库车山前致密砂岩气藏储层伤害分析及控制对策研究

库车山前致密砂岩气藏目前有效解决顺利钻进问题;而钻完井过程中并未形成配套的储层保护技术。以大北区块为例,分析岩性物性、裂缝、温压等的储层特征,进行岩石敏感性、液相圈闭、钻井液动态损害评价等实验;并在对钻井液中固相颗粒、滤液、处理剂吸附原因分析的基础上,确定当前储层伤害的主要机理。依据储层损害机理,提出应对策略,主要包括:提高抑制能力和减少工作液侵入能够有效的减小岩石敏感性和液相圈闭损害;应用高效的暂堵和快速封堵技术可有效减少渗流通道堵塞损害;调整完井工艺措施是当前减小应力敏感性损害的主要方法。

Damage Analysis of Tight Sandstone Gas Reservoir And Control Measures of Kuqa Piedmont Structure

Drilling difficulties have been effectively solved in the tight sandstone gas reservoir of Kuqa piedmont structure, but formation protection technology has not been formed in the process of drilling and completion. This study chose Dabei Block as an example, analyzed reservoir characteristics about lithology, cracks, temperature, pressure and so on, carried out the experiments about rock sensitivity, trap of liquid phase and dynamic damage evaluation of drilling fluid, and analyzed the damage reasons of solid phase particles, filtrate and treating agent adsorption, all of these get main damage mechanisms of reservoir. On the basis of reservoir damage mechanisms, the study put forward the coping strategies, mainly includes: improving the inhibition ability and reducing working liquid invasion can effectively reduce the rock sensitivity and liquid trap; application of efficient temporary plugging and raid plugging technology can effectively reduce the damage of seepage channel blockage; adjusting the measures of completion technology is the current main methods to minimize stress sensitivity damage.