CN104194766A - Clean fracturing fluid and preparation method thereof - Google Patents
Clean fracturing fluid and preparation method thereof Download PDFInfo
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- CN104194766A CN104194766A CN201410465894.1A CN201410465894A CN104194766A CN 104194766 A CN104194766 A CN 104194766A CN 201410465894 A CN201410465894 A CN 201410465894A CN 104194766 A CN104194766 A CN 104194766A
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- 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
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
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- 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
- C09K8/665—Compositions based on water or polar solvents containing inorganic compounds
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- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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Abstract
The invention discloses a clean fracturing fluid which comprises crude rubber fluid, viscosity accelerant and gel breaker, the crude rubber fluid comprises the following materials by mass percent: 0.1%-0.5% of hydrophobic association polyacrylamide, 0.05%-0.2% of organic acid, 0.1%-0.8% of clay stabilizer and the balance of water; the viscosity accelerant comprises the following materials according to mass percent: 0.05%-0.4% of alkyl amine oxide, 0.1%-0.5% of Gemini surfactant, 0.1%-1.0% of alkyl lower alcohol, 0.05%-0.4% of pH regulator, and the balance of water; the volume ratio of the crude rubber fluid to the viscosity accelerant is 100:(5-10), and the mass of the gel breaker is 0.005%-0.05% that of the clean fracturing fluid. The invention further provides a preparation method of the clean fracturing fluid. The long-term technical problems of high cost and poor temperature resistance performance of the clean fracturing fluid are solved.
Description
Technical field
The invention belongs to petrochemical technology field, be specifically related to a kind of clean fracturing fluid and preparation method thereof.
Background technology
Pressure break is a kind of major measure of well production increment, intensified injection of wells.Fracturing liquid is divided into aqueous fracturing fluid, oil base fracturing fluid, bubble end fracturing liquid and clean fracturing fluid etc.Water base guar gum fracturing fluid is the on-the-spot main fracturing working fluid using of hypotonic and special low-permeability oilfield.Fracturing effect statistics shows: this fracturing liquid exists that additive types is many, breaking glue solution residue greatly, after pressure break the stable yields cycle short, the shortcomings such as the poor and dosing complex process of fracturing effect.
VES cats product type clean fracturing fluid is a kind of fracturing fluid system of non-polymer, have advantages of without residue, anti-clayswelling effective, it has overcome the shortcoming of guar gum fracturing fluid, be a revolutionary change of guar gum fracturing fluid technology, be considered to the highest level of aqueous fracturing fluid technology.But its shortcoming is cation-adsorption and cost high (dosage 1.5%～6%), temperature resistant capability low (≤70 DEG C), causes this fracturing liquid applying with scale to be at the scene restricted.
The fracturing liquid of patent ZL201110374771.3 report is a kind of non-cationic surfactant type fracturing liquid.This fracturing liquid has overcome the cationic fracturing liquid of VES and has adsorbed the injury causing, and gives brokenly glue displacement of reservoir oil effect simultaneously, is a kind of fracturing fluid system of composite highly effective, but its shortcoming is that (1) additive dosage is large, and cost is high; (2) fracturing liquid temperature tolerance poor (≤80 DEG C), therefore, this fracturing liquid can not meet on-the-spot pressing crack construction completely to fracturing liquid performance requriements.
The sub-a kind of association type hydrophobic group polymer fracturing fluid of having reported for work that waits in Luoping is a kind of cross-linking type fracturing fluid system forming by acrylamide being carried out to modification.This of the fracturing fluid great advantage is that residue is low, and anti-shear performance is good, and heat resistance is significantly improved (120 DEG C following), but when shortcoming is (1) on-the-spot dosing, solid powdery thickening material dissolves slowly and is prone to " flake " in water; (2) when thickening material dosage increases to after 0.4%, original gelatin viscosity is greater than 90mPas, pump liquid difficulty when site operation; (3) dosage is large, and cost is high.Above-mentioned deficiency has limited it and has used on a large scale.
Make a general survey of domestic and international fracturing liquid development, low cost, low injury, high temperature resistant and compound fracturing liquid remain the developing direction of fracturing working fluid from now on.
Summary of the invention
Technical problem to be solved by this invention is, for above-mentioned the deficiencies in the prior art, to provide a kind of clean fracturing fluid.This clean fracturing fluid passes through rational proportion, not only avoid polymer fracturing fluid and the surfactant fracturing fluid defect of performance separately, take into account the combination of sciences that advantage separately has realized polymer fracturing fluid and surfactant fracturing fluid simultaneously, fracturing liquid performance is significantly improved.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of clean fracturing fluid, it is characterized in that, formed by original gelatin, viscosity promotor and gel breaker, described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.1%～0.5%, organic acid 0.05%～0.2%, clay stabilizer 0.1%～0.8%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: alkyl amine oxide 0.05%～0.4%, and Gemini tensio-active agent 0.1%～0.5%, alkyl low-carbon alcohol 0.1%～1.0%, pH adjusting agent 0.05%～0.4%, surplus is water; The volume ratio of described original gelatin and viscosity promotor is 100:(5～10), the quality of gel breaker is 0.005%～0.05% of clean fracturing fluid quality; Described organic acid is one or more in mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, oxalic acid and thionamic acid, and clay stabilizer is NH
4cl or KCl; Described alkyl low-carbon alcohol is methyl alcohol, butanols or amylalcohol, and pH adjusting agent is trolamine, diethanolamine, thanomin, NaOH, KOH, K
2cO
3, Na
2cO
3or NaHCO
3; Described gel breaker is ammonium persulphate or dioxide peroxide.
Above-mentioned a kind of clean fracturing fluid, is characterized in that, described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.1%～0.3%, and organic acid 0.05%～0.1%, clay stabilizer 0.2%～0.6%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: alkyl amine oxide 0.1%～0.3%, and Gemini tensio-active agent 0.2%～0.4%, alkyl low-carbon alcohol 0.3%～0.8%, pH adjusting agent 0.1%～0.3%, surplus is water; The quality of described gel breaker is 0.03%～0.05% of clean fracturing fluid quality.
Above-mentioned a kind of clean fracturing fluid, is characterized in that, described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.2%, and organic acid 0.08%, clay stabilizer 0.5%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: alkyl amine oxide 0.15%, and Gemini tensio-active agent 0.3%, alkyl low-carbon alcohol 0.5%, pH adjusting agent 0.15%, surplus is water; The quality of described gel breaker is 0.04% of clean fracturing fluid quality.
Above-mentioned a kind of clean fracturing fluid, it is characterized in that, described hydrophobic association polyacrylamide is FRAC-102 associated complex viscosifying agent (oilfield technology company limited of Xi'an Cali), FRA-313 associated complex viscosifying agent (Beijing furyk technical development company), GRF-1 association type non-crosslinked fracturing fluid thickener (Sichuan Guangya Polymer Chemical Co., Ltd.), CGR-7 associated complex viscosifying agent (Chengdu Jian Xiang Shu Guan Science and Technology Ltd.) or SXT102 viscosifying agent (Beijing Xitao Development Tech Co., Ltd.) for pressure break.
Above-mentioned a kind of clean fracturing fluid, it is characterized in that, described alkyl amine oxide is octadecyl dihydroxy ethyl amine oxide, hexadecyl dihydroxy ethyl amine oxide, cetyl dimethyl amine oxide, octadecyl dimethyl amine oxide or stearylamide propyl group amine oxide.
In addition, the present invention also provides a kind of method of preparing above-mentioned clean fracturing fluid, it is characterized in that, the method comprises the following steps:
Step 1, hydrophobic association polyacrylamide, clay stabilizer, organic acid and water are mixed, obtain original gelatin;
Step 2, alkyl amine oxide, Gemini tensio-active agent, alkyl low-carbon alcohol and pH adjusting agent are mixed, obtain viscosity promotor;
Step 3, by viscosity promotor described in original gelatin described in step 1 and step 2 mix after stir 1min～5min, when construction to stir after mixture in add gel breaker, mix, obtain clean fracturing fluid.
Clean fracturing fluid of the present invention carries propping agent according to ordinary method while use and pumps in oil well.
The present invention compared with prior art has the following advantages:
1, clean fracturing fluid production cost of the present invention low, injure little, excellent performance, solved polymer fracturing fluid high temperature dosage large, the difficult and poor problem of result of use of on-the-spot dosing; Improve surfactant type fracturing liquid temperature resistant capability, reduced dosage, reduced fracturing liquid cost, solved the technical barriers such as clean fracturing fluid cost is high for a long time, heat resistance is poor.
2, the organic acid in clean fracturing fluid of the present invention can ensure that hydrophobic association polyacrylamide is in the time that high density is used, original gelatin viscosity remains on below 60mPas, so that the pumpability of on-the-spot pressing crack construction original gelatin, solve the conveying difficult problem that hydrophobic associated polymer fracturing liquid produces because original gelatin viscosity is excessive in the time that high density is used and affected fracturing liquid quality problems; In addition, organic acid is combined the salt of rear generation and has been improved greatly of the fracturing fluid heat-resisting property with pH adjusting agent, also can and hydrophobic association polyacrylamide between produce synergy, improve of the fracturing fluid viscosity.
3, the organic acid in clean fracturing fluid of the present invention has very strong complexing action to calcium ion in water, has alleviated the problem of hydrophobic association polyacrylamide chance calcium ion degradation.
4, the pH adjusting agent in clean fracturing fluid of the present invention has not only neutralized organic acid, has ensured fracturing liquid (pH=8～9) plastic under alkaline environment simultaneously, has improved of the fracturing fluid viscosity.
5, between the Gemini tensio-active agent in clean fracturing fluid of the present invention and hydrophobic association polyacrylamide, produce synergy, not only reduced the working concentration of polymkeric substance and tensio-active agent, and of the fracturing fluid temperature tolerance and viscosity are significantly improved.
6, clean fracturing fluid of the present invention relies on the degraded of oxidized form gel breaker to have the hydrophobic association polyacrylamide of certain viscosity, and the micellar structure of utilizing crude oil failure surface promoting agent and hydrophobic association polyacrylamide to form, finally realizes thoroughly broken glue of fracturing liquid.
7, the alkyl low-carbon alcohol in clean fracturing fluid of the present invention, except increasing Gemini surfactant dissolves dispersiveness, also has froth breaking effect concurrently simultaneously.
8, clean fracturing fluid of the present invention passes through rational proportion, not only avoid polymer fracturing fluid and the surfactant fracturing fluid defect of performance separately, take into account the combination of sciences that advantage separately has realized polymer fracturing fluid and surfactant fracturing fluid simultaneously, fracturing liquid performance is significantly improved.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail.
Brief description of the drawings
Fig. 1 is the shearing curve figure of the clean fracturing fluid of the embodiment of the present invention 1.
Fig. 2 is the shearing curve figure of the clean fracturing fluid of the embodiment of the present invention 3.
Fig. 3 is the shearing curve figure of the clean fracturing fluid of the embodiment of the present invention 5.
Embodiment
Embodiment 1
The clean fracturing fluid of the present embodiment, is made up of original gelatin, viscosity promotor and gel breaker, and described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.2%, and organic acid 0.08%, clay stabilizer 0.5%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: hexadecyl dihydroxy ethyl amine oxide 0.15%, Gemini tensio-active agent (Sulfonic Gemini Surfactants) 0.3%, alkyl low-carbon alcohol 0.5%, pH adjusting agent 0.15%, surplus is water; The volume ratio of described original gelatin and viscosity promotor is 100:8, and the quality of gel breaker is 0.04% of clean fracturing fluid quality; Described hydrophobic association polyacrylamide is FRAC-102 associated complex viscosifying agent (purchased from oilfield technology company limited of Xi'an Cali); Described organic acid is mahogany acid, and described clay stabilizer is NH
4cl, described alkyl low-carbon alcohol is methyl alcohol, and described pH adjusting agent is trolamine, and described gel breaker is ammonium persulphate.
The preparation method of the clean fracturing fluid of the present embodiment is:
Step 1, by FRAC-102 associated complex viscosifying agent, clay stabilizer NH
4cl, organic acid mahogany acid and water mix, and obtain original gelatin;
Step 2, hexadecyl dihydroxy ethyl amine oxide, Gemini tensio-active agent, methyl alcohol and trolamine are mixed, obtain viscosity promotor;
Step 3, by viscosity promotor described in original gelatin described in step 1 and step 2 mix after stir 5min, when construction to stir after mixture in add gel breaker, mix, obtain clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method while use and pumps in oil well.
Fig. 1 is the shearing curve figure of the clean fracturing fluid of the present embodiment.As can be seen from the figure, the clean fracturing fluid of the present embodiment is at 120 DEG C, 170s
-1viscosity>=40mPas after the lower 80min of shearing continuously.
Embodiment 2
The present embodiment is identical with embodiment 1, and wherein difference is: described hydrophobic association polyacrylamide is FRA-313 associated complex viscosifying agent (Beijing furyk technical development company), GRF-1 association type non-crosslinked fracturing fluid thickener (Sichuan Guangya Polymer Chemical Co., Ltd.), CGR-7 associated complex viscosifying agent (Chengdu Jian Xiang Shu Guan Science and Technology Ltd.) or SXT102 viscosifying agent (Beijing Xitao Development Tech Co., Ltd.) for pressure break, described alkyl amine oxide is octadecyl dihydroxy ethyl amine oxide, cetyl dimethyl amine oxide, octadecyl dimethyl amine oxide or stearylamide propyl group amine oxide, described organic acid is fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, oxalic acid or thionamic acid, or be mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, in oxalic acid and thionamic acid at least two kinds, described alkyl low-carbon alcohol is butanols or amylalcohol, and described clay stabilizer is KCl, and described pH adjusting agent is diethanolamine, thanomin, ammoniacal liquor, NaOH, KOH, K
2cO
3, Na
2cO
3or NaHCO
3, described gel breaker is dioxide peroxide.
Embodiment 3
The clean fracturing fluid of the present embodiment, is made up of original gelatin, viscosity promotor and gel breaker, and described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.3%, and organic acid 0.1%, clay stabilizer 0.6%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: cetyl dimethyl amine oxide 0.1%, Gemini tensio-active agent (Quaternary Ammonium Gemini Surfactants) 0.2%, alkyl low-carbon alcohol 0.8%, pH adjusting agent 0.3%, surplus is water; The volume ratio of described original gelatin and viscosity promotor is 100:5, and the quality of gel breaker is 0.03% of clean fracturing fluid quality; Described hydrophobic association polyacrylamide is GRF-1 association type non-crosslinked fracturing fluid thickener (purchased from Sichuan Guangya Polymer Chemical Co., Ltd.); Described organic acid is the mixture (mass ratio of mahogany acid and fatty alcohol sulphuric acid is 1:1) of mahogany acid and fatty alcohol sulphuric acid, described alkyl low-carbon alcohol is amylalcohol, described clay stabilizer is KCl, and described pH adjusting agent is NaOH, and described gel breaker is dioxide peroxide.
The preparation method of the clean fracturing fluid of the present embodiment is:
Step 1, GRF-1 association type non-crosslinked fracturing fluid thickener, clay stabilizer KCl, mahogany acid, fatty alcohol sulphuric acid and water are mixed, obtain original gelatin;
Step 2, cetyl dimethyl amine oxide, Gemini tensio-active agent, amylalcohol and NaOH are mixed, obtain viscosity promotor;
Step 3, by viscosity promotor described in original gelatin described in step 1 and step 2 mix after stir 3min, when construction to stir after mixture in add gel breaker, mix, obtain clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method while use and pumps in oil well.
Fig. 2 is the shearing curve figure of the clean fracturing fluid of the present embodiment.As can be seen from the figure, the clean fracturing fluid of the present embodiment is at 110 DEG C, 170s
-1viscosity>=40mPas after the lower 80min of shearing continuously.
Embodiment 4
The present embodiment is identical with embodiment 3, and wherein difference is: described hydrophobic association polyacrylamide is FRAC-102 associated complex viscosifying agent (oilfield technology company limited of Xi'an Cali), FRA-313 associated complex viscosifying agent (Beijing furyk technical development company), CGR-7 associated complex viscosifying agent (Chengdu Jian Xiang Shu Guan Science and Technology Ltd.) or SXT102 viscosifying agent (Beijing Xitao Development Tech Co., Ltd.) for pressure break, described alkyl amine oxide is octadecyl dihydroxy ethyl amine oxide, hexadecyl dihydroxy ethyl amine oxide, octadecyl dimethyl amine oxide or stearylamide propyl group amine oxide, described organic acid is mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, a kind of in oxalic acid and thionamic acid or more than three kinds, or be fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, in oxalic acid and thionamic acid two kinds, or be ethylenediamine tetraacetic acid (EDTA), citric acid, one in oxalic acid and thionamic acid and mahogany acid, described alkyl low-carbon alcohol is methyl alcohol or butanols, described clay stabilizer is NH
4cl, described pH adjusting agent is trolamine, diethanolamine, thanomin, ammoniacal liquor, KOH, K
2cO
3, Na
2cO
3or NaHCO
3, described gel breaker is ammonium persulphate.
Embodiment 5
The clean fracturing fluid of the present embodiment, is made up of original gelatin, viscosity promotor and gel breaker, and described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.1%, and organic acid 0.05%, clay stabilizer 0.2%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: octadecyl dihydroxy ethyl amine oxide 0.3%, Gemini tensio-active agent (polyethylene nonionic Gemini tensio-active agent) 0.4%, alkyl low-carbon alcohol 0.3%, pH adjusting agent 0.1%, surplus is water; The volume ratio of described original gelatin and viscosity promotor is 100:10, and the quality of gel breaker is 0.05% of clean fracturing fluid quality; Described hydrophobic association polyacrylamide is FRA-313 associated complex viscosifying agent (purchased from Beijing furyk technical development company); Described organic acid is the mixture (mass ratio of mahogany acid and citric acid is 2:1) of mahogany acid and citric acid, described alkyl low-carbon alcohol is butanols, described clay stabilizer is KCl, and described pH adjusting agent is thanomin, and described gel breaker is ammonium persulphate.
The preparation method of the clean fracturing fluid of the present embodiment is:
Step 1, FRA-313 associated complex viscosifying agent, clay stabilizer KCl, mahogany acid, fatty alcohol sulphuric acid, citric acid and water are mixed, obtain original gelatin;
Step 2, octadecyl dihydroxy ethyl amine oxide, Gemini tensio-active agent, butanols and thanomin are mixed, obtain viscosity promotor;
Step 3, by viscosity promotor described in original gelatin described in step 1 and step 2 mix after stir 1min, when construction to stir after mixture in add gel breaker, mix, obtain clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method while use and pumps in oil well.
Fig. 3 is the shearing curve figure of the clean fracturing fluid of the present embodiment.As can be seen from the figure, the clean fracturing fluid of the present embodiment is at 100 DEG C, 170s
-1viscosity>=40mPas after the lower 80min of shearing continuously.
Embodiment 6
The present embodiment is identical with embodiment 5, and wherein difference is: described hydrophobic association polyacrylamide is FRAC-102 associated complex viscosifying agent (oilfield technology company limited of Xi'an Cali), GRF-1 association type non-crosslinked fracturing fluid thickener (Sichuan Guangya Polymer Chemical Co., Ltd.), CGR-7 associated complex viscosifying agent (Chengdu Jian Xiang Shu Guan Science and Technology Ltd.) or SXT102 viscosifying agent (Beijing Xitao Development Tech Co., Ltd.) for pressure break, described alkyl amine oxide is hexadecyl dihydroxy ethyl amine oxide, cetyl dimethyl amine oxide, octadecyl dimethyl amine oxide or stearylamide propyl group amine oxide, described organic acid is mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, a kind of in oxalic acid and thionamic acid or more than three kinds, or be fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, in oxalic acid and thionamic acid two kinds, or be fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), the mixture of a kind of and mahogany acid in oxalic acid and thionamic acid, described alkyl low-carbon alcohol is methyl alcohol or amylalcohol, described clay stabilizer is NH
4cl, described pH adjusting agent is trolamine, diethanolamine, ammoniacal liquor, NaOH, KOH, K
2cO
3, Na
2cO
3or NaHCO
3, described gel breaker is dioxide peroxide.
Embodiment 7
The clean fracturing fluid of the present embodiment, is made up of original gelatin, viscosity promotor and gel breaker, and described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.2%, and organic acid 0.08%, clay stabilizer 0.5%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: octadecyl dimethyl amine oxide 0.15%, Gemini tensio-active agent (Quaternary Ammonium Gemini Surfactants) 0.3%, alkyl low-carbon alcohol 0.5%, pH adjusting agent 0.15%, surplus is water; The volume ratio of described original gelatin and viscosity promotor is 100:10, and the quality of gel breaker is 0.05% of clean fracturing fluid quality; Described hydrophobic association polyacrylamide is FRA-313 associated complex viscosifying agent (purchased from Beijing furyk technical development company); Described organic acid is the mixture (mass ratio of oxalic acid and thionamic acid is 3:1) of oxalic acid and thionamic acid, and described alkyl low-carbon alcohol is methyl alcohol, and described clay stabilizer is NH
4cl, described pH adjusting agent is NaHCO
3, described gel breaker is dioxide peroxide.
The preparation method of the clean fracturing fluid of the present embodiment is:
Step 1, by FRA-313 associated complex viscosifying agent, clay stabilizer NH
4cl, oxalic acid, thionamic acid and water mix, and obtain original gelatin;
Step 2, by octadecyl dimethyl amine oxide, Gemini tensio-active agent, methyl alcohol and NaHCO
3mix, obtain viscosity promotor;
Step 3, by viscosity promotor described in original gelatin described in step 1 and step 2 mix after stir 1min, when construction to stir after mixture in add gel breaker, mix, obtain clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method while use and pumps in oil well.
Embodiment 8
The present embodiment is identical with embodiment 7, and wherein difference is: described hydrophobic association polyacrylamide is FRAC-102 associated complex viscosifying agent (oilfield technology company limited of Xi'an Cali), GRF-1 association type non-crosslinked fracturing fluid thickener (Sichuan Guangya Polymer Chemical Co., Ltd.), CGR-7 associated complex viscosifying agent (Chengdu Jian Xiang Shu Guan Science and Technology Ltd.) or SXT102 viscosifying agent (Beijing Xitao Development Tech Co., Ltd.) for pressure break, described alkyl amine oxide is octadecyl dihydroxy ethyl amine oxide, hexadecyl dihydroxy ethyl amine oxide, cetyl dimethyl amine oxide or stearylamide propyl group amine oxide, described organic acid is mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, a kind of in oxalic acid and thionamic acid or more than three kinds, or be mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), in citric acid and oxalic acid two kinds, or be mahogany acid, fatty alcohol sulphuric acid, the mixture of a kind of and thionamic acid in ethylenediamine tetraacetic acid (EDTA) and citric acid, described alkyl low-carbon alcohol is butanols or amylalcohol, and described clay stabilizer is KCl, and described pH adjusting agent is trolamine, diethanolamine, thanomin, ammoniacal liquor, NaOH, KOH, K
2cO
3or Na
2cO
3, described gel breaker is ammonium persulphate.
Embodiment 9
The clean fracturing fluid of the present embodiment, is made up of original gelatin, viscosity promotor and gel breaker, and described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.1%, and organic acid 0.05%, clay stabilizer 0.1%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: stearylamide propyl group amine oxide 0.05%, Gemini tensio-active agent (carboxylic acid type Gemini tensio-active agent) 0.5%, alkyl low-carbon alcohol 0.1%, pH adjusting agent 0.05%, surplus is water; The volume ratio of described original gelatin and viscosity promotor is 100:5, and the quality of gel breaker is 0.005% of clean fracturing fluid quality; Described hydrophobic association polyacrylamide is SXT102 viscosifying agent (purchased from Beijing Xitao Development Tech Co., Ltd.) for pressure break; Described organic acid is ethylenediamine tetraacetic acid (EDTA), and described alkyl low-carbon alcohol is amylalcohol, and described clay stabilizer is KCl, and described pH adjusting agent is K
2cO
3, described gel breaker is ammonium persulphate.
The preparation method of the clean fracturing fluid of the present embodiment is:
Step 1, by SXT102 for pressure break viscosifying agent, clay stabilizer KCl, ethylenediamine tetraacetic acid (EDTA) and water mix, obtain original gelatin;
Step 2, by stearylamide propyl group amine oxide, Gemini tensio-active agent, amylalcohol and K
2cO
3mix, obtain viscosity promotor;
Step 3, by viscosity promotor described in original gelatin described in step 1 and step 2 mix after stir 3min, when construction to stir after mixture in add gel breaker, mix, obtain clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method while use and pumps in oil well.
Embodiment 10
The present embodiment is identical with embodiment 9, wherein difference is: described hydrophobic association polyacrylamide is FRAC-102 associated complex viscosifying agent (oilfield technology company limited of Xi'an Cali), FRA-313 associated complex viscosifying agent (Beijing furyk technical development company), GRF-1 association type non-crosslinked fracturing fluid thickener (Sichuan Guangya Polymer Chemical Co., Ltd.) or CGR-7 associated complex viscosifying agent (Chengdu Jian Xiang Shu Guan Science and Technology Ltd.), described alkyl amine oxide is octadecyl dihydroxy ethyl amine oxide, hexadecyl dihydroxy ethyl amine oxide, cetyl dimethyl amine oxide or octadecyl dimethyl amine oxide, described organic acid is mahogany acid, fatty alcohol sulphuric acid, citric acid, oxalic acid or thionamic acid, or be mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, in oxalic acid and thionamic acid at least two kinds, described alkyl low-carbon alcohol is methyl alcohol or butanols, described clay stabilizer is NH
4cl, described pH adjusting agent is trolamine, diethanolamine, thanomin, ammoniacal liquor, NaOH, KOH, Na
2cO
3or NaHCO
3, described gel breaker is dioxide peroxide.
Embodiment 11
The clean fracturing fluid of the present embodiment, is made up of original gelatin, viscosity promotor and gel breaker, and described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.5%, and organic acid 0.2%, clay stabilizer 0.8%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: cetyl dimethyl amine oxide 0.4%, Gemini tensio-active agent (Quaternary Ammonium Gemini Surfactants) 0.1%, alkyl low-carbon alcohol 1.0%, pH adjusting agent 0.4%, surplus is water; The volume ratio of described original gelatin and viscosity promotor is 100:7, and the quality of gel breaker is 0.01% of clean fracturing fluid quality; Described hydrophobic association polyacrylamide is CGR-7 associated complex viscosifying agent (purchased from Chengdu Jian Xiang Shu Guan Science and Technology Ltd.); Described organic acid is the mixture (mass ratio of mahogany acid and ethylenediamine tetraacetic acid (EDTA) is 1:3) of mahogany acid and ethylenediamine tetraacetic acid (EDTA), and described alkyl low-carbon alcohol is butanols, and described clay stabilizer is NH
4cl, described pH adjusting agent is KOH, described gel breaker is ammonium persulphate.
The preparation method of the clean fracturing fluid of the present embodiment is:
Step 1, by CGR-7 associated complex viscosifying agent, clay stabilizer NH
4cl, mahogany acid, oxalic acid, thionamic acid and water mix, and obtain original gelatin;
Step 2, cetyl dimethyl amine oxide, Gemini tensio-active agent, butanols and KOH are mixed, obtain viscosity promotor;
Step 3, by viscosity promotor described in original gelatin described in step 1 and step 2 mix after stir 3min, when construction to stir after mixture in add gel breaker, mix, obtain clean fracturing fluid.
The clean fracturing fluid of the present embodiment carries propping agent according to ordinary method while use and pumps in oil well.
Embodiment 12
The present embodiment is identical with embodiment 11, and wherein difference is: described hydrophobic association polyacrylamide is FRAC-102 associated complex viscosifying agent (oilfield technology company limited of Xi'an Cali), FRA-313 associated complex viscosifying agent (Beijing furyk technical development company), GRF-1 association type non-crosslinked fracturing fluid thickener (Sichuan Guangya Polymer Chemical Co., Ltd.) or SXT102 be viscosifying agent (Beijing Xitao Development Tech Co., Ltd.) for pressure break, and described alkyl amine oxide is octadecyl dihydroxy ethyl amine oxide, hexadecyl dihydroxy ethyl amine oxide, cetyl dimethyl amine oxide, octadecyl dimethyl amine oxide or stearylamide propyl group amine oxide, described organic acid is mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, a kind of in oxalic acid and thionamic acid or more than three kinds, or be fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, in oxalic acid and thionamic acid two kinds, or be fatty alcohol sulphuric acid, citric acid, the mixture of a kind of and mahogany acid in oxalic acid and thionamic acid, described alkyl low-carbon alcohol is methyl alcohol or amylalcohol, and described clay stabilizer is KCl, and described pH adjusting agent is trolamine, diethanolamine, thanomin, ammoniacal liquor, NaOH, K
2cO
3, Na
2cO
3or NaHCO
3, described gel breaker is dioxide peroxide.
The performance comparison of fracturing liquid of the present invention and VES fracturing liquid and polymer fracturing fluid:
Table 1 three types fracturing liquid performance comparison
As can be seen from Table 1, clean fracturing fluid of the present invention is a kind of a kind of fracturing fluid system between VES clean fracturing fluid and polymer fracturing fluid.It has inherited two kinds of fracturing liquid advantages, avoids its shortcoming, has good performance.
Clean fracturing fluid of the present invention, at the broken glue of different time, almost without residue, is detected the viscosity after broken glue after broken glue, the results are shown in following table.
Viscosity measurements result after the broken glue of table 2 different time
As can be seen from Table 2,80～100 DEG C of temperature, can make fracturing liquid completely broken glue in 4.0h when fracturing liquid rubber-breaking agent concentration is 0.03%～0.05%, after broken glue, soltion viscosity is very low, and the viscosity after broken glue is less than 3.2mPas, and surface tension is less than 28mN/m.
The residue contrast of table 3 clean fracturing fluid of the present invention and conventional guanidine gum fracturing fluid
| Fracturing liquid | Residue content ppm | Phenomenon |
| Guanidine gum fracturing fluid | 350 | Breaking glue solution has floss |
| Clean fracturing fluid of the present invention | Almost without residue | Limpid bright |
As can be seen from Table 3, clean fracturing fluid of the present invention is almost without residue, limpid bright, belongs to clean fracturing liquid.
Adopt diameter 3.8cm, the artificial cores of length 7.6cm carries out dynamically injury test, and clean fracturing fluid more of the present invention and the injury of conventional guanidine gum fracturing fluid to rock core, the results are shown in Table 4.
The comparison to core damage of table 4 clean fracturing fluid of the present invention and conventional guanidine gum fracturing fluid
As can be seen from Table 3, fracturing liquid of the present invention is almost without residue, limpid bright, belongs to clean fracturing liquid.As can be seen from Table 4, use diameter 3.8cm, the dynamic injury that the artificial cores of length 7.6cm carries out is tested and is shown, clean fracturing fluid of the present invention is less to the permeability damage rate of rock core matrix, and its on average injury rate is 5.08%.And the permeability damage rate that under equal conditions records guanidine gum fracturing fluid reaches 28.30%.Visible, clean fracturing fluid of the present invention can significantly reduce the injury to rock core.
The above; it is only preferred embodiment of the present invention; not the present invention is done to any restriction, every any simple modification of above embodiment being done according to invention technical spirit, change and equivalent structure change, and all still belong in the protection domain of technical solution of the present invention.
Claims (6)
1. a clean fracturing fluid, it is characterized in that, formed by original gelatin, viscosity promotor and gel breaker, described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.1%～0.5%, organic acid 0.05%～0.2%, clay stabilizer 0.1%～0.8%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: alkyl amine oxide 0.05%～0.4%, and Gemini tensio-active agent 0.1%～0.5%, alkyl low-carbon alcohol 0.1%～1.0%, pH adjusting agent 0.05%～0.4%, surplus is water; The volume ratio of described original gelatin and viscosity promotor is 100:(5～10), the quality of gel breaker is 0.005%～0.05% of clean fracturing fluid quality; Described organic acid is one or more in mahogany acid, fatty alcohol sulphuric acid, ethylenediamine tetraacetic acid (EDTA), citric acid, oxalic acid and thionamic acid, and clay stabilizer is NH
4cl or KCl; Described alkyl low-carbon alcohol is methyl alcohol, butanols or amylalcohol, and pH adjusting agent is trolamine, diethanolamine, thanomin, NaOH, KOH, K
2cO
3, Na
2cO
3or NaHCO
3; Described gel breaker is ammonium persulphate or dioxide peroxide.
2. a kind of clean fracturing fluid according to claim 1, it is characterized in that, described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.1%～0.3%, organic acid 0.05%～0.1%, clay stabilizer 0.2%～0.6%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: alkyl amine oxide 0.1%～0.3%, and Gemini tensio-active agent 0.2%～0.4%, alkyl low-carbon alcohol 0.3%～0.8%, pH adjusting agent 0.1%～0.3%, surplus is water; The quality of described gel breaker is 0.03%～0.05% of clean fracturing fluid quality.
3. a kind of clean fracturing fluid according to claim 2, is characterized in that, described original gelatin is made up of the raw material of following mass percent: hydrophobic association polyacrylamide 0.2%, and organic acid 0.08%, clay stabilizer 0.5%, surplus is water; Described viscosity promotor is made up of the raw material of following mass percent: alkyl amine oxide 0.15%, and Gemini tensio-active agent 0.3%, alkyl low-carbon alcohol 0.5%, pH adjusting agent 0.15%, surplus is water; The quality of described gel breaker is 0.04% of clean fracturing fluid quality.
4. according to a kind of clean fracturing fluid described in claim 1,2 or 3, it is characterized in that, described hydrophobic association polyacrylamide is FRAC-102 associated complex viscosifying agent, FRA-313 associated complex viscosifying agent, GRF-1 association type non-crosslinked fracturing fluid thickener, CGR-7 associated complex viscosifying agent or SXT102 pressure break viscosifying agent.
5. according to a kind of clean fracturing fluid described in claim 1,2 or 3, it is characterized in that, described alkyl amine oxide is octadecyl dihydroxy ethyl amine oxide, hexadecyl dihydroxy ethyl amine oxide, cetyl dimethyl amine oxide, octadecyl dimethyl amine oxide or stearylamide propyl group amine oxide.
6. a method of preparing clean fracturing fluid as described in claim 1,2 or 3, is characterized in that, the method comprises the following steps:
Step 1, hydrophobic association polyacrylamide, clay stabilizer, organic acid and water are mixed, obtain original gelatin;
Step 2, alkyl amine oxide, Gemini tensio-active agent, alkyl low-carbon alcohol and pH adjusting agent are mixed, obtain viscosity promotor;
Step 3, by viscosity promotor described in original gelatin described in step 1 and step 2 mix after stir 1min～5min, when construction to stir after mixture in add gel breaker, mix, obtain clean fracturing fluid.
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