Underwater three-phase separation device for oil-gas mixed transportation

Abstract

The invention discloses an oil-gas mixed transportation underwater three-phase separation device, which comprises a deepwater three-phase separation tank, which is internally provided with an oil-gas mixing cabin and a water cabin; the oil-gas mixing output outlet pipe is arranged in the oil-gas mixing cabin; the electric opening adjusting valve and the one-way circulation valve are connected with the oil-gas mixed output outlet pipe, and the oil-gas mixed phase is output to a downstream treatment device through the electric opening adjusting valve and the one-way circulation valve; the underwater centrifugal pump and the electric on-off valve are connected with the water tank, and the water phase is reinjected to the stratum through the underwater centrifugal pump and the electric on-off valve; the pressure meter is arranged in the oil-gas mixing cabin and is electrically connected with the electric opening adjusting valve; and the liquid level meter is arranged in the water cabin and is electrically connected with the underwater centrifugal pump and the electric on-off valve. Separated oil and natural gas are mixed and conveyed, the structure is simplified, the device is suitable for a deepwater underwater three-phase separation scene, the reliability of an underwater separation system is improved, and automatic control over a water path and an oil-gas mixed conveying path is achieved through liquid level control and pressure control logic.

Description

Technical Field

[0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to an underwater three-phase separation device for oil and gas mixed transportation. Background Art

[0002] Oil, gas and water three-phase separation is an important part of oil development. By pre-separating the produced fluid into three phases, oil and gas can be transported to the next level of processing, reducing the pressure of subsequent processing processes. In fact, most of the natural gas and oil separated by three-phase separation tanks on land or at sea are currently transported separately in phases. If the sedimentation three-phase separation device is applied to underwater environments, the unique usage scenario puts forward more stringent requirements for the maintenance of the structure. However, the existing oil and gas phase separation external transmission method is difficult to adapt to the underwater environment's requirements for device reliability due to its complex pipelines and auxiliary components. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an underwater three-phase separation device for oil and gas mixed transportation, which aims to mix and transport the separated oil and natural gas, simplify the structure, and improve the reliability of the device.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an underwater three-phase separation device for oil-gas mixed transmission, characterized in that it comprises: a deep-water three-phase separation tank, wherein a partition is arranged inside the deep-water three-phase separation tank to separate the inside into an oil-gas mixed tank and a water tank; an oil-gas mixed output outlet pipe, which is arranged in the oil-gas mixed tank of the deep-water three-phase separation tank and is detachably connected to the tank bottom outlet; an electric opening regulating valve and a one-way flow valve, which are connected to the oil-gas mixed output outlet pipe through an oil-gas external transmission pipeline, and the oil-gas mixed phase is externally transmitted to a downstream processing device through the electric opening regulating valve and the one-way flow valve; an underwater centrifugal pump and an electric opening and closing valve, which are connected to the oil-gas mixed output outlet pipe through an oil-gas external transmission pipeline. The water phase transmission pipeline is connected to the water tank of the deepwater three-phase separation tank, and the water phase is injected back into the formation through the underwater centrifugal pump and the electric opening and closing valve; the pressure gauge is arranged in the oil and gas mixing tank of the deepwater three-phase separation tank and is electrically connected to the electric opening regulating valve, and is used to monitor the pressure in the oil and gas mixing tank and control the opening of the electric opening regulating valve, so as to realize automatic pressure control of the oil and gas mixed transmission line; the liquid level gauge is arranged in the water tank of the deepwater three-phase separation tank and is electrically connected to the underwater centrifugal pump and the electric opening and closing valve, and is used to monitor the liquid level in the water tank and control the opening and closing of the underwater centrifugal pump and the electric opening and closing valve, so as to realize automatic liquid level control of the waterway.

[0005] Preferably, the oil-gas mixed output outlet pipe adopts a regular pipe section as the first main pipe, a plurality of openings are evenly arranged on the first main pipe, and the lower end of the first main pipe forms a first connector suitable for connecting to the deepwater three-phase separation tank.

[0006] Preferably, the oil-gas mixed output outlet pipe adopts a regular pipe section as the second main pipe, a branch pipe connected to the second main pipe is arranged on the pipe wall of the second main pipe, and the inlet of the branch pipe is arranged at a high point to introduce gas, and liquid is replaced by gas injection, and the lower end of the second main pipe forms a second connecting piece suitable for connecting to the deepwater three-phase separation tank.

[0007] Preferably, the oil-gas mixed output outlet pipe adopts a regular pipe section as the third main pipe, the upper end of the third main pipe is beveled and serrated to form a serrated bevel inlet, and the lower end of the third main pipe forms a third connecting piece suitable for connecting to the deepwater three-phase separation tank.

[0008] Preferably, the first connecting piece, the second connecting piece and the third connecting piece can be connected to the deep-water three-phase separation tank by means of threads or quick connections.

[0009] The present invention adopts the above technical solution, which has the following advantages: 1. The present invention combines the oil and gas transmission pipelines to ensure that the oil and gas are fully mixed, reduce the number of underwater pipelines and valve components, simplify the underwater separation process and control, and reduce the probability of failure.

[0010] 2. The underwater three-phase separation device provided by the present invention can realize self-balanced matching of oil and gas for the oil-gas-water three-phase separation tank, reduce the complexity of the export pipeline, is suitable for deepwater underwater three-phase separation scenarios, improves the reliability of the underwater separation system, and realizes automatic control of the waterway and the oil-gas mixed transmission line respectively through liquid level control and pressure control logic. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings: Figure 1 A schematic diagram of the structure of the underwater three-phase separation device provided by the present invention; Figure 2 A schematic diagram of the structure of a deep-water three-phase separation tank provided by the present invention; Figure 3 A schematic diagram of the structure of the first oil-gas mixed output outlet pipe provided by the present invention; Figure 4 A schematic diagram of the structure of a second oil-gas mixed output outlet pipe provided by the present invention; Figure 5 This is a schematic structural diagram of a third type of oil-gas mixed output outlet pipe provided by the present invention.

[0012] The reference numerals in the figures are as follows: 1-deepwater three-phase separation tank; 2-partition plate; 3-oil and gas mixed output pipe; 4-electric opening regulating valve; 5-one-way flow valve; 6-oil and gas transmission pipeline; 7-downstream processing device; 8-underwater centrifugal pump; 9-electric opening and closing valve; 10-water phase transmission pipeline; 11-formation; 12-pressure gauge; 13-liquid level gauge; 31-first main pipe; 32-opening; 33-first connecting piece; 41-second main pipe; 42-branch pipe; 43-second connecting piece; 51 - third main pipe; 52 - sawtooth bevel inlet; 53 - third connecting piece. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantages of the present invention clearer, the specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0014] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0015] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0016] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0017] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0018] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0019] The underwater three-phase separation device for oil and gas mixed transmission provided by the present invention comprises: a deepwater three-phase separation tank, which has an oil and gas mixing tank and a water tank inside; an oil and gas mixed output outlet pipe, which is arranged in the oil and gas mixing tank; an electric opening regulating valve and a one-way circulation valve, which are connected to the oil and gas mixed output outlet pipe, and the oil and gas mixed phase is output to the downstream processing device through the electric opening regulating valve and the one-way circulation valve; an underwater centrifugal pump and an electric opening and closing valve, which are connected to the water tank, and the water phase is injected back into the formation through the underwater centrifugal pump and the electric opening and closing valve; a pressure gauge, which is arranged in the oil and gas mixing tank and is electrically connected to the electric opening regulating valve; a liquid level gauge, which is arranged in the water tank and is electrically connected to the underwater centrifugal pump and the electric opening and closing valve. The present invention transports the separated oil and natural gas together, simplifies the structure, is suitable for deepwater underwater three-phase separation scenarios, improves the reliability of the underwater separation system, and realizes the automatic control of the waterway and the oil and gas mixed transmission route respectively through the liquid level control and pressure control logic.

[0020] The underwater three-phase separation device for oil-gas mixed transportation provided by the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0021] Example 1 See also Figure 1 , Figure 2 The present embodiment provides an underwater three-phase separation device for oil-gas mixed transmission, comprising: a deepwater three-phase separation tank 1, wherein a partition 2 is arranged inside the deepwater three-phase separation tank 1 to separate the inside into an oil-gas mixed tank and a water tank; an oil-gas mixed output outlet pipe 3, which is arranged in the oil-gas mixed tank of the deepwater three-phase separation tank 1 and is detachably connected to the tank bottom outlet; an electric opening regulating valve 4 and a one-way flow valve 5, which are connected to the oil-gas mixed output outlet pipe 3 through an oil-gas external transmission pipeline 6, and the oil-gas mixed phase is externally transmitted to a downstream processing device 7 through the electric opening regulating valve 4 and the one-way flow valve 5; an underwater centrifugal pump 8 and an electric on-off valve 9, which are connected to the deepwater three-phase separation tank 1 through a water phase external transmission pipeline 10. The water tank of the water three-phase separation tank 1 is connected, and the water phase is reinjected into the formation 11 through the underwater centrifugal pump 8 and the electric opening and closing valve 9; the pressure gauge 12 is arranged in the oil and gas mixing tank of the deepwater three-phase separation tank 1 and is electrically connected to the electric opening regulating valve 4, and is used to monitor the pressure in the oil and gas mixing tank and control the opening of the electric opening regulating valve 4, so as to realize the automatic pressure control (PC) of the oil and gas mixed transmission line; the liquid level gauge 13 is arranged in the water tank of the deepwater three-phase separation tank 1 and is electrically connected to the underwater centrifugal pump 8 and the electric opening and closing valve 9, and is used to monitor the liquid level in the water tank and control the opening and closing of the underwater centrifugal pump 8 and the electric opening and closing valve 9, so as to realize the automatic liquid level control (LC) of the waterway.

[0022] In the above embodiments, preferably, please refer to Figure 3 The oil-gas mixed output outlet pipe 3 uses a regular pipe section as the first main pipe 31 , a plurality of openings 32 are evenly arranged on the first main pipe 31 , and a first connecting piece 33 suitable for connecting to the deepwater three-phase separation tank 11 is formed at the lower end of the first main pipe 31 .

[0023] Alternatively, see Figure 4 The oil-gas mixed output outlet pipe 3 adopts a regular pipe section as the second main pipe 41. A branch pipe 42 connected to the second main pipe 41 is arranged on the wall of the second main pipe 41, and the inlet of the branch pipe 42 is arranged at a high point to introduce gas, and the liquid is replaced by gas injection. The lower end of the second main pipe 41 forms a second connecting piece 43 suitable for connecting to the deepwater three-phase separation tank 1.

[0024] Alternatively, see Figure 5The oil-gas mixed output outlet pipe 3 uses a regular pipe section as the third main pipe 51, the upper end of the third main pipe 51 is beveled to form a serrated treatment to form a serrated bevel inlet 52, and the lower end of the third main pipe 51 forms a third connecting piece 53 suitable for connecting to the deepwater three-phase separation tank 11. Among them, the serrated bevel inlet 52 can not only increase the fluid entry area, but also help to shear bubbles or oil droplets and promote oil-gas mixing.

[0025] In the above embodiment, preferably, the oil-gas mixed output outlet pipe 3 is arranged inside the deep-water three-phase separation tank 1, does not need to bear the pressure difference, and only plays the role of separating the flow.

[0026] In the above embodiment, preferably, the first connecting member 33, the second connecting member 43 and the third connecting member 53 can be connected to the deep-water three-phase separation tank 1 by means of threads or quick connections, so as to facilitate quick replacement and maintenance.

[0027] When the underwater three-phase separation device for oil and gas mixed transportation provided by the present invention is used, its implementation process is as follows: S100. Connect the oil-gas mixed output outlet pipe 3 to the bottom of the oil-gas mixed tank of the deepwater three-phase separation tank 1, and connect the oil-gas mixed output outlet pipe 3 to the oil-gas mixed transmission pipeline 6, the electric opening regulating valve 4 and the one-way flow valve 5; S200. Connect the water tank outlet of the deepwater three-phase separation tank 1 to the water phase transmission pipeline 10, the underwater centrifugal pump 8 and the electric opening and closing valve 9; S300. The opening of the electric opening regulating valve 4 is controlled by the pressure gauge 12 to realize the pressure control (PC) of the oil and gas mixed pipeline to ensure the separated oil and gas mixed phase is transported outward; S400. At the same time, the start and stop of the underwater centrifugal pump 8 and the electric on-off valve 9 are controlled by the liquid level meter 13 to realize automatic control of the liquid level of the waterway and ensure the external transmission of the separated water phase.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An underwater three-phase separation device for oil and gas mixed transportation, characterized in that: include: A deepwater three-phase separation tank, wherein a partition is provided inside the deepwater three-phase separation tank to separate the inside of the tank into an oil-gas mixing tank and a water tank; An oil-gas mixed output outlet pipe is arranged in the oil-gas mixing chamber of the deepwater three-phase separation tank and is detachably connected to the tank bottom outlet; The electric opening regulating valve and the one-way circulation valve are connected to the oil-gas mixed output outlet pipe through the oil-gas output pipeline, and the oil-gas mixed phase is output to the downstream processing device through the electric opening regulating valve and the one-way circulation valve; The underwater centrifugal pump and the electric on-off valve are connected to the water tank of the deepwater three-phase separation tank through the water phase transmission pipeline, and the water phase is injected back into the formation through the underwater centrifugal pump and the electric on-off valve; A pressure gauge, which is arranged in the oil-gas mixing chamber of the deepwater three-phase separation tank and is electrically connected to the electric opening regulating valve, is used to monitor the pressure in the oil-gas mixing chamber and control the opening of the electric opening regulating valve to realize automatic pressure control of the oil-gas mixed transmission line; The liquid level meter is arranged in the water tank of the deep-water three-phase separation tank and is electrically connected to the underwater centrifugal pump and the electric on-off valve. It is used to monitor the liquid level in the water tank and control the opening and closing of the underwater centrifugal pump and the electric on-off valve to realize automatic control of the liquid level in the waterway.

2. The underwater three-phase separation device according to claim 1, characterized in that: The oil-gas mixed output outlet pipe adopts a regular pipe section as the first main pipe, a plurality of openings are evenly arranged on the first main pipe, and the lower end of the first main pipe forms a first connecting piece suitable for connecting with the deepwater three-phase separation tank.

3. The underwater three-phase separation device according to claim 1, characterized in that: The oil-gas mixed output outlet pipe adopts a regular pipe section as the second main pipe, a branch pipe connected to the second main pipe is arranged on the wall of the second main pipe, and the inlet of the branch pipe is arranged at a high point to introduce gas, and the liquid is replaced by gas injection, and the lower end of the second main pipe forms a second connecting piece suitable for connecting to the deep-water three-phase separation tank.

4. The underwater three-phase separation device according to claim 1, characterized in that: The oil-gas mixed output outlet pipe adopts a regular pipe section as the third main pipe, the upper end of the third main pipe is beveled and serrated to form a serrated bevel inlet, and the lower end of the third main pipe forms a third connecting piece suitable for connecting to the deepwater three-phase separation tank.

5. The underwater three-phase separation device according to claim 2, 3 or 4, characterized in that: The first connecting piece, the second connecting piece and the third connecting piece can be connected to the deep-water three-phase separation tank by means of threads or quick connections.

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