Crude oil sampling collector with gas-liquid separation function

Abstract

This utility model discloses a crude oil sampling and collection device with gas-liquid separation function, including a buffer. An inlet pipe is installed at the top of the buffer, an oil sample outlet is installed at the bottom of the buffer, and an associated gas outlet is installed on the side wall of the buffer. One end of the inlet pipe is inserted into the buffer, and the other end is equipped with an inlet needle valve. This utility model is particularly suitable for sampling operations of high-gas-content crude oil on offshore platforms, enabling effective separation of oil and gas during sampling. The associated gas is discharged from the upper side of the sphere, while the sampled crude oil is discharged from the bottom of the sphere. The associated gas can be centrally discharged through connecting pipelines, avoiding interference with combustible gas probes. The reduced flow rate of crude oil from the oil sample outlet prevents splashing and avoids environmental pollution.

Description

Technical Field

[0001] This utility model belongs to the technical field of multiphase flow sampling equipment for oil and gas fields, specifically relating to a crude oil sampler with gas-liquid separation function. Background Technology

[0002] In offshore oil field development, there are two major technical bottlenecks in sampling crude oil containing associated gas that has not been fully separated:

[0003] 1. Gas-liquid two-phase flow leads to sample composition distortion: According to API RP 45 (R2012) standard test, the gas phase volume fraction error of traditional direct sampling method can reach 35%-50%;

[0004] 2. Safety and environmental risks: The instantaneous emission of associated gas can easily trigger the alarm of combustible gas detectors, and the high-speed crude oil flow (>3m / s) can cause a deck contamination rate as high as 72%.

[0005] Existing technologies, such as the samplers used in patents like CN218188338U, suffer from drawbacks such as requiring motors, complex structures, and numerous vulnerable parts. Furthermore, the manual sampling method recommended by GB / T 4756-2015 requires complex pre-processing equipment, which is difficult to meet platform space constraints. Therefore, there is an urgent need to develop a compact online separation and sampling device. Utility Model Content

[0006] This invention is proposed to solve the problems of detection errors and safety risks caused by gas-liquid interference in traditional sampling methods. Its purpose is to provide a crude oil sampler with gas-liquid separation function.

[0007] This utility model is achieved through the following technical solution:

[0008] A crude oil sampling collector with gas-liquid separation function includes a buffer, an inlet pipe at the top of the buffer, an oil sample outlet at the bottom of the buffer, and an associated gas outlet on the side wall of the buffer; one end of the inlet pipe is inserted into the buffer, and the other end is equipped with an inlet needle valve.

[0009] In the above technical solution, the inlet needle valve is detachably connected to the inlet pipe, and the other end is the oil sample inlet.

[0010] In the above technical solution, the axes of the inlet pipe, the associated gas outlet, and the oil sample outlet are all arranged radially along the buffer, and the inlet pipe and the oil sample outlet are arranged coaxially.

[0011] In the above technical solution, the inlet pipe, associated gas outlet, and oil sample outlet are all connected to the buffer by argon arc welding.

[0012] In the above technical solution, the inlet pipe is composed of a vertical section connected to the buffer and an end jet section placed in the inner cavity of the buffer. The vertical section and the end jet section are integrally formed, and the included angle β between the axis of the vertical section and the axis of the end jet section is 140° to 160°. The vertical section and the end jet section are rounded. The radius of curvature R of the rounded transition satisfies R = 1.2-1.5D, where D is the inner diameter of the inlet pipe.

[0013] In the above technical solution, the buffer is a spherical structure with a diameter-to-thickness ratio of 1. The buffer is integrally formed from 316L stainless steel by spinning process, and its inner surface roughness Ra≤3.2μm.

[0014] In the above technical solution, the included angle α between the axis of the associated gas outlet and the axis of the vertical section of the inlet pipe is 55° to 65°.

[0015] The beneficial effects of this utility model are:

[0016] This invention provides a crude oil sampling device with gas-liquid separation function, particularly suitable for sampling high-gas-content crude oil on offshore platforms. During sampling, the oil-gas mixture is effectively separated within the buffer sphere due to collision, buffering, swirling, and pressure-reducing condensation. Associated gas is discharged from the upper side of the sphere, while the sampled crude oil is discharged from the bottom. The associated gas discharged using this device can be centrally discharged via connecting pipelines, avoiding interference with combustible gas probes. Furthermore, the device can collect the discharged associated gas using a gas collection bag for H2S testing, making the test data more accurate. The reduced crude oil flow rate from the oil sample outlet prevents splashing and avoids environmental pollution. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] in:

[0019] 1. Imported needle valve; 2. Imported tube; 3. Buffer; 4. Associated gas discharge port; 5. Oil sample discharge port.

[0020] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1As shown, a crude oil sampling collector with gas-liquid separation function includes a buffer 3, an inlet pipe 2 at the top of the buffer 3, an oil sample outlet 5 at the bottom of the buffer 3, and an associated gas outlet 4 on the side wall of the buffer 3; one end of the inlet pipe 2 is inserted into the buffer 3, and the other end is equipped with an inlet needle valve 1.

[0023] The inlet needle valve 1 is detachably connected to the inlet pipe 2, and the other end is the oil sample inlet.

[0024] The axes of the inlet pipe 2, the associated gas outlet 4, and the oil sample outlet 5 are all arranged radially along the buffer 3, and the inlet pipe 2 and the oil sample outlet 5 are arranged coaxially.

[0025] The inlet pipe 2, associated gas outlet 4, and oil sample outlet 5 are all connected to the buffer 3 by argon arc welding.

[0026] The inlet pipe 2 consists of a vertical section connected to the buffer 3 and an end jet section placed inside the buffer 3. The vertical section and the end jet section are integrally formed, and the included angle β between the axis of the vertical section and the axis of the end jet section is 140° to 160°. The vertical section and the end jet section are rounded. The radius of curvature R of the rounded transition satisfies R = 1.2D to 1.5D, where D is the inner diameter of the inlet pipe 2.

[0027] The buffer 3 has a spherical structure with a diameter-to-thickness ratio of 40 to 60:1. The buffer 3 is integrally formed from 316L stainless steel by spinning process, and its inner surface roughness Ra≤3.2μm.

[0028] The angle α between the axis of the associated gas outlet 4 and the axis of the vertical section of the inlet pipe 2 is 55° to 65°.

[0029] The associated gas outlet 4 is equipped with a detachable gas collection interface that conforms to the ISO 1609 standard quick connector specification.

[0030] How to use this utility model:

[0031] In this utility model, the buffer forms a multiphase flow buffer separation chamber; the inlet needle valve 1 and the inlet pipe 2 form a sampling channel with a diameter of Φ6-10mm, and the two together constitute an inlet flow control mechanism; the gas discharge port 4 and the oil sample discharge port 5 constitute the gas-liquid phase separation discharge mechanism of this utility model.

[0032] When the crude oil sampler is sampling crude oil, the inlet needle valve 1 is connected to the inlet pipe 2 via an OD connection. This needle valve is used to connect and open / close the crude oil sampling port. The inlet pipe 2 is inserted into the spherical buffer 3, and the insertion port is sealed by argon arc welding. The spherical buffer 3 is a hollow stainless steel sphere. The inlet pipe 2 is bent inside the spherical buffer 3 at a 150° angle to the vertical direction. The associated gas outlet 4 is connected to the side of the spherical buffer 3 by argon arc welding at a 60° angle to the vertical direction. The oil sample outlet 5 is connected to the bottom of the spherical buffer 3 by argon arc welding, pointing vertically downwards.

[0033] The high-speed oil-gas mixture entering the interior through the inlet needle valve 1 and inlet pipe 2 impacts the arc-shaped inner surface of the spherical buffer 3, causing the multiphase flow to generate a centrifugal force field, thus achieving preliminary separation of oil and gas. The pressure drop caused by the sudden change in the volume of the spherical cavity promotes the precipitation of dissolved gas. The associated gas generates the Coanda effect through the associated gas outlet 4, improving the gas phase extraction rate. The crude oil enters the collection container through the oil sample outlet 5.

[0034] This invention utilizes a spherical buffer 3 to construct a multiphase flow buffer separation chamber, and employs a 150° impact angle guide structure at the end of the inlet pipe 2 to induce a swirling separation effect in crude oil containing associated gas. Testing shows that under an inlet pressure of 0.5 MPa to 2.0 MPa, this device can achieve a gas-liquid separation efficiency of over 92%. The separated associated gas is directionally discharged through an outlet 4 with an inclination angle of 55° to 65°, which can be connected to a gas collection device for H2S detection. The crude oil flow rate is reduced to 0.3 m / s to 0.8 m / s through a three-stage gradually expanding oil sample outlet 5, effectively preventing splash contamination.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] The applicant declares that the above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model fall within the protection and disclosure scope of the present utility model.

Claims

1. A crude oil sampling and collection device with gas-liquid separation function, characterized in that: Includes a buffer (3), with an inlet pipe (2) at the top of the buffer (3), an oil sample outlet (5) at the bottom of the buffer (3), and an associated gas outlet (4) on the side wall of the buffer (3); one end of the inlet pipe (2) is inserted into the buffer (3), and the other end is equipped with an inlet needle valve (1).

2. The crude oil sampling and collection device with gas-liquid separation function according to claim 1, characterized in that: The inlet needle valve (1) is detachably connected to the inlet pipe (2), and the other end is the oil sample inlet.

3. The crude oil sampling and collection device with gas-liquid separation function according to claim 1, characterized in that: The axes of the inlet pipe (2), associated gas outlet (4) and oil sample outlet (5) are all arranged radially along the buffer (3), and the inlet pipe (2) and oil sample outlet (5) are arranged coaxially.

4. The crude oil sampling and collection device with gas-liquid separation function according to claim 1, characterized in that: The inlet pipe (2), associated gas outlet (4), and oil sample outlet (5) are all connected to the buffer (3) by argon arc welding.

5. The crude oil sampling and collection device with gas-liquid separation function according to claim 1, characterized in that: The inlet pipe (2) is composed of a vertical section connected to the buffer (3) and an end jet section placed in the inner cavity of the buffer (3). The vertical section and the end jet section are integrally formed, and the included angle β between the axis of the vertical section and the axis of the end jet section is 140° to 160°. The vertical section and the end jet section are rounded. The radius of curvature R of the rounded transition satisfies R = 1.2-1.5D, where D is the inner diameter of the inlet pipe (2).

6. The crude oil sampling and collection device with gas-liquid separation function according to claim 1, characterized in that: The buffer (3) is a spherical structure with a diameter-to-thickness ratio of (40-60):

1. The buffer (3) is integrally formed from 316L stainless steel by spinning process, and its inner surface roughness Ra≤3.2μm.

7. The crude oil sampling and collection device with gas-liquid separation function according to claim 1, characterized in that: The angle α between the axis of the associated gas outlet (4) and the axis of the vertical section of the inlet pipe (2) is 55° to 65°.

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