CN114686199A - Composite fracturing fluid system slickwater - Google Patents
Composite fracturing fluid system slickwater Download PDFInfo
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- CN114686199A CN114686199A CN202210428514.1A CN202210428514A CN114686199A CN 114686199 A CN114686199 A CN 114686199A CN 202210428514 A CN202210428514 A CN 202210428514A CN 114686199 A CN114686199 A CN 114686199A
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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
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
- C09K8/905—Biopolymers
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- 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
- 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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- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/24—Bacteria or enzyme containing gel breakers
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
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Abstract
The invention relates to the field of oil exploitation, in particular to a composite fracturing fluid system slickwater which is prepared from the following components in parts by weight: 0.5-2% of biopolymer, 0.05-0.2% of bactericide, 0.5-2% of clay stabilizer, 1-4% of bio-enzyme gel breaker, 0.05-0.5% of cleanup additive and the balance of water; the biopolymer is made from Sphingomonas bacterium (A)Sphingomonas) Metabolic production, metabolite acquisition process: selecting 1-ring slant strain, inoculating the strain into 100ml of seed culture medium, culturing for 16-18 hours at 25-30 ℃, inoculating the grown seed solution into 200ml of fermentation culture solution according to the inoculation amount of 10-15% after the seed is mature, culturing at 25-30 ℃, fermenting for 72-75 hours, then metabolizing to produce, and finally carrying out coarse extraction on fermentation liquor by 95% alcohol.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to a composite fracturing fluid system slickwater.
Background
Fracturing is a main method for modifying a low-permeability oil layer, and can change the seepage of reservoir fluid, form a spatial reticular fracture in a stratum and increase the flow conductivity. The adopted fracturing fluid determines the fracturing effect to a great extent, and has certain requirements on the viscosity of the fracturing fluid, so that the fracturing fluid can become low-viscosity fluid after fracturing and is easy to flow back, and damage to an oil-gas layer in a stratum is avoided.
The drag reducer used in the slickwater is more in varieties of acrylamide polymers, wherein the guar gum and derivatives thereof are used most widely, but the problems of incomplete gum breaking, easy gum returning, high residue content of gum breaking liquid and the like generally exist, the blockage injury is easily formed, the permeability of a matrix and the flow conductivity of cracks are reduced, the fracturing transformation effect is influenced, and meanwhile, the friction resistance of a vegetable gum fracturing liquid pipeline is high, so that the wellhead pressure under the same discharge capacity is high, and more hydraulic loss and higher construction risks are caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a composite fracturing fluid system slickwater. The system can provide a fracturing fluid slickwater system with low friction resistance, low viscosity, easy flowback and easy degradation, and can maintain good temperature resistance, salt tolerance and shear resistance in an operating environment, so that the fracturing fluid can better meet the requirement of reservoir transformation in medium-high temperature oil and gas fields.
The invention relates to slick water of a composite fracturing fluid system, which is prepared from the following components in parts by weight: 0.5-2% of biopolymer, 0.05-0.2% of bactericide, 0.5-2% of clay stabilizer, 1-4% of bio-enzyme gel breaker, 0.05-0.5% of cleanup additive and the balance of water; the above are mass percentage concentrations.
The biological enzyme gel breaker is further improved by 0.8-1.5% of a biopolymer, 0.1-0.15% of a bactericide, 1-1.5% of a clay stabilizer, 2-3% of a biological enzyme gel breaker, 0.2-0.3% of a cleanup additive and the balance of water.
As a further improvement of the invention, the biopolymer is made from Sphingomonas sp. (Sphingomonas) Metabolic production, metabolite acquisition process: selecting 1-ring slant strain, inoculating into 100ml seed culture medium, culturing at 25-30 deg.C for 16-18 hr, and culturing until the seed is matureInoculating the seed solution into 200ml of fermentation culture solution according to the inoculation amount of 10-15%, culturing at 25-30 ℃, fermenting for 72-75 hours, metabolizing to produce, and finally carrying out crude extraction on fermentation liquor by 95% alcohol to obtain the fermentation liquor.
As a further improvement of the invention, the seed culture medium is prepared from the following components in parts by weight: peptone 4.5g/L, sucrose 25g/L, K2HPO4 1.2g/L、MgSO4·7H2O 0.45g/L、KCl 0.25g/L、FeSO4·7H20.05g/L of O, the balance of water and the pH value of 6.5-7.5.
As a further improvement of the invention, the fermentation medium is prepared from the following components in parts by weight: sucrose 30g/L, NaNO3 3.5g/L、K2HPO4 2.5g/L、MgSO4·7H2O 0.25g/L、KCl 0.3g/L、FeSO4·7H20.06g/L of O, the balance of water and the pH value of 6.5-7.5.
As a further improvement of the invention, the bactericide is glutaraldehyde, the clay stabilizer is potassium chloride, the cleanup additive is one or two of betaine and lipopeptide surface activity which are mixed in any proportion, and the biological enzyme gel breaker is prepared by fermenting bacillus amyloliquefaciens.
The invention relates to slickwater of a composite fracturing fluid system, which aims to solve the problems of gel breaking control and incomplete gel breaking of fracturing fluid and damage to residues of the fracturing fluid after gel breaking. The biological enzyme gel breaker decomposes specific glycosidic bonds in the polysaccharide polymer structure, can degrade the polymer into non-reducing monosaccharide and disaccharide, recovers activity after reaction and continues to participate in the reaction, and thoroughly decomposes the biological polymer in a short time. The biopolymer in the biopolymer slickwater system is prepared by microbial fermentation culture, and is further concentrated and purified to obtain an environment-friendly, temperature-resistant and salt-resistant product, so that the problems of incomplete gel breaking, easy gel returning, high friction resistance and the like of the conventional slickwater system are solved. The biopolymer slickwater has the advantages of no residue after gel breaking, low friction resistance, no residue in return liquid and the like.
The composite fracturing fluid system slickwater also has the following beneficial effects:
1. the biopolymer has good temperature resistance, salt tolerance and shear resistance at 90 ℃, good viscosity stability (0.5 percent of biopolymer, 45-90 ℃, 35.6 mPa.s) and strong salt resistance (0.5 percent of biopolymer, 3 percent of standard saline, 90 ℃, 34.6 mPa.s); the fracturing fluid system has good slickwater stability, strong salt resistance and good shearing performance;
2. aiming at the biopolymer, the biological enzyme gel breaker is adopted to decompose specific glycosidic bonds in the polysaccharide polymer structure, the gel is broken thoroughly, and the core damage rate is less than 10%;
3. the surfactant drainage assistant is added into the slickwater system, so that the slickwater system has good drainage capability, and the surface tension of the drainage fluid can reach below 18.0 mN/m.
Drawings
FIG. 1 is a plot of drag reduction rate versus flow.
Detailed Description
Example 1
The invention relates to slick water of a composite fracturing fluid system, which is prepared from the following components in parts by weight: 0.5% of biopolymer, 0.05% of bactericide, 0.5% of clay stabilizer, 1% of bio-enzyme gel breaker, 0.05% of cleanup additive and the balance of water; the above are mass percentage concentrations;
the biopolymer is produced by sphingomonas metabolism, and the metabolite obtaining process comprises the following steps: selecting 1-ring slant strain, inoculating into 100ml of seed culture medium, culturing at 25-30 ℃ for 16-18 hours, inoculating the grown seed solution into 200ml of fermentation culture solution according to the inoculum size of 10-15% after the seed culture is mature, culturing at 25-30 ℃, fermenting for 72-75 hours, metabolizing to produce, and finally, roughly extracting fermentation liquor by 95% alcohol to obtain the strain;
the seed culture medium is prepared from the following components in parts by weight: peptone 4.5g/L, sucrose 25g/L, K2HPO4 1.2g/L、MgSO4·7H2O 0.45g/L、KCl 0.25g/L、FeSO4·7H20.05g/L of O, the balance of water and the pH value of 6.5-7.5;
the fermentation medium is prepared from the following components in parts by weight: sucrose 30g/L, NaNO3 3.5g/L、K2HPO4 2.5g/L、MgSO4·7H2O 0.25g/L、KCl 0.3g/L、FeSO4·7H20.06g/L of O, the balance of water and the pH value of 6.5-7.5.
Example 2
The invention relates to slick water of a composite fracturing fluid system, which is prepared from the following components in parts by weight: 2% of biopolymer, 0.2% of glutaraldehyde, 2% of potassium chloride, 4% of bio-enzyme gel breaker, 0.5% of sodium cyclamate and the balance of water; the parts are all parts by mass;
the biopolymer is produced by sphingomonas metabolism, and the metabolite obtaining process comprises the following steps: selecting 1-ring slant strain, inoculating into 100ml of seed culture medium, culturing at 25-30 ℃ for 18 hours, inoculating the grown seed solution into 200ml of fermentation culture solution according to the inoculation amount of 10-15% after the seed culture is mature, culturing at 30 ℃, performing metabolism production after fermenting for 72 hours, and finally performing coarse extraction on the fermentation solution by using 95% alcohol to obtain the strain;
the seed culture medium is prepared from the following components in parts by weight: peptone 4.5g/L, sucrose 25g/L, K2HPO4 1.2g/L、MgSO4·7H2O 0.45g/L、KCl 0.25g/L、FeSO4·7H20.05g/L of O, the balance of water and the pH value of 6.5-7.5;
the fermentation medium is prepared from the following components in parts by weight: sucrose 30g/L, NaNO3 3.5g/L、K2HPO4 2.5g/L、MgSO4·7H2O 0.25g/L、KCl 0.3g/L、FeSO4·7H20.06g/L of O, the balance of water and the pH value of 6.5-7.5.
Example 3
The invention relates to slick water of a composite fracturing fluid system, which is prepared from the following components in parts by weight: 0.8% of biopolymer, 0.1% of glutaraldehyde, 1% of potassium chloride, 2% of bio-enzyme gel breaker, 0.2% of sodium cyclamate and the balance of water; the biopolymer was prepared as in example 2.
Example 4
The invention relates to slick water of a composite fracturing fluid system, which is prepared from the following components in parts by weight: 1.5% of biopolymer, 0.15% of glutaraldehyde, 1.5% of potassium chloride, 3% of biological enzyme gel breaker, 0.3% of lipopeptide surfactant and the balance of water. The lipopeptide surfactant is added, in the fracturing operation link, the lipopeptide surfactant in the reservoir plays a role in changing the surface wettability of the rock reservoir, so that the rock wettability is changed from lipophilicity to hydrophilicity, the recovery ratio after fracturing is improved, and the operation process is simple. The biopolymer was prepared as in example 2.
Example 5
The invention relates to slick water of a composite fracturing fluid system, which is prepared from the following components in parts by weight: 1% of biopolymer, 0.1% of glutaraldehyde, 1% of potassium chloride, 1.8% of bio-enzyme gel breaker, 0.3% of lipopeptide surfactant and the balance of water; the biopolymer was prepared as in example 2.
The construction process of the composite fracturing fluid system slickwater prepared in the embodiment 1-5 is as follows:
(1) adding a biopolymer into clear water or flowback liquid;
(2) adding the biopolymer, stirring uniformly, and continuously adding the bactericide, the clay stabilizer, the biological enzyme gel breaker and the cleanup additive;
(3) uniformly stirring the system, adding the system into a sand mixer, and adding sand, wherein the adding amount of the sand is 5-70% according to different stratum conditions;
(4) and closing the well for 60-120 minutes, and then open-blowing to realize the construction process.
The device comprises a liquid storage tank, a connecting pipeline, a fracturing blender truck, a sand tank, a fracturing truck, a wellhead, a sand removal tank and a medicament storage tank, wherein the liquid storage tank is connected with clear water or return liquid through a pipeline, a biopolymer is added into the clear water or the return liquid, the medicament storage tank is connected with the liquid storage tank, the fracturing blender truck and the fracturing blender truck, and the fracturing blender truck and the wellhead, and the return liquid obtained after wellhead construction and fracturing is reused after treatment.
The fracturing fluid mainly comprises a biopolymer drag reducer, a clay stabilizer, a bactericide, a cleanup additive and a bio-enzyme gel breaker, has the characteristics of low viscosity, low friction resistance, easy flowback and the like, can solve the problems of incomplete flowback, large friction resistance and the like of the existing fracturing fluid, mainly solves the problems of poor temperature resistance and shear resistance of the polymer and difficult sand carrying caused by high temperature of a medium-high temperature reservoir, has great significance for the modification of the medium-high temperature reservoir in a low-permeability oil and gas field, and is applicable to the reservoir with the temperature ranging from 45 ℃ to 90 ℃. The properties of the slickwater fracturing fluids in examples 1-5 of the application are measured according to the methods and indexes in the NB/T14003.3-2017 continuous mixed fracturing fluid performance index and evaluation method, and are recorded in table 1, wherein a control example in the table 1 is a commercial Guanghan Huaxing BA1-9 slickwater product.
TABLE 1
Indoor effect evaluation:
and testing the resistance reduction effect of the sliding aqueous solution of the biopolymer fracturing fluid system with different mass fractions by using a circulating pipeline friction resistance testing system. And (3) comparing the pressure difference of the water for liquid preparation and the slippery water solution flowing in the pipeline, and calculating the drag reduction rate D of the slippery water solution according to the formula (1). The drag reduction effect of the drag reducer is evaluated according to the size of the drag reduction rate, the relationship between the drag reduction rate and the flow is shown in figure 1, and the maximum drag reduction rate can reach 73.2%.
In the formula, D represents the resistance reduction rate,%;
delta p water-pressure drop of clean water in the pipeline, MPa;
Δ p slickwater — the pressure drop, MPa, of the slickwater in the test system.
Claims (6)
1. A composite fracturing fluid system slickwater is prepared from the following components: 0.5-2% of biopolymer, 0.05-0.2% of bactericide, 0.5-2% of clay stabilizer, 1-4% of bio-enzyme gel breaker, 0.05-0.5% of cleanup additive and the balance of water; the above are mass percentage concentrations.
2. The composite fracturing fluid system slickwater of claim 1, wherein the composite fracturing fluid system slickwater is characterized by comprising 0.8-1.5% of biopolymer, 0.1-0.15% of bactericide, 1-1.5% of clay stabilizer, 2-3% of bio-enzyme gel breaker, 0.2-0.3% of cleanup additive and the balance of water.
3. The composite fracturing fluid system slickwater of claim 1, wherein the biopolymer is produced by sphingomonas metabolism, and the metabolite obtaining process is as follows: selecting 1-ring slant strain, inoculating into 100ml of seed culture medium, culturing at 25-30 ℃ for 16-18 hours, inoculating the grown seed solution into 200ml of fermentation culture solution according to the inoculum size of 10-15% after the seed culture is mature, culturing at 25-30 ℃, fermenting for 72-75 hours, metabolizing to produce, and finally, roughly extracting fermentation liquor by 95% alcohol to obtain the strain.
4. The slickwater of the composite fracturing fluid system and the preparation method thereof as claimed in claim 3, wherein the seed culture medium is prepared from the following components in parts by weight: peptone 4.5g/L, sucrose 25g/L, K2HPO4 1.2g/L、MgSO4·7H2O 0.45g/L、KCl 0.25g/L、FeSO4·7H20.05g/L of O, the balance of water and the pH value of 6.5-7.5.
5. The slickwater of the composite fracturing fluid system and the preparation method thereof as claimed in claim 3, wherein the fermentation medium is prepared from the following components in parts by weight: sucrose 30g/L, NaNO3 3.5g/L、K2HPO4 2.5g/L、MgSO4·7H2O 0.25g/L、KCl 0.3g/L、FeSO4·7H20.06g/L of O, the balance of water and the pH value of 6.5-7.5.
6. The composite fracturing fluid system slickwater of claim 1, wherein the bactericide is glutaraldehyde, the clay stabilizer is potassium chloride, the cleanup additive is one or a mixture of two of betaine and lipopeptide with surface activity in any proportion, and the biological enzyme gel breaker is prepared by fermenting bacillus amyloliquefaciens.
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Citations (8)
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| CN111218268A (en) * | 2018-11-26 | 2020-06-02 | 中国石油天然气股份有限公司 | Slickwater for compact sandstone reservoir and preparation method thereof |
| CN111621487A (en) * | 2020-06-11 | 2020-09-04 | 中国石油大学(华东) | Preparation and application method of microbial low-temperature gel breaking enzyme |
| CN113337267A (en) * | 2021-05-11 | 2021-09-03 | 大连知微生物科技有限公司 | Application of biological enzyme gel breaker in high-salinity water-based fracturing fluid product and fracturing fluid product |
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2022
- 2022-04-22 CN CN202210428514.1A patent/CN114686199A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060166837A1 (en) * | 2005-01-24 | 2006-07-27 | Lijun Lin | Methods of treating subterranean formations with heteropolysaccharides based fluids |
| US20080026957A1 (en) * | 2005-01-24 | 2008-01-31 | Gurmen M N | Treatment and Production of Subterranean Formations with Heteropolysaccharides |
| CN101880523A (en) * | 2010-07-02 | 2010-11-10 | 大连百奥泰科技有限公司 | Enzyme-microorganism coupled fracturing fluid system and preparation and application thereof |
| CN106939160A (en) * | 2016-04-19 | 2017-07-11 | 山东科瑞石油工程技术研究院 | A kind of high mineralization water quality clean fracturing fluid |
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| CN111218268A (en) * | 2018-11-26 | 2020-06-02 | 中国石油天然气股份有限公司 | Slickwater for compact sandstone reservoir and preparation method thereof |
| CN111621487A (en) * | 2020-06-11 | 2020-09-04 | 中国石油大学(华东) | Preparation and application method of microbial low-temperature gel breaking enzyme |
| CN113337267A (en) * | 2021-05-11 | 2021-09-03 | 大连知微生物科技有限公司 | Application of biological enzyme gel breaker in high-salinity water-based fracturing fluid product and fracturing fluid product |
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