Anti-freezing and anti-splashing emptying sampling device for oil well

Abstract

The anti-freezing and anti-splashing emptying sampling device comprises an outer valve body, the outer valve body is directly installed at the position, close to an oil outlet pipeline channel, of an upper screwed plug of an original wellhead back-pressure valve, and the inner space of the valve body is filled with an inner valve seat and a valve element guide rod in the valve body; a 45-degree sealing tip is arranged at the front end of a valve element guide rod and matched with a 45-degree umbrella-shaped sealing face in the valve body to achieve sealing, a sampling port short section is in screwed connection with a gas-liquid separation protection device, oil and gas are separated according to the collision separation working principle of an oil-gas separator, sampled crude oil is prevented from splashing, and the device is convenient to carry, diversified in function, simple and reasonable to operate and suitable for popularization and application. The application is wide.

Description

Technical Field

[0001] The present invention belongs to the technical field of a quick-installation anti-freezing and anti-spraying emptying sampling tool for oil well maintenance, and relates to an oil well anti-freezing and anti-spraying emptying sampling device. Background Art

[0002] With the progress of oilfield development, the water content in oil production wells gradually increases during the daily production maintenance process. Sampling and testing work has also become the main work required for daily production index analysis. There are many areas in the oilfield with low ambient temperatures, and the well flushing maintenance method is commonly used. The existing sampling valve is a needle valve, and the front and rear nipples and tees are relatively long in size. In an environment with extremely low ambient temperatures, problems such as freezing and blockage are extremely likely to occur. The on-site employees can only take measures such as pouring hot water to heat the sampling valve and the front and rear nipples for operation, and the work efficiency is relatively low. During winter production, during the daily oil well pressure build-up (observing the pump condition) and sampling and emptying processes of oil wells, the pressure gauges, sampling gates, and emptying sample ports frequently freeze and block, which not only causes inaccurate pressure build-up data, difficult sampling, but also poses a risk of oil and gas leakage during the operation process. If not discovered and handled in time, it is likely to cause pollution accidents in the standardized site. Secondly, in the case of abnormal pressure relief, misoperation may cause object strikes, posing a greater safety hazard. Therefore, the research and invention of an anti-freezing emptying sampling device was carried out and promoted and applied on-site. Summary of the Invention

[0003] The purpose of the present invention is to provide an oil well anti-freezing and anti-spraying emptying sampling device, which solves the problems existing in the prior art.

[0004] The technical solution adopted by the present invention is that an oil well anti-freezing and anti-spraying emptying sampling device includes a valve body. A valve core guide rod is arranged inside the valve body. A sampling port is opened at the bottom of the valve body. The sampling port is connected to the valve core guide rod, and one end of the sampling port far from the valve core guide rod is connected to a gas-liquid separation protection device.

[0005] The characteristics of the present invention further lie in that:

[0006] The valve body includes an outer valve body installed at the upper plug of the original wellhead backpressure valve. One end of the outer valve body is connected to an inner valve seat, and a valve core guide rod is sequentially passed through the inner valve seat and the outer valve body;

[0007] The valve core guide rod is arranged along the axial directions of the outer valve body and the inner valve body. Guide grooves are opened in the outer valve body and the inner valve body and are matched with the valve core guide rod;

[0008] The valve core guide rod is composed of two coaxial rod bodies with different diameters. The rod body with a smaller diameter extends into the outer valve body, and the rod body with a larger diameter is located inside the inner valve body. The guide groove includes a small groove body that sequentially passes through the inner valve body and the outer valve body and is matched with the rod body with a smaller diameter of the valve core guide rod, and also includes a large groove body located inside the inner valve body and fitted with the rod body with a larger diameter of the valve core guide rod. The large groove body is communicated with the small groove body;

[0009] One end of the rod body with a smaller diameter of the valve core guide rod, which is far from the rod body with a larger diameter, has a 45° sealing tip structure. The sealing tip structure extends out of the outer valve body, and the rod body with a smaller diameter is coaxially and spaced apart from the small groove body.

[0010] The sampling port is located at the junction of the large groove body and the small groove body in the inner valve body and is communicated with the small groove body.

[0011] A sampling port short section is embedded in the sampling port, and one end of the sampling port short section far from the sampling port is connected with a gas-liquid separation protection device by a screw thread.

[0012] The gas-liquid separation protection device includes a funnel-shaped shell. The contraction end of the funnel-shaped shell is connected with the sampling port short section, and the open end is connected with a sampling bucket around its edge. A plurality of air holes are also arranged around the arc surface of the open end.

[0013] The beneficial effects of the present invention are

[0014] The anti-freezing, anti-spraying and emptying sampling device for oil wells of the present invention is applicable to operations such as sampling and emptying during the production process of oil wells. The anti-freezing, anti-spraying and emptying sampling device has a simple and practical structure, is simple and quick to install, does not change the existing wellhead gathering and transportation process, and does not require welding, so it has strong practicability. It solves many drawbacks such as complex sampling and emptying operation procedures and large potential safety hazards caused by freezing and blocking of the sampling and emptying channels during winter production for many years. After using the anti-freezing sampling and emptying valve, it can effectively prevent the freezing of the sampling port during winter production, smoothly complete the sampling and emptying work during winter production, effectively reduce the production cost and labor intensity, and ensure the safe production of on-site employees. The features of this tool are: simple and reasonable operation, and wide application. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the anti-freezing, anti-spraying and emptying sampling device for oil wells of the present invention.

[0016] In the figure, 1. Outer valve body, 2. Inner valve seat, 3. Valve core guide rod, 4. Sampling port short section, 5. Gas-liquid separation protection device, 6. Air hole, 7. Sampling bucket. Detailed Description of the Invention

[0017] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0018] The present invention provides an anti-freezing, anti-spraying and emptying sampling device for oil wells, which is specifically shown in the following embodiments:

[0019] Embodiment 1, the anti-freezing, anti-spraying and emptying sampling device for oil wells of the present invention meets various requirements for the maintenance and sampling of oil and water wells, and has stronger versatility and portability. The specific design idea is as follows:

[0020] AsFigure 1 As shown, it includes an outer valve body 1, an inner valve seat 2, a valve core guide rod 3, a sampling port nipple 4, and a gas-liquid separation protection device 5. The outer valve body 1 is directly installed at the upper plug of the original wellhead backpressure valve, near the oil outlet pipeline channel. The inner space of the valve body is filled with the inner valve seat 2 and the valve core guide rod 3. There is a 45° sealing tip at the front end of the valve core guide rod 3, which cooperates with the 45° umbrella-shaped sealing surface inside the valve body to achieve sealing.

[0021] Example 2, an anti-freezing, anti-spraying and venting sampling device for oil wells, the specific structure is as follows:

[0022] The outer valve body 1 is directly installed at the upper plug of the original wellhead backpressure valve, near the oil outlet pipeline channel. The inner space of the valve body is filled with the inner valve seat 2 and the valve core guide rod 3. There is a 45° sealing tip at the front end of the valve core guide rod 3, which cooperates with the 45° umbrella-shaped sealing surface inside the valve body to achieve sealing. Since the valve core guide rod 3 is composed of two coaxial rod bodies with different diameters, the small-diameter rod body passes through the inner valve seat 2 and the outer valve body 1 in sequence and points to the inside of the valve body. The 45° sealing tip is located at the end of the small-diameter rod body. The other end of the small-diameter rod body is connected to the large-diameter rod body. The large-diameter rod body is located inside the inner valve seat 2. A small groove body that cooperates with the small-diameter rod body is provided and is communicated with the outer valve body 1 and the inner valve seat 2. The small groove body is coaxial with the small-diameter rod body and does not contact each other, that is, the diameter of the small groove body is slightly larger than that of the small-diameter rod body but smaller than the outer diameter of the large-diameter rod body. A large groove body that moves in cooperation with the large-diameter rod body is provided inside the inner valve seat 2. The large groove body is fitted with the large-diameter rod body. A stepped groove body is provided to limit the valve core guide rod 3. When the large-diameter rod body moves to the small groove body during the displacement of the valve core guide rod 3, the valve core guide rod can be limited to prevent excessive displacement from affecting sampling. The sampling port is arranged at the junction of the large groove body and the small groove body and is perpendicular to the small groove body. The sampling port nipple 4 is embedded in the sampling port. The sampling port nipple 4 is threadedly connected to the gas-liquid separation protection device 5. The collision separation working principle of the oil-gas separator is adopted to separate oil and gas to avoid splashing of the sampled crude oil. The air outlet 6 is used for exhausting gas.

[0023] Example 3, the usage process of the anti-freezing, anti-spraying and venting sampling device for oil wells is as follows:

[0024] The outer valve body 1 is installed at the upper plug of the original wellhead backpressure valve and at the part of the oil inlet and outlet pipeline channel. The liquid is in a long-term flowing state at the external inlet of the valve body. The inner valve seat 2 and the valve core guide rod 3 fill the internal space of the valve body, which can effectively prevent the freezing blockage in the cold season after the well fluid fills the inside of the valve body. At the same time, there is a 45° sealing tip at the front end of the valve core guide rod 3, which cooperates with the 45° umbrella-shaped sealing surface inside the valve body to achieve sealing. When the valve is opened, the valve core guide rod 3 retracts, creating a gap between the sealing tip and the 45° umbrella-shaped sealing surface inside the valve body. The fluid flows out between the sealing tip and the 45° umbrella-shaped sealing surface inside the valve body. Since the small-diameter rod body of the valve core guide rod 3 is separated from the guide groove, the fluid flows out along the gap to the sampling port, then flows through the sampling port nipple 4 to the gas-liquid separation and protection device 5. After gas-liquid separation by collision, the fluid enters the sampling bucket 7, and the air vent 6 is used for exhausting gas.

Claims

1. Oil well anti-freezing, anti-spraying and blowdown sampling device, Characterized in that, It includes a valve body, a valve core guide rod (3) is arranged inside the valve body, a sampling port is opened at the bottom of the valve body, the sampling port is connected to the valve core guide rod (3), and one end of the sampling port far from the valve core guide rod (3) is connected to a gas-liquid separation protection device (5).

2. The oil well anti-freezing, anti-spraying and blowdown sampling device according to claim 1, Characterized in that, The valve body includes an outer valve body (1) installed at the upper plug of the original wellhead backpressure valve, one end of the outer valve body (1) is connected to an inner valve seat (2), and a valve core guide rod (3) is connected through the inner valve seat (2) and the outer valve body (1) in sequence.

3. The oil well anti-freezing, anti-spraying and blowdown sampling device according to claim 2, Characterized in that, The valve core guide rod (3) is arranged along the axial direction of the outer valve body (1) and the inner valve body (2), and guide grooves matched with the valve core guide rod (3) are opened in the outer valve body (1) and the inner valve body (2).

4. The oil well anti-freezing, anti-spraying and blowdown sampling device according to claim 3, Characterized in that, The valve core guide rod (3) is composed of two coaxial rod bodies with different diameters. The rod body with a smaller diameter extends into the outer valve body (1), and the rod body with a larger diameter is located inside the inner valve body (2). The guide groove includes a small groove body that sequentially passes through the inner valve body (2) and the outer valve body (1) and is matched with the rod body with a smaller diameter of the valve core guide rod (3), and also includes a large groove body located inside the inner valve body (2) and fitted with the rod body with a larger diameter of the valve core guide rod (3). The large groove body is communicated with the small groove body.

5. The oil well anti-freezing, anti-spraying and blowdown sampling device according to claim 4, Characterized in that, One end of the rod body with a smaller diameter of the valve core guide rod (3) far from the rod body with a larger diameter is a 45° sealing tip structure. The sealing tip structure extends out of the outer valve body (1), and the rod body with a smaller diameter and the small groove body are coaxially and spaced apart.

6. The oil well anti-freezing, anti-spraying and blowdown sampling device according to claim 4, Characterized in that, The sampling port is located at the connection of the large groove body and the small groove body inside the inner valve body (2) and is communicated with the small groove body.

7. The oil well anti-freezing, anti-spraying and blowdown sampling device according to claim 5, Characterized in that, A sampling port short section (4) is embedded in the sampling port, and one end of the sampling port short section (4) far from the sampling port is connected to a gas-liquid separation protection device (5) by a thread.

8. The oil well anti-freezing, anti-spraying and blowdown sampling device according to claim 7, Characterized in that, The gas-liquid separation protection device (5) includes a funnel-shaped shell. The contraction end of the funnel-shaped shell is connected to the sampling port short section (4), and the open end is connected with a sampling bucket (7) around its edge. A plurality of air holes (6) are also opened around the arc surface of the open end.

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