elevation separator

Abstract

The application discloses an elevation separator and relates to the technical field of oil-water separation.The elevation separator comprises a main separation tank, a gas collecting bag with a gas outlet pipe fixed to one end of the top of the gas collecting bag, which is arranged at one end of the top of the main separation tank, is connected with the main separation tank and jointly forms a separation space, wherein the gas collecting bag and the main separation tank are parallel to each other and form an elevation angle with the horizontal line, a pre-separator is arranged in the main separation tank and is coaxially and obliquely arranged in the main separation tank, the pre-separator is composed of a pre-separation pipe and a cyclone guide, two slits are respectively formed in the middle and the bottom of the pre-separation pipe, and the two slits are respectively used for discharging oil and water, and an input end of the cyclone guide is arranged at one end of the pre-separation pipe.The elevation separator combines the advantages of a horizontal separator and a vertical separator, can be used for rapidly separating oil, gas and water from high-water-content produced liquid of an oil field, and can economically and efficiently solve the problem of high water content in the middle and late stages of oil field development.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil-water separation, in particular to an elevation angle separator. BACKGROUND

[0002] At present, with the continuous production of oil fields, many new problems have appeared in the later stage of exploitation in many oil fields. The single well production of most oil wells not only gradually decreases, but also the water cut of single well produced liquid continuously increases, and most of the water cut is more than 90%, which makes the separation treatment pressure very large, and the separation cost continuously increases.

[0003] At present, the mainstream separator is still a conventional gravity sedimentation separator, mainly divided into horizontal and vertical two kinds, but the separation efficiency is usually not high, the land occupation area is large, the treatment capacity is mainly determined by the equipment size, and simply relying on increasing the equipment size and the number of equipment to solve the problem of high water content in the middle and late stage of oil field development is not economical and scientific, so it is particularly important to find a separator with large treatment capacity and high separation efficiency under the same cost. SUMMARY

[0004] The purpose of the present application is to provide an elevation angle separator to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: an elevation angle separator, comprising:

[0006] a main separation tank;

[0007] a gas collection bag with a gas outlet pipe fixed at one end, which is placed at one end of the top of the main separation tank, and is connected with the main separation tank and forms a separation space together, wherein the gas collection bag and the main separation tank are parallel to each other and form an elevation angle with the horizontal line;

[0008] a pre-separator is arranged in the main separation tank and is coaxially and obliquely installed with the main separation tank;

[0009] the pre-separator is composed of a pre-separation pipe and a cyclone guide;

[0010] two narrow slits are respectively opened in the middle and the bottom of the pre-separation pipe, and the two narrow slits are respectively used for oil and water outflow;

[0011] the input end of the cyclone guide is arranged at one end of the pre-separation pipe, and the other end of the pre-separation pipe is connected with the inside of the main separation tank;

[0012] an air pipe is fixedly inserted between the output end of the cyclone guide and the inside of the gas collection bag;

[0013] the gas outlet pipe, the gas collection bag, the air pipe, the cyclone guide and the pre-separation pipe are sequentially connected.

[0014] Further, a U-shaped heating tube is arranged in the form of penetrating at the bottom end position inside the main separation tank without interfering with the pre-separator.

[0015] The U-shaped heating tube is used to complete the step of heating only oil without heating water and reduce the viscosity of oil products.

[0016] Further, the U-shaped heating tube is made by welding a DN200 seamless steel pipe and a flange, and the outside of the U-shaped heating tube is covered with radiating fins.

[0017] Further, the angle range of the elevation angle is 9-15°.

[0018] Further, the low saddle and the high saddle are respectively fixed at the two ends of the bottom of the main separation tank, and the main separation tank is in an inclined state under the support of the low saddle and the high saddle.

[0019] The angle range formed between the main separation tank in the inclined state and the horizontal line is the same as the angle range of the elevation angle.

[0020] Further, a reflux pipe for communication is fixed between the separation tank and the gas collecting chamber.

[0021] The impact separation plate is fixed in the gas collecting chamber.

[0022] Further, the oil outlet pipe is fixed at the top of the end of the main separation tank where the high saddle is arranged, the water outlet pipe is fixed at the bottom of the other end of the main separation tank, and the oil outlet pipe, the main separation tank and the water outlet pipe are sequentially communicated.

[0023] Further, the mixed flow guide pipe for injecting oil-gas-water mixed medium is fixed at the bottom of the end of the main separation tank close to the oil outlet pipe, and one end of the flow guide pipe is communicated with the inside of the pre-separator.

[0024] Further, the oil-gas-water mixed medium forms strong cyclone after entering between the pre-separation pipe and the cyclone guide along the outer edge of the pre-separation pipe.

[0025] The cyclone centrifugal action of the strong cyclone makes the gas-liquid quickly separate, and the oil-gas-water mixed medium flows along the cyclone guide to the bottom of the pre-separation pipe.

[0026] The cyclone flows along the direction of the bottom of the pre-separation pipe, gradually slows down and disappears, and after the oil and water are preliminarily separated, they flow into the main separation pipe through the slits arranged on the pre-separation pipe.

[0027] Compared with the prior art, the beneficial effects of the present application are:

[0028] This elevation angle separator combines the advantages of horizontal and vertical separators, enabling it to rapidly separate oil, gas, and water in high-water-content produced fluids from oil fields. It can economically and efficiently solve the problem of high water content in the later stages of oil field development.

[0029] In addition, the clever arrangement of the heating tubes ensures that heat is only input into the oil to produce an effect, without being input into the water, thus avoiding water surging and heat waste. Heating the pre-separated oil can greatly increase the demulsification and separation effect, as well as reduce the viscosity of the oil, making it easier for subsequent pipeline transportation and processing. Attached Figure Description

[0030] Figure 1 This is a structural composition diagram of the present invention;

[0031] Figure 2 This is a schematic diagram illustrating the working principle of the present invention;

[0032] Figure 3 for Figure 2 Sectional view of AA;

[0033] Figure 4 This is an installation diagram of the heating element in this invention;

[0034] Figure 5 This is an unfolded diagram of the swirl guide of the present invention.

[0035] In the diagram: 1. Main separator; 2. Pre-separator; 3. Return pipe; 4. Gas collection manifold; 5. Impact separation plate; 6. Gas outlet pipe; 7. Vent pipe; 8. Oil outlet pipe; 9. Guide pipe; 10. Swirl guide; 11. Water outlet pipe; 12. Low saddle; 13. High saddle; 14. U-shaped heating tube. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] At present, the mainstream separator is still the conventional gravity settling separator, which is mainly divided into horizontal and vertical types. However, the separation efficiency is usually not high and the footprint is large. The processing capacity is mainly determined by the size of the equipment. Simply increasing the size and number of equipment to solve the problem of high water content in the middle and late stages of oilfield development is not economical or scientific. Therefore, it is particularly important to find a separator with a large processing capacity and high separation efficiency at the same cost.

[0038] Example 1

[0039] like Figure 1 - Figure 5 As shown, the present invention provides a technical solution: an elevation angle separator, which includes:

[0040] Main separator tank 1;

[0041] A gas collecting bag 4 with an outlet pipe 6 fixed at one end of its top is placed at one end of the top of the main separator tank 1. It is connected to the main separator tank 1 and together they form a separation space. The gas collecting bag 4 is parallel to the main separator tank 1 and forms an elevation angle with the horizontal line. A pre-separator 2 is installed inside the main separator tank 1 and is installed at an angle to the main separator tank 1.

[0042] The pre-separator 2 consists of a pre-separation tube and a cyclone guide 10;

[0043] The pre-separation tube has two narrow slits at the middle and bottom, which are used for the oil and water to flow out respectively.

[0044] The input end of the cyclone guide 10 is installed at one end of the pre-separation tube, and the other end of the pre-separation tube is connected to the inside of the main separation tank 1; a vent pipe 7 is inserted and fixed between the output end of the cyclone guide 10 and the inside of the gas collecting bag 4; wherein the gas outlet pipe 6, the gas collecting bag 4, the vent pipe 7, the cyclone guide 10 and the pre-separation tube are connected in sequence.

[0045] It should be noted that in actual use, the oil-gas-water mixture enters the equipment through the guide pipe 9 and is introduced to the top of the pre-separation pipe through a pipeline. The inlet pipe is perpendicular to the pre-separation pipe and enters tangentially along the outer edge of the pre-separation pipe. The inlet flow velocity is designed to be relatively high to create a strong vortex between the pre-separator 2 and the vortex guide 10. The centrifugal force of the vortex causes rapid gas-liquid separation. The oil-water mixture flows along the guide line on the vortex guide 10 towards the bottom of the pre-separation pipe, while the gas passes through the vent on the vortex guide 10 (see attached diagram). Figure 5 The circle shown in the image is the vent hole. The gas flows into the vent pipe 7 and then into the gas collecting bag 4. The gas entering the gas collecting bag 4 first hits the impact separation plate 5. The gas and liquid have different densities and momentum, so their turning ability after hitting the plate is also different. As a result, a small amount of fine liquid droplets remaining in the gas are separated and flow into the main separation pipe through the return pipe 3 at the bottom of the gas collecting bag 4. The gas then flows out through the gas outlet at the top of the gas collecting bag 4.

[0046] It should be added that this device combines the advantages of horizontal and vertical separators, enabling it to rapidly separate oil, gas and water in high-water-cut produced fluids from oil fields, thus economically and efficiently solving the problem of high water content in the later stages of oil field development.

[0047] Example 2

[0048] refer to Figure 4It is understood that in this application,

[0049] A U-shaped heating tube 14 that does not interfere with the pre-separator 2 is installed in a perforated manner at the bottom of the main separator 1.

[0050] The U-shaped heating element 14 is used to complete the step of heating only the oil without heating the water and to reduce the viscosity of the oil.

[0051] The U-shaped heating tube 14 is made of seamless steel pipe of DN200 and flange welded together. The exterior of the U-shaped heating tube 14 is covered with heat sinks.

[0052] It should be added that, in this application, the U-shaped heating tube 14 is either a fire tube of an external burner or a heat exchange tube of external heat transfer oil.

[0053] Furthermore, it should be noted that this application achieves the effect of heat input only into the oil through the ingenious arrangement of heating pipes, without inputting heat into the water to avoid water surge and heat waste. Heating the pre-separated oil can greatly increase the demulsification and separation effect, as well as reduce the viscosity of the oil to facilitate subsequent pipeline transportation and processing.

[0054] Furthermore, it should be emphasized that when using this device, it should be installed horizontally with holes made in the upper end cap of the main separator 1, immersed in the lower part of the oil area to achieve the best effect: heat is only transferred to the oil to generate an effect, and not transferred to the water to avoid water surging and heat waste.

[0055] In addition, heating the pre-separated oil can greatly increase the demulsification and separation effect, and reduce the viscosity of the oil to facilitate subsequent pipeline transportation and processing. The oil-water distribution in the main separator 1 is that the oil is in the upper layer and the water is in the lower layer. The closer to the top, the purer the oil, and the closer to the bottom, the purer the water. The oil after demulsification and gravity sedimentation separation flows out from the oil outlet set on the upper end of the main separator 1, while the water flows out from the water outlet at the bottom of the cylinder.

[0056] Example 3

[0057] In this application,

[0058] The elevation angle ranges from 9 to 15°.

[0059] It should be noted that in this application, the elevation angle is based on the multiphase flow Eulerian analysis method, combined with the Realizable k-ε turbulence model to numerically simulate the separation process of the mixed medium in the separator. When the elevation angle is 0... When the elevation angle changes by 12°, the oil-water separation efficiency gradually increases with the increase of the elevation angle; when the elevation angle is at 12°... When the temperature changes by 15°, the oil-water separation efficiency decreases significantly.

[0060] When the elevation angle is 12°, the oil-water separation efficiency reaches its optimal value, with a separation efficiency of 90.48%. The water phase volume content at the oil outlet is 3.7%, and the oil phase volume content at the water outlet is 0.95%.

[0061] As the elevation angle increases, the "dead zone" inside the separator is significantly reduced, and the oil-water interface fluctuates, but the fluctuation is relatively gentle. The isopleths of the oil-water interface are close to horizontal, which provides a strong guarantee for stable outflow at the outlet.

[0062] Example 4

[0063] refer to Figure 1 It is understood that in this application,

[0064] The bottom of the main separator tank 1 is fixed with a low saddle 12 and a high saddle 13 at both ends. The main separator tank 1 is tilted under the support of the low saddle 12 and the high saddle 13. The angle range between the main separator tank 1 and the horizontal line in the tilted state is the same as the angle range of the elevation angle.

[0065] Example 5

[0066] refer to Figure 1 and Figure 2 It is understood that in this application,

[0067] A return pipe 3 for connection is fixed between the separator and the gas collection tank 4, and an impact separation plate 5 is fixed inside the gas collection tank 4.

[0068] Example 6

[0069] refer to Figure 1 and Figure 2 It is also known that in this application,

[0070] The main separator 1 has an oil outlet pipe 8 fixed on the top of the end where the high saddle 13 is installed, and a water outlet pipe 11 fixed on the bottom of the other end of the main separator 1. The oil outlet pipe 8, the main separator 1 and the water outlet pipe 11 are connected in sequence. The main separator 1 has a mixing guide pipe 9 fixed on the bottom of the end near the oil outlet pipe 8 for injecting oil-gas-water mixed medium. One end of the guide pipe 9 is connected to the inside of the pre-separator 2.

[0071] It should be noted that in actual use, the oil-gas-water mixture enters the pre-separation tube and forms a strong vortex between the pre-separation tube and the vortex guide 10 along the outer edge of the pre-separation tube; the centrifugal effect of the strong vortex causes the gas and liquid to separate rapidly, and the oil-gas-water mixture flows along the vortex guide 10 to the bottom of the pre-separation tube.

[0072] The swirling flow moves along the bottom of the pre-separation tube, gradually slowing down and disappearing. After the initial separation of oil and water, they flow into the main separation tube through the slits set on the pre-separation tube.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An elevation angle separator, characterized in that, include: Main separator tank; A gas collecting bag with an outlet pipe fixed at one end is placed at one end of the top of the main separator tank. It is connected to the main separator tank and together they form a separation space. The gas collecting bag is parallel to the main separator tank and forms an elevation angle with the horizontal line. The main separator is equipped with a pre-separator that is installed at an angle and coaxial with the main separator. The pre-separator consists of a pre-separation tube and a cyclone guide; The pre-separation tube has two narrow slits at the middle and bottom, which are used for the oil and water to flow out respectively. The input end of the cyclone guide is installed at one end of the pre-separation tube, and the other end of the pre-separation tube is connected to the inside of the main separation tank. A vent pipe is inserted and fixed between the output end of the swirl guide and the interior of the gas collecting bag; The outlet pipe, gas collecting bag, vent pipe, cyclone guide and pre-separation pipe are connected in sequence; A U-shaped heating tube, which does not interfere with the pre-separator, is installed in a perforated manner at the bottom of the main separation tank. U-shaped heating elements are used to complete the step of heating only the oil without heating the water and to reduce the viscosity of the oil. The U-shaped heating tube is made of seamless steel pipe of DN200 and flange welded together, and heat dissipation fins are installed all over the outside of the U-shaped heating tube. The elevation angle ranges from 9 to 15°.

2. The elevation angle separator according to claim 1, characterized in that: The bottom of the main separator is fixed with a low saddle and a high saddle at both ends, and the main separator is tilted under the support of the low saddle and the high saddle. The angle range formed between the main separation tank and the horizontal line in the tilted state is the same as the angle range of the elevation angle.

3. The elevation angle separator according to claim 2, characterized in that: A reflux pipe is fixed between the separator and the gas collecting manifold for connection. An impact separation plate is fixed inside the gas collection bag.

4. The elevation angle separator according to claim 2, characterized in that: The main separator has an oil outlet pipe fixed to the top of one end where the high saddle is installed, and a water outlet pipe fixed to the bottom of the other end. The oil outlet pipe, the main separator, and the water outlet pipe are connected in sequence.

5. The elevation angle separator according to claim 1, characterized in that: The main separator has a mixing guide pipe fixed at the bottom near the oil outlet pipe for injecting oil-gas-water mixed medium. One end of the guide pipe is connected to the interior of the pre-separator.

6. The elevation angle separator according to claim 5, characterized in that: After the oil-gas-water mixture enters the pre-separation tube along its outer edge and forms a strong swirling flow between the pre-separation tube and the swirling guide, a strong swirling flow is formed. The centrifugal force of the strong swirling flow enables rapid gas-liquid separation, and the oil-gas-water mixed medium flows along the swirling guide towards the bottom of the pre-separation tube; The swirling flow moves along the bottom of the pre-separation pipe, gradually slows down and disappears, and after the initial separation of oil and water, they flow into the main separation tank through the slits set on the pre-separation pipe.

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