Oil sand separation system and separation method

Abstract

The invention discloses an oil sand separation system and a separation method, which belongs to the field of oil and gas acquisition, development and processing, and comprises an oil sand static pressure buffer container connected to an oil well outlet pipe, a first clean oil outlet pipe is arranged above the oil sand static pressure buffer container, and a heating pipeline is connected to the bottom of the oil sand static pressure buffer container; a centrifugal separation container is connected to the outlet of the heating pipeline, a second clean oil outlet pipe is connected to the center of the top of the centrifugal separation container, and an inclined atomization filter container is connected to the bottom of the centrifugal separation container through a pipeline; a feed inlet of the atomization filter container is arranged at the bottom, and a discharge port of the atomization filter container is arranged at the top and connected to a third clean oil outlet pipe; an atomization chamber is arranged in the atomization filter container, a plurality of atomization axial small holes are arranged near the feed inlet of the atomization chamber, a filter screen is arranged near the discharge port of the atomization chamber, and a sand particle collection outlet is arranged at the bottom of the inclined atomization chamber. The invention can ensure that the sand content of the oil liquid produced in the end is extremely low, and the oil content in the separated sand is also extremely low.

Description

Technical Field

[0001] The invention relates to the field of oil and gas collection, development and processing, and in particular to an oil sand separation system and a separation method. Background Art

[0002] Due to the complexity of the formation and underground construction operations, some production wells that have taken sand prevention measures still have sand production, and the fine sand enters the crude oil processing pipeline directly from the crude oil inlet. These fine sands enter the ground gathering and transportation system. If they are not removed in time, they will cause a series of problems such as wear of equipment such as pumps, damage to metering instruments, blockage of oil pipeline valves, and reduced equipment processing capacity.

[0003] In addition, if the oil-containing fine sand is discharged directly without treatment, it will not only cause a huge waste of energy because the oil contained in the sand cannot be recovered, but also pollute the environment.

[0004] In view of the above problems, the present invention designs and manufactures an oil sand separation system and a separation method to overcome the above defects. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an oil sand separation system and separation method, which can ensure that the sand content in the final produced oil is extremely low, and the oil content in the separated sand is also extremely low.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an oil sand separation system comprises an oil sand static pressure buffer container, the oil sand static pressure buffer container is connected to the well oil pipe, a first clean oil outlet pipe is arranged above the oil sand static pressure buffer container, and a heating pipeline is connected to the bottom of the oil sand static pressure buffer container;

[0007] The outlet of the heating pipeline is connected to a centrifugal separation container, the top center of the centrifugal separation container is connected to a second clean oil outlet pipe, and the bottom of the centrifugal separation container is connected to an inclined atomization filter container through a pipeline;

[0008] The feed inlet of the atomizing filter container is arranged at the bottom, and the discharge port of the atomizing filter container is arranged at the top and is connected to a third clean oil outlet pipe;

[0009] An atomizing chamber is provided in the atomizing filter container, a plurality of atomizing axial small holes are provided in the atomizing chamber near the feed inlet, a filter screen is provided in the atomizing chamber near the discharge outlet, and a sand collecting outlet is provided at the inclined bottom of the atomizing chamber.

[0010] Preferably, the radial cross-sectional area of ​​the oil sand static pressure buffer container is much larger than the radial cross-sectional area of ​​the oil pipe out of the well;

[0011] And / or, the radial cross-sectional area of ​​the oil sand static pressure buffer container is at least ten times greater than the radial cross-sectional area of ​​the oil pipe out of the well.

[0012] Preferably, a core shaft is provided inside the oil sand static pressure buffer container.

[0013] Preferably, at least one centrifugal separation container is provided, and a plurality of the centrifugal separation containers are connected to the outlet of the heating pipeline through a distributor.

[0014] Preferably, the oil outlet of the wellbore oil pipe is located below the oil inlet of the first clean oil outlet pipe.

[0015] Preferably, the sand collection outlet is connected to a sand collection and squeezing box via a pipeline.

[0016] Preferably, the outlets of the first clean oil outlet pipe, the second clean oil outlet pipe and the third clean oil outlet pipe are connected to a main clean oil outlet pipe;

[0017] The radial cross-sectional area of ​​the first clean oil outlet pipe is smaller than the radial cross-sectional area of ​​the outlet pipe;

[0018] The radial cross-sectional area of ​​the second clean oil outlet pipe is smaller than the radial cross-sectional area of ​​the heating pipeline;

[0019] The radial cross-sectional area of ​​the third clean oil outlet pipe is smaller than the size of the feed port of the atomizing filter container.

[0020] Preferably, the radial cross-sectional area of ​​the heating pipeline is larger than the radial cross-sectional area of ​​the oil pipe out of the well;

[0021] The size of the discharge port at the bottom of the centrifugal separation container is larger than the radial cross-sectional area of ​​the heating pipeline;

[0022] The size of the sand collection outlet at the bottom of the atomizing filter container is larger than the size of the feed inlet of the atomizing filter container.

[0023] An oil sand separation method is implemented by the above oil sand separation system, and its specific steps are:

[0024] a. Crude oil enters the oil sand static pressure buffer container through the oil pipe out of the well. As the crude oil pressure is quickly released, the flow rate of the crude oil is reduced, and the crude oil will produce liquid vortex and sedimentation phenomena, which will quickly drop the sand particles in the crude oil to the bottom of the oil sand static pressure buffer container. The first clean oil outlet pipe above the oil sand static pressure buffer container transfers the clean crude oil above the oil sand static pressure buffer container, and the heating pipeline at the bottom of the oil sand static pressure buffer container transfers the crude oil containing sand particles;

[0025] b. When the crude oil containing sand enters the heating pipeline, the crude oil reduces its viscosity through heating, making the molecular activity inside it more active. At this time, the fluidity of the crude oil is better, and then the crude oil enters the centrifugal separation container;

[0026] c. After the oil sand mixed crude oil entering the centrifugal separation container is centrifuged, the crude oil with lower density will move to the center and then be transferred away through the second clean oil outlet pipe, while the sand particles with higher density will move to the periphery of the centrifugal separation container and settle to the bottom of the centrifugal separation container, and then the oil sand mixed crude oil will be transported to the atomization filter container through the pipeline;

[0027] d. After the oil-sand mixed crude oil passes through the atomizing axial small hole of the atomizing filter container, the flow cross-section suddenly increases when it enters the atomizing chamber again. At this time, the crude oil will form tiny droplets and separate from the sand particles. The droplet crude oil is filtered through the filter net and transferred through the third clean oil outlet pipe, while the sand particles in the atomizing chamber are transferred through the sand particle collection outlet under the action of gravity.

[0028] Preferably, the filter screen needs to be replaced regularly.

[0029] The invention is beneficial in that:

[0030] 1. The oil-sand mixed crude oil entering the atomizing filter container of the present invention, after being guided by the atomizing axial small holes, will form tiny droplets due to the sudden increase in the flow cross section, and then separate from the sand particles, thereby ensuring that the oil content in the final sand particles is extremely low.

[0031] 2. The present invention continuously processes the sand-containing crude oil through multiple devices, gradually separates the oil sand, and finally ensures that the sand content of the produced oil is extremely low, reduces the blockage and wear hazards of the original processing equipment, and increases the life of the crude oil equipment; and the oil content in the separated sand is also extremely low, and then with the help of a sand particle collection and squeezing box, the excess oil in the collected sand particles is squeezed out at regular intervals, further reducing the content in the sand. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of an oil sand separation system;

[0033] Figure 2 is a schematic diagram of an atomizing filter container of the present invention;

[0034] Figure 3 is a cross-sectional view of the atomizing filter container of the present invention;

[0035] Figure 4 A side view of the position of the atomizing axial small hole of the atomizing filter container of the present invention;

[0036] Figure 5 A flow chart of an oil sand separation method.

[0037] In the figure: 1-oil sand static pressure buffer container, 2-outlet oil pipe, 3-first clean oil outlet pipe, 4-heating pipeline, 5-centrifugal separation container, 6-second clean oil outlet pipe, 7-atomization filter container, 8-third clean oil outlet pipe, 9-total clean oil outlet pipe, 10-sand collection and squeezing box, 11-distributor, 71-sand collection outlet, 72-atomization axial small hole, 73-atomization cavity, 74-filter screen. DETAILED DESCRIPTION

[0038] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0039] like Figures 1 to 4 As shown, an oil sand separation system includes an oil sand static pressure buffer container 1, which is connected to an outgoing oil pipe 2. When crude oil containing sand enters the oil sand static pressure buffer container 1 through the outgoing oil pipe 2, the pressure will drop, the flow rate of the crude oil will decrease, the crude oil will produce liquid vortex and sedimentation, and the sand particles in the crude oil will quickly drop to the bottom of the oil sand static pressure buffer container 1. The first clean oil outlet pipe 3 above the oil sand static pressure buffer container 1 transfers the clean crude oil above the oil sand static pressure buffer container 1, and the heating pipeline 4 at the bottom of the oil sand static pressure buffer container 1 transfers the crude oil containing sand particles, thereby realizing the first step of oil sand separation.

[0040] A core shaft is preferably provided inside the oil sand static pressure buffer container 1. High-pressure crude oil enters the oil sand static pressure buffer container 1 through the outflow oil pipe 2 and impacts the core shaft. The core shaft can further reduce the flow rate of the crude oil and ensure the sedimentation of the sand particles.

[0041] The oil outlet of the oil outlet pipe 2 is preferably located below the oil inlet of the first clean oil outlet pipe 3 to prevent sand particles from being transferred through the first clean oil outlet pipe 3 during crude oil sedimentation.

[0042] The radial cross-sectional area of ​​the oil sand static pressure buffer container 1 of the present invention is much larger than the radial cross-sectional area of ​​the wellbore oil pipe 2. Preferably, the radial cross-sectional area of ​​the oil sand static pressure buffer container 1 is at least ten times larger than the radial cross-sectional area of ​​the wellbore oil pipe 2. Specifically, assuming that the inner diameter of the wellbore oil pipe 2 is 0.3 meters and the inner diameter of the oil sand static pressure buffer container 1 is 1 meter, since the crude oil enters the oil sand static pressure buffer container 1 through the wellbore oil pipe 2, the radial cross-sectional area increases by nearly 10 times. According to flow velocity = flow rate / radial cross-sectional area, the speed of the high-speed flowing crude oil is reduced to 1 / 10 of the original speed at this time. Therefore, the sand particles in the crude oil drop to the bottom of the oil sand static pressure buffer container 1 under the action of gravity and are transferred away from the heating pipeline 4.

[0043] The heating pipeline 4 of the present invention reduces the viscosity of the crude oil by heating, making the molecular activity in the crude oil more active. At this time, the fluidity of the crude oil is better. The outlet of the heating pipeline 4 is connected to the centrifugal separation container 5, and the crude oil with high fluidity enters the centrifugal separation container 5.

[0044] The top center of the centrifugal separation container 5 is connected to a second clean oil outlet pipe 6, and the bottom of the centrifugal separation container 5 is connected to an inclined atomization filter container 7 through a pipeline. After the oil-sand mixed crude oil entering the centrifugal separation container 5 is centrifuged, the crude oil with a smaller density will move to the center, where the sand content of the crude oil will be extremely low, and then will be transferred away through the second clean oil outlet pipe 6, while the sand particles with a larger density will move to the periphery of the centrifugal separation container 5 and settle to the bottom of the centrifugal separation container 5, and then the oil-sand mixed crude oil will be transported to the atomization filter container 7 through the pipeline.

[0045] At least one centrifugal separation container 5 is provided, and multiple centrifugal separation containers 5 are connected to the outlet of the heating pipeline 4 through a distributor 11. The simultaneous processing of multiple centrifugal separation containers 5 can improve the oil sand separation efficiency and the oil sand separation effect.

[0046] The feed inlet of the atomizing filter container 7 of the present invention is arranged at the bottom, and the discharge port of the atomizing filter container 7 is arranged at the top and is connected to the third clean oil outlet pipe 8; specifically, an atomizing chamber 73 is provided in the atomizing filter container 7, and a plurality of atomizing axial small holes 72 are provided near the feed inlet of the atomizing chamber 73, a filter screen 74 is provided near the discharge port of the atomizing chamber 73, and a sand collection outlet 71 is provided at the bottom of the inclined atomizing chamber 73.

[0047] After the oil-sand mixed crude oil passes through the atomizing axial small hole 72 of the atomizing filter container 7, the flow cross section suddenly increases when entering the atomizing chamber 73. At this time, the crude oil will form tiny droplets and separate from the sand particles. The droplet crude oil is filtered by the filter screen 74 and transferred through the third clean oil outlet pipe 8, while the sand particles in the atomizing chamber 73 are transferred through the sand collection outlet 71 under the action of gravity. The oil content in the finally separated sand is extremely low, and the sand content in the oil transferred from the third clean oil outlet pipe 8 is also extremely low.

[0048] The sand collection outlet 71 is connected to the sand collection and squeezing box 10 through a pipeline, so that the excess oil in the collected sand can be squeezed out at regular intervals, and the sand can be separated and sent to hazardous waste treatment.

[0049] The outlets of the first clean oil outlet pipe 3, the second clean oil outlet pipe 6 and the third clean oil outlet pipe 8 of the present invention are connected to a main clean oil outlet pipe 9, and the oil processed in each container is collected in the main clean oil outlet pipe 9 for subsequent crude oil processing.

[0050] In order to further improve the purity of the oil in the crude oil, the radial cross-sectional area of ​​the first clean oil outlet pipe 3 is preferably smaller than the radial cross-sectional area of ​​the wellbore oil pipe 2; the radial cross-sectional area of ​​the second clean oil outlet pipe 6 is preferably smaller than the radial cross-sectional area of ​​the heating pipeline 4; the radial cross-sectional area of ​​the third clean oil outlet pipe 8 is preferably smaller than the size of the feed port of the atomizing filter container 7. The purpose is to make the radial cross-sectional area of ​​the pipe outputting the oil in the container smaller than the size of the oil sand mixed crude oil feed port on the container, so that the oil sand mixed crude oil entering the container can be fully processed in the container.

[0051] In addition, since the sand content in the oil-sand mixed crude oil will increase after each processing in a container, in order to reduce the sedimentation of sand particles at the discharge port of the container or the adjacent discharge pipeline and the occurrence of blockage accidents, the radial cross-sectional area of ​​the heating pipeline 4 of the present invention is preferably larger than the radial cross-sectional area of ​​the outflowing oil pipe 2; the size of the bottom discharge port of the centrifugal separation container 5 is preferably larger than the radial cross-sectional area of ​​the heating pipeline 4; the size of the sand collection outlet 71 at the bottom of the atomizing filter container 7 is preferably larger than the size of the feed port of the atomizing filter container 7.

[0052] The present invention also provides an oil sand separation method, which is implemented by the above oil sand separation system, such as Figure 5 As shown, the specific steps are:

[0053] a. The crude oil enters the oil sand static pressure buffer container 1 through the wellbore oil pipe 2. As the crude oil pressure is quickly released, the flow rate of the crude oil is reduced, and the crude oil will produce liquid vortex and sedimentation phenomena to quickly drop the sand particles in the crude oil to the bottom of the oil sand static pressure buffer container 1. The first clean oil outlet pipe 3 above the oil sand static pressure buffer container 1 transfers the clean crude oil above the oil sand static pressure buffer container 1, and the heating pipeline 4 at the bottom of the oil sand static pressure buffer container 1 transfers the crude oil containing sand particles;

[0054] b. When the crude oil containing sand enters the heating pipeline 4, the crude oil is heated to reduce its viscosity and make the molecular activity inside it more active. At this time, the fluidity of the crude oil is better, and then the crude oil enters the centrifugal separation container 5;

[0055] c. After the oil-sand mixed crude oil entering the centrifugal separation container 5 is centrifuged, the crude oil with a smaller density will move toward the center and then be transferred away through the second clean oil outlet pipe 6, while the sand particles with a larger density will move toward the periphery of the centrifugal separation container 5 and settle to the bottom of the centrifugal separation container 5, and then the oil-sand mixed crude oil will be transported to the atomization filter container 7 through the pipeline;

[0056] d. After the oil-sand mixed crude oil passes through the atomizing axial small hole 72 of the atomizing filter container 7, the flow cross-section suddenly increases when it enters the atomizing chamber 73. At this time, the crude oil will form tiny droplets and separate from the sand particles. The droplet crude oil is filtered by the filter screen 74 and then transferred through the third clean oil outlet pipe 8. The filter screen 74 needs to be replaced regularly, and the sand particles in the atomizing chamber 73 are transferred through the sand particle collection outlet 71 under the action of gravity.

[0057] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the protection scope defined by the claims attached to this application.

Claims

1. An oil sand separation system, characterized in that: It comprises an oil sand static pressure buffer container (1), the oil sand static pressure buffer container (1) is connected to a well oil pipe (2), a first clean oil outlet pipe (3) is provided above the oil sand static pressure buffer container (1), and a heating pipeline (4) is connected to the bottom of the oil sand static pressure buffer container (1); The outlet of the heating pipeline (4) is connected to a centrifugal separation container (5), the top center of the centrifugal separation container (5) is connected to a second clean oil outlet pipe (6), and the bottom of the centrifugal separation container (5) is connected to an inclined atomization filter container (7) through a pipeline; The feed inlet of the atomizing filter container (7) is arranged at the bottom, and the discharge port of the atomizing filter container (7) is arranged at the top and is connected to a third clean oil outlet pipe (8); An atomizing chamber (73) is provided in the atomizing filter container (7). A plurality of atomizing axial small holes (72) are provided in the atomizing chamber (73) near the feed inlet. After the oil-sand mixed crude oil passes through the atomizing axial small holes (72) of the atomizing filter container (7), it enters the atomizing chamber (73) and the flow cross section suddenly increases. At this time, the crude oil forms tiny droplets and is separated from the sand particles. A filter screen (74) is provided in the atomizing chamber (73) near the feed outlet. The droplets of crude oil are filtered through the filter screen (74) and then transferred away through the third clean oil outlet pipe (8). A sand particle collection outlet (71) is provided at the bottom of the inclined atomizing chamber (73). The sand particles are transferred away through the sand particle collection outlet (71) under the action of gravity.

2. An oil sand separation system according to claim 1, characterized in that: The radial cross-sectional area of ​​the oil sand static pressure buffer container (1) is at least ten times greater than the radial cross-sectional area of ​​the oil pipe (2) out of the well.

3. The oil sand separation system according to claim 1, characterized in that: A core shaft is provided inside the oil sand static pressure buffer container (1).

4. The oil sand separation system according to claim 1, characterized in that: At least one centrifugal separation container (5) is provided, and a plurality of the centrifugal separation containers (5) are connected to the outlet of the heating pipeline (4) via a distributor (11).

5. The oil sand separation system according to claim 1, characterized in that: The oil outlet of the wellbore oil pipe (2) is located below the oil inlet of the first clean oil outlet pipe (3).

6. The oil sand separation system according to claim 1, characterized in that: The sand collection outlet (71) is connected to a sand collection and squeezing box (10) via a pipeline.

7. The oil sand separation system according to claim 1, characterized in that: The outlets of the first clean oil outlet pipe (3), the second clean oil outlet pipe (6), and the third clean oil outlet pipe (8) are connected to a main clean oil outlet pipe (9); The radial cross-sectional area of ​​the first clean oil outlet pipe (3) is smaller than the radial cross-sectional area of ​​the well outlet pipe (2); The radial cross-sectional area of ​​the second clean oil outlet pipe (6) is smaller than the radial cross-sectional area of ​​the heating pipeline (4); The radial cross-sectional area of ​​the third clean oil outlet pipe (8) is smaller than the size of the feed port of the atomizing filter container (7).

8. The oil sand separation system according to claim 1, characterized in that: The radial cross-sectional area of ​​the heating pipeline (4) is larger than the radial cross-sectional area of ​​the oil pipe (2) out of the well; The size of the discharge port at the bottom of the centrifugal separation container (5) is larger than the radial cross-sectional area of ​​the heating pipeline (4); The size of the sand collection outlet (71) at the bottom of the atomizing filter container (7) is larger than the size of the feed inlet of the atomizing filter container (7).

9. An oil sand separation method, characterized in that: The oil sand separation system is implemented by any one of claims 1 to 8, and the specific steps are: a. Crude oil enters the oil sand static pressure buffer container (1) through the wellbore oil pipe (2). As the crude oil pressure is rapidly released, the flow rate of the crude oil decreases, and the crude oil generates liquid vortex and sedimentation phenomena, which rapidly drop the sand particles in the crude oil to the bottom of the oil sand static pressure buffer container (1). The first clean oil outlet pipe (3) above the oil sand static pressure buffer container (1) transfers the clean crude oil above the oil sand static pressure buffer container (1), and the heating pipeline (4) at the bottom of the oil sand static pressure buffer container (1) transfers the crude oil containing sand particles; b. When the crude oil containing sand enters the heating pipeline (4), the crude oil is heated to reduce its viscosity and make the molecular activity inside it more active. At this time, the fluidity of the crude oil is better, and then the crude oil enters the centrifugal separation container (5); c. After the oil-sand mixed crude oil entering the centrifugal separation container (5) is centrifuged, the crude oil with a smaller density will move toward the center and then be transferred away through the second clean oil outlet pipe (6), while the sand particles with a larger density will move toward the periphery of the centrifugal separation container (5) and settle to the bottom of the centrifugal separation container (5), and then the oil-sand mixed crude oil will be transported to the atomization filter container (7) through the pipeline; d. After the oil-sand mixed crude oil passes through the atomizing axial small hole (72) of the atomizing filter container (7), the flow cross section suddenly increases when it enters the atomizing chamber (73). At this time, the crude oil will form tiny droplets and separate from the sand particles. The droplets of crude oil are filtered by the filter screen (74) and then transferred through the third clean oil outlet pipe (8), while the sand particles in the atomizing chamber (73) are transferred through the sand particle collection outlet (71) under the action of gravity.

10. An oil sand separation method according to claim 9, characterized in that: The filter screen (74) needs to be replaced regularly.

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