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Research and Application of Biodiesel-based Drilling Fluid

SUN Mingbo,QIAO Jun,LIU Baofeng,LI Haibin,MOU Shunquan College of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266555,China  
Considering the problems of common oil-based drilling fluid,such as high cost,environmental pollution and potentially safety hazard,the biodiesel-based drilling fluid system is developed.The optimum formulation is biodiesel+3% organic bentonite+1.5% SP-80+1% OP-10+2% Organic-lignite+2% oil soluble resin.The evaluation results show that this drilling fluid system has good performances of high temperature stability(220 ℃) and anti-pollution abilities(3% Ca2+,10% NaCl and 10% bentonite).Biological toxicity test shows that the LC50 of biodiesel based drilling fluid system is 36,114 mg/L that is higher than the discharge standard.The biodiesel based drilling fluid system is successfully applied in well of BoyeH1-2 in ShengLi oilfield.
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