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低密度水包白油钻井液在潜山欠平衡钻井中的应用

Chuanbing LV,Qingli MENG,Guoxing ZHANG,Haibiao LI,Jianping WEN,Huijun HAO,Huamin YU,Fengyu WANG,Deqing LIU,Yanmei LIU,Qingling LIU

Drilling Fluid and Completion Fluid（2009）

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Abstract
华北油田潜山油藏埋藏深,井下温度高,地层压力系数低.为满足该油藏欠平衡钻井的需要,研究出了高油水比水包白油钻井液.经现场应用表明,该钻井液性能稳定,最低密度为0.86 g/cm3,具有强抑制性和防泥岩坍塌能力,与清水的相对膨胀率仅为9.84%,抗温达180℃,抗污染能力好,对储层的损害小,渗透率恢复值大干94%,且较纯油基钻井液成本低,对环境污染小.长6、任东2和衡6探井通过应用该低密度水包白油钻井液,实现了欠平衡钻井,顺利钻穿漏失严重的潜山储层.较好地保护了储层,同时解决了钻井液的抗高温和荧光干扰问题,满足了探井施工录井的要求.
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Key words
Buried hill reservoir,Contamination tolerant,Environmental protection,Low density drilling fluid,Low fluorescence,Oil-in-water drilling fluid,Temperature stability,Under-balanced drilling
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