CN105606516A - Method for testing and evaluating alkali sensitivity of hydrocarbon reservoir - Google Patents
Method for testing and evaluating alkali sensitivity of hydrocarbon reservoir Download PDFInfo
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- CN105606516A CN105606516A CN201610152326.5A CN201610152326A CN105606516A CN 105606516 A CN105606516 A CN 105606516A CN 201610152326 A CN201610152326 A CN 201610152326A CN 105606516 A CN105606516 A CN 105606516A
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- salt solution
- rock core
- oil
- saline water
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- 239000003513 alkali Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 title claims abstract description 9
- 239000004215 Carbon black (E152) Substances 0.000 title abstract description 7
- 229930195733 hydrocarbon Natural products 0.000 title abstract description 7
- 150000002430 hydrocarbons Chemical class 0.000 title abstract description 7
- 230000035945 sensitivity Effects 0.000 title abstract 3
- 239000011435 rock Substances 0.000 claims abstract description 18
- 230000035699 permeability Effects 0.000 claims abstract description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 11
- 239000011780 sodium chloride Substances 0.000 claims abstract description 11
- 239000008398 formation water Substances 0.000 claims abstract description 4
- 239000012266 salt solution Substances 0.000 claims description 24
- 238000011156 evaluation Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002734 clay mineral Substances 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 1
- 238000009738 saturating Methods 0.000 abstract 1
- 239000000741 silica gel Substances 0.000 abstract 1
- 229910002027 silica gel Inorganic materials 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 37
- 239000005416 organic matter Substances 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 238000009795 derivation Methods 0.000 description 3
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000090 biomarker Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a method for testing and evaluating the alkali sensitivity of a hydrocarbon reservoir. The method comprises the following steps: preparing saline water with different pH values; according to actual conditions, gradually raising the pH value from the pH value of formation water, wherein the pH value of the saline water of the final grade can be set to 12; vacuumizing a selected rock core and saturating with the saline water of the first grade; immersing for 20-24 hours; under the condition that the flow speed is lower than a critical flow speed, testing stable permeability K1 of the rock core with the saline water of the first grade; injecting the saline water of the second grade and immersing for 20-24 hours; under the condition that the flow speed is lower than the critical flow speed, determining stable permeability K2 of the rock core with the saline water of the second grade; and changing the grade of the injected saline water until stable permeability Kn of the rock core treated by the saline water of the final grade is tested. According to the method disclosed by invention, the alkali sensitivity of the hydrocarbon reservoir is tested to obtain an accurate numerical value; the problems that structures of clay minerals and silica gel knots in the hydrocarbon reservoir are damaged after fluid with the high pH value is injected into the hydrocarbon reservoir so that the hydrocarbon reservoir is blocked and damaged can be prevented.
Description
Technical field
The present invention relates to a kind of method, especially relate to a kind of method based on to the test evaluation of the quick property of oil-gas Layer alkali.
Background technology
Oil gas is to follow oil gas out from oil well, and main component is methane, ethane etc. As fuel and chemical industryRaw material. Oil gas generates following condition, first, see organic quantity in source bed number, be commonly referred to " organic richDegree ". Mainly measure wherein residual organic carbon content, to determine that an area has or not source bed, has how many source beds, and itSource bed that be divided into by certain standard, medium with poor, carry out evaluation of classification. The second, see in source bed organicThe quality of matter quality, is commonly referred to " organic matter type ". According to biogenetic derivation, the kerogen of oil generation matrix is divided into three major types.The first kind is sapropelic organic matters, and biogenetic derivation is mainly the plankton in water, for I type kerogen, belongs to top-qualityOrganic. Equations of The Second Kind is that type organic matter is planted in corruption, and biogenetic derivation is mainly higher plant, for III type kerogen, belongs to second-rateOrganic. The 3rd class is between the mixed type organic matter between the two, is II type kerogen, is that quality is organic preferably. RealTest chamber by the analysis result to sample, by regional organic matter type of certain standard, to organic qualityMake evaluation. The 3rd, see whether organic matter has generated oily gentle, be commonly referred to " organic maturity ", when possessingAfter the organic matter of some and quality changes into oil under certain conditions. In other words, if do not possess generation oil" duration and degree of heating ", what real value organic at most, preferably do not have yet. Very important so study organic maturityA ring. Analyze the information that data provide, can indirectly reflect the organic temperature course in underground experience. According to these numbersAccording to, maturity be divided into immature, oil generation peak, moisture, dry gas (dry gas refers to that its origin cause of formation is relevant with oil, and containing ethane withOn heavy hydrocarbon little, the more than 95% flammable natural gas of methane content. Composition as for biogas and coal-type gas is close therewith, butOrigin cause of formation difference, shoulds be regarded as a different matter. ) etc. four-stage. Evaluate organic matter and be in what stage of ripeness, can tell people on certain groundDistrict is conducive to oil prospecting or gas finding. The 4th, see that the oil of generation or gas, from that source bed, are commonly referred to " oil sourcesContrast ". Finding after oil gas, using " fingerprint compound " (or claim biomarker) that oil gas and oil source rock are carried out rightRatio, explores the affiliation between oil source rock and oil gas, and the oil that research institute generates is gentle to that source bed. Be not difficult to thinkResemble, provide the source bed of oil sources more, oil sources is just abundanter, just more favourable to forming oil gas field. In existing recovery process, do not haveHave these infringements are tested, occur infringement after causing oil-gas Layer exploitation a period of time, production efficiency is affected. GroundLayer water pH value is generally neutrality or alkalescent, and the pH value of most of drilling fluids is between 8 ~ 12, the caustic waterflooding in secondary oil recoveryAlso there is higher pH value. When high pH value fluid enters after oil-gas Layer, oil-gas Layer CLAY MINERALS AND THEIR SIGNIFICANCE and siliceous cementing knot will be causedStructure destroys (being mainly release microparticles after clay mineral cleavage and cement dissolve), thereby causes the obstruction infringement of oil-gas Layer; ThisOutward, a large amount of hydroxyls and some divalence sun, from conjunction with generating insoluble matter, cause the obstruction infringement of oil-gas Layer.
Summary of the invention
The object of the invention is to overcome in above-mentioned existing recovery process and these infringements are not tested, cause oil gasAfter layer exploitation a period of time, there is infringement, make the affected problem of production efficiency, designed a kind of based on to oil-gas Layer alkaliThe method of quick property test evaluation, the method, by the quick property of the alkali of oil-gas Layer is tested, obtains numerical value accurately, can preventHigh pH value fluid enters after oil-gas Layer, will cause oil-gas Layer CLAY MINERALS AND THEIR SIGNIFICANCE and siliceous cementing structural deterioration, thereby causes oilThe obstruction infringement of gas-bearing formation; A large amount of hydroxyls and some divalence sun, from conjunction with generating insoluble matter, cause the obstruction of oil-gas LayerThe problem of infringement occurs.
Object of the present invention is achieved through the following technical solutions: based on the method to the test evaluation of the quick property of oil-gas Layer alkali, and bagDraw together following steps:
(1) preparation of different pH value salt solution, according to actual conditions, be from the pH value of formation water, the pH value that raises step by step, lastOne-level salt solution pH value can be decided to be 12;
(2) by saturated the rock core vacuumizing of choosing first order salt solution, and soak 20 ~ 24h, under the condition lower than critical flow velocity,Measure the stable permeability K of rock core with first order salt solution1；
(3) inject second level salt solution, soak 20 ~ 24h, under the condition lower than critical flow velocity, measure rock core with second level salt solutionStable permeability K2；
(4) change and inject the rank of salt solution, repeat (3) step, until measure the stable of rock core after afterbody saline treatmentPermeability Kn，pHi-1The permeability K of salt solutioni-1With pHiThe permeability K of salt solutioniBetween meet relational expression
Illustrate that alkali occurs is quick, pHi-1Be critical pH.
The quick property of alkali refer to alkali lye enter behind stratum with stratum in the quick mineral of alkali and formation fluid react, produce precipitationOr discharge particulate, the phenomenon that in-place permeability is declined.
In sum, the invention has the beneficial effects as follows: the method, by the quick property of the alkali of oil-gas Layer is tested, obtains standardTrue numerical value, can prevent that high pH value fluid from entering after oil-gas Layer, will cause oil-gas Layer CLAY MINERALS AND THEIR SIGNIFICANCE and siliceous cementing knotStructure destroys, thereby causes the obstruction infringement of oil-gas Layer; A large amount of hydroxyls and some divalence sun from conjunction with can generate insoluble matter,Cause the problem of the obstruction infringement of oil-gas Layer to occur.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only toThis.
Embodiment:
Based on the method to the test evaluation of the quick property of oil-gas Layer alkali, comprise the following steps:
(1) preparation of different pH value salt solution, according to actual conditions, be from the pH value of formation water, the pH value that raises step by step, lastOne-level salt solution pH value can be decided to be 12;
(2) by saturated the rock core vacuumizing of choosing first order salt solution, and soak 20 ~ 24h, under the condition lower than critical flow velocity,Measure the stable permeability K of rock core with first order salt solution1；
(3) inject second level salt solution, soak 20 ~ 24h, under the condition lower than critical flow velocity, measure rock core with second level salt solutionStable permeability K2；
(4) change and inject the rank of salt solution, repeat (3) step, until measure the stable of rock core after afterbody saline treatmentPermeability Kn，pHi-1The permeability K of salt solutioni-1With pHiThe permeability K of salt solutioniBetween meet relational expression
Illustrate that alkali occurs is quick, pHi-1Be critical pH.
The method, by the quick property of the alkali of oil-gas Layer is tested, obtains numerical value accurately, can prevent high pH value fluidEnter after oil-gas Layer, will cause oil-gas Layer CLAY MINERALS AND THEIR SIGNIFICANCE and siliceous cementing structural deterioration, thereby cause the obstruction of oil-gas LayerInfringement; A large amount of hydroxyls and some divalence sun, from conjunction with generating insoluble matter, cause the problem of the obstruction infringement of oil-gas LayerOccur.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, every complying withAny simple modification, the equivalent variations in fact above embodiment done according to technology of the present invention, method, all fall into the present inventionProtection domain within.
Claims (1)
1. the method based on to the test evaluation of the quick property of oil-gas Layer alkali, is characterized in that, comprises the following steps:
(1) preparation of different pH value salt solution, according to actual conditions, be from the pH value of formation water, the pH value that raises step by step, lastOne-level salt solution pH value can be decided to be 12;
(2) by saturated the rock core vacuumizing of choosing first order salt solution, and soak 20 ~ 24h, under the condition lower than critical flow velocity,Measure the stable permeability K of rock core with first order salt solution1；
(3) inject second level salt solution, soak 20 ~ 24h, under the condition lower than critical flow velocity, measure rock core with second level salt solutionStable permeability K2；
(4) change and inject the rank of salt solution, repeat the 3. step, until the stable of rock core of measuring after afterbody saline treatment oozesRate K thoroughlyn，pHi-1The permeability K of salt solutioni-1With pHiThe permeability K of salt solutioniBetween meet relational expression
Illustrate that alkali occurs is quick, pHi-1Be critical pH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610152326.5A CN105606516A (en) | 2016-03-17 | 2016-03-17 | Method for testing and evaluating alkali sensitivity of hydrocarbon reservoir |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610152326.5A CN105606516A (en) | 2016-03-17 | 2016-03-17 | Method for testing and evaluating alkali sensitivity of hydrocarbon reservoir |
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| CN105606516A true CN105606516A (en) | 2016-05-25 |
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| CN201610152326.5A Pending CN105606516A (en) | 2016-03-17 | 2016-03-17 | Method for testing and evaluating alkali sensitivity of hydrocarbon reservoir |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204937A (en) * | 2016-12-19 | 2018-06-26 | 中国石油天然气股份有限公司 | Method for measuring water sensitivity of tight gas reservoir core |
Citations (6)
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| CN1588053A (en) * | 2004-09-20 | 2005-03-02 | 大庆油田有限责任公司 | Method for evaluating hydrocarbon primary rock producing hydrocarbon ability using drilling well liquid pyrolytic well logging |
| JP2007309712A (en) * | 2006-05-17 | 2007-11-29 | Kajima Corp | Method of evaluating ground water flow |
| CN101413870A (en) * | 2008-11-24 | 2009-04-22 | 北京联合大学 | Experimental apparatus and method for measuring rock permeation rate |
| CN102182444A (en) * | 2011-04-01 | 2011-09-14 | 中国石油集团川庆钻探工程有限公司 | Under-balanced drilling adaptability evaluation method |
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| CN105067794A (en) * | 2015-07-24 | 2015-11-18 | 成都理工大学 | Method for testing water sensitivity, salt sensitivity and alkali sensitivity of shale reservoir stratum |
-
2016
- 2016-03-17 CN CN201610152326.5A patent/CN105606516A/en active Pending
Patent Citations (6)
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| CN1588053A (en) * | 2004-09-20 | 2005-03-02 | 大庆油田有限责任公司 | Method for evaluating hydrocarbon primary rock producing hydrocarbon ability using drilling well liquid pyrolytic well logging |
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| CN102182444A (en) * | 2011-04-01 | 2011-09-14 | 中国石油集团川庆钻探工程有限公司 | Under-balanced drilling adaptability evaluation method |
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Non-Patent Citations (1)
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| 朱斌等: "《SY/T 5358-2002 中华人民共和国石油天然气行业标准》", 28 May 2002 * |
Cited By (1)
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Application publication date: 20160525 |