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Double-liquid-phase acid liquid thickening agent and preparation method thereof

An acid thickener, two-phase technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient product performance, low viscosity of acid thickener, etc., to improve rigidity, The effect of stable reaction process and improved temperature resistance

Active Publication Date: 2021-08-31
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application CN201310517324.8 discloses an instant acid thickener and its preparation method and application. The instant acid thickener prepared by the patent application has good acid and temperature resistance, and the instant acid thickener The thickened acid formulated with hydrochloric acid can ensure a viscosity of 50mPa·s, and the viscosity loss rate is less than 10% at 90°C, but the viscosity of the obtained acid thickener product is too low, resulting in unstable product performance problem; Chinese patent application CN201710193249.2 discloses a water-in-oil association type acidified thickener and its preparation method, and the viscosity of the water-in-oil association type acidified thickener provided by the patent application can reach 90mPa s, the acid dissolution time is within 3 minutes, the thermal stability can reach about 85%, and the shear stability can reach about 84%, but its thermal stability and shear resistance need to be further improved

Method used

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  • Double-liquid-phase acid liquid thickening agent and preparation method thereof
  • Double-liquid-phase acid liquid thickening agent and preparation method thereof
  • Double-liquid-phase acid liquid thickening agent and preparation method thereof

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preparation example Construction

[0030] The present invention provides a kind of preparation method of two-liquid phase acid thickener in the first aspect, described method comprises the steps:

[0031](1) Mix acrylamide, methacryloylpropyltrimethylammonium chloride, dimethyldiallylammonium chloride, salt-resistant monomer, temperature-sensitive monomer, hydrophobic monomer, chain extender and water Mix uniformly to obtain a first mixed liquid, then add an oxidizing initiator to the first mixed liquid and mix uniformly to obtain a reaction phase A; in step (1), the acrylamide, the methacryl Propyl trimethyl ammonium chloride, the dimethyl diallyl ammonium chloride, the salt-resistant monomer, the temperature-sensitive monomer, the hydrophobic monomer, the chain extender, the The mass ratio of water and the oxidizing initiator is (1~2): (24~28): (2~5): (0.7~1): (0.2~0.4): (0.14~0.15): (0.0001 ~0.0002): (6~7): (0.002~0.004); in some specific embodiments, the preparation of the reaction phase A is, for example:...

Embodiment 1

[0053] ①Preparation of reaction phase A: Add 69g of deionized water to the batching kettle, add 10g of acrylamide monomer, 275g of methacryloylpropyltrimethylammonium chloride, and 22g of dimethyldiallylammonium chloride in sequence , Sodium 2-acrylamido-2-methylpropanesulfonate (salt-resistant monomer) 8.8g, N-phenylacrylamide (temperature-sensitive monomer) 2.9g, hydrophobic monomer 1.48g, polyethylene glycol di Acrylate (chain extender) 0.002g, stir well, dissolve evenly, then use adipic acid to adjust the pH value to 3.8; finally add potassium persulfate (oxidative initiator) 0.03g, mix and stir evenly to obtain reaction phase A.

[0054] ②Preparation of reaction phase B: Add 74g of deionized water into the batching kettle, add 10.5g of acrylamide monomer, 155g of methacryloylpropyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride 80g, sodium 2-acrylamido-2-methylpropanesulfonate (salt-resistant monomer) 9.8g, N-phenylacrylamide (temperature-sensitive monome...

Embodiment 2

[0063]①Preparation of reaction phase A: add 69.5g of deionized water to the batching kettle, add 19g of acrylamide monomer, 265g of methacryloylpropyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride 25g, sodium 3-allyloxy-2-hydroxy-1-propanesulfonate (salt-resistant monomer) 8.5g, N-vinylpyrrolidone (temperature-sensitive monomer) 3.5g, hydrophobic monomer 1.5g, polypropylene glycol Diacrylate (chain extender) 0.0012g, stir well, dissolve evenly, then use adipic acid to adjust the pH value to 3.9, finally add ammonium persulfate (oxidative initiator) 0.035g, mix and stir evenly, and obtain reaction phase A .

[0064] ②Preparation of reaction phase B: Add 81g of deionized water to the batching kettle, add 25g of acrylamide monomer, 165g of methacryloylpropyltrimethylammonium chloride, and 85g of dimethyldiallylammonium chloride in sequence , Sodium 3-allyloxy-2-hydroxy-1-propanesulfonate (salt-resistant monomer) 9g, N-vinylpyrrolidone (temperature-sensitive mon...

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Abstract

The invention relates to a double-liquid-phase acid liquid thickening agent and a preparation method thereof, and belongs to the technical field of oilfield chemistry and engineering. The method comprises the steps: firstly, dissolving acrylamide, methacryloyl propyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride, a salt-resistant monomer, a temperature-sensitive monomer, a hydrophobic monomer and a chain extender in deionized water according to different mass ratios, and stirring to respectively prepare a reaction phase A and a reaction phase B; uniformly mixing the compound emulsifier and the oil solvent to obtain a continuous phase; and adding the reaction phase A into the continuous phase to initiate a polymerization reaction, and then adding the reaction phase B to initiate a polymerization reaction, so as to obtain the double-liquid-phase acid liquid thickening agent, wherein 2-vinyl-1H-benzimidazole and bromohexadecane are subjected to a reaction in an acetone solvent, and the hydrophobic monomer is prepared. The acid liquor thickening agent prepared by the method has the advantages of high dissolution speed, temperature resistance, acid resistance and excellent shear resistance, and can still keep the viscosity stability in acid liquor prepared from tap water under a high-temperature condition.

Description

technical field [0001] The invention relates to the field of oilfield chemistry and engineering technology, in particular to a two-liquid-phase acid thickener and a preparation method thereof, in particular to a kind of acidizing fracturing agent suitable for unconventional shale gas and tight oil and gas exploitation. A two-liquid-phase acid thickener for cracking operations and a preparation method thereof. Background technique [0002] The main function of reservoir stimulation (acidification, fracturing) is to reduce the damage of the formation near the wellbore, increase the permeability of oil and gas layers, and thus increase the single well production. After entering the 21st century, reservoir stimulation technology has been paid more and more attention. Acidizing is an oil and gas well stimulation technology applied earlier. Its main principle is to use acid liquid to dissolve pollutants and minerals in the formation, and the acid etching reaction products are dis...

Claims

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Application Information

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IPC IPC(8): C08F220/34C08F220/56C08F226/02C08F220/58C08F220/54C08F216/14C08F226/10C09K8/74
CPCC08F220/34C09K8/725C09K8/74C08F220/56C08F226/02C08F220/585C08F220/54C08F216/1475C08F226/10
Inventor 荣敏杰王成辉许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH