Three-phase separation device

Abstract

The present invention relates to the field of natural gas mining and filtering equipment, and in particular to a three-phase separation device that can further improve the oil-water separation efficiency, comprising a sewage storage tank, a cyclone, a rectifier and a gas-liquid separation component that are arranged above the sewage storage tank and are connected in sequence, the cyclone, the rectifier and the gas-liquid separation component are all connected to the sewage storage tank through the sewage pipes at their bottoms, the cyclone is provided with an air inlet, and the gas-liquid separation component is provided with an air outlet. The present invention adopts a horizontal tank hump design, which greatly improves the oil-water separation efficiency, and is particularly suitable for natural gas filtration and purification treatment processes.

Description

Technical Field

[0001] The invention relates to the field of natural gas mining and filtering equipment, in particular to a three-phase separation device. Background Art

[0002] As my country's natural gas exploitation and oil field production continue to deepen, the problem of oil, gas and water mixing in some areas is becoming increasingly serious. In the process of natural gas exploitation and transportation, oil is contained in the gas, which causes great harm to the ground gathering and processing system, such as causing blockage and corrosion of downstream pipelines, ground separation equipment, and instruments. The oil-water mixture separated by the separation equipment is not conducive to recycling and processing, greatly increasing the workload of pipeline maintenance, endangering human health, and causing environmental pollution. In the oil field production process, the separation of oil, water and gas is a necessary process, which requires deep separation to separate the oil for refining and utilization.

[0003] The three-phase separator is mainly used in the gas testing process and sewage treatment process in the natural gas mining and transportation process. In the gas testing process, due to the unclear product composition, some areas need to use a three-phase separator to perform preliminary separation of oil, water and gas, and then classify and collect them for treatment. In the process of natural gas gathering and transportation, the three-phase separator is mainly used to separate the oil-water mixture and the entrained natural gas separated by other separators, and separate the oil, gas and water for classification and treatment.

[0004] Three-phase separators have been widely used in oilfield production. The three-phase separator can purify impurities in oil and water, greatly reducing the probability of impurities. It mainly solves the problem of water content in purified oil and excessive oil and impurities in sewage. The reduction of impurity content reduces the difficulty of subsequent work, reduces the process of oilfield production, shortens the cycle of oilfield production, reduces the burden on technical personnel, and saves the cost of oilfields. At the same time, the operating effect of the three-phase separator directly determines the quality of oilfield produced water, determines whether it meets national standards, and whether it can be reinjected. Deep water purification has always been a headache for technicians in the process of oilfield production. The working efficiency of the three-phase separator should be essentially improved to reduce the burden of deep water purification. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a three-phase separation device which can further improve the oil-water separation efficiency.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a three-phase separation device, including a sewage storage tank, including a cyclone, a rectifier and a gas-liquid separation component arranged above the sewage storage tank and connected in sequence, the cyclone, the rectifier and the gas-liquid separation component are all connected to the sewage storage tank through the sewage discharge pipes at their bottoms, the cyclone is provided with an air inlet, and the gas-liquid separation component is provided with an air outlet.

[0007] Furthermore, it includes an air storage tank, which is communicated with the air outlet of the gas-liquid separation component.

[0008] Furthermore, a buffer tank is provided between the gas storage tank and the gas outlet of the gas-liquid separation component.

[0009] Furthermore, a defoaming component is arranged in the rectifier.

[0010] Furthermore, it includes a fender arranged on the bottom wall of the sewage storage tank, wherein the fender divides the inner cavity of the sewage storage tank into a solid impurity storage cavity and an oil-water impurity storage cavity, and the sewage discharge pipe at the bottom of the cyclone is arranged above the solid impurity storage cavity.

[0011] Furthermore, the solid impurity storage chamber is connected to the outside through a sand flushing pipe, wherein a slag discharge port is provided at the bottom of the solid impurity storage chamber.

[0012] Furthermore, it includes an oil-water baffle arranged on the bottom wall of the sewage storage tank, and the oil-water baffle divides the oil-water impurity storage chamber into an oil storage chamber and a water storage chamber, wherein the sewage pipe at the bottom of the gas-liquid separation component is arranged above the water storage chamber, and the sewage pipe at the bottom of the rectifier is arranged above the oil storage chamber.

[0013] Furthermore, a glass plate level gauge is provided at the water storage chamber.

[0014] Furthermore, a liquid level gauge is provided on the outer wall of the water storage chamber.

[0015] Furthermore, an oil storage cavity discharge port is provided in the oil storage cavity, and an anti-swirl device is provided at the oil storage cavity discharge port.

[0016] The beneficial effects of the present invention are as follows: in actual use, the natural gas to be processed first enters the cyclone through the air inlet, and the cyclone is used to forcibly change the direction of the airflow to form a cyclone, and the different mechanical properties of materials of different densities, such as inertia, centrifugal force, gravity, etc., are used to perform a preliminary separation of solid and liquid impurities. Secondly, the natural gas enters the rectifier, which stabilizes the airflow and reduces the flow rate, while changing the direction of the airflow multiple times, and performing a secondary separation of solid and liquid impurities using the gravity, inertia and collision condensation principles of different media. Subsequently, the natural gas enters the gas-liquid separation component, which can efficiently supplement and finely separate the water and oil in the gas phase, and finally discharge it through the air outlet. The present invention adopts a horizontal tank hump design, which greatly improves the oil-water separation efficiency, and is particularly suitable for natural gas filtration and purification treatment processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2It is a schematic diagram of the pipeline transportation principle structure of the present invention.

[0019] Marked in the figure are: cyclone 1, rectifier 2, defoaming component 3, gas-liquid separation component 4, liquid level meter 5, glass plate liquid level meter 6, oil-water baffle 7, isolator 8, oil-water interface meter 9, anti-cyclone 10, mud baffle 11, sand flushing pipe 12, sewage storage tank 13, to empty 31, to downstream pipe network 32, to empty 33, to upstream pipe network 34, to flush water 35, to sewage pipeline 36, to oil collection pipeline 37, control cabinet input power supply 41, control cabinet output signal 42, control cabinet 43, gas storage tank 51, buffer tank 52. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 , Figure 2 The three-phase separation device shown includes a sewage storage tank 13, including a cyclone 1, a rectifier 2 and a gas-liquid separation component 4 which are arranged above the sewage storage tank 13 and are connected in sequence. The cyclone 1, the rectifier 2 and the gas-liquid separation component 4 are all connected to the sewage storage tank 13 through the sewage pipes at the bottom of each. The cyclone 1 is provided with an air inlet, and the gas-liquid separation component 4 is provided with an air outlet. In actual use, the three-phase separation device can be integrated into a skid for easy transportation and installation. The present invention improves the gas-liquid two-phase separation efficiency by constructing a horizontal tank hump design and realizing multi-stage separation, thereby improving the oil-water separation efficiency.

[0022] In actual use, in order to store the gas after filtering the essence, an additional gas storage tank 51 can be selected, and the gas storage tank 51 is connected to the gas outlet of the gas-liquid separation component 4. In order to reduce the impact of high-speed gas on the gas storage tank 51, a buffer tank 52 can be further provided between the gas storage tank 51 and the gas outlet of the gas-liquid separation component 4.

[0023] In order to eliminate the foam generated in the liquid phase when the fluids collide in the rectifier 2 and to achieve a deep aggregation and separation effect on small particles of oil, water and other substances in the gas phase, a defoaming component 3 is preferably provided in the rectifier 2 .

[0024] In order to make full use of the fast sedimentation characteristics of solid impurities, intercept solid impurities such as gravel in the liquid phase, and prevent the blockage of the sewage discharge pipeline, the following scheme can be selected: including a fender 11 arranged on the bottom wall of the sewage storage tank 13, wherein the fender 11 divides the inner cavity of the sewage storage tank 13 into a solid impurity storage cavity and an oil-water impurity storage cavity, and the sewage discharge pipe at the bottom of the cyclone 1 is arranged above the solid impurity storage cavity. Further, it is preferred that the solid impurity storage cavity is connected to the outside through a sand flushing pipe 12, wherein a slag discharge port is arranged at the bottom of the solid impurity storage cavity. The following scheme can also be preferred: including an oil-water baffle 7 arranged on the bottom wall of the sewage storage tank 13, wherein the oil-water baffle 7 divides the oil-water impurity storage cavity into an oil storage cavity and a water storage cavity, wherein the sewage discharge pipe at the bottom of the gas-liquid separation component 4 is arranged above the water storage cavity, and the sewage discharge pipe at the bottom of the rectifier 2 is arranged above the oil storage cavity.

[0025] In actual use, in order to observe the accumulated oil and water level, it is preferred that a glass plate level gauge 6 is provided at the water storage chamber. Based on the same concept, a level gauge 5 can be provided on the outer wall of the water storage chamber. In order to prevent the formation of a vortex when sewage is discharged and take away the upper layer of oil, an oil storage chamber discharge port is provided in the oil storage chamber, and an anti-vortex device 10 is provided at the oil storage chamber discharge port.

[0026] Combination Figure 1The cyclone 1 of the three-phase separation device forms a cyclone by forcibly changing the direction of the airflow, and uses the different mechanical properties of materials of different densities, such as inertia, centrifugal force, and gravity, to perform preliminary separation of solid and liquid impurities. The rectifier 2 stabilizes the airflow and reduces the flow rate. At the same time, it changes the direction of the airflow multiple times, and uses the gravity, inertia, and collision condensation principles of different media to perform secondary separation of solid and liquid impurities. The defoaming component 3 eliminates the foam generated by the liquid phase during the first and second level collisions, and at the same time plays a deep-level coalescence and separation role for small particles of oil, water, and other substances in the gas phase. The gas-liquid separation component 4 efficiently supplements and finely separates water and oil in the gas phase. The oil-water baffle 7 uses the different densities of oil and water to allow the oil to overflow the baffle for collection. The mud baffle 11 uses the fast sedimentation characteristics of solid impurities to intercept solid impurities such as gravel in the liquid phase to prevent blockage of sewage discharge pipelines. Among them, the cyclone 1, the rectifier 2, the defoaming component 3, and the gas-liquid separation component 4 are located at the peak of the sewage storage tank 13. The separated liquid phase and solid impurities are passed through the sewage pipe to the liquid surface below the surface. The peak design greatly increases the volume of the liquid phase volume cavity, allowing the liquid phase to have a longer residence time and improve the oil-water separation efficiency. The peaks all use detachable heads to facilitate the cleaning and replacement of internal components. In addition, the oil-water interface control is achieved through the liquid level gauge 5, the glass plate liquid level gauge 6, the isolator 8 and the oil-water interface meter 9. The oil-water interface meter 9 controls the oil-water interface through parameter setting to ensure the oil-water separation effect. The isolator 8 allows water to enter the isolator, and the oil is blocked outside the isolator, and the liquid level difference is formed by the different densities of oil and water. The glass plate liquid level gauge 6 can observe the oil-water liquid level and interface through the glass plate liquid level gauge to observe the separation efficiency. The liquid level meter 5 can directly detect the oil level and water level information in the isolator. By limiting the parameters, the liquid level in the isolator is controlled to be lower than the oil-water baffle plane, which supplements the high-level limiting function of the oil-water interface instrument to ensure the oil-water separation efficiency. The anti-cyclone device 10 prevents the formation of a cyclone when sewage is discharged and takes away the upper oil. The sand flushing pipe 12 is used to flush when blockage occurs during the sand discharge process. A hand hole can be set at the end of the sand flushing pipe 12, and the blockage can be cleared through the hand hole.

[0027] Combination Figure 2 All components of this device can be assembled into a skid to form a skid-mounted three-phase separation device. Figure 2The gas phase outlet pipeline, sewage discharge pipeline, and oil discharge outlet pipeline shown can all be equipped with flow meters to monitor the gas, water, and oil production in real time. Pipe filters are preferably set in front of the flow meters of the sewage discharge pipeline and the oil discharge outlet pipeline, thereby effectively extending the service life of the flow meter. The venting system preferably uses a safety valve and a bursting disc device in combination. When the safety valve fails, the bursting disc device will rupture to complete the venting and pressure relief work, and more effectively perform safety protection. It is preferred to add a sand discharge pipeline to the sewage pipeline, which can be used for sand discharge alone. At the same time, a sand flushing pipe can be used to flush and assist sand discharge during the sand discharge process. The control system of the device can also be automated. The system controls the discharge of oil and water according to the feedback information of the oil-water interface meter and the liquid level meter to ensure the continuous operation of the three-phase separation device. The system can be equipped with a pressure gauge, a thermometer, and a differential pressure gauge to monitor the working status of the system in real time. Preferably, the buffer tank 52 and the gas storage tank 51 are respectively equipped with a vent valve and a pressure gauge to monitor the working status of the instrument air in real time and ensure the safe operation of the instrument air system. It is preferred that bypasses are provided between the inlet and outlet, each sewage outlet, and oil outlet, so that the process can be switched according to the actual use conditions on site. A bypass is provided between the inlet and the flushing port, and the inlet medium can be connected to directly stir the gravel to assist in sand discharge.

[0028] Compared with the traditional device, the present invention improves the gas-liquid two-phase separation efficiency due to the multi-stage separation, thereby improving the oil-water separation efficiency. The technical advantages are very obvious and the market promotion prospects are very broad.

Claims

1. A three-phase separation device, comprising a sewage storage tank (13), characterized in that: The invention comprises a cyclone (1), a rectifier (2) and a gas-liquid separation component (4) which are arranged above a sewage storage tank (13) and are connected in sequence. The cyclone (1), the rectifier (2) and the gas-liquid separation component (4) are all connected to the sewage storage tank (13) through sewage discharge pipes at their bottoms. The cyclone (1) is provided with an air inlet, and the gas-liquid separation component (4) is provided with an air outlet. The three-phase separation device is integrally formed into a skid for easy transportation and installation.

2. The three-phase separation device according to claim 1, characterized in that: It comprises an air storage tank (51), wherein the air storage tank (51) is communicated with the air outlet of the air-liquid separation component (4).

3. The three-phase separation device according to claim 2, characterized in that: A buffer tank (52) is provided between the gas storage tank (51) and the gas outlet of the gas-liquid separation component (4).

4. The three-phase separation device according to claim 1, 2 or 3, characterized in that: A defoaming component (3) is arranged in the rectifier (2).

5. The three-phase separation device according to claim 1, 2 or 3, characterized in that: It comprises a fender (11) arranged on the bottom wall surface of a sewage storage tank (13), wherein the fender (11) divides the inner cavity of the sewage storage tank (13) into a solid impurity storage cavity and an oil-water impurity storage cavity, and the sewage discharge pipe at the bottom of the cyclone (1) is arranged above the solid impurity storage cavity.

6. The three-phase separation device according to claim 5, characterized in that: The solid impurity storage chamber is in communication with the outside world via a sand flushing pipe (12), wherein a slag discharge port is provided at the bottom of the solid impurity storage chamber.

7. The three-phase separation device according to claim 5, characterized in that: It comprises an oil-water baffle (7) arranged on the bottom wall of the sewage storage tank (13), wherein the oil-water baffle (7) divides the oil-water impurity storage chamber into an oil storage chamber and a water storage chamber, wherein the sewage discharge pipe at the bottom of the gas-liquid separation component (4) is arranged above the water storage chamber, and the sewage discharge pipe at the bottom of the rectifier (2) is arranged above the oil storage chamber.

8. The three-phase separation device according to claim 7, characterized in that: A glass plate liquid level gauge (6) is provided at the water storage chamber.

9. The three-phase separation device according to claim 7, characterized in that: A liquid level meter (5) is arranged on the outer wall surface of the water storage chamber.

10. The three-phase separation device according to claim 7, characterized in that: An oil storage cavity discharge port is arranged in the oil storage cavity, and an anti-swirl device (10) is arranged at the oil storage cavity discharge port.

Images