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A kind of hydrophobic association modified starch thickener and preparation method thereof

A technology of hydrophobic association and thickening agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of not developing high-temperature viscosity-reducing agent, high-temperature viscosity-reducing and high-temperature thickening of drilling fluid, etc. Achieve the effects of promoting hydrodynamic volume, fast response speed, and improving viscosification effect

Active Publication Date: 2019-08-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the amount of tackifier added is large, high temperature thickening will occur, and in severe cases, gelation will occur
The common solution is to use a high-temperature high-efficiency viscosity reducer, but so far no truly effective high-temperature anti-viscosity reducer that can fully meet the process requirements has been developed; reducing the clay content in drilling fluid is also a method to solve the gelation phenomenon , but if the clay content drops to a certain lower limit, the drilling fluid at high temperature will produce high temperature viscosity reduction phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1. Add 22.32g of acrylamide, 14.22g of sodium acrylate, 57.31g of 2-acrylamido-2-methylpropanesulfonate, 7.93g of ethylene glycol dimethacrylate and 900mL of distilled water into the container, and stir until The monomer is completely dissolved. Add 2.06g trifluorooctyl acrylate and 20.47g sodium octadecylsulfonate, stir well until the solution is clear, and set aside;

[0024] Step 2: Add 300g of cornstarch and 1700mL of distilled water into the reactor equipped with a stirrer, reflux condenser and dropping funnel, place in a constant temperature water bath, stir and disperse, heat up to a gelatinization temperature of 85°C, and continue to gelatinize for 30 minute;

[0025] Step 3. Put the mixed monomer solution obtained in Step 1 into the dropping funnel in Step 2, pass nitrogen gas and keep stirring, and adjust the temperature to the predetermined reaction temperature of 55°C;

[0026] Step 4, add 0.3g K in the reactor 2 S 2 o 8 , and open the dropping fun...

Embodiment 2

[0030] Step 1. Add 19.83g of N,N-dimethylacrylamide, 21.61g of sodium methacrylate, 61.85g of sodium p-styrenesulfonate, 7.7g of N,N-methylenebisacrylamide and 629mL of distilled water into the container, Stir until the monomers are completely dissolved. Add 2.37g trifluorooctyl methacrylate and 47.38g Span 80, stir well until the solution is clear, set aside;

[0031] Step 2: Add 554.95g of cornstarch and 4994mL of distilled water into the reactor equipped with agitator, reflux condenser and dropping funnel, place in a constant temperature water bath, stir and disperse, heat up to the gelatinization temperature of 75°C, and continue to gelatinize 60 minutes;

[0032] Step 3. Put the mixed monomer solution obtained in Step 1 into the dropping funnel in Step 2, pass nitrogen gas and keep stirring, and adjust the temperature to 56°C;

[0033] Step 4: Add 0.45 g of azobisisobutylamidine hydrochloride to the reactor, and open the dropping funnel at the same time, so that the mix...

Embodiment 3

[0037] Step 1. Add 50.55g of N-methylolacrylamide, 18.8g of sodium acrylate, 34.15g of 2-acrylamido sodium dodecylsulfonate, 6.8g of ethylene glycol diacrylate and 2095mL of distilled water into the container, and stir until The monomer is completely dissolved. Add 1.17 g of trifluorooctyl acrylate and 45.03 g of sodium octadecylbenzene sulfonate, stir well until the solution is clear, and set aside.

[0038]Step 2: Add 110.3g of starch and 992.7mL of distilled water into the reactor equipped with a stirrer, reflux condenser and dropping funnel, place in a constant temperature water bath, stir and disperse, heat up to a gelatinization temperature of 80°C, and continue to gelatinize 45 minutes.

[0039] Step 3. Put the mixed monomer solution obtained in Step 1 into the dropping funnel in Step 2, pass nitrogen gas and keep stirring, and adjust the temperature to 44°C;

[0040] Step 4, add 0.2206g of azobisisopropylimidazoline hydrochloride into the reactor, and open the droppi...

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Abstract

The invention discloses a hydrophobic association modified starch tackifier and a preparation method thereof. The tackifier is composed of starch, alkenyl amide, sodium alkenyl carboxylate, sodium alkenyl sulfonate, a crosslinking agent and fluorocarbon The hydrophobic monomer of the group is a kind of starch graft copolymer produced by the reaction of raw materials, wherein the molar ratio of alkenyl amide, alkenyl sodium carboxylate, alkenyl sodium sulfonate and crosslinking agent is 20‑50:10‑20 : 10‑30: 2‑5; the molar ratio of the sum of alkenyl amide, sodium alkenyl carboxylate, sodium alkenyl sulfonate and crosslinking agent to the hydrophobic monomer containing fluorocarbon groups is 300: 1‑3; the production method is: step 1, add raw materials in the container, and set aside; step 2, gelatinize; step 3, stir; step 4, add the first part of the initiator; step 5, add the second part of the initiator; 6. Obtain the target product. Beneficial effects: the tackifier provided by the invention is a natural modified polymer with strong hydrophobic association. The preparation method is suitable for industrial application and popularization.

Description

technical field [0001] The invention relates to a thickener and a preparation method thereof, in particular to a hydrophobic association modified starch thickener and a preparation method thereof. Background technique [0002] At present, drilling fluid refers to the general term of various circulating fluids that meet the needs of drilling work with multiple functions in the process of oil and gas drilling. Cleaning the bottom of the well and carrying cuttings out of the well is one of the important functions of the drilling fluid. In the development of normal temperature shallow wells, it is generally only necessary to add a certain amount of clay and / or a certain amount of viscosifier to give the drilling fluid a strong suspension. ability to meet the needs of drilling construction, and in the drilling process of high-temperature deep wells, with the increase of well temperature, the ability of drilling fluid to suspend cuttings is often increased by increasing the amount...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/58C08F222/14C08F212/14C08F220/54C08F222/38C09K8/035
CPCC09K8/035C08F251/00C08F220/585C08F212/14C08F220/58
Inventor 穆国臣葛春梅张天笑李继茂马艳超陈玉平陈业鹏陈晓峰贾志刚
Owner CHINA PETROLEUM & CHEM CORP
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