CN219174253U

CN219174253U - Gas-mixing cyclone separator for pretreatment of oilfield sewage

Info

Publication number: CN219174253U
Application number: CN202223206241.0U
Authority: CN
Inventors: 郭宏; 吴广涛; 魏涛; 王雪英; 王汝广; 翟艳红
Original assignee: Sinopec Zhongyuan Petroleum Exploration Bureau Co ltd Water Branch; China Petroleum and Chemical Corp
Current assignee: Sinopec Zhongyuan Petroleum Exploration Bureau Co ltd Water Branch; China Petroleum and Chemical Corp
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-06-13
Anticipated expiration: 2032-11-30

Abstract

The utility model relates to a gas-mixing cyclone separator for pretreatment of oilfield sewage, which comprises a jet ejector (3) and a cyclone separator (5), wherein the cyclone separator (5) comprises a cylinder body and a spiral pipe column (57) arranged in the cylinder body, a notch channel is formed in the spiral pipe column (57), the notch channel penetrates through the spiral pipe column (57) along the tangential direction of rotation of the spiral pipe column (57), and a notch (58) is formed in the outer surface of the spiral pipe column (57) in the notch channel. The cyclone separator can rise through high-speed spiral of water flow, and realize three-phase layering of oil stain, water and solid particles by utilizing the inconformity of the centrifugal force and the density of various impurities, and then realize three-phase synchronous separation in one device through the notch of the spiral pipe column.

Description

Gas-mixing cyclone separator for pretreatment of oilfield sewage

Technical Field

The utility model relates to oilfield sewage treatment equipment, in particular to a gas-mixing cyclone separator for oilfield sewage pretreatment.

Background

Oilfield sewage treatment is generally classified into pretreatment, secondary treatment, and tertiary treatment, wherein the secondary treatment mainly uses methods of filtration, sedimentation, floatation, etc., and uses a plurality of devices such as a filter, a sedimentation tank, a floatation machine, etc., in which solid mineral particles (silt), suspended matters (sludge and sludge chips) and oils (residual oil) etc. in oilfield sewage are removed in a plurality of steps in sequence, for example, an "oil separation" → "filtration" process or an "oil separation" → "floatation or rotational flow deoiling" → "filtration" process in the prior art, and these prior arts are essentially to remove the oil and suspended matters in the sewage step by step.

However, in actual production, the conventional oil separation equipment, flotation equipment and filtering equipment occupy larger space when in implementation, and the step-by-step implementation is not easy to coordinate with each other, so that the primary treatment effect can only reach 90% of the removal rate in actual production, and the collection of residual oil in the oil separation and flotation processes and the cleaning of filter materials in the filtering process are all required to consume larger manpower and material resources. Therefore, the oil separation of the oilfield sewage treatment equipment and the residual oil collection workload and difficulty of the floatation process in the prior art are large, and the content of impurities such as residual oil, suspended matters, solid mineral particles and the like in oilfield sewage is difficult to effectively reduce.

Disclosure of Invention

The utility model aims to provide a gas-mixing cyclone separator for oilfield sewage pretreatment, which is used for solving the technical problem that the prior art is difficult to effectively reduce the impurity content of residual oil, suspended matters, solid mineral particles and the like in oilfield sewage.

The utility model relates to a gas-mixing cyclone separator for pretreatment of oilfield sewage, which comprises an ejector and a cyclone separator, wherein the ejector is provided with a water inlet, a gas inlet and an outlet for outputting oilfield sewage containing bubbles; the cyclone separator is provided with a sewage inlet, a sewage drain, a water outlet and an oil-gas mixing outlet, wherein the sewage inlet is connected with the outlet, the sewage drain is arranged at the bottom, the water outlet is arranged at the upper part, and the oil-gas mixing outlet is arranged at the top; the cyclone separator comprises a cylinder body and a spiral pipe column arranged in the cylinder body, wherein the spiral pipe column is formed by a hollow pipe column extending from bottom to top along a spiral curve around a central axis, two ends of the spiral pipe column are respectively connected with a sewage inlet and a water outlet, the outer surface of the spiral pipe column surrounds the central axis to form an inner central hole and an outer peripheral surface, the central hole is communicated with an oil-gas mixing outlet upwards, and an outer channel which is communicated with a sewage drain downwards is formed between the outer peripheral surface of the spiral pipe column and the cylinder body; the incision passageway has been seted up on the spiral tubular column, and the incision passageway link up the spiral tubular column along the rotatory tangential direction of spiral tubular column, and the incision passageway has the incision on the surface of spiral tubular column, and the incision passageway includes: the incision is towards the centre bore, the interior incision passageway that is used for discharging oil gas mixture of intercommunication centre bore, and the incision is towards outside passageway, the external incision passageway that is used for discharging silt of intercommunication outside passageway.

The utility model provides a gas-mixing cyclone separator for oilfield sewage pretreatment, which has the beneficial effects that: the cyclone separator can rise through the high-speed spiral of the water flow, and utilizes the centrifugal force to be inconsistent with the density of various impurities, thereby realizing three-phase layering of greasy dirt, water and solid particles, and realizing three-phase synchronous separation in one device through the incision of the spiral pipe column. Therefore, the utility model can greatly reduce the impurity content of residual oil, suspended matters (oil sludge and oil residue scraps), solid mineral particles (sand) and the like in the oilfield sewage, reduce the operation load of the conventional oilfield sewage treatment facilities, reduce the residual oil collection workload and difficulty of oil separation and flotation processes, prolong the filter material cleaning period of the filtering facilities, greatly improve the oilfield sewage treatment effect, improve the oilfield reinjection water quality and promote oilfield water injection development.

Further, the spiral pipe column bypasses from bottom to top to form a plurality of layers of ring layer pipe columns distributed from bottom to top, and the notch channel is formed on the upper end ring layer pipe column positioned at the upper end of the spiral pipe column and each ring layer pipe column positioned at the upper part of the spiral pipe column and close to the upper end ring layer pipe column.

Further, each layer of ring layer pipe column is provided with more than two incision channels.

Further, the device also comprises an oilfield sewage inlet pipe, and the oilfield sewage inlet pipe is connected with a water inlet of the ejector through a water inlet switch valve.

Further, the air inlet pipe is connected with the air inlet of the ejector through the air flow control valve and the one-way valve. The air inlet of the ejector is provided with the flow control valve and the uniflow valve, so that the air inlet amount can be effectively controlled, and sewage can be prevented from flowing out when the flow is too low.

Further, the oil-gas mixing outlet is connected with an oil-gas mixing flow control valve. The flow control valve and the oil-gas mixing flow control valve arranged at the gas inlet can reasonably adjust the air inflow and the mixed oil-gas discharge amount, thereby ensuring the removal of residual oil and greasy dirt to the maximum extent and the highest benefit.

Further, an annular gap is formed between the outer peripheral surface of the spiral pipe column and the barrel, and the outer channel is formed by the annular gap.

Further, the section of the tubular column is rectangular.

Further, a sand settling collecting hopper communicated with the sewage outlet is arranged at the bottom of the cylinder body of the cyclone separator. The sand settling collecting hopper can effectively settle sand and collect sand, improve the sewage discharge efficiency and reduce the sewage ratio in mud.

Further, the sand sediment collecting hopper is in a conical shape with a large upper part and a small lower part.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic view of the cyclone separator of FIG. 1;

FIG. 3 is a schematic illustration of a cut-out provided in a coiled tubing string in an embodiment of the present utility model;

in the figure:

1. an oilfield sewage inlet pipe; 2. a water inlet switch valve; 3. a jet device; 4. a jet flow switch valve; 5. a cyclone separator; 6. a blow-down valve; 7. a water outlet switch valve; 8. an air flow control valve; 9. a single flow valve; 10. an oil-gas mixing flow control valve; 51. a sewage inlet; 52. a sewage outlet; 53. a sand sediment collection hopper; 54. a water outlet; 55. an oil-gas mixing outlet; 56. an oil gathering area; 57. a spiral pipe column; 58. and (5) cutting.

Detailed Description

An embodiment of the gas-mixing cyclone separator for pretreatment of oilfield sewage, as shown in fig. 1-3, comprises an ejector 3 and a cyclone separator 5.

The ejector 3 is for mixing bubbles formed by sucked air into a high-speed water flow formed by oilfield sewage, and the ejector 3 has a water inlet for inputting oilfield sewage, a gas inlet for sucking the inputted air, and an outlet for outputting oilfield sewage containing bubbles. The cyclone separator 5 is provided with a sewage inlet 51, a sewage drain 52, a water outlet 54 and an oil-gas mixing outlet 55, the oilfield sewage inlet pipe 1 is connected with the water inlet of the ejector 3 through the water inlet switch valve 2, the air inlet pipe is connected with the air inlet of the ejector 3 through the air flow control valve 8 and the one-way valve, and the outlet of the ejector 3 is connected with the sewage inlet 51 of the cyclone separator 5 through the jet switch valve 4. The air flow control valve 8 and the uniflow valve 9 are arranged at the air inlet of the ejector 3, and the flow rate of the air entering the ejector 3 can be regulated through the flow control valve, so that the removal rate of residual oil, oil residue and oil sludge is ensured. The ejector 3 is selected according to the conventional treatment capacity of the oilfield sewage and the matched cyclone separator 5, can be effectively matched and generate high-speed water flow to form negative pressure suction air, so that a large number of bubbles are formed to be mixed with the oilfield sewage, and the bubbles are adhered and adsorbed on residual oil, oil residue and oil sludge, so that the oilfield sewage can be rapidly layered in the follow-up cyclone separator 5 under the action of cyclone centrifugal force.

The cyclone separator 5 comprises a cylinder body and a spiral pipe column 57 arranged in the cylinder body, and a sand settling collection hopper 53 which is in a conical shape and is big in top and small in bottom is arranged at the bottom of the cylinder body of the cyclone separator 5.

The spiral pipe column 57 is formed by a pipe column with a rectangular cross section around a central axis from bottom to top along a spiral curve, an inlet of the spiral pipe column 57 is positioned at the lower part of the cyclone separator 5 and is connected with the sewage inlet 51, an outlet of the spiral pipe column 57 is positioned at the upper part of the cyclone separator 5 and is connected with the water outlet 54, the outer surface of the spiral pipe column 57 surrounds the central axis to form a central hole positioned inside the spiral pipe column 57 and an outer circumferential surface positioned outside the spiral pipe column 57, the central hole and the outer circumferential surface are both cylindrical, so that the spiral pipe column 57 constructs an 'inner cylinder and an outer cylinder' structure in the cyclone separator 5, the inner cylinder refers to a hollow inner cylinder formed by the central hole, and the outer cylinder is formed by the outer circumferential surface. The gap between the outer peripheral surface of the spiral tube column 57 and the cylinder forms an outer passage, which is specifically an annular gap. The spiral pipe column 57 bypasses from bottom to top to form a multi-layer ring layer pipe column distributed from bottom to top, an upper end ring layer pipe column positioned at the upper end of the spiral pipe column 57 and each ring layer pipe column positioned at the upper part of the spiral pipe column 57 and close to the upper end ring layer pipe column are provided with a notch channel, the tangential direction of the notch channel, which is rotated along the spiral pipe column 57, penetrates through each ring layer pipe column so that fluid in the spiral pipe column 57 can be discharged, the notch channel is provided with a notch 58 on the outer surface of the spiral pipe column 57, the notch channel comprises an inner notch channel which is communicated with a central hole and an outer notch channel which is communicated with an outer channel and is used for discharging sediment, the notch 58 of the inner notch channel faces the central hole, the notch 58 of the outer notch channel faces the outer channel, and more than two notch channels are arranged on each ring layer pipe column.

The water outlet 54 of the cyclone separator 5 is connected with a water outlet switch valve 7, and the water outlet switch valve 7 is connected with a pipeline to a conventional sewage treatment process facility; the drain outlet 52 of the cyclone separator 5 is connected with a drain valve 6, and the drain valve 6 is connected with a drain pipeline to a sludge collecting tank; the oil-gas mixing outlet 55 of the cyclone separator 5 is connected with the oil-gas mixing flow control valve 10, and the oil-gas mixing flow control valve 10 is connected with an oil discharge pipeline to a dirty oil collecting tank.

When the embodiment of the utility model is used, the oilfield sewage enters the ejector 3 at a high speed through the water inlet switch valve 2, a negative pressure cavity is formed in the ejector 3, air enters the ejector 3 through the air flow control valve 8 and the uniflow valve 9 under the action of negative pressure and is fully mixed with the oilfield sewage, residual oil, oil residue and oil sludge particles in the oilfield sewage adsorb air small foam to form ultralow-density oil particles, and gas-water mixed liquid sprayed from the outlet of the ejector 3 enters the cyclone separator 5 through the jet switch valve 4 and is rapidly layered under the action of centrifugal force.

The lowest flow rate of the oilfield sewage entering the cyclone separator 5 is matched with the radius of an inner cylinder and an outer cylinder constructed by a spiral pipe column 57 selected by the cyclone separator 5, so that the centrifugal force formed in the spiral ascending process of the oilfield sewage can effectively separate three phases of residual oil, water and solid particles, and the cyclone decontamination effect is achieved.

The sewage rises from bottom to top along the spiral pipe column 57 of the cyclone separator 5 to form spiral water flow, solid particles are distributed on the outer layer of the spiral water flow under the action of centrifugal force in the upper layer of the ring layer pipe column, and light oil-gas mixture is distributed on the inner layer of the spiral water flow.

The ultra-low density oil particles enter the central hole along the tangential direction through the internal cutting channel, the residual oil, the oil residue and air bubble combination body and air bubbles float upwards after entering the central hole from the internal cutting 58, enter the oil collecting area 56 at the top of the cyclone separator 5, are discharged from the oil-gas mixing outlet 55 and are discharged to a dirty oil collecting tank through the oil-gas mixing flow control valve 10.

Solid mineral particles (silt) enter the external passage through the external cutting passage in the tangential direction, solid particles and sundries enter the external passage through the external cutting passage 58, sink under the action of gravity sedimentation and are gathered in the sediment collection hopper 53 at the bottom of the cyclone separator 5, are discharged through the drain outlet 52, and enter the sludge collection tank through the drain valve 6.

While the left treated oilfield sewage is discharged through the water outlet 54 and enters the conventional sewage treatment process facility through the water outlet switching valve 7.

In addition, the spiral pipe column in the above embodiment is formed by encircling a pipe column with a rectangular cross section, and in other embodiments of the present utility model, the pipe column with a rectangular cross section may be replaced by other shapes such as a circular cross section, an oval cross section, and the like. The embodiments which are formed by simple alternatives or obvious variants listed above or similar thereto also belong to the embodiments which implement the technical solutions of the utility model.

Claims

1. The gas-mixing cyclone separator for pretreatment of oilfield sewage is characterized by comprising an ejector (3) and a cyclone separator (5), wherein the ejector (3) is provided with a water inlet, a gas inlet and an outlet for outputting oilfield sewage containing bubbles; the cyclone separator (5) is provided with a sewage inlet (51) connected with the outlet at the lower part, a sewage outlet (52) at the bottom, a water outlet (54) at the upper part and an oil-gas mixing outlet (55) at the top; the cyclone separator (5) comprises a cylinder body and a spiral pipe column (57) arranged in the cylinder body, wherein the spiral pipe column (57) is formed by a hollow pipe column extending from bottom to top along a spiral curve around a central axis, two ends of the spiral pipe column (57) are respectively connected with a sewage inlet (51) and a water outlet (54), the outer surface of the spiral pipe column (57) surrounds the central axis to form an inner central hole and an outer peripheral surface on the outer side, the central hole is communicated with an oil-gas mixing outlet (55) upwards, and an outer channel which is communicated with a sewage drain outlet (52) downwards is formed between the outer peripheral surface of the spiral pipe column (57) and the cylinder body; cut passageway has been seted up on spiral tubular column (57), and cut passageway link up spiral tubular column (57) along the tangential direction of spiral tubular column (57) rotation, and cut passageway has incision (58) on the surface of spiral tubular column (57), and cut passageway includes: the notch (58) faces the central hole and an inner notch channel communicated with the central hole and used for discharging the oil-gas mixture, and the notch (58) faces the outer channel and an outer notch channel communicated with the outer channel and used for discharging sediment.

2. The gas-mixing cyclone separator for oilfield sewage pretreatment according to claim 1, wherein the spiral pipe column (57) bypasses from bottom to top to form a plurality of layers of ring pipe columns distributed from bottom to top, and the notch channel is formed on an upper end ring pipe column positioned at the upper end of the spiral pipe column (57) and each ring pipe column positioned at the upper part of the spiral pipe column (57) close to the upper end ring pipe column.

3. The oilfield wastewater pretreatment gas-mixed cyclone separator of claim 2, wherein each layer of the annular pipe column is provided with more than two notched passages.

4. The gas-mixing cyclone separator for oilfield sewage pretreatment according to claim 1, further comprising an oilfield sewage water inlet pipe (1), wherein the oilfield sewage water inlet pipe (1) is connected with a water inlet of the ejector (3) through a water inlet switch valve (2).

5. The gas-mixing cyclone separator for oilfield sewage pretreatment according to claim 1, further comprising an air inlet pipe, wherein the air inlet pipe is connected with the air inlet of the ejector (3) through an air flow control valve (8) and a one-way valve.

6. The gas-mixing cyclone separator for oilfield sewage pretreatment according to claim 5, wherein the gas-gas mixing outlet (55) is connected with a gas-gas mixing flow control valve (10).

7. A gas-mixing cyclone separator for pretreatment of oilfield sewage according to claim 1, wherein an annular gap is provided between the outer peripheral surface of the spiral pipe column (57) and the cylinder, and the outer passage is formed by the annular gap.

8. The oilfield wastewater pretreatment gas-mixed cyclone separator of claim 1, wherein the tubular string is rectangular in cross-section.

9. The gas-mixed cyclone separator for oilfield sewage pretreatment according to any one of claims 1 to 8, wherein a sand settling collection hopper (53) communicated with a sewage outlet (52) is arranged at the bottom of the cylinder of the cyclone separator (5).

10. A gas-mixed cyclone separator for oilfield sewage pretreatment according to claim 9, wherein said sand settling collection hopper (53) is tapered with a large upper part and a small lower part.