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科技导报  2014 

钻井液密度对裂缝性泥页岩地层坍塌压力影响的力化耦合研究

DOI: 10.3981/j.issn.1000-7857.2014.25.006, PP. 40-45

Keywords: 裂缝,渗流,水化,坍塌压力,钻井液密度

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Abstract:

缝性地层井壁失稳是钻井工程中经常遇到工程难题之一,裂缝发育地层常伴随严重的井壁坍塌,具有水化性质的裂缝性地层在钻井液侵入后更易发生坍塌。扫描电镜观察某油田泥页岩发育的层理实际为尺寸极小的微裂缝,使用XRD衍射仪测定了该泥页岩黏土矿物质量分数为30%~40%,泥页岩水化性质较强。通过剪切实验测定了泥页岩吸水后的抗剪强度,求解了不同含水量裂缝面的黏聚力及内摩擦角。建立了钻井液滤液向地层内的渗流方程及裂缝性地层坍塌压力方程,计算了不同钻井液密度和浸泡时间的坍塌压力。计算结果表明,高钻井液密度导致钻井液滤液向裂缝内加速渗流,裂缝面强度降低导致地层更加容易坍塌。裂缝性地层井壁失稳不宜提高钻井液密度稳定井壁,应采用措施提高钻井液封堵性及抑制性,降低钻井液滤液侵入量。

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