Preparation method of starch grafted copolymer inverse emulsion for drilling fluid

A technology of starch grafting and inverse emulsion, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the problems of affecting the use effect of products, inability to add uniformly, inconvenient use, etc., and achieve the ability to inhibit hydration and dispersion , fast dispersion and dissolution, good effect

Active Publication Date: 2013-05-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the starch graft copolymer fluid loss control agents in the published achievements are all powders. Since the powdery treatment agent is directly added to the drilling fluid when used, not only can it not be added evenly, but the dissolution rate is slow. If the dissolution time is longer than the drilling fluid cycle , the polymer particles that are not dissolved or swollen will be sieved out from the vibrating sieve, or even paste the sieve. Therefore, it is necessary to prepare a glue solution with a mass fraction of 0.5% to 2% before use. When mixing the glue solution, it will not only increase the workload , and will cause the product to shear and degrade, which is not only inconvenient to use, but also affects the use effect of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 11 grams of sorbitan oleate into 120 milliliters of white oil, stir to dissolve, and pass nitrogen for 10 minutes to obtain an oil phase. Dissolve 4.25 grams of potassium hydroxide in 140 milliliters of water, then slowly add 15 grams of 2-acrylamido-2-methylpropanesulfonic acid, cool to room temperature after it is added, add 65 grams of acrylamide under stirring , 5 grams of vinylpyrrolidone, 5 grams of methacryloyloxyethyltrimethylammonium chloride, 1.85 grams of polyoxyethylene sorbitan fatty acid ester, 0.0075 grams of edetate disodium salt, 10 grams of starch , and stir evenly to obtain an aqueous phase. Slowly add the water phase to the oil phase. After fully emulsifying, adjust the pH value to 8 with a 40% potassium hydroxide aqueous solution. After passing nitrogen for 12 minutes, add 0.075 grams of initiator ammonium persulfate and 0.075 grams of reducing agent sulfurous acid Sodium hydrogen (dissolved in an appropriate amount of water in advance), under ...

Embodiment 2

[0021] Add 14.7 g of sorbitan oleate into 170 ml of white oil, stir to dissolve, and pass nitrogen for 15 min to obtain an oil phase. Dissolve 7.15 grams of potassium hydroxide in 160 milliliters of water, then slowly add 25 grams of 2-acrylamido-2-methylpropanesulfonic acid, cool to room temperature after it is added, add 35 grams of acrylamide under stirring , 5 grams of vinylformamide, 5 grams of acryloyloxyethyltrimethylammonium chloride, 3.7 grams of polyoxyethylene sorbitan fatty acid ester, 0.015 grams of edetate disodium salt, 30 grams of starch, After stirring evenly, the aqueous phase was obtained. Slowly add the water phase to the oil phase. After fully emulsifying, adjust the pH value to 10 with a 40% potassium hydroxide aqueous solution. After passing nitrogen for 10 minutes, add 0.45 grams of initiator ammonium persulfate and 0.225 grams of reducing agent sulfurous acid Sodium hydrogen (dissolved in an appropriate amount of water in advance), under the protectio...

Embodiment 3

[0023] Add 13.75 g of sorbitan oleate into 160 ml of white oil, stir to dissolve, and pass nitrogen for 14 minutes to obtain an oil phase. Dissolve 5.68 grams of potassium hydroxide in 160 milliliters of water, then slowly add 20 grams of 2-acrylamido-2-methylpropanesulfonic acid, cool to room temperature after the addition, and add 40 grams of acrylamide under stirring , 10 grams of vinyl imidazole, 5 grams of dimethyl diallyl ammonium chloride, 2.75 grams of polyoxyethylene sorbitan fatty acid ester, 0.005 grams of edetate disodium salt, 25 grams of starch, stir well Aqueous phase was obtained. Slowly add the water phase to the oil phase. After fully emulsifying, adjust the pH value to 9 with a 40% aqueous sodium hydroxide solution by mass fraction. After passing nitrogen for 15 minutes, add 0.35 grams of initiator potassium persulfate and 0.175 grams of reducing agent thio Sodium sulfate (dissolved in an appropriate amount of water in advance), under the protection of nitr...

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PUM

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Abstract

The invention relates to a preparation method of a starch grafted copolymer inverse emulsion for a drilling fluid. The method comprises the following steps of: adding an emulsifier sorbitan monooleate into white oil, and stirring, dissolving and introducing nitrogen to obtain an oil phase; dissolving potassium hydroxide in water, adding 2-acrylamidyl-2-methyl propanesulfonic acid, acrylamide, a vinyl monomer, a cationic monomer, polyoxyethylene sorbitan monooleate, ethylene diamine tetraacetic acid disodium salt and starch, and stirring to obtain an aqueous phase; adding the aqueous phase into the oil phase, adequately emulsifying, adjusting the pH value, introducing nitrogen, adding an initiator and a reducing agent; and stirring, heating, insulating heat, cooling, discharging and filtering under nitrogen protection to obtain the starch grafted copolymer inverse emulsion for the drilling fluid. The product serving as a drilling fluid treatment agent has good de-filtration effect, good thickening effect, a flow type regulating effect and good inhibition effect for dehydrating dispersion of clay and drillings, so that the quality of filter cakes is improved, the lubricity of the drilling liquid is improved and the processing cost of the drilling liquid is lowered, and the preparation method is suitable for various types of water-based drilling fluids.

Description

Technical field: [0001] The invention relates to a method for preparing a starch graft copolymer inverse emulsion for drilling fluid, and belongs to the technical field of preparation of water-soluble polymer materials. technical background: [0002] Starch modified products are cheap and abundant, and are an important oilfield chemical. As a drilling fluid treatment agent, it can be used as a fluid loss reducer for saturated brine drilling fluid because of its strong salt resistance, but its temperature resistance is poor, and it is easy to ferment when the bottom hole temperature is high. In addition to its promotion, multi-polymers such as acrylamide, 2-acrylamido-2-methylpropanesulfonic acid (AMPS), and acrylic acid have good temperature resistance, but the cost is high, which is not conducive to promotion. The starch graft copolymer has both the salt resistance of starch and the temperature resistance of polymer products, and is low in cost, which meets the needs of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/58C08F220/56C08F2/32C09K8/035
Inventor 王中华
Owner CHINA PETROLEUM & CHEM CORP
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