【摘 要】
：
Low temperature is the key for maintaining the wellbore stability of the gas hydrate well and for ensuring the safety in the well. In this article, the characte
【机 构】
：
Faculty of Engineering
【基金项目】
：
the New Century Excellent Talent Supporting Program of Ministry of Education of China;国家自然科学基金;the Excellent Young Teachers Sponsored Program of CUG;中国博士后科学基金
论文部分内容阅读
Low temperature is the key for maintaining the wellbore stability of the gas hydrate well and for ensuring the safety in the well. In this article, the characteristics of drilling in the permafrost containing gas hydrates are analyzed initially. And later, the relative properties and the inhibitory mech anisms of the polyethylene glycol and the hydrate inhibitor of the drilling fluids ensuring drilling safety are discussed. On the basis of these, the effects of the molecular weight and the content of the polyethy lene glycol, and its interaction with the salts on the performances of the four groups of drilling fluids un der low temperature are mainly analyzed. The results of these analyses show that for the relative drilling fluid system, the 5％ content of polyethylene glycol with a molecular weight of 10 000 combined with 15％ NaCl+5％ KCl or 20％ NaCl is suitable.
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