CN110591670B - Environment-friendly filtrate reducer for water-based drilling fluid, preparation method of filtrate reducer and drilling fluid - Google Patents
Environment-friendly filtrate reducer for water-based drilling fluid, preparation method of filtrate reducer and drilling fluid Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 103
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 239000012530 fluid Substances 0.000 title claims abstract description 99
- 239000000706 filtrate Substances 0.000 title claims abstract description 74
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 39
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 38
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 37
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 37
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims abstract description 28
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 26
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000178 monomer Substances 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 230000004048 modification Effects 0.000 claims abstract description 4
- 238000012986 modification Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 67
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 44
- 238000003756 stirring Methods 0.000 claims description 38
- 239000012153 distilled water Substances 0.000 claims description 31
- 238000005303 weighing Methods 0.000 claims description 29
- 239000003999 initiator Substances 0.000 claims description 28
- 239000007864 aqueous solution Substances 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 12
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 12
- 239000003153 chemical reaction reagent Substances 0.000 claims description 9
- 238000006011 modification reaction Methods 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000012263 liquid product Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000007334 copolymerization reaction Methods 0.000 claims description 2
- 238000010528 free radical solution polymerization reaction Methods 0.000 claims description 2
- 239000012065 filter cake Substances 0.000 abstract description 32
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 12
- 238000009826 distribution Methods 0.000 description 12
- 239000000047 product Substances 0.000 description 9
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- 238000012360 testing method Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 239000000440 bentonite Substances 0.000 description 5
- 229910000278 bentonite Inorganic materials 0.000 description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 5
- 239000004927 clay Substances 0.000 description 5
- 231100000252 nontoxic Toxicity 0.000 description 5
- 230000003000 nontoxic effect Effects 0.000 description 5
- 235000019198 oils Nutrition 0.000 description 5
- 239000008186 active pharmaceutical agent Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000013505 freshwater Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 2
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- 235000019476 oil-water mixture Nutrition 0.000 description 2
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
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- 238000000518 rheometry Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 231100000209 biodegradability test Toxicity 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
- C08F251/02—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof on to cellulose or derivatives thereof
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- 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
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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
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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Abstract
The invention provides an environment-friendly filtrate reducer for water-based drilling fluid, a preparation method thereof and the environment-friendly water-based drilling fluid, and solves the technical problems of poor filter cake quality and large filtrate loss caused by the application of the filtrate reducer in the prior art. The filtrate reducer is prepared by taking low-viscosity carboxymethyl cellulose as a raw material to perform graft modification, wherein the grafting monomers are acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and dimethyl diallyl ammonium chloride. By applying the filtrate reducer disclosed by the invention, the quality of a filter cake can be improved, and the filtrate loss is reduced; and has environmental protection and excellent temperature resistance.
Description
Technical Field
The invention relates to a filtrate reducer, and in particular relates to a filtrate reducer for an environment-friendly water-based drilling fluid, a preparation method of the filtrate reducer and the environment-friendly water-based drilling fluid.
Background
During the drilling process, due to the action of the pressure difference, the water in the drilling fluid is inevitably lost to the stratum through the well wall, so that the drilling fluid loses water. As water enters the formation, clay particles in the drilling fluid adhere to the wellbore wall to form a "filter cake," forming a filter cake wellbore. As the well wall of the filter cake is much denser than the original well wall, the filter cake prevents the drilling fluid from further losing water on one hand and plays a role in protecting the well wall on the other hand. However, in the process of forming a filter cake well wall, the filtered water content is too much, the filter cake is too thick, and fine clay particles enter the stratum along with the water content, so that normal drilling is affected and the stratum is damaged.
The loss of drilling fluid and the formation of filter cake the loss of drilling fluid is inevitable during drilling and filter cake can be formed by the loss of fluid to protect the well wall. However, the drilling fluid has too large filtration loss, which easily causes the shale to expand and collapse, resulting in the instability of the well wall. In addition, the filter cake thickens while the filtration loss is increased, so that the well diameter is reduced, a large torque is caused to a rotating drilling tool, swabbing and pressure fluctuation are caused when the drilling tool is tripped out, and differential pressure drill sticking is easily caused. Therefore, proper control of fluid loss is one of the important properties of a drilling fluid. It is clear that the fluid loss of a drilling fluid is closely related to the formation permeability. However, when the drilling fluid is lost, a filter cake is formed, and when the drilling fluid is lost again, the drilling fluid must pass through the formed filter cake. Thus, the main factor determining the magnitude of the fluid loss is the permeability of the filter cake. How to form a high quality filter cake with low permeability to prevent further loss of drilling fluid is one of the major issues to be considered in the formulation of drilling fluids.
In addition, the filtrate reducer is used as a first regulator of the drilling fluid performance, the environmental protection performance is also very important, most of the existing drilling fluid filtrate reducers have toxic groups, have biotoxicity, are not easy to degrade, can cause pollution to the environment, and simultaneously can also damage the quality of stratum and oil products,
in addition, fluid loss additives also need to have high temperature resistance.
The applicant has found that the prior art has at least the following technical problems:
1. in the filtrate reducer in the prior art, the quality of a filter cake is poor, and the filtrate loss is large;
2. the filtrate reducer in the prior art is mostly not environment-friendly, can pollute the environment and can also possibly damage the stratum and the quality of oil products;
3. most of filtrate reducers in the prior art have poor temperature resistance.
Disclosure of Invention
The invention aims to provide an environment-friendly filtrate reducer for water-based drilling fluid, a preparation method thereof and the environment-friendly water-based drilling fluid, so as to solve the technical problems of poor filter cake quality and large filtrate loss caused by the application of the filtrate reducer in the prior art. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an environment-friendly filtrate reducer for water-based drilling fluid, which is prepared by taking low-viscosity carboxymethyl cellulose as a raw material to perform graft modification, wherein the grafting monomers are acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and dimethyl diallyl ammonium chloride.
Optionally or preferably, an initiator is added in the graft modification reaction, and a solution polymerization method is adopted for graft copolymerization.
Alternatively or preferably, the initiator is ammonium persulfate.
Alternatively or preferably, the mass ratio of the acrylamide to the 2-acrylamido-2-methylpropanesulfonic acid to the dimethyldiallylammonium chloride is 5.5 to 6.5: 1.5-3: 0.5-1.5.
Alternatively or preferably, the graft modification reaction is carried out in an aqueous solution having a pH of from 6.5 to 7.5.
Alternatively or preferably, in the aqueous solution of the graft modification reaction, the total concentration of the graft monomer is 15 to 25 percent; the content of the low-viscosity carboxymethyl cellulose is 1.5-3%.
Alternatively or preferably, in the aqueous solution of the graft modification reaction, the amount of the initiator is 0.15 to 0.25 percent of the total mass of the graft monomer.
The invention provides a preparation method of a filtrate reducer for an environment-friendly water-based drilling fluid, which comprises the following steps:
(1) preparation of reagents:
weighing an initiator, dissolving the initiator in distilled water, and preparing an initiator solution; and dividing the initiator solution into two equal parts;
weighing 2-acrylamide-2-methylpropanesulfonic acid, dissolving the 2-acrylamide-2-methylpropanesulfonic acid in distilled water to prepare a 2-acrylamide-2-methylpropanesulfonic acid solution, and adjusting the pH value of the solution to 6.5-7.5;
weighing acrylamide and dimethyl diallyl ammonium chloride, dissolving in distilled water, and preparing an aqueous solution of the acrylamide and the dimethyl diallyl ammonium chloride;
(2) weighing distilled water and low-viscosity carboxymethyl cellulose, and adding the distilled water and the low-viscosity carboxymethyl cellulose into a reaction container; heating, controlling the temperature in the reaction vessel to be 30-40 ℃, and stirring;
(3) slowly adding low-viscosity carboxymethyl cellulose under the condition of stirring, and fully dissolving the low-viscosity carboxymethyl cellulose to form a uniform and transparent solution;
(4) continuing to heat up, and adding one part of the initiator solution prepared in the step (1) and the 2-acrylamide-2-methylpropanesulfonic acid solution prepared in the step (1) when the temperature in the reaction vessel reaches 65-75 ℃; keeping the temperature at 65-75 ℃, and reacting for 8-12 min;
(5) adding the other part of the initiator solution prepared in the step (1), keeping the temperature at 65-75 ℃, and reacting for 10-12 min;
(6) and (2) adding the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution prepared in the step (1), keeping the temperature at 65-75 ℃, and fully reacting for 2-4 h under constant-speed stirring to obtain a gel liquid product, namely the filtrate reducer for the environment-friendly water-based drilling fluid.
Optionally or preferably, in the step (1), the PH value is adjusted by using NaOH solution.
The invention provides an environment-friendly water-based drilling fluid, which comprises the filtrate reducer for the environment-friendly water-based drilling fluid.
The mechanism of persulfate initiation of low viscosity carboxymethyl cellulose in the present invention is: firstly persulfate generates-SO through pyrolysis4*；-SO4Reaction in water to produce OH radicals; OH radicals are used for abstracting-OH hydrogen atoms on the CMC molecular skeleton structure to form CMC-O primary radicals; then reacting with each grafting monomer. The specific reaction process is shown as the following formula:
S2O8 2-→2SO4 -＊
SO4 -*+H2O→H++SO4 2-+HO*
CMC-OH+HO*→CMC-O*+H2O
based on the technical scheme, the embodiment of the invention can at least produce the following technical effects:
(1) the environment-friendly filtrate reducer for the water-based drilling fluid provided by the invention is prepared by taking low-viscosity carboxymethyl cellulose as a raw material to perform graft modification, and an adsorption group and a cation rigid group are introduced, so that the stability of the filtrate reducer is enhanced, the quality of a filter cake can be effectively improved in application, and the filtrate loss is reduced; the environment-friendly oil-water mixture is nontoxic and degradable, meets the environment-friendly requirement, does not pollute the environment, and does not damage the stratum and the quality of oil products; in addition, the temperature resistance of the filtrate reducer for the environment-friendly water-based drilling fluid can reach about 160 ℃, the temperature resistance of a system added with the drilling fluid can also reach about 150 ℃, and the filtrate reducer has good temperature resistance.
(2) According to the preparation method of the filtrate reducer for the environment-friendly water-based drilling fluid, the prepared filtrate reducer for the environment-friendly water-based drilling fluid is prepared by grafting and modifying low-viscosity carboxymethyl cellulose serving as a raw material, and an adsorption group and a cation rigid group are introduced, so that the stability of the filtrate reducer is enhanced, the quality of a filter cake can be effectively improved in application, and the filtrate loss is reduced; the environment-friendly oil-water mixture is nontoxic and degradable, meets the environment-friendly requirement, does not pollute the environment, and does not damage the stratum and the quality of oil products; in addition, the temperature resistance of the filtrate reducer for the environment-friendly water-based drilling fluid can reach about 160 ℃, the temperature resistance of a system added with the drilling fluid can also reach about 150 ℃, and the filtrate reducer has good temperature resistance.
(3) The environment-friendly water-based drilling fluid provided by the invention has the advantages that as the components are added with the fluid loss additive for the environment-friendly water-based drilling fluid, the quality of a filter cake can be effectively improved and the fluid loss is reduced in application; the added filtrate reducer for the environment-friendly water-based drilling fluid is nontoxic and degradable, meets the environment-friendly requirement, does not pollute the environment, and does not damage the stratum and the quality of oil products; in addition, the temperature resistance of the filtrate reducer for the environment-friendly water-based drilling fluid can reach about 160 ℃, the temperature resistance of a system added with the drilling fluid can also reach about 150 ℃, and the filtrate reducer has good temperature resistance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a scanning electron microscope image of a low viscosity carboxymethylcellulose of the prior art;
FIG. 2 is a scanning electron microscope picture of the filtrate reducer for the environment-friendly water-based drilling fluid obtained in example 1 of the present invention;
FIG. 3 is a scanning electron micrograph of a filter cake in the comparative example;
FIG. 4 is a scanning electron micrograph of a filter cake obtained by using the environment-friendly water-based drilling fluid of example 5 of the present invention;
FIG. 5 is a graph showing the particle size distribution of a base slurry obtained by using the drilling fluid of the comparative example;
FIG. 6 is a plot of the particle size distribution of a base slurry obtained using the drilling fluid of example 5 of the present invention;
FIG. 7 is a graph of test results of the effect of aging temperature on API fluid loss.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Description of the reagents:
low viscosity carboxymethyl cellulose: tianjin chemical reagent plant, LV-CMC
The percentage concentration of the sodium hydroxide solution is 5%;
the dimethyl diallyl ammonium chloride adopts 60 percent of dimethyl diallyl ammonium chloride aqueous solution.
Example 1:
preparing the filtrate reducer for the environment-friendly water-based drilling fluid:
(1) preparation of reagents:
weighing 0.04g of ammonium persulfate, dissolving the ammonium persulfate in 5ml of distilled water, and preparing an ammonium persulfate solution; and dividing the initiator solution into two equal parts;
weighing 4g of 2-acrylamido-2-methylpropanesulfonic acid, dissolving the weighed 4g of 2-acrylamido-2-methylpropanesulfonic acid in 15ml of distilled water to prepare a 2-acrylamido-2-methylpropanesulfonic acid solution, and adjusting the pH value of the solution to 7.0 by using a sodium hydroxide solution;
③ weighing 12g of acrylamide and 3.3g of 60 percent dimethyl diallyl ammonium chloride aqueous solution, dissolving in 15ml of distilled water, and preparing the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution;
(2) weighing 80ml of distilled water, adding into a reaction container, heating to control the temperature in the reaction container to be 35 ℃, and stirring;
(3) slowly adding 2g of low-viscosity carboxymethyl cellulose under the condition that the stirring speed is 200r/min to fully dissolve the low-viscosity carboxymethyl cellulose to form a uniform and transparent solution;
(4) continuing to heat up, and adding one part of ammonium persulfate solution prepared in the step (1) and the 2-acrylamide-2-methylpropanesulfonic acid solution prepared in the step (1) when the temperature in the reaction container reaches 70 ℃; keeping the temperature at 70 ℃ and reacting for 10 min;
(5) adding the other part of ammonium persulfate solution prepared in the step (1), and reacting for 10min at the temperature of 70 ℃;
(6) and (2) adding the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution prepared in the step (1), keeping the temperature at 70 ℃, and fully reacting for 2.5 hours under constant stirring at a stirring speed of 200r/min to obtain a gel liquid product, namely the filtrate reducer for the environment-friendly water-based drilling fluid.
Example 2:
preparing the filtrate reducer for the environment-friendly water-based drilling fluid:
(1) preparation of reagents:
weighing 0.02g of ammonium persulfate, dissolving the ammonium persulfate in 5ml of distilled water, and preparing an ammonium persulfate solution; and dividing the initiator solution into two equal parts;
weighing 2g of 2-acrylamido-2-methylpropanesulfonic acid, dissolving the 2g of 2-acrylamido-2-methylpropanesulfonic acid in 8ml of distilled water to prepare a 2-acrylamido-2-methylpropanesulfonic acid solution, and adjusting the pH value of the solution to 6.5 by using a sodium hydroxide solution;
③ weighing 6g of acrylamide and 1.67g of 60 percent dimethyl diallyl ammonium chloride aqueous solution, dissolving in 8ml of distilled water, and preparing the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution;
(2) weighing 35ml of distilled water, adding into a reaction container, heating to control the temperature in the reaction container to be 35 ℃, and stirring; (ii) a
(3) Slowly adding 1g of low-viscosity carboxymethyl cellulose under the condition that the stirring speed is 200r/min, and stirring to fully dissolve the low-viscosity carboxymethyl cellulose to form a uniform and transparent solution;
(4) continuing to heat, and adding one part of ammonium persulfate solution prepared in the step (1) and the 2-acrylamide-2-methylpropanesulfonic acid solution prepared in the step (1) when the temperature in the reaction container reaches 75 ℃; keeping the temperature at 75 ℃ and reacting for 10 min;
(5) adding the other part of ammonium persulfate solution prepared in the step (1), keeping the temperature at 75 ℃, and reacting for 12 min;
(6) and (2) adding the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution prepared in the step (1), keeping the temperature at 75 ℃, and fully reacting for 4 hours under constant stirring at a stirring speed of 200r/min to obtain a gel liquid product, namely the filtrate reducer for the environment-friendly water-based drilling fluid.
Example 3:
preparing the filtrate reducer for the environment-friendly water-based drilling fluid:
(1) preparation of reagents:
weighing 0.04kg of ammonium persulfate, dissolving the ammonium persulfate in 5L of distilled water, and preparing an ammonium persulfate solution; and dividing the initiator solution into two equal parts;
weighing 4kg of 2-acrylamido-2-methylpropanesulfonic acid, dissolving the weighed 2-acrylamido-2-methylpropanesulfonic acid in 15L of distilled water to prepare a 2-acrylamido-2-methylpropanesulfonic acid solution, and adjusting the pH value of the solution to 7.5 by using a sodium hydroxide solution;
weighing 12kg of acrylamide and 1.67kg of 60% dimethyl diallyl ammonium chloride aqueous solution, dissolving in 15L of distilled water, and preparing the acrylamide and dimethyl diallyl ammonium chloride aqueous solution;
(2) weighing 80L of distilled water, adding into a reaction container, heating to control the temperature in the reaction container to 35 ℃, and stirring;
(3) slowly adding 2kg of low-viscosity carboxymethyl cellulose under the condition that the stirring speed is 200r/min, and stirring to fully dissolve the low-viscosity carboxymethyl cellulose to form a uniform and transparent solution;
(4) continuing to heat up, and adding one part of ammonium persulfate solution prepared in the step (1) and the 2-acrylamide-2-methylpropanesulfonic acid solution prepared in the step (1) when the temperature in the reaction container reaches 65 ℃; keeping the temperature at 65 ℃ and reacting for 12 min;
(5) adding the other part of ammonium persulfate solution prepared in the step (1), and reacting for 10min at the temperature of 65 ℃;
(6) and (2) adding the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution prepared in the step (1), keeping the temperature at 65 ℃, and fully reacting for 2 hours under constant stirring at a stirring speed of 200r/min to obtain a gel liquid product, namely the filtrate reducer for the environment-friendly water-based drilling fluid.
Example 4:
preparing the filtrate reducer for the environment-friendly water-based drilling fluid:
(1) preparation of reagents:
weighing 0.4kg of ammonium persulfate, dissolving the ammonium persulfate in 50L of distilled water, and preparing an ammonium persulfate solution; and dividing the initiator solution into two equal parts;
60kg of 2-acrylamide-2-methylpropanesulfonic acid is weighed and dissolved in 150L of distilled water to prepare a 2-acrylamide-2-methylpropanesulfonic acid solution, and the pH value of the solution is adjusted to 7.0 by a sodium hydroxide solution;
weighing 120kg of acrylamide and 33kg of 60% dimethyl diallyl ammonium chloride aqueous solution, dissolving in 150L of distilled water, and preparing the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution;
(2) weighing 800L of distilled water, adding into a reaction container, heating to control the temperature in the reaction container to 35 ℃, and stirring;
(3) slowly adding 20kg of low-viscosity carboxymethyl cellulose under the condition that the stirring speed is 200r/min, and stirring to fully dissolve the low-viscosity carboxymethyl cellulose to form a uniform and transparent solution;
(4) continuing to heat up, and adding one part of ammonium persulfate solution prepared in the step (1) and the 2-acrylamide-2-methylpropanesulfonic acid solution prepared in the step (1) when the temperature in the reaction container reaches 70 ℃; keeping the temperature at 70 ℃ and reacting for 10 min;
(5) adding the other part of ammonium persulfate solution prepared in the step (1), and reacting for 10min at the temperature of 70 ℃;
(6) and (2) adding the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution prepared in the step (1), keeping the temperature at 70 ℃, and fully reacting for 2.5 hours under constant stirring at a stirring speed of 200r/min to obtain a gel liquid product, namely the filtrate reducer for the environment-friendly water-based drilling fluid.
Example 5:
preparing the environment-friendly water-based drilling fluid:
the drilling fluid added with the filtrate reducer for the environment-friendly water-based drilling fluid prepared in the embodiment 1 of the invention is added according to the percentage concentration of 0.3-1%.
In the embodiment, the specific formula of the environment-friendly water-based drilling fluid is as follows: 1000mL of water, 40g of bentonite and 2g of Na2CO35g of the filtrate reducer for the environmentally friendly water-based drilling fluid prepared in example 1 (added at a percentage concentration of 0.5%).
The preparation method comprises the following steps: weighing 1000mL of fresh water, adding 40g of bentonite while stirring, and stirring for 10 min; then 2gNa was added2CO3Continuing stirring, pausing, scraping the bentonite at the edge by using a glass rod, and stirring for 30 min; then, 5g of the environment-friendly filtrate reducer for the water-based drilling fluid prepared in the example 1 is slowly added, and the mixture is stirred for 30 min; and covering a cup cover after stirring is finished, and maintaining for 24 hours at room temperature to obtain the environment-friendly water-based drilling fluid.
Comparative example:
1. applying low viscosity carboxymethyl cellulose;
2. the specific formula of the comparative drilling fluid is as follows: 1000mL of water, 40gBentonite, 2gNa2CO3。
The preparation method comprises the following steps: weighing 1000mL of fresh water, adding 40g of bentonite while stirring, and stirring for 10 min; then 2gNa was added2CO3Continuing stirring, pausing, scraping the bentonite at the edge by using a glass rod, and stirring for 30 min; and covering a cup cover after stirring is finished, and maintaining for 24 hours at room temperature to obtain the drilling fluid in the comparative example.
Experimental example:
firstly, filter cake quality and filtration loss:
1. scanning electron microscope experiments are carried out on the low-viscosity carboxymethyl cellulose in the comparative example 1 and the environment-friendly filtrate reducer for water-based drilling fluid obtained in the above example 1 (namely, a product obtained by grafting and modifying the low-viscosity carboxymethyl cellulose):
the scanning electron microscope experimental method comprises the following steps: the low-viscosity carboxymethyl cellulose and the environmentally-friendly fluid loss additive for water-based drilling fluid obtained in example 1 were prepared into solutions.
Scanning electron microscope experimental results: FIG. 1 shows a scanning electron microscope image of the low viscosity carboxymethylcellulose of comparative example 1; fig. 2 shows a scanning electron microscope picture of the filtrate reducer for an environment-friendly water-based drilling fluid obtained in example 1 of the present invention.
The scanning electron microscope experiment result shows that: the low-viscosity carboxymethyl cellulose aqueous solution is in a multilayer three-dimensional space net structure, the space is different in size, main stems and branches with different thicknesses are arranged in the net structure, and the surface of the low-viscosity carboxymethyl cellulose skeleton structure is smooth and is bent in a belt shape; compared with the scanning electron microscope picture of the low-viscosity carboxymethyl cellulose, the microstructure of the product after the low-viscosity carboxymethyl cellulose is grafted and modified is of a stacked sheet structure, the surface is smooth, gaps with different sizes are formed among sheets, and the whole distribution is uniform and compact. The difference between the two morphologies is obvious, and the distinguishing characteristics also indicate that the grafting reaction of the low-viscosity carboxymethyl cellulose has already occurred.
2. The drilling fluid of the comparative example 2 and the environment-friendly water-based drilling fluid obtained in the example 5 were used respectively, and two filter cakes obtained after filtration of the base slurry were subjected to a scanning electron microscope experiment:
scanning electron microscope experimental results: FIG. 3 is a scanning electron microscope image of a filter cake obtained by using the drilling fluid of the comparative example 2; FIG. 4 shows a SEM image of a filter cake obtained by using the drilling fluid in example 5 of the present invention.
The scanning electron microscope experiment result shows that: the filter cakes obtained after the base slurry is lost in the comparative example 2 are relatively loose in distribution, and partial pores exist among the filter cakes; the clay particles of the filter cake obtained by adding the low-viscosity carboxymethyl cellulose to the graft-modified product are arranged more compactly and have a smooth surface, which shows that the filtrate reducer has the function of improving the quality of the filter cake.
3. Particle size distribution experiments (testing with laser particle sizer):
particle size distribution test results: FIG. 5 is a graph showing the particle size distribution of a base slurry obtained by using the drilling fluid of comparative example 2; FIG. 6 is a graph showing the particle size distribution of the base slurry obtained from the drilling fluid of example 5 of the present invention.
The experimental results show that: after the filtrate reducer for the environment-friendly water-based drilling fluid in example 1 is added, the particle size distribution curve of the fresh water-based slurry is changed from a narrow single peak to a narrow and wide double peak, the particle size distribution curve is shifted to the left, and the distribution is wider. The molecular of the filtrate reducer for the environment-friendly water-based drilling fluid can effectively adsorb clay particles, so that the coalescence of partial clay particles is prevented, colloidal particles in the fresh water-based slurry become more, the particle size distribution is more uniform, fine particles can be fully filled in mud cake pores to form a compact filter cake, the permeability is reduced, and the filtrate reducer has the function of reducing the filtrate.
It can be seen from the three experiments described above: the filtrate reducer for the environment-friendly water-based drilling fluid effectively improves the quality of filter cakes and reduces the filtrate loss.
Secondly, temperature resistance:
1. the environmental-friendly water-based drilling fluid prepared in example 5 was subjected to aging temperature and rheological property tests, and the rheological property of the drilling fluid of the comparative example was measured (using a six-speed rotational viscometer) at the same time, and the test results are shown in table 1 below:
TABLE 1 Effect of drilling fluid aging temperature on rheology in example 5 and rheology of control drilling fluids
2. The environmental-friendly water-based drilling fluid prepared in example 5 was subjected to a test of the effect of aging temperature on API fluid loss (test using an API fluid loss tester):
test results of the effect of aging temperature on API fluid loss: as shown in fig. 7.
The analysis shows that: with the increase of the aging temperature, the drilling fluid filtration loss of the filtrate reducer for the environment-friendly water-based drilling fluid is increased, but the change is small.
Before hot rolling, the filtration loss of the environment-friendly water-based drilling fluid base slurry in the embodiment 5 of the invention is 8.3 mL; the paint still has good effect after being aged at 160 ℃, and the filtration loss is only 10.8 mL; when the filtrate reducer is aged at 180 ℃, the filtrate loss can be maintained to be about 14mL, and the comprehensive performance is stable, so that the synthesized environment-friendly filtrate reducer product for the water-based drilling fluid has good temperature resistance.
The single agent has a temperature resistance of about 160 ℃, and the temperature resistance of a drilling fluid system added into the drilling fluid system can also reach about 150 ℃.
Thirdly, environmental protection performance:
the filtrate reducer for the environment-friendly water-based drilling fluid prepared in the example 1 is used for heavy metal detection, biotoxicity detection and biodegradability detection according to the Chinese oil and gas enterprise standard Q/SY TZ 0111-2004, and the detection results are shown in the following tables 2, 3 and 4:
table 2 heavy metal test results
TABLE 3 results of biotoxicity assay
| Biotoxicity EC50(mg/L) | Toxicity grading |
| >3×105 | Is non-toxic |
TABLE 4 results of biodegradability test
| BOD5(mg/L) | CODCr(mg/L) | BOD5/CODCr(％) | Biodegradability |
| 170.70 | 549.74 | 31.05 | Easy to use |
The experimental result shows that the filtrate reducer for the environment-friendly water-based drilling fluid prepared in the example 1 has extremely low heavy metal content, is nontoxic, and has EC50Value greater than 30000, BOD5/CODCrThe value is more than 25, and the filtrate reducer is easy to biodegrade and is an environment-friendly filtrate reducer.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (5)
1. An environment-friendly filtrate reducer for water-based drilling fluid is characterized in that: the method takes low-viscosity carboxymethyl cellulose as a raw material to carry out graft modification, and the used grafting monomers are acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and dimethyl diallyl ammonium chloride;
adding an initiator in the grafting modification reaction, and performing graft copolymerization by adopting a solution polymerization method; the initiator is ammonium persulfate;
the mass ratio of the acrylamide to the 2-acrylamido-2-methylpropanesulfonic acid to the dimethyldiallylammonium chloride is 5.5-6.5: 1.5-3: 0.5-1.5;
in the aqueous solution of the graft modification reaction, the mass volume concentration of the graft monomer is 15-25%; the mass volume concentration of the low-viscosity carboxymethyl cellulose is 1.5-3%;
in the aqueous solution of the grafting modification reaction, the amount of the initiator is 0.15-0.25% of the total mass of the grafting monomer;
the preparation method of the filtrate reducer for the environment-friendly water-based drilling fluid comprises the following steps:
(1) preparation of reagents:
weighing an initiator, dissolving the initiator in distilled water, and preparing an initiator solution; and dividing the initiator solution into two equal parts;
weighing 2-acrylamide-2-methylpropanesulfonic acid, dissolving the 2-acrylamide-2-methylpropanesulfonic acid in distilled water to prepare a 2-acrylamide-2-methylpropanesulfonic acid solution, and adjusting the pH value of the solution to 6.5-7.5;
weighing acrylamide and dimethyl diallyl ammonium chloride, dissolving in distilled water, and preparing an aqueous solution of the acrylamide and the dimethyl diallyl ammonium chloride;
(2) weighing distilled water and adding the distilled water into a reaction container; heating, controlling the temperature in the reaction vessel to be 30-40 ℃, and stirring;
(3) slowly adding low-viscosity carboxymethyl cellulose under the condition of stirring, and fully dissolving the low-viscosity carboxymethyl cellulose to form a uniform and transparent solution;
(4) continuing to heat up, and adding one part of the initiator solution prepared in the step (1) and the 2-acrylamide-2-methylpropanesulfonic acid solution prepared in the step (1) when the temperature in the reaction vessel reaches 65-75 ℃; keeping the temperature at 65-75 ℃, and reacting for 8-12 min;
(5) adding the other part of the initiator solution prepared in the step (1), keeping the temperature at 65-75 ℃, and reacting for 10-12 min;
(6) and (2) adding the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution prepared in the step (1), keeping the temperature at 65-75 ℃, and fully reacting for 2-4 h under constant-speed stirring to obtain a gel liquid product, namely the filtrate reducer for the environment-friendly water-based drilling fluid.
2. The environment-friendly fluid loss additive for water-based drilling fluid as claimed in claim 1, wherein: the graft modification reaction is carried out in an aqueous solution having a pH of 6.5 to 7.5.
3. The preparation method of the fluid loss additive for the environment-friendly water-based drilling fluid according to any one of claims 1-2, characterized by comprising the following steps: the method comprises the following steps:
(1) preparation of reagents:
weighing an initiator, dissolving the initiator in distilled water, and preparing an initiator solution; and dividing the initiator solution into two equal parts;
weighing 2-acrylamide-2-methylpropanesulfonic acid, dissolving the 2-acrylamide-2-methylpropanesulfonic acid in distilled water to prepare a 2-acrylamide-2-methylpropanesulfonic acid solution, and adjusting the pH value of the solution to 6.5-7.5;
weighing acrylamide and dimethyl diallyl ammonium chloride, dissolving in distilled water, and preparing an aqueous solution of the acrylamide and the dimethyl diallyl ammonium chloride;
(2) weighing distilled water and adding the distilled water into a reaction container; heating, controlling the temperature in the reaction vessel to be 30-40 ℃, and stirring;
(3) slowly adding low-viscosity carboxymethyl cellulose under the condition of stirring, and fully dissolving the low-viscosity carboxymethyl cellulose to form a uniform and transparent solution;
(4) continuing to heat up, and adding one part of the initiator solution prepared in the step (1) and the 2-acrylamide-2-methylpropanesulfonic acid solution prepared in the step (1) when the temperature in the reaction vessel reaches 65-75 ℃; keeping the temperature at 65-75 ℃, and reacting for 8-12 min;
(5) adding the other part of the initiator solution prepared in the step (1), keeping the temperature at 65-75 ℃, and reacting for 10-12 min;
(6) and (2) adding the acrylamide and the dimethyl diallyl ammonium chloride aqueous solution prepared in the step (1), keeping the temperature at 65-75 ℃, and fully reacting for 2-4 h under constant-speed stirring to obtain a gel liquid product, namely the filtrate reducer for the environment-friendly water-based drilling fluid.
4. The preparation method of the filtrate reducer for the environment-friendly water-based drilling fluid according to claim 3, characterized by comprising the following steps: in the step (1) and the step (2), NaOH solution is used for adjusting the pH value.
5. An environment-friendly water-based drilling fluid is characterized in that: the components of the fluid loss additive comprise the environment-friendly fluid loss additive for water-based drilling fluid as defined in any one of claims 1-2.
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