一种油基钻井液用随钻封堵剂及其制备方法

Plugging agent while drilling for oil-based drilling fluids, and preparation method thereof

Abstract

本发明公开了一种油基钻井液用随钻封堵剂包括:疏水改性淀粉50~100重量份,疏水改性碳酸钙200~300重量份,同时给出的制备方法是:(1)将疏水改性淀粉和疏水改性碳酸钙混匀后加入到反应器中;(2)在反应器中加入100~200重量份乙醇,用氮气除去反应器中的空气后,密闭反应器;(3)将反应器温度升至120~150℃,通氮气保护,控制搅拌速度200~500转/分钟,使反应器中的疏水改性淀粉、疏水改性碳酸钙在乙醇的作用下开始反应,反应时间持续60~120分钟;(4)将反应后的产物冷却至室温后干燥、粉碎、过筛,即得油基钻井液用随钻封堵剂产品。该油基钻井液用随钻封堵剂具有抗温性较强、随钻封堵效果突出、对油基钻井液性能影响小,无生物毒性降解的特点。
The invention discloses a plugging agent while drilling for oil-based drilling fluids. The plugging agent while drilling comprises, by weight, 50-100 parts of hydrophobically modified starch and 200-300 parts of hydrophobically modified calcium carbonate. A preparation method of the plugging agent while drilling comprises the following steps: 1, uniformly mixing the hydrophobically modified starch with the hydrophobically modified calcium carbonate, and adding the obtained mixture into a reactor; 2, adding 100-200 parts by weight of ethanol into the reactor, using nitrogen to remove air in the reactor, and closing the reactor; 3, heating the reactor to make the temperature rise to 120-150DEG C, introducing nitrogen to protect, and reacting the hydrophobically modified starch with the hydrophobically modified calcium carbonate under the action of ethanol under a stirring speed of 200-500r/min for 60-120min; and 4, cooling a product obtained after the above reaction to room temperature, crushing the product, and sieving the product to obtain the plugging agent while drilling for oil-based drilling fluids. The plugging agent while drilling for oil-based drilling fluids has the characteristics of strong temperature resistance, protruding plugging effect while drilling, small influence on the performances of the oil-based drilling fluids, and no biological toxic degradation.

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