第33卷第5期 2016年9月
钻井液与完井液
DRILLINGFLUID&COMPLETIONFLUID
doi:10.3696/j.issn.1001-5620.2016.05.002
Vol.33 No.5 Sept.2016
防冻型纳米乳化石蜡PF-EPF的研制与应用
赵春花，夏小春，项涛，耿铁，苗海龙
（中海油田服务股份有限公司油田化学研究院，河北燕郊065201）
赵春花等.防冻型纳米乳化石蜡PF-EPF的研制与应用[].钻并液与完井液，2016，33（5)：9-14.
摘要为解决普通纳米石蜡乳液低湿下易析出石蜡并凝结成固态，导致钻并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160nm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18.8mL减少到10mL左右，加入3%PE-EPF后使PEC钻井液的PPT滤失量从17.2mL减少到6.4mL。评价实验表明， PE-EPF能够明显提高钻井液的封堵性，起到防止并填、提高钻速和保护油气层的作用。该剂在激海区域CFD6-4-6D井也取得了很好的应用效果，应用前景广阔。
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
中图分类号：TE254.4
文献标识码：A
文章编号：1001-5620（2016）05-0009-06
DevelopmentandApplicationofAntifreezeNanoEmulsifiedParaffinPF-EPF
ZHAO Chunhua, XIA Xiaochun, XIANG Tao, GENG Tie, MIAO Hailong(Oilfield Chemistry R&D Institute,COSL, Yanjiao,Sanhe,Hebei 065201)
Abstract An anti-freezing nano emulsified paraffin, PF-EPE, 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 °C, 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 by 45%, 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 engincering, this research work also helps widen the use ofnano emulsions in cosmetic, medicine,food and agricultural fields.
Key words Plugging and sealing; Nano emulsified paraffin; Polyhydric alcohol; Compound emulsifier, Multi-component phase transitionmethod
纳米乳化石蜡是以石蜡、乳化剂和水为主要原料，通过合适的乳化分散工艺制成的粒径小于500 nm的乳状液I-6]。与微乳液相比，纳米乳液乳化剂用量很低，更具实际应用价值。但是纳米乳液乳化剂有分层、沉降、絮凝、聚结或奥氏熟化等不稳定
现象；与普通乳液相比，纳米乳液液滴粒径小，分散均匀，有一定的动力学稳定性，能够在数月甚至数年内不发生明显的絮凝和聚结(7-10)。将纳米石蜡乳液作为钻井液添加剂使用时，能够明显提高钻井液泥饼的致密性，改善泥饼的厚度，起到防止井
第一作者简介：赵春花，博士，1987年生，现在主要从事油田化学方面的研究。电话18632661868/（010）84528462；
E-mail :zhaochh16@cosl.com.cn。万方数据