CN115725278A - Environment-friendly temperature-resistant and salt-resistant amino filtrate reducer for drilling fluid and preparation method thereof - Google Patents
Environment-friendly temperature-resistant and salt-resistant amino filtrate reducer for drilling fluid and preparation method thereof Download PDFInfo
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- CN115725278A CN115725278A CN202211364930.6A CN202211364930A CN115725278A CN 115725278 A CN115725278 A CN 115725278A CN 202211364930 A CN202211364930 A CN 202211364930A CN 115725278 A CN115725278 A CN 115725278A
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- 238000005553 drilling Methods 0.000 title claims abstract description 45
- 239000012530 fluid Substances 0.000 title claims abstract description 41
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 21
- 239000000706 filtrate Substances 0.000 title claims abstract description 21
- 150000003839 salts Chemical class 0.000 title claims abstract description 14
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 title claims abstract description 11
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
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- 239000000654 additive Substances 0.000 claims abstract description 24
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 238000001035 drying Methods 0.000 claims description 16
- 241000196324 Embryophyta Species 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 9
- 238000007873 sieving Methods 0.000 claims description 8
- VAPQAGMSICPBKJ-UHFFFAOYSA-N 2-nitroacridine Chemical compound C1=CC=CC2=CC3=CC([N+](=O)[O-])=CC=C3N=C21 VAPQAGMSICPBKJ-UHFFFAOYSA-N 0.000 claims description 7
- 240000006240 Linum usitatissimum Species 0.000 claims description 5
- 235000004431 Linum usitatissimum Nutrition 0.000 claims description 5
- 244000250129 Trigonella foenum graecum Species 0.000 claims description 5
- 235000001484 Trigonella foenum graecum Nutrition 0.000 claims description 5
- 235000001019 trigonella foenum-graecum Nutrition 0.000 claims description 5
- 229920002907 Guar gum Polymers 0.000 claims description 3
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 3
- 150000001412 amines Chemical class 0.000 claims description 3
- 235000010417 guar gum Nutrition 0.000 claims description 3
- 239000000665 guar gum Substances 0.000 claims description 3
- 229960002154 guar gum Drugs 0.000 claims description 3
- 235000011118 potassium hydroxide Nutrition 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
- 235000004426 flaxseed Nutrition 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 244000275012 Sesbania cannabina Species 0.000 claims 1
- 239000002981 blocking agent Substances 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 18
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 238000011085 pressure filtration Methods 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 239000012467 final product Substances 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 241000219782 Sesbania Species 0.000 description 5
- 239000008186 active pharmaceutical agent Substances 0.000 description 5
- 238000007790 scraping Methods 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 239000012153 distilled water Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
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- 229920000642 polymer Polymers 0.000 description 4
- OMDQUFIYNPYJFM-XKDAHURESA-N (2r,3r,4s,5r,6s)-2-(hydroxymethyl)-6-[[(2r,3s,4r,5s,6r)-4,5,6-trihydroxy-3-[(2s,3s,4s,5s,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]methoxy]oxane-3,4,5-triol Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@@H]1OC[C@@H]1[C@@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@@H](CO)O2)O)[C@H](O)[C@H](O)[C@H](O)O1 OMDQUFIYNPYJFM-XKDAHURESA-N 0.000 description 3
- 229920000926 Galactomannan Polymers 0.000 description 3
- 102100021913 Sperm-associated antigen 8 Human genes 0.000 description 3
- 101710098579 Sperm-associated antigen 8 Proteins 0.000 description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 3
- 239000010428 baryte Substances 0.000 description 3
- 229910052601 baryte Inorganic materials 0.000 description 3
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- 239000000463 material Substances 0.000 description 3
- 244000045232 Canavalia ensiformis Species 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 235000010617 Phaseolus lunatus Nutrition 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
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- 229910000281 calcium bentonite Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
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- 238000005189 flocculation Methods 0.000 description 1
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- 238000006703 hydration reaction Methods 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
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Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of drilling fluid, and particularly discloses an environment-friendly temperature-resistant and salt-resistant amino filtrate reducer for drilling fluid and a preparation method thereof, wherein the filtrate reducer is generated by heating a hydrolysis product of polyacrylonitrile under an alkaline condition, natural plant gum and an additive in water; the weight portions of the raw materials participating in the reaction are as follows: 5-15 parts of polyacrylonitrile, 2-7 parts of alkaline substances, 5-15 parts of natural vegetable gum, 0.3-1.5 parts of additives and 60-90 parts of water, the natural vegetable gum used in the invention can be degraded with time, and cannot cause pollution to stratum, and meanwhile, because the blocking agent uses the hydrolysis product of the polyacrylonitrile, the blocking agent is generated under the high-temperature alkaline condition, the invention can be suitable for the high-temperature high-salt environment.
Description
Technical Field
The invention belongs to the technical field of drilling fluid, and particularly relates to an environment-friendly temperature-resistant and salt-resistant amino filtrate reducer for drilling fluid and a preparation method thereof.
Background
In the process of petroleum drilling exploration, the synthesis of the environment-friendly treating agent by using renewable resources without using or generating harmful substances becomes an important development direction of the treating agent for the drilling fluid. With the increasingly strict national requirements on environmental protection, especially the implementation of new environmental protection laws, the development of traditional synthetic polymer drilling fluid treating agents is greatly limited. The renewable natural polymer comes from animal, plant and microorganism resources in nature, and is an inexhaustible renewable resource. Moreover, the materials are easily decomposed into water, carbon dioxide and inorganic small molecules by natural microorganisms after being discarded, and belong to environment-friendly materials. Meanwhile, the international crude oil price is low, and the drilling engineering cost is further reduced, so that the drilling fluid cost is reduced by a new process and a new technology. The natural polymer drilling fluid filtrate reducer is produced by taking natural vegetable gum as a main raw material, is environment-friendly, can meet the requirement of environmental protection, and has lower cost compared with other treating agents.
The filtrate reducer is a chemical additive which needs to be added in the oil field drilling fluid. Fluid loss agents are also known as fluid loss control agents, fluid loss agents. During the drilling process, the filtrate of the drilling fluid invades the stratum to cause the hydration and expansion of the shale, and in severe cases, the instability of the well wall and various downhole complex conditions are caused. The purpose of adding the fluid loss additive is to reduce the fluid loss of the drilling fluid as much as possible by forming a low-permeability, flexible, thin and compact filter cake on the well wall so as to ensure the stable performance of the drilling fluid, reduce the filtration of harmful liquid to the stratum, stabilize the well wall and ensure the well diameter regulation. The filtrate reducer on the market at present is generally an artificial polymer filtrate reducer, and cannot be naturally explained after permeating into a stratum, so that certain pollution is caused to the environment; the application range is narrow, and the filter element can not adapt to the high-temperature and high-salt environment of an oil well, so that the environment-friendly temperature-resistant and salt-resistant amino filtrate reducer for the drilling fluid and the preparation method thereof are provided.
Disclosure of Invention
The invention aims to provide an environment-friendly temperature-resistant and salt-resistant amino filtrate reducer for drilling fluid and a preparation method thereof, and aims to solve the problems that the artificial polymer filtrate reducer provided in the background art causes environmental pollution in the using process and cannot tolerate high-temperature and high-salt environments.
In order to achieve the purpose, the invention provides the following technical scheme:
an environment-friendly temperature-resistant salt-resistant amino filtrate reducer for drilling fluid is generated by heating a hydrolysis product of polyacrylonitrile under an alkaline condition, natural plant gum and an additive in water to react; the weight portions of the raw materials participating in the reaction are as follows: 5-15 parts of polyacrylonitrile, 2-7 parts of alkaline substances, 5-15 parts of natural vegetable gum, 0.3-1.5 parts of additives and 60-90 parts of water.
The alkaline substance is one or more of sodium hydroxide, potassium hydroxide, calcium hydroxide, water glass and ammonia water.
The natural vegetable gum is one or more of linseed gum, sesbania gum, guar gum, flax gum and fenugreek gum.
The additive is one or more of potassium acrylate, N- (aminopropyl) methyl potassium acrylate, 2-acrylamide-2-methyl acrylate, N-dimethyl formamide and N, N-dimethyl acetamide.
The heating reaction temperature is 80-120 ℃, and the reaction time is 20-30 h.
A preparation method of an environment-friendly temperature-resistant and salt-resistant amino filtrate reducer for drilling fluid comprises the following steps:
(1) Adding polyacrylonitrile and alkaline substance into water, and stirring at 80-120 deg.C for reaction for 12-20h;
(2) Dissolving natural plant gum in water, stirring at room temperature for 0.5-1.5 hr to make it fully dissolved;
(3) Adding the solution obtained in the step (2) into the reaction system obtained in the step (1), and continuously stirring and reacting for 2-5 h at the temperature of 80-120 ℃;
(4) Adding the additive into the reaction system in the step (3), and continuously stirring and reacting for 3-6 h at the temperature of 80-120 ℃;
(5) And (5) filtering, drying, crushing and sieving the reaction product obtained in the step (4) to obtain the environment-friendly temperature-resistant salt-resistant amino filtrate reducer for the drilling fluid.
The drying temperature of the product in the step (5) is 80-100 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the natural plant used in the invention is rich in galactomannan, has flocculation effect on clay, can reduce the influence of polyacrylonitrile hydrolysate on the viscosity of drilling fluid, enables the polyacrylonitrile hydrolysate (hydrolyzed polyacrylonitrile-sodium salt in the invention) to fully play the role of a blocking agent, and reduces the filter loss.
Detailed Description
The technical solutions in the specification will be clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Putting 8kg of polyacrylonitrile and 3kg of sodium hydroxide into a reaction kettle, adding 65kg of water into the reaction kettle, raising the temperature to 80 ℃, stirring, and carrying out hydrolysis reaction on the polyacrylonitrile under an alkaline condition for 15 hours; dissolving 3kg of each of fenugreek gum and sesbania gum in a proper amount of water, adding the obtained plant gum solution into a reaction kettle, and reacting for 3h at 80 ℃; adding 0.4kg of a mixture of potassium acrylate and N- (aminopropyl) potassium methacrylate into a reaction kettle, raising the temperature to 90 ℃, continuing to react for 4 hours, filtering the solution, taking a solid substance, drying in a drying box at 90 ℃, crushing and sieving to obtain a final product.
Example 2
Putting 10kg of polyacrylonitrile and 3.75kg of potassium hydroxide into a reaction kettle, adding 82kg of water into the reaction kettle, raising the temperature to 80 ℃, stirring, and carrying out hydrolysis reaction on the polyacrylonitrile under an alkaline condition for 15 hours; dissolving 4kg of guar gum and 4kg of flax gum in a proper amount of water, adding the obtained plant gum liquid into a reaction kettle, and reacting for 3 hours at 80 ℃; adding 0.5kg of a mixture of potassium acrylate and N- (aminopropyl) potassium methacrylate into a reaction kettle, raising the temperature to 90 ℃, continuing to react for 4 hours, filtering the solution, taking a solid substance, drying in a drying oven at 90 ℃, crushing and sieving to obtain a final product.
Example 3
Putting 12kg of polyacrylonitrile and 4.5kg of sodium hydroxide into a reaction kettle, adding 98kg of water into the reaction kettle, raising the temperature to 100 ℃, stirring, and allowing the polyacrylonitrile to have a hydrolysis reaction under an alkaline condition for 15 hours; dissolving 5kg of each of fenugreek gum and sesbania gum in a proper amount of water, adding the obtained plant gum solution into a reaction kettle, and reacting for 3h at 100 ℃; adding 0.6kg of a mixture of potassium acrylate and N- (aminopropyl) potassium methacrylate into a reaction kettle, raising the temperature to 120 ℃, continuing to react for 4 hours, filtering the solution, taking a solid substance, drying in a drying oven at 120 ℃, crushing and sieving to obtain a final product.
Example 4
Putting 15kg of polyacrylonitrile and 6kg of sodium hydroxide into a reaction kettle, adding 122kg of water into the reaction kettle, raising the temperature to 100 ℃, and stirring to ensure that the polyacrylonitrile is subjected to hydrolysis reaction under an alkaline condition for 15 hours; dissolving 5kg of lima bean gum and 6kg of sesbania gum in a proper amount of water, adding the obtained plant gum solution into a reaction kettle, and reacting for 3 hours at 100 ℃; adding 0.75kg of a mixture of potassium acrylate and N- (aminopropyl) potassium methacrylate into a reaction kettle, raising the temperature to 120 ℃, continuing to react for 4 hours, filtering the solution, taking a solid substance, drying in a drying box at 120 ℃, crushing, and sieving to obtain a final product.
Example 5
Putting 15kg of polyacrylonitrile and 6kg of sodium hydroxide into a reaction kettle, adding 122kg of water into the reaction kettle, raising the temperature to 100 ℃, stirring, and carrying out hydrolysis reaction on the polyacrylonitrile under an alkaline condition for 15 hours; dissolving 11kg of fenugreek gum in a proper amount of water, adding the obtained plant gum solution into a reaction kettle, and reacting for 3 hours at 100 ℃; adding 0.75kg of a mixture of potassium acrylate and N- (aminopropyl) potassium methacrylate into a reaction kettle, raising the temperature to 120 ℃, continuing to react for 4 hours, filtering the solution, taking a solid substance, drying in a drying box at 120 ℃, crushing, and sieving to obtain a final product.
Example 6
Putting 15kg of polyacrylonitrile and 6kg of sodium hydroxide into a reaction kettle, adding 122kg of water into the reaction kettle, raising the temperature to 100 ℃, stirring, and carrying out hydrolysis reaction on the polyacrylonitrile under an alkaline condition for 15 hours; dissolving 5kg of lima bean gum and 6kg of sesbania gum in a proper amount of water, adding the obtained plant gum solution into a reaction kettle, and reacting for 3 hours at 100 ℃; adding 0.75kgN, the mixture of N-dimethylformamide and N, N-dimethylacetamide into a reaction kettle, raising the temperature to 120 ℃, continuing to react for 4 hours, filtering the solution, taking solid substances, drying in a drying oven at 120 ℃, crushing and sieving to obtain the final product.
Testing and detecting:
the detection method of the apparent viscosity, low temperature and low pressure filtration loss after the filtrate reducer is added into fresh water and salt water comprises the following steps:
fresh water: adding 400mL of distilled water, 1.0 g of anhydrous sodium carbonate and 14.0g of test soil for the drilling fluid into a high-stirring cup, stirring at a high speed for 20min, and taking down the wall of the scraping cup for many times in the period; and (3) performing closed maintenance at the temperature of (25 +/-1) ℃ for 24h, then stirring at a high speed for 5min again to determine the apparent viscosity and the low-temperature and low-pressure filtration loss according to the GB/T16783.1-2014 method, wherein the performance values of the apparent viscosity and the low-temperature and low-pressure filtration loss need to reach the values in the table 1, otherwise, the addition of the test soil for the drilling fluid can be adjusted until the test soil reaches the standard. Taking the cured base slurry, and slowly adding 1.6 g (in terms of dry basis) of a sample under the condition of high-speed stirring; stirring at high speed for 30min, taking off and scraping the wall of the test cup with a glass rod. Maintaining at 25 deg.C for 24 hr, stirring at high speed for 5min, and measuring apparent viscosity and low-temperature low-pressure filtration loss according to GB/T16783.1-2014 method.
Saline water: adding 400mL of distilled water, 18.0g of sodium chloride, 2.0g of anhydrous calcium chloride and 5.2g of magnesium chloride into a high-stirring cup to dissolve the distilled water, then adding 3.6g of anhydrous sodium carbonate and 76.0g of test soil for the drilling fluid, stirring at a high speed for 20min, and taking down the scraping cup wall for many times in the period; and (3) after the mixture is maintained at the temperature of (25 +/-1) ℃ in a closed manner for 24 hours, stirring at a high speed for 5 minutes again, and determining the apparent viscosity and the low-temperature and low-pressure filtration loss according to a GB/T16783.1-2014 method, wherein the performance values need to reach the values in the following table, and the addition of the test soil for the drilling fluid can be improperly adjusted until the test soil is proper. Taking the cured base slurry, and slowly adding 8.0g (in terms of dry basis) of a sample under the condition of high-speed stirring; stirring at high speed for 30min, taking off and scraping the wall of the test cup with a glass rod. And curing one part at the constant temperature of 25 ℃ for 24 hours, stirring at a high speed for 5min, and measuring the apparent viscosity and the low-temperature low-pressure filtration loss according to the GB/T16783.1-2014 method. And the other part is put into a roller furnace to be aged for 16h at the temperature of 120 ℃, then is cooled to room temperature, and the low-temperature low-pressure filtration loss is measured according to the method of GB/T16783.1-2014.
The effect of each example in fresh water and salt water was measured as follows:
from the test data in the table above, the environmental-friendly temperature-resistant and salt-tolerant amine-based fluid loss additive for drilling fluid has a small water loss amount in 6% saline water, which shows that the environmental-friendly temperature-resistant and salt-tolerant amine-based fluid loss additive has good salt resistance, and compared with examples 1-3 and examples 4-6, the hydrolysis degree of polyacrylonitrile has a large influence on the fluid loss property of the fluid loss additive, and when the hydrolysis degree of polyacrylonitrile is low, the fluid loss additive can greatly improve the apparent viscosity of base slurry and increase the drilling resistance; when the hydrolysis degree of the polyacrylonitrile is too high, clay particles are difficult to disperse, and the effect of plugging pores cannot be achieved; comparing examples 3 and 4, it is seen that the addition of vegetable gum has an effect on the performance of the fluid loss additive under the same test conditions (the proportions of the other materials in examples 3 and 4 are the same), mainly because the galactomannan content in the vegetable gum is not uniform, the galactomannan flocculates clays and the like, and neutralizes the too high degree of hydrolysis of polyacrylonitrile resulting in too low a base slurry viscosity. From experimental data, example 4 is the best example among the above examples.
Testing the performance of the drilling fluid:
in this test example, the sample of example 4 was selected for testing, and the formula of the polysulfonate high-temperature resistant drilling fluid system was: drilling fluid is diluted with zwitterionic polymer viscosity reducer XY-27+3% drilling fluid is diluted with sulfonated phenolic resin SMP-1+30%, naCl +62% barite.
The test method is as follows:
adding 400mL of distilled water into 4 high-stirring cups, adding 12g of calcium bentonite for drilling fluid, stirring at a high speed for 20min, and taking down the wall of the scraping cup for multiple times in the period; sealing and curing at 25 +/-1 ℃ for 24h.
Taking two parts, respectively adding 1g of anhydrous sodium carbonate, 0.8g of sodium hydroxide, 2.4g of FA-367, 2.4g of XY-27, 12g of SMP-1, 120g of sodium chloride and 248g of barite in sequence, stirring uniformly by using a glass rod after each addition of one medicine, then stirring at a high speed for 15min, and interrupting twice in the stirring process so as to scrape off an adhesive stuck on the wall of a container.
And respectively adding 1g of anhydrous sodium carbonate, 0.8g of sodium hydroxide, 2.4g of FA-367, 2.4g of XY-27, 4.8g of a polymer filtrate reducer sample, 12g of SMP-1, 120g of sodium chloride and 248g of barite into the other two parts in sequence, uniformly stirring the mixture by using a glass rod after each addition of one medicine, then stirring the mixture at a high speed for 15min, and interrupting the stirring process twice to scrape off an adhesive stuck on the wall of the container.
And (3) filling 4 parts of prepared test slurry into an aging tank, putting the aging tank into a roller furnace, rolling and aging at a constant temperature of (120 +/-5) DEG C for 16h, taking out the aging tank, cooling to room temperature, stirring the test slurry at a high speed for 5min, and measuring the apparent viscosity of the test slurry, the API medium-pressure filtration loss and the (120 +/-3) DEG C high-temperature high-pressure filtration loss according to the specification in GB/T16783.1-2014.
The test data are as follows:
| name (R) | AV(mPa·s) | PV(mPa·s) | API·FL(ml) | HTHP·FL（ml） |
| Blank space | 68 | 47 | 11 | 76 |
| Sample application | 64 | 51 | 2.4 | 13 |
Wherein AV is the apparent viscosity of the drilling fluid, PV is the plastic viscosity of the drilling fluid, API & FL is the medium-pressure water loss amount, and HTHP & FL is the high-temperature high-pressure water loss amount; from the above table, it can be seen that the apparent viscosity and plastic viscosity of the drilling fluid system do not change much when the sample obtained in example 4 is added, and API FL and HTHP FL decrease significantly, wherein API FL decreases by 78% and HTHP FL decreases by 83%.
The above description is only for illustrating the technical solution of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solution of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.
Claims (7)
1. An environment-friendly temperature-resistant and salt-resistant amino filtrate reducer for drilling fluid is characterized in that: the filtrate reducer is generated by heating a hydrolysis product of polyacrylonitrile, natural plant gum and an additive in water under an alkaline condition; the weight parts of the raw materials participating in the reaction are as follows: 5-15 parts of polyacrylonitrile, 2-7 parts of alkaline substances, 5-15 parts of natural vegetable gum, 0.3-1.5 parts of additives and 60-90 parts of water.
2. The environment-friendly temperature-resistant salt-amine-based fluid loss additive for drilling fluid as claimed in claim 1, which is characterized in that: the alkaline substance is one or more of sodium hydroxide, potassium hydroxide, calcium hydroxide, water glass and ammonia water.
3. The environment-friendly temperature-resistant and salt-tolerant amine-based fluid loss additive for drilling fluid as claimed in claim 1, which is characterized in that: the natural vegetable gum is one or more of linseed gum, sesbania gum, guar gum, flax gum and fenugreek gum.
4. The environment-friendly temperature-resistant salt-amine-based fluid loss additive for drilling fluid as claimed in claim 1, which is characterized in that: the additive is one or more of potassium acrylate, N- (aminopropyl) methyl potassium acrylate, 2-acrylamide-2-methyl acrylate, N-dimethyl formamide and N, N-dimethyl acetamide.
5. The environment-friendly temperature-resistant and salt-amine-based fluid loss additive for drilling fluid as claimed in claim 1, wherein the additive comprises: the heating reaction temperature is 80-120 ℃, and the reaction time is 20-30 h.
6. The method for preparing the environment-friendly temperature-resistant and salt-amine-based fluid loss additive for drilling fluid, which is described in the claims 1-6, is characterized by comprising the following steps:
(1) Adding polyacrylonitrile and alkaline substance into water, and stirring at 80-120 deg.C for reaction for 12-20h;
(2) Dissolving natural plant gum in water, stirring at room temperature for 0.5-1.5 hr to make it fully dissolved;
(3) Adding the solution obtained in the step (2) into the reaction system obtained in the step (1), and continuously stirring and reacting for 2-5 h at the temperature of 80-120 ℃;
(4) Adding the additive into the reaction system in the step (3), and continuously stirring and reacting for 3-6 h at the temperature of 80-120 ℃;
(5) And (5) filtering, drying, crushing and sieving the reaction product obtained in the step (4) to obtain the environment-friendly temperature-resistant salt-resistant amino filtrate reducer for the drilling fluid.
7. The preparation method of the environment-friendly temperature-resistant and salt-amine-based fluid loss additive for drilling fluid according to claim 6, characterized by comprising the following steps: the drying temperature of the product in the step (5) is 80-100 ℃.
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