CN109464827B - Oil-water separation device and oil-water separation device pipe string - Google Patents
Oil-water separation device and oil-water separation device pipe string Download PDFInfo
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- CN109464827B CN109464827B CN201710801445.3A CN201710801445A CN109464827B CN 109464827 B CN109464827 B CN 109464827B CN 201710801445 A CN201710801445 A CN 201710801445A CN 109464827 B CN109464827 B CN 109464827B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
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Abstract
The invention provides an oil-water separation device and an oil-water separation device pipe string, wherein the oil-water separation device comprises: the supporting cylinder is provided with a plurality of first overflowing holes; the oil-water separation membrane is arranged on the outer side of the supporting cylinder; the oil-water separation membrane comprises a framework structure formed by carbon nano materials and a high polymer material which is filled or coated on the framework structure and has oleophylic and hydrophobic properties. This oil-water separator tube string includes: an oil pipe; the oil-water separation devices provided by the embodiment of the invention are arranged on the oil pipe; a plurality of packers disposed on the tubing. The invention can realize intelligent separation of oil-water mixture without depending on pressure difference, thereby improving the recovery ratio and solving the problems of difficult structure adjustment and difficult later yield increase after the conventional flow-regulating water-control sieve tube nozzle type and channel type water-control valves enter the well.
Description
Technical Field
The invention relates to the technical field of oil and gas field well completion engineering, in particular to an oil-water separation device and an oil-water separation device pipe string.
Background
In recent years, horizontal well technology is gradually applied in large quantities, but the problems of fast horizontal well yield decrease, fast bottom water rise, difficult water exploration and water shutoff and the like also become technical keys influencing the long-term stable yield of the horizontal well. How to furthest guarantee that each part of the horizontal section can produce in a balanced manner and realizing water control becomes a key technical problem in horizontal well development. Aiming at the problem, various horizontal well water control completion technologies appear at home and abroad, such as segmented variable density sieve tube water control completion, central tube water control completion, ICD water control sieve tube completion, flow regulation water control sieve tube completion and the like.
The flow-regulating and water-controlling screen pipe well completion technology can effectively prolong the waterless oil production period of the horizontal well and achieve the purpose of improving the development effect, so that the flow-regulating and water-controlling screen pipe well completion technology is widely applied. The flow-regulating water-controlling sieve tube well completion technology can shorten the well completion period, reduce reservoir pollution and facilitate reservoir protection; the well completion cost is reduced, and the later water plugging operation cost is avoided; the flow-regulating and water-controlling well completion reduces the water content, improves the displacement effect of bottom water, balances the profile of produced liquid and finally improves the recovery ratio.
However, the flow-regulating and water-controlling sieve tube has the following problems in the application process: the size of a water nozzle needs to be set before the flow-regulating and water-controlling sieve tube is put in, the water nozzle cannot be regulated after the flow-regulating and water-controlling sieve tube is put in, and the difficulty of later-stage extracting is high; the stratum collapse is caused by the long-time production of the oil well, so that the blockage outside the flow regulating and water controlling sieve tube is increased, and the water regulating and controlling capacity of the flow regulating and water controlling sieve tube is reduced; the additional pressure difference is too small under the condition of low liquid yield, and the water control effect is influenced. The increase of the external resistance of the sieve tube after the stratum collapses increases the flow resistance of oil and water at the same time, reduces the multiple of the flow resistance of the oil and water flowing from the stratum to the inside of the sieve tube through the nozzles, and weakens the control action of the water nozzle on the water.
Therefore, the problems that the difficulty of later-stage extract of the water control sieve tube is high, the additional pressure difference is small under the condition of low liquid yield to influence the water control effect, the flowing resistance multiple of oil and water from the stratum to the inside of the sieve tube through the nozzle of the water control sieve tube is reduced when the flowing resistance of the oil and water is increased, the weakening of the nozzle for water control is caused, and the like are still to be solved urgently in the development of the horizontal well.
Disclosure of Invention
Features and advantages of the invention will be set forth in part in the description which follows, or may be obvious from the description, or may be learned by practice of the invention.
In order to overcome the problems of the prior art, the invention provides an oil-water separation device, which is characterized by comprising:
the supporting cylinder is provided with a plurality of first overflowing holes;
the oil-water separation membrane is arranged on the outer side of the supporting cylinder; the oil-water separation membrane comprises a framework structure formed by carbon nano materials and a high polymer material which is filled or coated on the framework structure and has oleophylic and hydrophobic properties.
Optionally, the carbon nanomaterial comprises at least one of carbon nanotubes, carbon fibers and graphene; the high polymer material comprises at least one of polyvinylidene fluoride, polypropylene, polystyrene and polyether sulfone.
Optionally, the thickness of the end of the support cylinder is greater than the thickness of the middle region of the support cylinder.
Optionally, the oil-water separation device further comprises an inner protection layer located between the support cylinder and the oil-water separation membrane.
Optionally, the oil-water separation device further comprises a sand filtering layer which is positioned outside the oil-water separation membrane.
Optionally, the sand filter further comprises an outer protective layer positioned between the oil-water separation membrane and the sand filter layer.
Optionally, the base pipe is positioned inside the support cylinder and is connected with the support cylinder through threads; and a second overflowing hole is formed in the base pipe.
Optionally, the second overflow aperture is offset from the first overflow aperture by a predetermined angle.
According to another aspect of the present invention, there is provided an oil-water separator tube string including:
an oil pipe;
the oil-water separation device provided by any embodiment of the invention is arranged on the oil pipe;
a plurality of packers disposed on the tubing.
Optionally, 2 to 5 oil-water separation devices are arranged between two adjacent packers.
The invention provides an oil-water separation device and an oil-water separation device pipe string, wherein an oil-water separation membrane is applied to realize separation of an underground oil-water mixture, and the oil-water separation membrane has oleophylic and hydrophobic characteristics, so that only oil enters a base pipe through the separation device to separate water in an annulus; the problems that the difficulty of later-stage liquid extraction of the water control sieve tube is high, the additional pressure difference is small under the condition of low liquid yield to influence the water control effect and the like are solved, and the problem that the flowing resistance multiple of oil and water from the stratum to the inside of the sieve tube through the nozzle of the water control sieve tube is reduced when the flowing resistance of the oil and water is increased, so that the nozzle is weakened for water control and the like is solved.
The features and content of these solutions will be better understood by those skilled in the art from reading the present description.
Drawings
The advantages and realisation of the invention will be more apparent from the following detailed description, given by way of example, with reference to the accompanying drawings, which are given for the purpose of illustration only, and which are not to be construed in any way as limiting the invention, and in which:
fig. 1 is a schematic structural view of an oil-water separation device according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional structure view of the oil-water separator shown in fig. 1.
Fig. 3 is a schematic flow diagram of a fluid in the oil-water separation device according to the embodiment of the invention.
Fig. 4 is a schematic structural diagram of a support cylinder according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of the oil-water separation device tube string according to the embodiment of the invention.
Detailed Description
As shown in fig. 1 to 3, the present invention provides an oil-water separator including a support cylinder 12 and an oil-water separation membrane 14 disposed outside the support cylinder 12. Wherein, a plurality of first overflowing holes 21 are arranged on the supporting cylinder 12; the oil-water separation membrane 14 includes a skeleton structure formed by carbon nanomaterials and a polymer material having oleophilic and hydrophobic properties, which is filled or coated on the skeleton structure.
The oil-water separation membrane 14 in this embodiment is formed of a skeleton network based on carbon nanotubes, carbon fibers, and graphene, and is filled and coated with a polymer material. The carbon nano material is used as a skeleton structure to enhance the strength of the high polymer material, and the carbon nano material comprises at least one of carbon nano tubes, carbon fibers and graphene. The oil-water separation membrane 14 utilizes the strength of the carbon nano material and the oleophylic and hydrophobic properties of the carbon nano tube and the carbon fiber, and simultaneously utilizes the high polymer material to construct a super-wetting oleophylic and hydrophobic separation membrane, so that the high-efficiency separation of the membrane method emulsion driven under extremely low pressure is realized, and the emulsion can be separated at high flux under self-driving without external pressure; the high polymer material comprises at least one of polyvinylidene fluoride, polypropylene, polystyrene and polyether sulfone.
The oil-water separation membrane 14 is preferably prepared by a wet phase conversion process to form the hydrophobic oleophylic porous membrane of the present invention, the surface of the membrane has a micro-nano structure, and the membrane has nano-scale and micron/submicron-scale pore channels, when the membrane is applied to separation of oil and water (including emulsified oil and water), the membrane can generate very good separation efficiency (the oil-water separation efficiency is generally over 90%), the static contact angle of the surface of the porous membrane to a water phase system is more than 140 degrees, and the static contact angle to the oil phase system is less than 10 degrees.
In this embodiment, the oil-water separation membrane 14 simulates a structure in which molecular chains in a polymer are interlaced and wound, and a carbon nanomaterial is used as a basic material, and a nano-thick high-strength mesh-structured ultrathin membrane with a network interpenetrating structure is prepared by a wet chemical method, wherein the membrane thickness is adjustable from tens of nanometers to hundreds of nanometers, and the membrane aperture is adjustable within a range of tens of nanometers.
In order to support and protect the oil-water separation membrane, protective layers may be provided on both sides of the oil-water separation membrane 14, and more specifically, an inner protective layer 13 may be provided between the support cylinder 12 and the oil-water separation membrane 14; an outer protective layer 15 may be further provided on the side of the oil-water separation membrane 14 remote from the support cylinder 12.
In another embodiment of the present invention, a sand filter 16 is further included and is located outside the oil-water separation membrane 14. The sand filtering layer 16 can play a role in preventing sand and filtering large-particle impurities, so that impurities in the oil-water mixture are blocked at the outer layer. The outer protective layer 15 is located between the oil-water separation membrane 14 and the sand filter layer 16.
Generally, the base pipe 11 is positioned inside the supporting cylinder 12 and is connected with the supporting cylinder through threads; a second overflowing hole 22 is formed in the base pipe 11. More specifically, the second overflowing hole 22 is offset from the first overflowing hole 21 provided on the support cylinder 12 by a predetermined angle. The preset angle can be determined according to the number of the first overflowing holes in the circumferential direction. In this embodiment, the number of the first overflowing holes 21 and the number of the second overflowing holes in the circumferential direction are both 4, and at this time, the preset angle may be 45 °. As shown in fig. 3, after the fluid passes through the filtering sand layer 16, the outer protective layer 15, the oil-water separation membrane 14 and the inner protective layer 13, only oil and a small amount of water pass through the first through-flow hole 21 on the support cylinder and then pass through the second through-flow hole 22 on the base pipe to enter the base pipe 11, and due to the hydrophobic property of the oil-water separation membrane, water is organized outside the separation membrane.
As shown in fig. 4, in the present embodiment, the thickness of the end portion 31 of the support cylinder is greater than the thickness of the middle region 32 of the support cylinder; more specifically, the outer wall of the end portion 31 of the support cylinder has a height difference with the outer wall of the middle region 32, and the outer wall of the middle region 32 is lower than the outer wall of the end portion 31, the oil-water separation membrane 14 is disposed on the middle region 32 of the support cylinder; generally, the total height of the inner protective layer 13, the oil-water separation membrane 14, the outer protective layer 15, and the sand filter layer 16 may be equal to or close to the height difference between the outer wall of the end portion 31 and the outer wall of the intermediate region 32 of the support cylinder. Furthermore, the inner diameter of the tip of the end 31 of the support cylinder is smaller than the inner diameter of the middle area of the support cylinder; the end 31 of the support cylinder may be internally threaded for connection to the base pipe 11, with a gap between the middle region of the support cylinder and the base pipe 11 to form a fluid passage.
As shown in fig. 5, the present invention further provides an oil-water separator string, which includes an oil pipe 60, and a plurality of oil-water separators 10 and a plurality of packers 40 provided in any embodiment of the present invention and disposed on the oil pipe 60.
In the present embodiment, 2 to 5 oil-water separation devices 10, for example, 3 oil-water separation devices 10 are provided between two adjacent packers 40. Packer 40 may divide the horizontal well section into multiple sections to achieve a balanced effective production pressure differential profile and fluid production profile. The produced fluid of the stratum 70 firstly enters an annular space 50 between the oil-water separation device and the open hole shaft, axial flow and transverse cross flow exist in the annular space 50, the fluid enters an annular space between a sand filter layer and a base pipe through the sand filter layer of the oil-water separation device 10, the annular spaces of different oil-water separation devices are not communicated, and the fluid entering the annular space of the annular space 50 enters the base pipe through an oil-water separation membrane.
According to the oil-water separation device and the oil-water separation device pipe string provided by the embodiment of the invention, the oil-water separation device utilizes the oleophylic and hydrophobic characteristics of graphene, carbon nano tubes, specific high polymer materials and the like to form the oil-water separation membrane with a nano structure through lapping or spinning, so that the separation of an oil-water mixture is realized, only oil enters a base pipe through the oil-water separation membrane, and water is blocked outside the separation membrane. The oil-water separation device pipe string divides a horizontal well section into a plurality of sections by using a packer, so that a differential pressure section and a liquid production section are produced uniformly and effectively, and the sectional balanced oil extraction is realized; the invention can realize intelligent separation of oil-water mixture without depending on pressure difference, thereby improving the recovery ratio and solving the problems of difficult structure adjustment and difficult later yield increase after the conventional flow-regulating water-control sieve tube nozzle type and channel type water-control valves enter the well.
While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, those skilled in the art will appreciate that various modifications can be made to the present invention without departing from the scope and spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, which is defined in the appended claims.
Claims (8)
1. An oil-water separator, comprising:
the supporting cylinder is provided with a plurality of first overflowing holes;
the oil-water separation membrane is arranged on the outer side of the supporting cylinder; the oil-water separation membrane comprises a skeleton structure formed by carbon nano materials and a high polymer material which is filled or coated on the skeleton structure and has oleophylic and hydrophobic properties;
the base pipe is positioned on the inner side of the supporting cylinder and is connected with the supporting cylinder through threads;
a second overflowing hole is formed in the base pipe; the second overflowing hole is offset from the first overflowing hole by a preset angle.
2. The oil-water separator according to claim 1, wherein the carbon nanomaterial comprises at least one of carbon nanotubes, carbon fibers, and graphene; the high polymer material comprises at least one of polyvinylidene fluoride, polypropylene, polystyrene and polyether sulfone.
3. The oil and water separator as claimed in claim 1, wherein the end portion of the support cylinder has a thickness greater than a thickness of the middle region of the support cylinder.
4. The oil-water separator according to claim 1, further comprising an inner protective layer between the support cylinder and the oil-water separation membrane.
5. The oil-water separator according to claim 1, further comprising a sand filter layer located outside the oil-water separation membrane.
6. The oil-water separator according to claim 5, further comprising an outer protective layer between the oil-water separation membrane and the sand filter.
7. The utility model provides an oil-water separator tube cluster which characterized in that includes:
an oil pipe;
a plurality of oil-water separation devices according to any one of claims 1 to 6, disposed on the oil pipe;
a plurality of packers disposed on the tubing.
8. The string of oil and water separators of claim 7 wherein between two adjacent packers there are between 2 and 5 oil and water separators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710801445.3A CN109464827B (en) | 2017-09-07 | 2017-09-07 | Oil-water separation device and oil-water separation device pipe string |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710801445.3A CN109464827B (en) | 2017-09-07 | 2017-09-07 | Oil-water separation device and oil-water separation device pipe string |
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| Publication Number | Publication Date |
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| CN109464827A CN109464827A (en) | 2019-03-15 |
| CN109464827B true CN109464827B (en) | 2021-01-08 |
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| CN201710801445.3A Active CN109464827B (en) | 2017-09-07 | 2017-09-07 | Oil-water separation device and oil-water separation device pipe string |
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| CN111318179A (en) * | 2020-03-09 | 2020-06-23 | 西南石油大学 | MnO with superstrong oil stain resistance2/carbon fiber cloth composite filtering membrane and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203683257U (en) * | 2014-01-27 | 2014-07-02 | 北京福斯菲尔环境科技有限公司 | Oil-water separation device |
| CN105080356A (en) * | 2015-08-04 | 2015-11-25 | 天津工业大学 | Hydrophobic oleophylic hollow fiber composite film and preparation method thereof |
| CN106064843A (en) * | 2016-07-06 | 2016-11-02 | 湖州深净环境科技有限公司 | A kind of resistant oily-water seperating equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11370005B2 (en) * | 2014-03-17 | 2022-06-28 | Korea Institute Of Science And Technology | Nano composite structure with nano patterned structure on its surface and method of preparing the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203683257U (en) * | 2014-01-27 | 2014-07-02 | 北京福斯菲尔环境科技有限公司 | Oil-water separation device |
| CN105080356A (en) * | 2015-08-04 | 2015-11-25 | 天津工业大学 | Hydrophobic oleophylic hollow fiber composite film and preparation method thereof |
| CN106064843A (en) * | 2016-07-06 | 2016-11-02 | 湖州深净环境科技有限公司 | A kind of resistant oily-water seperating equipment |
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