库车山前超深超高压盐水层安全钻井技术探索

发布时间：2018-04-09 16:24

本文选题：超高压盐水　切入点：控压排水　出处：《钻井液与完井液》2017年01期

【摘要】：库车山前深部巨厚盐膏层地质特征复杂,层间超高压盐水普遍发育,纵横向规律性差,地层压力变化大,预测难度高。盐膏层钻井过程中超高压盐水侵入井筒后,钻井液性能恶化,导致喷、漏、卡等复杂事故频发,严重影响安全快速钻井。结合超高压盐水层钻井特征,通过分析超高压盐水赋存的圈闭特点及实钻情况,在钻井液的盐水污染容量限实验模拟和评价的基础上,开展了超高压盐水层控压排水技术的探索与实践,形成了控压排水配套新技术,通过控制节流阀调节井口回压和钻井液排量等手段,让地层盐水按一定比例均匀侵入到环空钻井液中,单次放水量不超过环空钻井液量的10%,多次放出盐水,降低高压盐水层的地层压力系数。解决了库车山前超深超高压盐水层安全钻井难题。现场试验表明,采取合理的控压排水方法能够降低盐水层的压力,在溢流与井漏的矛盾中找到压力平衡点,有利于井控安全的井筒状态。
[Abstract]:Kuche mountain deep thick salt layer geological characteristics of complex layers of ultra high pressure brine common development, and poor regularity, formation pressure changes, prediction of high difficulty. The salt gypsum layer in the drilling process of high pressure brine intruding after the deterioration of the performance of drilling fluid to spray, leakage, frequent card and other complex accident. Seriously affect the safe and fast drilling. Drilling combined with the characteristics of super high pressure brine layer traps by analyzing characteristics of ultra high pressure water storage and drilling, based on brine drilling fluid pollution capacity limit of experimental simulation and evaluation, to carry out the exploration and practice of pressure controlled drainage technology of ultra high pressure brine layer, forming a pressure controlled drainage a complete set of new technology, through the control of the throttle valve regulating the wellhead back pressure and drilling fluid displacement means for formation brine proportion uniform into the annulus fluid, the single water amount does not exceed 10% of the amount of drilling fluid annulus, multi Out of water, reduce the formation pressure coefficient of high pressure brine layer. To solve the Kuche Piedmont ultra deep and ultra high pressure brine layer safety drilling problems. Field test shows that, to take reasonable control pressure drainage method can reduce brine layer pressure, pressure to find the balance point in the contradiction between overflow and well leakage in the wellbore is conducive to well control safety state.

【作者单位】：中国石油大学(华东)石油工程学院;中国石油塔里木油田分公司;渤海钻探井下作业公司;
【分类号】：TE28

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