CN104419398A - Micro-emulsion fracturing fluid for oil well - Google Patents
Micro-emulsion fracturing fluid for oil well Download PDFInfo
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- CN104419398A CN104419398A CN201310411487.8A CN201310411487A CN104419398A CN 104419398 A CN104419398 A CN 104419398A CN 201310411487 A CN201310411487 A CN 201310411487A CN 104419398 A CN104419398 A CN 104419398A
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- oil well
- micro emulsion
- fracturing liquid
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
Abstract
The invention relates to a micro-emulsion fracturing fluid for an oil well. The fracturing fluid is characterized by being prepared from the following components in parts by mass: 65-99.99 parts of a base fluid and 0.01-35.0 parts of cross linking fluid, wherein the base fluid is prepared from the following components in parts by mass: 95-99.5 parts of water, 0.1-1.0 part of a thickening agent, 0.1-1.0 part of a micro-emulsion additive, 0.1-1.0 part of a clay stabilizer, 0.1-1.0 part of a pH regulator and 0.1-1.0 part of bactericide. The unique properties, such as reducing surface/interfacial tension, changing wetting angles on a rock surface, relieving water locking damage and the like, of micro-emulsion are utilized; moreover, different from other surfactant systems, the micro-emulsion has excellent properties, such as tiny nanoparticles, extremely strong solubility enhancement, superlow interfacial tension, thermodynamic stability and the like, can be used for improving the fracturing assistance ratio of the fracturing fluid, and has an important meaning to productivity and injection increase after fracturing.
Description
Technical field
The present invention relates to a kind of fracturing liquid, particularly a kind of oil well micro emulsion fracturing liquid for using in wellfracturing yield-increasing technique.
Background technology
Along with the domestic demand to petroleum products continues to increase and the improving constantly of Exploration of Oil And Gas technology, the exploitation of low permeability oil field is subject to increasing attention.Because low-permeability oil deposit exists low pressure, hypotonic, natural fracture grows the factors such as imperfection, and exploitation tool acquires a certain degree of difficulty.Current LOW PERMEABILITY OILFIELD DEVELOPMENT is generally by the yield-increasing technology such as waterfrac treatment and acidifying, link up the circulation between natural fracture, form oil gas flow passage, the object reaching volume increase or go into operation, waterfrac treatment makes large quantities of low pressure and low permeability oil-gas field obtain effective exploitation.The hypotonic reserves in oil field, Midwest of China account for very large proportion, the exploitation of low-permeability oilfield, are generally undertaken going into operation or increasing production by waterfrac treatment or even refracturing.Therefore, after working design, pressing crack construction process and pressure break before the links pressure break of waterfrac treatment, the of the fracturing fluid row of returning in time, all should cause enough attention.
Up to the present, fracturing fluid recovery (backflow) has fed back a lot of problem at engineering site, mainly comprise three aspects: one is do not select control proppants settle down migration rational opportunity, proppant backflow is caused to arrive pit shaft, make propping agent in payzone seldom or irrational distribution, reduce the flow conductivity in crack to a great extent, serious meeting causes failed, the crack of pressing crack construction to be lost efficacy; Two is that to return the control of discharge capacity bad, makes backflow propping agent go out well head, destroys blowout oil nozzle and other equipment.Three is that fracturing fluid recovery (backflow) rate is low, and formation causes serious injury, and have impact on effect of increasing production.In low permeability reservoir, after hydraulic fracturing job pressure, the row's of returning problem seems more outstanding.
Frac job inevitably brings a large amount of outside fluids (aqueous fracturing fluid of main use at present and acid solution) into, various physics chemical action is there is between sensitive minerals and resident fluid in meeting and formation rock after external stimulation fluids filtrate enters stratum, payzone is made to be subject to the injury of solid phase, liquid phase, affect the throughput on stratum, effect of increasing production after directly impact pressure.Fracturing liquid filter loss is in the earth formation larger, and the time stopped in the earth formation is longer, and the extent of injury of formation is larger.Therefore, after improving of the fracturing fluid pressure, the row of returning leads and plays vital effect to the effect of waterfrac treatment.The of the fracturing fluid row of returning has multiple method, and in all kinds of rows of returning mechanism, the research of fracturing liquid cleanup additive is subject to increasing attention.
Summary of the invention
Object of the present invention is in order to solve the problem, a kind of oil well micro emulsion fracturing liquid is provided, it is by utilizing the special property of microemulsion as reduction table/interfacial tension, changing rock surface wetting angle, removing water blocking damage etc., to microemulsion system and the application of nanoemulsions in volume increase of studying microemulsion and dilution, there is important meaning.Simultaneously, microemulsion differs from the advantageous property of other surfactant system as the research of minimum nano particle, extremely strong lyotropy, ultralow interfacial tension, thermodynamic stability etc., in pressure break, improve to microemulsion-type cleanup additive the row of helping to lead, after improving pressure break, increasing yield and injection is significant.
Technical scheme of the present invention is: a kind of oil well micro emulsion fracturing liquid, is characterized in that: described fracturing liquid is formed by composite by the base fluid of 65 ~ 99.99 parts and the crosslinked fluid of 0.01 ~ 35.0 part; Described base fluid is made up of the water of 95 ~ 99.5 parts, the viscosifying agent of 0.1 ~ 1.0 part, the micro emulsion additive of 0.1 ~ 1.0 part, the clay stabilizer of 0.1 ~ 1.0 part, the pH value regulator of 0.1 ~ 1.0 part, the sterilant of 0.1 ~ 1.0 part, and above-mentioned number is mass parts.
Described crosslinked fluid comprises water and 0.1 ~ 100.0 part of linking agent of 0 ~ 99.9 part.
Described viscosifying agent is hydroxypropylguar gum CJ2-6; Described clay stabilizer is clay stabilizer COP-1; Described pH value regulator is conditioning agent CJ-3; Described sterilant is sterilant CJSJ-2.
Described micro emulsion additive mixes gained emulsion by positive structure 12 carbon alkane, n-hexyl alcohol, sodium-chlor, emulsifier op-10 by the weight ratio of 5: 5:0.4:0.002.
Described crosslinked fluid can also comprise the gel breaker that mass parts is 0.001 ~ 0.5 part.
Described linking agent is the organic or inorganic compound of borax, Sodium Tetraborate, triethanolamine borate and boron.
Described gel breaker is ammonium persulphate, Potassium Persulphate, hydrogen peroxide, benzoyl peroxide, cellulase or glycanase.
The compound method of described base fluid is: when stirring with pump circulation or agitator, the viscosifying agent of formula ratio is slowly added in the water of formula ratio, continue circulation or stir 10 minutes, liquid is fully mixed, add micro emulsion additive, sterilant, clay stabilizer, the pH value regulator of formula ratio more successively, continue circulation 20min, make viscosifying agent fully swelling, form uniform liquid.
Described fracturing liquid is applicable to use at the oil well of well temperature within 100 DEG C.
Advantage of the present invention is:
1, ultralow surface and interface tension force can promote the row of returning of fracturing liquid raffinate well, and shop experiment is returned row and led and reach more than 90%.
2, superpower characteristic of solubilizing, makes the solid of indissoluble or the solubleness of liquid significantly increase, thus removes the blocking on formation scaling or stratum well, plays stratum repair well.
3, the water lock of liquid formation can be effectively reduced.
4, fracturing liquid of the present invention is applicable to use at the oil well of well temperature within 100 DEG C.
Illustrate fracturing liquid of the present invention further below in conjunction with specific embodiment, but embodiment does not limit the scope of the invention.
Embodiment
Embodiment 1
30m at the scene
329646Kg water is added in container, when stirring with pump circulation or agitator, slowly add 105Kg viscosifying agent, continue circulation or stir 10 minutes, add micro emulsion additive 150Kg, sterilant 30Kg, clay stabilizer 150Kg, pH value regulator 24Kg more successively, continue circulation 20min, make viscosifying agent fully swelling, form uniform base fluid.
5m at the scene
34967.5Kg water is added in container, when stirring with pump circulation or agitator, adding 17.5Kg borax and 15Kg ammonium persulphate, continuing circulation or stirring 30 minutes, so that borax and ammonium persulphate dissolve and mix fully, formed containing gel breaker, content is the crosslinked fluid of 0.35% borax.
During pressing crack construction, while infusion base fluid, by by base fluid: crosslinked fluid=100 liter: the volume ratio of 8 ~ 12 liters is carried out mixing and formed fracturing liquid.
Above fracturing liquid is recommended in well temperature for the oil well being no more than 90 DEG C and uses.
Described linking agent can also be the organic or inorganic compound of Sodium Tetraborate, triethanolamine borate and boron except borax.
Here ammonium persulphate is gel breaker, and described gel breaker can also be Potassium Persulphate, hydrogen peroxide, benzoyl peroxide, cellulase or glycanase.
Described viscosifying agent is hydroxypropylguar gum CJ2-6; Described micro emulsion additive mixes gained emulsion by positive structure 12 carbon alkane, n-hexyl alcohol, sodium-chlor, emulsifier op-10 by the weight ratio of 5: 5:0.4:0.002; Described clay stabilizer is clay stabilizer COP-1; Described pH value regulator is conditioning agent CJ-3; Described sterilant is sterilant CJSJ-2; Above-mentioned chemical reagent all celebrates Chemical Group down-hole auxiliary agent company, postcode 712000 purchased from Xi'an is long.
Embodiment 2
30m at the scene
329646Kg water is added in container, when stirring with pump circulation or agitator, slowly add 105Kg viscosifying agent, continue circulation or stir 10 minutes, add micro emulsion additive 150Kg, sterilant 30Kg, clay stabilizer 150Kg, pH value regulator 24Kg more successively, continue circulation 20min, make viscosifying agent fully swelling, form uniform base fluid.
2m at the scene
3organic borate cross-linker 2000Kg in container, when stirring with pump circulation or agitator, adds 50Kg ammonium persulphate, continues circulation or stirs 30 minutes, so that organic borate cross-linker dissolves with ammonium persulphate and mixes fully, forms the crosslinked fluid containing gel breaker.
During pressing crack construction, while infusion base fluid, by by base fluid: crosslinked fluid=100 liter: the volume ratio of 0.4 ~ 0.8 liter is carried out mixing and formed fracturing liquid.
Above fracturing liquid is recommended in well temperature for the oil well being no more than 100 DEG C and uses.
Described micro emulsion additive mixes gained emulsion by positive structure 12 carbon alkane, n-hexyl alcohol, sodium-chlor, emulsifier op-10 by the weight ratio of 5: 5:0.4:0.002; Described viscosifying agent, clay stabilizer, pH value regulator, sterilant can be identical with embodiment 1, also can be the mentioned reagent of other model.Chemical reagent in the present embodiment all can directly in market is directly buied.
Embodiment 3
30m at the scene
329670Kg water is added in container, when stirring with pump circulation or agitator, slowly add 105Kg viscosifying agent, continue circulation or stir 10 minutes, add micro emulsion additive 90Kg, sterilant 30Kg, clay stabilizer 180Kg, pH value regulator 30Kg more successively, continue circulation 20min, make viscosifying agent fully swelling, form uniform base fluid.
5m at the scene
34967.5Kg water is added in container, when stirring with pump circulation or agitator, adding 17.5Kg borax and 15Kg ammonium persulphate, continuing circulation or stirring 30 minutes, so that borax and ammonium persulphate dissolve and mix fully, formed containing gel breaker, content is the crosslinked fluid of 0.35% borax.
During pressing crack construction, while infusion base fluid, by by base fluid: crosslinked fluid=100 liter: the volume ratio of 8 ~ 12 liters is carried out mixing and formed fracturing liquid.
Above fracturing liquid is recommended in well temperature for the oil well being no more than 90 DEG C and uses.
Described micro emulsion additive, viscosifying agent, clay stabilizer, pH value regulator, sterilant are all identical with embodiment 1.
Embodiment 4
30m at the scene
329616Kg water is added in container, when stirring with pump circulation or agitator, slowly add 105Kg viscosifying agent, continue circulation or stir 10 minutes, add micro emulsion additive 120Kg, sterilant 30Kg, clay stabilizer 150Kg, pH value regulator 24Kg more successively, continue circulation 20min, make viscosifying agent fully swelling, form uniform base fluid.
5m at the scene
34967.5Kg water is added in container, when stirring with pump circulation or agitator, adding 17.5Kg borax and 15Kg ammonium persulphate, continuing circulation or stirring 30 minutes, so that borax and ammonium persulphate dissolve and mix fully, formed containing gel breaker, content is the crosslinked fluid of 0.35% borax.
During pressing crack construction, while infusion base fluid, by by base fluid: crosslinked fluid=100 liter: the volume ratio of 8 ~ 12 liters is carried out mixing and formed fracturing liquid.
Above fracturing liquid is recommended in well temperature for the oil well being no more than 90 DEG C and uses.
Described micro emulsion additive, viscosifying agent, clay stabilizer, pH value regulator, sterilant are all identical with embodiment 1.
Embodiment 5
10m at the scene
39750Kg water is added in container, when stirring with pump circulation or agitator, slowly add 50Kg viscosifying agent, continue circulation or stir 10 minutes, liquid is fully mixed, then add successively micro emulsion additive 50Kg, sterilant 50 Kg, clay stabilizer 50Kg, pH value regulator 50Kg, continue circulation 30min, make viscosifying agent fully swelling, form uniform liquid, that is: base fluid.
1m at the scene
3500Kg water is added in container, when stirring with pump circulation or agitator, adding linking agent 499Kg, 1Kg ammonium persulphate successively, continuing circulation or stirring 30 minutes, so that linking agent dissolves with ammonium persulphate and mixes fully, form the crosslinked fluid containing gel breaker.Described linking agent is borax.Described linking agent can also be the organic or inorganic compound of Sodium Tetraborate, triethanolamine borate and boron.Here ammonium persulphate is gel breaker, and described gel breaker can also be Potassium Persulphate, hydrogen peroxide, benzoyl peroxide, cellulase or glycanase.
The of the fracturing fluid preparation of oil well micro emulsion: get above-mentioned 750Kg base fluid and 200Kg crosslinked fluid fully mixes and composite formation fracturing liquid of the present invention.
Described micro emulsion additive, viscosifying agent, clay stabilizer, pH value regulator, sterilant are all identical with embodiment 1.
Above fracturing liquid is recommended in well temperature for the oil well being no more than 90 DEG C and uses.
Embodiment 6
10m at the scene
39950Kg water is added in container, when stirring with pump circulation or agitator, slowly add 10Kg viscosifying agent, continue circulation or stir 10 minutes, liquid is fully mixed, then add successively micro emulsion additive 10Kg, sterilant 10 Kg, clay stabilizer 10Kg, pH value regulator 10Kg, continue circulation 30min, make viscosifying agent fully swelling, form uniform liquid, that is: base fluid.
1m at the scene
3add 999Kg water in container, when stirring with pump circulation or agitator, adding linking agent 1Kg and continue circulation or stir 30 minutes, so that linking agent dissolves fully, forming crosslinked fluid.Described linking agent is triethanolamine borate.
The of the fracturing fluid preparation of oil well micro emulsion: get above-mentioned 650Kg base fluid and 350Kg crosslinked fluid fully mixes and composite formation fracturing liquid of the present invention.
Described micro emulsion additive, viscosifying agent, clay stabilizer, pH value regulator, sterilant are all identical with embodiment 1.
Above fracturing liquid is recommended in well temperature for the oil well being no more than 95 DEG C and uses.
Embodiment 7
10m at the scene
39500Kg water is added in container, when stirring with pump circulation or agitator, slowly add 100Kg viscosifying agent, continue circulation or stir 10 minutes, liquid is fully mixed, then add successively micro emulsion additive 100Kg, sterilant 100 Kg, clay stabilizer 100Kg, pH value regulator 100Kg, continue circulation 30min, make viscosifying agent fully swelling, form uniform liquid, that is: base fluid.
Described crosslinked fluid is 1000Kg linking agent, and described linking agent is Sodium Tetraborate.
The of the fracturing fluid preparation of oil well micro emulsion: get above-mentioned 999.9Kg base fluid and 0.1Kg crosslinked fluid fully mixes and composite formation fracturing liquid of the present invention.
Described micro emulsion additive, viscosifying agent, clay stabilizer, pH value regulator, sterilant are all identical with embodiment 1.
Above fracturing liquid is recommended in well temperature for the oil well being no more than 85 DEG C and uses.
The present invention utilizes the special property of microemulsion (micro emulsion additive), as reduced table/interfacial tension, changing rock surface wetting angle, removing water blocking damage etc., simultaneously, microemulsion has the advantageous property of the surfactant system differing from other, as features such as minimum nano particle, extremely strong lyotropy, ultralow interfacial tension, thermodynamic stabilities, improve the of the fracturing fluid row of helping of the present invention to lead, significant to increasing yield and injection after pressure break.
Spot effect statistics (table 1):
The fracturing liquid of table 1 fracturing liquid of the present invention and prior art contrasts and is contrasted can be drawn by table 1, fracturing fluid recovery (backflow) rate of the present invention and day produce oil all exceed the fracturing liquid of prior art.Fracturing liquid prepared by same employing embodiment 2,3,4,6,7 is compared with the fracturing liquid of prior art, and its effect is consistent with table 1.
The part that the present embodiment does not describe in detail and english abbreviation belong to the common practise of the industry, can search on the net, do not describe one by one here.
Claims (9)
1. an oil well micro emulsion fracturing liquid, is characterized in that: described fracturing liquid is formed by composite by the base fluid of 65 ~ 99.99 parts and the crosslinked fluid of 0.01 ~ 35.0 part; Described base fluid is made up of the water of 95 ~ 99.5 parts, the viscosifying agent of 0.1 ~ 1.0 part, the micro emulsion additive of 0.1 ~ 1.0 part, the clay stabilizer of 0.1 ~ 1.0 part, the pH value regulator of 0.1 ~ 1.0 part, the sterilant of 0.1 ~ 1.0 part, and above-mentioned number is mass parts.
2. a kind of oil well micro emulsion fracturing liquid according to claim 1, is characterized in that: described crosslinked fluid comprises water and 0.1 ~ 100.0 part of linking agent of 0 ~ 99.9 part.
3. a kind of oil well micro emulsion fracturing liquid according to claim 1, is characterized in that: described viscosifying agent is hydroxypropylguar gum CJ2-6; Described clay stabilizer is clay stabilizer COP-1; Described pH value regulator is conditioning agent CJ-3; Described sterilant is sterilant CJSJ-2.
4. a kind of oil well micro emulsion fracturing liquid according to claim 1, is characterized in that: described micro emulsion additive mixes gained emulsion by positive structure 12 carbon alkane, n-hexyl alcohol, sodium-chlor, emulsifier op-10 by the weight ratio of 5: 5:0.4:0.002.
5. a kind of oil well micro emulsion fracturing liquid according to claim 2, is characterized in that: described crosslinked fluid can also comprise the gel breaker that mass parts is 0.001 ~ 0.5 part.
6. a kind of oil well micro emulsion fracturing liquid according to claim 2, is characterized in that: described linking agent is the organic or inorganic compound of borax, Sodium Tetraborate, triethanolamine borate and boron.
7. a kind of oil well micro emulsion fracturing liquid according to claim 5, is characterized in that: described gel breaker is ammonium persulphate, Potassium Persulphate, hydrogen peroxide, benzoyl peroxide, cellulase or glycanase.
8. a kind of oil well micro emulsion fracturing liquid according to claim 1, it is characterized in that: the compound method of described base fluid is: when stirring with pump circulation or agitator, the viscosifying agent of formula ratio is slowly added in the water of formula ratio, continue circulation or stir 10 minutes, liquid is fully mixed, then adds micro emulsion additive, sterilant, clay stabilizer, the pH value regulator of formula ratio successively, continue circulation 20min, make viscosifying agent fully swelling, form uniform liquid.
9. a kind of oil well micro emulsion fracturing liquid according to claim 1, is characterized in that: described fracturing liquid is applicable to use at the oil well of well temperature within 100 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310411487.8A CN104419398A (en) | 2013-09-11 | 2013-09-11 | Micro-emulsion fracturing fluid for oil well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310411487.8A CN104419398A (en) | 2013-09-11 | 2013-09-11 | Micro-emulsion fracturing fluid for oil well |
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| CN104419398A true CN104419398A (en) | 2015-03-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728076A (en) * | 2018-05-29 | 2018-11-02 | 北京大德广源石油技术服务有限公司 | Micro-emulsion nano fracturing yield increasing agent and preparation method thereof |
| WO2019079250A1 (en) * | 2017-10-16 | 2019-04-25 | Saudi Arabian Oil Company | Fracturing fluids comprising alkanolamine borates as crosslinkers for polysaccharides |
| CN113563861A (en) * | 2021-07-27 | 2021-10-29 | 中国石油大学(北京) | Microemulsion composition, nano emulsion, preparation method and application of nano emulsion, and fracturing fluid |
-
2013
- 2013-09-11 CN CN201310411487.8A patent/CN104419398A/en active Pending
Non-Patent Citations (1)
| Title |
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| 刘佳林: "环保型微乳液改善压裂增产效果研究", 《中国优秀硕士学位论文全文数据库（电子期刊）》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019079250A1 (en) * | 2017-10-16 | 2019-04-25 | Saudi Arabian Oil Company | Fracturing fluids comprising alkanolamine borates as crosslinkers for polysaccharides |
| US10544347B2 (en) | 2017-10-16 | 2020-01-28 | Saudi Arabian Oil Company | Fracturing fluids comprising alkanolamine borates as crosslinkers for polysaccharides |
| CN111479901A (en) * | 2017-10-16 | 2020-07-31 | 沙特阿拉伯石油公司 | Fracturing fluid containing alkanolamine borate as cross-linking agent for polysaccharides |
| CN108728076A (en) * | 2018-05-29 | 2018-11-02 | 北京大德广源石油技术服务有限公司 | Micro-emulsion nano fracturing yield increasing agent and preparation method thereof |
| CN108728076B (en) * | 2018-05-29 | 2019-10-08 | 北京大德广源石油技术服务有限公司 | Micro-emulsion nano fracturing yield increasing agent and preparation method thereof |
| CN113563861A (en) * | 2021-07-27 | 2021-10-29 | 中国石油大学(北京) | Microemulsion composition, nano emulsion, preparation method and application of nano emulsion, and fracturing fluid |
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