致密砂岩气藏钻井损害对产能的影响研究

发布时间：2018-06-01 01:05

本文选题：致密砂岩 + 气藏　；参考：《西南石油大学》2015年硕士论文

【摘要】：致密砂岩气藏资源丰富,是未来天然气储量增长上产的重要领域之一。由于致密砂岩储层具有特殊的地质特征,在钻井过程中极易受到损害。分析不同钻井方式下的储层损害程度,研究钻井储层损害对气井产能的影响,对于致密砂岩气藏钻井过程中的储层保护及产能预测研究具有重要意义。本文以致密砂岩气藏钻井储层损害的地质特征分析为基础,通过对钻井储层损害室内实验评价和钻井储层损害下的产能预测模型的研究,取得了以下主要研究成果： (1)通过对我国部分致密气藏损害储层的地质特征进行统计及电镜扫描等实验评价,分析了钻井过程中致密砂岩储层潜在的损害类型； (2)通过相应的评价方法开展了不同钻井方式下的储层损害实验评价,分析了不同钻井方式下的渗透率损害程度； (3)基于钻井液在不同钻井方式下的侵入深度数学模型,推导了裸眼完井条件下考虑钻井储层损害的稳态产能预测模型；建立了基于Monte-Carlo的气井产能不确定性评价方法,编制了基于钻井储层损害的气井稳态产能概率模型计算程序,通过实例分析了钻井储层损害对稳态产能的影响； (4)建立了考虑气体渗流和岩石变形的致密砂岩气藏动态产能数学模型,同时建立了基于Weibull分布规律模拟真实储层的方法,以实际致密砂岩气井参数为例,通过COMSOL多物理场耦合模拟软件对模型进行数值求解,并分析了钻井储层损害对动态产能的影响。研究成果可以为不同钻井方式下的储层损害评价及产能预测提供科学方法,并为利用合理的钻井方式开发致密砂岩气藏提供决策方法。
[Abstract]:The tight sandstone gas reservoir is rich in resources and is one of the important fields in the future natural gas reserves growth. Because tight sandstone reservoir has special geological characteristics, it is easy to be damaged during drilling. It is of great significance for reservoir protection and productivity prediction in tight sandstone gas reservoirs to analyze the degree of reservoir damage under different drilling modes and to study the effect of drilling reservoir damage on gas well productivity. Based on the analysis of geological characteristics of drilling reservoir damage in tight sandstone gas reservoir, through the laboratory evaluation of drilling reservoir damage and the research of productivity prediction model under drilling reservoir damage, the main research results are obtained as follows: 1) the potential damage types of tight sandstone reservoirs during drilling are analyzed by statistical analysis and electron microscope scanning on the geological characteristics of some tight gas reservoirs in China. 2) through the corresponding evaluation methods, the experimental evaluation of reservoir damage under different drilling modes is carried out, and the degree of permeability damage under different drilling modes is analyzed. Based on the invasion depth mathematical model of drilling fluid under different drilling methods, the steady productivity prediction model considering drilling reservoir damage under open hole completion condition is derived, and the method of evaluating the uncertainty of gas well productivity based on Monte-Carlo is established. The calculation program of steady-state productivity probability model of gas well based on drilling reservoir damage is worked out, and the influence of drilling reservoir damage on steady productivity is analyzed by examples. The dynamic productivity mathematical model of tight sandstone gas reservoir considering gas percolation and rock deformation is established, and the method of simulating real reservoir based on Weibull distribution law is established. The actual tight sandstone gas well parameters are taken as an example. The model is solved numerically by COMSOL multi-physical field coupling simulation software, and the influence of drilling reservoir damage on dynamic productivity is analyzed. The research results can provide a scientific method for reservoir damage assessment and productivity prediction under different drilling modes and a decision method for developing tight sandstone gas reservoirs with reasonable drilling methods.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE258

【参考文献】