve core lifting assembly comprises a lifting rod, a plug and a connecting seat. The connecting seat outer wall is connected with the valve body lower end inner wall, the connecting seat center is provided with a threaded hole, the lifting rod is threadedly connected with the threaded hole and can be rotated up and down, and the lifting rod end outside the valve body is connected with the plug.

7. An oil and casing communication wellhead, comprising a tubing and a casing, said tubing being arranged in the casing, upper ends of said tubing and casing being connected to the wellhead, said wellhead being provided with a tubing line communicating with the tubing, said wellhead being provided with a casing line communicating with the annulus between the tubing and the casing, characterized in that, The backflow controllable check valve of claim 1 is also included. The casing line is communicated with the tubing line through the backflow controllable check valve, so that oil and gas in the casing line flows to the tubing line in one direction.

8. The tubing-casing communication wellhead of claim 7, wherein, The casing line is connected with the connecting port two of the backflow controllable check valve. A three-way pipe is also included, which is provided with a one-way port, a two-way port and a three-way port, the tubing line is connected with the one-way port of the three-way pipe, the two-way port of the three-way pipe is connected with the connecting port one of the backflow controllable check valve, and the three-way port of the three-way pipe is connected with the flow line.

9. The tubing-casing communication wellhead of claim 8, wherein, The tubing line is provided with a tubing valve, the casing line is provided with a casing valve, and the flow line is provided with a flow valve.

10. The tubing-casing communication wellhead of claim 9, wherein, The casing line is provided with a choke between the casing valve and the backflow controllable check valve.

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