Experimental study and modeling of water-based fluid imbibition process in Middle and Lower Indus Basin Formations of Pakistan
Experimental study and modeling of water-based fluid imbibition process in Middle and Lower Indus Basin Formations of Pakistan
复制标题
巴基斯坦中下印度河盆地地层水基流体渗吸过程实验研究与模拟
DOI：
10.1007/s13202-020-01022-z
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
S. Ali
中科院分区：
文献类型：
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作者：
Muhammad Arqam Khan;J. Haneef;S. M. Lalji;S. Ali
井壁失稳是页岩地层钻井过程中出现的主要问题之一。在这些地层中钻探可能会导致井漏并导致裂缝。在巴基斯坦，钻井公司面临着大量泥页岩地层，这些地层是井壁不稳定问题的候选对象。为了解决这些问题，需要对页岩的组成及其与钻井液的化学反应有很好的了解。获得了三个不同地层的页岩样品。这些样品分属巴基斯坦印度河盆地的两个不同地区，分别进行了阳离子交换容量测试和X射线衍射分析，以确定其反应性和矿物学。然后使用线性动态膨胀仪测试样品的膨胀特性。测试是在两种不同的水基钻井液中进行的。然后根据每种类型的钻井液记录每个样品的高度和膨胀率的增加。在膨胀测试中使用的两种钻井液体系中，哪种类型的钻井液体系最能抑制巴基斯坦这些地区每个地层的页岩膨胀性质，进行了比较分析。最后，对每个页岩样品进行了分析和数值模拟。结果表明，对于中印度河盆地页岩地层，膨胀参数A(总膨胀率)显著增大，而滤失项(C)在一定时间后变得不再随时间变化。
Wellbore instability is one of the major problems that arise in drilling shale formations. Drilling in these formations may lead to breakouts and induce fractures. In Pakistan, drilling companies face quiet a number of formations that are shaly in nature and are candidates for wellbore instability issues. To counter these issues, it is required to have good understanding about the composition of the shale and its chemical reactivity with drilling fluids. Shale samples of three different formations have been obtained. These samples belong to two different regions of Indus Basin of Pakistan and were subjected to cation exchange capacity test and X-rays diffraction analysis to determine the reactivity and mineralogy, respectively. The samples were then tested for swelling properties using linear dynamic swell meter. The testing was done in two different water-based drilling fluids. The increase in height and swelling percentage for each sample was then recorded against each type of drilling fluid. A comparative analysis was done as to what type of drilling fluid systems out of the two used in the swelling test would best inhibit the swelling nature of shale for each formation in these regions of Pakistan. Finally, analytical and numerical modeling was performed on each shale sample. It was observed that the swelling parameter A (total swelling) increases significantly for Middle Indus Basin Shale Formation, and on the contrary, the filtration term (C) becomes independent of time after certain period of testing.