CN107686724A - Ultralow-water-content carbon dioxide fracturing fluid and preparation method thereof - Google Patents
Ultralow-water-content carbon dioxide fracturing fluid and preparation method thereof Download PDFInfo
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- CN107686724A CN107686724A CN201710778844.2A CN201710778844A CN107686724A CN 107686724 A CN107686724 A CN 107686724A CN 201710778844 A CN201710778844 A CN 201710778844A CN 107686724 A CN107686724 A CN 107686724A
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- carbon dioxide
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 85
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000012530 fluid Substances 0.000 title abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 50
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 11
- 229920006318 anionic polymer Polymers 0.000 claims abstract description 10
- 230000009466 transformation Effects 0.000 claims abstract description 9
- 239000004576 sand Substances 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000005187 foaming Methods 0.000 claims description 19
- 239000000243 solution Substances 0.000 claims description 16
- 230000002209 hydrophobic effect Effects 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 13
- 229920000642 polymer Polymers 0.000 claims description 13
- 239000006260 foam Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 125000000129 anionic group Chemical group 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 230000008961 swelling Effects 0.000 claims description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims 1
- KPAMAAOTLJSEAR-UHFFFAOYSA-N [N].O=C=O Chemical compound [N].O=C=O KPAMAAOTLJSEAR-UHFFFAOYSA-N 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 1
- 230000008719 thickening Effects 0.000 abstract description 8
- 125000001165 hydrophobic group Chemical group 0.000 abstract description 5
- 229960004424 carbon dioxide Drugs 0.000 description 59
- 238000005516 engineering process Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000001273 butane Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229940026110 carbon dioxide / nitrogen Drugs 0.000 description 2
- 229910002090 carbon oxide Inorganic materials 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- -1 alkyl phosphates Chemical class 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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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
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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
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention provides an ultralow-water-content carbon dioxide fracturing fluid and a preparation method thereof. The ultralow-water-content carbon dioxide fracturing fluid comprises the following raw materials by taking the total mass of the ultralow-water-content carbon dioxide fracturing fluid as 100 percent: 3 to 10 weight percent of water, 0.01 to 0.05 weight percent of anionic polymer containing hydrophobic groups, 30 to 50 weight percent of gaseous carbon dioxide or nitrogen and the balance of liquid carbon dioxide. The invention also provides a preparation method of the fracturing fluid. The ultralow-water-content carbon dioxide fracturing fluid can solve the technical problem that thickening and sand carrying of the conventional anhydrous fracturing fluid are difficult, and can also solve the technical problem of large water consumption in the large-scale volume transformation process.
Description
Technical field
The present invention relates to a kind of fracturing fluid, more particularly to a kind of ultralow aqueous carbon dioxide pressure break liquid, belong to fracturing fluid
Technical field.
Background technology
With continually developing for unconventional reservoir, there can be the fracturing technique of effective exploitation reservoir more and more important.With shale
Oil gas needs extensive volume fracturing to compensate for the energy to a certain extent to realize economic development for the unconventional reservoir of representative
Demand, still, another aspect aqueous fracturing fluid in use, the environment that runs into, returns discharge opeing processing and conventional pressure break
Limit the application of hydraulic fracturing technology to a certain extent to the problems such as wilderness demand of water, lot of domestic and international experts and scholars are to mesh
Preceding conventional aqueous fracturing fluid is queried, and water can be used for opening reservoir generation crack, but water is also easy to produce in reservoir simultaneously
Self-priming acts on the water for causing these to open reservoir and is also all trapped in the inside, and producing water-blocking effect influences effect of increasing production after pressure.
It is a kind of green peace to replace the dosage of water or reduction water as pressure break medium using anhydrous or ultralow aqueous fracturing fluid
Complete efficient technology, and the future thrust of fracture technology.
Ultralow aqueous and anhydrous fracturing technique has following technical advantage：It can avoid and reduce aqueous phase invasion pair as far as possible
The injury of oil-gas Layer, is avoided to underground water pollution, while most of LPG, CO2Or N2Supercritical state is can reach under formation conditions
State, supercritical gas surface tension are zero, good fluidity, can enter any space more than gas molecule, therefore for hypotonic
Compact oil reservoir, its maximum advantage are can to enter the inaccessiable microcrack of conventional aqueous fracturing fluid, are linked up to greatest extent
Fracture network in reservoir, can further improve yield.Compared with conventional water-based fracturing, anhydrous pressure break injures to stratum zero, tool
There is good volume increase energy increasing function, saved great lot of water resources, reached energy-saving and emission-reduction, green construction requirement, for
Hypotonic compact oil reservoir cleaning, Efficient Development are of far-reaching significance, have broad application prospects.
The research of anhydrous fracturing technique in recent years is always the focus of domestic and international stimulation technology, and anhydrous fracturing technique
Key problem is exactly that liquid thickener takes sand problem.Wherein, Canadian Gasfrac companies develop LPG (liquefied petroleums first
Gas) anhydrous fracturing technique (US20070204991) is more alkyl phosphates it comprises the thickener of LPG fracturing fluids.The country exists
Cui Weixiang from Oil Exploration in China developmental research institute in anhydrous fracturing technique et al. develops a kind of liquefied butane fracturing fluid
And technology of preparing (201310359226.6), wherein containing the thickener of nonaqueous liquid butane frac liquid, crosslinking agent synthesis side
Method, and liquefied butane fracturing fluid is in the preparation method in laboratory." one kind of Chinese Petroleum Univ. Zhang Jing et al. applications
Carbon dioxide-drag reduction water composite fracturing method " application for a patent for invention (Application No. 201610216886.2) is disclosed a kind of suitable
What the composite fracturing liquid and preparation method thereof, PetroChina Company Ltd. Wang Feng et al. for liquid carbon dioxide was applied
A kind of a kind of disclosed use of " liquid carbon dioxide fracturing fluid " application for a patent for invention (Application No. 201510434208.9) is received
Rice coated fiber is used for the technical method for reducing frictional resistance in operating tool string, and its nano coating fiber can also be in liquid carbon dioxide
Network of fibers is formed in pressure fluid, so as to play improve, the solid-carrying performance of fracturing fluid, change proppant subsidence style, slow down branch
Support the effect of the rate of settling of agent.
Anhydrous fracturing technique is focused primarily upon completely using LPG or liquid carbon dioxide etc. both at home and abroad above, but
Although 100% using LPG can reach preferably thickening and solid-carrying performance, as fracturing fluid exist larger construction risk and
Potential safety hazard.Compared to LPG, liquid carbon dioxide fracturing fluid is safer and split to reservoir is ideal entirely without hydraulic pressure
Liquid technology.But skill be present using the fracturing fluid thickening and solid-carrying performance aspect of liquid carbon dioxide fracturing fluid technology at present
Art is difficult.
The content of the invention
In order to solve problem of the prior art, it is an object of the invention to provide a kind of changing suitable for fine and close oil and gas reservoir
Make, demand of traditional fracturing fluid to water can be greatly reduced, while improve the viscosity of fracturing fluid, enhancing fracturing fluid takes grittiness
Can, improve ultralow aqueous (ultralow aqueous refer to water content in below 10wt%) the carbon dioxide pressure break liquid of crack complexity.
In order to realize above-mentioned technical purpose, present invention firstly provides the invention provides a kind of ultralow aqueous carbon dioxide
Fracturing fluid, counted using the gross mass of the ultralow aqueous carbon dioxide pressure break liquid as 100%, the ultralow aqueous carbon dioxide pressure break liquid
Raw material composition includes：3wt%-10wt% water, 0.01wt%-0.05wt% anionic polymer containing hydrophobic grouping,
30wt%-50wt% gaseous carbon dioxide or nitrogen, and the liquid carbon dioxide of surplus, wherein, the ultralow aqueous dioxy
The mass percent sum for changing each raw material composition in carbon fracturing fluid is 100%.
In the ultralow aqueous carbon dioxide pressure break liquid of the present invention, it is preferable that the anionic containing hydrophobic grouping of use gathers
Compound is partially hydrolyzed polyacrylamide (PHPA), and the hydrophobic grouping of the anionic polymer containing hydrophobic grouping is hydrophobic for C12-C22 alkyl
Group, molecular weight are 100,000-500 ten thousand, anionic group is carboxylic acid or sulfonic acid.
Present invention also offers the preparation method of above-mentioned ultralow aqueous carbon dioxide pressure break liquid, the preparation method includes following
Step：
Step 1：It is soluble in water that hydrophobic grouping anionic polymer will be contained, stirring swelling forms polymer solution；
Step 2：Gaseous carbon dioxide or nitrogen are mixed with polymer solution, carbon dioxide foaming is made；
Step 3：It is the close of 4MPa-5MPa by carbon dioxide foaming injection pressure under 0 DEG C -20 DEG C (being preferably 20 DEG C)
Close in container, liquid carbon dioxide is injected into container, continue to stir 0.5min-10min (being preferably 1min), obtain ultralow contain
Water carbon dioxide pressure break liquid.
In the above-mentioned preparation method of the present invention, it is preferable that by foam maker by gaseous carbon dioxide or nitrogen with
Carbon dioxide foaming is made in polymer solution.
Above-mentioned ultralow aqueous carbon dioxide pressure break liquid provided by the invention is applied to fine and close oil, tight gas and shale gas storage
The transformation of layer, the extensive volume transformation of the fine and close oil that is particularly suitable for use in, gas unconventional reservoir.
When the above-mentioned ultralow aqueous carbon dioxide pressure break liquid of the present invention is specifically used for reservoir reconstruction, comprise the following steps：
It is soluble in water that hydrophobic grouping anionic polymer will be contained, form polymer solution；
In fracturing process, polymer solution is mixed with gaseous carbon dioxide or nitrogen, after foam maker, entered
Enter to mix brake and mixed with proppants, be then mixed into pit shaft with liquid carbon dioxide, complete the transformation to reservoir.
Preferably, the addition of proppant is that sand ratio is 2%-25%:1.
It is specific low, comprise the following steps：
It is soluble in water that hydrophobic grouping anionic polymer will be contained, polymer solution is configured to and is put in frac tank；
In fracturing process, polymer solution is mixed with gaseous carbon dioxide or nitrogen, formed by foam maker
Ultralow aqueous carbon dioxide/nitrogen foam fracturing fluid enters mixed brake and mixed with proppants；Proppant is according to live pressing crack construction
Demand, select suitable addition；
High pressure line is sent into by pump truck, threeway pipeline is connected in high pressure line and before entering well head, contains proppant
Ultralow aqueous carbon dioxide/nitrogen foam fracturing fluid is mixed into pit shaft with liquid carbon dioxide liquid, completes to change reservoir
Make.
Traditional fracturing fluid can be greatly reduced to water in above-mentioned ultralow aqueous carbon dioxide pressure break liquid provided by the invention
Demand, while improve the viscosity of fracturing fluid.The viscosity of liquid carbon dioxide is water liquid in the range of 0.05-0.13mPs
The 1/10-1/20 of viscosity, conventional aqueous fracturing fluid thickening technology do not apply to the thickening of carbon dioxide pressure break liquid, existing pressurized carbon dioxide
Liquid viscosity can reach 20mPs after splitting liquid thickening, and thickening multiple is 150-498, and of the invention ultralow aqueous two
Carbonoxide fracturing fluid liquid viscosity can reach 70mPs, be 3.5 times of prior art, thickening effect is notable, while this hair
The fracturing fluid solid-carrying performance of bright fracturing fluid also further enhances, and improves crack complexity, ultralow aqueous pressure break of the invention
Liquid has the function that to increase stratum energy under the conditions of ground environment.
The low thickening of viscosity of the existing anhydrous fracturing fluid of carbon dioxide is difficult, causes the anhydrous fracturing fluid of carbon dioxide to take sand and is stranded
Difficulty, construction risk is big, and ultralow aqueous carbon dioxide pressure break liquid of the invention can increase considerably liquid viscosity and elasticity, viscosity
Increase with elasticity takes sand stability to fracturing fluid, particularly improves construction sand ratio and plays an important roll, can solve at present
The difficult technical barrier of sand is taken in anhydrous fracturing fluid thickening.
Simultaneously compared to the aqueous fracturing fluid of routine, due to containing water electrode in the ultralow aqueous carbon dioxide pressure break liquid of the present invention
It is few, water blocking damage can be greatly reduced, while can also solve the technical barriers such as water consumption in extensive volume transformation process is big.
Brief description of the drawings
Fig. 1 is ultralow aqueous carbon dioxide foaming/carbon dioxide pressure break fluid viscosity test result figure of embodiment 1.
Fig. 2 is ultralow aqueous carbon dioxide foaming/nitrogen fracturing fluid viscosity test result figure of embodiment 2.
Embodiment
In order to which technical characteristic, purpose and the beneficial effect of the present invention is more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but it is not intended that to the present invention can practical range restriction.
Embodiment 1
A kind of ultralow aqueous anhydrous fracturing fluid of carbon dioxide foaming/carbon dioxide is present embodiments provided, with its gross weight
For 100% meter, it includes：10% aqueous water, 0.01% hydrophobic group polyacrylamide GRF-1H, 40% gaseous state two
Carbonoxide, and the liquid carbon dioxide of surplus.
The ultralow aqueous carbon dioxide foaming/carbon dioxide pressure break liquid of the present embodiment can be prepared as follows：
Hydrophobic group polyacrylamide GRF-1H is uniformly dispersed in water by proportioning under normal temperature, is 25 DEG C in temperature
Under the conditions of stir 15min after, by GRF-1H solution temperature be 30 DEG C of water-baths in stand 4h；
The GRF-1H solution dissolved and carbon dioxide are mixed into carbon dioxide foaming；
Mixed in proportion in pressure duct with liquid carbon dioxide, obtain ultralow aqueous carbon dioxide foaming/titanium dioxide
Carbon fracturing fluid.
The ultralow aqueous carbon dioxide foaming that the present embodiment is prepared/carbon dioxide pressure break liquid carries out crush properties survey
Examination：Using pressure duct rheological experiment device, it is 10 DEG C to 100 DEG C to test it in temperature, shear rate 170s-1Under viscosity
Value, its result are as shown in Figure 1.
As can be seen from Figure 1 ultralow aqueous carbon dioxide foaming/carbon dioxide that the present embodiment is prepared is without hydraulic pressure
More than 30mPas can be maintained at by splitting fluid viscosity, there is preferable temperature and shearing sustainability.
Embodiment 2
A kind of ultralow aqueous carbon dioxide foaming/nitrogen fracturing fluid is present embodiments provided, using its gross weight as 100%
Meter, it includes：10% aqueous water, 0.02% hydrophobic group polyacrylamide GRF-1H, 40% nitrogen, and surplus
Liquid carbon dioxide
The ultralow aqueous carbon dioxide foaming/nitrogen fracturing fluid of the present embodiment can be prepared as follows：
Hydrophobic group polyacrylamide GRF-1H is uniformly dispersed in water by proportioning under normal temperature, is 25 DEG C in temperature
Under the conditions of stir 15min after, by GRF-1H solution temperature be 30 DEG C of water-baths in stand 4h；
The GRF-1H solution dissolved and carbon dioxide are mixed into carbon dioxide foam systems；
Mixed in proportion in pressure duct with nitrogen, obtain ultralow aqueous carbon dioxide foaming/nitrogen fracturing fluid.
The ultralow aqueous carbon dioxide foaming that the present embodiment is prepared/nitrogen fracturing fluid carries out crush properties test：
Using pressure duct rheological experiment device, it is 10 DEG C to 100 DEG C to test it in temperature, shear rate 170s-1Under viscosity number,
Its result is as shown in Figure 2.
As can be seen from Figure 2 ultralow aqueous carbon dioxide foaming/carbon dioxide that the present embodiment is prepared is without hydraulic pressure
More than 45mPas can be maintained at by splitting fluid viscosity, there is preferable temperature and shearing sustainability.
Above example illustrates that traditional fracturing fluid can be greatly reduced in ultralow aqueous carbon dioxide pressure break liquid of the invention
To the demand of water, while the viscosity of anhydrous fracturing fluid is improved, strengthen fracturing fluid solid-carrying performance, improve crack complexity.
Claims (10)
1. a kind of ultralow aqueous carbon dioxide pressure break liquid, it is characterised in that with total matter of the ultralow aqueous carbon dioxide pressure break liquid
Measure includes for 100% meter, the raw material composition of the ultralow aqueous carbon dioxide pressure break liquid：3wt%-10wt% water, 0.01wt%-
0.05wt% anionic polymer containing hydrophobic grouping, 30wt%-50wt% gaseous carbon dioxide or nitrogen, and surplus
Liquid carbon dioxide, wherein, the mass percent sum of each raw material composition is in the ultralow aqueous carbon dioxide pressure break liquid
100%.
2. ultralow aqueous carbon dioxide pressure break liquid according to claim 1, it is characterised in that described the moon containing hydrophobic grouping from
Subtype polymer is partially hydrolyzed polyacrylamide (PHPA).
3. ultralow aqueous carbon dioxide pressure break liquid according to claim 1 or 2, it is characterised in that described to contain hydrophobic grouping
The hydrophobic grouping of anionic polymer is C12-C22 alkyl hydrophobic grouping, molecular weight is 100,000-500 ten thousand, anionic group is
Carboxylic acid or sulfonic acid.
4. the preparation method of the ultralow aqueous carbon dioxide pressure break liquid described in claim any one of 1-3, it is characterised in that the system
Preparation Method comprises the following steps：
Step 1：It is soluble in water that hydrophobic grouping anionic polymer will be contained, stirring swelling forms polymer solution；
Step 2：Gaseous carbon dioxide or nitrogen are mixed with the polymer solution, carbon dioxide foaming is made；
Step 3：At 0 DEG C -20 DEG C, the carbon dioxide foaming is injected in the closed container that pressure is 4MPa-5MPa, to
Injection liquid carbon dioxide in container, stirs 0.5min-10min, obtains the ultralow aqueous carbon dioxide pressure break liquid.
5. preparation method according to claim 4, it is characterised in that by foam maker by gaseous carbon dioxide or nitrogen
Carbon dioxide foaming is made with polymer solution in gas.
6. preparation method according to claim 4, it is characterised in that in the step 2, at 20 DEG C, by described two
Aoxidize in carbon foam injection closed container.
7. preparation method according to claim 4, it is characterised in that in the step 3, the time of stirring is 1min.
8. the application of the ultralow aqueous carbon dioxide pressure break liquid described in claim any one of 1-3, it is characterised in that this is ultralow to contain
The carbon dioxide pressure break liquid of water is applied to the transformation of fine and close oil, tight gas and shale gas reservoir, and be particularly suitable for use in fine and close oil, gas are non-
The extensive volume transformation of conventional reservoir.
9. application according to claim 8, it is characterised in that the ultralow aqueous carbon dioxide pressure break liquid is specifically used for storage
During layer transformation, comprise the following steps：
It is soluble in water that hydrophobic grouping anionic polymer will be contained, form polymer solution；
In fracturing process, polymer solution is mixed with gaseous carbon dioxide or nitrogen, after foam maker, into mixed
Brake and mixed with proppants, are then mixed into pit shaft with liquid carbon dioxide, complete the transformation to reservoir.
10. application according to claim 9, it is characterised in that the addition of the proppant is that sand ratio is 2%-25%:
1。
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109233784A (en) * | 2018-10-24 | 2019-01-18 | 中国石油大学(北京) | A kind of mixed gas foam fracturing liquid system and its preparation |
| CN109372510A (en) * | 2018-11-26 | 2019-02-22 | 武汉工程大学 | A kind of method of carbon dioxide and water fluid-mixing pressure break limestone roof |
| CN109679643A (en) * | 2019-01-10 | 2019-04-26 | 中国石油大学(北京) | A kind of shale gas exploitation phlogisticated air/liquid CO2Double boundary layer foam fracturing fluids |
| CN114482963A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Reservoir transformation method for hydraulic fracturing and application |
| CN115873582A (en) * | 2022-12-27 | 2023-03-31 | 泰坦(天津)能源技术有限公司 | Composite carbon dioxide fracturing fluid and preparation method and application thereof |
| CN116064024A (en) * | 2021-11-01 | 2023-05-05 | 中国石油化工股份有限公司 | Foam fracturing fluid capable of adjusting phase permeability and preparation method thereof |
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| US4964467A (en) * | 1989-10-06 | 1990-10-23 | Halliburton Company | Non-aqueous viscosified carbon dioxide and method of use |
| US5002125A (en) * | 1989-08-02 | 1991-03-26 | The Western Company Of North America | Fracturing process using a viscosity stabilized energizing phase |
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| CN109372510A (en) * | 2018-11-26 | 2019-02-22 | 武汉工程大学 | A kind of method of carbon dioxide and water fluid-mixing pressure break limestone roof |
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| CN109679643B (en) * | 2019-01-10 | 2020-01-21 | 中国石油大学(北京) | Oxygen-reduced air/liquid CO for shale gas exploitation2Foam fracturing fluid with double interface layers |
| US10934467B2 (en) | 2019-01-10 | 2021-03-02 | China University Of Petroleum-Beijing | Foam fracturing fluid with double interface layers of a phlogisticated air-liquid CO2 for shale gas production and preparation method thereof |
| CN114482963A (en) * | 2020-10-27 | 2022-05-13 | 中国石油化工股份有限公司 | Reservoir transformation method for hydraulic fracturing and application |
| CN116064024A (en) * | 2021-11-01 | 2023-05-05 | 中国石油化工股份有限公司 | Foam fracturing fluid capable of adjusting phase permeability and preparation method thereof |
| CN115873582A (en) * | 2022-12-27 | 2023-03-31 | 泰坦(天津)能源技术有限公司 | Composite carbon dioxide fracturing fluid and preparation method and application thereof |
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