CN101074601A - Method for decreasing rock microporous flow resistance - Google Patents
Method for decreasing rock microporous flow resistance Download PDFInfo
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- CN101074601A CN101074601A CN 200710042733 CN200710042733A CN101074601A CN 101074601 A CN101074601 A CN 101074601A CN 200710042733 CN200710042733 CN 200710042733 CN 200710042733 A CN200710042733 A CN 200710042733A CN 101074601 A CN101074601 A CN 101074601A
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Abstract
The invention relates to a method to decrease the rock micro space flowing resistance. It pours the solution containing the drainage nanometer particle into the rock micro space in petroleum reserving layer to keep the effect absorbing time. So the drainage nanometer particle absorbs the rock micro space wall which is formed with a nanometer absorbing layer to make the wetting property of the rock micro hole wall become the hydrophobicity to form the flow slipping layer and the water-flow resistance is decreased.
Description
Technical field
The present invention relates to a kind of method that reduces rock microporous resistance to water-flow in the petroleum reservoir, particularly a kind of method of utilizing nano particle absorption realizes reducing the method for rock microporous resistance to water-flow in the petroleum reservoir, its to petroleum works step-down augmented injection, improve recovery ratio and have crucial meaning.
Background technology
The method that reduces current (seepage flow) resistance in rock microporous in the petroleum works mainly contains two kinds: the one, handle by offensiveness the stratum, and enlarge the duct of formation rock, improve the earial drainage area, as measures such as acidifying, acid fracturing and fracturings; The 2nd, reduce fluid and rock microporous frictional resistance, improve flow velocity.
In fact, through long-term injecting water, the rock microporous surface of the nearly well band of water injection well is through washing away for a long time, and wettability of the surface initial lipophile in duct changes hydrophily into, forms a hydrated sheath.This hydrated sheath diminishes rock microporous effective diameter, and resistance to water-flow is increased substantially, and the concrete water injection pressure that shows as rises significantly, and water injection rate descends.As everyone knows, can change rock microporous wettability of the surface, reduce the interfacial tension of fluid and rock simultaneously, thereby improve oil recovery factor or improve water injection rate by injecting surfactant.Smooth surface is owing to the difference of wetability, and the flow performance of convection cell can produce different influences.
Summary of the invention
The objective of the invention is to problem, a kind of physical method that reduces the rock microporous resistance to water-flow of petroleum reservoir is provided at the prior art existence.
In order to achieve the above object, the present invention adopts following technical proposals:
A kind of method that reduces rock microporous resistance to water-flow, it is rock microporous that the solution that it is characterized in that containing hydrophobic nanoparticles injects petroleum reservoir, and the adsorption time of remaining valid, nano particle and hole wall are adsorbed, on rock microporous hole wall, produce adsorption layer, and make the wetability of rock microporous hole wall become hydrophobicity by original hydrophily, thus form the current glide lamella, realize reducing the resistance to water-flow purpose.
Contain nano-solution and comprise following two kinds:
1) the nanometer SiO of 1～10 ‰ weight ratio
2Be dispersed in to uniform particles the solution that constitutes in diesel oil or the kerosene, nanometer SiO
2Particle grain size is 5～80nm.
2) contain nanometer SiO
2Behind the organic solvent emulsifying of particle, after stirring, evenly spread to the solution that constitutes in the water, nanometer SiO
2The content of particle is controlled in 1～10 ‰ weight ratio scope, and grain diameter is 5～80nm.
Above-mentioned adsorption layer is monolayer adsorption or double-deck absorption, and adsorption layer is 40%～100% to the coverage scale of rock core hole wall.
The rock microporous aperture of above-mentioned petroleum reservoir is 0.1～100 μ m.
Above-mentioned effective adsorption time is 10 hours or greater than 10 hours.
The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: rock microporous injection contains hydrophobic nanoparticles solution to the present invention's employing to petroleum reservoir, make rock microporous hole wall become hydrophobicity by original hydrophily, even become strong-hydrophobicity or super-hydrophobicity, with this physical method, reduced rock microporous resistance to water-flow.The experiment proved that the present invention can make rock (being rock core in the laboratory) water phase permeability improve 30～60%, average out to 47% effectively reduces resistance to water-flow.
Description of drawings
Fig. 1 is the microstructure figure of nanotube sample under 100,000 times of transmission electron microscopes.
Fig. 2 is the 20000 times of sem photographs in blank rock sample surface.
Fig. 3 is nano particle 20,000 times of sem photographs of absorption on the rock sample surface.
Fig. 4 is that water droplet is at blank sliver surface contact angle sectional drawing.
Fig. 5 is that water droplet is at the rock sample face contact angle sectional drawing that soaks nanometer liquid.
The specific embodiment
Details are as follows in conjunction with the accompanying drawings for a preferred embodiment of the present invention:
This method that reduces rock microporous resistance to water-flow is to contain dewatering nano SiO
2(footpath is 5～80nm) solution injection petroleum reservoir rock microporous (aperture is 0.1～100 μ m) to particle, keep the effective adsorption time more than 10 hours, nano particle and hole wall are adsorbed, on rock microporous hole wall, produce adsorption layer, and make the wetability of rock microporous hole wall become strong-hydrophobicity or super-hydrophobicity by original hydrophily, thereby form the current glide lamella, realize reducing the resistance to water-flow purpose.
Containing nano-solution is: the nanometer SiO of 1～10 ‰ weight ratio
2Uniform particles is dispersed in the solution that constitutes in diesel oil or the kerosene.Perhaps for containing nanometer SiO
2The organic solvent emulsifying of particle is dispersed in the solution that constitutes in the water after stir.
Adsorption layer is monolayer adsorption layer or double-deck adsorption layer, is 40～100% to rock core hole wall coverage scale.
Principle is as follows:
The dewatering nano SiO that present embodiment adopts
2Show as a kind of nontoxic, tasteless, free of contamination white powder.There is the hydroxyl of unsaturated outstanding key and different bonding states in nanometer injection agent surface, and surface hydroxyl accounts for more than 40%.Fig. 1 is the microstructure picture of nanotube sample under 100,000 times of transmission electron microscopes.The main size distribution of nanotube sample is in 5～80nm scope.
Effective channel diameter of hyposmosis petroleum reservoir rock generally has nanometer one micron-sized magnitude.There are the laminated clay mineral on the rock sample surface that this example adopts, and corner angle are clearly demarcated, see Fig. 2.Because the existence of hydrated sheath, flow resistance is bigger.Nano particle forms nanometer layer after rock microporous hole wall adsorbs, see Fig. 3, can't see the rock sample body, the corner angle slyness, and the surface is occupied by one deck nano particle, and particle is the ellipsoid shape, interconnects, and adsorbs tightr.Integral body is stereo structure, is rock prototype structure feature.
After the nano particle absorption, variation has taken place in the rock sample wettability of the surface, changes strong-hydrophobicity into by original hydrophily.Among Fig. 4, the contact angle of water droplet on blank rock sample surface is respectively 49.1 °, 38.1 ° and 24.1 ° and illustrates that rock samples are that water is wet.Among Fig. 5, the contact angle of water droplet on the rock sample surface of having adsorbed nano particle is respectively 105 °, 101.2 ° and 99.8 °, shows as obvious hydrophobic.
The flow resistance of nanometer absorption back rock core descends significantly, and it can be described with the raising of the water phase permeability of rock core.The result that table 1 flowing experiment that to be four blocks of rock cores done before and after nanometer absorption records.As can be seen from the table, rock sample is handled back water phase permeability raising 30%～60%, average out to 47% at nano-fluid.
The variation of rock core water phase permeability before and after the absorption of table 1 nanometer
Claims (6)
1. reduce the method for rock microporous resistance to water-flow once, it is rock microporous that the solution that it is characterized in that containing hydrophobic nanoparticles injects petroleum reservoir, the adsorption time of remaining valid, hydrophobic nanoparticles and hole wall are adsorbed, on rock microporous hole wall, produce adsorption layer, and make the wetability of rock microporous hole wall become hydrophobicity by original hydrophily, thus form the current glide lamella, realize reducing the resistance to water-flow purpose.
2. the method for the rock microporous resistance to water-flow of reduction according to claim 1 is characterized in that the described nanometer SiO that hydrophobic nanoparticles solution is 1～10 ‰ weight that contains
2Be dispersed in to uniform particles the solution that constitutes in diesel oil or the kerosene, nanometer SiO
2Particle grain size is 5～80nm.
3. the method for the rock microporous resistance to water-flow of reduction according to claim 1 is characterized in that the described hydrophobic nanoparticles solution that contains is nanometer SiO
2Particle is dispersed in emulsification in the organic solvent, evenly spreads to the solution that constitutes in the water, nanometer SiO after stirring
2The weight ratio of particle is 1～10 ‰, nanometer SiO
2Particle grain size is 5～80nm.
4. the method for the rock microporous resistance to water-flow of reduction according to claim 1 is characterized in that the rock microporous aperture of described petroleum reservoir is 0.1～100 μ m.
5. the method for the rock microporous resistance to water-flow of reduction according to claim 1 is characterized in that described effective adsorption time is 10 hours or greater than 10 hours.
6. the method for the rock microporous resistance to water-flow of reduction according to claim 1 is characterized in that described adsorption layer is monolayer adsorption layer or double-deck adsorption layer; Adsorption layer is 40～100% to the coverage scale of rock microporous hole wall.
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| CN2007100427331A CN101074601B (en) | 2007-06-26 | 2007-06-26 | Method for decreasing rock microporous flow resistance |
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| CN2007100427331A CN101074601B (en) | 2007-06-26 | 2007-06-26 | Method for decreasing rock microporous flow resistance |
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| CN101074601B CN101074601B (en) | 2010-11-17 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101735787A (en) * | 2009-12-22 | 2010-06-16 | 上海大学 | Nano material-based water-based oil field injection agent and preparation method thereof |
| CN102144075A (en) * | 2008-06-18 | 2011-08-03 | 德克萨斯州立大学董事会 | Maintaining shale stability by pore plugging |
| CN102268980A (en) * | 2011-06-22 | 2011-12-07 | 上海大学 | Method for reducing resistance to water flow of rock microporous channel by using double action mechanism |
| CN105612306A (en) * | 2013-11-25 | 2016-05-25 | 哈利伯顿能源服务公司 | Superhydrophobic flow control device |
| CN104594859B (en) * | 2015-01-12 | 2018-04-27 | 中国石油大学(华东) | A kind of method of the fine and close oily oil reservoir of nano-fluid exploitation |
| CN112857935A (en) * | 2021-01-22 | 2021-05-28 | 上海大学 | Preparation method of large-grade-difference heterogeneous nonmagnetic core |
| CN114054463A (en) * | 2021-11-29 | 2022-02-18 | 清华大学 | Porous medium blind end hole and self-cleaning or self-collecting method thereof |
| CN114562239A (en) * | 2022-03-07 | 2022-05-31 | 吉林大学 | Method and device for improving hydrate reservoir exploitation efficiency by adopting nanofluid |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3920074A (en) * | 1974-04-19 | 1975-11-18 | Union Oil Co | Method for improving the injectivity of water injection wells |
| DE19742761A1 (en) * | 1997-09-27 | 1999-04-01 | Gerd Dr Rossmy | Amphiphilic particles or molecules which are predominantly hydrophilic and predominantly hydrophobic domains are anisotropically distributed on their surface |
| CN1210489C (en) * | 2002-04-13 | 2005-07-13 | 大庆油田有限责任公司 | Method for reducing starting pressure of low permeability oil field |
| CN1210490C (en) * | 2002-04-13 | 2005-07-13 | 大庆油田有限责任公司 | Method for increasing relative permeability of polymer injection well |
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2007
- 2007-06-26 CN CN2007100427331A patent/CN101074601B/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102144075A (en) * | 2008-06-18 | 2011-08-03 | 德克萨斯州立大学董事会 | Maintaining shale stability by pore plugging |
| CN102144075B (en) * | 2008-06-18 | 2015-01-07 | 德克萨斯州立大学董事会 | Maintaining shale stability by pore plugging |
| CN101735787A (en) * | 2009-12-22 | 2010-06-16 | 上海大学 | Nano material-based water-based oil field injection agent and preparation method thereof |
| CN102268980A (en) * | 2011-06-22 | 2011-12-07 | 上海大学 | Method for reducing resistance to water flow of rock microporous channel by using double action mechanism |
| CN105612306A (en) * | 2013-11-25 | 2016-05-25 | 哈利伯顿能源服务公司 | Superhydrophobic flow control device |
| US10113104B2 (en) | 2013-11-25 | 2018-10-30 | Halliburton Energy Services, Inc. | Superhydrophic flow control device |
| CN105612306B (en) * | 2013-11-25 | 2019-04-05 | 哈利伯顿能源服务公司 | Super-hydrophobicity flow control apparatus |
| CN104594859B (en) * | 2015-01-12 | 2018-04-27 | 中国石油大学(华东) | A kind of method of the fine and close oily oil reservoir of nano-fluid exploitation |
| CN112857935A (en) * | 2021-01-22 | 2021-05-28 | 上海大学 | Preparation method of large-grade-difference heterogeneous nonmagnetic core |
| CN112857935B (en) * | 2021-01-22 | 2022-11-18 | 上海大学 | Preparation method of large-grade-difference heterogeneous nonmagnetic core |
| CN114054463A (en) * | 2021-11-29 | 2022-02-18 | 清华大学 | Porous medium blind end hole and self-cleaning or self-collecting method thereof |
| CN114562239A (en) * | 2022-03-07 | 2022-05-31 | 吉林大学 | Method and device for improving hydrate reservoir exploitation efficiency by adopting nanofluid |
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| CN101074601B (en) | 2010-11-17 |
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