油基钻井液及其废弃物除油处理技术在东海探井中的应用

近几年,为解决大斜度定向井和大位移井钻井中所面临的井眼清洁困难、摩阻扭矩大、井壁不稳定等诸多难题,东海油气田的开发井开始采用油基钻井液体系,取得了良好的使用效果。油基钻井液相比于水基钻井液,抑制性更强,润滑性更好,有利于保持井壁稳定,从而降低钻具遇阻、遇卡事件的发生频率。该文首先对油基钻井液在东海油气田已钻开发井的使用情况进行分析研究,之后对油基钻井液在东海探井中的适用性与其废弃物除油处理方法的可行性进行理论研究,将在开发井中应用的油基钻井液使用工艺、方法扩展至东海的探井中加以应用。现场应用结果表明,该套工艺、方法切实可行,满足海上环保要求,保障了油基钻井液的成功使用,有利于实现东海探井安全高效钻进目标。

Application of Oil-based Drilling Fluid and Its Waste Oil Removal and Treatment Technology in the East China Sea Exploration Wells

In recent years, oil-based drilling fluid system has been adopted in the East China Sea development wells to solve many problems, such as difficulty in wellbore cleaning, high friction and torque, wellbore instability in high angle directional wells and extended reach wells. Compared with water-based drilling fluid, oil-based drilling fluid has stronger inhibition and better lubricity, which is conducive to maintaining wellbore stability and reducing the occurrence frequency of drilling tool sticking accidents.Firstly, the drilled development wells using oil-base drilling fluid in the East China Sea oil and gas fields were analyzed and studied, and then the applicability of oil-base drilling fluid in the East China Sea exploration wells and its waste oil removal and treatment methods were studied theoretically, and a set of oil-based drilling fluid application process and method suitable for the East China Sea exploration wells were summarized. The results of field application show that this set of technology is feasible, meets the requirements of offshore environmental protection, and is conducive to achieving the safe and efficient drilling target of exploration wells in the East China Sea.