caa a22 4500 606225919 CHVBK 20210128101150.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s10553-015-0575-z doi (NATIONALLICENCE)springer-10.1007/s10553-015-0575-z Development of a Drilling Fluid with High Calcium and Salt Tolerance [Elektronische Daten] [Li Hui, Wang Yan, Wang Juan, Luo Zhongming] When complex formations consisting of anhydrite and salt are drilled, conventional drilling fluid gets readily polluted by anhydrite and salt, leading to reduced fluid performance and viscosity, and even to accidents. In this work, a waterbased drilling fluid system with high calcium and salt tolerance has been developed and its rheological properties, circulating capacity, heat resistance, salt tolerance, calcium tolerance, and solid phase endurance have been calculated. The composition of this system is 3% bentonite + 0.3% Na2CO3 + 5% pregelatinized starch + 0.02% NaOH + 0.3% KRAM + 0.6% PACLV + 0.2% XC + 1% SPF2 + 25% salt. The results show that the performance of this fluid system is stable and its ability to resist pollution is high. Springer Science+Business Media New York, 2015 waterbased drilling fluid nationallicence calcium tolerance nationallicence anhydrite nationallicence salt tolerance nationallicence rheological properties nationallicence unsaturated salt water nationallicence viscosity reduction nationallicence Hui Li College of Earth Science and Resources, Chang'an University, Xi'an, China aut Yan Wang College of Materials, Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu, China aut Juan Wang Research Institute of Petroleum Exploration and Development, Chuanquing Oilfield Company, Chengdu, China aut Zhongming Luo Research Institute of Petroleum Exploration and Development, Chuanquing Oilfield Company, Chengdu, China aut Chemistry and Technology of Fuels and Oils Springer US; http://www.springer-ny.com 51/1(2015-03-01), 61-65 0009-3092 51:1<61 2015 51 10553 https://doi.org/10.1007/s10553-015-0575-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10553-015-0575-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hui Li College of Earth Science and Resources, Chang'an University, Xi'an, China aut NATIONALLICENCE 700 1- Yan Wang College of Materials, Chemistry and Chemical Engineering, Chengdu University of Technology, Chengdu, China aut NATIONALLICENCE 700 1- Juan Wang Research Institute of Petroleum Exploration and Development, Chuanquing Oilfield Company, Chengdu, China aut NATIONALLICENCE 700 1- Zhongming Luo Research Institute of Petroleum Exploration and Development, Chuanquing Oilfield Company, Chengdu, China aut NATIONALLICENCE 773 0- Chemistry and Technology of Fuels and Oils Springer US; http://www.springer-ny.com 51/1(2015-03-01), 61-65 0009-3092 51:1<61 2015 51 10553