钻井压力对煤层的伤害  

DRILLING PRESSURE ON COALBED FORMATION AND ITS DAMAGE

作　　者：黄磊[1] 汪伟英[2] 

机构地区：[1]长江大学工程技术学院,湖北荆州434023 [2]长江大学石油工程学院,湖北荆州434023

出　　处：《新疆石油天然气》2012年第1期28-32,4,共5页Xinjiang Oil & Gas

摘　　要：钻井施工是造成煤层气储层损害的一个重要环节,钻井压力必然导致煤岩周围应力的改变,由于煤岩易脆易压缩的物理性质和复杂有机沉积物的化学性质以及特殊的基质孔隙和割理组成的孔隙结构,使得煤层气储层更易随外部应力变化使其渗透性遭到损害。本论文首先分析了钻井压力对地层损害的机理;然后通过应力敏感性实验以及渗流规律实验,研究了在钻井过程中压力改变对煤岩渗透率的影响;最后通过固相颗粒侵入实验研究了钻井压力对固相颗粒侵入深度的影响。Drilling operation in coalbed gas reservoir can also easily cause formation damage.Drilling pressure will inevitably lead to stress changes in the surrounding,Because of special physical property、special chemistry property and special pore structure,so the permeability of the coalbed seam is easier reduced than oi1 field when stress is changed or outer liquid flowed in.The article first analyzes the mechanism of drilling pressure on formation damage;then studies the effect of pressure changes in the drilling process on coal rock permeability through stress sensitivity and permeability laws experiment;at last studies the effect of drilling pressure changes on the invasion depth of solid particles through solid particles invasion experiment.

关 键 词：煤层气 储层 钻井压力 应力敏感 渗透率 伤害 

分 类 号：TE242[石油与天然气工程—油气井工程]