神木区块致密砂岩气藏储层保护钻井液优选

发布时间：2018-02-22 22:53

本文关键词： 致密砂岩气藏储层特征储层保护数值模拟渗透率恢复值相对渗透率曲线钻井液优化　出处：《油气地质与采收率》2017年02期 　论文类型：期刊论文

【摘要】：储层保护是致密砂岩气藏能否经济高效开发的重要条件之一。目前,渗透率恢复值实验是评价钻井液储层保护效果的主要方法,但其技术手段较单一,并且钻井液对致密砂岩气藏储层伤害是一个长期的、涉及到气、液两相流相互干扰的过程。现用的渗透率恢复值实验无法评价气藏产能受钻井液伤害的长期性影响,而岩心受到钻井液污染前、后的相对渗透率实验可以较好地弥补这一缺陷。结合塔里木油田神木区块储层特征,利用综合分析法,通过对比分析被钾聚磺钻井液和油基钻井液污染前、后岩心的渗透率恢复值、相对渗透率曲线线型的变化及CMG数值模拟软件砂岩模块的含水饱和度、含气饱和度等变化,对现场使用的钾聚磺钻井液、油基钻井液的储层保护效果进行模拟研究,并拟合出不同钻井液对气藏井产能的影响,以产能作为储层伤害程度的评价指标。综合评价结果表明,油基钻井液的储层保护效果优于钾聚磺钻井液,累积产气量提高约为15%。
[Abstract]:Reservoir protection is one of the important conditions for economic and efficient development of tight sandstone gas reservoir. At present, permeability recovery test is the main method to evaluate the reservoir protection effect of drilling fluid, but its technical means are relatively simple. Moreover, drilling fluid is a long-term damage to tight sandstone gas reservoir, which involves the process of mutual interference between gas and liquid two-phase flow. The current permeability recovery experiment can not evaluate the long-term effect of drilling fluid damage on gas reservoir productivity. Before the core is polluted by drilling fluid, the relative permeability experiment after drilling fluid can make up this defect well. Combined with the reservoir characteristics of Shenmu block in Tarim Oilfield, the comprehensive analysis method is used. By comparing and analyzing the change of permeability recovery value, relative permeability curve line change, water saturation and gas saturation of sandstone module of CMG numerical simulation software before and after being polluted by potassium polysulfonate drilling fluid and oil base drilling fluid, etc. The reservoir protection effect of potassium polysulfonate drilling fluid and oil base drilling fluid used in the field is simulated and studied, and the effects of different drilling fluids on well productivity of gas reservoir are fitted out. The productivity is regarded as the evaluation index of reservoir damage degree. The comprehensive evaluation results show that, The reservoir protection effect of oil-base drilling fluid is better than that of potassium polysulfonate drilling fluid, and the cumulative gas production is increased to about 15%.
【作者单位】：中国石油钻井工程技术研究院;中石油北京天然气管道有限公司;中国石油塔里木油田分公司油气工程院;
【分类号】：TE258

【相似文献】