CN111187608A - Enzyme seepage agent for improving guar gum fracturing fluid performance and application thereof - Google Patents
Enzyme seepage agent for improving guar gum fracturing fluid performance and application thereof Download PDFInfo
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- CN111187608A CN111187608A CN202010031491.1A CN202010031491A CN111187608A CN 111187608 A CN111187608 A CN 111187608A CN 202010031491 A CN202010031491 A CN 202010031491A CN 111187608 A CN111187608 A CN 111187608A
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- 102000004190 Enzymes Human genes 0.000 title claims abstract description 36
- 108090000790 Enzymes Proteins 0.000 title claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 33
- 239000012530 fluid Substances 0.000 title claims abstract description 33
- 229920002907 Guar gum Polymers 0.000 title claims abstract description 23
- 229960002154 guar gum Drugs 0.000 title claims abstract description 23
- 235000010417 guar gum Nutrition 0.000 title claims abstract description 23
- 239000000665 guar gum Substances 0.000 title claims abstract description 23
- 229940088598 enzyme Drugs 0.000 claims abstract description 35
- DCXYFEDJOCDNAF-REOHCLBHSA-N L-asparagine Chemical compound OC(=O)[C@@H](N)CC(N)=O DCXYFEDJOCDNAF-REOHCLBHSA-N 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 102100032487 Beta-mannosidase Human genes 0.000 claims abstract description 7
- CKLJMWTZIZZHCS-REOHCLBHSA-N L-aspartic acid Chemical compound OC(=O)[C@@H](N)CC(O)=O CKLJMWTZIZZHCS-REOHCLBHSA-N 0.000 claims abstract description 7
- 229960001230 asparagine Drugs 0.000 claims abstract description 7
- 235000003704 aspartic acid Nutrition 0.000 claims abstract description 7
- 108010055059 beta-Mannosidase Proteins 0.000 claims abstract description 7
- OQFSQFPPLPISGP-UHFFFAOYSA-N beta-carboxyaspartic acid Natural products OC(=O)C(N)C(C(O)=O)C(O)=O OQFSQFPPLPISGP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229940090805 clavulanate Drugs 0.000 claims abstract description 7
- OPGYRRGJRBEUFK-UHFFFAOYSA-L disodium;diacetate Chemical compound [Na+].[Na+].CC([O-])=O.CC([O-])=O OPGYRRGJRBEUFK-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000001632 sodium acetate Substances 0.000 claims abstract description 7
- 235000017454 sodium diacetate Nutrition 0.000 claims abstract description 7
- 108010059892 Cellulase Proteins 0.000 claims abstract description 5
- 108091005804 Peptidases Proteins 0.000 claims abstract description 5
- 239000004365 Protease Substances 0.000 claims abstract description 5
- 102100037486 Reverse transcriptase/ribonuclease H Human genes 0.000 claims abstract description 5
- 229940106157 cellulase Drugs 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 6
- 238000004132 cross linking Methods 0.000 claims description 5
- 239000003431 cross linking reagent Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 3
- 239000004971 Cross linker Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 15
- 230000009467 reduction Effects 0.000 description 13
- 239000003921 oil Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 9
- 239000010779 crude oil Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 230000005764 inhibitory process Effects 0.000 description 5
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 4
- 229920001938 Vegetable gum Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000002255 enzymatic effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002357 osmotic agent Substances 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium peroxydisulfate Substances [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000502 dialysis Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005213 imbibition Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000000065 osmolyte Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 101710178124 Endoglucanase 3 Proteins 0.000 description 1
- 101710178122 Endoglucanase 4 Proteins 0.000 description 1
- 101710180316 Protease 2 Proteins 0.000 description 1
- 101710180012 Protease 7 Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229940024606 amino acid Drugs 0.000 description 1
- 235000001014 amino acid Nutrition 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- VAZSKTXWXKYQJF-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)OOS([O-])=O VAZSKTXWXKYQJF-UHFFFAOYSA-N 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
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- 229920001059 synthetic polymer Polymers 0.000 description 1
- 238000005406 washing Methods 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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- 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
- C09K8/605—Compositions for stimulating production by acting on the underground formation containing biocides
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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
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—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
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- 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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- C09K8/905—Biopolymers
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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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Abstract
An enzyme seepage agent for improving the performance of guar gum fracturing fluid and application thereof are disclosed, wherein the enzyme seepage agent comprises, by mass, α -D-trehalose-6-clavulanate 5-10 parts, L-asparagine 5-7 parts, aspartic acid 5-10 parts, sodium diacetate 2-5 parts, protease 2-10 parts, mannase 5-10 parts, cellulase 3-5 parts, and water 43-73 parts, and the enzyme seepage agent is mixed and stirred for 30min-1h at normal temperature.
Description
Technical Field
The invention relates to a formula of fracturing fluid for fracturing a compact oil-gas layer and application thereof, in particular to an enzyme seepage agent for improving the performance of guar fracturing fluid and application thereof.
Background
For the development of low-permeability, ultra-low-permeability and compact oil-gas layers, the fracturing process is one of the most common and effective reconstruction measures. The fracturing process generally uses natural vegetable gum guar gum and a synthetic polymer to form a viscous solution of water, and the viscous solution becomes colloid to carry proppant (ceramsite sand) into an oil reservoir through crosslinking, so that the proppant can support a fracture, and oil and gas confined in the fracture can be released.
After the viscous colloidal substances carry the propping agent to enter an oil reservoir, gel breaking and thinning are carried out according to requirements, and the viscosity requirement is less than 5 mPa.s. But if the gel is not broken sufficiently, the residue will affect the flowback efficiency and consequently the seepage efficiency. Generally speaking, gel breaking problems are mainly focused on medium and low temperatures, such as the Ordos basin in our country, the temperature of some oil and gas reservoirs is only 25-30 ℃, the temperature of some coalbed methane water is even within 25 ℃, and if fracturing fluid measures are carried out in winter, the temperature of the prepared fracturing fluid is usually about 5 ℃. The conventional oxidation type gel breaker using ammonium persulfate, potassium persulfate and the like is a popular gel breaker technology, but under the low-temperature condition, the conventional oxidation type gel breaker does not have the condition of self-releasing oxidation gel breaking, can not release active oxygen, and has low efficiency at the temperature of less than 45 ℃. Some of the gel remains in the formation and affects flowback and seepage efficiency.
Therefore, some oil and gas fields are usually added with an activator on the basis, an oxidation gel breaker (APS) is added in the process, and then the activator is added in a wedge shape to form an A-B method to promote the release of gel breaking factors, so that low-temperature gel breaking is realized. However, the activation method is often an instant reaction, and since the wedge-shaped addition method is intermittent on site, it is difficult to accurately control the quantity and activation time, or the addition amount is small and the gel is not broken, or the addition amount is large and the instant gel breaking is performed, so that the pressure in the process of carrying the proppant by the fracturing fluid is suddenly high and suddenly low, the pumping fluctuation is caused, and part of the gel can remain in the stratum due to the uneven gel breaking. In addition, the vegetable gum guar gum for fracturing has water insoluble substances, so that a lot of residues appear after gum breaking.
With the development of the times, the development of compact oil is more and more emphasized, and how to induce oil flow becomes the central importance of the current development. Therefore, the guar fracturing technology needs to be optimized urgently.
Disclosure of Invention
Aiming at the defects of the existing guar fracturing technology, the invention aims to develop an enzyme seepage agent for improving the performance of guar fracturing fluid and application thereof, a small amount of the enzyme seepage agent is added into the fracturing fluid to fracture the compact oil gas, the existing fracturing fluid operation process is not changed, the effective gel breaking of the gel and the reduction of residues, stripping dispersion and dialysis displacement of crude oil are promoted through the mechanisms of 'complete gel breaking, residue elimination, stripping dispersion and dialysis displacement', the drainage and seepage assisting capability of the fracturing fluid is improved, the efficiency of the fracturing process is improved, the oil gas of the compact oil gas reservoir is fully released after fracturing, and the yield is increased.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an enzyme seepage agent for improving the performance of guar gum fracturing fluid is prepared by mixing and stirring α -D-trehalose-6-clavulanate 5-10 parts, L-asparagine 5-7 parts, aspartic acid 5-10 parts, sodium diacetate 2-5 parts, protease 2-10 parts, mannase 5-10 parts, cellulase 3-5 parts and water 43-73 parts at normal temperature for 30min-1 h.
The application of the enzyme seepage agent for improving the performance of the guar gum fracturing fluid comprises the following steps:
adding the prepared enzyme seepage agent on the basis of the original guar gum fracturing fluid; or adding the prepared enzyme seepage agent into a crosslinking tank and mixing with the crosslinking agent; pumping the mixture into a sand mixing truck, uniformly stirring the mixture, and injecting the mixture into a stratum, wherein the enzyme seepage agent comprises the following components in parts by mass: guar gum fracturing fluid or crosslinker ═ 0.025-0.05: 1.
the action mechanism of the invention is as follows:
the α -D-trehalose-6-clavulanate is an environment-friendly biological surfactant, has good seepage effect and oil stain cleaning effect, can enter a micropore throat where water molecules cannot enter, plays a role in seepage replacement and cleaning crude oil, and effectively improves the swept surface of the fracturing fluid.
The L-asparagine and the aspartic acid are amino acids, have good membrane protection and scale inhibition effects, can prevent the deposition of organic scale and inorganic scale, and prolong the effective period after fracturing construction.
The sodium diacetate is a safe and environment-friendly bactericide and can effectively eliminate bacterial putrefaction phenomenon generated by vegetable gum such as guar gum.
The protease, the mannase and the cellulase have good gel breaking effect on vegetable gums such as guar gum and the like, and can effectively eliminate plant residues.
The invention has the following properties:
the crude oil replacement rate is more than or equal to 60 percent;
the viscosity reduction rate is more than or equal to 95 percent;
the reduction rate of the residue content is more than or equal to 50 percent;
the scale inhibition rate is more than or equal to 90 percent;
the temperature application range is 0-120 ℃;
the pH is applicable in the range of 3-9.
The invention has the advantages that:
1. the gel breaking at the limit temperature is realized, the characteristic of low-temperature non-reaction of the conventional oxidant and enzyme is broken through, and the gel breaking at 0 ℃ is realized.
2. The process has wide application range: 0-200 ℃, pH: 3-11.
3. The gel breaking is mild, the curve is stable, the pressure fluctuation in the fracturing process can not be caused by adding the gel, and the construction process is stable and safe.
4. Reducing residue content by 30-60%.
5. Stripping the crude oil and dispersing and reducing viscosity. The oil washing rate is more than 95; the viscosity reduction rate is more than 98.
6. Fully replace crude oil in the micropore throat (the replacement rate of natural rock cores in 1mD is more than 90 percent), promote the drainage and seepage capability and improve the yield increasing efficiency.
7. Simple and safe operation, can be directly prepared in the cross-linking agent and is operated automatically.
8. It is easy to store and transport, 1-40 deg.C (the seepage agent can reach 60 deg.C), and can be placed in shady and ventilated place for a long period of more than 1 year.
9. The preparation is environment-friendly and safe, and all the used medicaments are safe neutral preparations and have no harm to the environment, people and livestock.
10. The economic benefit is good, and the input-output ratio can reach 1: 10.
11. the addition and application of the invention can improve the yield of the formed fracturing fluid by more than or equal to 20 percent.
Drawings
FIG. 1 shows the residue of the gel breaking solution before and after the addition of the enzyme penetrant of the present invention.
FIG. 2 shows the viscosity reduction before and after the addition of the enzymatic osmotic agent of the present invention.
FIG. 3 is a schematic representation of imbibition before and after addition of the enzymatic osmolyte of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example one
The enzyme seepage agent for improving the performance of guar gum fracturing fluid is prepared by the following substances, by weight, α -D-trehalose-6-clavulanate 5 parts, L-asparagine 5 parts, aspartic acid 5 parts, sodium diacetate 2 parts, protease 2 parts, mannase 5 parts, cellulase 3 parts and water 73 parts are respectively added into a stirring tank in proportion, and the mixture is stirred at normal temperature for 30min-1 h.
The prepared enzyme seepage agent can achieve the following indexes:
crude oil replacement rate: 62 percent;
viscosity reduction rate: 95 percent;
rate of reduction of residue content: 52 percent;
scale inhibition rate: 90 percent.
The application of the enzyme seepage agent for improving the performance of the guar gum fracturing fluid is realized by the following steps: 0.05 part of enzyme seepage agent is added on the basis of 1 part of the original guar gum fracturing fluid, and the guar gum fracturing fluid is pumped into a sand mixing truck, is uniformly stirred and is injected into a stratum.
The fracturing fluid formed by the above method is expected to increase production by 22%.
Example two
The enzyme seepage agent for improving the performance of the guar gum fracturing fluid is prepared by the following substances, by weight, 10 parts of α -D-trehalose-6-clavulanate, 7 parts of L-asparagine, 10 parts of aspartic acid, 5 parts of sodium diacetate, 10 parts of protease, 10 parts of mannase, 5 parts of cellulase and 43 parts of water are respectively added into a stirring tank in proportion, and the mixture is stirred at normal temperature for 30min-1 h.
The prepared enzyme seepage agent can achieve the following indexes:
crude oil replacement rate: 67%;
viscosity reduction rate: 98 percent;
rate of reduction of residue content: 55 percent;
scale inhibition rate: 92 percent.
The application of the enzyme seepage agent for improving the performance of the guar gum fracturing fluid is realized by the following steps: 0.025 parts of enzyme seepage agent is directly added into a crosslinking tank and mixed with 1 part of crosslinking agent, and then the mixture is pumped into a sand mixing truck and injected into the stratum after being uniformly stirred.
The fracturing fluid formed by the above method is expected to increase production by 25%.
EXAMPLE III
The enzyme seepage agent for improving the performance of the guar gum fracturing fluid comprises, by weight, α -D-trehalose-6-clavulanate 8 parts, L-asparagine 6 parts, aspartic acid 7 parts, sodium diacetate 3 parts, protease 7 parts, mannase 6 parts, cellulase 4 parts and water 60 parts which are respectively added into a stirring tank in proportion, and the mixture is stirred for 40min at normal temperature.
The prepared enzyme seepage agent can achieve the following indexes:
crude oil replacement rate: 70 percent;
viscosity reduction rate: 98 percent;
rate of reduction of residue content: 58 percent;
scale inhibition rate: 94 percent.
The application of the enzyme seepage agent for improving the performance of the guar gum fracturing fluid is realized by the following steps: 0.035 parts of enzyme seepage agent is directly added into the crosslinking tank to be mixed with 1 part of crosslinking agent, and then the mixture is pumped into a sand mixing truck to be evenly stirred and then is injected into the stratum.
The fracturing fluid formed by the above method is expected to increase production by 30%.
Referring to fig. 1, in order to show the residue of the gel breaking solution before and after the addition of the enzyme penetrant of the present invention, it can be seen from the figure that the residue is much reduced and almost little is seen by naked eyes; FIG. 2 is a graph showing the viscosity reduction before and after addition of the enzymatic osmolyte of the present invention, from which the viscosity reduction can be seen; FIG. 3 shows the situation of imbibition before and after the addition of the enzyme osmotic agent of the present invention, and it can be seen from the figure that the enzyme osmotic agent has a good osmotic effect.
Claims (2)
1. An enzyme seepage agent for improving the performance of guar gum fracturing fluid is characterized by comprising, by mass, 5-10 parts of α -D-trehalose-6-clavulanate, 5-7 parts of L-asparagine, 5-10 parts of aspartic acid, 2-5 parts of sodium diacetate, 2-10 parts of protease, 5-10 parts of mannase, 3-5 parts of cellulase and 43-73 parts of water, and the enzyme seepage agent is prepared by mixing and stirring at normal temperature for 30min-1 h.
2. The application of the enzyme seepage agent for improving the performance of the guar gum fracturing fluid, which is based on the claim 1, is characterized by comprising the following steps: adding the prepared enzyme seepage agent to the original guar gum fracturing fluid to form a mixture; or adding the prepared enzyme seepage agent into a cross-linking tank and mixing with a cross-linking agent to form a mixture; pumping the mixture into a sand mixing truck, uniformly stirring and injecting into a stratum; the enzyme seepage agent comprises the following components in parts by mass: guar gum fracturing fluid or crosslinker ═ 0.025-0.05: 1.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911140A (en) * | 2013-01-09 | 2014-07-09 | 中国石油化工股份有限公司 | Combined-type fracturing fluid bio-enzyme gel breaker and application method thereof |
| CN103980874A (en) * | 2014-05-07 | 2014-08-13 | 陕西省石油化工研究设计院 | Guar gum fracturing fluid breaker, and preparation method and application thereof |
| CN106147734A (en) * | 2016-07-14 | 2016-11-23 | 东营盛世石油科技有限责任公司 | A kind of green chelating increasing agent and its preparation method and application |
| CN106675547A (en) * | 2016-12-11 | 2017-05-17 | 孙祎 | Method for preparing gel breaker by utilizing modified carbon nano tube immobilized compound enzyme |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911140A (en) * | 2013-01-09 | 2014-07-09 | 中国石油化工股份有限公司 | Combined-type fracturing fluid bio-enzyme gel breaker and application method thereof |
| CN103980874A (en) * | 2014-05-07 | 2014-08-13 | 陕西省石油化工研究设计院 | Guar gum fracturing fluid breaker, and preparation method and application thereof |
| CN106147734A (en) * | 2016-07-14 | 2016-11-23 | 东营盛世石油科技有限责任公司 | A kind of green chelating increasing agent and its preparation method and application |
| CN106675547A (en) * | 2016-12-11 | 2017-05-17 | 孙祎 | Method for preparing gel breaker by utilizing modified carbon nano tube immobilized compound enzyme |
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Application publication date: 20200522 |