防冻型纳米乳化石蜡PF-EPF的研制与应用  

Development and Application of Antifreeze Nano Emulsified Paraffin PF-EPF

作　　者：赵春花[1] 夏小春[1] 项涛[1] 耿铁[1] 苗海龙[1] 

机构地区：[1]中海油田服务股份有限公司油田化学研究院,河北燕郊065201

出　　处：《钻井液与完井液》2016年第5期9-14,共6页Drilling Fluid & Completion Fluid

摘　　要：为解决普通纳米石蜡乳液低温下易析出石蜡并凝结成固态,导致钻井现场无法正常应用的问题,选用液体石蜡作内相,多元醇水溶液为外相,在复合乳化剂的作用下,通过合适的乳化分散工艺（相转变组分法）,制备了一种防冻型纳米乳化石蜡PF-EPF。通过室内实验,研究了水相、表面活性剂的HLB值、含量、乳化温度和油相含量等因素对PF-EPF性能的影响,得到了适宜的制备工艺,即多元醇溶液质量分数为50%～70%,体系的HLB值在10左右,油剂比为1∶1,乳化温度为80℃,体系的油相含量在30%左右,在此条件下制备的乳化石蜡PF-EPF平均粒径在160 nm左右,凝固点最低达到-30℃,防冻能力突出,并具有良好的稳定性。加入2%PF-EPF以后,海水基浆的PPT滤失量（砂盘孔径为5μm）从18.8 mL减少到10 mL左右,加入3%PE-EPF后使PEC钻井液的PPT滤失量从17.2 mL减少到6.4 mL。评价实验表明,PE-EPF能够明显提高钻井液的封堵性,起到防止井塌、提高钻速和保护油气层的作用。该剂在渤海区域CFD6-4-6D井也取得了很好的应用效果,应用前景广阔。An anti-freezing nano emulsified paraffin, PF-EPF, was prepared through multi-component phase transition method, using liquid paraffin as internal phase and water solution of polyhydric alcohol as external phase. A compound emulsifier was added to accelerate the reaction. Parameters affecting the performance of PF-EPF, such as the HLB value and content of surfactant, emulsification temperature, and the content of oil phase were studied, demonstrating that the freezing point of PF-EPF reached-30 ℃, and thus had good stability and excellent anti-freezing capability. Conventional nano paraffins, when used at low temperatures, always separates out and coagulates, making them difficult to use in drilling. The PF-EPF was synthesized to solve this problem. Compared with conventional nano-paraffin emulsions, the percent of successfully controlling seepage loss with PF-EPF treated mud was increased by45%, indicating that PF-EPF has better plugging and sealing performance. In field use, PF-EPF has showed its capacity in preventing borehole instability, increasing ROP, and protecting reservoirs. Apart from its use in petroleum engineering, this research work also helps widen the use of nano emulsions in cosmetic, medicine, food and agricultural fields.

关 键 词：封堵 纳米乳化石蜡 多元醇 复合乳化剂 相转变组分法 

分 类 号：TE254.4[石油与天然气工程—油气井工程]