CN110551488B - Clay inhibitor for drilling fluid and preparation method thereof - Google Patents
Clay inhibitor for drilling fluid and preparation method thereof Download PDFInfo
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- CN110551488B CN110551488B CN201910960803.4A CN201910960803A CN110551488B CN 110551488 B CN110551488 B CN 110551488B CN 201910960803 A CN201910960803 A CN 201910960803A CN 110551488 B CN110551488 B CN 110551488B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Abstract
The invention discloses a clay inhibitor for drilling fluid and a preparation method thereof, wherein the clay inhibitor is prepared from the following raw materials in parts by weight: 40-80 parts of nano-aluminum hydroxide, 30-60 parts of inorganic salt, 70-120 parts of polyacrylamide, 5-10 parts of ferrous chloride or ferrous sulfate, 50-100 parts of sulfonated nitro humic acid, 20-50 parts of lignosulfonate and 8-15 parts of potassium chlorate; the preparation method comprises the following steps: mixing and stirring sulfonated nitrohumic acid, lignosulfonate, potassium chlorate and ferrous chloride or ferrous sulfate, reacting for 1-1.5h at 80-100 ℃, adjusting the temperature to 35-40 ℃, adjusting the pH value to 9-11, sequentially adding nano aluminum hydroxide and inorganic salt, stirring for 20-30min, adding polyacrylamide, and stirring for 2-3h at 50-60 ℃ to obtain the inhibitor for clay. The clay inhibitor prepared by the method can be suitable for water-based drilling fluid, has strong capability of inhibiting hydration and expansion of clay, and can relieve the phenomenon of borehole wall instability.
Description
Technical Field
The invention relates to the technical field of additives for drilling fluid, in particular to a clay inhibitor for drilling fluid and a preparation method thereof.
Background
In the process of oil and gas drilling, the worldwide problem of instability of the wall of a shale stratum well is always puzzled by the technical personnel of petroleum engineering. Well collapse and hole shrinkage caused by instability of the well wall can not only cause downhole complexity such as well tripping and encountering resistance, drill jamming, torque increase, pump holding and the like, but also cause dropping of a drilling tool, deviation of the well track or scrapping of the whole well.
Along with the increasing of the exploration and development of shale gas resources in the countries in recent years, the problem of well wall stability faces more severe challenges. Although the oil-based drilling fluid is generally used for shale gas drilling to relieve the borehole wall instability phenomenon at present, from the viewpoint of economic development benefit and environmental protection, a high-performance water-based drilling fluid with strong inhibition and excellent environmental protection property is bound to become a development direction in the future. The research and development of the shale inhibitor as a core treating agent of the inhibitive water-based drilling fluid is always the research focus in the field of the drilling fluid, so that the clay inhibitor which has excellent capability of inhibiting the hydration swelling of clay and can relieve the stability of the well wall is the research focus in the field of the drilling fluid.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide a clay inhibitor for drilling fluid, which has the advantages of strong inhibition of clay hydration swelling capacity and capability of relieving borehole wall instability.
The second purpose of the invention is to provide a preparation method of the clay inhibitor for the drilling fluid, which has the advantages that the prepared clay inhibitor can be suitable for water-based drilling fluid, has strong capability of inhibiting hydration and expansion of clay, and can relieve the phenomenon of borehole wall instability.
In order to achieve the first object, the invention provides the following technical scheme: the clay inhibitor for the drilling fluid is prepared from the following raw materials in parts by weight: 40-80 parts of nano-aluminum hydroxide, 30-60 parts of inorganic salt, 70-120 parts of polyacrylamide, 5-10 parts of ferrous chloride or ferrous sulfate, 50-100 parts of sulfonated nitro humic acid, 20-50 parts of lignosulfonate and 8-15 parts of potassium chlorate.
By adopting the technical scheme, the inorganic salt has stronger capability of inhibiting shale from permeating and hydrating, plays a role in inhibiting hydration and expansion of clay, is used by being compounded with polyacrylamide, and has stronger hydration and expansion inhibition performance; the nanometer hydroxyl aluminum dissociates multi-core hydroxyl bridged ions under certain conditions, the formed complex ions have very high positive charges and are similar to clay minerals in structure, so the nanometer hydroxyl aluminum can be tightly adsorbed on the surfaces of clay particles with certain electronegativity under the action of electrostatic attraction, the action of a protective film is played to control hydration expansion, in addition, the nanometer hydroxyl aluminum and polyacrylamide share the same purpose, the polyacrylamide can be captured through an adsorption bridge network of chain molecules of the polyacrylamide, so that the clay minerals can be more stably adsorbed and fixed on the nanometer hydroxyl aluminum, the effect of preventing clay particles from migrating is played, and the effect of inhibiting the hydration expansion of the clay can be played.
In addition, the sulfonated nitrohumic acid contains a large amount of carbonyl, alcoholic hydroxyl, phenolic hydroxyl, nitro and sulfonic acid groups, the lignosulfonate contains a large amount of carboxyl, carbonyl, alcoholic hydroxyl, phenolic hydroxyl and sulfonic acid groups, the curled macromolecules can easily generate stable chelate and complex with ferrous ions, and the complexed sulfonated nitrohumic acid and lignosulfonate chelate and complex have negative charges and can be firmly adsorbed on clay particles, so that the effect of inhibiting the hydration expansion of the clay is achieved, the rheological property of the drilling fluid is improved, and the viscosity is reduced; the potassium chlorate in the invention can not only play a role of an oxidant for the complexation of the sulfonated nitrohumic acid and the lignosulfonate, but also play a role of inhibiting the hydration expansion of the clay by potassium ions in the potassium chlorate.
The clay inhibitor obtained by compounding the mixture of the nano-aluminum hydroxide, the polyacrylamide, the inorganic salt, the sulfonated nitro humic acid and the lignosulfonate complex has a strong inhibiting effect on hydration expansion of clay, so that the clay inhibitor plays an important role in stabilizing a well wall, can reduce collapse of the well wall and various troubles caused by collapse particularly for a shale bottom layer with high clay content, well improves the rheological property of the drilling fluid due to the clay inhibiting capability of the clay inhibitor in the drilling fluid, reduces the dynamic shear force, reduces the viscosity, reduces the power loss of a drilling fluid pump, can improve the drilling speed, and particularly has little influence on the drainability of the drilling fluid when being used in a high-temperature environment of 200-250 ℃ compared with the existing clay inhibitor, and has good salt resistance and temperature resistance when being used in a high-temperature environment of 200-250 ℃, the product will not decompose and lose its inhibitory function.
The invention is further configured to: the clay inhibitor is prepared from the following raw materials in parts by weight: 55-65 parts of nano-aluminum hydroxide, 40-50 parts of inorganic salt, 85-105 parts of polyacrylamide, 6-9 parts of ferrous chloride or ferrous sulfate, 70-80 parts of sulfonated nitro humic acid, 30-40 parts of lignosulfonate and 10-13 parts of potassium chlorate.
The invention is further configured to: the clay inhibitor is prepared from the following raw materials in parts by weight: 60 parts of nano-aluminum hydroxide, 45 parts of inorganic salt, 95 parts of polyacrylamide, 8 parts of ferrous chloride or ferrous sulfate, 75 parts of sulfonated nitro humic acid, 35 parts of lignosulfonate and 12 parts of potassium chlorate.
The invention is further configured to: the polyacrylamide is cationic polyacrylamide with the number average molecular weight of 300-1500 ten thousand.
By adopting the technical scheme, the polyacrylamide with low molecular weight can be preferentially adsorbed on clay particles through hydrogen bond adsorption with the surfaces of the clay particles, and the cationic polyacrylamide is selected to have stronger adsorption with clay with negative charges, better compatibility with the complexed sulfonated nitro humic acid and lignosulfonate and stronger inhibition effect on hydration expansion of the clay.
The invention is further configured to: the preparation method of the sulfonated nitrohumic acid comprises the following steps: reacting 80-100 parts by weight of lignite with fineness of 60-120 meshes and 20-25 parts by weight of dilute nitric acid with mass fraction of 60-68% at 35-45 ℃ for 30-40min to obtain nitrohumic acid;
reacting the nitro humic acid with sodium hydroxide and sodium bisulfite at the temperature of 120-160 ℃ for 5-7h to obtain sulfonated nitro humic acid, wherein the mass ratio of the sodium bisulfite to the nitro humic acid is 7-10: 100, the mass ratio of sodium hydroxide to nitrohumic acid is 7-10: 100.
the invention is further configured to: the preparation method of the nano hydroxyl aluminum comprises the following steps: mixing 80-100 parts by weight of sodium metaaluminate and 25-35% by weight of sulfuric acid at 10-20 ℃, wherein the pH value of the mixed solution is 5-6, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 20-30min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percent of 38-45% for 20-24h at the rotating speed of 200-250rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 35-45% of sodium sulfate by mass, stirring, controlling the pH of the obtained mixed liquid to be 5-7, performing suction filtration, and standing at the constant temperature of 200-250 ℃ for 5-6h to obtain the nano aluminum hydroxide.
The invention is further configured to: the lignosulfonate is calcium lignosulfonate with the number average molecular weight of 800-10000.
The invention is further configured to: the inorganic salt comprises one or more of sodium chloride, potassium chloride or ammonium chloride, and is preferably potassium chloride.
By adopting the technical scheme, the potassium ions have small hydration radius and low hydration energy, can be embedded in a six-ring formed by adjacent crystal layer oxygen atoms, are not easy to be replaced by other ions, can effectively reduce the hydration expansion of the clay, inhibit the hydration of the clay, and particularly have better hydration expansion effect on the clay when being matched with polyacrylamide for use.
In order to achieve the second object, the invention provides the following technical scheme: the preparation method of the clay inhibitor for the drilling fluid comprises the following steps: mixing and stirring sulfonated nitro humic acid, lignosulfonate, potassium chlorate and ferrous chloride or ferrous sulfate, reacting at 80-100 ℃ for 1-1.5h, adjusting the temperature to 35-40 ℃, adjusting the pH value to 9-11, sequentially adding nano aluminum hydroxide and inorganic salt, stirring for 20-30min, adding polyacrylamide, stirring at 50-60 ℃ for 2-3h, drying and crushing to obtain the clay inhibitor, wherein the crushing can be set according to requirements to obtain powder or granules.
By adopting the technical scheme, the clay inhibitor prepared by the scheme has a strong inhibiting effect on hydration expansion of clay, and particularly can be used for water-based drilling fluid, so that the rheological property of the drilling fluid can be well improved, the dynamic shear force is reduced, the viscosity is reduced, the power loss of a drilling fluid pump is reduced, the drilling speed can be increased, particularly the influence on the filtration loss of the drilling fluid is small, and the clay inhibitor has good compatibility and inhibiting effect on high-density drilling fluid, high-temperature drilling fluid, high-salinity drilling fluid and saturated salt water drilling fluid.
In conclusion, the invention has the following beneficial effects:
1. the clay inhibitor obtained by compounding the mixture of the nano-aluminum hydroxide, the polyacrylamide, the inorganic salt, the sulfonated nitro humic acid and the lignosulfonate complex has a strong inhibiting effect on the hydration expansion of clay, so that the clay inhibitor plays an important role in stabilizing the well wall, and particularly can reduce the collapse of the well wall and various troubles caused by the collapse, especially for a mud shale bottom layer with high clay content, and because the clay inhibitor inhibits the hydration capability of the clay in the drilling fluid, the rheological property of the drilling fluid is well improved, the dynamic shear force is reduced, the viscosity is reduced, the power loss of a drilling fluid pump is reduced, and the drilling speed can be increased;
2. compared with the existing clay inhibitor, the clay inhibitor prepared by the invention has little influence on the drainability of the drilling fluid, has good salt resistance and temperature resistance, and can not be decomposed to lose the inhibiting function when used in the high-temperature environment of 200-250 ℃;
3. the clay inhibitor prepared by the method has good compatibility and inhibition effect on high-density drilling fluid, high-temperature drilling fluid, high-salinity drilling fluid and saturated salt water drilling fluid.
Detailed Description
The present invention will be described in further detail with reference to examples.
The raw materials used in the examples and preparation examples of the present invention are commercially available.
The invention provides a clay inhibitor for drilling fluid, which is prepared from the following raw materials in parts by weight: 40-80 parts of nano-aluminum hydroxide, 30-60 parts of inorganic salt, 70-120 parts of polyacrylamide, 5-10 parts of ferrous chloride or ferrous sulfate, 50-100 parts of sulfonated nitro humic acid, 20-50 parts of lignosulfonate and 8-15 parts of potassium chlorate;
wherein, the nano hydroxyl aluminum is prepared by the following preparation examples 1-10 of nano hydroxyl aluminum, and the sulfonated nitro humic acid is prepared by the following preparation examples 1-3 of sulfonated nitro humic acid;
the inorganic salt comprises one or more of sodium chloride, potassium chloride or ammonium chloride, and is preferably potassium chloride;
the polyacrylamide is cationic polyacrylamide with the number average molecular weight of 300-1500 ten thousand, and is purchased from environmental protection technology Limited company of northern cyan vast (Beijing);
the lignosulfonate is calcium lignosulfonate with the number average molecular weight of 800-10000, is purchased from Jinan Zhongwei chemical industry Co., Ltd, and has the brand of Zhongwei and model-dimensional industrial grade.
Preparation examples 1 to 10 of Mono-and Nano-sized aluminum hydroxide
Preparation example 1 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 90g of sodium metaaluminate and 30% of sulfuric acid by mass at 15 ℃, wherein the pH value of the mixed solution is 6, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 25min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percentage of 40% for 22 hours at the rotating speed of 220rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 40 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 6, carrying out suction filtration, and standing at a constant temperature of 220 ℃ for 5.5 hours to obtain the nano-aluminum hydroxide.
Wherein the liquid sodium aluminate is purchased from Shandong Lier New materials GmbH.
Preparation example 2 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 90g of sodium metaaluminate and 30% of sulfuric acid by mass at 15 ℃, wherein the pH value of the mixed solution is 5, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 25min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percentage of 40% for 22 hours at the rotating speed of 220rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 40 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 6, carrying out suction filtration, and standing at a constant temperature of 220 ℃ for 5.5 hours to obtain the nano-aluminum hydroxide.
Preparation example 3 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 90g of sodium metaaluminate and 30% of sulfuric acid by mass at 15 ℃, wherein the pH value of the mixed solution is 5, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 25min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percentage of 40% for 22 hours at the rotating speed of 220rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 40 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 5, carrying out suction filtration, and standing at a constant temperature of 220 ℃ for 5.5 hours to obtain the nano-aluminum hydroxide.
Preparation example 4 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 90g of sodium metaaluminate and 30% of sulfuric acid by mass at 15 ℃, wherein the pH value of the mixed solution is 5, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 25min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percentage of 40% for 22 hours at the rotating speed of 220rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 40 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 7, performing suction filtration, and standing at a constant temperature of 220 ℃ for 5.5 hours to obtain the nano-aluminum hydroxide.
Preparation example 5 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 90g of sodium metaaluminate and 30% of sulfuric acid by mass at 15 ℃, wherein the pH value of the mixed solution is 6, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 25min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percentage of 40% for 22 hours at the rotating speed of 220rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 40 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 6, carrying out suction filtration, and standing at a constant temperature of 200 ℃ for 5.5 hours to obtain the nano-aluminum hydroxide.
Preparation example 6 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 90g of sodium metaaluminate and 30% of sulfuric acid by mass at 15 ℃, wherein the pH value of the mixed solution is 6, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 25min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percentage of 40% for 22 hours at the rotating speed of 220rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 40 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 6, carrying out suction filtration, and standing at a constant temperature of 250 ℃ for 5.5 hours to obtain the nano-aluminum hydroxide.
Preparation example 7 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 90g of sodium metaaluminate and 30% of sulfuric acid by mass at 15 ℃, wherein the pH value of the mixed solution is 6, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 25min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percentage of 40% for 22 hours at the rotating speed of 200rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 40 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 6, carrying out suction filtration, and standing at a constant temperature of 220 ℃ for 5.5 hours to obtain the nano-aluminum hydroxide.
Preparation example 8 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 90g of sodium metaaluminate and 30% of sulfuric acid by mass at 15 ℃, wherein the pH value of the mixed solution is 6, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 25min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percent of 40% for 22 hours at the rotating speed of 250rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 40 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 6, carrying out suction filtration, and standing at a constant temperature of 220 ℃ for 5.5 hours to obtain the nano-aluminum hydroxide.
Preparation example 9 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 80g of sodium metaaluminate and 25% of sulfuric acid by mass at 10 ℃, wherein the pH value of the mixed solution is 5, then adding 2 times of volume of water into the obtained mixed solution, stirring and mixing, then standing for 20min, and removing supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percent of 38% for 20 hours at the rotating speed of 220rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, adding 35 percent by mass of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 5, performing suction filtration, and standing at a constant temperature of 200 ℃ for 5 hours to obtain the nano-aluminum hydroxide.
Preparation example 10 of Nano aluminum hydroxide
A preparation method of nano hydroxyl aluminum comprises the following steps: mixing 100g of sodium metaaluminate and 35% of sulfuric acid by mass at 20 ℃, wherein the pH value of the mixed solution is 6, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 30min, and removing the supernatant to obtain hydrated alumina;
stirring 45 mass percent of liquid sodium aluminate for 24 hours at the rotating speed of 220rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 45 mass percent of sodium sulfate, stirring, controlling the pH of the obtained mixed liquid to be 7, performing suction filtration, and standing at a constant temperature of 250 ℃ for 6 hours to obtain the nano-aluminum hydroxide.
Preparation examples 1 to 3 of sulfonated Nitro-humic acid
Preparation example 1 of sulfonated Nitro-humic acid
A preparation method of sulfonated nitrohumic acid comprises the following steps: reacting 90g of lignite with 22g of dilute nitric acid with the mass fraction of 65% at 40 ℃ for 35min to obtain nitrohumic acid;
reacting nitro humic acid with sodium hydroxide and sodium bisulfite at 135 ℃ for 6h to obtain sulfonated nitro humic acid, wherein the mass ratio of the sodium bisulfite to the nitro humic acid is 8: 100, the mass ratio of the sodium hydroxide to the nitro humic acid is 8: 100.
wherein, the lignite is purchased from a new and good marketing center of Houma city, the mass percentage of the humic acid is 40-50%, and the fineness is 60-120 meshes.
Preparation example 2 of sulfonated Nitro-humic acid
A preparation method of sulfonated nitrohumic acid comprises the steps of reacting 80g of lignite with 20g of dilute nitric acid with the mass fraction of 60% at 35 ℃ for 30min to obtain nitrohumic acid;
reacting nitro humic acid with sodium hydroxide and sodium bisulfite at 120 ℃ for 5h to obtain sulfonated nitro humic acid, wherein the mass ratio of the sodium bisulfite to the nitro humic acid is 7: 100, the mass ratio of sodium hydroxide to nitrohumic acid is 7: 100.
preparation example 3 of sulfonated Nitro-humic acid
A preparation method of sulfonated nitrohumic acid comprises the steps of reacting 100g of lignite with 25g of dilute nitric acid with the mass fraction of 68% at 45 ℃ for 40min to obtain nitrohumic acid;
reacting nitro humic acid with sodium hydroxide and sodium bisulfite at 160 ℃ for 7h to obtain sulfonated nitro humic acid, wherein the mass ratio of the sodium bisulfite to the nitro humic acid is 10: 100, the mass ratio of sodium hydroxide to nitrohumic acid is 1: 10.
examples
Example 1
The preparation method of the clay inhibitor for the drilling fluid comprises the following steps: mixing and stirring 50g of sulfonated nitrohumic acid (preparation example 1 of the sulfonated nitrohumic acid is selected), 20g of lignosulfonate, 8g of potassium chlorate and 5g of ferrous sulfate, reacting for 1 hour at 80 ℃, then adjusting the temperature to 35 ℃, adjusting the pH value to 9, then sequentially adding 40g of nano aluminum hydroxide (preparation example 1 of the nano aluminum hydroxide is selected) and 30g of potassium chloride, stirring for 20 minutes, then adding 70g of polyacrylamide, stirring for 2 hours at 50 ℃, and then drying and crushing to obtain the clay inhibitor.
Examples 2 to 21
A process for the preparation of a clay inhibitor for drilling fluids was carried out as in example 1, except that the additions were made according to the following raw materials in table 1.
Table 1:
| sulfonated nitro humic acid (g) | Lignosulfonate (g) | Potassium chlorate (g) | Ferrous sulfate (g) | Nano hydroxy aluminium (g) | Potassium chloride (g) | Polyacrylamide (g) | |
| Example 1 | 50 | 20 | 8 | 5 | 40 | 30 | 70 |
| Example 2 | 70 | 20 | 8 | 5 | 40 | 30 | 70 |
| Example 3 | 75 | 20 | 8 | 5 | 40 | 30 | 70 |
| Example 4 | 80 | 20 | 8 | 5 | 40 | 30 | 70 |
| Example 5 | 100 | 20 | 8 | 5 | 40 | 30 | 70 |
| Example 6 | 75 | 30 | 8 | 5 | 40 | 30 | 70 |
| Example 7 | 75 | 35 | 8 | 5 | 40 | 30 | 70 |
| Example 8 | 75 | 40 | 8 | 5 | 40 | 30 | 70 |
| Example 9 | 75 | 50 | 8 | 5 | 40 | 30 | 70 |
| Example 10 | 75 | 35 | 8 | 5 | 55 | 30 | 70 |
| Example 11 | 75 | 35 | 8 | 5 | 60 | 30 | 70 |
| Example 12 | 75 | 35 | 8 | 5 | 65 | 30 | 70 |
| Example 13 | 75 | 35 | 8 | 5 | 80 | 30 | 70 |
| Example 14 | 75 | 35 | 8 | 5 | 60 | 30 | 85 |
| Example 15 | 75 | 35 | 8 | 5 | 60 | 30 | 95 |
| Example 16 | 75 | 35 | 8 | 5 | 60 | 30 | 105 |
| Example 17 | 75 | 35 | 8 | 5 | 60 | 30 | 120 |
| Example 18 | 75 | 35 | 10 | 6 | 60 | 40 | 95 |
| Example 19 | 75 | 35 | 12 | 8 | 60 | 45 | 95 |
| Example 20 | 75 | 35 | 13 | 9 | 60 | 50 | 95 |
| Example 21 | 75 | 35 | 15 | 10 | 60 | 60 | 95 |
Example 22
The preparation method of the clay inhibitor for the drilling fluid comprises the following steps: mixing and stirring 50g of sulfonated nitrohumic acid (preparation example 1 of the sulfonated nitrohumic acid is selected), 20g of lignosulfonate, 8g of potassium chlorate and 5g of ferrous chloride, reacting for 1 hour at 80 ℃, then adjusting the temperature to 35 ℃, adjusting the pH value to 9, then sequentially adding 40g of nano aluminum hydroxide (preparation example 1 of the nano aluminum hydroxide is selected) and 30g of potassium chloride, stirring for 20 minutes, then adding 70g of polyacrylamide, stirring for 2 hours at 50 ℃, and then drying and crushing to obtain the clay inhibitor.
Example 23
A process for the preparation of a clay inhibitor for drilling fluids as in example 1, except that the inorganic salt is ammonium chloride.
Example 24
A process for preparing a clay inhibitor for drilling fluids was carried out as in example 1, except that the inorganic salt was sodium chloride.
Example 25
The preparation method of the clay inhibitor for the drilling fluid comprises the following steps: mixing and stirring 50g of sulfonated nitrohumic acid (preparation example 1 of the sulfonated nitrohumic acid is selected), 20g of lignosulfonate, 8g of potassium chlorate and 5g of ferrous sulfate, reacting for 1.5h at 100 ℃, then adjusting the temperature to 40 ℃, adjusting the pH value to 11, then sequentially adding 40g of nano aluminum hydroxide (preparation example 1 of the nano aluminum hydroxide is selected) and 30g of potassium chloride, stirring for 30min, then adding 70g of polyacrylamide, stirring for 3h at 60 ℃, then drying and crushing to obtain the inhibitor for clay.
Example 26
The preparation method of the clay inhibitor for the drilling fluid comprises the following steps: mixing and stirring 50g of sulfonated nitrohumic acid (preparation example 1 of the sulfonated nitrohumic acid is selected), 20g of lignosulfonate, 8g of potassium chlorate and 5g of ferrous sulfate, reacting for 1 hour at 80 ℃, then adjusting the temperature to 35 ℃, adjusting the pH value to 9, then sequentially adding 40g of nano aluminum hydroxide (preparation example 1 of the nano aluminum hydroxide is selected) and 30g of potassium chloride, stirring for 20 minutes, then adding 70g of polyacrylamide, stirring for 2 hours at 50 ℃, and then drying and crushing to obtain the clay inhibitor.
Examples 27 to 35
The preparation method of the clay inhibitor for the drilling fluid is carried out according to the method in the embodiment 19, and is characterized in that sulfonated nitro humic acid is prepared in the preparation examples 2 to 10 of sulfonated nitro humic acid in sequence.
Examples 36 to 37
The preparation method of the clay inhibitor for the drilling fluid is carried out according to the method in the embodiment 19, and the difference is that the nano hydroxy aluminum prepared in the preparation examples 2-3 of the nano hydroxy aluminum is sequentially selected as the nano hydroxy aluminum.
Comparative example 1
A method for preparing a clay inhibitor for drilling fluid was carried out in the same manner as in example 1, except that 60g of sulfonated nitrohumic acid was added.
Comparative example 2
A method for preparing a clay inhibitor for drilling fluid was carried out in the same manner as in example 1, except that the amount of the sulfonated nitrohumic acid added was 110 g.
Comparative example 3
The preparation method of the clay inhibitor for the drilling fluid is carried out according to the method in the example 1, except that nano aluminum hydroxide is not added in the raw materials.
Comparative example 4
The preparation method of the clay inhibitor for the drilling fluid is carried out according to the method in the example 1, except that the addition amount of the nano aluminum hydroxide is 35 g.
Comparative example 5
The preparation method of the clay inhibitor for the drilling fluid is carried out according to the method in the example 1, except that the addition amount of the nano aluminum hydroxide is 85 g.
Performance test
The clay inhibitors prepared in the examples and the comparative examples of the present invention were measured for apparent viscosity reduction rate after water g, 40 mesh wet sieve residue and high wet hot rolling, respectively, according to the Q/SY HQZ 0007-.
Table 2:
| item | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 |
| Moisture content (%) | 8.9 | 8.6 | 8.4 | 8.7 | 8.8 | 8.3 | 8.1 | 8.4 |
| Wet sieve residue (%) | 9.2 | 9.0 | 8.7 | 9.0 | 9.2 | 8.6 | 8.4 | 8.7 |
| Apparent viscosity reduction after high-temperature Rolling heating (%) | 68.3 | 69.5 | 70.2 | 68.9 | 68.8 | 71.5 | 72.6 | 71.2 |
| Item | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 | Example 14 | Example 15 | Example 16 |
| Moisture content (%) | 8.5 | 8.3 | 8.1 | 8.2 | 8.3 | 8.0 | 7.8 | 7.6 |
| Wet sieve residue (%) | 8.8 | 8.6 | 8.5 | 8.6 | 8.7 | 8.3 | 8.1 | 7.9 |
| Apparent viscosity reduction after high-temperature Rolling heating (%) | 70.9 | 72.9 | 73.8 | 72.5 | 71.8 | 74.1 | 75.8 | 74.9 |
Continuing with Table 2:
| item | Example 17 | Example 18 | Example 19 | Example 20 | Example 21 | Example 22 | Example 23 | Example 24 |
| Moisture content (%) | 7.9 | 7.4 | 6.8 | 7.0 | 7.3 | 6.8 | 7.1 | 6.9 |
| Wet sieve residue (%) | 8.2 | 7.7 | 7.1 | 7.3 | 7.6 | 7.2 | 7.5 | 7.2 |
| Apparent viscosity reduction after high-temperature Rolling heating (%) | 73.8 | 74.5 | 75.8 | 74.6 | 74.0 | 75.9 | 75.2 | 74.9 |
| Item | Example 25 | Example 26 | Example 27 | Example 28 | Example 29 | Example 30 | Example 31 | Example 32 |
| Moisture content (%) | 6.9 | 7.0 | 7.0 | 7.1 | 7.1 | 7.2 | 7.3 | 7.2 |
| Wet sieve residue (%) | 7.1 | 7.3 | 7.4 | 7.4 | 7.3 | 7.5 | 7.6 | 7.5 |
| Apparent viscosity reduction after high-temperature Rolling heating (%) | 75.5 | 75.7 | 74.8 | 75.0 | 74.8 | 73.8 | 73.1 | 73.5 |
| Item | Example 33 | Example 34 | Example 35 | Example 36 | Example 37 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Moisture content (%) | 7.4 | 7.6 | 7.1 | 7.0 | 6.9 | 13.2 | 17.0 | 15.1 |
| Wet sieve residue (%) | 7.7 | 7.8 | 7.4 | 7.3 | 7.2 | 13.8 | 18.6 | 17.5 |
| Apparent viscosity reduction after high-temperature Rolling heating (%) | 72.8 | 72.0 | 73.2 | 73.5 | 74.6 | 57.2 | 49.8 | 50.8 |
In comparative example 4, the moisture content was determined to be 11.5%, the wet sieve residue was 14.6%, and the apparent viscosity reduction rate after high temperature tumbling was 52.8%; in comparative example 5, the moisture content was determined to be 12.7%, the screen residue was 15.4%, and the apparent viscosity reduction rate after high-temperature tumbling was 48.5%.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The clay inhibitor for the drilling fluid is characterized by being prepared from the following raw materials in parts by weight: 40-80 parts of nano aluminum hydroxide, 30-60 parts of inorganic salt, 70-120 parts of polyacrylamide, 5-10 parts of ferrous chloride or ferrous sulfate, 50-100 parts of sulfonated nitro humic acid, 20-50 parts of lignosulfonate and 8-15 parts of potassium chlorate, wherein the polyacrylamide is cationic polyacrylamide with the number average molecular weight of 300-1500 ten thousand.
2. The clay inhibitor for the drilling fluid according to claim 1, wherein the clay inhibitor is prepared from the following raw materials in parts by weight: 55-65 parts of nano-aluminum hydroxide, 40-50 parts of inorganic salt, 85-105 parts of polyacrylamide, 6-9 parts of ferrous chloride or ferrous sulfate, 70-80 parts of sulfonated nitro humic acid, 30-40 parts of lignosulfonate and 10-13 parts of potassium chlorate.
3. The clay inhibitor for the drilling fluid according to claim 1, wherein the clay inhibitor is prepared from the following raw materials in parts by weight: 60 parts of nano-aluminum hydroxide, 45 parts of inorganic salt, 95 parts of polyacrylamide, 8 parts of ferrous chloride or ferrous sulfate, 75 parts of sulfonated nitro humic acid, 35 parts of lignosulfonate and 12 parts of potassium chlorate.
4. The clay inhibitor for the drilling fluid as claimed in claim 1, wherein the sulfonated nitro humic acid is prepared by the following method: reacting 80-100 parts by weight of lignite with fineness of 60-120 meshes and 20-25 parts by weight of dilute nitric acid with mass fraction of 60-68% at 35-45 ℃ for 30-40min to obtain nitrohumic acid;
reacting the nitro humic acid with sodium hydroxide and sodium bisulfite at the temperature of 120-160 ℃ for 5-7h to obtain sulfonated nitro humic acid, wherein the mass ratio of the sodium bisulfite to the nitro humic acid is 7-10: 100, the mass ratio of sodium hydroxide to nitrohumic acid is 7-10: 100.
5. the clay inhibitor for the drilling fluid as claimed in claim 1, wherein the preparation method of the nano aluminum hydroxide comprises the following steps: mixing 80-100 parts by weight of sodium metaaluminate and 25-35% by weight of sulfuric acid at 10-20 ℃, wherein the pH value of the mixed solution is 5-6, then adding 2 times of the volume of water into the obtained mixed solution, stirring and mixing, then standing for 20-30min, and removing the supernatant to obtain hydrated alumina;
stirring liquid sodium aluminate with the mass percent of 38-45% for 20-24h at the rotating speed of 200-250rmp to obtain aluminum hydroxide nano micelles;
mixing aluminum hydroxide nano micelle and hydrated alumina according to the proportion of 1: 1, then adding 35-45% of sodium sulfate by mass, stirring, controlling the pH of the obtained mixed liquid to be 5-7, performing suction filtration, and standing at the constant temperature of 200-250 ℃ for 5-6h to obtain the nano aluminum hydroxide.
6. The clay inhibitor for drilling fluid as claimed in claim 1, wherein the lignosulfonate is calcium lignosulfonate with number average molecular weight of 800-10000.
7. The clay inhibitor for drilling fluid according to claim 1, wherein the inorganic salt comprises one or more of sodium chloride, potassium chloride or ammonium chloride.
8. The preparation method of the clay inhibitor for the drilling fluid, which is described in any one of claims 1 to 7, is characterized by comprising the following steps: mixing and stirring sulfonated nitro humic acid, lignosulfonate, potassium chlorate and ferrous chloride or ferrous sulfate, reacting for 1-1.5h at 80-100 ℃, adjusting the temperature to 35-40 ℃, adjusting the pH value to 9-11, sequentially adding nano hydroxy aluminum and inorganic salt, stirring for 20-30min, adding polyacrylamide, stirring for 2-3h at 50-60 ℃, drying and crushing to obtain the clay inhibitor.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045989A (en) * | 1990-04-16 | 1990-10-10 | 王�锋 | Well-drilling composition diluent |
| CN101717624B (en) * | 2009-11-17 | 2013-01-30 | 中国海洋石油总公司 | High-efficient water-based well drilling fluid with fast absorption, strong inhibition and low damage |
| CN109439292A (en) * | 2018-10-22 | 2019-03-08 | 新疆水处理工程技术研究中心有限公司 | Clay stabilizer |
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| US9080097B2 (en) * | 2010-05-28 | 2015-07-14 | Baker Hughes Incorporated | Well servicing fluid |
| US10280361B2 (en) * | 2016-06-20 | 2019-05-07 | Baker Hughes, A Ge Company, Llc | Hydrophobized nanoparticles as breaker for viscoelastic surfactant gelled fluids |
| US10702843B2 (en) * | 2018-03-29 | 2020-07-07 | Baker Hughes, A Ge Company, Llc | Compositions of matter comprising suspended nanoparticles and related methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1045989A (en) * | 1990-04-16 | 1990-10-10 | 王�锋 | Well-drilling composition diluent |
| CN101717624B (en) * | 2009-11-17 | 2013-01-30 | 中国海洋石油总公司 | High-efficient water-based well drilling fluid with fast absorption, strong inhibition and low damage |
| CN109439292A (en) * | 2018-10-22 | 2019-03-08 | 新疆水处理工程技术研究中心有限公司 | Clay stabilizer |
Non-Patent Citations (1)
| Title |
|---|
| 纳米羟基铝吸附砷的研究;王静宜，等;《环境科学与技术》;20151215;第38卷(第120期);第78-84页 * |
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