A freezing-proof device for a water injection well head pressure gauge

Abstract

The utility model relates to oilfield exploitation oil displacement water injection well's wellhead pressure monitoring equipment technical field especially relates to a kind of water injection well wellhead pressure gauge anti-freezing device, comprising: upper connecting mechanism, flexible film and lower connecting mechanism.The upper connecting mechanism one end is used to connect pressure gauge, the other end of upper connecting mechanism connects lower connecting mechanism, and the end of lower connecting mechanism away from upper connecting mechanism is used to connect pressure gauge valve.Upper connecting mechanism and lower connecting mechanism inside have passageway respectively, and anti-freezing fluid is arranged in the passageway of upper connecting mechanism and lower connecting mechanism.The passageway of upper connecting mechanism corresponds with the passageway of lower connecting mechanism, and flexible film is arranged between the passageway of upper connecting mechanism and the passageway of lower connecting mechanism.Upper connecting mechanism and lower connecting mechanism are used to fix flexible film when inside liquid pushes the flexible film.The utility model can realize more accurate pressure transmission, effectively avoid the phenomenon that liquid in the lowermost end of the device is frozen in low temperature environment.

Description

Technical Field

[0001] This utility model relates to wellhead pressure monitoring equipment for oilfield water injection wells, and more particularly to an antifreeze device for the wellhead pressure gauge of a water injection well. Background Technology

[0002] Currently, oilfields mainly rely on water injection into the formation for oil displacement, which is then extracted through pumping wells. Monitoring the water injection pressure of the injection wells is a crucial parameter for allocating formation oil displacement energy. Since water injection wells are located outdoors year-round, and winter outdoor temperatures drop below 0°C, water can enter the pressure gauges installed at the wellheads and cause freezing blockage when measuring pressure values ​​in low-temperature winter conditions. This prevents the pressure gauges from displaying the current pressure value, and in severe cases, can cause the pressure gauge's spring tube to crack, rendering the gauge unusable. This affects the acquisition of pressure data in low-temperature winter conditions and impacts oilfield production. Utility Model Content

[0003] This invention proposes an antifreeze device for the pressure gauge at the wellhead of a water injection well to solve the problem that existing pressure gauges are prone to freezing and blockage in low-temperature winter environments, resulting in the pressure gauge being unable to accurately display the current pressure value of the water injection well.

[0004] According to one aspect of this disclosure, an antifreeze device for a water injection wellhead pressure gauge is provided, characterized in that it comprises: an upper connecting mechanism, a flexible diaphragm, and a lower connecting mechanism;

[0005] One end of the upper connecting mechanism is used to connect to a pressure gauge, and the other end of the upper connecting mechanism is connected to a lower connecting mechanism. The end of the lower connecting mechanism away from the upper connecting mechanism is used to connect to the pressure gauge valve.

[0006] The upper connecting mechanism and the lower connecting mechanism each have a channel inside, and antifreeze is placed inside the channels of the upper connecting mechanism and the lower connecting mechanism.

[0007] The channel of the upper connecting mechanism corresponds to the channel of the lower connecting mechanism, and a flexible membrane is provided between the channels of the upper connecting mechanism and the lower connecting mechanism.

[0008] The upper and lower connecting mechanisms are used to fix the flexible film when the internal liquid pushes the flexible film.

[0009] Preferably, the upper connecting mechanism includes: an upper connector and an upper pressure cap;

[0010] One end of the upper connector is connected to the upper pressure cap, and the other end of the upper connector is provided with an external thread that matches the internal thread of the pressure gauge;

[0011] The upper connector and the upper cover are provided with channels inside, and the upper cover is connected to the pressure gauge through the internal channel of the upper connector;

[0012] The end of the upper pressure cap away from the upper connector is provided with an external thread that matches the internal thread of the lower connecting mechanism.

[0013] Preferably, the lower connecting mechanism includes: a lower connector and a lower short connector;

[0014] One end of the lower connector is short-circuited to the lower part, and the other end of the lower connector is provided with an external thread that matches the internal thread of the pressure gauge valve;

[0015] The lower connector and the lower short connector are provided with internal channels, and the lower short connector is connected to the pressure gauge valve through the internal channels of the lower connector;

[0016] The lower short connector has an internal thread at the end furthest from the lower connector that matches the external thread of the upper connecting mechanism.

[0017] Preferably, it further includes: a sealing ring;

[0018] The upper connecting mechanism is provided with a first sealing groove at one end near the lower connecting mechanism;

[0019] The lower connecting mechanism has an annular protrusion inside, and a second sealing groove is provided on the annular protrusion;

[0020] The end of the upper connecting mechanism near the lower connecting mechanism is inserted into the interior of the lower connecting structure, and the first sealing groove corresponds to the second sealing groove;

[0021] The flexible film is installed inside the sealing ring, and the sealing ring is installed at the connection between the first sealing groove and the second sealing groove.

[0022] Preferably, the sealing ring is an O-ring.

[0023] Preferably, the first sealing groove and the second sealing groove are semi-circular arc-shaped sealing grooves with the same diameter as the sealing ring.

[0024] Preferably, the flexible film has a circular structure, and the diameter of the flexible film is larger than the diameter of the O-ring seal.

[0025] Preferably, the thickness of the flexible film is between 0.06mm and 0.08mm, and the maximum stretching length is 5-7 times.

[0026] This utility model has the following beneficial effects:

[0027] This utility model proposes an antifreeze device for the pressure gauge at the wellhead of a water injection well. By setting antifreeze inside the connecting mechanism and setting a flexible membrane between the upper and lower connecting mechanisms to transmit pressure, the pressure transmission is more accurate, effectively preventing the liquid entering the bottom of the device from freezing and becoming blocked in a low-temperature environment. Attached Figure Description

[0028] Appendix Figure 1 This is a schematic diagram of the structure of an antifreeze device for a water injection wellhead pressure gauge according to the present invention.

[0029] Appendix Figure 2 This is a schematic diagram of the upper pressure cover of this utility model.

[0030] Appendix Figure 3 This is a schematic diagram of the lower short-circuit of this utility model.

[0031] In the diagram, 1-upper connector, 2-upper gland, 3-sealing ring, 4-flexible film, 5-lower short connector, 6-first sealing groove, 7-second sealing groove, 8-lower connector. Detailed Implementation

[0032] Various exemplary embodiments, features, and aspects of the present invention will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0033] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0034] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0035] Furthermore, to better illustrate this utility model, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this utility model can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this utility model. Figure 1 This is a schematic diagram of the structure of an antifreeze device for a water injection wellhead pressure gauge according to this utility model; Figure 2 This is a schematic diagram of the upper pressure cap of this utility model; Figure 3 This is a schematic diagram of the lower short-circuit structure of this utility model; as shown... Figure 1-3 As shown, a water injection wellhead pressure gauge antifreeze device includes: an upper connecting mechanism, a flexible diaphragm 4, and a lower connecting mechanism;

[0036] One end of the upper connecting mechanism is used to connect to a pressure gauge, and the other end of the upper connecting mechanism is connected to a lower connecting mechanism. The end of the lower connecting mechanism away from the upper connecting mechanism is used to connect to the pressure gauge valve.

[0037] The upper connecting mechanism and the lower connecting mechanism each have a channel inside, and antifreeze is placed inside the channels of the upper connecting mechanism and the lower connecting mechanism.

[0038] The channel of the upper connecting mechanism corresponds to the channel of the lower connecting mechanism, and a flexible membrane is provided between the channels of the upper connecting mechanism and the lower connecting mechanism.

[0039] The upper and lower connecting mechanisms are used to fix the flexible film when the internal liquid pushes the flexible film.

[0040] In the embodiments of this utility model, such as Figure 1 As shown, during use, the end of the lower connecting mechanism furthest from the upper connecting mechanism is connected to the pressure gauge valve, and -40℃ antifreeze is injected into the lower connecting mechanism channel. The lower connecting mechanism channel has openings at both ends and is connected to the pressure gauge valve.

[0041] The end of the upper connecting mechanism furthest from the lower connecting mechanism is connected to a pressure gauge, and -40°C antifreeze is injected into the upper connecting mechanism channel. The upper connecting mechanism channel has openings at both ends and is connected to the pressure gauge.

[0042] The upper connecting mechanism is connected to the lower connecting mechanism, and the channels of the upper connecting mechanism and the lower connecting mechanism are positioned correspondingly. A flexible film is disposed between the upper connecting mechanism and the lower connecting mechanism, and the flexible film separates the internal channels of the upper connecting mechanism and the lower connecting mechanism.

[0043] When liquid in the injection well pipeline enters the lower connecting mechanism channel through the pressure gauge valve, it pushes the antifreeze in the lower connecting mechanism channel towards the diaphragm. The diaphragm deforms and moves into the upper connecting mechanism channel, pushing the antifreeze in the upper connecting mechanism towards the pressure gauge. This transmits the liquid pressure in the injection well pipeline to the pressure gauge for pressure detection. By using antifreeze, freezing blockage of the upper and lower connecting mechanisms is prevented in winter, and pressure is transmitted through the diaphragm to prevent liquid from entering the upper connecting mechanism.

[0044] In this utility model, the upper connecting mechanism includes: an upper connector and an upper pressure cap;

[0045] One end of the upper connector is connected to the upper pressure cap, and the other end of the upper connector is provided with an external thread that matches the internal thread of the pressure gauge;

[0046] The upper connector and the upper cover are provided with channels inside, and the upper cover is connected to the pressure gauge through the internal channel of the upper connector;

[0047] The end of the upper pressure cap away from the upper connector is provided with an external thread that matches the internal thread of the lower connecting mechanism.

[0048] In the embodiments of this utility model, such as Figure 2 As shown, the upper connector is provided with an external thread. One end of the upper connector is connected to the upper pressure cap, and the other end of the upper connector is connected to the pressure gauge through a threaded structure. The upper pressure cap is connected to the lower connecting mechanism through a threaded structure.

[0049] The upper connector and the upper gland are connected to the pressure gauge. The upper connector and the upper gland are filled with -40℃ antifreeze. When the liquid in the water injection well pipe reaches the lower connection mechanism through the pressure gauge valve, the liquid in the water injection well pipe pushes the antifreeze in the lower connection mechanism's internal channel toward the flexible membrane, pushing the flexible membrane and causing it to deform. The flexible membrane pushes the antifreeze in the upper gland and the upper connector channel into the pressure gauge, thus transmitting pressure. The pressure gauge then detects the pressure.

[0050] In this utility model, the lower connecting mechanism includes: a lower connector and a lower short connector;

[0051] One end of the lower connector is short-circuited to the lower part, and the other end of the lower connector is provided with an external thread that matches the internal thread of the pressure gauge valve;

[0052] The lower connector and the lower short connector are provided with internal channels, and the lower short connector is connected to the pressure gauge valve through the internal channels of the lower connector;

[0053] The lower short connector has an internal thread at the end furthest from the lower connector that matches the external thread of the upper connecting mechanism.

[0054] In the embodiments of this utility model, such as Figure 3 As shown, the lower connector is provided with an external thread. One end of the lower connector is connected to the lower short circuit, and the other end of the lower connector is connected to the pressure gauge valve through a threaded structure. The lower short circuit is connected to the upper gland through a threaded structure.

[0055] The lower connector is located below the pressure gauge valve, the lower short circuit is located below the lower connector, and the upper connector and upper gland are located below the lower short circuit.

[0056] The lower connector and the lower short-circuit channel are connected to the pressure gauge valve, and the lower connector and the lower short-circuit channel are filled with -40℃ antifreeze.

[0057] When the liquid in the injection well pipeline reaches the opening of the lower connector channel through the pressure gauge valve, it moves into the lower connector, pushing the antifreeze inside the lower connector and the lower short-circuit towards the diaphragm. The diaphragm pushes the liquid in the lower short-circuit channel towards the flexible diaphragm. The mixed liquid pushes the flexible diaphragm to deform, causing the flexible diaphragm to move towards the upper pressure cap. The flexible diaphragm pushes the antifreeze inside the upper pressure cap and the upper connector into the pressure gauge for pressure detection.

[0058] When the liquid in the water injection well pipeline reaches the lower connector, it will mix with the antifreeze in the lower connector and the lower short-circuit channel. The freezing point temperature of the mixed liquid in the lower short-circuit channel can be between -25℃ and 30℃. In the low-temperature environment of winter, it can ensure that the mixed liquid inside the lower short-circuit will not freeze and block the pressure, thus ensuring that the pressure gauge can display the pressure value normally in the low-temperature environment.

[0059] In this utility model, the upper connecting mechanism is provided with a first sealing groove 6 at one end near the lower connecting mechanism;

[0060] The lower connecting mechanism has an annular protrusion inside, and a second sealing groove 7 is provided on the annular protrusion;

[0061] The upper connecting mechanism is inserted into the lower connecting structure at one end near the lower connecting mechanism, and the first sealing groove 6 corresponds to the second sealing groove 7.

[0062] The flexible film 4 is installed inside the sealing ring 3, and the sealing ring 3 is installed at the connection between the first sealing groove 6 and the second sealing groove 7.

[0063] In this embodiment of the present invention, the upper pressure cap is provided with a first sealing groove at one end near the lower short connector, and the lower short connector has an annular protrusion inside, with a second sealing groove in the annular protrusion; the upper pressure cap is inserted into the lower short connector at one end, and the first sealing groove corresponds to the second sealing groove; a flexible film is installed inside the sealing ring, and the sealing ring is installed at the snap-fit ​​joint between the first sealing groove and the second sealing groove.

[0064] In this invention, the sealing ring 3 is an O-ring.

[0065] In this embodiment of the invention, the sealing ring is an O-ring made of corrosion-resistant rubber. It is positioned at the connection between the first sealing groove and the second sealing groove.

[0066] In this invention, the first sealing groove 6 and the second sealing groove 7 are semi-circular arc-shaped sealing grooves with the same diameter as the sealing ring.

[0067] In this embodiment of the utility model, both the first sealing groove and the second sealing groove are semi-circular arc-shaped sealing grooves with the same diameter as the sealing ring, and they fit tightly with the sealing ring after installation.

[0068] In this invention, the flexible film 4 has a circular structure, and the diameter of the flexible film 4 is larger than the diameter of the O-ring seal.

[0069] In this embodiment of the utility model, the flexible film has a circular structure with a diameter larger than that of the O-ring seal. During installation, the flexible film is covered with adhesive on the sealing ring and pressed together with the sealing ring between the first sealing groove and the second sealing groove. The flexible film and the sealing ring separate the internal channel of the upper pressure cap from the lower short-circuit sealing channel, preventing the mixed liquid in the lower short-circuit channel from mixing with the antifreeze in the upper pressure cap channel.

[0070] In this invention, the thickness of the flexible film 4 is between 0.06mm and 0.08mm, and the maximum stretching length is 5-7 times.

[0071] In this embodiment of the invention, the flexible membrane is made of polyurethane, which is corrosion-resistant and has high tensile strength, with a thickness of 0.06mm-0.08mm. The membrane is stretched upwards, pushing against the upper antifreeze. The antifreeze enters the pressure gauge, displaying the current pressure value. Because the flexible membrane is easily deformable and thin, its deformation resistance is small and does not affect the liquid pressure in the pipe, resulting in more accurate pressure transmission and a smaller error value. It is understood that the various method embodiments mentioned above in this invention can be combined with each other to form combined embodiments without violating the underlying principles. Due to space limitations, these will not be elaborated further in this invention.

[0072] The main problems addressed by this invention are: First, the antifreeze pressure gauge uses a flexible diaphragm deformation for pressure transmission, and a sealing ring is installed on the diaphragm, reducing the friction between the piston and the inner wall of the short circuit in traditional devices, thus solving the problem of pressure transmission errors and low accuracy. Second, antifreeze is provided at the lower end of the diaphragm, which, when mixed with the liquid in the water injection well pipeline, also provides antifreeze properties. This solves the problem in traditional devices where, when the liquid in the water injection well pipeline pushes the piston to its highest point, although the antifreeze entering the pressure gauge from the upper part of the piston does not cause freezing blockage, the prolonged low temperature of the liquid below the piston can cause the antifreeze pressure gauge short circuit to freeze and become blocked, resulting in the pressure gauge failing to display the pressure value correctly.

[0073] The antifreeze device for the pressure gauge at the head of a water injection well provided by this utility model has at least the following advantages:

[0074] (1) The pressure transmission method uses -40℃ antifreeze to transmit pressure, and a flexible membrane is used to separate the upper and lower chambers. Since the membrane is only 0.06mm-0.08mm thick, has high tensile strength and good corrosion resistance, the transmitted pressure is accurate and the measured pressure value error is small, which improves the accuracy of the water injection well test data.

[0075] (2) Antifreeze is injected into the lower end of the device. When the pressure is measured, the liquid in the water injection well pipe enters the lower part of the device and can mix with the antifreeze. The mixture is blocked by the flexible membrane and does not mix with the antifreeze on the membrane. After the liquid in the water injection well pipe and the antifreeze are mixed, the freezing point temperature can still reach about -25℃ to -30℃. There will be no freezing blockage in the outdoor low temperature environment.

[0076] (3) It improved the efficiency and accuracy of wellhead pressure data acquisition for water injection wells in low-temperature winter conditions, providing data support for the formulation of reasonable water injection well testing and retrieval plans. It not only effectively improved testing efficiency, but also provided an important guarantee for water injection oil displacement development in oil fields.

[0077] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A device for preventing freezing of a water injection wellhead pressure gauge, characterized in that, include: Upper connecting mechanism, flexible film (4) and lower connecting mechanism; One end of the upper connecting mechanism is used to connect to a pressure gauge, and the other end of the upper connecting mechanism is connected to a lower connecting mechanism. The end of the lower connecting mechanism away from the upper connecting mechanism is used to connect to the pressure gauge valve. The upper connecting mechanism and the lower connecting mechanism each have a channel inside, and antifreeze is placed inside the channels of the upper connecting mechanism and the lower connecting mechanism. The channel of the upper connecting mechanism corresponds to the channel of the lower connecting mechanism, and a flexible film (4) is provided between the channel of the upper connecting mechanism and the channel of the lower connecting mechanism. The upper and lower connecting mechanisms are used to fix the flexible film (4) when the internal liquid pushes the flexible film (4).

2. The antifreeze device for the wellhead pressure gauge of the water injection well according to claim 1, characterized in that: The upper connection mechanism includes: an upper connector (1) and an upper pressure cap (2); One end of the upper connector (1) is connected to the upper cover (2), and the other end of the upper connector (1) is provided with an external thread that matches the internal thread of the pressure gauge; The upper connector (1) and the upper cover (2) are provided with channels inside, and the upper cover (2) is connected to the pressure gauge through the internal channel of the upper connector (1); The upper pressure cap (2) has an external thread at the end away from the upper connector that matches the internal thread of the lower connecting mechanism.

3. The antifreeze device for the wellhead pressure gauge of the water injection well according to claim 1, characterized in that: The lower connection mechanism includes: a lower connector (8) and a lower short connector (5); One end of the lower connector (8) is connected to the lower short connector (5), and the other end of the lower connector (8) is provided with an external thread that matches the internal thread of the pressure gauge valve; The lower connector (8) and the lower short connector (5) are provided with internal channels, and the lower short connector (5) is connected to the pressure gauge valve through the internal channel of the lower connector (8); The lower short connector (5) has an internal thread at the end away from the lower connector (8) that matches the external thread of the upper connecting mechanism.

4. The freeze protection apparatus for a water injection wellhead pressure gauge of claim 3, wherein, Also includes: Sealing ring; The upper connecting mechanism is provided with a first sealing groove (6) at one end near the lower connecting mechanism. The lower connecting mechanism has an annular protrusion inside, and a second sealing groove is provided on the annular protrusion; The upper connecting mechanism is inserted into the lower connecting structure at one end near the lower connecting mechanism, and the first sealing groove (6) corresponds to the second sealing groove (7); The flexible film (4) is installed inside the sealing ring (3), and the sealing ring (3) is installed at the connection between the first sealing groove (6) and the second sealing groove (7).

5. The antifreeze device for the wellhead pressure gauge of the water injection well according to claim 4, characterized in that: The sealing ring (3) is an O-ring.

6. The antifreeze device for the wellhead pressure gauge of the water injection well according to claim 4, characterized in that: The first sealing groove (6) and the second sealing groove (7) are semi-circular arc-shaped sealing grooves with the same diameter as the sealing ring (3).

7. The antifreeze device for the wellhead pressure gauge of the water injection well according to claim 4, characterized in that: The flexible film (4) has a circular structure, and the diameter of the flexible film (4) is larger than the diameter of the O-ring seal (3).

8. The antifreeze device for the wellhead pressure gauge of a water injection well according to any one of claims 1-7, characterized in that: The thickness of the flexible film (4) is between 0.06mm and 0.08mm, and the maximum stretch length is 5-7 times.

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