基于OTS-SAM技术的疏水石英砂支撑剂的制备及性能评价

Preparation and performance evaluation of hydrophobic quartz sand treated by OTS-SAM technology

采用十八烷基三氯硅烷(OTS)在石英砂表面形成单分子自组装膜(SAM)的技术制备了支撑剂疏水石英砂DH-1,该支撑剂具有良好的疏水能力,优于常规抑水砂PX-1和空白石英砂。同时,开展了不同支撑剂在去离子水、煤油、某油田采出原油及返排水等介质中的渗透率实验,结果表明,疏水石英砂DH-1对返排水的渗透率显著低于常规抑水砂和空白石英砂,疏水石英砂DH-1对原油的渗透率略低于空白砂。疏水石英砂DH-1在20℃/2 MPa、60℃/8 MPa条件下的NRFF值分别为2.33和2.16,抑水性能优良,受储层环境的影响小。支撑剂短期导流能力实验结果表明,在相同闭合压力的条件下,疏水石英砂DH-1在煤油介质中的导流能力最大,疏水石英砂DH-1在煤油中的导流能力优于去离子水介质的导流能力。疏水石英砂DH-1在69 MPa的破碎率仅为24.2%,单颗粒抗压强度为352 MPa。

Hydrophobic quartz sand DH-1 is prepared through octadecyl trichlorosilane(OTS)forming self-assembled monolayers(SAM)on the quartz sand surface.As a proppant,DH-1 has excellent hydrophobic ability,superior to normal water-suppressive quartz sand(PX-1)and blank quartz sand.The permeability tests are performed on different proppants in deionized water,kerosene,and crude oil and backwater media from a certain oilfield.Test results show that the permeability of DH-1 to the backwater is significantly lower than that of PX-1 and blank quartz sand.The permeability of DH-1 to the crude oil is a little lower than that of blank quartz sand.NRFF value of DH-1 are 2.33 and 2.16 at 20℃/2 MPa and 60℃/8 MPa,separately,showing an excellent water inhibition ability even under different reservoir environment.Under the same closing pressure conditions,the short-term permeability of DH-1 column is the highest in kerosene media compared with its counterparts.The short-term permeability of DH-1 column in kerosene medium is higher than that in aqueous mediium.The damage percentage of DH-1 in 69 MPa is only 24.2%,and its single particle compressive strength is 352 MPa.