CN114891489B - Non-sulfonated high-temperature-resistant water-based drilling fluid - Google Patents
Non-sulfonated high-temperature-resistant water-based drilling fluid Download PDFInfo
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- CN114891489B CN114891489B CN202210296951.2A CN202210296951A CN114891489B CN 114891489 B CN114891489 B CN 114891489B CN 202210296951 A CN202210296951 A CN 202210296951A CN 114891489 B CN114891489 B CN 114891489B
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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
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Abstract
The invention belongs to the technical field of oilfield chemistry in petroleum drilling engineering, and provides non-sulfonated high-temperature-resistant water-based drilling fluid. The non-sulfonated humic acid resin filtrate reducer has a unique molecular structure, and has the functions of dilution and filtrate reduction under the high-temperature condition; the polymer tackifying filtrate reducer is prepared from refractory high-temperature-resistant monomers (such as N-vinyl pyrrolidone and the like) and has excellent high-temperature resistance; sodium formate and potassium formate in the stable inhibitor are used as reducing agents, so that the stability of the drilling fluid can be improved; the sodium polyaspartate is a high molecular water-soluble polymer, has a dispersing and chelating effect, and can further improve the high temperature stability of the drilling fluid; all the three can improve the density of the aqueous solution, can improve the rheological property of the drilling fluid under the condition of high density, has the functions of reducing the solid phase content and dilution, has the strong functions of inhibiting the hydration dispersion and expansion of clay, and stabilizes the well wall. The drilling fluid disclosed by the invention does not contain sulfonated materials, and is safe and environment-friendly.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry in petroleum drilling engineering, in particular to non-sulfonated high-temperature-resistant water-based drilling fluid.
Background
Along with the great increase of the total energy consumption in China, energy supply has become an important bottleneck for restricting economic and social development, and energy safety is an important guarantee for national safety. Deep and ultra-deep oil and gas reservoirs are developed into the future, high-temperature deep well drilling operation is an important engineering guarantee for deep oil and gas field development, high-temperature resistance of a drilling fluid system is more and more challenged, and the existing drilling fluid technology mainly uses sulfonated materials as a main body to solve the stability and the fluid loss performance of the high-temperature drilling fluid under the high-temperature condition. The existing sulfonated materials comprise sulfonated lignite, sulfonated lignite resin, sulfonated phenolic resin, sulfonated tannin and synthetic copolymer containing sulfonic acid groups, but the sulfonated materials have high sulfur content, are toxic per se and poor in biodegradability, and are difficult to treat when being discarded.
With the increasing severity of environmental conditions, the use of sulphonated materials is limited. However, materials with environmental protection, such as starch and modified natural high molecular polymers, have the defect of poor temperature resistance. Thus, research into a non-sulfonated water-based drilling fluid is a development direction of water-based drilling fluids in the future.
Disclosure of Invention
In view of the above, the invention aims to provide a non-sulfonated high-temperature-resistant water-based drilling fluid. The water-based drilling fluid disclosed by the invention does not contain sulfonated substances and can resist high temperature.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a non-sulfonated high temperature resistant water-based drilling fluid, which comprises a base fluid, an inorganic suspending agent, an alkaline pH regulator, a polymer tackifying filtrate reducer, a non-sulfonated humic acid resin filtrate reducer, a stability inhibitor and a weighting agent;
the alkaline pH regulator comprises one or more of sodium hydroxide, magnesium oxide and magnesium hydroxide;
the polymer tackifying filtrate reducer is prepared from the following raw materials in parts by weight: 150-200 parts of water, 100-150 parts of 1, 4-dioxane, 10-15 parts of N-vinyl pyrrolidone, 25-30 parts of N, N-dimethyl acrylamide, 3-5 parts of 1- (4-hydroxyphenyl) ethanol, 0.5-1 part of N, N-methylene bisacrylamide, 1.5 parts of NaOH and K 2 HPO 4 2.6 parts of horseradish peroxidase, 0.2 part of acetylacetone, 0.4 part of hydrogen peroxide and 0.1 part of hydrogen peroxide;
the non-sulfonated humic acid resin filtrate reducer is prepared from the following raw materials in parts by weight; 100-150 parts of water, 60-80 parts of humic acid, 10-20 parts of formaldehyde, 10-30 parts of lignin, 20-40 parts of acrylic acid, 5-15 parts of gamma-methacryloxypropyl trimethoxy silane, 0.5-1 part of benzoyl peroxide, 20-30 parts of diamine and 1-2 parts of sodium methoxide;
the stabilizing inhibitors include one or more of sodium formate, potassium formate, and sodium polyaspartate.
Preferably, the base fluid comprises fresh water or sea water.
Preferably, the inorganic suspending agent comprises one or more of bentonite, attapulgite and sepiolite.
Preferably, the alkaline pH adjuster comprises one or more of sodium hydroxide, magnesium oxide and magnesium hydroxide.
Preferably, the mass concentration of the hydrogen peroxide is 10%.
Preferably, the diamine comprises one or more of hydroxyethylethylene diamine, ethylenediamine, propylenediamine, hexylenediamine, N-dimethyl-1, 2-ethylenediamine, N-dimethyl-1, 3-propylenediamine, and terminal polyetheramine.
Preferably, the weighting agent comprises barite.
Preferably, the inorganic suspending agent, the alkaline pH regulator, the polymer tackifying filtrate reducer, the non-sulfonated humic acid resin filtrate reducer, the stability inhibitor and the weighting agent account for the weight percentage of the base liquid respectively:
inorganic suspending agent: 1 to 3 percent;
pH regulator: 0.5 to 2 percent;
polymer tackifying filtrate reducer: 1 to 4 percent;
non-sulfonated humic acid resin filtrate loss reducer: 4-8%;
stabilizing inhibitors: 5-30%;
weighting agent: 100-300%.
Preferably, the density of the non-sulfonated high temperature resistant water-based drilling fluid is 1.7-2.4 g/cm 3 。
The invention providesThe non-sulfonated high temperature resistant water-based drilling fluid comprises a base fluid, an inorganic suspending agent, an alkaline pH regulator, a polymer tackifying filtrate reducer, a non-sulfonated humic acid resin filtrate reducer, a stability inhibitor and a weighting agent; the polymer tackifying filtrate reducer is prepared from the following raw materials in parts by weight: 150-200 parts of water, 100-150 parts of 1, 4-dioxane, 10-15 parts of N-vinyl pyrrolidone, 25-30 parts of N, N-dimethyl acrylamide, 3-5 parts of 1- (4-hydroxyphenyl) ethanol, 0.5-1 part of N, N-methylene bisacrylamide, 1.5 parts of NaOH and K 2 HPO 4 2.6 parts of horseradish peroxidase, 0.2 part of acetylacetone, 0.4 part of hydrogen peroxide and 0.1 part of hydrogen peroxide; the non-sulfonated humic acid resin filtrate reducer is prepared from the following raw materials in parts by weight; 100-150 parts of water, 60-80 parts of humic acid, 10-20 parts of formaldehyde, 10-30 parts of lignin, 20-40 parts of acrylic acid, 5-15 parts of gamma-methacryloxypropyl trimethoxy silane, 0.5-1 part of benzoyl peroxide, 20-30 parts of diamine and 1-2 parts of sodium methoxide; the stabilizing inhibitors include one or more of sodium formate, potassium formate, and sodium polyaspartate. The non-sulfonated humic acid resin filtrate reducer in the non-sulfonated high temperature resistant water-based drilling fluid has a unique molecular structure, and has the functions of dilution and filtration reduction under the high temperature condition. The polymer tackifying filtrate reducer is prepared from refractory high-temperature-resistant monomers (N-vinyl pyrrolidone, N-dimethylacrylamide, 1- (4-hydroxyphenyl) ethanol and N, N-methylenebisacrylamide), has excellent high-temperature resistance, and can enhance the synergistic effect of the polymer tackifying filtrate reducer and the non-sulfonated humic acid resin filtrate reducer. Sodium formate and potassium formate in the stable inhibitor are used as reducing agents, so that the stability of the drilling fluid can be improved; the sodium polyaspartate is a high molecular water-soluble polymer, has a dispersing and chelating effect, and can further improve the high temperature stability of the drilling fluid; the three substances in the stabilizing inhibitor can improve the density of the drilling fluid, can improve the rheological property of the drilling fluid under the condition of high density, has the functions of reducing the solid phase content and diluting, has the strong functions of inhibiting the hydration dispersion and expansion of clay, and stabilizes the well wall. The drilling fluid disclosed by the invention does not contain sulfonated materials, and is safe and environment-friendly.
Detailed Description
The invention provides a non-sulfonated high temperature resistant water-based drilling fluid, which comprises a base fluid, an inorganic suspending agent, an alkaline pH regulator, a polymer tackifying filtrate reducer, a non-sulfonated humic acid resin filtrate reducer, a stability inhibitor and a weighting agent;
the polymer tackifying filtrate reducer is prepared from the following raw materials in parts by weight: 150-200 parts of water, 100-150 parts of 1, 4-dioxane, 10-15 parts of N-vinyl pyrrolidone, 25-30 parts of N, N-dimethyl acrylamide, 3-5 parts of 1- (4-hydroxyphenyl) ethanol, 0.5-1 part of N, N-methylene bisacrylamide, 1.5 parts of NaOH and K 2 HPO 4 2.6 parts of horseradish peroxidase, 0.2 part of acetylacetone, 0.4 part of hydrogen peroxide and 0.1 part of hydrogen peroxide;
the non-sulfonated humic acid resin filtrate reducer is prepared from the following raw materials in parts by weight; 100-150 parts of water, 60-80 parts of humic acid, 10-20 parts of formaldehyde, 10-30 parts of lignin, 20-40 parts of acrylic acid, 5-15 parts of gamma-methacryloxypropyl trimethoxy silane, 0.5-1 part of benzoyl peroxide, 20-30 parts of diamine and 1-2 parts of sodium methoxide;
the stabilizing inhibitors include one or more of sodium formate, potassium formate, and sodium polyaspartate.
In the present invention, the raw materials used in the present invention are preferably commercially available products unless otherwise specified.
The non-sulfonated high temperature resistant water-based drilling fluid provided by the invention comprises a base fluid, and the base fluid preferably comprises fresh water or seawater.
The non-sulfonated high temperature resistant water-based drilling fluid provided by the invention comprises an inorganic suspending agent, wherein the inorganic suspending agent preferably comprises one or more of bentonite, attapulgite and sepiolite, and further preferably comprises bentonite and/or attapulgite, and further preferably comprises sodium bentonite, attapulgite, a mixture of sodium bentonite and attapulgite, and a mixture of sodium bentonite and lithium bentonite; the mass ratio of the sodium bentonite to the attapulgite in the sodium bentonite and attapulgite mixture is preferably 1:1, a step of; the mass ratio of the sodium bentonite to the lithium bentonite in the sodium bentonite and lithium bentonite mixture is preferably 1:1. in the present invention, the inorganic suspending agent is preferably 1 to 3% by weight, more preferably 1.5 to 2.5% by weight, and still more preferably 2% by weight of the base liquid. In the present invention, the particle size of the inorganic suspending agent is preferably 10 to 75. Mu.m.
The non-sulfonated high temperature resistant water-based drilling fluid provided by the invention comprises an alkaline pH regulator, wherein the alkaline pH regulator preferably comprises one or more of sodium hydroxide, magnesium oxide and magnesium hydroxide, and more preferably comprises a mixture of sodium hydroxide, magnesium oxide and magnesium hydroxide; the mass ratio of the sodium hydroxide, the magnesium oxide and the magnesium hydroxide in the mixture of the sodium hydroxide, the magnesium oxide and the magnesium hydroxide is preferably 10-40: 20-40: 20 to 70. In the present invention, the alkaline pH adjuster is preferably 0.5 to 2% by weight, more preferably 1 to 1.5% by weight, based on the base liquid. In the invention, the sodium hydroxide in the alkaline pH regulator provides basic alkaline conditions, and the magnesium oxide and the magnesium hydroxide have strong buffering capacity, so that the polymer chain breakage decomposition can be prevented at high temperature, and the stability of the drilling fluid material is improved.
The non-sulfonated high temperature resistant water-based drilling fluid provided by the invention comprises a polymer tackifying and fluid loss additive, wherein the polymer tackifying and fluid loss additive is prepared from the following raw materials in parts by weight: 150-200 parts of water, 100-150 parts of 1, 4-dioxane, 10-15 parts of N-vinyl pyrrolidone, 25-30 parts of N, N-dimethyl acrylamide, 3-5 parts of 1- (4-hydroxyphenyl) ethanol, 0.5-1 part of N, N-methylene bisacrylamide, 1.5 parts of NaOH and K 2 HPO 4 2.6 parts of horseradish peroxidase, 0.2 part of acetylacetone, 0.4 part of hydrogen peroxide and 0.1 part of hydrogen peroxide. In the present invention, the polymer viscosity-increasing and fluid loss additive preferably accounts for 1 to 4% by weight of the base fluid, more preferably 1.5 to 3.5% by weight, and still more preferably 2 to 3% by weight. In the invention, the raw materials for preparing the polymer tackifying filtrate reducer preferably comprise 150-200 parts by weight of water, more preferably 160-190 parts by weight, and even more preferably 170-180 parts by weight; the water preferably comprises deionized water. In the invention, the raw materials for preparing the polymer tackifying filtrate reducer preferably comprise 100-150 parts by weight of 1, 4-dioxane, more preferably 110-140 parts by weight, and even more preferably120-130 parts. In the present invention, the raw materials for preparing the polymer viscosity-increasing and fluid loss additive preferably comprise 10 to 15 parts by weight of N-vinyl pyrrolidone, more preferably 11 to 14 parts by weight, and even more preferably 12 to 13 parts by weight. In the present invention, the raw materials for preparing the polymer viscosity-increasing and fluid loss additive preferably comprise 25 to 30 parts by weight of N, N-dimethylacrylamide, more preferably 26 to 29 parts by weight, and even more preferably 27 to 28 parts by weight. In the present invention, the raw materials for preparing the polymer viscosity-increasing and fluid loss additive preferably comprise 3 to 5 parts by weight of 1- (4-hydroxyphenyl) ethanol, more preferably 3.5 to 4.5 parts by weight, and even more preferably 3 parts by weight. In the invention, the raw materials for preparing the polymer tackifying filtrate reducer preferably comprise 0.5 to 1 part by weight of
The N, N-methylenebisacrylamide of (2) is more preferably 0.6 to 0.9 part, still more preferably 0.7 to 0.8 part. In the invention, the raw materials for preparing the polymer tackifying filtrate reducer preferably comprise 1.5 parts by weight of NaOH. In the invention, the raw materials for preparing the polymer tackifying filtrate reducer preferably comprise 2.6 parts by weight of K 2 HPO 4 . In the invention, the raw materials for preparing the polymer viscosity-increasing filtrate reducer preferably comprise 0.2 part by weight of horseradish peroxidase. In the present invention, the raw materials for preparing the polymer viscosity-increasing and fluid loss additive preferably comprise 0.4 parts by weight of acetylacetone. In the invention, the raw materials for preparing the polymer tackifying filtrate reducer preferably comprise 0.1 part by weight of hydrogen peroxide; the mass concentration of the hydrogen peroxide is preferably 10%.
In the invention, the preparation method of the polymer tackifying filtrate reducer preferably comprises the following steps:
under the protective atmosphere, water, 1, 4-dioxane, N-vinyl pyrrolidone, N-dimethyl acrylamide, 1- (4-hydroxy benzene) ethanol, N-methylene bisacrylamide, naOH and K 2 HPO 4 And (3) under the action of horseradish peroxidase, acetylacetone and hydrogen peroxide, performing polymerization reaction to obtain the polymer tackifying filtrate reducer.
In the present invention, the polymerization reaction is preferably carried out at a temperature of 50 to 60℃for a time of 8 to 10 hours. In the present invention, the polymerization is preferably carried out under stirring.
In the present invention, under the protective atmosphere, water, 1, 4-dioxane, N-vinylpyrrolidone, N-dimethylacrylamide, 1- (4-hydroxyphenyl) ethanol, N-methylenebisacrylamide, naOH and K 2 HPO 4 Under the action of horseradish peroxidase, acetylacetone and hydrogen peroxide, the specific preferred polymerization reaction comprises: mixing water and 1, 4-dioxane to obtain a mixed solvent; mixing the mixed solvent, N-vinyl pyrrolidone (NVP), N-dimethylacrylamide, 1- (4-hydroxyphenyl) ethanol, N-Methylenebisacrylamide (MBA), naOH and K 2 HPO 4 Mixing, and continuing to introduce N 2 After 30min, adding peroxidase (HRP) and acetylacetone (ACAC), and heating to polymerization temperature to perform polymerization reaction; during the reaction, hydrogen peroxide (the mass concentration is 10%) is added by a syringe every 1h, and the adding times are 6 times. After the polymerization, the present invention preferably further comprises performing a post-treatment, preferably comprising: the mass ratio is 1:1, and then drying the resulting polymerization reaction feed solution at 80 ℃ to constant weight.
The non-sulfonated high temperature resistant water-based drilling fluid provided by the invention comprises a non-sulfonated humic acid resin filtrate reducer, wherein the non-sulfonated humic acid resin filtrate reducer is prepared from the following raw materials in parts by weight; 100-150 parts of water, 60-80 parts of humic acid, 10-20 parts of formaldehyde, 10-30 parts of lignin, 20-40 parts of acrylic acid, 5-15 parts of gamma-methacryloxypropyl trimethoxy silane, 0.5-1 part of benzoyl peroxide, 20-30 parts of diamine and 1-2 parts of sodium methoxide. In the present invention, the non-sulfonated humic acid resin filtrate reducer preferably accounts for 4 to 8% by weight of the base liquid, more preferably 5 to 7% by weight, and even more preferably 6% by weight. In the invention, the raw materials for preparing the non-sulfonated humic acid resin filtrate reducer preferably comprise 100-150 parts by weight of water, more preferably 110-140 parts by weight, and even more preferably 120-130 parts by weight; the water is preferably deionized water. In the invention, the raw materials for preparing the non-sulfonated humic acid resin filtrate reducer preferably comprise 60-80 parts by weight of humic acid, more preferably 65-75 parts by weight, and even more preferably 70 parts by weight; the humic acid preferably comprises one or more of black humic acid, yellow humic acid and biological humic acid, and further preferably is black humic acid, yellow humic acid, biological humic acid or black humic acid-yellow humic acid mixture; the mass ratio of the black humic acid to the fulvic acid in the black humic acid-fulvic acid mixture is preferably 1:1. in the invention, the raw materials for preparing the non-sulfonated humic acid resin filtrate reducer preferably comprise 10-20 parts by weight of formaldehyde, more preferably 12-18 parts by weight, and even more preferably 14-16 parts by weight. In the present invention, the raw material for preparing the non-sulfonated humic acid resin filtrate loss reducer preferably comprises 10 to 30 parts by weight of lignin, more preferably 15 to 25 parts by weight, and even more preferably 20 parts by weight. In the present invention, the raw material for preparing the non-sulfonated humic acid resin filtrate loss reducer preferably comprises 20 to 40 parts by weight of acrylic acid, more preferably 25 to 35 parts by weight, and even more preferably 30 parts by weight. In the invention, the raw materials for preparing the non-sulfonated humic acid resin filtrate reducer preferably comprise 5-15 parts by weight of gamma-methacryloxypropyl trimethoxysilane (KH 570), and more preferably 10 parts by weight. In the present invention, the raw material for preparing the non-sulfonated humic acid resin filtrate reducer preferably comprises 0.5 to 1 part by weight of benzoyl peroxide, more preferably 0.6 to 0.9 part by weight, and even more preferably 0.7 to 0.8 part by weight. In the invention, the raw materials for preparing the non-sulfonated humic acid resin filtrate reducer preferably comprise 20-30 parts by weight of diamine, more preferably 22-28 parts by weight, and even more preferably 24-26 parts by weight; the diamine preferably comprises one or more of hydroxyethyl ethylenediamine, propylenediamine, hexamethylenediamine, N-dimethyl-1, 2-ethylenediamine, N-dimethyl-1, 3-propylenediamine and end-group polyetheramine, more preferably N, N-dimethyl-1, 3-propylenediamine, ethylenediamine, end-group polyetheramine, hydroxyethyl ethylenediamine-end-group polyetheramine mixture, and the mass ratio of hydroxyethyl ethylenediamine to end-group polyetheramine in the hydroxyethyl ethylenediamine-end-group polyetheramine mixture is preferably 7:3, a step of; the terminal polyetheramine is preferably terminal polyetheramine D230. In the invention, the raw materials for preparing the non-sulfonated humic acid resin filtrate reducer preferably comprise 1-2 parts by weight of sodium methoxide, more preferably 1.2-1.8 parts by weight, and even more preferably 1.4-1.6 parts by weight. In the present invention, the raw material for preparing the non-sulfonated humic acid resin filtrate reducer preferably further comprises an alkaline pH regulator, and the alkaline pH regulator preferably comprises sodium hydroxide.
In the invention, the preparation method of the non-sulfonated humic acid resin filtrate reducer preferably comprises the following steps of:
mixing water, humic acid, formaldehyde and lignin, and performing polycondensation reaction to obtain a polycondensation reaction system;
under the protection atmosphere, the polycondensation reaction system, acrylic acid and gamma-methacryloxypropyl trimethoxy silane are subjected to graft copolymerization reaction under the action of benzoyl peroxide to obtain a graft copolymerization reaction system;
and mixing the graft copolymerization reaction system, diamine and sodium methoxide, and carrying out amidation reaction to obtain the non-sulfonated humic acid resin filtrate reducer.
The invention mixes water, humic acid, formaldehyde and lignin for polycondensation reaction to obtain a polycondensation reaction system. In the present invention, the pH value of the polycondensation reaction is preferably 7 to 8; the pH value of the polycondensation reaction is preferably achieved by adding an alkaline pH adjustor, and the addition amount of the alkaline pH adjustor is not particularly limited as long as the pH value of the polycondensation reaction can be made to be 7 to 8. In the present invention, the temperature of the polycondensation reaction is preferably 60 to 70 ℃, more preferably 62 to 68 ℃, still more preferably 64 to 66 ℃; the time is preferably 3 to 4 hours. In the present invention, the polycondensation reaction is preferably carried out under stirring. After the polycondensation reaction, the obtained polycondensation reaction feed liquid is used as a polycondensation reaction system to directly carry out subsequent reaction. In the invention, humic acid and lignin are subjected to polycondensation reaction under the action of formaldehyde to form macromolecules, so that the rigidity of the non-sulfonated humic acid resin filtrate reducer is improved.
After the polycondensation reaction system is obtained, under the protective atmosphere of the invention, the polycondensation reaction system, acrylic acid and gamma-methacryloxypropyl trimethoxy silane are reacted under the action of benzoyl peroxideAnd (3) carrying out graft copolymerization reaction to obtain a graft copolymerization reaction system. In the invention, the protective atmosphere preferably comprises nitrogen, and the purity of the nitrogen is preferably more than or equal to 99.9%. In the present invention, the protective atmosphere is preferably introduced into the polycondensation reaction system to remove oxygen in the polycondensation reaction system. In the invention, the flow rate of the protective atmosphere is preferably 3-5 m 3 Preferably at least 4.0m 3 And/h. In the present invention, the time for introducing the protective atmosphere is preferably 20 to 40 minutes, more preferably 30 minutes. In the present invention, the pH value of the graft copolymerization reaction is preferably 8 to 9, and the pH value of the graft copolymerization reaction is preferably achieved by adding an alkaline pH adjustor, and the addition amount of the alkaline pH adjustor is not particularly limited as long as the pH value of the graft copolymerization reaction can be made 8 to 9. In the present invention, the temperature of the graft copolymerization reaction is preferably 70 to 80 ℃, more preferably 72 to 78 ℃, still more preferably 74 to 76 ℃ and the time is preferably 5 to 6 hours. In the present invention, the graft copolymerization is preferably carried out under stirring. After the graft copolymerization reaction, the obtained graft copolymerization reaction feed liquid is used as a graft copolymerization reaction system to directly carry out subsequent reaction. In the invention, the macromolecule formed by polycondensation is connected with one end of gamma-methacryloxypropyl trimethoxy silane through hydroxyl, the other end of gamma-methacryloxypropyl trimethoxy silane is connected with acrylic acid, and the connection of acrylic acid improves the temperature resistance and water solubility of the non-sulfonated humic acid resin filtrate reducer.
After the graft copolymerization reaction system is obtained, the grafting copolymerization reaction system, diamine and sodium methoxide are mixed and amidation reaction is carried out, so that the non-sulfonated humic acid resin filtrate reducer is obtained. In the present invention, the temperature of the amidation reaction is preferably 150 to 170 ℃, more preferably 155 to 165 ℃, still more preferably 160 ℃; the time is preferably 6 to 8 hours. In the present invention, the amidation reaction is preferably performed under stirring. In the present invention, the amidation reaction is preferably carried out in an oven, and particularly preferably: mixing the obtained graft copolymerization reaction system, diamine and sodium methoxide, discharging to a tray, and placing the tray containing the raw materials into an oven for amidation reaction. In the present invention, the amidation reaction is preferably carried out simultaneously with drying. After the amidation reaction, the present invention preferably further comprises grinding the resulting amidation reaction product. The grinding parameters are not particularly limited, and the powder obtained by grinding can be sieved by a 120-mesh sieve. In the invention, diamine is connected to macromolecules through amide groups formed by reaction with acrylic acid in the amidation reaction process; meanwhile, the naked amino in the diamine improves the water solubility and the adsorption performance of the non-sulfonated humic acid resin filtrate reducer, and enhances the compatibility of other treating agents.
The non-sulfonated high temperature resistant water-based drilling fluid provided by the invention comprises a stability inhibitor, wherein the stability inhibitor comprises one or more of sodium formate, potassium formate and sodium polyaspartate, and is further preferably a mixture of sodium formate, potassium formate and sodium polyaspartate, and the mass ratio of the sodium formate, the potassium formate and the sodium polyaspartate in the mixture of sodium formate, potassium formate and sodium polyaspartate is preferably 10-30: 20-40: 30-70 parts. In the present invention, the stabilizing inhibitor is preferably 5 to 30% by weight, more preferably 10 to 25% by weight, and even more preferably 15 to 20% by weight of the base liquid. In the invention, sodium formate and potassium formate in the stable inhibitor are used as reducing agents, and sodium polyaspartate is a high molecular water-soluble polymer, and has the functions of dispersion, chelation and the like, and the three can improve the high temperature stability of the drilling fluid. The density of the aqueous solution can be improved, the rheological property of the drilling fluid under the high-density condition can be improved, the effects of reducing the solid phase content and the viscosity of the drilling fluid are achieved, the effects of inhibiting hydration dispersion and expansion of clay are achieved, and the stability of a well wall is facilitated.
The non-sulfonated high temperature resistant water-based drilling fluid provided by the invention comprises a weighting agent, and the weighting agent preferably comprises barite. In the present invention, the weight percentage of the barite in the base liquid is preferably 100-300%. In the present invention, the particle size of the weighting agent is preferably 40 to 60. Mu.m.
In the invention, the non-sulfonated high temperature resistant water-based drilling fluid has excellent densityIs selected to be 1.7-2.4 g/cm 3 . The preparation method of the non-sulfonated high-temperature-resistant water-based drilling fluid is not particularly limited, and the preparation method of the drilling fluid well known to those skilled in the art is adopted.
The non-sulfonated high temperature resistant water-based drilling fluids provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the invention.
Example 1
A non-sulfonated high temperature resistant water-based drilling fluid comprises fresh water, an inorganic suspending agent, a pH regulator, a polymer tackifying filtrate reducer, a non-sulfonated humic acid resin filtrate reducer, a stability inhibitor and a weighting agent;
the weight percentage of each component in fresh water is as follows:
inorganic suspending agent (sodium bentonite, particle size 10-75 μm): 3.0%;
pH adjuster (mixed by 20 parts by weight of sodium hydroxide, 40 parts by weight of magnesium oxide and 40 parts by weight of magnesium hydroxide): 0.5%;
polymer tackifying filtrate reducer: 4.0%;
non-sulfonated humic acid resin filtrate loss reducer: 4.0%;
stability inhibitor (mixed by 30 parts of sodium formate, 40 parts of potassium formate and 30 parts of sodium polyaspartate): 5.0%;
weighting agent (barite, particle size 40-60 μm): 100.0%;
the preparation method of the polymer tackifying filtrate reducer comprises the following steps: 200 parts by weight of water and 100 parts by weight of 1, 4-dioxane were added into a four-necked flask, and after stirring uniformly, 15 parts by weight of N-vinylpyrrolidone (NVP), 25 parts by weight of N, N-dimethylacrylamide, 3 parts by weight of 1- (4-hydroxyphenyl) ethanol, 0.5 part by weight of N, N-Methylenebisacrylamide (MBA) and 1.5 parts by weight of NaOH and 2.6 parts by weight of K were added 2 HPO 4 The reaction solution is a buffer solution with the pH value of 6.5, and N is continuously introduced 2 Adding 0.2 weight parts of horseradish peroxidase (HRP) and 0.4 weight parts of acetylacetone (ACAC) for 30min, and rapidly heating to 50deg.C for polymerization; during the polymerization, every 1 hour0.1 part by weight of H is introduced into a syringe 2 O 2 The solution (mass fraction is 10%) is added for 6 times and reacts for 8 hours under the condition of constant temperature stirring, so that a gelatinous reaction product is obtained, and the mass ratio is 1:1, washing the mixed solution of acetone and ethanol to remove unreacted reaction monomers, and drying the mixed solution to constant weight at 80 ℃ to obtain the polymer tackifying filtrate reducer.
The preparation method of the non-sulfonated humic acid resin filtrate reducer comprises the following steps: adding 100 parts by weight of water, 80 parts by weight of humic acid (specifically, black humic acid), 10 parts by weight of formaldehyde and 30 parts by weight of lignin into a four-neck flask, regulating the pH of the solution to 8 by using NaOH particles, heating to 70 ℃ for reaction for 3 hours, adding 20 parts by weight of acrylic acid and 15 parts by weight of gamma-methacryloxypropyl trimethoxysilane (KH 570) after the humic acid and the lignin are subjected to formaldehyde polycondensation, maintaining the pH of the solution to 8 by using NaOH particles, heating to 70 ℃ for reaction, introducing nitrogen for 30 minutes, adding 0.5 part by weight of initiator benzoyl peroxide, stirring at constant temperature for reaction for 5 hours, adding 20 parts by weight of diamine (end group polyether amine D230) and 1 part by weight of sodium methoxide after the grafting polymerization reaction is completed, placing the mixture into an oven at 170 ℃, drying the mixture in the same time of amidation reaction, removing solvent water and water generated in the reaction, improving the reaction yield, grinding the reaction product for 6 hours, and sieving the ground product by a 120-mesh sieve to obtain the non-sulfonated humic acid resin filtrate reducer.
The density of the non-sulfonated high temperature resistant water-based drilling fluid is 1.7g/cm 3 。
Example 2
A non-sulfonated high temperature resistant water-based drilling fluid comprises seawater, an inorganic suspending agent, a pH regulator, a polymer tackifying filtrate reducer, a non-sulfonated humic acid resin filtrate reducer, a stability inhibitor and a weighting agent;
the weight percentage of each component in the seawater is as follows:
inorganic suspending agent (attapulgite, particle size of 10-75 μm): 2.5%;
pH adjuster (mixed by 30 parts by weight of sodium hydroxide, 30 parts by weight of magnesium oxide and 40 parts by weight of magnesium hydroxide): 1.0%;
polymer tackifying filtrate reducer: 3.0%;
non-sulfonated humic acid resin filtrate loss reducer: 5.0%;
stability inhibitor (mixed by 10 weight parts of sodium formate, 20 weight parts of potassium formate and 70 weight parts of sodium polyaspartate): 30.0%;
weighting agent (barite, particle size 40-60 μm): 200.0%;
the polymer viscosity-increasing filtrate reducer was prepared from a four-necked flask equipped with a stirrer, reflux condenser, thermometer and nitrogen inlet and outlet tube. 150 parts by weight of water and 150 parts by weight of 1, 4-dioxane were added into a four-necked flask, and after stirring uniformly, 10 parts by weight of N-vinylpyrrolidone (NVP), 30 parts by weight of N, N-dimethylacrylamide, 5 parts by weight of 1- (4-hydroxyphenyl) ethanol, 1 part by weight of N, N-Methylenebisacrylamide (MBA) and 1.5 parts by weight of NaOH and 2.6 parts by weight of K were added 2 HPO 4 The reaction solution is a buffer solution with the pH value of 6.5, and N is continuously introduced 2 Adding 0.2 weight parts of horseradish peroxidase (HRP) and 0.4 weight parts of acetylacetone (ACAC) for 30min, and rapidly heating to 60deg.C; during the reaction, 0.1 parts by weight of H was added by syringe every 1 hour 2 O 2 The solution (mass fraction is 10%) is added for 6 times and reacts for 10 hours under the condition of constant temperature stirring, so that a gelatinous reaction product is obtained, and the mass ratio is 1:1, washing the mixed solution of acetone and ethanol to remove unreacted reaction monomers, and drying the mixed solution to constant weight at 80 ℃ to obtain the polymer tackifying filtrate reducer.
The non-sulfonated humic acid resin filtrate reducer is prepared by a four-mouth flask provided with a stirrer, a reflux condenser, a thermometer and a nitrogen inlet and outlet pipe, specifically, 150 parts by weight of water, 60 parts by weight of humic acid (humic acid), 20 parts by weight of formaldehyde and 10 parts by weight of lignin are firstly added into the four-mouth flask, naOH particles are used for adjusting the pH value of the solution to 7, the mixture is heated to 65 ℃ for 4 hours, 40 parts by weight of acrylic acid and 5 parts by weight of gamma-methacryloxypropyl trimethoxysilane (KH 570) are added after the humic acid and the lignin are subjected to formaldehyde polycondensation, naOH particles are used for maintaining the pH value of the solution to 9, the mixture is heated to 80 ℃ for reaction, nitrogen is introduced for 30 minutes, 1 part by weight of initiator benzoyl peroxide is added for constant temperature stirring reaction for 6 hours, 30 parts by weight of diamine (which is formed by mixing 50 parts by weight of hydroxyethyl ethylenediamine and 50 parts by weight of ethylenediamine) and 2 parts by weight of catalyst sodium methoxide are finally added after grafting polymerization reaction, the mixture is uniformly stirred, the mixture is placed in an oven at 150 ℃ for carrying out amidation reaction, drying is carried out, solvent water and water generated in the reaction is removed, the reaction is kept for 8 hours, and the product of the filtrate reducer is obtained after the filtrate reducer is obtained. The obtained non-sulfonated humic acid resin filtrate reducer has a unique molecular structure, and has the functions of dilution and filtrate reduction under the high-temperature condition.
The density of the non-sulfonated high-temperature high-density water-based drilling fluid is 2.0g/cm 3 。
Example 3:
a non-sulfonated high temperature resistant water-based drilling fluid comprises fresh water, an inorganic suspending agent, a pH regulator, a polymer tackifying filtrate reducer, a non-sulfonated humic acid resin filtrate reducer, a stability inhibitor and a weighting agent;
the weight percentage of each component in fresh water is as follows:
inorganic suspending agent (sodium bentonite and attapulgite are mixed according to the mass ratio of 1:1, and the particle size is 10-75 mu m): 2.0%;
pH adjuster (mixed by 40 parts by weight of sodium hydroxide, 40 parts by weight of magnesium oxide and 20 parts by weight of magnesium hydroxide): 2.0%;
polymer tackifying filtrate reducer: 2.0%;
non-sulfonated humic acid resin filtrate loss reducer: 7.0%;
stability inhibitor (mixed by 20 parts by weight of sodium formate, 30 parts by weight of potassium formate and 50 parts by weight of sodium polyaspartate): 20.0%;
weighting agent (barite, particle size 40-60 μm): 240.0%;
the polymer viscosity-increasing filtrate reducer was prepared from a four-necked flask equipped with a stirrer, reflux condenser, thermometer and nitrogen inlet and outlet tube. 180 parts by weight of water and 120 parts by weight of 1, 4-dioxane are added into a four-necked flask, and after being uniformly stirred, 12 parts by weight of N-vinyl pyrrolidone (NVP), 28 parts by weight of N, N-dimethyl acrylamide and 4 parts by weight of 1- (4-hydroxyphenyl) are respectively added) Ethanol, 0.8 part by weight of N, N-Methylenebisacrylamide (MBA), 1.5 parts by weight of NaOH and 2.6 parts by weight of K 2 HPO 4 The reaction solution is a buffer solution with the pH value of 6.5, and N is continuously introduced 2 Adding 0.2 weight parts of horseradish peroxidase (HRP) and 0.4 weight parts of acetylacetone (ACAC) for 30min, and rapidly heating to 60deg.C; during the reaction, 0.1 parts by weight of H was added by syringe every 1 hour 2 O 2 The solution (mass fraction is 10%) is added for 6 times and reacts for 9 hours under the condition of constant temperature stirring, so that a gelatinous reaction product is obtained, and the mass ratio is 1:1, washing the mixed solution of acetone and ethanol to remove unreacted reaction monomers, and drying the mixed solution to constant weight at 80 ℃ to obtain the polymer tackifying filtrate reducer.
The non-sulfonated humic acid resin filtrate reducer is prepared by a four-neck flask with a stirrer, a reflux condenser, a thermometer and a nitrogen inlet and outlet pipe, specifically, 120 parts by weight of water, 70 parts by weight of humic acid (humic acid), 15 parts by weight of formaldehyde and 20 parts by weight of lignin are firstly added into the four-neck flask, naOH particles are used for adjusting the pH value of the solution to 7, the solution is heated to 60 ℃ for reacting for 3.5 hours, 30 parts by weight of acrylic acid and 5 parts by weight of gamma-methacryloxypropyl trimethoxysilane (KH 570) are added after the humic acid and the lignin are subjected to formaldehyde polycondensation, naOH particles are used for maintaining the pH value of the solution to 8, the solution is heated to 75 ℃ for reacting for 30 minutes, 0.8 part by weight of initiator benzoyl peroxide is added, the solution is stirred at constant temperature for reacting for 6 hours, and finally 25 parts by weight of diamine (hydroxyethyl ethylenediamine) and 1.5 parts by weight of catalyst sodium methoxide are added after the grafting polymerization reaction is completed, the solution is placed into an oven at 160 ℃ for amidating reaction, drying is carried out at the same time, the solvent water and water generated in the reaction is removed, the reaction is milled for 7 hours, and the product of the filtrate reducer 120-phase is obtained. The obtained non-sulfonated humic acid resin filtrate reducer has a unique molecular structure, and has the functions of dilution and filtrate reduction under the high-temperature condition.
The density of the non-sulfonated high temperature resistant water-based drilling fluid is 2.2g/cm 3 。
Example 4:
a non-sulfonated high temperature resistant water-based drilling fluid comprises seawater, an inorganic suspending agent, a pH regulator, a polymer tackifying filtrate reducer, a non-sulfonated humic acid resin filtrate reducer, a stability inhibitor and a weighting agent;
the weight percentage of each component in the seawater is as follows:
inorganic suspending agent (sodium bentonite and lithium bentonite are mixed according to the mass ratio of 1:1, and the particle size is 10-75 mu m): 1.0%;
pH adjuster (mixed by 20 parts by weight of sodium hydroxide, 20 parts by weight of magnesium oxide and 60 parts by weight of magnesium hydroxide): 2.0%;
polymer tackifying filtrate reducer: 1.0%;
non-sulfonated humic acid resin filtrate loss reducer: 8.0%;
stability inhibitor (mixed by 30 parts by weight of sodium formate, 30 parts by weight of potassium formate and 40 parts by weight of sodium polyaspartate): 30.0%;
weighting agent (barite, particle size 40-60 μm): 300.0%;
the polymer viscosity-increasing filtrate reducer was prepared from a four-necked flask equipped with a stirrer, reflux condenser, thermometer and nitrogen inlet and outlet tube. 160 parts by weight of water and 140 parts by weight of 1, 4-dioxane were added into a four-necked flask, and after stirring uniformly, 12 parts by weight of N-vinylpyrrolidone (NVP), 28 parts by weight of N, N-dimethylacrylamide, 5 parts by weight of 1- (4-hydroxyphenyl) ethanol, 1 part by weight of N, N-Methylenebisacrylamide (MBA) and 1.5 parts by weight of NaOH and 2.6 parts by weight of K were added respectively 2 HPO 4 The reaction solution is a buffer solution with the pH value of 6.5, and N is continuously introduced 2 Adding 0.2 weight parts of horseradish peroxidase (HRP) and 0.4 weight parts of acetylacetone (ACAC) for 30min, and rapidly heating to 55deg.C; during the reaction, 0.1 parts by weight of H was added by syringe every 1 hour 2 O 2 Adding the solution (the mass fraction is 10%) for 6 times, reacting for 10 hours under the condition of constant temperature stirring to obtain a gelatinous reaction product, washing with a mixed solution of acetone and ethanol with the mass ratio of 1:1 to remove unreacted reaction monomers, and drying at 80 ℃ to constant weight to obtain the polymer tackifying filtrate reducer.
The non-sulfonated humic acid resin filtrate reducer is prepared by a four-mouth flask provided with a stirrer, a reflux condenser, a thermometer and a nitrogen inlet and outlet pipe, specifically, 150 parts by weight of water, 80 parts by weight of humic acid (humic acid), 10 parts by weight of formaldehyde and 10 parts by weight of lignin are firstly added into the four-mouth flask, naOH particles are used for adjusting the pH value of the solution to 8, the solution is heated to 70 ℃ for reacting for 4 hours, 40 parts by weight of acrylic acid and 10 parts by weight of gamma-methacryloxypropyl trimethoxysilane (KH 570) are added after the polycondensation of the humic acid and the lignin by formaldehyde, naOH particles are used for maintaining the pH value of the solution to 9, the solution is heated to 80 ℃ for reacting, nitrogen is introduced for 30 minutes, 1 part by weight of initiator benzoyl peroxide is added for reacting for 5.5 hours under constant temperature stirring, and finally 30 parts by weight of diamine (N, N-dimethyl-1, 3-propanediamine) and 1 part by weight of catalyst sodium methoxide are added after the graft polymerization reaction, the solution is uniformly stirred, the solution is placed in an oven at 170 ℃ for carrying out the amidation reaction, drying is carried out, the solvent water and the water generated in the reaction is removed, the reaction time is increased, the reaction yield is increased for 8 hours, and the filtrate reducer is obtained, namely the non-filtered resin filtrate reducer is obtained. The obtained non-sulfonated humic acid resin filtrate reducer has a unique molecular structure, and has the functions of dilution and filtrate reduction under the high-temperature condition.
The density of the non-sulfonated high temperature resistant water-based drilling fluid is 2.4g/cm 3 。
Comparative example:
polysulfonate drilling fluid: 3% sodium bentonite slurry +0.2% naoh +0.25% na 2 CO 3 +0.3% polyacrylamide+0.3% polyanionic cellulose+3% sulfonated phenolic resin+3% sulfonated lignite resin+3% sulfonated asphalt+6% potassium chloride+barite, density 2.0g/cm 3 。
Part 1 of the field test of drilling fluids for oil and gas industry according to GB/T16783.1-2014: the rheological properties and the fluid loss properties of the examples and the comparative examples were evaluated in water-based drilling fluids, and the results are shown in Table 1.
Table 1 results of performance testing of water-based drilling fluids
| Drilling fluid | ρ | T | Status of | AV | PV | YP | Φ3 | API | HTHP | Can open state |
| Example 1 | 1.70 | 180 | After aging for 24 hours | 36 | 26 | 10 | 8 | 3.0 | 11.2 | Uniformity of |
| Example 2 | 2.00 | 230 | After aging for 24 hours | 38 | 30 | 8 | 6 | 2.4 | 9.8 | Uniformity of |
| Example 3 | 2.20 | 220 | After aging for 24 hours | 42 | 36 | 6 | 5 | 3.2 | 10.6 | Uniformity of |
| Example 4 | 2.40 | 200 | After aging for 24 hours | 67 | 58 | 9 | 8 | 4.0 | 14.4 | Uniformity of |
| Comparative example | 2.00 | 180 | After aging for 24 hours | 56 | 47 | 9 | 4 | 6.2 | 22.4 | Uniformity of |
| Comparative example | 2.00 | 220 | After aging for 24 hours | 126 | 110 | 16 | 14 | — | — | Curing |
Note that: t: aging temperature of drilling fluid, and the temperature is lower than the temperature; ρ: density of drilling fluid, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the AV: apparent viscosity of drilling fluid, mPa.s; PV: plastic viscosity of drilling fluid, mPa.s; YP: drilling fluid cutting force Pa; Φ3: six-speed rotational viscometer 3-turn reading, dimensionless API: drilling fluid medium-pressure water loss (0.7 MPa, T,30 min), mL; HTHP: drilling fluid loses water at high temperature and high pressure (3.5 MPa, T,30 min) and mL.
As can be seen from table 1: the four groups of embodiments of the non-sulfonated high temperature resistant water-based drilling fluid disclosed by the invention have the advantages of uniform tank opening state, good flow state, good rheological property and low water loss at high temperature and high pressure after aging at different densities and different temperatures, and can resist the high temperature of 230 ℃; the polysulfonate drilling fluid has better performance at 180 ℃, but loses fluidity after aging after reaching 220 ℃.
The non-sulfonated high temperature resistant water-based drilling fluid of the present invention was subjected to anti-contamination properties as exemplified in example 3 to determine whether the drilling fluid would be affected by external contaminants, and the results are shown in table 2.
Table 2 evaluation of anti-fouling performance of non-sulfonated high temperature resistant water-based drilling fluids
| Drilling fluid | Pollution of | T | Status of | AV | PV | YP | Φ3 | API | HTHP | Can open state |
| Example 3 | Blank space | 220 | After aging for 24 hours | 42 | 36 | 6 | 5 | 3.2 | 10.6 | Uniformity of |
| Example 3 | 5% shale powder | 220 | After aging for 24 hours | 45 | 38 | 7 | 7 | 4.2 | 11.4 | Uniformity of |
| Example 3 | 10% shale powder | 220 | After aging for 24 hours | 51 | 42 | 9 | 8 | 4.4 | 12.0 | Uniformity of |
| Example 3 | 1% gypsum powder | 220 | After aging for 24 hours | 42 | 37 | 5 | 5 | 4.2 | 11.0 | Uniformity of |
| Example 3 | 1% calcium chloride powder | 220 | After aging for 24 hours | 40 | 25 | 5 | 5 | 4.4 | 11.8 | Uniformity of |
Note that: t: aging temperature of drilling fluid, and the temperature is lower than the temperature; ρ: density of drilling fluid, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the AV: apparent viscosity of drilling fluid, mPa.s; PV: plastic viscosity of drilling fluid, mPa.s; YP: drilling fluid cutting force Pa; Φ3: six-speed rotational viscometer 3-turn reading, dimensionless API: drilling fluid medium-pressure water loss (0.7 MPa, T,30 min), mL; HTHP: drilling fluid loses water at high temperature and high pressure (3.5 MPa, T,30 min) and mL.
As can be seen from table 2: the non-sulfonated high temperature resistant water-based drilling fluid has good anti-pollution performance, and after being polluted by shale powder, gypsum powder and calcium chloride powder, the drilling fluid is aged for 24 hours at 220 ℃, and has small rheological property, filtration performance and change, and basically tends to be stable.
The environmental protection performance of the non-sulfonated high temperature resistant water-based drilling fluid system is evaluated according to SY/T6788-2020 environmental protection technology evaluation requirement of Water-soluble oil field chemical agent, and the results are shown in Table 3. The sulfur content of the drilling fluid was measured according to the elemental analyzer measurement method of the carbon, hydrogen, nitrogen, sulfur content in SN/T3005-2011 organic chemicals, and the results are shown in table 3.
TABLE 3 environmental protection Performance test results for non-sulfonated high temperature resistant Water-based drilling fluids
| Drilling fluid | EC50 | HL |
| Example 1 | 80000 | 0 |
| Example 2 | 60000 | 0 |
| Example 3 | 75000 | 0 |
| Example 4 | 62000 | 0 |
Note that: EC50: biotoxicity by a luminescent bacterial method, and mg/L; HL: sulfur content,%.
As can be seen from table 3: the non-sulfonated high temperature resistant water-based drilling fluid meets the environmental protection requirement. And no sulfur element is present.
The foregoing is merely a preferred embodiment of the present invention and 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, which are intended to be comprehended within the scope of the present invention.
Claims (7)
1. A non-sulfonated high temperature resistant water-based drilling fluid, which is characterized by comprising the following components: the base liquid, an inorganic suspending agent, an alkaline pH regulator, a polymer tackifying filtrate reducer, a non-sulfonated humic acid resin filtrate reducer, a stabilization inhibitor and a weighting agent, wherein the weight percentages of the components in the base liquid are as follows:
inorganic suspending agent: 1-3%;
alkaline pH regulator: 0.5-2%;
polymer tackifying filtrate reducer: 1-4%;
non-sulfonated humic acid resin filtrate loss reducer: 4-8%;
stabilizing inhibitors: 5-30%;
weighting agent: 100-300%;
the polymer tackifying filtrate reducer is prepared from the following raw materials in parts by weight: 150-200 parts of water, 100-150 parts of 1, 4-dioxane, 10-15 parts of N-vinyl pyrrolidone, 25-30 parts of N, N-dimethylacrylamide, 3-5 parts of 1- (4-hydroxyphenyl) ethanol, 0.5-1 part of N, N-methylenebisacrylamide, 1.5 parts of NaOH and K 2 HPO 4 2.6 parts of horseradish peroxidase, 0.2 part of acetylacetone, 0.4 part of hydrogen peroxide and 0.1 part of hydrogen peroxide;
the preparation method of the polymer tackifying filtrate reducer comprises the following steps:
mixing water and 1, 4-dioxane to obtain a mixed solvent;
mixing the mixed solvent, N-vinyl pyrrolidone, N-dimethylacrylamide, 1- (4-hydroxy benzene) ethanol, N-methylene bisacrylamide, naOH and K 2 HPO 4 Mixing, and continuing to introduce N 2 30 After the reaction is carried out for min, horseradish peroxidase and acetylacetone are added, and the temperature is raised to the polymerization reaction temperature for polymerization reaction, thus obtaining the polymer tackifying filtrate reducer;
during the polymerization reaction, adding hydrogen peroxide with the mass concentration of 10% by using a syringe every 1: 1h for 6 times;
the temperature of the polymerization reaction is 50-60 ℃ and the time is 8-10 hours;
the non-sulfonated humic acid resin filtrate reducer is prepared from the following raw materials in parts by weight; 100-150 parts of water, 60-80 parts of humic acid, 10-20 parts of formaldehyde, 10-30 parts of lignin, 20-40 parts of acrylic acid, 5-15 parts of gamma-methacryloxypropyl trimethoxy silane, 0.5-1 part of benzoyl peroxide, 20-30 parts of diamine and 1-2 parts of sodium methoxide;
the preparation method of the non-sulfonated humic acid resin filtrate reducer comprises the following steps:
mixing water, humic acid, formaldehyde and lignin, and performing polycondensation reaction to obtain a polycondensation reaction system;
under the protection atmosphere, the polycondensation reaction system, acrylic acid and gamma-methacryloxypropyl trimethoxy silane are subjected to graft copolymerization reaction under the action of benzoyl peroxide to obtain a graft copolymerization reaction system;
mixing the graft copolymerization reaction system, diamine and sodium methoxide, and carrying out amidation reaction to obtain the non-sulfonated humic acid resin filtrate reducer;
the pH value of the polycondensation reaction is 7-8; the temperature of the polycondensation reaction is 60-70 ℃ and the time is 3-4 hours;
the pH value of the graft copolymerization reaction is 8-9; the temperature of the graft copolymerization reaction is 70-80 ℃ and the time is 5-6 h;
the temperature of the amidation reaction is 150-170 ℃ and the time is 6-8 h;
the stabilizing inhibitor is specifically sodium formate, potassium formate and sodium polyaspartate.
2. The non-sulfonated refractory water based drilling fluid according to claim 1, wherein said base fluid comprises fresh water or sea water.
3. The non-sulfonated high temperature resistant water based drilling fluid according to claim 1, wherein said inorganic suspending agents comprise one or more of bentonite, attapulgite and sepiolite.
4. The non-sulfonated refractory water based drilling fluid according to claim 1, wherein said alkaline pH adjusting agent is sodium hydroxide.
5. The non-sulfonated high temperature resistant water based drilling fluid according to claim 1, wherein said diamine comprises one or more of hydroxyethylethylene diamine, ethylenediamine, propylenediamine, hexamethylenediamine, N-dimethyl-1, 2-ethylenediamine, N-dimethyl-1, 3-propylenediamine and polyetheramine D230.
6. The non-sulfonated high temperature resistant water based drilling fluid according to claim 1, wherein said weighting agent comprises barite.
7. The non-sulfonated high temperature resistant water-based drilling fluid according to claim 1, wherein the density of the non-sulfonated high temperature resistant water-based drilling fluid is 1.7-2.4 g/cm 3 。
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