表面修饰材料制备疏水油井水泥的性能评价

Performance Evaluation of Hydrophobic Oil Well Cement Prepared by Surface Modification Materials

冯明月 杨 旭 谢恬静 冯志刚 朱丽莲 李昭滢

FENG Mingyue，YANG Xu，XIE Tianjing，FENG Zhigang，ZHU Lilian，LI Zhaoying

为使油酸在水泥中分布均匀而获得性能优良的疏水油井水泥，先利用疏水物质油酸对载体石英砂进行表 面修饰，再将修饰后的石英砂引入水泥制备OA-1水泥，并测试水泥试块整体的润湿性和抗压强度，同时与在水 泥中直接添加油酸制备的OA-2水泥和利用异丙醇溶解油酸制备的OA-3水泥进行了对比，并通过SEM和XRD 表征疏水水泥材料的微观结构和化学成分。研究结果表明，具有最佳疏水效果的是油酸加量为5%的OA-1水 泥，所测水接触角的平均值可达145.18°，养护3 d后的抗压强度大于21 MPa，且与空白水泥相比，水相渗透率明 显降低，平均渗透率变化率为77.87%，而油相渗透率明显增高，平均渗透率变化率为32.14%，表明OA-1水泥具 有选择性堵水效果，可达到稳油控水的目的。在不使用互溶剂的情况下，利用石英砂作为载体，将油酸包裹石英 砂可实现油酸在水泥中的均匀分布，从而获得疏水油井水泥。

In order to make oleic acid evenly distributed in cement and prepare the hydrophilic cement material，the carrier quartz sand was modified by the hydrophobic material oleic acid，and OA-1 cement was obtained by introducing the modified quartz sand， and the overall wettability and compressive strength of cement test block was tested. At the same time，it was compared with OA-2 and OA-3 cement prepared by the direct addition of oleic acid and the dissolution of oleic acid with isopropanol，respectively. The microstructure and chemical composition of hydrophobic cement materials were characterized by SEM and XRD. The results showed that the average value of the contact angle of water on the OA-1 cement with oleic acid content of 5% could reach up to 145.18 °，indicating that the OA-1 cement had best hydrophobic effect. The compressive strength of the OA-I cement after curing for 3 days was greater than 21 MPa. Compared with that of blank cement，the water permeability of the OA-1 cement increased obviously，the average change rate was 77.87%，while the oil permeability of the OA-1 cement decreased obviously，the average change rate was 32.14%. OA-1 cement had selective water plugging effect and could achieve the purpose of oil stabilization and water control. Using quartz sand as a carrier，the oleic acid was wrapped in the surface of quartz sand without solvents，a uniform distribution of oleic acid could be achieved in the cement，thereby obtaining hydrophobic well cement.

10.19346/j.cnki.1000-4092.2022.03.006