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A kind of preparation method of starch graft copolymer inverse emulsion for drilling fluid

A technology of starch grafting and inverse emulsion, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of affecting the use effect of the product, cannot be added uniformly, and is inconvenient to use, and achieves the ability to inhibit hydration and dispersion. , Fast dispersing and dissolving speed, good effect

Active Publication Date: 2017-11-17
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 g of sorbitan oleate to 120 ml of white oil, stir to dissolve, and pass nitrogen for 10 min to obtain an oil phase. Dissolve 4.25 g of potassium hydroxide in 140 ml of water, then slowly add 15 g of 2-acrylamido-2-methylpropane sulfonic acid, cool down to room temperature after the addition is complete, and add 65 g of acrylamide under stirring , 5 g vinylpyrrolidone, 5 g methacryloyloxyethyl trimethyl ammonium chloride, 1.85 g polyoxyethylene sorbitan fatty acid ester, 0.0075 g EDTA disodium salt, 10 g starch , and the water phase is obtained after stirring evenly. Slowly add the water phase to the oil phase, after fully emulsification, adjust the pH value to 8 with a 40% potassium hydroxide aqueous solution, and after nitrogen is passed for 12 minutes, add 0.075 grams of initiator ammonium persulfate and 0.075 grams of reducing agent sulfite Sodium hydrogen (dissolved in an appropriate amount of water in advance), under the protection of nitrogen, stir and hea...

Embodiment 2

[0021] Add 14.7 g of sorbitan oleate to 170 ml of white oil, stir to dissolve, and pass nitrogen for 15 min to obtain an oil phase. Dissolve 7.15 g of potassium hydroxide in 160 ml of water, then slowly add 25 g of 2-acrylamido-2-methylpropane sulfonic acid, cool down to room temperature after the addition is complete, and add 35 g of acrylamide under stirring , 5 grams of vinylformamide, 5 grams of acryloyloxyethyl trimethyl ammonium chloride, 3.7 grams of polyoxyethylene sorbitan fatty acid ester, 0.015 grams of EDTA disodium salt, 30 grams of starch, After stirring evenly, the water phase was obtained. Slowly add the water phase to the oil phase, after fully emulsification, adjust the pH value to 10 with a 40% potassium hydroxide aqueous solution, and after nitrogen is passed 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 pro...

Embodiment 3

[0023] Add 13.75 g of sorbitan oleate to 160 ml of white oil, stir to dissolve and pass nitrogen for 14 min to obtain an oil phase. Dissolve 5.68 g of potassium hydroxide in 160 ml of water, then slowly add 20 g of 2-acrylamido-2-methylpropane sulfonic acid, cool down to room temperature after the addition is complete, and add 40 g of acrylamide under stirring , 10 g vinylimidazole, 5 g dimethyl diallyl ammonium chloride, 2.75 g polyoxyethylene sorbitan fatty acid ester, 0.005 g EDTA disodium salt, 25 g starch, stir well After the aqueous phase. Slowly add the water phase to the oil phase, after fully emulsification, adjust the pH value to 9 with a 40% sodium hydroxide aqueous solution, and after passing nitrogen for 15 minutes, add 0.35 grams of initiator potassium persulfate and 0.175 grams of reducing agent thiocyanate. Sodium sulfate (dissolved in an appropriate amount of water in advance), under the protection of nitrogen, stirred and heated to 40 ° C, kept at this tempe...

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Abstract

The invention relates to a method for preparing a starch graft copolymer inverse emulsion for drilling fluid, which comprises the following steps: adding an emulsifier sorbitan oleate into white oil, stirring and dissolving, and passing nitrogen to obtain an oil phase; Dissolve potassium oxide in water, add 2‑acrylamido‑2‑methylpropanesulfonic acid, acrylamide, vinyl monomer, cationic monomer, polyoxyethylene sorbitan fatty acid ester, ethylenediaminetetraacetic acid di Sodium salt, starch, stir to obtain water phase; add water phase to oil phase, fully emulsify, adjust pH value, pass nitrogen, add initiator and reducing agent, under nitrogen protection, stir to heat up, keep warm, cool down, discharge, filter The starch graft copolymer inverse emulsion for drilling fluid was obtained. As a drilling fluid treatment agent, this product has good fluid loss reduction, viscosity increase, flow regulation, and the ability to inhibit the hydration and dispersion of clay and cuttings. It can improve the quality of filter cake, improve the lubricity of drilling fluid, and reduce the cost of drilling fluid treatment. , suitable for various types of water-based drilling fluids.

Description

Technical field: [0001] The invention relates to a preparation method of 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 inexpensive and abundant, and are an important oilfield chemical. As a drilling fluid treatment agent, because of its strong salt resistance, it can be used as a fluid loss reducer for saturated brine drilling fluids, but its temperature resistance is poor, and it is easy to ferment when the bottom hole temperature is high. It is only suitable for use below 130 °C. In order to promote its promotion, multi-copolymers such as acrylamide, 2-acrylamido-2-methylpropane sulfonic 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 polyme...

Claims

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Application Information

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