Three-phase separation heating device for low-temperature incoming liquid

Abstract

The invention belongs to the field of oil field ground process gathering and transportation equipment, and discloses a low-temperature incoming liquid three-phase separation heating device. The whole device is a tank body and comprises a gate valve, a collider, a buffer partition plate, a liquid inlet pipe, a heating device, a gas-liquid separation device, an oil-water interface instrument, a mist catcher, a gas outlet pipe, a liquid level regulator, a high-low liquid level alarm, a longitudinal partition plate, a floating ball liquid level meter a, an oil outlet pipe I, a water outlet pipe, an oil outlet pipe II, a water feeding pipe, a transverse partition plate, a floating ball liquid level meter b, an electric valve and an oil well pump. The requirement of the normal-temperature gathering and transportation process for equipment can be met, technical support is provided for effective implementation of the process, and the gathering and transportation system can achieve the purposes of energy conservation and consumption reduction as a whole.

Description

Technical Field

[0001] The invention belongs to the field of oilfield surface process gathering and transportation equipment, and in particular relates to a low-temperature liquid three-phase separation and heating device. Background Art

[0002] The three-phase separator is a commonly used oil, gas and water separation equipment in oil fields. It is an important intermediate link connecting oil wells and the external transportation of dehydrated crude oil.

[0003] As the oil field enters the final stage of development, the water content in the produced fluid is gradually increasing, which makes the energy consumption of the ground gathering and transportation system using the blending process gradually increase. In order to reduce the energy consumption of the gathering and transportation system, the low-temperature cold transportation process is gradually promoted and applied. In order to achieve the whole process of low-temperature cold transportation, the low-temperature incoming liquid needs to remove the gas and free water in the incoming liquid without heating, and then remove the emulsified water.

[0004] In the past, a three-phase separator was generally used to separate the oil, gas and water from the incoming liquid. This equipment requires the oil-water mixed incoming liquid to be heated to 40-50°C before the oil, gas and water three-phase separation can be performed. Since the incoming liquid contains a relatively high amount of water, a large amount of heat energy is absorbed by the water during the heating process. However, in production requirements, it is only necessary to heat the oil to 40-50°C, while the water does not need to reach such a high temperature, which results in energy loss. The higher the water content of the incoming liquid, the greater the energy consumption. Therefore, in order to reduce the energy consumption of the gathering and transportation system, a device that can separate the oil, gas and water from the low-temperature incoming liquid without heating is required in the low-temperature cold transportation process to ensure the implementation of this process. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a low-temperature liquid three-phase separation and heating device, which solves the problem of separating the low-temperature liquid outside the station into oil, gas and water three-phases without heating in the normal temperature gathering and transportation process, and realizes the single-phase heating of the separated crude oil to above the freezing point for external transmission, and the separated sewage is not heated or is heated less, thereby meeting the requirements of the low-temperature cold transportation process and ensuring that the process achieves the purpose of overall energy saving and consumption reduction.

[0006] The above-mentioned object of the present invention is achieved through the following technical scheme: a low-temperature liquid three-phase separation and heating device, the device as a whole is a horizontal tank body, the device includes a gate valve, a collision device, a buffer partition, a liquid inlet pipe, a heating device, a gas-liquid separation device, an oil-water interface meter, a mist collector, an air outlet pipe, a liquid level regulator, a high and low liquid level alarm, a longitudinal partition, a float liquid level gauge a, an oil outlet pipe I, a water outlet pipe, an oil outlet pipe II, a water supply pipe, a transverse partition, and a float liquid level gauge b; the tank body is divided into four chambers by the buffer partition, the transverse partition, and the longitudinal partition, wherein the buffer partition and the tank body are provided with a primary separation chamber, the buffer partition and the transverse partition are provided with a sedimentation separation heating chamber, the transverse partition and the longitudinal partition are provided with a water collecting chamber and an oil collecting chamber in parallel, and the bottom of the primary separation chamber is connected to the sedimentation separation heating chamber; a collision device and a liquid inlet pipe outlet are provided in the primary separation chamber, the liquid inlet pipe passes through the sedimentation separation heating chamber, the oil collecting chamber and the head and is connected to the system liquid inlet pipeline, and the sedimentation separation heating chamber is provided with a buffer partition, a buffer partition and a transverse partition are provided with a transverse partition and a longitudinal partition, and the bottom of the primary separation chamber is connected to the sedimentation separation heating chamber. A gas-liquid separation device, an oil-water interface meter and a mist collector are arranged on the top of the separation and heating chamber, a heating device and a float level gauge b are arranged in the middle, the heating device is located between the buffer baffle and the gas-liquid separation device, and is connected to the outside of the tank body through a pipeline. A gate valve is arranged at the end of the pipeline leading to the outside of the tank body, and an air outlet pipe is also arranged on the mist collector. A water supply pipe, a water outlet pipe and a liquid level regulator are arranged in the water collecting chamber, an oil outlet pipe I and an oil outlet pipe II are arranged in the oil collecting chamber, the oil outlet pipe I is arranged on the rear end head of the tank body, the oil outlet pipe II is arranged at the bottom of the tank body, the oil collecting chamber and the water collecting chamber are both provided with high and low liquid level alarms and a float level gauge a, an electric valve II is arranged on the external pipe line of the water outlet pipe, the electric valve II is interlocked with the water collecting chamber level gauge, the outlet of the electric valve II is connected to the sewage system, the external pipe line of the oil outlet pipe I is provided with an electric valve I, the electric valve I is interlocked with the oil collecting chamber level gauge, the outlet of the electric valve I is connected to the dehydration system, the external pipe line of the oil outlet pipe II is provided with an oil pump, and the outlet of the oil pump is connected to the heating furnace.

[0007] Furthermore, the float level gauge has a remote transmission function.

[0008] Furthermore, the gas outlet pipe in the low-temperature liquid three-phase separation heating device is connected to the fuel gas system.

[0009] Furthermore, the gate valve outlet in the low-temperature liquid three-phase separation and heating device is connected to the heated hot oil pipeline.

[0010] Furthermore, the inlet of the liquid inlet pipe in the low-temperature liquid three-phase separation and heating device is connected to the low-temperature liquid.

[0011] Furthermore, the heating device in the low-temperature liquid three-phase separation heating device is composed of 3 groups of independent heaters, which are arranged in a stepped manner with gradually decreasing heights. The interval height of each group of heaters is 200mm, and the top of the heating device is 100mm from the oil level. Each group of heaters is composed of 4 distribution pipes, 1 manifold, and an oil inlet pipe; the 4 distribution pipes are evenly distributed on both sides of the manifold, and each distribution pipe is parallel to the radial direction of the cylinder; each distribution pipe has Φ10mm holes on both sides in the horizontal direction, from near to far, with equal diameters and unequal distances, and the Φ10mm holes on both sides are staggered; the Φ10mm holes on the two distribution pipes on the same side of the manifold are staggered.

[0012] The beneficial effects of the present invention compared with the prior art are:

[0013] 1. Compared with the prior art, the low-temperature liquid in the present invention does not need to be heated and directly enters the equipment for oil, gas and water separation. The partially separated crude oil is heated by a heating furnace through a single-phase heating device installed at the top of the sedimentation chamber, and then mixed back into the equipment, where it is mixed with the cold oil at the top in the form of a jet to heat the cold oil, while the sewage at the bottom is not heated. This can heat the oil layer, improve the oil-water separation efficiency, and achieve single-phase heating of the oil layer; at the same time, the circulating oil is allowed to settle twice, improving the oil separation index.

[0014] 2. After being treated by the equipment, the oil temperature at the oil outlet is higher than the freezing point of crude oil (35°C), the water content in the oil is ≤30%, the water temperature at the sewage outlet is not higher than the incoming liquid temperature by 5°C, and the oil content in the water is ≤1000mg / L.

[0015] 3. The present invention can meet the equipment requirements of the low-temperature cold transportation process, provide technical support for the effective implementation of the process, and enable the overall gathering and transportation system to achieve the goal of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] Figure 1 It is a schematic structural diagram of the low-temperature liquid three-phase separation and heating device of the present invention;

[0018] Figure 2 It is a schematic diagram of the external piping of the low-temperature liquid three-phase separation and heating device of the present invention;

[0019] Figure 3 It is a structural diagram of the heating device in the low-temperature liquid three-phase separation heating device of the present invention.

[0020] In the figure, 1, gate valve; 2, impactor; 3, buffer partition; 4, liquid inlet pipe; 5, heating device; 6, gas-liquid separation device; 7, oil-water interface meter; 8, mist collector; 9, air outlet pipe; 10, liquid level regulator; 11, high and low liquid level alarm; 12, longitudinal partition; 13, float level gauge a; 14, oil outlet pipe I; 15, water outlet pipe; 16, oil outlet pipe II; 17, water supply pipe; 18, transverse partition; 19, float level gauge b; 20, electric valve I; 21, electric valve II; 22, oil pump; 23, distribution pipe; 24, manifold; 25, oil inlet pipe. DETAILED DESCRIPTION

[0021] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0022] Example 1

[0023] A low-temperature liquid three-phase separation and heating device, the device as a whole is a tank body, the device includes a gate valve 1, a collision device 2, a buffer partition 3, a liquid inlet pipe 4, a heating device 5, a gas-liquid separation device 6, an oil-water interface meter 7, a mist collector 8, an air outlet pipe 9, a liquid level regulator 10, a high and low liquid level alarm 11, a longitudinal partition 12, a float liquid level gauge a13, an oil outlet pipe I14, a water outlet pipe 15, an oil outlet pipe II16, a water supply pipe 17, a transverse partition 18, and a float liquid level gauge b19; the tank body is divided into four chambers by the buffer partition 3, the transverse partition 18, and the longitudinal partition 12, wherein the space between the buffer partition 3 and the tank body is a primary separation chamber The buffer partition 3 and the transverse partition 18 are the sedimentation separation heating chamber, the transverse partition 18 and the longitudinal partition 12 are parallel as the water collection chamber and the oil collection chamber, and the bottom of the initial separation chamber is connected to the sedimentation separation heating chamber; the initial separation chamber is provided with a collision device 2 and a left port of the liquid inlet pipe 4, the main body of the liquid inlet pipe 4 is located in the sedimentation separation heating chamber, the right port of the liquid inlet pipe 4 intersects with the transverse partition 18 and is connected to the tank body, and is connected to the outside world through the channel on the tank body, and the top of the sedimentation separation heating chamber is provided with a gas-liquid separation device 6, an oil-water interface meter 7, and a mist collector 8, and a heating device 5 and a float liquid level gauge b19 are provided in the middle, and the heating device 5 is located between the buffer partition 3 and the gas-liquid The separation device 6 is connected to the outside of the tank body through a pipeline, and a gate valve 1 is provided at the port of the pipeline leading to the outside of the tank body. The mist collector 8 is also provided with an air outlet pipe 9, and the water collecting chamber is provided with a water supply pipe 17, a water outlet pipe 15, and a liquid level regulator 10. The oil collecting chamber is provided with an oil outlet pipe I 14 and an oil outlet pipe II 16. The oil outlet pipe I 14 is arranged on the rear end head of the tank body, and the oil outlet pipe II 16 is arranged at the bottom of the tank body. The oil collecting chamber and the water collecting chamber are both provided with a high and low liquid level alarm 11 and a float liquid level gauge 13; the float liquid level gauge has a remote transmission function; the water outlet pipe 15 is provided with an electric valve II 21 on the external pipe line, and the outlet of the electric valve II 21 is connected to the sewage system, electric valve II is interlocked with the float level gauge of the water collecting chamber, and the water flow rate is automatically controlled according to the liquid level height of the water collecting chamber; an electric valve I20 is arranged on the external pipe line of the oil outlet pipe I14, and the outlet of the electric valve I20 is connected to the dehydration system, and the electric valve I is interlocked with the float level gauge of the oil collecting chamber, and the oil output is automatically controlled according to the liquid level height of the oil collecting chamber; an oil pump 22 is arranged on the external pipe line of the oil outlet pipe II16, and the outlet of the oil pump 22 is connected to the heating furnace; the air outlet pipe 9 is connected to the fuel gas system; the outlet of the gate valve 1 is connected to the heated hot oil pipeline; the right end of the liquid inlet pipe in the low-temperature liquid three-phase separation heating device is connected to the low-temperature liquid.

[0024] The settling chamber heating device is divided into 3 groups and each group is independent. The 3 groups of heating devices 5 are arranged in a stepped and segmented manner. A gate valve 1 is provided at the front end of the inlet of each group of heating devices 5, and the inlet pipeline of the heating device 5 is connected to the outlet of the heating furnace. The heating device 6 is composed of 4 distribution pipes, 1 manifold, and an oil inlet pipe. The 4 distribution pipes are evenly distributed on both sides of the manifold, and each distribution pipe is parallel to the radial direction of the cylinder. Each distribution pipe has Φ10mm holes on both sides in the horizontal direction, from near to far, with equal diameters and unequal distances, and the Φ10mm holes on both sides are staggered. The Φ10mm holes on the two distribution pipes on the same side of the manifold are staggered.

[0025] A collision device 2 is arranged at the top of the front end of the equipment, and a buffer baffle 3 is arranged at the front end of the kinetic energy absorber. The top of the buffer baffle 3 is a vertical plate, and the bottom extends obliquely downward to the bottom of the oil-water mixed layer, so that the separated low-temperature mixed liquid can flow smoothly into the liquid phase area and reduce the impact on the oil layer.

[0026] Two groups of gas-liquid separation devices 6 are arranged in the gas phase area at the top of the equipment, and a mist collector 8 is arranged at the top of the rear end to purify the gas after the initial separation.

[0027] An oil-water interface regulator is arranged in the water collecting chamber to adjust the oil-water interface in the settling and separation chamber according to the oil-water interface meter 7 at the top of the settling chamber and the oil-water separation index.

[0028] An oil outlet pipe 14 is arranged in the oil collecting chamber and connected to the dehydration system of the rear section; an oil outlet pipe 16 is arranged at the bottom and connected to the heating furnace of the rear section.

[0029] A heating device 5 is arranged in the middle of the sedimentation separation heating chamber, between the buffer partition and the gas-liquid separation device. The heating device 5 is composed of 3 groups of independent heaters, which are arranged in a stepped manner with gradually decreasing heights. The interval height of each group of heaters is 200mm, and the top of the heating device is 100mm away from the oil level. The heater is composed of 4 distribution pipes 23, 1 manifold 24, and an oil inlet pipe 25. The 4 distribution pipes 23 are evenly distributed on both sides of the manifold 24, and each distribution pipe 23 is parallel to the radial direction of the cylinder. Each distribution pipe 23 has Φ10mm holes on both sides in the horizontal direction, from near to far, with equal diameters and unequal distances, and the Φ10mm holes on both sides are staggered. The Φ10mm holes on the two distribution pipes 23 on the same side of the manifold 24 are staggered, so that the hot oil can be fully exchanged with the cold oil in the sedimentation separation heating chamber.

[0030] The working principle of the equipment is that the incoming liquid collides with the kinetic energy absorber to perform initial gas-liquid separation, and the separated gas enters the gas system after passing through the gas-liquid separation element and the mist capture device. The separated liquid flows into the liquid phase area through the buffer plate, and is settled and separated in the oil-water sedimentation separation chamber. The separated oily sewage enters the water collection chamber through the oil-water interface regulator and then enters the sewage system. The separated low-water oil enters the oil collection chamber, and then a part enters the system, and the other part is heated by the heating furnace and then returned to the equipment, mixed with the cold oil separated in the equipment, and heated for cold oil. During the heating process, according to the water content of the incoming liquid, the hot oil flow in each group of heaters can be adjusted individually through the gate valve at the inlet end of the heater.

[0031] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A low-temperature liquid three-phase separation and heating device, characterized in that: The device is a horizontal tank body, and includes a gate valve (1), a collision device (2), a buffer partition (3), a liquid inlet pipe (4), a heating device (5), a gas-liquid separation device (6), an oil-water interface meter (7), a mist collector (8), an air outlet pipe (9), a liquid level regulator (10), a high and low liquid level alarm (11), a longitudinal partition (12), a float liquid level gauge a (13), an oil outlet pipe I (14), a water outlet pipe (15), an oil outlet pipe II (16), a water supply pipe ( 17), transverse partition (18), float liquid level gauge b (19); the tank body is divided into four chambers by the buffer partition (3), the transverse partition (18), and the longitudinal partition (12), wherein the space between the buffer partition (3) and the tank body is the initial separation chamber, the space between the buffer partition (3) and the transverse partition (18) is the sedimentation separation heating chamber, the space between the transverse partition (18) and the longitudinal partition (12) is the water collection chamber and the oil collection chamber, and the bottom of the initial separation chamber is connected to the sedimentation separation heating chamber; the initial separation chamber The impactor (2) and the outlet of the liquid inlet pipe (4) are provided in the middle. The liquid inlet pipe (4) passes through the sedimentation separation heating chamber, the oil collecting chamber and passes through the head to be connected with the system liquid inlet pipeline. The top of the sedimentation separation heating chamber is provided with a gas-liquid separation device (6), an oil-water interface meter (7) and a mist collector (8). The middle is provided with a heating device (5) and a floating ball liquid level gauge b (19). The heating device (5) is located between the buffer partition (3) and the gas-liquid separation device (6) and leads to the outside of the tank through a pipeline and to the tank. A gate valve (1) is provided at the port of the extracorporeal pipeline, an air outlet pipe (9) is also provided on the mist collector (8), a water supply pipe (17), a water outlet pipe (15) and a liquid level regulator (10) are provided in the water collecting chamber, an oil outlet pipe I (14) and an oil outlet pipe II (16) are provided in the oil collecting chamber, the oil outlet pipe I (14) is provided on the rear end cover of the tank body, and the oil outlet pipe II (16) is provided at the bottom of the tank body, and both the oil collecting chamber and the water collecting chamber are provided with high and low liquid level alarms (11) and a float liquid level gauge a (13).

2. The low-temperature liquid three-phase separation and heating device according to claim 1, characterized in that: The heating device is composed of three groups of independent heaters, which are arranged in a stepped manner with gradually decreasing heights. The interval height between each group of heaters is 200 mm, and the top of the heating device is 100 mm from the oil level. Each group of heaters is composed of four distribution pipes (23), one manifold (24), and an oil inlet pipe (25). The four distribution pipes (23) are evenly distributed on both sides of the manifold (24), and each distribution pipe (23) is parallel to the radial direction of the cylinder. Each distribution pipe (23) is provided with Φ10 mm holes on both sides in a horizontal direction from near to far with equal diameters and unequal distances, and the Φ10 mm holes on both sides are staggered. The Φ10 mm holes on the two distribution pipes (23) on the same side of the manifold (24) are staggered.

3. The low-temperature liquid three-phase separation and heating device according to claim 1, characterized in that: The float liquid level gauge has a remote transmission function.

4. The low-temperature liquid three-phase separation and heating device according to claim 1, characterized in that: An electric valve II (21) is arranged on the external pipe line of the water outlet pipe (15), the electric valve II (21) is interlocked with the water collecting chamber liquid level gauge, and the outlet of the electric valve II (21) is connected to the sewage system.

5. The low-temperature liquid three-phase separation and heating device according to claim 1, characterized in that: An electric valve I (20) is arranged on the external pipe line of the oil outlet pipe I (14), the electric valve I (20) is interlocked with the oil collecting chamber liquid level gauge, and the outlet of the electric valve I (20) is connected to the dehydration system.

6. The low-temperature liquid three-phase separation and heating device according to claim 1, characterized in that: An oil pump (22) is arranged on the external pipe line of the oil outlet pipe II (16), and the outlet of the oil pump (22) is connected to the heating furnace.

7. The low-temperature liquid three-phase separation and heating device according to claim 1, characterized in that: The gas outlet pipe (9) is connected to the fuel gas system.

8. The low-temperature liquid three-phase separation and heating device according to claim 1, characterized in that: The outlet of the gate valve (1) is connected to the heated hot oil pipeline.

9. The low-temperature liquid three-phase separation and heating device according to claim 1, characterized in that: The inlet of the liquid inlet pipe is connected to low-temperature liquid.

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