CN102743898B - Ducted two-stage flow deflector type oil-water separator and its application method - Google Patents

Abstract

The invention discloses a pipeline-type two-stage deflector-type oil-water separator and an application method thereof, wherein the pipeline-type two-stage deflector-type oil-water separator comprises: a first-stage liquid inlet pipe section and a gradually expanding pipe section connected in sequence , a first-stage swirl generation pipe section, a first-stage water removal pipe section, and a second-stage cyclone separation pipe section; wherein, the first-stage swirl generation pipe section and the second-stage cyclone separation pipe section all include more than 2 pieces fixed and inclined installed thereon deflectors; more than one set of water removal holes are opened on the primary water removal pipe section and the secondary cyclone separation pipe section. The invention can realize fast and efficient oil-water separation in a limited space, and has good industrial application prospect.

Description

Pipeline two-stage deflector type oil-water separator and application method thereof

technical field

The invention relates to a device for separating oil-water two-phase mixed liquid, in particular to a pipeline-type two-stage deflector type oil-water separator used in downhole and seabed separation systems. the

Background technique

In the petroleum industry, oil-water separation equipment is an important production equipment. Separation technology is crucial to the development of the industry. the

The current cyclone separator is divided into two types according to the function: oil-water pre-separation and sewage treatment. In order to discharge the oil-water mixture after treatment, it usually requires a combination of multiple sets of cyclone tubes. In the process, a separator is generally used. Series or parallel, this configuration takes up a lot of space, the structure is not compact, and the operation is complicated. For example, U.S. Patent No. 4995989 describes a combined liquid-liquid separation equipment. The equipment adopts two-stage separation, the front stage adopts a cyclone device, and the rear stage adopts a cyclone separator, which is used to strengthen the separation of two-phase liquids with different specific gravity; The invention of patent application number 02109677.5 describes a two-stage separation, including a large cyclone separator for pre-separation, and several small cyclone separators for further separation, which is bulky. The application number is 200610037772.8, which is a three-stage separation system. The three-stage cyclone is assembled in a tank to separate oil and water to meet the discharge standard. The above-mentioned separator adopts the traditional tangential inlet swirling method to form a swirling flow field, and the tangential inlet is perpendicular to the flow direction of the oil-water outlet, so there must be certain requirements for space during multi-stage separation. In the actual downhole separation, it is often necessary to quickly separate the produced fluid in a narrow space to improve production efficiency. Although the above-mentioned cyclones can also achieve rapid separation, the requirements for radial dimensions are relatively high when the cyclones are connected in series. , thus limiting their application in downhole separation. the

Contents of the invention

Aiming at the deficiencies in the prior art of the above multi-stage oil-water separation device, the present invention provides a compact two-stage separator, which realizes fast and efficient separation of oil-water separation in a limited space. the

In order to solve the above technical problems, the present invention provides a pipeline-type two-stage deflector type oil-water separator, including: a first-stage liquid inlet pipe section, a gradual expansion pipe section, a first-stage swirl flow generation pipe section, and a first-stage water removal pipe section connected in sequence and the secondary cyclone separation pipe section; wherein, the primary cyclone generation pipe section and the secondary cyclone separation pipe section all include more than 2 deflectors fixed and inclined installed thereon; in the primary water removal pipe section There are more than one set of water removal holes on the second-stage cyclone separation pipe section;

A first flowmeter is installed on the first-stage liquid inlet pipe section; a cylinder is arranged outside the pipe section between the water-removal holes of the first-stage water removal pipe section and the second-stage cyclone separation pipe section, and the cylinder is used to accommodate the The liquid discharged from the first water removal hole and the second water removal hole; the cylinder is connected with a water outlet pipe section orthogonal to it, and the water is discharged through the water outlet pipe section, and an elbow is installed on the water outlet pipe section so that the outlet of the water outlet pipe section Parallel to the direction of incoming flow, a second flow meter and a ball valve are installed on the outlet pipe section, and the percentage of the flow diverted from the outlet of the outlet pipe section to the flow rate of the primary inlet pipe section is controlled by adjusting the ball valve. the

Preferably, the above-mentioned oil-water separator also has the following characteristics:

The deflector installed on the first-stage swirl generation pipe section is a first-stage deflector, and the first-stage deflector is uniformly distributed along the circumference of the first-stage swirl generation pipe section, and is formed when the first-stage swirl is generated The pipe sections are stacked in sequence in the axial direction; the deflector vanes installed on the secondary cyclone separation pipe section are secondary deflector vanes, and the secondary flow guide vanes are evenly distributed along the circumference of the secondary cyclone separation pipe section, and In the axial direction of the two-stage cyclone separation pipe sections, they are stacked successively. the

Preferably, the above-mentioned oil-water separator also has the following characteristics:

The first deflector is semi-elliptical, and the angle θ between the major axis of the first deflector and the cross-section of the first-stage swirl flow generating pipe section is: 10°≤θ≤60°, the first The included angle α between the minor axis of a deflector and the cross-section of the first-stage swirl flow generating pipe is: 0°≤α≤45°. the

Preferably, the above-mentioned oil-water separator also has the following characteristics:

There are four first guide vanes, the angle θ between the long axis of the first guide vanes and the cross-section of the primary swirl flow generating pipe section is 45°, and the short length of the first guide vanes is The included angle α between the axis and the cross-section of the primary swirl flow generating pipe section is 0°. the

Preferably, the above-mentioned oil-water separator also has the following characteristics:

The second deflector is semi-elliptical, and the angle β between the long axis of the second deflector and the cross-section of the secondary cyclone separation pipe section is: 10°≤β≤60°, the first The included angle Ф between the minor axis of the second deflector and the cross-section of the secondary cyclone separation pipe is: 0°≤Ф≤45°. the

Preferably, the above-mentioned oil-water separator also has the following characteristics:

There are 3 second guide vanes, the angle β between the long axis of the second guide vanes and the cross-section of the secondary cyclone separation pipe section is 50°, and the short length of the second guide vanes The included angle Φ between the axis and the cross-section of the secondary cyclone separation pipe section is 0°. the

Preferably, the above-mentioned oil-water separator also has the following characteristics:

The water removal hole opened on the first-level water removal pipe section is a first-level water removal hole, and the outer circumferential surface of the first-level water removal hole is tangent to the inner wall of the first-level water removal pipe section. The aperture d' of the water hole is: d'≤bD-cαD, wherein, the b and c are constants, D is the diameter at the output port of the first-stage water removal pipe section, and α is the pipeline-type two-stage guide The inlet oil content of the flow-sheet type oil-water separator. the

Preferably, the above-mentioned oil-water separator also has the following characteristics:

The water removal hole opened on the secondary cyclone separation pipe section is a secondary water removal hole, and the outer circumferential surface of the secondary water removal hole is tangent to the inner wall of the secondary cyclone separation pipe section. The aperture d' of the secondary water removal hole is: d'≤bD-0.5cαD, wherein the b and c are constants, D is the diameter of the secondary cyclone separation pipe section, and α is the pipeline-type two-stage deflector The inlet oil content of the type oil-water separator. the

A first flowmeter is installed on the first-stage liquid inlet pipe section; a cylinder is arranged outside the pipe section between the water-removal holes of the first-stage water removal pipe section and the second-stage cyclone separation pipe section, and the cylinder is used to accommodate the The liquid discharged from the first water removal hole and the second water removal hole; the cylinder is connected with a water outlet pipe section orthogonal to it, and the water is discharged through the water outlet pipe section, and an elbow is installed on the water outlet pipe section so that the outlet of the water outlet pipe section Parallel to the direction of incoming flow, a second flow meter and a ball valve are installed on the outlet pipe section, and the percentage of the flow diverted from the outlet of the outlet pipe section to the flow rate of the primary inlet pipe section is controlled by adjusting the ball valve. the

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 is less disturbed by the external flow field, so 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 outer circumferential surface of the first water removal hole is tangent to the inner wall of the first-level water removal pipe section, and the aperture d' of the first water removal hole is set to d'≤bD-cαD; the outer circumference of the second water removal hole The circumferential surface is tangent to the inner wall of the secondary cyclone separation pipe section, and the aperture d' of the second water removal hole is: d'≤bD-0.5cαD; in this way, the water removal holes of different diameters can be further adjusted according to the oil content , improving the oil-water separation efficiency;

3. The present invention is a two-stage oil-water separation device using the principle of swirling flow. The inlet and outlet of the oil-water mixture of the oil-water separator of the present invention have the same inner diameter, and only need to cut off a section of the liquid collection pipeline that needs to be processed to install the separator , does not change the pipe flow direction, good adaptability;

4. The swirl flow generation pipe section of the present invention is installed in the pipeline, it does not need to add another pipe to become a two-dimensional structure like the tangential inlet, and the flow direction of the three ports is parallel, so it saves space and can be more Effective use of downhole space, especially for equipment that requires multi-stage separation, the flow direction of the first-stage cyclone device and the second-stage cyclone device are consistent, and the secondary installation does not need to be changed in the radial direction, which is more suitable for multi-stage downhole applications In the oil-water separation system; on the other hand, in the underwater environment, the bottom flow has high requirements on the stability of the multi-stage separator device, and the high-pressure environment makes the traditional tangential inlet a weak link, and additional strengthening is required Welding strength, but the pipeline type two-stage deflector type oil-water separator does not have this problem, its secondary structure is compact, and the space utilization rate is high, so the present invention has good industrial application prospects. the

Description of drawings

Figure 1 is an overall schematic diagram of a pipeline-type two-stage deflector-type oil-water separator;

Figure 2 is a schematic diagram of the installation of the deflector;

Figure 3 is a schematic diagram of opening the water removal hole. the

Detailed ways

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other. the

The pipeline-type two-stage deflector-type oil-water separator used in downhole and future underwater separation systems according to the embodiment of the present invention, as shown in Figure 1, includes the following components: a first-stage liquid inlet pipe section 1, and a gradual expansion pipe section 2 1. The primary swirl generation pipe section 3, the primary water removal pipe section 5, the secondary cyclone separation pipe section 12, and the water outlet pipe section 6. Wherein, a flow meter 16 is installed on the liquid inlet pipe of the liquid inlet pipe section 1 , and a flow meter 7 and a ball valve 8 are installed on the water outlet pipe section 6 . A first-stage guide vane 4 is installed in the first-stage swirl flow generating pipe section 3 . A secondary flow deflector 13 is installed in the secondary cyclone separation pipe section 12 . the

As shown in Figure 2, the first-stage swirl flow generating pipe section 3 further includes four first-stage guide vanes that can be fixedly and obliquely installed thereon: the first-stage guide vane 41, the second-stage guide vane 42, the first-stage guide vane The three first-level guide vanes 43 and the fourth first-level guide vanes 44, the first-level guide vanes 41, 42, 43, and 44 are uniformly distributed along the circumferential direction of the first-stage swirl flow generation pipe section 3, and are formed in the first-stage swirl flow generation pipe section 3 The axial directions are superimposed one after the other. When the fluid mixed with oil and water flows through the first-stage deflectors 41, 42, 43, and 44 along the flow direction 17, a center-symmetrical swirl field will be formed. be separated. The primary deflectors 41, 42, 43, 44 are made of semi-elliptical stainless steel or other wear-resistant materials. The included angle θ of the cross section is 45°, and the short axis is parallel to the cross section of the primary swirl generating pipe section 3, that is, the included angle α between the short axis and the cross section of the primary swirling flow generating pipe section 3 is 0°. the

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 one-stage deflector 41, 42, 43, 44 to guide the flow to form a swirl field, and the oil core formed by the oil phase in the swirl field and the oil core near the pipe wall The distribution of water phases moving in the same direction reduces the above risk. the

In the embodiment of the present invention, the primary baffles 41, 42, 43, 44 are installed in the same direction on the primary vortex with the angle θ between the long axis and the cross section of the primary vortex generating pipe section 3 being 45°. In the generation pipe section 3, of course, 10°≤θ≤60° can also be used. The short axis is parallel to the cross-section of the first-stage swirl generation pipe section 3, that is, the angle α between the short axis and the cross-section of the first-stage swirl flow generation pipe section 3 is 0°, of course, it can also be 0°≤α≤45° . The thickness h of the primary baffles 41, 42, 43, and 44 can usually be set at 2 mm to 7 mm to ensure sufficient strength. The diameter d of the primary swirl generation pipe section 3 is 75 mm, and the primary baffles The thickness is 2mm. the

In the embodiment of the present invention, the installed number of the first-stage deflectors 4 can also be set at 2 to 6 pieces, which can also achieve the same or similar oil-water separation effect. The first-stage deflectors are overlapped sequentially in the central area of the first-stage swirl flow generation pipe section 3, and the overlapping points of the centers are kept close together, so as to ensure that the oil-water mixture is guided through the guide vanes. the

As shown in Figure 1, the first-level water removal pipe section 5 is provided with more than one group of water-removal holes 15 at appropriate intervals along the oil-water flow to the mainstream direction, and the number of water-removal holes 15 in each group is the same as that of the first-level guide vanes 41, 42, 43, 44 have the same number and are evenly distributed along the circumference of the primary water removal pipe section 5. The outer circumferential surface of the first-level water removal hole 15 is tangent to the inner wall of the first-level water removal pipe section 5, as shown in Figure 3, and the aperture d' of the water removal hole 15 is: d'≤bD-cαD, wherein, b, c is a constant, D is the diameter at the outlet of the primary water removal pipe section 5, and α is the oil content at the inlet of the oil-water separator. In the embodiment of the present invention, b is 0.25, D is 0.05m, and c is 0.8925. By arranging the water removal hole in this way, the probability of oil flowing out from the water outlet pipeline is greatly reduced, so that it can be applied downhole to separate water and reinject it into the formation in situ. the

After the primary water removal pipe section 5, the secondary cyclone separation pipe section 12 is connected, and the secondary cyclone separation pipe section 12 is equipped with a secondary baffle 13 with the same rotation direction as the primary baffle, and the secondary baffle 13 are sequentially stacked on the secondary cyclone separation pipe section 12 in the axial direction. When the fluid mixed with oil and water flows through the secondary deflector 13, the swirl strength will be enhanced, so that a stronger swirl field with central symmetry will be formed after passing through the primary water removal pipe section 5. In the swirl field, the oil and water will have different densities. The centrifugal force received is different and further separated. The secondary deflector 13 is also made of semi-elliptical stainless steel or other wear-resistant materials. The angle β between the major axis of the secondary deflector 13 and the cross section of the secondary cyclone separation pipe section 12 is 50°, and the short axis It is parallel to the cross section of the secondary cyclone separation pipe section 12, that is, the included angle Φ between the short axis and the cross section of the secondary cyclone separation pipe section 12 is 0°. the

In the embodiment of the present invention, the secondary baffles 13 are installed in the secondary cyclone separation pipe section 12 in the same direction with the angle β between the long axis and the cross section of the secondary cyclone separation pipe section 12 being 50°. , can also be 10°≤β≤60°. The minor axis is parallel to the cross section of the secondary cyclone separation pipe section 12, that is, the included angle Ф between the short axis and the cross section of the secondary cyclone separation pipe section 12 is 0°, of course, it can also be 0°≤Ф≤45° . The thickness of the secondary deflector 13 can generally be set at 2 mm to 7 mm. the

In the embodiment of the present invention, the installation number of the secondary deflectors 13 can be set at 2 to 6 pieces, which can achieve the same or similar oil-water separation effect. Each secondary deflector is sequentially overlapped in the center area of the secondary cyclone separation pipe section 12, and the overlapping points of the centers are kept close to each other, so as to ensure that the oil-water mixture is guided through the deflector. the

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 the oil-water separation is achieved by using the reverse flow of the oil core and water in different areas. The outlet flow directions of the outlets are perpendicular to each other, so there are certain requirements for the radial size to realize the two-stage series connection. And the two-stage deflector type swirl mode of the present invention is connected in series along the flow direction, that is, utilizes the axially installed static primary deflectors 41, 42, 43, 44 to guide the flow to form a swirl field, and after removing water, Continue to install the secondary deflector 13 along the flow direction to strengthen the swirling flow and further separate the water. It is used in occasions where the implementation space is required. the

On the secondary cyclone separation pipe section 12, at a certain length from the secondary deflector 13, as shown in Fig. The number of groups of dewatering holes 11 is the same as the number of secondary deflectors 13 , and they are evenly distributed along the circumferential direction of the secondary cyclone separation pipe section 12 . The outer circumferential surface of the secondary water removal hole 11 is tangent to the inner wall of the secondary cyclone separation pipe section 12, as shown in Figure 3, and the aperture d' of the secondary water removal hole 11 is: d'≤bD-0.5cαD, Wherein, b and c are constants, D is the diameter of the secondary cyclone separation pipe section 12, and α is the oil content at the inlet of the oil-water separator. In the embodiment of the present invention, b is 0.25, D is 0.05m, and c is 0.8925. the

There is a concentric cylinder 14 to form a chamber with it outside the pipe section between the first-stage water removal pipe section 5 and the second-stage cyclone separation pipe section 12 except for the water hole, and the chamber includes a chamber for accommodating the first-stage and second-stage water removal pipes. The liquid discharged from the hole is equipped with an outlet pipe section 6 orthogonal to it on the cylinder 14, and the water is discharged through the outlet pipe section 6. An elbow is installed on the outlet pipe section 6, so that the outlet of the outlet pipe is finally parallel to the direction of the incoming flow. The outlet pipe section 6 is equipped with a flow meter 7 and a ball valve 8, and the percentage of the flow diverted from the outlet 9 to the flow of the inlet pipe section 1 is controlled by adjusting the ball valve 8. The remaining incoming liquid is discharged through the outlet 10 downstream of the main flow without changing the flow direction of the main flow. The outlet 10 is the outlet installed at the output end of the secondary cyclone separation pipe section 12, and the outlet 10 is an oil-rich outlet. the

The method of the pipeline-type two-stage deflector type oil-water separator applied in the underground and future underwater separation systems provided by the present invention includes:

The oil well producing fluid with an oil concentration between 5% and 20% enters from the primary liquid inlet pipe section 1 through the first flowmeter 16 at a flow rate of 15m3/h, and the first flowmeter 16 at the entrance records the inlet flow rate;

After the diversion of the gradually expanding pipe section 2, the oil-water two-phase mixed liquid smoothly transitions to the first-stage swirling flow generation pipe section 3, and flows through the first guide vanes 41, 42, 43, 44 to form a high-speed rotating fluid. Under the action, the separation is rapid, and the denser water phase is enriched on the inner wall of the tube, while the less dense oil phase is enriched in the center of the tube. The separated oil-water two phases enter the primary water removal pipe section 5 under the action of inertia. In the primary water removal pipe section 5, the oil phase is enriched in the center of the pipe, and the water distributed near the inner wall of the primary water removal pipe section 5 is released from the pipe wall. The first water removal hole 15 on the top flows out to realize the first-level oil-water separation, and the oil-water mixture after the first-level separation enters the second-level cyclone separation pipe section 12, and flows through the diversion effect of the second-level guide plate 13, and the rotation strength is enhanced , the water is further separated through the secondary water removal hole 11. the

By adjusting the ball valve 8 on the water outlet pipe section 6, monitor the sight numbers of the second flow meter 7 and the first flow meter 16, so that the sight numbers of the second flow meter 7 are about 50% of the first flow meter 16, and 50% of the first flow meter 16 is separated. % of water; in the present embodiment, the aperture d' of the primary dewatering hole 15 is 3mm. The aperture of the secondary dewatering port 11 is 2mm. After separation, the remaining 50% of the oil-water mixture is transported to the platform or wellhead for fine separation. the

The oil content of the reinjected water after treatment by this equipment is less than 1000ppm, which meets the treatment standard of the national underground or seabed underwater treatment system. the

Application example one

In the above technical scheme, the diameter of the first-stage liquid inlet pipe section 1 is 50mm, the diameters of the two end faces of the gradual expansion pipe section 2 are 50mm and 75mm respectively, the pipe diameter of the first-stage swirl generation pipe section 3 is 75mm, and the first-stage water removal pipe section The diameters of the two end faces of 5 are 75mm and 50mm respectively, and there are four first-stage guide vanes 4, and the included angle θ between the major axis of the first-stage guide vane and the cross-section of the first-stage swirl flow generating pipe section 3 is 45°, and the short axis The included angle α with the cross section of the first-stage swirl flow generating pipe section 3 is 0°, the pipe diameter of the second-stage swirl flow separation pipe section 12 is 50 mm, the number of the second-stage flow guide vanes is 3 pieces, and the long axis of the second-stage flow guide vanes The included angle θ with the cross-section of the primary swirl generation pipe section 3 is 50°, the included angle α between the short axis and the cross-section of the secondary swirl flow generated pipe section 4 is 0°, and the diameter of the outlet pipe section 6 is 50 mm. The aperture of the first-level water removal hole 15 is 3mm, and the first-level water removal hole has 5 cross-sections, which are evenly distributed in the first-level water removal pipe section 5 . The aperture of the secondary water removal hole is 2 mm, and a total of 5 sections are opened in the secondary water removal hole. the

The length of the first-stage liquid inlet pipe section 1 is 100mm, the length of the gradual expansion pipe section 2 is 150mm, and the length of the first-stage swirl flow generation pipe section 3 is 750mm. place. The thickness of the primary deflector 4 is 2 mm, and the length of the primary water removal pipe section 5 is 200 mm. The length of the secondary cyclone separation pipe section 12 is 1000 mm, and the secondary flow deflector is installed at a distance of 100 mm from the inlet of the secondary cyclone separation pipe section 12 . The first row of secondary water removal holes is opened at a distance of 500mm from the deflector, and is evenly opened. the

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention. the

Claims (2)

1. a duct type two-stage water conservancy diversion flap-type oil water separator, is characterized in that, comprising: the one-level feed liquor pipeline section connected successively, flaring pipeline section, one-level eddy flow generate pipeline section, one-level dewaters pipeline section and secondary cyclonic separation pipeline section; Wherein, described one-level eddy flow generation pipeline section and secondary cyclonic separation pipeline section all comprise the constant tilt flow deflector of more than 2 mounted thereto; All offer on described one-level dewaters pipeline section and secondary cyclonic separation pipeline section more than one group except water hole;

One-level feed liquor pipeline section is equipped with first-class gauge; What dewater pipeline section and secondary cyclonic separation pipeline section in one-level is outside equipped with cylinder except the pipeline section between water hole, and described cylinder is for holding the liquid of discharging except water hole except water hole and secondary from described one-level; Described cylinder is connected with water outlet pipeline section orthogonal with it, water is discharged by water outlet pipeline section, water outlet pipeline section is equipped with elbow, make the outlet of outlet pipe section and to carry out flow path direction parallel, water outlet pipeline section is equipped with second gauge and ball valve, is accounted for the percentage of one-level feed liquor pipeline flow by the flow regulating ball valve to control to fall from the outlet manifold of water outlet pipeline section;

The flow deflector being arranged on described one-level eddy flow generation pipeline section is one-level flow deflector, and the circumference that described one-level flow deflector generates pipeline section along described one-level eddy flow is uniform, and generates the axially stacked successively of pipeline section at described one-level eddy flow; The flow deflector being arranged on described secondary cyclonic separation pipeline section is secondary flow deflector, and described secondary flow deflector is uniform along the circumference of described secondary cyclonic separation pipeline section, and stacked successively in the axis of described secondary cyclonic separation pipeline section;

Described one-level flow deflector is half elliptic; Described one-level flow deflector is 4, and the angle theta that the major axis of described one-level flow deflector and described one-level eddy flow generate the cross section of pipeline section is 45 °, and the angle α that the minor axis of described one-level flow deflector and described one-level eddy flow generate the cross section of pipeline section is 0 °; Described secondary flow deflector is half elliptic; Described secondary flow deflector is 3, and the angle β of the major axis of described secondary flow deflector and the cross section of described secondary cyclonic separation pipeline section is 50 °, and the angle Ф of the minor axis of described secondary flow deflector and the cross section of described secondary cyclonic separation pipeline section is 0 °;

Offer on described one-level dewaters pipeline section except water hole be that one-level removes water hole, described one-level except the dewater inwall of pipeline section of the outer circumference surface in water hole and described one-level tangent, the aperture d' that described one-level removes water hole is: d'≤bD-c α D, wherein, described b, c are constant, D is that described one-level dewaters the diameter of equipped at outlet port of pipeline section, and α is the entrance oil content of described duct type two-stage water conservancy diversion flap-type oil water separator;

Described secondary cyclonic separation pipeline section is offered except water hole be that secondary removes water hole, described secondary except the inwall of the outer circumference surface in water hole and described secondary cyclonic separation pipeline section tangent, the aperture d' that described secondary removes water hole is: d'≤bD-0.5c α D, wherein, described b, c are constant, D is the diameter of secondary cyclonic separation pipeline section, and α is the entrance oil content of described duct type two-stage water conservancy diversion flap-type oil water separator.

2. apply a method for duct type two-stage water conservancy diversion flap-type oil water separator as claimed in claim 1, comprising:

By the oil well liquid-producing of oil concentration between 5%-20%, with 15m ³the flow of/h, is input to one-level feed liquor pipeline section, by described first-class gauge record entry flow;

Ball valve on adjusting water outlet pipeline section, monitoring second gauge and first-class gauge look number, make first-class gauge look number at about 50% of second gauge, to separate the water of about 50%.