CN114874761A - Small-molecule recyclable fracturing fluid and use method thereof - Google Patents
Small-molecule recyclable fracturing fluid and use method thereof Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims description 19
- 150000003384 small molecules Chemical class 0.000 title claims description 16
- 239000002562 thickening agent Substances 0.000 claims abstract description 61
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims abstract description 52
- 239000007788 liquid Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000010276 construction Methods 0.000 claims abstract description 27
- 239000001103 potassium chloride Substances 0.000 claims abstract description 26
- 235000011164 potassium chloride Nutrition 0.000 claims abstract description 26
- 239000002699 waste material Substances 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims description 45
- 239000004094 surface-active agent Substances 0.000 claims description 27
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 23
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 22
- BKZXZGWHTRCFPX-UHFFFAOYSA-N 2-tert-butyl-6-methylphenol Chemical compound CC1=CC=CC(C(C)(C)C)=C1O BKZXZGWHTRCFPX-UHFFFAOYSA-N 0.000 claims description 11
- 125000006297 carbonyl amino group Chemical group [H]N([*:2])C([*:1])=O 0.000 claims description 11
- CUXKZYSCZCNPNX-UHFFFAOYSA-N tetradecan-1-amine;hydrobromide Chemical compound [Br-].CCCCCCCCCCCCCC[NH3+] CUXKZYSCZCNPNX-UHFFFAOYSA-N 0.000 claims description 7
- XQSBLCWFZRTIEO-UHFFFAOYSA-N hexadecan-1-amine;hydrobromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[NH3+] XQSBLCWFZRTIEO-UHFFFAOYSA-N 0.000 claims description 5
- GMPPXCJXWNFUFR-UHFFFAOYSA-N pentadecylazanium;bromide Chemical compound [Br-].CCCCCCCCCCCCCCC[NH3+] GMPPXCJXWNFUFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000004062 sedimentation Methods 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims 2
- 229930195733 hydrocarbon Natural products 0.000 claims 2
- 150000002430 hydrocarbons Chemical class 0.000 claims 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 abstract description 16
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 abstract description 8
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 abstract description 8
- 229920000642 polymer Polymers 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920001938 Vegetable gum Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
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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
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- 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
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- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention relates to a micromolecule recyclable fracturing fluid, which is characterized in that: the fracturing fluid consists of, by mass, 97-98% of clear water and 2-3% of MY-60 thickener; or the composite thickening agent consists of 97-98% of potassium chloride solution and 2-3% of MY-60 thickening agent in percentage by mass, wherein the concentration of the potassium chloride solution in percentage by mass is 1-5%. The invention can realize the repeated recycling of the gel-breaking flowback waste liquid of the self-gel-breaking flowback waste liquid, the guanidine gum and the polymer fracturing fluid, and the repeated recycling construction can reach 3 to 5 times.
Description
The application is a divisional application of Chinese patent application 201711089655.0 entitled "a small molecule recyclable fracturing fluid and a use method thereof" filed by the applicant on 11, 8 and 2017.
Technical Field
The invention relates to the technical field of fracturing modification of natural gas reservoirs, shale gas reservoirs and oil reservoir development, in particular to a small-molecule recyclable fracturing fluid for fracturing single wells or horizontal wells of low-permeability oil and gas reservoirs and a using method thereof.
Background
Fracturing is an important technical means for developing low-permeability oil and gas reservoirs, and mature and complete fracturing fluid systems, namely guanidine gum fracturing fluid systems, polymer fracturing fluids, surfactant fracturing fluid systems and the like are formed at present. The guanidine gum fracturing fluid system has better sand carrying performance, is simple and easy, has lower cost and is widely applied at present. However, the residual liquid of the guanidine gum fracturing fluid system faces a plurality of technical and cost problems in the aspect of reusing as the fracturing fluid. Firstly, the recycling cost is high, and the flowback liquid can be reused in other links of fracturing operation only as clean water after being treated, and cannot be used for sand fracturing construction. Once the guanidine gum fracturing fluid is broken, the flowback fluid cannot be thickened and recycled without adding a guanidine gum thickener and a treating agent again, and the polymer fracturing fluid has the same problem; secondly, the residues of the flowback fluid have obvious damage to the reservoir. The currently used surfactant fracturing fluid system carries sand by elasticity, has relatively low viscosity and small residues, is applied in a large scale, but has generally high price, and the pressed flowback fluid can only be used as clean water, part of the flowback fluid is reused, and the reutilization effect is poor; the existing fracturing fluids can not adopt gel breaking flowback fluids of other fracturing fluids to carry out secondary or multiple times of fracturing construction. In summary, in consideration of cost and technical factors, no fracturing fluid technical system which ensures the fracturing transformation effect, can be repeatedly recycled and can be simultaneously obtained with environmental protection exists at present.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a small-molecule recyclable fracturing fluid and a using method thereof, wherein on one hand, the self gel-breaking flowback waste liquid of the fracturing fluid can be recycled, and on the other hand, a thickening agent of the fracturing fluid can be directly used for secondary thickening of the gel-breaking flowback liquid of the guanidine gum and polymer fracturing fluid to carry out sand-carrying fracturing, so that the problem of recycling the flowback waste liquid of other fracturing fluids is solved. The fracturing fluid is suitable for fracturing a single well or a horizontal well of a low-permeability oil-gas reservoir.
The technical scheme of the invention is as follows: a micromolecule recyclable fracturing fluid is characterized in that: the fracturing fluid consists of, by mass, 97-98% of clear water and 2-3% of MY-60 thickener; or the composite thickening agent consists of 97-98% of potassium chloride solution and 2-3% of MY-60 thickening agent in percentage by mass, wherein the concentration of the potassium chloride solution in percentage by mass is 1-5%.
The MY-60 thickening agent is prepared from the following components in percentage by mass: 25-30% of rosinyl sulfonate gemini surfactant, 18-24% of tetradecyl ammonium bromide or pentadecyl ammonium bromide or hexadecyl ammonium bromide, 8-12% of 6-tert-butyl o-cresol, 20-25% of isopropanol and 9-15% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na
r is C 19 H 28 CONH 2 And n is an integer of 1 to 5.
The fracturing fluid has the temperature of 60 ℃ and the shear rate of 170S -1 Under the conditions of (2), the viscosity was more than 20 mPas.
The MY-60 thickening agent is liquid, and the viscosity is less than 50mPa.s at normal temperature.
The use method of the small-molecule recyclable fracturing fluid is characterized by comprising the following steps: the method comprises the following specific steps:
the first step is as follows: introducing MY-60 thickening agent with the formula amount into a sand mixing truck;
the second step is that: then, introducing clear water or a potassium chloride solution with the formula amount of 1-5% in mass percentage concentration into a sand mixing truck, and mixing the clear water or the potassium chloride solution with the MY-60 thickening agent in the sand mixing truck to form small-molecule recyclable fracturing fluid;
the third step: carrying out sand fracturing operation;
the fourth step: controlling open flow after the fracture is closed after the fracturing operation sand adding is finished;
the fifth step: the fracturing operation construction is finished;
and a sixth step: after the construction of the fracturing operation is finished, the waste liquid returned from the bottom of the well is collected again, and is discharged into a liquid storage tank for storage after sedimentation and sand removal;
the seventh step: when next fracturing construction is carried out, the MY-60 thickening agent is pumped into the sand mixing truck, then the flowback waste liquid stored in the liquid storage tank is introduced into the sand mixing truck and mixed with the MY-60 thickening agent in the sand mixing truck to form fracturing liquid for the second construction, wherein the mass percent of the MY-60 thickening agent is 2-3%, and the mass percent of the flowback waste liquid is 97-98%; and repeating the steps from three to six, and repeating the circulating construction for no more than 5 times.
And the viscosity of the fracturing fluid for forming the second fracturing construction is recovered to be more than 20 mPas, and the next fracturing reconstruction target is subjected to the fracturing reconstruction construction again.
The invention has the advantages that: compared with the prior art, the micromolecule recyclable fracturing fluid can realize the recycling of self gel breaking flow-back waste liquid, guar gum and polymer fracturing fluid gel breaking flow-back liquid, and the recycling construction can reach 3-5 times. The MY-60 thickening agent has the advantages that the sulfonate type gemini surfactant and other functional surfactants are compounded, so that better sand-carrying viscosity can be achieved under the condition of lower concentration of the thickening agent, the thickening agent can thicken fracturing fluid of vegetable gum fracturing fluid, other surfactants and polymer fracturing fluid, and the utilization rate of fracturing waste liquid is improved.
Detailed Description
Example 1
A micromolecule recyclable fracturing fluid consists of, by mass, 97-98% of clear water and 2-3% of MY-60 thickener; or the composite thickening agent consists of 97-98% of potassium chloride solution and 2-3% of MY-60 thickening agent in percentage by mass, wherein the concentration of the potassium chloride solution in percentage by mass is 1-5%.
The MY-60 thickening agent is prepared from the following components in percentage by mass: 25-30% of rosinyl sulfonate gemini surfactant, 18-24% of tetradecyl ammonium bromide or pentadecyl ammonium bromide or hexadecyl ammonium bromide, 8-12% of 6-tert-butyl o-cresol, 20-25% of isopropanol and 9-15% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na
r is C 19 H 28 CONH 2 And n is an integer of 1 to 5.
The application method of the micromolecule recyclable fracturing fluid comprises the following specific steps:
the first step is as follows: introducing MY-60 thickening agent with the formula amount into a sand mixing truck;
the second step is that: then, introducing clear water or a potassium chloride solution with the formula amount of 1-5% in mass percentage concentration into a sand mixing truck, and mixing the clear water or the potassium chloride solution with the MY-60 thickening agent in the sand mixing truck to form small-molecule recyclable fracturing fluid;
the third step: carrying out sand fracturing operation;
the fourth step: controlling open flow after the fracture is closed after the fracturing operation sand adding is finished;
the fifth step: the fracturing operation construction is finished;
and a sixth step: after the construction of the fracturing operation is finished, the waste liquid returned from the bottom of the well is collected again, and is discharged into a liquid storage tank for storage after sedimentation and sand removal;
the seventh step: when next fracturing construction is carried out, the MY-60 thickening agent is pumped into the sand mixing truck, then the flowback waste liquid stored in the liquid storage tank is introduced into the sand mixing truck and mixed with the MY-60 thickening agent in the sand mixing truck to form fracturing liquid for the second construction, wherein the mass percent of the MY-60 thickening agent is 2-3%, and the mass percent of the flowback waste liquid is 97-98%; and repeating the steps from three to six, and repeating the circulating construction for no more than 5 times.
Example 2
A micromolecule recyclable fracturing fluid consists of 97 percent of clear water and 3 percent of MY-60 thickening agent in percentage by mass; the MY-60 thickening agent is prepared from the following components in percentage by mass: 25% of rosinyl sulfonate type gemini surfactant, 24% of tetradecyl ammonium bromide, 12% of 6-tert-butyl o-cresol, 25% of isopropanol and 14% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na
r is C 19 H 28 CONH 2 And n is 1.
The application method of the micromolecule recyclable fracturing fluid comprises the following specific steps:
the first step is as follows: introducing MY-60 thickening agent with the formula amount into a sand mixing truck;
the second step is that: then, introducing clear water with the formula amount into a sand mixing truck, and mixing the clear water with a MY-60 thickening agent in the sand mixing truck to form micromolecule recyclable fracturing fluid;
the third step: carrying out sand fracturing operation;
the fourth step: controlling open flow after the fracture is closed after the fracturing operation sand adding is finished;
the fifth step: the fracturing operation construction is finished;
and a sixth step: after the construction of the fracturing operation is finished, the waste liquid returned from the bottom of the well is collected again, and is discharged into a liquid storage tank for storage after sedimentation and sand removal;
the seventh step: when next fracturing construction is carried out, the MY-60 thickening agent is pumped into the sand mixing truck, then the flowback waste liquid stored in the liquid storage tank is introduced into the sand mixing truck and mixed with the MY-60 thickening agent in the sand mixing truck to form fracturing liquid for the second construction, wherein the mass percent of the MY-60 thickening agent is 2-3%, and the mass percent of the flowback waste liquid is 97-98%; and repeating the steps from three to six, and repeating the circulating construction for no more than 5 times.
Example 3
A micromolecule recyclable fracturing fluid consists of clear water with the mass percentage of 98 percent and a MY-60 thickening agent with the mass percentage of 2 percent; the MY-60 thickening agent is prepared from the following components in percentage by mass: 30% of rosinyl sulfonate gemini surfactant, 23% of tetradecyl ammonium bromide, 8% of 6-tert-butyl o-cresol, 24% of isopropanol and 15% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 NaR is C 19 H 28 CONH 2 And n is an integer of 3.
The procedure was as in example 2.
Example 4
A micromolecule recyclable fracturing fluid consists of 97.5 percent of clear water and 2.5 percent of MY-60 thickening agent in percentage by mass; the MY-60 thickening agent is prepared from the following components in percentage by mass: 30% of rosinyl sulfonate gemini surfactant, 18% of tetradecyl ammonium bromide, 12% of 6-tert-butyl o-cresol, 25% of isopropanol and 15% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 NaR is C 19 H 28 CONH 2 And n is an integer of 5.
The procedure was as in example 2.
Example 5
A micromolecule recyclable fracturing fluid consists of 97.5 percent of clear water and 2.5 percent of MY-60 thickening agent in percentage by mass; the MY-60 thickening agent is prepared from the following components in percentage by mass: 29% of rosinyl sulfonate gemini surfactant, 23% of hexadecyl ammonium bromide, 11% of 6-tert-butyl o-cresol, 25% of isopropanol and 12% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na
r is C 19 H 28 CONH 2 And n is an integer of 5.
The method of use is the same as in example 2.
Example 6
A micromolecule recyclable fracturing fluid consists of 97.5 percent of clear water and 2.5 percent of MY-60 thickening agent in percentage by mass; the MY-60 thickening agent is prepared from the following components in percentage by mass: 30% of rosinyl sulfonate type gemini surfactant, 24% of pentadecyl ammonium bromide, 12% of 6-tert-butyl o-cresol, 25% of isopropanol and 9% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na
r is C 19 H 28 CONH 2 And n is an integer of 4.
The procedure was as in example 2.
Example 7
A micromolecule recyclable fracturing fluid consists of 97% by mass of a potassium chloride solution and 3% of a MY-60 thickening agent, wherein the mass percentage concentration of the potassium chloride solution is 1%; the MY-60 thickening agent is prepared from the following components in percentage by mass: 30% of rosinyl sulfonate type gemini surfactant, 24% of pentadecyl ammonium bromide, 12% of 6-tert-butyl o-cresol, 25% of isopropanol and 9% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na
r is C 19 H 28 CONH 2 And n is an integer of 2.
The method is basically the same as that used in example 2, except that: the second step is that: and then introducing the potassium chloride solution with the mass percentage concentration of 1% into a sand mixing truck according to the formula amount, and mixing the potassium chloride solution with the MY-60 thickening agent in the sand mixing truck to form the micromolecule recyclable fracturing fluid.
Example 8
A micromolecule recyclable fracturing fluid consists of 98% of potassium chloride solution and 2% of MY-60 thickening agent in percentage by mass, wherein the concentration of the potassium chloride solution in percentage by mass is 5%; the MY-60 thickening agent is prepared from the following components in percentage by mass: 30% of rosinyl sulfonate type gemini surfactant, 24% of tetradecyl ammonium bromide, 12% of 6-tert-butyl o-cresol, 20% of isopropanol and 14% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na
r is C 19 H 28 CONH 2 And n is an integer of 1.
Essentially the same procedure as used in example 7, except that: the second step is that: and then introducing a potassium chloride solution with the mass percentage concentration of 5% in the formula amount into a sand mixing truck, and mixing the potassium chloride solution with a MY-60 thickening agent in the sand mixing truck to form the micromolecule recyclable fracturing fluid.
Example 9
A micromolecule recyclable fracturing fluid consists of 97.5 percent by mass of potassium chloride solution and 2.5 percent by mass of MY-60 thickening agent, wherein the mass percent concentration of the potassium chloride solution is 3 percent; the MY-60 thickening agent is composed of the following components in percentage by mass: 30% of rosinyl sulfonate type gemini surfactant, 24% of hexadecyl ammonium bromide, 12% of 6-tert-butyl o-cresol, 20% of isopropanol and 14% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows:
NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na
r is C 19 H 28 CONH 2 And n is an integer of 3.
Essentially the same procedure as used in example 7, except that: the second step is that: and then introducing the potassium chloride solution with the mass percentage concentration of 3% into a sand mixing truck according to the formula amount, and mixing the potassium chloride solution with the MY-60 thickening agent in the sand mixing truck to form the micromolecule recyclable fracturing fluid.
Small molecule recyclable fracturing fluids of examples 1-9 aboveAt a temperature of 60 ℃ and a shear rate of 170S -1 The viscosity of the composition (1) was more than 20 mPas.
The MY-60 thickener in the small molecule recyclable fracturing fluid of examples 1-9 above is liquid and has a viscosity of less than 50mpa.s at room temperature. The normal temperature is generally 25 ℃.
The viscosity of the fracturing fluid for reconstruction in the method of using the small-molecule recyclable fracturing fluids of examples 1 to 9 was returned to 20mPa · s or more, and the next fracture reconstruction target was reconstructed. Thereby completing the reutilization of the fracturing fluid.
The chemicals involved in the small molecule recyclable fracturing fluids of the above examples are commercially available.
Compared with the prior art, on one hand, the self gel breaking flowback waste liquid of the fracturing fluid can be recycled, and on the other hand, the thickening agent of the fracturing fluid can be directly used for secondary thickening of the gel breaking flowback liquid of the guanidine gum and the polymer fracturing fluid to carry out sand-carrying fracturing, so that the problem of recycling the flowback waste liquid of other fracturing fluids is solved. The repeated cycle construction can reach 3 to 5 times. The fracturing fluid is suitable for fracturing a single well or a horizontal well of a low-permeability oil-gas reservoir.
Claims (6)
1. The MY-60 thickening agent for fracturing of the single well or the horizontal well of the hypotonic hydrocarbon reservoir is characterized by comprising the following components in percentage by mass: 25-30% of rosinyl sulfonate gemini surfactant, 18-24% of tetradecyl ammonium bromide or pentadecyl ammonium bromide or hexadecyl ammonium bromide, 8-12% of 6-tert-butyl o-cresol, 20-25% of isopropanol and 9-15% of clear water; wherein the molecular formula of the rosinyl sulfonate type gemini surfactant is as follows: NaO 3 SCH 2 CH 2 N(CH 2 R)(CH 2 CH 2 ) n N(CH 2 R)CH 2 CH 2 SO 3 Na and R are C 19 H 28 CONH 2 And n is an integer of 1 to 5.
2. A micromolecule recyclable fracturing fluid for fracturing of a single well or a horizontal well of a low-permeability hydrocarbon reservoir is characterized by comprising, by mass, 97-98% of clear water and 2-3% of the MY-60 thickening agent in claim 1; or consists of 97 to 98 percent by mass of potassium chloride solution and 2 to 3 percent of MY-60 thickener as in claim 1, wherein the concentration of the potassium chloride solution is 1 to 5 percent by mass.
3. The small molecule recyclable fracturing fluid of claim 2, wherein the fracturing fluid is at a temperature of 60 ℃ and a shear rate of 170S -1 Under the condition (1), the viscosity is more than 20 mPas.
4. The small molecule recyclable fracturing fluid of claim 2, characterized in that the MY-60 thickener is liquid and has a viscosity of less than 50 mPa-s at ambient temperature.
5. The use method of the small molecule recyclable fracturing fluid of any of claims 2-4, characterized by comprising the specific steps of:
the first step is as follows: passing a formulated amount of the MY-60 thickener of claim 1 to a sand blender truck;
the second step is that: then, introducing clear water or a potassium chloride solution with the formula amount of 1-5% in mass percentage into a sand mixing truck, and mixing the clear water or the potassium chloride solution with the formula amount of 1 in the sand mixing truck to form the small molecule recyclable fracturing fluid of any one of claims 2-4;
the third step: carrying out sand fracturing operation;
the fourth step: controlling open flow after the fracture is closed after the fracturing operation sand adding is finished;
the fifth step: the fracturing operation construction is finished;
and a sixth step: after the construction of the fracturing operation is finished, the waste liquid returned from the bottom of the well is collected again, and is discharged into a liquid storage tank for storage after sedimentation and sand removal;
the seventh step: when the next fracturing construction is carried out, the MY-60 thickening agent in the claim 1 is pumped into a sand mixing truck, then the flowback waste liquid stored in the liquid storage tank is introduced into the sand mixing truck and mixed with the MY-60 thickening agent in the claim 1 in the sand mixing truck to form the fracturing liquid for the second construction, wherein the MY-60 thickening agent in the claim 1 accounts for 2-3% by mass, and the flowback waste liquid accounts for 97-98% by mass; and repeating the steps from three to six, and repeating the cycle construction for no more than 5 times.
6. The method according to claim 5, wherein the viscosity of the fracturing fluid for the second fracturing work is returned to 20 mPas or more, and the next fracturing work is performed again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210701934.2A CN114874761A (en) | 2017-11-08 | 2017-11-08 | Small-molecule recyclable fracturing fluid and use method thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210701934.2A CN114874761A (en) | 2017-11-08 | 2017-11-08 | Small-molecule recyclable fracturing fluid and use method thereof |
| CN201711089655.0A CN107760295A (en) | 2017-11-08 | 2017-11-08 | A kind of small molecule is recycled fracturing fluid and its application method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201711089655.0A Division CN107760295A (en) | 2017-11-08 | 2017-11-08 | A kind of small molecule is recycled fracturing fluid and its application method |
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