“…Although cement contamination by OBMs is widely understood to be a problem, producing rheological variations, shortened thickening times and reduced strength (Morris and Motley., 1973;Al Khayyat et al, 1999;Fakhreldin et al, 2011;Aughenbaugh et al, 2014), little research has been done in recent years to describe the underlying mechanisms and identify comprehensive solutions. Most of the work done on this topic either by researching effectively spacer fluid to prevent contamination or adding appropriate additives in cement slurry and drilling fluid to improve the compatibility between cement slurry and mud (Brothers and deBlanc, 1989;Skalle et al, 1991;Harder et al, 1993a,b;Fleming et al, 1998;Salehi et al, 2009;Budiawan et al, 2014;Shahvali et al, 2014;He et al, 2014;Farahani et al, 2014;Velayati et al, 2015;Teodoriu and Asamba, 2015;Ariyanti et al, 2015).…”