CN111206913A - Underground double-vortex type rotational flow oil-water separator - Google Patents
Underground double-vortex type rotational flow oil-water separator Download PDFInfo
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- CN111206913A CN111206913A CN202010174334.6A CN202010174334A CN111206913A CN 111206913 A CN111206913 A CN 111206913A CN 202010174334 A CN202010174334 A CN 202010174334A CN 111206913 A CN111206913 A CN 111206913A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
Abstract
The embodiment of the invention relates to an underground double-vortex type rotational flow oil-water separator, which utilizes underground rotational flow oil-water separation equipment based on a high-speed rotational flow principle. When oil and water are pre-divided, two phases of oil and water move in the same axial direction in the rotational flow field, and the mixing is less than that of the two phases of rotational flow movement in opposite axial directions, so that the separation effect is better and the precision is higher; when the oily sewage is treated, the rotational flow strength is improved by using the slender cone, so that the oil content of the separated water phase is lower. Compared with the traditional gravity settling equipment, the gravity settling equipment has higher treatment effect and less occupied space, and is physical separation equipment with application prospect.
Description
Technical Field
The embodiment of the invention relates to the technical field of oil-water separation equipment, in particular to an underground double-vortex type cyclone oil-water separator.
Background
In the fields of petrifaction, environmental protection and the like, oil-water separation equipment is important production equipment, and separation technology is of great importance to industrial development. Particularly, as the development of the oil field enters the middle and later stages, the water content is sharply increased even to more than 95%, a large amount of water is lifted to the ground and then separated to reach the standard, and the water is discharged or reinjected, which relates to a series of costs, so that the oil field is close to the economic exploitation limit, and how to reduce the exploitation cost is realized is very important for the oil field. On the background, a downhole oil-water separator is adopted in a limited space to separate oil-water mixed liquid at the bottom of the well and ensure that the separated water reaches the standard and is discharged, so that the separation is challenging; moreover, because the cost involved in underground oil-water separation is higher, the method has a better application prospect in a high-yield oil well, and the treatment of high-yield crude oil mixed liquid in a limited space is a difficult problem.
The currently used underground oil-water separators are mainly divided into three types, one is an oil-water separator based on the gravity separation principle, the other is a hydrocyclone based on the centrifugal separation principle, and the other is a membrane separation principle based on selective permeability.
For example, CN201720360554.1, which utilizes the gravity principle to perform downhole oil-water separation, is generally applied to onshore oil wells with small single well yield;
for example, CN201420199799.7, it applies a traditional hydrocyclone for treating oily sewage downhole, and uses a plurality of hydrocyclones connected in parallel, so that the produced liquid of oil well will flow through a series of elbows and cause the change of flow direction before entering the hydrocyclone, and the sharp change of flow direction will break the oil drops into small oil drops to deteriorate the oil-water separation effect;
such as CN201611198617.4, which utilizes a hydrophobic membrane for oil-water separation, this method is generally applied in small-yield oil wells, and the back flushing is complicated. Therefore, the development of the underground oil-water separation method which has high treatment capacity, is easy to operate and has higher separation efficiency is of great significance to the exploitation of oil fields in the middle and later periods.
Disclosure of Invention
The embodiment of the invention provides an underground double-vortex type rotational flow oil-water separator, which is used for primarily separating oil drops with larger particle sizes in a crude oil mixed solution by utilizing double homodromous rotational flows and deeply separating underground oil-water by utilizing double reverse rotational flows.
The application embodiment provides a pair of vortex type whirl oil water separator in pit includes: a double homodromous swirler and a double reverse swirler;
the double equidirectional cyclone receives a first oil-water mixture through an inlet pipe arranged at one end of the double equidirectional cyclone, so that the first oil-water mixture enters the double equidirectional cyclone and forms a rotational flow through a rotational flow converter arranged in the double equidirectional cyclone, and the first oil-water mixture is subjected to primary separation to obtain a first oil phase and a second oil-water mixture;
the first oil phase moves towards the center of the double equidirectional cyclone and is discharged through a first rich oil outlet pipe arranged at the other end of the double equidirectional cyclone, and the second oil-water mixture moves towards the wall surface of the double equidirectional cyclone, flows into the double reverse cyclone through the first rich water outlet pipe of the double equidirectional cyclone and forms a rotational flow in a conical section in the double reverse cyclone, so that the second oil-water mixture is subjected to secondary separation.
In one possible embodiment, the dual co-rotating cyclones further comprise: a swirl pipe section;
one end of the rotational flow pipe section is connected with the inlet pipe through a gradual change pipeline, the rotational flow converter is arranged inside the rotational flow pipe section and is adjacent to the gradual change pipeline, an opening is formed in the other end of the rotational flow pipe section, and the first rich oil outlet pipe extends out of the rotational flow pipe section through the opening and is used for discharging the first oil phase.
In one possible embodiment, the first water-rich outlet pipe is arranged tangentially to the swirl pipe section, and the tangential direction of the first water-rich outlet pipe and the swirl pipe section is the same as the swirl flow direction in the swirl pipe section.
In one possible embodiment, the cyclone converter comprises: a rod body; the both ends of the body of rod are smooth transition point column structure, the middle part of the body of rod is the cylinder, be equipped with the multiunit water conservancy diversion piece in the middle part of the body of rod, the water conservancy diversion piece include with the parallel straight line structure of spiral-flow pipe section axial lead, and with the arc structure of straight line structural connection, with this will the smooth transition of first oil water mixture becomes the whirl that has circumferential velocity.
In a possible embodiment, a first flow meter for recording the flow rate of the first oil-water mixture is arranged on the inlet pipe.
In one possible embodiment, the double reverse swirler comprises: a cylindrical body and a conical section;
the top of the column body is connected with the first water-rich outlet pipe, the bottom of the column body is connected with the conical section, and the second oil-water mixture flows into the conical section and forms a rotational flow through the conical section, so that secondary separation of the oil-water mixture is realized to obtain a second oil phase and a water phase;
and the second oil moves towards the center of the double reverse cyclone, flows into the first oil-rich outlet pipe through a second oil-rich outlet pipe arranged at the top end of the column body, and moves towards the wall surface of the double reverse cyclone and is discharged from a second water-rich outlet pipe arranged at the bottom of the conical section.
In one possible embodiment, the taper of the tapered section is less than 15 °.
In one possible embodiment, the first rich oil outlet pipe is provided with a valve for controlling the oil phase flow and a second flow meter for recording the total oil phase flow.
Compared with the traditional hydrocyclone, the underground double-vortex type cyclone oil-water separator comprehensively utilizes double cocurrent cyclones to carry out oil-water pre-separation and double reverse cyclone treatment on underground fine oily sewage. When oil and water are pre-divided, two phases of oil and water move in the same axial direction in the rotational flow field, and the mixing is less than that of the two phases of rotational flow movement in opposite axial directions, so that the separation effect is better and the precision is higher; when the oily sewage is treated, the rotational flow strength is improved by using the slender cone, so that the oil content of the separated water phase is lower. Compared with the traditional gravity settling equipment, the gravity settling equipment has higher treatment effect and less occupied space, and is physical separation equipment with application prospect.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
FIG. 1 is a schematic diagram of a downhole double-vortex type cyclone oil-water separator according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a cyclone converter provided in an embodiment of the present application;
notation of the reference numerals: 1-an inlet pipe, 2-a first flowmeter, 3-a gradual change pipeline, 4-a swirl pipe section, 5-a swirl converter, 6-a double cocurrent cyclone, 7-a first rich oil outlet pipe, 8-a second flowmeter, 9-a valve, 10-a second rich oil outlet pipe, 11-a first rich water outlet pipe, 12-a double cocurrent cyclone, 13-a column, 14-a conical section and 15-a second rich water outlet pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, technical methods in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any creative effort, shall fall within the scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components in a certain posture, the motion situation, etc., and if the certain posture is changed, the directional indications are changed accordingly.
Fig. 1 is a schematic view of a downhole double-vortex type cyclone oil-water separator provided in an embodiment of the present application, and as shown in fig. 1, the downhole double-vortex type cyclone oil-water separator provided in the embodiment of the present application includes: a double cocurrent cyclone 6 and a double reverse cyclone 12;
the dual-equidirectional cyclone 6 receives the first oil-water mixture through the inlet pipe 1 arranged at one end of the dual-equidirectional cyclone 6, so that the first oil-water mixture enters the dual-equidirectional cyclone 6 and forms a rotational flow through the rotational flow converter 5 arranged in the dual-equidirectional cyclone 6, and the first oil-water mixture is subjected to primary separation to obtain a first oil phase and a second oil-water mixture;
it can be understood that due to the density difference of oil and water in the rotational flow, the oil in the first oil-water mixture moves towards the center of the double homodromous cyclone and then is enriched, and the first oil phase enriched in the central area of the double homodromous cyclone flows out from the first rich oil outlet pipe 7 at the center of the double homodromous cyclone; the remaining oil-water mixture (second oil-water mixture) moves to the wall surface of the wall of the double co-rotating cyclone under the action of centrifugal force, finally flows out through the first water-rich outlet pipe 11 and enters the double reverse cyclone 12, and the second oil-water mixture is subjected to secondary separation by the double reverse cyclone 12.
Through the design, the oil-water mixture moves along the same axial direction in the rotational flow field of the double homodromous cyclones, and compared with the oil-water mixture, the oil-water mixture has less mixing along two phases of rotational flow movement in opposite axial directions, better separation effect and higher precision.
The dual cocurrent cyclone converter 6 in this embodiment further comprises: the cyclone tube section 4, the one end of cyclone tube section 4 is connected with inlet tube 1 through gradual change pipeline 3, and cyclone converter 5 sets up inside cyclone tube section 4, and sets up adjacent with gradual change pipeline 3, and the other end of cyclone tube section 4 is equipped with the opening, and first rich oil outlet pipe 7 extends the cyclone tube section through the opening for discharge first oil phase.
It should be noted that the tapering duct 4 may be a tapering duct or a diverging duct, in order to convert the diameter of the inlet pipe 2 into a pipe diameter suitable for generating the swirling flow, and the pipe diameter of the duct generally does not exceed 2 times of the diameter of the inlet pipe, and specifically may be determined according to the structural design of the swirling flow converter, and the design principle is to make the area of the cross-sectional passage flowing through the swirling flow converter 1/3-1/4 of the cross-sectional area of the duct of the inlet duct.
The swirling converter 5 in the present embodiment includes: a rod body 23; both ends of the rod body 23 are smooth transition pointed structures, the middle part of the rod body is a cylinder, a plurality of groups of flow deflectors 24 are arranged on the middle part of the rod body, each flow deflector comprises a linear structure parallel to the axial lead of the rotational flow pipe section and an arc structure connected with the linear structure, and the smooth transition of the first oil-water mixture can be changed into rotational flow with circumferential speed through the structure.
The first rich oil outlet pipe 7 in this embodiment passes through the other end of the swirl pipe section 4 and is coaxial with the swirl pipe section 4, the diameter of the first rich oil outlet pipe 7 is designed according to the inlet light phase fraction, the insertion depth is near the lowest end of the intersection line of the first rich water outlet pipe 11 and the swirl pipe section 4, and the distance from the swirl converter 5 is generally more than 500 mm.
In this embodiment, the first rich water outlet pipe 11 is arranged tangentially to the swirl pipe section 4, and the tangential direction of the first rich water outlet pipe 11 and the swirl pipe section 4 is the same as the swirl flow direction in the swirl pipe section 4. The diameter of the first water-rich outlet pipe 11 is determined according to the content of the heavy phase in the inlet, and the ratio of the area of the water phase outlet pipe to the area of the cyclone pipe section 4 is basically ensured to be equal to the content of the water phase in the inlet.
The inlet pipe 1 in this embodiment is provided with a first flow meter 2 for recording the flow rate of the first oil-water mixture.
The double reverse swirler 12 in this embodiment comprises: a cylinder 13 and a conical section 14; the top of the column body 13 is connected with the first water-rich outlet pipe 11, the bottom of the column body 13 is connected with the conical section 14, and the second oil-water mixture flows into the conical section 14 and forms a rotational flow through the conical section 14, so that secondary separation of the oil-water mixture is realized to obtain a second oil phase and a water phase;
it can be understood that after the separated low oil-containing sewage (i.e. the second oil-water mixture) enters the double-reverse rotational flow body 12, a strong rotational flow is formed in the cylinder 13 and the conical section 14, and the water phase with high density in the rotational flow field moves towards the vicinity of the wall surface and moves downwards to flow out from the second rich water outlet pipe 15 and is injected back into the stratum under the density difference of the oil phase and the water phase; the oil phase with low density (namely the second oil phase) moves to the center and moves upwards to flow out from the second rich oil outlet pipe 10, and then flows to the first rich oil outlet pipe 7 in a combined mode, and finally flows out of the underground double-vortex type cyclone oil-water separator after being metered by the flowmeter 9 to enter an oil well.
In addition, the diameter of the column body 13 in the embodiment is generally 0.75 times of that of the cyclone tube section 4, the taper of the tapered section 14 in the embodiment is less than 15 degrees, and the diameter of the second rich oil outlet pipe 10 is generally 0.25 times of that of the column body 13, so that the oil content of the separated water phase is lower by utilizing the slender tapered section to improve the swirl strength.
In the embodiment, the first rich oil outlet pipe 7 is provided with a valve 9 for controlling the flow of the oil phase and a second flow meter 8 for recording the flow of the oil phase, and when the ratio of the second flow meter 8 to the first flow meter 2 is twice of the oil content of the first oil-water mixture, the working performance of the downhole double-vortex type rotational flow oil-water separator is optimal.
The following are illustrative of the preferred embodiments provided herein:
the daily production of the West river 23-1-A01H well in China offshore at the middle and later production periods reaches 2432m3In the oil well with the oil content of the produced liquid being 5%, the radial dimension of the well bore is less than 250mm, and the radial dimension of the separator is less than 200mm in total. In the technical scheme, the pipe diameter of the inlet pipe is 80mm, and the length of the inlet pipe is 200 mm; the pipe diameters of two ends of the gradual change pipeline are respectively 80mm, 100mm and 200mm in length; the pipe diameter of the cyclone pipe section is 100mm, and the length of the cyclone pipe section is 1000 mm;
the cyclone converter is arranged at a position 200mm away from the inlet of the cyclone pipe section, the number of the guide vanes is 3, the length L of a straight section of each guide vane is 10mm, the radius of each arc is 117mm, the included angle α between a straight line tangent to each arc and the cross section of the cyclone pipe section is 150 degrees, the length L1 of the whole guide vane is 100mm, the diameter of the part, attached to each guide vane, on the rod body is 50mm, the length of an ellipse at each end is 90mm, the upper end of each cyclone pipe section is sealed by a flange, the diameter of a first rich oil outlet pipe is 35mm, the diameter of a first rich water outlet pipe is 45mm, the length of the first rich water outlet pipe is 75mm, the sealing position of the flange at the upper end of the cyclone pipe section of the first rich water outlet pipe is 5mm, the insertion depth of the first rich oil outlet pipe is 55mm, the diameter of a cylinder is 50mm and 100mm high, the taper of the cone section is 10 degrees, the diameter of a circular pipe of a second rich oil outlet pipe with the diameter of 20 mm.
The underground double-vortex type cyclone oil-water separator is constructed on the basis of the embodiment, and the daily treatment capacity is 2000-2500m3And d, when the oil well is applied to the oil well, 50 percent of water can be removed, the oil content in the water is lower than 600ppm, and the rest production fluid is pumped to a platform for advanced treatment.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments described above as examples. It will be appreciated by those skilled in the art that various equivalent changes and modifications can be made without departing from the spirit and scope of the invention, and it is intended to cover all such modifications and alterations as fall within the true spirit and scope of the invention.
Claims (8)
1. A down-hole double vortex type cyclone oil-water separator is characterized by comprising: a double homodromous swirler and a double reverse swirler;
the double equidirectional cyclone receives a first oil-water mixture through an inlet pipe arranged at one end of the double equidirectional cyclone, so that the first oil-water mixture enters the double equidirectional cyclone and forms a rotational flow through a rotational flow converter arranged in the double equidirectional cyclone, and the first oil-water mixture is subjected to primary separation to obtain a first oil phase and a second oil-water mixture;
the first oil phase moves towards the center of the double equidirectional cyclone and is discharged through a first rich oil outlet pipe arranged at the other end of the double equidirectional cyclone, and the second oil-water mixture moves towards the wall surface of the double equidirectional cyclone, flows into the double reverse cyclone through the first rich water outlet pipe of the double equidirectional cyclone and forms a rotational flow in a conical section in the double reverse cyclone, so that the second oil-water mixture is subjected to secondary separation.
2. The downhole twin scroll cyclone oil-water separator according to claim 1, wherein the twin cocurrent cyclone further comprises: a swirl pipe section;
one end of the rotational flow pipe section is connected with the inlet pipe through a gradual change pipeline, the rotational flow converter is arranged inside the rotational flow pipe section and is adjacent to the gradual change pipeline, an opening is formed in the other end of the rotational flow pipe section, and the first rich oil outlet pipe extends out of the rotational flow pipe section through the opening and is used for discharging the first oil phase.
3. The downhole twin scroll cyclone oil-water separator according to claim 2 wherein the first water-rich outlet pipe is arranged tangentially to the cyclone pipe section and the tangential direction of the first water-rich outlet pipe to the cyclone pipe section is the same as the direction of the cyclone flow in the cyclone pipe section.
4. The downhole twin scroll cyclonic oil and water separator as claimed in claim 2, wherein the cycloconverter comprises: a rod body;
the both ends of the body of rod are smooth transition point column structure, the middle part of the body of rod is the cylinder, be equipped with the multiunit water conservancy diversion piece in the middle part of the body of rod, the water conservancy diversion piece include with the parallel straight line structure of spiral-flow pipe section axial lead, and with the arc structure of straight line structural connection, with this will the smooth transition of first oil water mixture becomes the whirl that has circumferential velocity.
5. The downhole twin scroll cyclone oil-water separator according to claim 2 wherein the inlet pipe is provided with a first flow meter for recording the flow rate of the first oil-water mixture.
6. The downhole twin scroll cyclone oil-water separator according to claim 2 wherein the double reverse cyclone comprises: a cylindrical body and a conical section;
the top of the column body is connected with the first water-rich outlet pipe, the bottom of the column body is connected with the conical section, and the second oil-water mixture flows into the conical section and forms a rotational flow through the conical section, so that secondary separation of the oil-water mixture is realized to obtain a second oil phase and a water phase;
and the second oil moves towards the center of the double reverse cyclone, flows into the first oil-rich outlet pipe through a second oil-rich outlet pipe arranged at the top end of the column body, and moves towards the wall surface of the double reverse cyclone and is discharged from a second water-rich outlet pipe arranged at the bottom of the conical section.
7. The downhole twin scroll cyclonic oil and water separator as claimed in claim 6, wherein the taper of the tapered section is less than 15 °.
8. The downhole twin scroll cyclone oil-water separator according to claim 6 wherein the first rich oil outlet pipe is provided with a valve for controlling the flow of the oil phase and a second flow meter for recording the total flow of the oil phase.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010174334.6A CN111206913A (en) | 2020-03-13 | 2020-03-13 | Underground double-vortex type rotational flow oil-water separator |
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| CN202010174334.6A CN111206913A (en) | 2020-03-13 | 2020-03-13 | Underground double-vortex type rotational flow oil-water separator |
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Cited By (1)
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| CN115142833A (en) * | 2022-07-22 | 2022-10-04 | 中国科学院力学研究所 | Underground double-vortex type rotational flow oil-water separator |
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| CN115142833A (en) * | 2022-07-22 | 2022-10-04 | 中国科学院力学研究所 | Underground double-vortex type rotational flow oil-water separator |
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Application publication date: 20200529 |