CN102251766A - Novel pipeline type flow deflector oil-water separator rotation starting device - Google Patents

Abstract

The invention discloses a novel pipeline-type oil-water separator spinning device, comprising: more than two deflectors that can be fixedly and obliquely installed in the pipeline, and the deflectors are evenly distributed along the circumference of the pipeline, The pipes are stacked in sequence in the axial direction; when the fluid mixed with oil and water flows through the deflector, a center-symmetrical swirl field is formed, thereby centrifuging the oil and water. The present invention has the following effects: when oil and water enter the swirling device equipped with the oil-water separator of the present invention in a certain proportion, when they meet the deflectors, since the circumferential directions of the guide vanes are inclined in the same direction, each guide vane guides the flow along the circular direction The part of the fluid flow is basically the same, so a consistent vortex effect can be achieved, and a stronger vortex can be formed. At the same time, the axially installed deflector reduces the radial movement distance of the oil droplet, which can promote the oil droplet to move faster. movement to the axis. In this way, a good oil-water separation effect can be achieved.

Description

A new type of pipe-type deflector-type oil-water separator spin-up device

technical field

The invention relates to a device for swirling to form a swirling flow field in a novel oil-water cyclone separator, in particular to an oil-water separator swirling device used in an oil-water separation system downhole.

Background technique

With the prolongation of oilfield development time, water production continues to increase, which increases production costs. In order to reduce production costs, it has become a consensus to use downhole oil-water separators to separate water and reinject it into formations in situ.

The separation principles currently used for downhole oil-water separation are mainly gravity and centrifugation. For example, the patent publication number: CN 101025080A, the method of multi-cup iso-flow downhole oil-water separator to realize injection and production of high water-cut wells in the same well, which uses the principle of gravity. Oil and water are separated by natural sedimentation. Publication number: CN2931780, a downhole oil-water separator, describes a conical cyclone that adopts the principle of centrifugal separation to separate oil and water. In actual production, it is often necessary to achieve rapid separation of oil-water separation to improve production efficiency. Although gravity separation is an effective separation technology, the processing speed is relatively slow and the required vertical height is relatively large, so it is generally preferred to use Centrifugal principle separates oil and water, thereby improving separation efficiency.

There are also many kinds of cyclone equipment for downhole oil-water separation based on the principle of centrifugal separation, which can be divided into tangential type and axial type according to the spinning method. For example, the publication number is CN 201496054U, a swirling oil-water separator for rod pumps (applied to downhole oil-water separation), which uses double tangential inlets to form a swirl field; announcement number: CN 2118814U, a downhole oil-water separator Separator, which describes the use of axially mounted dynamic deflectors to rotate to form a swirl field. Due to the limited working space in the downhole, the use of tangential inlet swirling makes the radial structure of the cyclone larger, which is not conducive to installation in the downhole. If it is used in the downhole, the overall size of the cyclone will be reduced, so the use of shaft Directional spin is a better choice. However, in the underground, the use of dynamic deflectors for spinning also has disadvantages, which makes the equipment complicated and maintenance troublesome.

Contents of the invention

The purpose of the present invention is to propose a new type of pipeline type oil-water separator spin-up device, which can improve the swirling capacity of the above-mentioned oil-water cyclone separator, which is not compact in the swirling structure or difficult to maintain when it is used in the downhole. Symmetrical stability of the field, improved oil-water separation technology, and increased space utilization of downhole oil-water separators.

A novel pipeline-type oil-water separator spinning device provided by the present invention includes: more than 2 deflectors that can be fixedly and obliquely installed in the pipeline, the deflectors are evenly distributed along the circumference of the pipeline, and The axial direction of the pipes are stacked successively; when the fluid mixed with oil and water flows through the deflector, a center-symmetrical swirl field is formed, so that the oil and water are centrifugally separated.

Preferably, the deflector is semi-elliptical, and the included angle θ between the long axis of the deflector and the cross section of the pipe is: 10°≤θ≤60°.

Preferably, the included angle α between the short axis of the deflector and the cross section of the pipe is: 0°≤α≤45°.

Preferably, the included angle α between the short axis of the deflector and the cross section of the pipe is 0°.

Preferably, the number of the guide vanes is 2-6.

Preferably, the thickness h of the deflector is 2mm˜7mm.

The present invention has the following advantages:

1. When oil and water enter the spinning device equipped with the oil-water separator of the present invention in a certain proportion, they meet the deflectors. Since the circumference of the deflectors is inclined in the same direction, the part of the fluid guided by each deflector along the annular direction The flow is basically the same, so a consistent vortex effect can be achieved, which ensures that the swirl field formed after passing through the deflector is centrally symmetrical. The oil-water mixture moves in one direction in the pipeline after being guided by the deflector. During its forward movement, it receives less interference from the external flow field. Therefore, the formed symmetrical flow field is relatively stable. In a symmetrical and stable swirl field, oil and water are subjected to centripetal buoyancy greater than centrifugal force due to the low density of the oil phase, so they move toward the center of the tube, while water moves in the opposite direction, that is, they are distributed near the tube wall; in symmetrical and stable In the flow field, the oil nuclei are stably distributed in the central area of the circular pipe, and there will be no large displacement shaking; in this way, a good oil-water separation effect can be achieved;

2. The installation method of the static deflector of the present invention avoids the sealing problem of using the dynamic deflector in the downhole high-pressure environment. In addition, the swirl method of the present invention overcomes the swirling flow formed by the tangential inlet guide. The interference of the field makes the swirl field more symmetrical and stable, and there is no reverse flow of oil and water after tangential diversion, which can avoid the oil-water remixing phenomenon caused by the reverse motion of the oil-water two-phase, thereby improving the separation efficiency.

3. The invented spinning device is installed in the pipeline. It does not need to add an additional pipe to become a two-dimensional structure like the tangential inlet, which saves space, so that the underground space can be used more effectively and the processing capacity can be improved. It is more suitable for application in the downhole oil-water separation system; on the other hand, in the high-pressure environment, the tangential inlet makes the tangential part a weak link, and the welding strength of this part needs to be strengthened, while the guide installed axially on the inner wall of the pipeline Tape-out does not have this problem, so the invention has good industrial application prospects.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the structure of the deflector of the present invention.

Detailed ways

As shown in Figure 1, the swirling device of the present invention includes: 4 deflectors 4, 5, 7, 8 that can be fixedly and obliquely installed in the pipeline 3, and the deflectors 4, 5, 7, 8 are along the length of the pipeline 3. They are evenly distributed in the circumferential direction and stacked in sequence in the axial direction of the pipe 3 . When the fluid mixed with oil and water flows through the deflectors 4, 5, 7, and 8 along the flow direction 6, a center-symmetrical swirl field will be formed, in which the oil and water are separated due to different centrifugal forces due to different densities. .

As shown in Figure 2, the deflectors 4, 5, 7, and 8 are made of semi-elliptical stainless steel or other wear-resistant materials, and the long axis of the deflectors 4, 5, 7, 8 is the same as the cross-section of the pipeline 3. The included angle θ is 45°, and the short axis is parallel to the cross section of the pipe 3 , that is, the included angle α between the short axis and the cross section of the pipe 3 is 0°.

The traditional tangential inlet swirling method forms a swirl field, in which the oil phase moves toward the central area to form an oil core, and uses the reverse flow of the oil core and water in different areas to achieve oil-water separation. When the swirl field is unstable At this time, part of the oil in the oil core may be taken away by the reverse flow of water, which increases the difficulty of oil-water separation. And the swirl mode of the present invention promptly utilizes the axially installed static deflectors 4, 5, 7, 8 to divert the flow to form a swirl field, and in the swirl field, the oil core formed by the oil phase and the oil particles distributed near the pipe wall The movement of the water phases in the same direction reduces the risk mentioned above.

When oil and water enter the present invention in a certain proportion, they meet guide vanes 4, 5, 7, and 8. Since guide vanes 4, 5, 7, and 8 are inclined in the same direction, each guide vane guides the flow along the annular direction The part of the fluid flow is basically the same, so a consistent vortex effect can be achieved, which ensures that the swirl field formed after passing through the deflector is centrally symmetrical. In addition, the oil-water mixture moves in one direction in the pipeline 3 after being guided by the deflectors 4, 5, 7, and 8. During its forward movement, it receives less interference from the external flow field. Therefore, the formed symmetrical The flow field is relatively stable. In the symmetrical and stable swirl field, due to the low density of the oil phase, the centripetal buoyancy force received by oil and water is greater than the centrifugal force, so it moves towards the center of the tube, while the water moves in the opposite direction, that is, it is distributed on the tube wall. Nearby; in a symmetrical and stable flow field, the oil nuclei are stably distributed in the central area of the circular pipe 3, and there will be no large-displacement shaking; in this way, a good oil-water separation effect can be achieved.

In a symmetrical and stable swirl field, oil and water are subjected to centripetal buoyancy greater than centrifugal force due to the low density of the oil phase, so they move toward the center of the tube, while water moves in the opposite direction, that is, they are distributed near the tube wall. In the symmetrical and stable flow field, the oil nuclei are stably distributed in the central area of the circular pipe, and there will be no large-displacement shaking. Drop faster movement to the axis.

In the embodiment of the present invention, the deflectors 4, 5, 7, 8 are installed in the pipeline 3 at an angle θ between the long axis and the cross section of the pipeline 3 is 45°, of course, it can also be 10°≤θ ≤60°. The short axis is parallel to the cross section of the pipe 3 , that is, the angle α between the short axis and the cross section of the pipe 3 is 0°, of course, it can also be 0°≦α≦45°. The thickness h of the deflectors 4, 5, 7 and 8 can usually be set at 2 mm to 7 mm to ensure sufficient strength. The diameter d of the pipe 3 is 75 mm, and the thickness of the deflectors is 2 mm. ,

In the embodiment of the present invention, the number of deflectors can also be set at 2 to 6, which can also achieve the same or similar oil-water separation effect. The deflectors are sequentially overlapped in the central area of the circular pipe 3, and the overlapping points of the centers are kept close to each other, so as to ensure that oil and water are mixed and guided through the deflectors.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to within the scope of the technical solutions of the present invention.

Claims (6)

1. a novel pipeline formula oil water separator plays cyclone, it is characterized in that, comprising: but constant tilt is installed in ducted flow deflector more than 2, and described flow deflector is circumferentially uniform along described pipeline, and axially stacked successively at described pipeline; When the fluid of profit mixing is flowed through described flow deflector, form centrosymmetric eddy flow field, thereby with oil and water centrifugation.

2. device as claimed in claim 1 is characterized in that, described flow deflector is a half elliptic, and the angle theta of the major axis of this flow deflector and the cross section of described pipeline is: 10 °≤θ≤60 °.

3. device as claimed in claim 2 is characterized in that, the angle α of the minor axis of described flow deflector and the cross section of described pipeline is: 0 °≤α≤45 °.

4. device as claimed in claim 3 is characterized in that, the angle α of the minor axis of described flow deflector and the cross section of described pipeline is 0 °.

5. device as claimed in claim 4 is characterized in that, the quantity of described flow deflector is 2～6.

6. as the arbitrary described device of claim 1 to 5, it is characterized in that the thickness h of described flow deflector is 2mm～7mm.

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