CN102519995A - Method for rapidly evaluating effect of reducing resistance of water flow in petroleum reservoir stratum micro-channel by adopting nanoparticle adsorption method - Google Patents
Method for rapidly evaluating effect of reducing resistance of water flow in petroleum reservoir stratum micro-channel by adopting nanoparticle adsorption method Download PDFInfo
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- CN102519995A CN102519995A CN201110418804XA CN201110418804A CN102519995A CN 102519995 A CN102519995 A CN 102519995A CN 201110418804X A CN201110418804X A CN 201110418804XA CN 201110418804 A CN201110418804 A CN 201110418804A CN 102519995 A CN102519995 A CN 102519995A
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Abstract
The invention relates to a method for rapidly evaluating the effect of reducing the resistance of water flow in a petroleum reservoir stratum micro-channel by adopting the nanoparticle adsorption method and using a scanning electron microscope (SEM) and a contact angle measurement result. The method comprises the following steps: soaking a rock core piece from the specified stratum in a nanoparticle dispersion liquid for more than 24 hours so that nanoparticles are adsorbed on the surface of the rock core piece, taking out the rock core piece, washing, drying, testing the apparent contact angles of water drops on the rock core piece by using a contact angle tester, scanning by using the SEM, determining that whether the nanoparticles are adsorbed on the surface of the rock core piece or not, and judging rapidly according to the test result: confirming that the nano material has the effect of decreasing the pressure and increasing the injection of a rock core when the SEM detects that the nanoparticles are adsorbed and the apparent contact angles are larger than 120 degrees without carrying out the subsequent experimental evaluation of the flow of the rock core. Due to the adoption of the method, the indoor evaluating time can be shorted by about 40%, and the researching process of the nano material is accelerated.
Description
Technical field
The present invention relates to a kind ofly judge that the nano particle absorption method reduces in the petroleum reservoir whether resultful fast appraisement method of rock microchannel resistance to water-flow, its to petroleum engineering step-down augmented injection, improve recovery ratio and have crucial meaning.
Background technology
The method that reduces current (seepage flow) resistance in the rock microchannel in the petroleum engineering mainly contains two kinds: the one, through the stratum being carried out transformations such as acidifying, pressure break, enlarge the microchannel of formation rock, and improve the earial drainage area; The 2nd, reduce the frictional resistance between fluid and the rock microchannel hole wall.
Through long-term injecting water, the nearly well band of water injection well rock microchannel surface has changed water wettability into, and resistance to water-flow is increased substantially.Through injecting the interfacial tension that surfactant can change rock microchannel surface and current, reach the purpose that lowers resistance to water-flow.But because surfactant is not strong at the adhesive force of hole wall surface, therefore the term of validity of this method is shorter.
For this reason; Proposed to utilize the hydrophobic nanoparticles absorption method to reduce the new method of reservoir microchannel resistance to water-flow; And obtain good effect, but owing to the otherness between the block reservoir of different oil fields and the complicacy of petroleum reservoir, different oil fields block needs different nano materials; So when block is implemented nano particle absorption method step-down increase water injection technology in specific oil field, need development to be fit to the nano material of this oil field block.This process need long period is carried out repetition test and evaluation, and especially the shared time of appraisal is longer.Except that the nano material preparation process, evaluation procedure comprises:
1) activation grade evaluation: the quality of main test nano grain surface modification process, the i.e. whole hydrophobicity of nano material.The height direct relation of activation grade the wettability reversal effect, thereby influences step-down augmented injection effect.
2) adsorption effect evaluation: mainly utilize ESEM (SEM) check nano particle and to observe its configuration of surface in given reservoir core sheet surface absorption.This is the basis of nano particle absorption method step-down increase water injection technology.
3) wettability reversal effect assessment: after the absorption of main test nano particle, can the microchannel wall is converted into by strong hydrophilicity strong hydrophobic or super-hydrophobic.Thereby can be the nano particle absorption method produce the core mechanism that the slippage effect reaches drag-reduction effect for this.
4) drag-reduction effect evaluation: prepared condition though three processes in front are nano particle absorption method drag reduction, the best approach or the rock core flowing experiment of check drag-reduction effect.Rock core flowing experiment can adopt actual rock core, local water, and environment such as formation temperature, pressure are provided, and can simulate reservoir seepage flow characteristic well.But it is longer that the deficiency of rock core flowing experiment is an experimental period.
Summary of the invention
The objective of the invention is to problem to the prior art existence; The fast appraisement method that a kind of nano particle absorption method reduces petroleum reservoir microchannel resistance to water-flow effect is proposed; Reduce the shared time of evaluation procedure, shorten the construction cycle of the required nano material in specific stratum.
In order to achieve the above object, the present invention adopts following technical proposals:
A kind of nano particle absorption method reduces the fast appraisement method of petroleum reservoir microchannel resistance to water-flow effect, utilizes ESEM, contact angle test result to come to estimate fast drag-reduction effect.Concrete steps are following:
1) will specify the rock core sheet on stratum in nanoparticulate dispersion, to soak more than 24 hours, and make nano particle in rock core sheet surface adsorption, and subsequently the rock core sheet taken out, flushing is also dry;
2) utilize the contact angle tester to measure the apparent contact angle of water droplet on the rock core sheet, with ESEM the rock core sheet is scanned again;
3) judge fast according to test result that as long as scanning result shows nano particle in rock core sheet surface adsorption, and the contact angle test result just can judge that greater than 120 ° this nano material has drag-reduction effect preferably in corresponding stratum;
Above-mentioned rock core sheet diameter range is 5mm ~ 50mm, and thickness range is 1mm ~ 5mm, and nano material is the dewatering nano SiO with 5～200nm particle diameter
2Particle, or TiO
2Particle, or ZnO particle, or other hydrophobic nanoparticles.
The present invention has following outstanding advantage compared with prior art:
This fast appraisement method can judge qualitatively whether the nano material of being developed has step-down augmented injection effect to specific low permeability reservoir; Have only when SEM detects nanometer absorption and contact angle less than 120 °; Just carry out the rock core flowing experiment evaluation, this can reduce rock core flowing experiment significantly in the R&D process of nano material number of times, not only reduced actual rock core consumption, practiced thrift cost; And can shorten indoor evaluation time (about 40%), accelerated the research and development process of nano material.
Description of drawings
Fig. 1 is that the present invention estimates process flow diagram fast;
Fig. 2 is the rock core sheet scanned photograph of not adsorbing nano particle;
Fig. 3 is the rock core sheet scanned photograph of having adsorbed nano particle;
Fig. 4 is the contact angle test result of not adsorbing nano particle rock core sheet surface;
Fig. 5 is the contact angle test result of having adsorbed nano particle rock core sheet surface;
Water measuring pressure gradient-discharge diagram before and after the absorption of Fig. 6 nano particle.
Embodiment
Below in conjunction with accompanying drawing and embodiment the inventive method is further specified.
As shown in Figure 1, a kind of nano particle absorption method reduces the fast appraisement method of petroleum reservoir microchannel resistance to water-flow effect, utilizes ESEM, contact angle test result to come to estimate fast drag-reduction effect.Concrete steps are following:
1) will specify the rock core sheet on stratum in nanoparticulate dispersion, to soak more than 24 hours, and make nano particle in rock core sheet surface adsorption, and subsequently the rock core sheet taken out, flushing is also dry;
2) utilize the contact angle tester to measure the apparent contact angle of water droplet on the rock core sheet, with ESEM the rock core sheet is scanned again;
3) judge fast according to test result that as long as scanning result shows nano particle in rock core sheet surface adsorption, and the contact angle test result just can judge that greater than 120 ° this nano material has drag-reduction effect preferably in corresponding stratum;
Above-mentioned rock core sheet diameter range is 5mm ~ 50mm, and thickness range is 1mm ~ 5mm, and nano material is the dewatering nano SiO with 5～200nm particle diameter
2Particle, or TiO
2Particle, or ZnO particle, or other hydrophobic nanoparticles.
Embodiment:
The characteristic of lab scale nano material: the dewatering nano SiO of preparation
2Material, grain diameter is about 10～40nm, specific surface area 350～380m
2/ g, Huo Huadu>99%.
Scanning result: Fig. 2 is not for adsorbing the rock core sheet of nano particle, and Fig. 3 is the SEM photo that has adsorbed the rock core sheet surface of nano particle.As can be seen from the figure, nano particle has better absorption on rock core sheet surface.
The contact angle test result: tested the surperficial contact angle of rock core sheet with OCA30, the result sees Fig. 4 and Fig. 5.The rock core sheet surperficial contact angle of Fig. 4 for not adsorbing nano particle, Fig. 5 are the contact angle that has adsorbed the rock core sheet surface of nano particle.Find out that from figure before the absorption nano particle, rock core sheet surface is a strong hydrophilicity, adsorb nano particle after, the water droplet contact angle reaches 126.6 °, greater than 120 °, can know this nano material for given block have step-down augmented injection effect.
In order to verify the validity of this fast appraisement method, carried out rock core flowing experiment with the lab scale nanometer.The perm-plug method of used rock core is 16.337mDa, and factor of porosity is 0.098, and long is 6.69cm, and diameter is 2.5cm.Fig. 6 is the pressure gradient-discharge diagram of experiment gained.Can get
according to expansion Darcy's law calculating;
; Permeability has improved 42.5%, and this has directly verified the validity of this fast appraisement method.
Claims (3)
1. the fast appraisement method of a nano particle absorption method reduction petroleum reservoir microchannel resistance to water-flow effect is characterized in that, utilizes ESEM, contact angle test result to come to estimate fast drag-reduction effect; Concrete steps are following:
1) will specify the rock core sheet on stratum in nanoparticulate dispersion, to soak more than 24 hours, and make nano particle in rock core sheet surface adsorption, and subsequently the rock core sheet taken out, flushing is also dry;
2) utilize the contact angle tester to measure the apparent contact angle of water droplet on the rock core sheet, with ESEM the rock core sheet is scanned again;
3) judge fast according to test result that as long as scanning result shows nano particle in rock core sheet surface adsorption, and the contact angle test result just can judge that greater than 120 ° this nano material has drag-reduction effect preferably in corresponding stratum.
2. a kind of nano particle absorption method according to claim 1 reduces the fast appraisement method of petroleum reservoir microchannel resistance to water-flow effect, it is characterized in that said rock core sheet diameter range is 5mm ~ 50mm, and thickness range is 1mm ~ 5mm.
3. a kind of nano particle absorption method according to claim 1 reduces the fast appraisement method of petroleum reservoir microchannel resistance to water-flow effect, it is characterized in that said nano material is the dewatering nano SiO with 5～200nm particle diameter
2Particle, or TiO
2Particle, or ZnO particle, or other hydrophobic nanoparticles.
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| CN201110418804XA CN102519995A (en) | 2011-12-15 | 2011-12-15 | Method for rapidly evaluating effect of reducing resistance of water flow in petroleum reservoir stratum micro-channel by adopting nanoparticle adsorption method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879304A (en) * | 2012-09-26 | 2013-01-16 | 上海大学 | Method for testing scouring resistance of adsorption layer of solid surface |
| CN103256032A (en) * | 2013-05-31 | 2013-08-21 | 中国地质大学（北京） | Method for enhancing water injecting capacity of hypotonic oil field by utilizing nano-powder material |
| CN105255470A (en) * | 2015-11-10 | 2016-01-20 | 西南石油大学 | Composite nanometer SiO<2> pressure-lowering and injection-augmenting agent and preparation method thereof |
| CN108061694A (en) * | 2017-12-05 | 2018-05-22 | 太原理工大学 | A kind of water droplet is in the computational methods of surface of solids contact angle |
| CN108398202A (en) * | 2018-04-28 | 2018-08-14 | 中国石油大学(华东) | A kind of device and its measurement method measuring superfine powder raft tension |
| CN112362536A (en) * | 2020-11-10 | 2021-02-12 | 中国石油大学(华东) | Evaluation method of sandstone surface micro-wettability based on atomic force microscope |
| CN113887113A (en) * | 2021-09-01 | 2022-01-04 | 中海油田服务股份有限公司 | Method for representing adsorption mechanism of biological nanoparticles in micro-channel of petroleum reservoir |
| CN114324066A (en) * | 2021-12-30 | 2022-04-12 | 中海油田服务股份有限公司 | Evaluation method of modified nano material for rock core |
-
2011
- 2011-12-15 CN CN201110418804XA patent/CN102519995A/en active Pending
Non-Patent Citations (2)
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| 顾元春: "《石油储层微孔道纳米减阻机理研究》", 《中国博士学位论文全文数据库（电子期刊）》 * |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879304A (en) * | 2012-09-26 | 2013-01-16 | 上海大学 | Method for testing scouring resistance of adsorption layer of solid surface |
| CN102879304B (en) * | 2012-09-26 | 2014-12-03 | 上海大学 | Method for testing scouring resistance of adsorption layer of solid surface |
| CN103256032A (en) * | 2013-05-31 | 2013-08-21 | 中国地质大学（北京） | Method for enhancing water injecting capacity of hypotonic oil field by utilizing nano-powder material |
| CN105255470A (en) * | 2015-11-10 | 2016-01-20 | 西南石油大学 | Composite nanometer SiO<2> pressure-lowering and injection-augmenting agent and preparation method thereof |
| CN108061694A (en) * | 2017-12-05 | 2018-05-22 | 太原理工大学 | A kind of water droplet is in the computational methods of surface of solids contact angle |
| CN108061694B (en) * | 2017-12-05 | 2020-06-09 | 太原理工大学 | Method for calculating contact angle of water drop on solid surface |
| CN108398202B (en) * | 2018-04-28 | 2019-12-17 | 中国石油大学(华东) | Device and method for measuring tension of superfine powder raft |
| CN108398202A (en) * | 2018-04-28 | 2018-08-14 | 中国石油大学(华东) | A kind of device and its measurement method measuring superfine powder raft tension |
| CN112362536A (en) * | 2020-11-10 | 2021-02-12 | 中国石油大学(华东) | Evaluation method of sandstone surface micro-wettability based on atomic force microscope |
| CN113887113A (en) * | 2021-09-01 | 2022-01-04 | 中海油田服务股份有限公司 | Method for representing adsorption mechanism of biological nanoparticles in micro-channel of petroleum reservoir |
| CN113887113B (en) * | 2021-09-01 | 2024-04-30 | 中海油田服务股份有限公司 | Method for characterizing biological nanoparticle adsorption mechanism in petroleum reservoir micro-channel |
| CN114324066A (en) * | 2021-12-30 | 2022-04-12 | 中海油田服务股份有限公司 | Evaluation method of modified nano material for rock core |
| CN114324066B (en) * | 2021-12-30 | 2023-09-12 | 中海油田服务股份有限公司 | Evaluation method of modified nanomaterial for core |
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Application publication date: 20120627 |