泥页岩微裂缝模拟新方法及封堵评价实验

发布时间：2018-05-29 01:05

本文选题：硬脆性泥页岩 + 微裂缝　；参考：《钻井液与完井液》2017年01期

【摘要】：目前泥页岩微裂缝模拟方法较多,但都存在一定局限性,且不能真实模拟高温高压下泥岩与钻井液接触后水化分散过程。针对该难题,在对平滑钢块模拟法、砂床封堵实验法、劈裂岩样人造裂缝模拟法和透明钢化玻璃模拟法进行分析的基础上,采用干法钻取取样岩心以获得标准岩心柱,对岩心柱进行造缝,并在岩心缝面垫上不同厚度的锡纸,模拟宽度为10~100μm的微裂缝;将岩心柱放入夹持器中,与动态失水仪相连,可形成一套泥岩微裂缝封堵能力评价装置。介绍了封堵评价实验装置的组装和实验操作步骤,及其功能和优点,给出了微裂缝缝宽的推导公式,并通过精确测量数据换算出了等效裂缝宽度。室内实验表明,该微裂缝模拟方法有精度高、重复性好等优点。研究结果表明,该方法及评价装置不仅能模拟泥页岩与外来液相接触后的水化分散、膨胀等过程,还能真实模拟井底高温高压条件下钻井液对微裂缝的封堵情况,为深入研究微裂缝的封堵机理、封堵材料优选及钻井液配方优选提供可靠的实验方法和数据支撑。
[Abstract]:At present, there are many simulation methods of shale micro-fracture, but all of them have some limitations, and can not simulate the hydration and dispersion process of mudstone in contact with drilling fluid under high temperature and high pressure. Based on the analysis of smooth steel block simulation method, sand bed plugging experiment method, artificial fracture simulation method of split rock sample and transparent tempered glass simulation method, sampling core is drilled by dry method to obtain standard core column. The core column is jointed, and different thickness tin foil is used on the core joint surface to simulate the microfracture with the width of 10 ~ 100 渭 m, and the core column is placed in the gripper and connected with the dynamic water loss instrument, which can form a set of mudstone micro-fracture sealing ability evaluation device. This paper introduces the assembly and operation steps of the experimental device for sealing and evaluation, and its functions and advantages, and gives the derivation formula of the crack width of the micro-crack, and converts the equivalent crack width by the accurate measurement data. Laboratory experiments show that the micro-crack simulation method has the advantages of high accuracy and good repeatability. The results show that the method and the evaluation device can not only simulate the hydration dispersion and expansion process of shale in contact with external liquid phase, but also simulate the plugging of microfractures by drilling fluid under the condition of high temperature and high pressure at bottom hole. It provides reliable experimental method and data support for further study on plugging mechanism of microfracture, optimal selection of plugging materials and optimum selection of drilling fluid formula.
【作者单位】：大庆钻探工程公司钻井工程技术研究院;
【基金】：中石油集团公司“十三五”重大科技专项“大庆油气持续有效发展关键技术研究与应用”
【分类号】：TE254

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