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本文提出了一种方法,可用于钻井液和套管设计,以及钻穿很深的厚盐层的钻井方案。应用所开发的室内有限元代码可以完成数值模拟,以评价在高应力差、高温下盐岩(岩盐、杂盐、准水合物)的蠕变特性。对高蠕变速率、厚达2000m的各种蒸发岩的勘探进行了数值模拟,应用获得的结果对不同钻井液中井眼闭合度随时间的变化规律进行了预测,并对几种钻井方案进行了可行性分析。针对盐岩中固井失败的几种情况,完成了套管设计和环空钻井液设计,以确定不均匀载荷和盐层载荷时限对油井套管变形的影响。所设计的套管能够承受杂盐和准水合物的高蠕变速率。
This paper presents a method that can be used for drilling fluid and casing design as well as drilling programs that drill deep thick salt formations. Numerical simulations can be performed using the developed indoor finite element code to evaluate the creep characteristics of rock salt (rock salt, salt, hydrate) at high stress and temperature. The exploration of various evaporites with high creep rate and thickness up to 2000m was simulated. The results obtained were used to predict the variation of borehole closure degree with time in different drilling fluids. Several drilling schemes were carried out Feasibility Analysis. Aiming at several cases of cementing failure in salt rock, casing design and annulus drilling fluid design were completed to determine the effect of uneven load and salt loading time on well casing deformation. The designed casing is able to withstand the high creep rates of salt mixed and quasi-hydrates.