钾钙基阳离子钻井液技术

Potassium and calcium based cationic drilling fluid technology

艾贵成

AI Gui-cheng

吐哈油田国际钻井公司, 甘肃玉门 735200

International Drilling Company of Tuha Oilfield, Yumen 735200, Gansu, China

青西油田强造浆泥岩段长,易出现水化膨胀导致井眼缩径、坍塌和白垩系硬脆性地层的坍塌,特别是在空气钻井结束后,还会出现钻井液污染、井塌问题,处理难度较大。通过对青西油田典型易塌层位进行X射线衍射、膨胀率和分散回收率实验分析,得出相应的防塌机理;在对空气钻雾化、泡沫配方配伍性研究的基础上,形成钾钙基阳离子钻井液;经过回收率试验、抗盐膏污染实验优化配方。现场应用表明:钾钙基阳离子钻井液配伍性好、抗污染能力强、防塌能力强、流动性好,适合青西油田钻井施工和储层保护的需要,可进一步推广应用。

The high mud making mudstone is long in Qingxi Oilfield,as well as hydration swelling easily emerges,which results in shrinkage and collapse of holes and collapse of hard and brittle formations in the Cretaceous system.In particular,it is difficult to tackle the problems that the drilling fluid may be polluted and the well may collapse during the transformation of conventional drilling fluid after air drilling.Based on the analysis of typical easily collapsed zones of the oilfield by conducting experiments on X-ray diffraction,expansion ratio,and decentralized recovery,the corresponding anti-collapse mechanism is obtained.Potassium and calcium based cationic drilling fluid is developed on the basis of the study on the atomization of air drilling and the compatibility of foam formulation.The formulation is optimized by carrying out recovery test and test on resistibility to salt-gypsum contamination.Field application shows that potassium and calcium based cationic drilling fluid features in good compatibility,strong anti-pollution capacity,high capacity to prevent from collapse,and excellent fluidity,and can fulfill the requirements of drilling construction and reservoir protection of Qingxi Oilfield.It can be further popularized.

10.3969/j.issn.1000-7393.2007.04.025