CN113818860B - Underground oil-water separation device and oil-water separation method - Google Patents
Underground oil-water separation device and oil-water separation method Download PDFInfo
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- CN113818860B CN113818860B CN202111210285.8A CN202111210285A CN113818860B CN 113818860 B CN113818860 B CN 113818860B CN 202111210285 A CN202111210285 A CN 202111210285A CN 113818860 B CN113818860 B CN 113818860B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 238000000926 separation method Methods 0.000 title claims abstract description 40
- 238000004062 sedimentation Methods 0.000 claims abstract description 85
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 34
- 239000007788 liquid Substances 0.000 claims description 19
- 229910052742 iron Inorganic materials 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 13
- 230000005684 electric field Effects 0.000 claims description 9
- 238000004581 coalescence Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/385—Arrangements for separating materials produced by the well in the well by reinjecting the separated materials into an earth formation in the same well
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses an underground oil-water separation device and an oil-water separation method, comprising a central tube, wherein a turbine generator is arranged in an opening at the upper end of the external central tube, a pulse generator is fixed on the central tube at the lower side of the generator, the power output end of the turbine generator is connected with the power input end of the pulse generator, a multi-cup equal-flow type oil-water separator is formed on the central tube at the lower side of the pulse generator, the multi-cup equal-flow type oil-water separator comprises a plurality of sedimentation cups, the upper edge and the lower edge of each sedimentation cup are respectively provided with a positive electrode and a negative electrode which directly encircle the edge of the sedimentation cup, all positive electrodes in the sedimentation cups are connected together through wires, and all negative electrodes in the sedimentation cups are connected together through wires. The device can promote the separation rate of oil and water for demulsification degree and the gathering of oil promote the oil-water separation ratio.
Description
Technical Field
The invention relates to the technical field of devices and methods for oil and gas field exploitation, in particular to an underground oil-water separation device and an oil-water separation method.
Background
Currently, most land oil fields enter a high water content stage, the oil-water extraction proportion is smaller and smaller, and a large amount of water causes the performance of each machine to generate a great load, so that the oil extraction cost investment is higher and higher. Thus, there is an urgent need for various methods for improving oil recovery or oil-water recovery ratio while treating a large amount of water. Injection and production in the same well is one of the methods for solving the problem.
The same well injection and production is to inject and produce simultaneously in the shaft of the same well, oil and water are separated under the combined action of the sucker rod, the production pump, the sealing piston, the packer, the injection pump and the separator, and a large amount of produced water is injected back into the stratum, so that the water consumption is saved.
The key of the oil-water separation under the same well injection production is the separation capacity of the oil-water separator, and the oil-water separator which is mature in the prior art can be divided into centrifugal cyclone type and gravity sedimentation type. The centrifugal cyclone separator has the advantages of higher separation speed, less oil-water ratio after separation than other methods, and great influence on the centrifugal cyclone separator due to oil-water density difference, oil-water viscosity difference, formation temperature and the like. The gravity sedimentation type separator has the advantages of high oil-water separation degree, simple structure, easy understanding of principle and convenient operation, and has the defects of low oil-water separation speed and low efficiency, and has higher requirements on conditions such as liquid speed, oil-water density difference, viscosity difference and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing an underground oil-water separation device which can improve the separation speed of oil and water, quicken the demulsification degree and the aggregation of oil and improve the oil-water separation ratio.
In order to solve the technical problems, the invention adopts the following technical scheme: an underground oil-water separation device is characterized in that: the device comprises an external central tube, a turbine generator is arranged in an opening at the upper end of the external central tube, a pulse generator is fixed on the central tube at the lower side of the generator, a power output end of the turbine generator is connected with a power input end of the pulse generator, the turbine generator is used for providing a working power supply for the pulse generator, a multi-cup equal-flow type oil-water separator is formed on the central tube at the lower side of the pulse generator, the multi-cup equal-flow type oil-water separator comprises a plurality of sedimentation cups, a positive electrode and a negative electrode directly encircle the edge of each sedimentation cup are respectively arranged at the upper part and the lower edge of each sedimentation cup, all positive electrodes in the sedimentation cups are connected together through wires, all negative electrodes in the sedimentation cups are connected together through wires, and positive and negative output ends of the pulse generator are respectively connected with the positive electrodes and the negative electrodes.
The further technical proposal is that: the device also comprises a remote control device positioned on the ground, wherein data transmission is carried out between the remote control device and a data transmission device positioned in the pulse generator through a wireless network, and the data transmission device is used for receiving a control command downloaded by the remote control device and uploading data processed by the pulse generator to the remote control device.
Preferably: the width of the positive electrode and the negative electrode is 1cm, and the electrode planes of the positive electrode and the negative electrode and the cup inside and the cup bottom of the sedimentation cup belong to the same plane.
The further technical proposal is that: the pulse generator is sleeved on the periphery of the external central tube, and the upper end of the external central tube is provided with connecting threads.
The further technical proposal is that: the upper edge of each sedimentation cup is connected with the upper edge of one sedimentation cup adjacent to the lower side of the sedimentation cup through an iron wire, the upper edge of each sedimentation cup is connected with the upper edge of the sedimentation cup through the iron wire, the lower edge of each sedimentation cup is connected with the lower edge of one sedimentation cup adjacent to the lower side of the sedimentation cup through the iron wire, the lower edges of the sedimentation cups are connected through the iron wire, a pair of positive and negative electrodes are formed by gaps between every two sedimentation cups, positive electrodes are connected together through the iron wire, and negative electrodes are connected together through the iron wire.
The further technical proposal is that: the oil-water separator is characterized in that a central tube is connected to the oil-water separator, four wires are arranged between the pulse generator at the periphery of the central tube and the central tube, two wires extend upwards to be connected with the turbine generator, electric energy generated by the turbine generator is transmitted to the pulse generator through the wires, and the other two wires are respectively connected with the positive electrode and the negative electrode at the edge of the sedimentation cup.
The further technical proposal is that: the upper ends of the two wires extending downwards are respectively connected with the signal output end of the pulse generator, enter the central tube of the multi-cup equal flow type oil-water separator, extend out into the gap of the sedimentation cup along one liquid inlet hole in the first row on the central tube, and are connected to the positive electrode and the negative electrode at the edge of the sedimentation cup.
The further technical proposal is that: two wires extending upwards are arranged close to the inner surface of the central tube, and two wires extending downwards are arranged close to the inner surface and the outer surface of the central tube and the upper surface and the lower surface of the sedimentation cup; the entire pulse generator is tightly fixed to the outer wall of the connected central tube.
The invention also discloses an oil-water separation method, which is characterized by comprising the following steps:
the turbine generator is powered by the pulse generator when in operation, the signal output end of the pulse generator provides pulse voltage signals for the positive electrode and the negative electrode at the edge of the sedimentation cup, each electric field is formed when the positive electrode and the negative electrode release pulse voltage, when stratum fluid enters the sedimentation cup, oil drop molecules are arranged into chains under the action of the electric fields, when the length of the chains reaches a certain length, coalescence occurs, small oil drops are fused into large oil drops, the larger the oil drop volume is, the faster the floating speed is, most oil drops are coalesced together, the quantity of the oil drops entering the central tube together with water is reduced, the liquid in the central tube is reinjected into the stratum after being lifted to a certain distance, and the oil-water ratio after the separated liquid is lifted to the ground is lifted.
The further technical proposal is that: when the flowing liquid speed in the sedimentation cup is increased, the liquid speed is fed back to the remote control device through the data transmission device, and the remote control device adjusts the control signal and properly improves the output pulse voltage frequency for the pulse signal generator.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the device combines the multi-cup equal-flow type oil-water separator with the pulse electric field to form a novel high-efficiency oil-water separator, the oil-water separator can well improve the oil-water separation efficiency, for example, the original multi-cup type oil-water separator is sensitive to the change of speed, and cannot have a good function when the speed is fast. The device of the invention selectively focuses on improving the efficiency of the gravity sedimentation type oil-water separator and improving the oil-water separation ratio. So that it can maintain separation efficiency even under the condition that the stratum condition is not so superior. Under the condition of keeping the original separation capacity of the separator, the oil-water separation speed is increased, the demulsification degree and the oil aggregation are accelerated, and the oil field requirements are met.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic view of an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a bottom edge electrode series of a sedimentation cup in an embodiment of the present invention;
FIG. 3 is a schematic diagram of the series connection of upper edge electrodes of a sedimentation cup in an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the connection of the bottom edge electrode of the sedimentation cup with the pulse generator in the embodiment of the present invention;
FIG. 5 is a schematic diagram showing the connection of the upper edge electrode of the sedimentation cup with the pulse generator in the embodiment of the invention;
wherein: 1. a central tube; 2. a turbine generator; 3. a pulse generator; 4. multiple cups of equal flow type oil-water separator; 5. a sedimentation cup; 6. an electrode at the lower edge of the sedimentation cup; 7. an electrode at the upper edge of the sedimentation cup; 8. a liquid inlet hole; 9. a remote control device; 10. an iron wire; 11. an electric wire.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, the embodiment of the invention discloses an underground oil-water separation device, which comprises a central tube 1, wherein a turbine generator 2 is arranged in an opening at the upper end of the external central tube 1, and the turbine generator 2 is fixed on the inner wall of the external central tube through a connecting rod; the upper end of the external central tube is provided with threads, so that the separation device is connected with other pipelines; a pulse generator 3 is fixed on the central tube 1 at the lower side of the generator, the power output end of the turbine generator 2 is connected with the power input end of the pulse generator 3, and the turbine generator 2 is used for providing a working power supply for the pulse generator 3; the turbine generator is internally provided with a fan, a storage battery and other structures, when the device is operated, the upward flowing liquid flow drives the fan of the engine to rotate, and the generated electric energy is stored in the storage battery to become a power supply of the pulse generator.
The central tube at the lower side of the pulse generator 3 is provided with a multi-cup equal-flow type oil-water separator 4, the multi-cup equal-flow type oil-water separator 4 comprises a plurality of sedimentation cups 5, the upper edge and the lower edge of each sedimentation cup 5 are respectively provided with a positive electrode and a negative electrode which directly encircle the edges of the sedimentation cups, all positive electrodes in the sedimentation cups 5 are connected together through wires, all negative electrodes in the sedimentation cups 5 are connected together through wires, and positive and negative output ends of the pulse generator 3 are respectively connected with the positive electrodes and the negative electrodes.
In addition, as shown in fig. 1, the device further comprises a remote control device 9 located on the ground, wherein data transmission is carried out between the remote control device 9 and a data transmission device located in the pulse generator 3 through a wireless network, and the data transmission device is used for receiving a control command downloaded by the remote control device 9 and uploading data processed by the pulse generator 3 to the remote control device. The remote control 9 is installed near the wellhead of the ground to adjust the frequency of the pulse power supply by people, observe the condition of the well and so on.
The data transmission device is equivalent to a switch, controls the operation of the pulse generator, feeds back the operation information of the pulse generator to the remote control device, and performs analysis on underground conditions by using the feedback information by people on the ground.
Further, the width of the positive electrode and the negative electrode is 1cm, and the electrode planes of the positive electrode and the negative electrode and the inside and the bottom of the sedimentation cup are in the same plane. As shown in fig. 2, the upper edge of each sedimentation cup 5 is connected to the upper edge of one sedimentation cup 5 adjacent to the lower side thereof by a wire 10, and the upper edges of the sedimentation cups 5 are all connected by the wire 10; as shown in fig. 3, the lower edge of each sedimentation cup 5 is connected to the lower edge of one sedimentation cup 5 adjacent to the lower side thereof by an iron wire 10, the lower edges of the sedimentation cups 5 are connected by the iron wire 10, a pair of positive and negative electrodes are formed by the gap between each two sedimentation cups, positive electrodes are connected together by the iron wire 10, and negative electrodes are connected together by the iron wire 10. The size of the gap between each sedimentation cup is not different from that of a common multi-cup equal-flow type oil-water separator.
Further, as shown in fig. 1, four wires 11 are disposed between the pulse generator 3 at the periphery of the central tube 1 and the central tube 1, two wires 11 extend upward to connect with the turbine generator 2, the electric energy generated by the turbine generator 2 is transmitted to the pulse generator 3 through the wires 11, and the other two wires 11 are respectively connected with the positive electrode and the negative electrode at the edge of the sedimentation cup. As shown in fig. 4 and 5, the upper ends of two wires 11 extending downward are respectively connected with the signal output end of the pulse generator 3, enter the central tube of the multi-cup equal flow type oil-water separator 4, extend out into the gap of the sedimentation cup along one liquid inlet hole 8 in the first row on the central tube 1, and are connected to the positive electrode and the negative electrode at the edge of the sedimentation cup. In order to avoid great influence on flowing liquid flow during operation, two wires 11 extending upwards are arranged close to the inner surface of the central tube, and two wires 11 extending downwards are arranged close to the inner surface and the outer surface of the central tube and the upper surface and the lower surface of the sedimentation cup 5; the entire pulse generator 3 is tightly fixed to the outer wall of the connected central tube.
In addition, the embodiment also discloses an oil-water separation method using the underground oil-water separation device, which comprises the following steps:
the turbine generator 2 supplies power to the pulse generator 3 when working, the signal output end of the pulse generator 3 provides pulse voltage signals for the positive electrode and the negative electrode at the edge of the sedimentation cup, each electric field is formed when the positive electrode and the negative electrode release pulse voltage, when stratum fluid enters the sedimentation cup 5, oil drop molecules are arranged into chains under the action of the electric fields, when the length of the chains reaches a certain length, coalescence occurs, the oil drops are fused into large oil drops, the larger the oil drop volume is, the faster the floating speed is, in addition, most oil drops are coalesced together due to the existence of the electric field, the quantity of the oil drops entering the central tube together with water is greatly reduced, the liquid in the central tube is reinjected into the stratum after being lifted to a certain distance, and the oil-water ratio after the separated liquid is lifted to the ground is obviously improved.
Multiple cups of the isopipe type oil-water separator are sensitive to environmental conditions such as oil-water density differences, liquid flow rates, etc. When the environment of the sedimentation cup 5 changes, for example, when the flowing liquid speed of the sedimentation cup becomes high, after the information is fed back to the ground through the data transmission device, the ground can properly raise the pulse voltage frequency for the pulse generator 3 so as to ensure the oil-water separation efficiency required by people. Similarly, when other conditions change, people can also adjust the remote control system to ensure that the whole oil-water separation system works normally.
The device of the invention selectively focuses on improving the efficiency of the gravity sedimentation type oil-water separator and improving the oil-water separation ratio. So that it can maintain separation efficiency even under the condition that the stratum condition is not so superior. Under the condition of keeping the original separation capacity of the separator, the oil-water separation speed is increased, the demulsification degree and the oil aggregation are accelerated, and the oil field requirements are met.
Claims (9)
1. An underground oil-water separation device is characterized in that: the device comprises an external central tube (1), wherein a turbine generator (2) is arranged in an opening at the upper end of the external central tube (1), a pulse generator (3) is fixed on the central tube (1) at the lower side of the generator, the power output end of the turbine generator (2) is connected with the power input end of the pulse generator (3), the turbine generator (2) is used for providing a working power supply for the pulse generator (3), a multi-cup equal-flow type oil-water separator (4) is formed on the central tube at the lower side of the pulse generator (3), the multi-cup equal-flow type oil-water separator (4) comprises a plurality of sedimentation cups (5), the upper edge of each sedimentation cup (5) is provided with a positive electrode directly surrounding the edge of the sedimentation cup, the lower edge of each sedimentation cup (5) is provided with a negative electrode directly surrounding the edge of the sedimentation cup, all the positive electrodes in the sedimentation cups (5) are connected together through wires, all the negative electrodes in the sedimentation cups (5) are connected together through wires, and the positive and negative output ends and the negative electrodes of the pulse generator (3) are respectively connected with the positive electrodes and the negative electrodes.
The upper edge of each sedimentation cup (5) is connected with the upper edge of one sedimentation cup (5) adjacent to the lower side of the sedimentation cup through an iron wire (10), the upper edges of the sedimentation cups (5) are connected through the iron wire (10), the lower edge of each sedimentation cup (5) is connected with the lower edge of one sedimentation cup (5) adjacent to the lower side of the sedimentation cup through the iron wire (10), the lower edges of the sedimentation cups (5) are connected through the iron wire (10), a pair of positive and negative electrodes are formed in a gap between every two sedimentation cups, the positive electrodes are connected together through the iron wire (10), and the negative electrodes are connected together through the iron wire (10).
2. The downhole oil-water separator of claim 1, wherein: the device also comprises a remote control device (9) positioned on the ground, wherein data transmission is carried out between the remote control device (9) and a data transmission device positioned in the pulse generator (3) through a wireless network, and the data transmission device is used for receiving a control command downloaded by the remote control device (9) and uploading data processed by the pulse generator (3) to the remote control device.
3. The downhole oil-water separator of claim 1, wherein: the width of the positive electrode and the negative electrode is 1cm, and the electrode planes of the positive electrode and the negative electrode and the cup inside and the cup bottom of the sedimentation cup belong to the same plane.
4. The downhole oil-water separator of claim 1, wherein: the pulse generator (3) is sleeved on the periphery of the external central tube (1), and connecting threads are arranged at the upper end of the external central tube (1).
5. The downhole oil-water separator of claim 1, wherein: four wires (11) are arranged between the pulse generator (3) at the periphery of the central tube (1) and the central tube (1), wherein two wires (11) extend upwards to be connected with the turbine generator (2), electric energy generated by the turbine generator (2) is transmitted to the pulse generator (3) through the wires (11), and the other two wires (11) are respectively connected with the positive electrode and the negative electrode at the edge of the sedimentation cup.
6. The downhole oil-water separator of claim 5, wherein: the upper ends of two wires (11) extending downwards are respectively connected with the signal output end of the pulse generator (3), enter the central tube of the multi-cup equal-flow type oil-water separator (4), extend out into the gap of the sedimentation cup along one liquid inlet hole (8) in the first row on the central tube (1), and are connected to the positive electrode and the negative electrode at the edge of the sedimentation cup.
7. The downhole oil-water separator of claim 6, wherein: two wires (11) extending upwards are arranged close to the inner surface of the central tube, and two wires (11) extending downwards are arranged close to the inner surface and the outer surface of the central tube and the upper surface and the lower surface of the sedimentation cup (5); the entire pulse generator (3) is tightly fixed to the outer wall of the connected central tube.
8. The oil-water separation method of the downhole oil-water separation device according to any one of claims 1 to 7, characterized by comprising the steps of:
the turbine generator (2) is used for supplying power to the pulse generator (3) when working, the signal output end of the pulse generator (3) provides pulse voltage signals for the positive electrode and the negative electrode at the edge of the sedimentation cup, a plurality of electric fields are formed when the positive electrode and the negative electrode release pulse voltage, when stratum fluid enters the sedimentation cup (5), oil drop molecules are arranged into chains under the action of the electric fields, coalescence occurs when the length of the chains reaches a certain length, small oil drops are fused into large oil drops, the larger the oil drop volume is, the floating speed is higher, most oil drops are coalesced together due to the existence of the electric fields, the quantity of the oil drops entering the central tube together with water is reduced, the liquid in the central tube is reinjected into the stratum after being lifted to a certain distance, and the oil-water ratio after the separated liquid is lifted to the ground is lifted.
9. The oil-water separation method as claimed in claim 8, wherein: when the flowing liquid speed in the sedimentation cup (5) is increased, the flowing liquid speed is fed back to the remote control device (9) through the data transmission device, and the remote control device (9) adjusts the control signal and properly increases the output pulse voltage frequency for the pulse generator (3).
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4257895A (en) * | 1979-05-08 | 1981-03-24 | Murdock Forrest L | Low gravity crude oil and water separator |
| CN101173182B (en) * | 2007-06-02 | 2013-07-10 | 中国石油大学(华东) | Novel crude oil emulsion electrostatic dehydrator |
| CN101773742B (en) * | 2010-02-21 | 2011-09-28 | 大庆油田有限责任公司 | Multilayer uniform-flow-type coalescence oil-water separator and separation method |
| CN105863622B (en) * | 2016-04-07 | 2019-05-28 | 中国海洋石油集团有限公司 | Shear valve mud pulse generator work system and its operating mode |
| CN108854163A (en) * | 2018-07-10 | 2018-11-23 | 中国石油天然气股份有限公司 | Oleophylic filler gravity separation oil-water separation device and separation method |
| CN108894759B (en) * | 2018-07-27 | 2023-09-26 | 中国石油天然气股份有限公司 | Underground oil-water separation injection and production integrated device based on electric pulse and application method thereof |
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