CN102352235A - Crosslinked acid fracturing fluid and preparation method thereof - Google Patents
Crosslinked acid fracturing fluid and preparation method thereof Download PDFInfo
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- CN102352235A CN102352235A CN 201110221050 CN201110221050A CN102352235A CN 102352235 A CN102352235 A CN 102352235A CN 201110221050 CN201110221050 CN 201110221050 CN 201110221050 A CN201110221050 A CN 201110221050A CN 102352235 A CN102352235 A CN 102352235A
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Abstract
The invention relates to a crosslinked acid fracturing fluid and a preparation method thereof. Carbonate rock ancient carbonate rock stratum under Changqing gas field is mainly treated by viscous acid acidification and does not have a fracturing construction viscosity. The crosslinked acid fracturing fluid of the invention comprises 65.2-87.6 parts of water, 10-30 parts of hydrochloric acid, 0.4-0.8 part of CJ2-10 acid gelatinizer, 1.0-2.0 parts of JL-10 cross-linking agent and 1.0-2.0 parts of corrosion inhibitor. During fracturing construction, when a prepared solution A is injected, the solution A and the cross-linking agent in a volume ratio of 100:2-100-1 are mixed to form a fracturing fluid. The water base fracturing fluid combining fracturing and acidification of the invention has low system gelatinizer concentration, high acid gel viscosity and little breaken gel residue, so as to reduce the harm of fracturing fluid on a reservoir stratum and enhance yield increase reconstruction effect.
Description
Technical field
The present invention relates to a kind of fracturing liquid that is used for carrying out when the oil-gas field yield-increasing technique is employed to need pressure break and acidifying and preparation method thereof; Be specifically a kind of can be in 10%～30% acid solution the base fluid of needs when swelling plays sticking modified polyacrylamide class gelling agent for acid fluid and in acid solution, forms pressure break fast; According to a certain percentage with the organic zirconium linking agent; Form crosslinked gel; In pressure break, acidification is carried out on the stratum, reach the effect of transforming the stratum.
Technical background
The stratum characteristic of low hole, long celebrating gas field, hypotonic, low pressure makes pressure break, acidifying become and obtains the requisite a kind of transformation means of gas field high yield.For ancient carbonate formation under the long celebrating gas field; Main employing is the gelled acid acidifying at present; It has good sticking warm nature and shear resistant; Leak-off is slow, hydraulic loss is little; Can reduce the hydrochlorate speed of response significantly; Penetration depth is big, can reach the purpose of deep acidizing, but does not possess the pressing crack construction of carrying out operation viscosity.
Summary of the invention
The technical problem that the present invention solved provides a kind of no matter be gelled acid acidifying or crosslinked gel sandfrac, and the two can only be acidifying or pressure break, can realize cross-linked acid fracturing liquid of sandfrac and preparation method thereof simultaneously again at acidifying.
For solving above-mentioned technical problem, the technical scheme that the present invention takes:
A kind of modified polyacrylamide class gelling agent for acid fluid, its special character is: be made up of according to weight part following material:
65.2～87.6 parts in water
10～30 parts of hydrochloric acid
0.4～0.8 part of CJ2-10 gelling agent for acid fluid
1.0 ~ 2.0 parts of JL-10 linking agents
1.0 ~ 2.0 parts of inhibiter.
It is main monomer that above-mentioned CJ2-10 gelling agent for acid fluid adopts with the acrylamide, carries out the crosslinkable gelling agent for acid fluid of quarternary copolymerized synthetic with anionic monomer and properties-correcting agent cationic monomer, non-ionic monomer, and molecular weight is 800-1,000 ten thousand.
Above-mentioned JL-10 linking agent adopts the organic zirconium linking agent.
Above-mentioned hydrochloric acid is the technical hydrochloric acid of concentration 31%.
Above-mentioned inhibiter is the Mannich base corrosion inhibitors for acidic media.
A kind of preparation method of modified polyacrylamide class gelling agent for acid fluid, its special character is: realize through following steps:
(1), preparation solution A: in container, add the gentle erosion of entry agent, slowly pouring hydrochloric acid into, under with pump circulation or agitator condition of stirring; Slowly add the CJ2-10 gelling agent for acid fluid; Add the continued circulation or stir 30 minutes,, form solution A so that liquid mixing is abundant;
(2), when pressing crack construction, when pump is annotated solution A,, mix and form fracturing liquid with the volume ratio of solution A: linking agent=100:2～100:1 with solution A and linking agent.
Compared with prior art, beneficial effect of the present invention:
1, taking grittiness can be good, and proppant settlement rate is less than 0.8mm/s.
2, but the scene is long storage period, and behind the placement 120h, cross-linking effect is good.
3, the anti-shearing of heatproof under 80 ℃, shears that viscosity is 88mPas behind the 60min.
4, residue content is low, and the residue content of 0.6 % acid, 4 liquid viscosifying agent systems only is 200mg/l.
5, broken glue is thorough, and the surface tension of breaking glue solution is 21.32mN/m.
6, the present invention's aqueous fracturing fluid that fracture acidizing is combined, high, the broken glue residue of low, the sour frozen glue viscosity of system viscosifying agent concentration is low, has reduced the injury of fracturing liquid to reservoir, improves the raising the output correctional effect.
Description of drawings
Fig. 1 is a heat resistance graphic representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
The present invention is made up of according to weight part following material:
65.2～87.6 parts in water
10～30 parts of hydrochloric acid
0.4～0.8 part of CJ2-10 gelling agent for acid fluid
1.0 ~ 2.0 parts of JL-10 linking agents
1.0 ~ 2.0 parts of inhibiter.
It is main monomer that above-mentioned CJ2-10 gelling agent for acid fluid adopts with the acrylamide, carries out the crosslinkable gelling agent for acid fluid of quarternary copolymerized synthetic with anionic monomer and properties-correcting agent cationic monomer, non-ionic monomer, and molecular weight is 800-1,000 ten thousand.
Above-mentioned JL-10 linking agent adopts the organic zirconium linking agent.
Above-mentioned hydrochloric acid is the technical hydrochloric acid of concentration 31%.
Above-mentioned inhibiter is the Mannich base corrosion inhibitors for acidic media.
The present invention realizes through following steps:
(1), preparation solution A: in container, add the gentle erosion of entry agent, slowly pouring hydrochloric acid into, under with pump circulation or agitator condition of stirring; Slowly add the CJ2-10 gelling agent for acid fluid; Add the continued circulation or stir 30 minutes,, form solution A so that liquid mixing is abundant;
(2), when pressing crack construction, when pump is annotated solution A,, mix and form fracturing liquid with the volume ratio of solution A: linking agent=100:2～100:1 with solution A and linking agent.
Embodiment 1: according to each material of following proportion by weight:
65.2 parts in water
10 parts of hydrochloric acid
0.4 part of CJ2-10 gelling agent for acid fluid
1.0 parts of organic zirconium linking agents
1.0 parts of Mannich base corrosion inhibitors for acidic media.
Above-mentioned hydrochloric acid is the technical hydrochloric acid of concentration 31%.
The present invention realizes through following steps:
(1), preparation solution A: in container, add entry and Mannich base corrosion inhibitors for acidic media, slowly pouring hydrochloric acid into, under with pump circulation or agitator condition of stirring; Slowly add the CJ2-10 gelling agent for acid fluid; Add the continued circulation or stir 30 minutes,, form solution A so that liquid mixing is abundant;
(2), when pressing crack construction, when pump is annotated solution A, with solution A and organic zirconium linking agent, with solution A: the volume ratio of organic zirconium linking agent=100:2 is mixed and is formed fracturing liquid.
Embodiment 2: according to each material of following proportion by weight:
76.4 parts in water
20 parts of hydrochloric acid
0.6 part of CJ2-10 gelling agent for acid fluid
1.5 parts of organic zirconium linking agents
1.5 parts of Mannich base corrosion inhibitors for acidic media.
Above-mentioned hydrochloric acid is the technical hydrochloric acid of concentration 31%.
The present invention realizes through following steps:
(1), preparation solution A: in container, add entry and Mannich base corrosion inhibitors for acidic media, slowly pouring hydrochloric acid into, under with pump circulation or agitator condition of stirring; Slowly add the CJ2-10 gelling agent for acid fluid; Add the continued circulation or stir 30 minutes,, form solution A so that liquid mixing is abundant;
(2), when pressing crack construction, when pump is annotated solution A, with solution A and organic zirconium linking agent, with solution A: the volume ratio of organic zirconium linking agent=100:1.5 is mixed and is formed fracturing liquid.
Embodiment 3: according to each material of following proportion by weight:
87.6 parts in water
30 parts of hydrochloric acid
0.8 part of CJ2-10 gelling agent for acid fluid
2.0 parts of JL-10 linking agents
12.0 parts of inhibiter.
The present invention realizes through following steps:
(1), preparation solution A: in container, add entry and Mannich base corrosion inhibitors for acidic media, slowly pouring hydrochloric acid into, under with pump circulation or agitator condition of stirring; Slowly add the CJ2-10 gelling agent for acid fluid; Add the continued circulation or stir 30 minutes,, form solution A so that liquid mixing is abundant;
(2), when pressing crack construction, when pump is annotated solution A, with solution A and organic zirconium linking agent, with solution A: the volume ratio of organic zirconium linking agent=100:1 is mixed and is formed fracturing liquid.
Experimental data:
One, fracturing liquid system
1, base fluid:
According to each material of the above embodiments 2 proportionings.
2, linking agent JL-10
Two, test method
The heatproof test is carried out in base fluid and the crosslinked rear section of linking agent JL-10 100:1.8, gets a part of crosslinked gel and ammonium persulphate again and breaks its breaking glue solution performance of glue after-filtration survey.
Three, performance
1, heat resistance is referring to Fig. 1
2, breaking glue solution performance evaluation
| Project | Surface tension (mN/m) | Anti-swollen ability |
| Breaking glue solution behind the frozen glue | 27.95 | 87.6% |
3, residue content: 315mg/L
Four, conclusion
Through above test contrast, can find out that the cross-linked acid fracturing liquid need not to add tensio-active agent etc. and itself possesses the function that reduces surface tension, prevents clay swelling, and is better than conventional guanidine glue temperature tolerance simultaneously.
Claims (6)
1. modified polyacrylamide class gelling agent for acid fluid is characterized in that: be made up of according to weight part following material:
65.2～87.6 parts in water
10～30 parts of hydrochloric acid
0.4～0.8 part of CJ2-10 gelling agent for acid fluid
1.0 ~ 2.0 parts of JL-10 linking agents
1.0 ~ 2.0 parts of inhibiter.
2. a kind of modified polyacrylamide class gelling agent for acid fluid according to claim 1; It is characterized in that: it is main monomer that described CJ2-10 gelling agent for acid fluid adopts with the acrylamide; Carry out the crosslinkable gelling agent for acid fluid of quarternary copolymerized synthetic with anionic monomer and properties-correcting agent cationic monomer, non-ionic monomer, molecular weight is 800-1,000 ten thousand.
3. a kind of modified polyacrylamide class gelling agent for acid fluid according to claim 1 and 2 is characterized in that: described JL-10 linking agent adopts the organic zirconium linking agent.
4. a kind of modified polyacrylamide class gelling agent for acid fluid according to claim 3, it is characterized in that: described hydrochloric acid is the technical hydrochloric acid of concentration 31%.
5. a kind of modified polyacrylamide class gelling agent for acid fluid according to claim 4, it is characterized in that: described inhibiter is the Mannich base corrosion inhibitors for acidic media.
6. according to any described a kind of modified polyacrylamide class gelling agent for acid fluid of aforesaid right requirement, it is characterized in that: the preparation method of described a kind of modified polyacrylamide class gelling agent for acid fluid is characterized in that: realize through following steps:
(1), preparation solution A: in container, add the gentle erosion of entry agent, slowly pouring hydrochloric acid into, under with pump circulation or agitator condition of stirring; Slowly add the CJ2-10 gelling agent for acid fluid; Add the continued circulation or stir 30 minutes,, form solution A so that liquid mixing is abundant;
(2), when pressing crack construction, when pump is annotated solution A,, mix and form fracturing liquid with the volume ratio of solution A: linking agent=100:2～100:1 with solution A and linking agent.
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| CN 201110221050 CN102352235A (en) | 2011-08-03 | 2011-08-03 | Crosslinked acid fracturing fluid and preparation method thereof |
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| CN 201110221050 CN102352235A (en) | 2011-08-03 | 2011-08-03 | Crosslinked acid fracturing fluid and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103694987A (en) * | 2013-12-17 | 2014-04-02 | 常州大学 | Composite acidizing and fracturing liquid and preparation method thereof |
| CN103805158A (en) * | 2012-11-09 | 2014-05-21 | 中国石油化工股份有限公司 | Cross-linked acid acidizing fracturing fluid, preparation method and application thereof |
| CN105089602A (en) * | 2015-06-18 | 2015-11-25 | 中国石油化工股份有限公司 | Variant-hydrochloric-acid-concentration acid fracturing method for carbonate reservoir |
| CN105713594A (en) * | 2016-01-21 | 2016-06-29 | 西安石油大学 | Viscous acid and preparation method thereof |
| CN108822826A (en) * | 2018-07-16 | 2018-11-16 | 中国石油大学(华东) | A kind of low corrosion green crosslinked acid fracturing fluid and the preparation method and application thereof |
| CN115595137A (en) * | 2021-07-07 | 2023-01-13 | 中国石油化工股份有限公司（Cn） | Acidic guanidine gum fracturing fluid and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103805158A (en) * | 2012-11-09 | 2014-05-21 | 中国石油化工股份有限公司 | Cross-linked acid acidizing fracturing fluid, preparation method and application thereof |
| CN103694987A (en) * | 2013-12-17 | 2014-04-02 | 常州大学 | Composite acidizing and fracturing liquid and preparation method thereof |
| CN105089602A (en) * | 2015-06-18 | 2015-11-25 | 中国石油化工股份有限公司 | Variant-hydrochloric-acid-concentration acid fracturing method for carbonate reservoir |
| CN105713594A (en) * | 2016-01-21 | 2016-06-29 | 西安石油大学 | Viscous acid and preparation method thereof |
| CN108822826A (en) * | 2018-07-16 | 2018-11-16 | 中国石油大学(华东) | A kind of low corrosion green crosslinked acid fracturing fluid and the preparation method and application thereof |
| CN115595137A (en) * | 2021-07-07 | 2023-01-13 | 中国石油化工股份有限公司（Cn） | Acidic guanidine gum fracturing fluid and application thereof |
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Application publication date: 20120215 |