十八烷基三氯硅烷自组装抑水石英砂的制备及性能评价

Preparation and Performance Evaluation of Hydrophobic Quartz Sand Modified by Octadecyltrichlorosilane

齐宁 何利敏 李柏杨 刘帅 田壮壮

QI Ning HE Limin LI Boyang LIU Shuai TIAN Zhuangzhuang

为减缓疏松砂岩油藏开发过程中产出液的含水上升速度，达到改善端部脱砂压裂防砂效果的目的，采用自组装法将十八烷基三氯硅烷（OTS）用于石英砂支撑剂表面的抑水改性处理，研究了OTS浓度、浸泡时间和风干时间对OTS自组装石英砂破碎率、酸溶解度和流体阻力比（NFRR值）的影响，采用正交实验优化得到石英砂表面抑水处理的最佳条件，考察了OTS自组装石英砂的耐冲刷性，介绍了自组装分子膜成膜及抑水机理。结果表明，OTS浓度对OTS自组装抑水石英砂破碎率的影响最大，浸泡时间对酸溶解度和NFRR 值的影响最大。在OTS浓度10 mmol/L、浸泡时间1.0 h 和风干时间84 h 的条件下，OTS自组装抑水石英砂的NFRR 值最大（2.531），抑水效果最佳。OTS自组装抑水石英砂具有优良的抑水透油性能，岩心经去离子水连续冲刷5 d 后的水测渗透率基本不变，石英砂表面性质稳定，能满足改善端部脱砂压裂防砂增产的需求。图3 表5参18

In order to slow down the rising velocity of water content in production liquid during unconsolidated sandstone reservoirs development and improve the effect of tip screen out fracturing sand control，octadecyltrichlorosilane（OTS）was used to the treatment of hydrophobic modification on the surface of propping agent（quartz sand）by self-assembly method. The effect of OTS solution concentration，soaking time and air drying time on the broken rate，acid solubility and fluid resistance ratio（NFRR value） of OTS self-assembled hydrophobic quartz sand was studied. The condition of modification treatment on the surface of quartz sand was optimized by orthogonal test，the flushing resistance was determined，and the self-assembled monolayer formation mechanism and the hydrophobic mechanism were introduced. The results showed that the OTS solution concentration had the greatest influence on the broken rate while the soaking time had the greatest influence on the acid solubility and NFRR value. The NFRR value of quartz sand after soaked one hour by 10 mmol/L OTS solution and air dried 84 hrs got peak point 2.531 with the best hydrophobic result. OTS self-assembled hydrophobic quartz sand had an excellent hydrophobic performance and the water permeability of core could keep stable after 5 days scoured by deionized water. OTS self-assembled hydrophobic quartz sand had a stable surface property and it could satisfy the need of tip screen out fracturing sand control.

10.19346/j.cnki.1000-4092.2016.03.014