Sealed, rapid and deep dehydration skid-mounted integrated device for oilfield produced liquid

Abstract

The utility model discloses a skid-mounted integrated device for closed, rapid and deep dehydration of oilfield produced liquid. The skid-mounted integrated device comprises an oilfield produced liquid rapid separation device and an oilfield produced liquid rapid demulsification and dehydration device which are connected with each other, the rapid separation device for the oilfield produced liquid comprises a tank body A, wherein a buffer plate, a metal coalescence filler, a first dehydration element A, a dehydration element B, an oil storage chamber and a water storage chamber are sequentially arranged in the tank body A; the rapid demulsification and dehydration device for the oilfield produced liquid comprises a tank body B, wherein an oil inlet distributor, a dehydration element C, an overflow plate and a second dehydration element A are arranged in the tank body B; the oil inlet distributor, the dehydration element C, the overflow plate and the second dehydration element A are connected in sequence; the oil well produced liquid is subjected to coalescence, separation, demulsification and dehydration, and it is guaranteed that the water content of dehydrated crude oil meets the water content index requirement that the crude oil enters a refinery company for 0.5%.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield produced liquid separation, in particular to a skid-mounted integrated device for closed rapid deep dehydration of oilfield produced liquid. Background Art

[0002] The produced fluid from oil wells mainly exists in a stable state of water-in-oil. With the advancement of crude oil production, the produced fluid gradually changes from a low water content of 30% to a high water content of 80%-90%. The stability of the produced fluid continues to increase, and the viscosity, strength and thickness of the oil-water interface film gradually increase. With long-term production operation, the water content of the produced fluid after separation by the three-phase separator is also gradually increasing, and the water content can even reach 50%. At present, the treatment of thin oil and heavy oil produced fluids is basically carried out by "thermochemical sedimentation + electrochemical dehydration" technology based on "two-stage sedimentation" and "two-stage heating". There are many problems in process, production and system construction: (1) The single-well production blocks of oilfield produced fluids are seriously decentralized, the process chain of the production area is not centralized, the production process is long, and continuous and repeated tank emptying is required during the production process; (2) The produced fluids from each single well in the well site are sent to the corresponding oil production station nearby. A series of measures such as heating, adding drugs to break emulsions, tank emptying, sedimentation, electrochemical dehydration, and metering are required to dehydrate the produced fluids to the oil collection index requirements of the joint station, and then they are transported to the oil production station by tank trucks. Further dehydration treatment is required in the joint station, and the production process is very complicated; (3) In view of the production and process requirements of produced fluid, it is urgently necessary to build a ground engineering pipeline to meet the requirements of centralized treatment of produced fluid and qualified external transmission; (4) In traditional technology and processes, there is not enough time and space for oil-water separation and dehydration after chemical demulsification. The operation consumes a large amount of demulsifier, steam and electricity, and the demulsifier loss is large. The dehydration time is long and can be as long as 26 hours or more; (5) In traditional technology and processes, the electric dehydrator requires the water content of the produced fluid to be less than 30%. However, it is difficult to achieve this due to the front-end process. High-water-content produced fluid is often difficult to demulsify due to the lack of voltage, and the electrodes in the electric dehydrator are seriously consumed. Utility Model Content

[0003] The utility model aims to provide a skid-mounted integrated device for closed rapid deep dehydration of oilfield produced fluid, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] A skid-mounted integrated device for enclosed rapid deep dehydration of oilfield produced fluid, characterized in that it comprises an oilfield produced fluid rapid separation device and an oilfield produced fluid rapid demulsification and dehydration device connected to each other;

[0006] The oilfield produced liquid rapid separation device comprises a tank body A, a liquid inlet pipe fitting is arranged at the side end of the tank body A, a buffer plate is arranged at a position near the liquid inlet pipe fitting inside the tank body A, and one end of the liquid inlet pipe fitting is connected to the buffer plate;

[0007] The inside of the tank body A is also provided with metal agglomeration filler, a first dehydration element A, a dehydration element B, an oil storage chamber and a water storage chamber in sequence along the side of the buffer plate away from the liquid inlet pipe fitting;

[0008] The oilfield produced liquid rapid demulsification and dehydration device comprises a tank body B, an upper oil tank inlet pipe fitting is arranged at the upper end of the tank body B; an oil inlet distributor is arranged in the tank body B at a position opposite to the upper oil tank inlet pipe fitting, and one end of the upper oil tank inlet pipe fitting is connected to the oil inlet distributor;

[0009] The tank body B is also provided with a dehydration element C, an overflow plate, and a second dehydration element A;

[0010] The oil inlet distributor, the dehydration element C, the overflow plate and the second dehydration element A are connected in sequence;

[0011] The top end of the second dehydration element A is connected to an oil collecting pipe, and the bottom end of the second dehydration element A is connected to a water collecting pipe.

[0012] Furthermore, the surfaces of the first dehydration element A and the second dehydration element A are provided with nipple structures.

[0013] Furthermore, the dehydration element B is a spatial network structure.

[0014] It can be seen from the above technical solutions that, compared with the prior art, the beneficial effects of the present invention are:

[0015] The utility model realizes the agglomeration, separation, demulsification and dehydration of the oil well produced fluid through the unique design structure and the mutual cooperation between the dehydration elements, ensuring that the water content of the crude oil after dehydration reaches the water content index requirement of 0.5% for entering the refining company. It meets the technical route of the ground engineering gathering and transportation process of the oil field company's oil area pipeline transportation digital construction, shortens the traditional joint station crude oil dehydration treatment process, improves the quality and efficiency of crude oil dehydration, and reduces the multiple energy consumption invested in the joint station crude oil dehydration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is the overall process layout diagram of the skid-mounted integrated device for enclosed rapid deep dehydration of oilfield produced fluid in the embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the oilfield produced fluid rapid separation device in the embodiment of the utility model;

[0019] Figure 3 It is a schematic structural diagram of a device for rapid demulsification and dehydration of oilfield produced fluid in an embodiment of the utility model.

[0020] Description of reference numerals:

[0021] 1. Oilfield produced liquid rapid separation device; 1-1. Tank body A; 1-2. Gas outlet pipe fittings; 1-3. Ventilation pipe; 1-4. Pressure transmitter interface pipe fittings; 1-5. Backwash outlet pipe fittings A; 1-6. Manhole A; 1-7. Backwash outlet pipe fittings B; 1-8. Safety valve interface pipe fittings; 1-9. Manhole B; 1-10. Buffer plate; 1-11. Liquid inlet pipe fittings; 1-12. Oil storage chamber; 1-13. Water storage chamber; 1-14. Weir plate; 1-15. Water outlet pipe fittings for lower tank; 1-16. Ventilation pipe fittings A; 1-17. Saddle A; 1-18, pipe fittings for the oil outlet of the lower tank; 1-19, pipe fittings for the auxiliary oil outlet; 1-20, dehydration element B; 1-21, water outlet pipe fitting A; 1-22, flushing port pipe fitting A; 1-23, flushing pipe A; 1-24, water outlet pipe fitting B; 1-25, metal agglomeration filler; 1-26, flushing pipe B; 1-27, water outlet pipe fitting C; 1-28, saddle B; 1-29, water outlet pipe fitting D; 1-30, flushing port pipe fitting B; 1-31, flushing port pipe fitting C; 1-32, flushing pipe C; 1-33, first dehydration element A;

[0022] 2. Rapid demulsification and dehydration device for oilfield produced liquid; 2-1. Tank body B; 2-2. Flushing port pipe fitting D; 2-3. Ventilation port pipe fitting B; 2-4. Upper tank oil inlet pipe fitting; 2-5. Manhole C; 2-6. Backwashing port pipe fitting C; 2-7. Pressure plate interface pipe fitting; 2-8. Pressure transmitter interface pipe fitting; 2-9. Oil outlet; 2-10. Flushing port pipe fitting E; 2-11. Oil collection pipe; 2-12. Second dehydration element A; 2-13, electric heater interface fittings; 2-14, dehydration element C; 2-15, oil inlet distributor; 2-16, flushing pipe F; 2-17, sewage outlet fittings A; 2-18, flushing outlet fittings F; 2-19, water outlet fittings E; 2-20, sewage outlet fittings B; 2-21, water outlet fittings F; 2-22, sewage outlet fittings C; 2-23, saddle C; 2-24, overflow plate; 2-25, water collecting pipe. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0028] See also Figure 1 As shown, the present embodiment provides a skid-mounted integrated device for closed rapid deep dehydration of oilfield produced fluid, comprising an oilfield produced fluid rapid separation device 1 and an oilfield produced fluid rapid demulsification and dehydration device 2 that are interconnected; the oil well produced fluid directly enters the oilfield produced fluid rapid separation device 1, and is agglomerated, separated, demulsified and dehydrated under the joint action of the oilfield produced fluid rapid separation device 1 and the oilfield produced fluid rapid demulsification and dehydration device 2, the oil well produced fluid rapid demulsification and dehydration device 2 outputs oil to an on-site purified oil tank, and the produced fluid rapid separation device 1 and the oilfield produced fluid rapid demulsification and dehydration device 2 separate the water and combine the water into the on-site produced water treatment system.

[0029] Specifically, if Figure 2The oilfield produced liquid rapid separation device 1 comprises a tank body A1-1, a liquid inlet pipe fitting 1-11 is arranged at the side end of the tank body A1-1, a buffer plate 1-10 is arranged near the liquid inlet pipe fitting 1-11 inside the tank body A1-1, and one end of the liquid inlet pipe fitting 1-11 is connected to the buffer plate 1-10;

[0030] The inside of the tank body A1-1 is also provided with metal agglomeration filler 1-25, first dehydration element A1-33, dehydration element B1-20, oil storage chamber 1-12 and water storage chamber 1-13 in sequence along the side of the buffer plate 1-10 away from the liquid inlet pipe 1-11;

[0031] It should be noted that if Figure 2 The tank body A1-1 is also provided with a gas outlet pipe fitting 1-2, a vent pipe 1-3, a pressure transmitter interface pipe fitting 1-4, a backwash port pipe fitting A1-5, a manhole A1-6, a backwash port pipe fitting B1-7, a safety valve interface pipe fitting 1-8, a manhole B1-9, a weir flow plate 1-14, a water outlet pipe fitting 1-15 to the lower tank, a vent pipe fitting A1-16, a saddle A1-17, an oil outlet pipe fitting 1-18 to the lower tank, an auxiliary oil discharge port pipe fitting 1-19, a water outlet pipe fitting A1-21, a flushing port pipe fitting A1-22, a flushing pipe A1-23, a water outlet pipe fitting B1-24, a flushing pipe B1-26, a water outlet pipe fitting C1-27, a saddle B1-28, a water outlet pipe fitting D1-29, a flushing port pipe fitting B1-30, a flushing port pipe fitting C1-31, and a flushing pipe C1-32.

[0032] Specifically, if Figure 3 The oilfield produced liquid rapid demulsification and dehydration device 2 comprises a tank body B2-1, an upper oil tank inlet pipe fitting 2-4 is arranged at the upper end of the tank body B2-1; an oil inlet distributor 2-15 is arranged at a position opposite to the upper oil tank inlet pipe fitting 2-4 in the tank body B2-1, and one end of the upper oil tank inlet pipe fitting 2-4 is connected to the oil inlet distributor 2-15;

[0033] The tank body B2-1 is also provided with a dehydration element C2-14, an overflow plate 2-24, and a second dehydration element A2-12;

[0034] The oil inlet distributor 2-15, the dehydration element C2-14, the overflow plate 2-24 and the second dehydration element A2-12 are connected in sequence;

[0035] The top end of the second dehydration element A2-12 is connected to the oil collection pipe 2-11, and the bottom end of the second dehydration element A2-12 is connected to the water collection pipe 2-25.

[0036] It should be noted that if Figure 2The tank body B2-1 is also provided with a flushing port pipe fitting D2-2, a vent pipe fitting B2-3, a manhole C2-5, a backwashing port pipe fitting C2-6, a pressure plate interface pipe fitting 2-7, a pressure transmitter interface pipe fitting 2-8, an oil outlet 2-9, a flushing port pipe fitting E2-10, an electric heater interface pipe fitting 2-13, a flushing pipe F2-16, a sewage outlet pipe fitting A2-17, a flushing port pipe fitting F2-18, a water outlet pipe fitting E2-19, a sewage outlet pipe fitting B2-20, a water outlet pipe fitting F2-21, a sewage outlet pipe fitting C2-22, and a saddle C2-23.

[0037] It should be noted that the surfaces of the first dehydration element A1-33 and the second dehydration element A2-12 are modified with a large number of papillary structures, which are high molecular organic materials with super oleophilic and hydrophobic properties after modification, and have low surface energy and relative roughness. After the mixture of crude oil, natural gas and water is rectified by the metal agglomeration filler 1-25, the oil and gas flow smoothly and the turbulence is eliminated. When flowing through the surface of the first dehydration element A1-33, the mixture is forced to continuously change its flow rate and direction due to the papillary particles on it. Under the combined action of collision agglomeration and wetting agglomeration, the oil droplets in the oil phase aggregate and grow to form large-sized oil droplets, and the water droplets coarsen and aggregate to form large-sized water droplets. Due to the difference in oil and water density, the water phase is separated from the oil phase under the action of gravity. The water phase goes down the process and enters the lower tank (oilfield produced liquid rapid demulsification and dehydration device 1) through each water outlet pipe fitting, and the oil phase goes up the process and continues to move to the rear of the tank body A1-1. The separated natural gas is discharged from the gas outlet after the droplets are captured by the on-site mist capture device. This process can completely separate the water-containing crude oil from the free water.

[0038] It should be noted that the dehydration element B1-20 is a material with a spatial network structure having strong hydrophilicity and oleophobicity after modification. When the water-containing crude oil contacts the material, the hydrophilic filaments in the spatial network structure will continuously capture water droplets in the water-containing crude oil. As the water droplets are continuously captured and increase in size, the water droplets aggregate. At the same time, when the water-containing crude oil passes through the dehydration element B1-20, the aggregated water droplets begin to collide to form a water film, which accelerates the speed of forming the water layer, and finally causes the water phase with a density greater than the oil phase to sink and enter the lower tank through each water outlet pipe fitting. This process can remove about 45-50% of the water in the crude oil.

[0039] It should be noted that the dehydration element C2-14 is a strong demulsifying material with high porosity, high selectivity, low density, stable mechanical properties and bidirectional super oleophilic and super hydrophilic properties. When the water-containing crude oil flows through the dehydration element C2-14, under a certain pressure, the water-containing crude oil preferentially contacts the super hydrophilic material due to "crowding". At this time, the oil phase can penetrate through the high-porosity dehydration element, while the water phase adheres to and accumulates with the hydrophilic material. Under the turbulent collision of the liquid, the aggregation and growth of water droplets are accelerated, and the penetration of oil droplets is accelerated. Under the cooperation of a certain temperature (about 20-30°C) provided by the electric heating device externally connected to the electric heater interface pipe 2-13, the stability of the oil-in-water emulsion is broken. Under the action of the liquid shear force, the water film formed on the surface of the dehydration element C2-14 sinks, thereby further removing about 5% of the water in the water-containing crude oil.

[0040] It should be noted that the contact angle of the strongly oleophilic and hydrophobic dehydrating material with oil is 2° to 5°, and the contact angle with water is greater than 150°; the contact angle of the strongly hydrophilic and oleophobic dehydrating material with water is 0°, and the contact angle with oil is greater than 150°.

[0041] It should be noted that the dehydration temperature of the device is 20-30°C, the dehydration time is 1h-2h, and the water content of the crude oil after dehydration is less than 0.5%, which meets the requirements of crude oil gathering and refining.

[0042] In the prior art, the first-stage dehydration temperature is 35-40°C, the second-stage dehydration temperature is 55-60°C, the first-stage dehydration demulsifier dosage is 50-60mg / L, the second-stage dehydration demulsifier dosage is 50-60mg / L, and the dehydration time is 26-35h; the dehydration temperature in this device is 20-30°C, and the dehydration time is 1-2h, which has the characteristics of low dehydration temperature and fast dehydration speed.

[0043] Specifically, the oilfield produced liquid collected from the pipelines of various oil wells directly enters the buffer plate 1-10 through the liquid inlet 1-11 of the oilfield produced liquid rapid separation device 1. After the impact force is offset, the incoming liquid contacts and rectifies with the metal agglomeration filler 1-25. After the oil and gas flow is stable and the turbulence is eliminated, the outgoing liquid contacts with the first dehydration element A1-33. Under the strong oleophilic and hydrophobic effects of the modified macromolecular organic material, the water droplets in the water phase of the water-containing crude oil coarsely aggregate and grow, and the oil droplets in the oil phase aggregate and form large-diameter oil droplets. Finally, the water droplets form water The oil droplets form an oil layer, and the low-water crude oil contacts the dehydration element B1-20. The modified material with a strong hydrophilic and oleophobic spatial mesh structure captures the small water droplets in the water-containing crude oil, causing the small water droplets to coalesce to form a water film. Under the action of gravity, the water phase is separated from the oil phase, and the water phase goes down the process and enters the lower tank through each water outlet. The oil phase goes up the process and continues to move to the rear of the tank. The separated natural gas is captured by the mist capture device and then discharged from the gas outlet. The separated oil enters the oil storage chamber 1-12, and the separated water enters the water storage chamber 1-13 through the weir flow plate 1-14. This process can completely separate the water-containing crude oil from the free water. The low-water crude oil treated by the oilfield produced liquid rapid separation device 1 enters the oil tank inlet pipe 1-4 on the oilfield produced liquid rapid demulsification and dehydration device 2, and is evenly arranged on the dehydration element C2-14 through the oil inlet distributor 2-15. Under the cooperation of a certain temperature (about 20-30°C) of the electric heating device, the water content of the crude oil after dehydration finally reaches the requirement of less than 0.5%, and enters the purification oil tank to meet the standard for oil delivery to the refinery. The separated water is mixed and transported through pipelines and transported to the produced water treatment station for sewage treatment.

[0044] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. At the same time, for those skilled in the art, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A skid-mounted integrated device for closed rapid deep dehydration of oilfield produced fluid, characterized in that: It includes an oilfield produced fluid rapid separation device and an oilfield produced fluid rapid demulsification and dehydration device which are connected to each other; The oilfield produced liquid rapid separation device comprises a tank body A, a liquid inlet pipe fitting is arranged at the side end of the tank body A, a buffer plate is arranged at a position near the liquid inlet pipe fitting inside the tank body A, and one end of the liquid inlet pipe fitting is connected to the buffer plate; The inside of the tank body A is also provided with metal agglomeration filler, a first dehydration element A, a dehydration element B, an oil storage chamber and a water storage chamber in sequence along the side of the buffer plate away from the liquid inlet pipe fitting; The oilfield produced liquid rapid demulsification and dehydration device comprises a tank body B, an upper oil tank inlet pipe fitting is arranged at the upper end of the tank body B; an oil inlet distributor is arranged in the tank body B at a position opposite to the upper oil tank inlet pipe fitting, and one end of the upper oil tank inlet pipe fitting is connected to the oil inlet distributor; The tank body B is also provided with a dehydration element C, an overflow plate, and a second dehydration element A; The oil inlet distributor, the dehydration element C, the overflow plate and the second dehydration element A are connected in sequence; The top end of the second dehydration element A is connected to an oil collecting pipe, and the bottom end of the second dehydration element A is connected to a water collecting pipe.

2. The skid-mounted integrated device for closed rapid deep dehydration of oilfield produced fluid according to claim 1, characterized in that: The surfaces of the first dehydration element A and the second dehydration element A are provided with nipple structures.

3. The skid-mounted integrated device for closed rapid deep dehydration of oilfield produced fluid according to claim 1, characterized in that: The dehydration element B is a spatial network structure.

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