复合植物酚改善淀粉类钻井液处理剂的抗温性能

以富含植物“三素”的橘皮粉和土豆淀粉为原料，制备了橘皮粉-淀粉复合物。通过考察添加橘皮粉-淀粉复合物的水基钻井液表观黏度、动切力、降滤失性能和黏附系数，探讨改善淀粉类钻井液处理剂的抗温性能，同时利用粒径分析、红外光谱分析以及热重分析等手段分析了该复合物在钻井液中的作用机制。结果表明，在水基钻井液中添加0.3%橘皮粉（80～120目）和1.0%土豆淀粉，其在150℃下的耐温流变性能、降滤失性能和润滑性能均有明显的改善。其作用机理是橘皮粉中的植物酚能与土豆淀粉中的a多糖形成酚-多糖复合物，有效地抑制了淀粉中多糖分子链主键的高温降解，从而有效改善了淀粉类钻井液处理剂的耐温性能；同时淀粉多糖分子上的环醇羟基、橘皮酚分子上的酚羟基吸附在钻井液中膨润土颗粒的表面，形成水化膜，抑制了膨润土的水化膨胀。 

Improve High Temperature Performance of Drilling Starch with Compound Phytophenol

A citrus peel power-starch compound was developed with raw materials citrus peel power and potato starch. A drilling fluid treated with the compound was measured for its apparent viscosity, yield point, filtration control property and adhesion coefficient to find a way of improving the high temperature performance of starch drilling fluids. The working mechanisms of the compound in the drilling fluid was analyzed by particle size measurement, infrared spectrum analysis and thermogravimetric analysis. It was found that a water base drilling fluid treated with 0.3% citrus peel powder (80-120 mesh) and 1.0% potato starch had its high temperature stability at 150℃, filtration control performance and lubricity significantly improved. The working mechanisms are that the phytophenol in the citrus peel powder react with the α polysaccharide in the potato starch to form a phenol-polysaccharide compound which effectively inhibits the high temperature degradation of the backbone of the molecular chains of the polysaccharide in the starch, thereby effectively improving the high temperature resistance of starch. Meanwhile, the hydroxyl group of the cyclohydrin in the polysaccharide molecules and the phenolic hydroxyl group of the phytophenol are able to be adsorbed on the surfaces of bentonite particles in the drilling fluid, forming a hydration membrane, hence inhibiting the hydration and swelling of bentonite.