CN115404056B - High-temperature-resistant modified humic acid cutting agent and preparation method and application thereof - Google Patents
High-temperature-resistant modified humic acid cutting agent and preparation method and application thereof Download PDFInfo
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 66
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical class C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000005520 cutting process Methods 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 63
- 238000005553 drilling Methods 0.000 claims abstract description 59
- 239000012530 fluid Substances 0.000 claims abstract description 51
- 239000003077 lignite Substances 0.000 claims abstract description 27
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 23
- 239000000243 solution Substances 0.000 claims abstract description 18
- 239000011259 mixed solution Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 12
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims description 8
- 150000003863 ammonium salts Chemical class 0.000 claims description 7
- 159000000000 sodium salts Chemical class 0.000 claims description 5
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 claims description 4
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 4
- WYYQVWLEPYFFLP-UHFFFAOYSA-K chromium(3+);triacetate Chemical compound [Cr+3].CC([O-])=O.CC([O-])=O.CC([O-])=O WYYQVWLEPYFFLP-UHFFFAOYSA-K 0.000 claims description 4
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 3
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 claims description 3
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 3
- 239000004246 zinc acetate Substances 0.000 claims description 3
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract description 28
- 239000004021 humic acid Substances 0.000 abstract description 14
- 238000004132 cross linking Methods 0.000 abstract description 5
- 229920002521 macromolecule Polymers 0.000 abstract description 5
- 239000004576 sand Substances 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 description 24
- 239000002002 slurry Substances 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 229910001868 water Inorganic materials 0.000 description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 6
- 230000032683 aging Effects 0.000 description 5
- 239000007795 chemical reaction product Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000000440 bentonite Substances 0.000 description 4
- 229910000278 bentonite Inorganic materials 0.000 description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 239000003223 protective agent Substances 0.000 description 3
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- SEPPVOUBHWNCAW-FNORWQNLSA-N (E)-4-oxonon-2-enal Chemical compound CCCCCC(=O)\C=C\C=O SEPPVOUBHWNCAW-FNORWQNLSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000006297 carbonyl amino group Chemical group [H]N([*:2])C([*:1])=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011814 protection agent Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 1
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000011701 zinc Substances 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/20—Natural organic compounds or derivatives thereof, e.g. polysaccharides or lignin derivatives
- C09K8/206—Derivatives of other natural products, e.g. cellulose, starch, sugars
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Fertilizers (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
The invention provides a preparation method of a high-temperature-resistant modified humic acid cutting agent, which comprises the following steps: mixing sodium hydroxide solution, lignite, grafting agent, cross-linking agent and the like to obtain mixed solution; and (3) reacting the mixed solution to obtain the high-temperature-resistant modified humic acid cutting agent. The lignite adopted by the invention has rich resources in China, humic acid is a natural organic macromolecular compound, and the humic acid, the grafting agent and the cross-linking agent are adopted for grafting and cross-linking, so that the temperature resistance of the humic acid can be further improved, and the lignite has good cutting capacity in dry hot rock drilling fluid under the ultra-high temperature condition, and the rock sand carrying capacity of the drilling fluid is effectively improved. The invention also provides a high-temperature-resistant modified humic acid cutting agent and application thereof.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling oilfield chemistry, and particularly relates to a high-temperature-resistant modified humic acid cutting agent, and a preparation method and application thereof.
Background
In recent years, with the increasing environmental protection requirements, the hot dry rock high-temperature geothermal resource with the advantages of green, continuous, stable, high utilization efficiency, rich resources and the like is getting more and more attention, and is expected to become an important component in the future energy pattern. The temperature of the hot reservoir of the high-temperature geothermal well of the dry hot rock is high, and the temperature of the bottom of the hole can reach 350 ℃ or even higher. The clay can generate high-temperature dispersion, high Wen Jujie and high-temperature passivation under the ultra-high temperature condition, the conventional treating agent can generate serious high-temperature degradation, and meanwhile, the treating agent can generate high-temperature desorption and high Wen Qushui on the surface of the clay, so that the high-temperature stability of drilling fluid is poor, and the rock carrying capacity at high temperature is poor. Therefore, the key to optimizing the high-temperature performance of the dry-hot rock drilling fluid is to solve the problem that the drilling fluid has poor high Wen Xieyan capability under the ultra-high temperature condition. The temperature resistance of the ultra-high temperature drilling fluid treating agent studied in China is not more than 270 ℃, the treating agent is easy to be seriously degraded under the ultra-high temperature condition, and the requirement of high-temperature drilling of dry hot rock cannot be met.
Disclosure of Invention
In view of the above, the invention aims to provide a high-temperature-resistant modified humic acid cutting agent, and a preparation method and application thereof.
The invention provides a preparation method of a high-temperature-resistant modified humic acid cutting agent, which comprises the following steps:
mixing sodium hydroxide solution, lignite, grafting agent and cross-linking agent to obtain mixed solution;
and (3) reacting the mixed solution to obtain the high-temperature-resistant modified humic acid cutting agent.
Preferably, the grafting agent is selected from one or more of hydrolyzed polyacrylonitrile ammonium salt, hydrolyzed polyacrylonitrile sodium salt, gamma-aminopropyl triethoxysilane and gamma-methacryloxypropyl trimethoxysilane.
Preferably, the crosslinking agent is selected from one of formaldehyde, potassium dichromate, sodium dichromate, chromium acetate, zinc acetate, zirconium chloride and ferric chloride.
Preferably, the mass concentration of the sodium hydroxide solution is 4.0-10%.
Preferably, the mass ratio of the sodium hydroxide solution to the lignite is (425-640): 100.
preferably, the mass ratio of the lignite to the grafting agent to the crosslinking agent is 100: (0-30): (0-30).
Preferably, the reaction is carried out under sealed conditions.
Preferably, the temperature of the reaction is 90-130 ℃.
Preferably, the reaction time is 4 to 12 hours.
The invention provides the high-temperature-resistant modified humic acid cutting agent prepared by the method.
The invention provides a drilling fluid, which comprises the following components: the high-temperature-resistant modified humic acid cutting agent is characterized by comprising a main component.
Humic acid has the characteristics of multiple benzene ring structures and strong temperature resistance, and is grafted and modified, so that the product has good high-temperature cutting and lifting capacity, is beneficial to improving the rock carrying capacity of drilling fluid under the ultra-high temperature condition, and has important significance for high-temperature drilling of dry hot rock and exploration and development of deep stratum oil gas resources.
The high-temperature-resistant modified humic acid cutting agent provided by the invention is formed by polymerizing lignite, grafting agent, cross-linking agent and the like, the process is easy to control, the operation is simple and feasible, the product has good cutting effect in ultra-high temperature drilling fluid, and the problems that the drilling fluid treatment agent is seriously degraded under ultra-high temperature conditions and has poor rock carrying capacity can be effectively solved.
The lignite adopted by the invention has rich resources in China, humic acid is a natural organic macromolecular compound, and the humic acid, the grafting agent and the cross-linking agent are adopted for grafting and cross-linking, so that the temperature resistance of the humic acid can be further improved, and the lignite has good cutting capacity in dry hot rock drilling fluid under the ultra-high temperature condition, and the rock sand carrying capacity of the drilling fluid is effectively improved.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other examples of modifications and alterations will be apparent to those skilled in the art based on the examples herein, and are intended to be within the scope of the invention. It should be understood that the embodiments of the present invention are only used for illustrating the technical effects of the present invention, and are not used for limiting the scope of the present invention. In the examples, the methods used are conventional methods unless otherwise specified.
The invention provides a preparation method of a high-temperature-resistant modified humic acid cutting agent, which comprises the following steps:
mixing sodium hydroxide solution, lignite, grafting agent and cross-linking agent to obtain mixed solution;
and (3) reacting the mixed solution to obtain the high-temperature-resistant modified humic acid cutting agent.
In the present invention, the sodium hydroxide solution is preferably an aqueous sodium hydroxide solution; the concentration of the sodium hydroxide solution by mass is preferably 4.0 to 10.0%, more preferably 4.0 to 9.1% or 4.2 to 1.0%, more preferably 5 to 9%, more preferably 6 to 8%, and most preferably 7%.
In the present invention, the grafting agent is preferably selected from the group consisting of hydrolyzed polyacrylonitrile ammonium salts NH 4 -one or more of HPAN, hydrolyzed polyacrylonitrile sodium salt Na-HPAN, gamma-aminopropyl triethoxysilane KH550 and gamma-methacryloxypropyl trimethoxysilane KH 570.
In the present invention, the crosslinking agent is preferably one selected from formaldehyde, potassium dichromate, sodium dichromate, chromium acetate, zinc acetate, zirconium chloride and ferric chloride.
In the invention, the mass ratio of the sodium hydroxide solution to the lignite is preferably (425-640): 100, more preferably (450 to 600): 100, more preferably (500 to 550): 100, most preferably (520 to 530): 100.
in the invention, the mass ratio of the lignite to the grafting agent to the crosslinking agent is preferably 100: (0-30): (0 to 30), more preferably 100: (5-25): (5 to 25), more preferably 100: (10-20): (10-20), most preferably 100:15:15.
in the present invention, the mixing is preferably performed under stirring. In the present invention, the method of mixing preferably comprises:
adding lignite into a sodium hydroxide solution, stirring and dissolving; adding grafting agent and cross-linking agent under stirring, and continuing stirring until a uniformly mixed solution is obtained.
In the present invention, the reaction is preferably carried out under sealed conditions; the temperature of the reaction is preferably 90 to 130 ℃, more preferably 100 to 120 ℃, most preferably 110 ℃; the reaction time is preferably 4 to 12 hours, more preferably 5 to 10 hours, and most preferably 6 to 8 hours.
In the present invention, the reaction preferably further comprises, after completion:
and drying and crushing the obtained reaction product to obtain the high-temperature-resistant modified humic acid cutting agent.
The invention provides the high-temperature-resistant modified humic acid cutting agent prepared by the method. In the invention, the high temperature resistant modified humic acid stripping and cutting agent preferably comprises a structural compound of formula I:
in the formula I, hm represents humic acid macromolecules, A represents grafting agent, and A may be A 1 、A 2 、A 3 ，A 1 ＝[CH 2 CH(CN)][CH 2 CH(COO)][CH 2 CH(CONH 2 )]、A 2 ＝NHCH 2 CH 2 CH 2 Si(OC 2 H 5 ) 3 、A 3 ＝CHC(CH 3 )COOC 3 H 6 Si(OCH 3 ) 3 ；
B represents a crosslinking agent, B may be B 1 、B 2 、B 3 、B 4 、B 5 ，B 1 ＝CH 2 、B 2 ＝Kr 3+ 、B 3 ＝Zn 2+ 、B 4 ＝Zr 4+ 、B 5 ＝Fe 3+ 。
The invention provides a drilling fluid, which comprises the following components: the high-temperature-resistant modified humic acid cutting agent is characterized by comprising a main component. The components of the drilling fluid are not particularly limited, and a person skilled in the art can select a drilling fluid with proper components according to the needs, and the high-temperature-resistant modified humic acid cutting agent in the technical scheme is added into the drilling fluid. In the present invention, the drilling fluid preferably includes:
a base slurry;
high temperature resistant modified humic acid cutting agent.
In the present invention, the base slurry is preferably a dry hot rock drilling fluid base slurry; the base slurry preferably comprises:
water, bentonite, sodium carbonate, a gum protecting agent (PAMS 601), sodium bisulfate, calcium carbonate and sodium hydroxide.
In the invention, the dosage ratio of bentonite to water in the base slurry is preferably (20-30) g:300mL, more preferably (22-28) g:300mL, more preferably (24-26) g:100mL, most preferably 24g:100mL; the ratio of sodium carbonate to water is preferably (1 to 1.5) g:300mL, more preferably (1.1 to 1.4) g:300mL, more preferably (1.2 to 1.3) g:300mL, most preferably 1.2g:300mL; the dosage ratio of the adhesive protecting agent to the water is preferably (0.8-1.2) g:300mL, more preferably (0.9 to 1.1) g:300mL, more preferably (0.9-1) g:300mL, most preferably 0.9g:300mL; the ratio of the calcium carbonate to the water is preferably (4-8) g:300mL, more preferably (5-7) g:300mL, most preferably 6g:300mL; the ratio of sodium bisulphite to water is preferably (1-2) g:300mL, more preferably (1.2 to 1.8) g:300mL, more preferably (1.4 to 1.6) g:300mL, most preferably 1.5g:300mL; the ratio of the sodium hydroxide to the water is preferably (1-2) g:300mL, more preferably (1.2 to 1.8) g:300mL, more preferably (1.4 to 1.6) g:300mL, most preferably 1.5g:300mL.
In the present invention, the density of the base slurry is preferably 1 to 1.5g/cm 3 More preferably 1.1 to 1.4g/cm 3 More preferably 1.1 to 1.2g/cm 3 Most preferably 1.1g/cm 3 。
In the present invention, the preparation method of the base slurry preferably includes:
and (3) adding bentonite and sodium carbonate into water, mixing, standing, and sequentially adding a gel protecting agent, calcium carbonate, sodium bisulphite and sodium hydroxide in a stirring state to obtain the dry-hot rock drilling fluid base slurry.
In the present invention, the mixing is preferably performed under stirring; the stirring speed is preferably 7500-8500 rm/min, more preferably 7800-8200 rm/min, and most preferably 800rm/min; the time for the standing is preferably 20 to 30 hours, more preferably 22 to 28 hours, still more preferably 24 to 26 hours, and most preferably 24 hours.
In the present invention, the stirring speed under the stirring condition is preferably 7500 to 8500rm/min, more preferably 7800 to 8200rm/min, and most preferably 8000rm/min.
In the invention, the mass of the high-temperature resistant modified humic acid stripping and slicing agent is preferably 6-10% of the mass of the base slurry, more preferably 7-9%, and most preferably 8%.
The preparation method of the drilling fluid is not particularly limited, and the raw materials are uniformly mixed by adopting the preparation method of the drilling fluid which is well known to the person skilled in the art. In the present invention, the method for preparing the drilling fluid preferably includes:
and adding the high-temperature resistant modified humic acid cutting agent into the base slurry, and uniformly stirring to obtain the drilling fluid.
In the present invention, the stirring speed is preferably 7500 to 8500rm/min, more preferably 7800 to 8200rm/min, and most preferably 8000rm/min.
The lignite adopted by the invention has rich resources in China, humic acid is a natural organic macromolecular compound, and the humic acid, the grafting agent and the cross-linking agent are adopted for grafting and cross-linking, so that the temperature resistance of the humic acid can be further improved, and the lignite has good cutting capacity in dry hot rock drilling fluid under the ultra-high temperature condition, and the rock sand carrying capacity of the drilling fluid is effectively improved.
The lignite used in the examples below was of Rankine origin, the hydrolyzed polyacrylonitrile ammonium salt was of Cangzhou Rong Cheng, the hydrolyzed polyacrylonitrile sodium salt was of Cangzhou Rong Cheng, the KH550 was of Guangzhou Zhongjie and the KH570 was of Guangzhou Zhongjie.
Example 1
Adding 600g of water into 25g of sodium hydroxide to prepare a solution (the concentration is 4.0%), adding 100g of lignite, stirring for dissolution, adding 15g of hydrolyzed polyacrylonitrile ammonium salt, 15g of hydrolyzed polyacrylonitrile sodium salt and 1.5g of potassium dichromate in proportion under stirring, continuously stirring until the mixed solution is uniformly mixed, loading the mixed solution into a reaction kettle, reacting for 8 hours at 90 ℃, drying and crushing the obtained reaction product, and obtaining the powdery high-temperature-resistant modified humic acid cutting agent HS-11.
Example 2
Adding 500g of water into 30g of sodium hydroxide to prepare a solution (the concentration is 5.7%), adding 100g of lignite, stirring for dissolution, adding 10g of hydrolyzed polyacrylonitrile ammonium salt, 10g of KH550, 10g of KH570 and 3g of sodium dichromate in proportion under stirring, continuously stirring until the mixed solution is uniformly mixed, loading the mixed solution into a reaction kettle, reacting for 6 hours at 130 ℃, drying and crushing the obtained reaction product, and obtaining the powdery high-temperature-resistant modified humic acid cutting agent HS-12.
Example 3
Adding 450g of water into 35g of sodium hydroxide to prepare a solution (the concentration is 7.2%), adding 100g of lignite, stirring for dissolution, adding 30g of hydrolyzed polyacrylonitrile ammonium salt and 15g of formaldehyde in proportion under stirring, continuously stirring until the mixed solution is uniformly mixed, filling the mixed solution into a reaction kettle, reacting for 4 hours at 120 ℃, drying and crushing the obtained reaction product to obtain the powdery high-temperature-resistant modified humic acid cutting agent HS-13.
Example 4
Adding 400g of water into 40g of sodium hydroxide to prepare a solution (the concentration is 9.1%), adding 100g of lignite, stirring for dissolution, adding 20g of KH550 and 3.0g of chromium acetate in proportion under stirring, continuously stirring until the mixed solution is uniformly mixed, loading the mixed solution into a reaction kettle, reacting for 12 hours at 100 ℃, drying and crushing the obtained reaction product to obtain the powdery high-temperature-resistant modified humic acid cutting agent HS-14.
Examples 5 to 17
Tables 1 and 2 show the addition amount of each raw material and the reaction conditions in the preparation process of the high temperature resistant modified humic acid cutting agent, and examples 5 to 17 were prepared according to the preparation methods.
Table 1 grafting agent, crosslinking agent and amounts thereof used in examples 5 to 12
Table 2 grafting agent, crosslinking agent and amounts thereof used in examples 13 to 17
Performance detection
The high temperature resistant modified humic acid stripping and cutting agent prepared in the example has the density of 1.1g/cm 3 The performance evaluation is carried out in dry-hot rock drilling fluid base slurry, and the preparation method of the base slurry comprises the following steps: 24g of bentonite (Xinjiang summer street soil) and 1.2g of sodium carbonate (Tianjin Yongda) are added into 300mL of water, uniformly stirred at 8000rm/min, and after standing for 24 hours, 0.9g of PAMS601 (a glue protection agent provided by China drilling institute), 6g of superfine calcium carbonate (Guangxi Jun, provided by Guangxi Jun), 1.5g of sodium bisulphite (provided by Tianjin Kong Europe) and 1.5g of NaOH (Tianjin Yongda) are sequentially added under the stirring state at 8000rm/min to obtain dry and hot rock drilling fluid base slurry.
The high temperature resistant modified humic acid stripping and cutting agents prepared in comparative example 1 (lignite) and examples 1-17 are respectively added into the drilling fluid base slurry, the addition amount is 8% of the mass of the drilling fluid base slurry, the drilling fluid base slurry is uniformly stirred at 8000rm/min, the dry hot rock drilling fluid is prepared, the dry hot rock drilling fluid is cooled and taken out after 300 ℃/2h rolling aging, and the drilling fluid is tested in part 1 according to GB/T16783.1-2012 "Petroleum and Natural gas industry drilling fluid field test: water-based drilling fluid 60 ℃ measurement of rheological property, filtrate reduction performance and medium-pressure filtrate loss FL (fluid loss control) API The rheological properties including apparent viscosity AV, molding viscosity PV, dynamic shear force YP and initial/final cut were measured and the results are shown in table 3.
Table 3 evaluation of the Properties of the high-temperature-resistant modified humic acid-containing cutting agent prepared in examples
As can be seen from the evaluation results in table 3, after high temperature aging, the drilling fluid using raw lignite in the dry hot rock drilling fluid has a dynamic shear force of 7.0Pa, a dynamic-plastic ratio of 0.27, and a primary final shear of 1.5/3.0; after the products synthesized by grafting and crosslinking are used in the examples 1-12, the dynamic shear force, the dynamic plastic ratio and the initial final shear of the drilling fluid are obviously increased, the dynamic shear force is more than 10.0Pa, the dynamic plastic ratio is more than 0.50, and the high-temperature-resistant modified humic acid cutting agent has obvious improvement effect on the rock carrying capacity of the dry hot rock drilling fluid. In the examples 13 to 17 of the products synthesized by grafting alone or using the cross-linking agent alone, the performance evaluation results in the drilling fluid show that the viscosity-cutting of the drilling fluid can be improved to a certain extent, the dynamic-plastic ratio can be increased to 0.25 to 0.40, and the filtration loss improvement is not obvious, and the cutting effect of the products synthesized by using the grafting agent and the cross-linking agent is slightly poorer than that of the products synthesized by using the grafting agent and the cross-linking agent simultaneously, so that the grafting agent and the cross-linking agent are required to be used simultaneously in the synthesis process of the high-temperature-resistant modified humic acid cutting agent, so that the products have better cutting capability.
Because the dry hot rock drilling has the particularity, the depth of the dry hot rock drilling is shallow, generally 3000-6000 m, the higher ground temperature can be obtained by more inland China around 3000-4000 m, and the cycle period of drilling fluid is shorter, so that the aging time of the early experiment is 2h, the aging time is prolonged to 4h to maximally meet the cycle period of the drilling fluid during drilling, the performance of the high-temperature resistant modified humic acid cutting agent in the drilling fluid is examined, and the test results are shown in Table 4.
TABLE 4 evaluation of the Properties of the high temperature resistant modified humic acid cutting agent prepared in example 3
As can be seen from the evaluation results in Table 4, the viscosity cut of the drilling fluid was slightly decreased with the increase of the aging time, and when the drilling fluid was aged at a high temperature of 300 ℃ C./4 h, the drilling fluid had AV=24.5 mPas, YP=8.5 Pa, dynamic plastic ratio was 0.53, FL API =16.0 mL, showing that the high temperature resistant modified humic acid cutting agent has good cutting capacity and high temperature stability, so that the drilling fluid can still keep higher after 300 ℃/4h high temperature agingThe viscosity-cutting, dynamic-plastic ratio and lower fluid loss can meet the requirements of high-temperature drilling of dry-hot rock.
The lignite adopted by the invention has rich resources in China, humic acid is a natural organic macromolecular compound, and the humic acid, the grafting agent and the cross-linking agent are adopted for grafting and cross-linking, so that the temperature resistance of the humic acid can be further improved, and the lignite has good cutting capacity in dry hot rock drilling fluid under the ultra-high temperature condition, and the rock sand carrying capacity of the drilling fluid is effectively improved.
While the invention has been described with respect to the preferred embodiments, it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (9)
1. A preparation method of a high-temperature-resistant modified humic acid cutting agent comprises the following steps:
mixing sodium hydroxide solution, lignite, grafting agent and cross-linking agent to obtain mixed solution;
reacting the mixed solution to obtain a high-temperature-resistant modified humic acid cutting agent; the grafting agent is one or more selected from hydrolyzed polyacrylonitrile ammonium salt, hydrolyzed polyacrylonitrile sodium salt, gamma-aminopropyl triethoxysilane and gamma-methacryloxypropyl trimethoxysilane.
2. The method of claim 1, wherein the cross-linking agent is selected from one of formaldehyde, potassium dichromate, sodium dichromate, chromium acetate, zinc acetate, zirconium chloride, and ferric chloride.
3. The method according to claim 1, characterized in that the sodium hydroxide solution has a mass concentration of 4.0-10%.
4. The method according to claim 1, characterized in that the mass ratio of sodium hydroxide solution to lignite is (425-640): 100.
5. the method according to claim 1, wherein the mass ratio of lignite, grafting agent and crosslinking agent is 100: (5-25): (5-25).
6. The method of claim 1, wherein the reaction is carried out under sealed conditions.
7. The method according to claim 1, wherein the temperature of the reaction is 90-130 ℃.
8. A high temperature resistant modified humic acid stripping and slicing agent prepared by the method of claim 1.
9. A drilling fluid comprising: the high temperature resistant modified humic acid stripping and cutting agent according to claim 8.
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| CN101230257A (en) * | 2007-12-28 | 2008-07-30 | 中国石油大学(华东) | Method for preparation of lignite resin drilling fluid loss additive |
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| CN112029486A (en) * | 2020-11-03 | 2020-12-04 | 胜利油田钻井飞龙泥浆技术服务有限公司 | Preparation method of environment-friendly degradable high-temperature-resistant salt-resistant anti-collapse filtrate reducer |
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| CN101230257A (en) * | 2007-12-28 | 2008-07-30 | 中国石油大学(华东) | Method for preparation of lignite resin drilling fluid loss additive |
| CN104194742A (en) * | 2014-08-12 | 2014-12-10 | 西安石油大学 | Multifunctional additive for oil-based drilling fluid and preparation method of multifunctional additive |
| CN105199059A (en) * | 2015-10-29 | 2015-12-30 | 中国地质大学（北京） | Chromium-free viscosity reducer for drilling fluid for oil field and preparation method of viscosity reducer |
| CN112029486A (en) * | 2020-11-03 | 2020-12-04 | 胜利油田钻井飞龙泥浆技术服务有限公司 | Preparation method of environment-friendly degradable high-temperature-resistant salt-resistant anti-collapse filtrate reducer |
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