纳米石蜡乳液在钻井液处理剂作用下的稳定性研究  

Study on the Stability of Nano-paraffin Emulsion Under the Action of Drilling Fluid Treatment Agent

作　　者：贾瑞雪 杨梦涛 杨宏拓 李锋 李宁[5] 余志成 肖华 JIA Ruixue;YANG Mengtao;YANG Hongtuo;LI Feng;LI Ning;YU Zhicheng;XIAO Hua(Yangtze University,Wuhan,Hubei 430000,China;The Sixth Oil Production Plant of PetroChina Changqing Oilfield Branch,Dingbian,Shaanxi 718600,China;Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi′an,Shaanxi 710065,China;The Fifth Gas Production Plant of PetroChina Changqing Oilfield Branch,Ordos,Inner Mongolia 017300,China;CNPC Bohai Drilling Downhole Operations Branch,Renqiu,Hebei 062552,China;Exploration Division of PetroChina Tuha Oilfield,Hami,Xinjiang 839009,China)

机构地区：[1]长江大学 [2]中国石油长庆油田分公司第六采油厂 [3]延长石油(集团)有限责任公司研究院 [4]中国石油长庆油田分公司第五采气厂 [5]中国石油集团渤海钻探井下作业分公司 [6]中国石油吐哈油田分公司勘探事业部

出　　处：《钻采工艺》2023年第6期140-145,共6页Drilling & Production Technology

基　　金：国家自然科学基金重点项目“陆相页岩油在基质—裂缝体系中的多尺度运移机理研究”(编号:41380431)。

摘　　要：由于页岩存在微细的裂缝网络和纳米至微米尺度的孔隙度,因此使用含纳米粒子的钻井液体系对页岩裂缝进行封堵是必不可少的。本文通过粒径测试、沉降稳定性以及离心稳定性实验,研究了传统钻井液处理剂对纳米石蜡乳液性质的调控效果。实验结果表明,纳米石蜡乳液在水性介质中具有良好的稳定性,其平均粒径在60-70 nm之间,并遵循正态分布。在不同钻井液处理剂作用下,乳液的粒径和稳定性表现出显著差异。其中BPT-507抑制剂使乳液平均粒径显著增至465.97 nm,而HV-CMC增黏剂几乎不影响乳液的粒径,稳定在71 nm左右。此外,高光透过率(HV-CMC处理剂为90.7%)表明了处理剂在防止颗粒聚集方面的显著效果,进而提高了乳液的稳定性。此研究对页岩密封技术和钻井液处理剂的应用提供了理论支撑和实际指导。Due to the existence of fine fracture networks and nano-to micron-scale porosity in shale,it is essential to use drilling fluid systems containing nanoparticles to seal shale fractures.This article studied the effect of traditional drilling fluid treatment agents on the properties of nanoparaffin emulsion through particle size testing,sedimentation stability and centrifugal stability experiments.Experimental results show that nanoparaffin emulsion has good stability in aqueous medium,its average particle size is between 60-70 nm,and follows a normal distribution.Under the action of different drilling fluid treatment agents,the particle size and stability of the emulsion show significant differences.Among them,the BPT-507 inhibitor significantly increased the average particle size of the emulsion to 465.97 nm,while the HV-CMC tackifier hardly affected the particle size of the emulsion and was stable at around 71 nm.In addition,the high light transmittance(90.7%for HV-CMC treatment agent)demonstrates the significant effect of the treatment agent in preventing particle aggregation,thereby improving the stability of the emulsion.This research provides theoretical support and practical guidance for the application of shale sealing technology and drilling fluid treatment agents.

关 键 词：纳米石蜡乳液 钻井液处理剂 粒径 分散稳定性 

分 类 号：TE254.4[石油与天然气工程—油气井工程]