摘要
克深地区裂缝性气藏具有高压低孔低渗的特征。天然裂缝十分发育,在钻井过程中储层受泥浆伤害比较严重,多数井需通过储层改造才能达到经济开发的要求。通过施工曲线拟合、储层特征对比和改造前后产能对比等多重手段对储层改造效果进行了综合分析,研究认为天然裂缝是影响酸化解堵效果的最主要因素,裂缝密度和面缝率越大,酸化解堵效果越好,对天然裂缝不发育的气藏需进行加砂压裂改造,对天然裂缝较发育的气藏加砂压裂改造易出现脱砂甚至砂堵,从而造成改造后产能下降。
Keshen fractured gas reservoir has the characteristics of high pressure, low porosity and low permeability. Mud damage is very serious in the drilling process because of well developed natural fractures. Reservoirs of most wells need to be modified in order to meet the requirements of economic development. This paper comprehensively analyzed the effect of reservoir reconstruction through the construction curve fitting, the contrast of the reservoir characteristics and the comparison of production before and after the reconstruction. Studies suggested that natural fracture is the main factor that affect acidizing effects. The higher the fracture density and surface crack rate is, the better the effects of acidizing are. Sandfrac reconstruction is needed for the gas reservoir of less developed natural fracture but not for the gas reservoir of developed natural fracture because in this situation sand screening and even sand plug is easy to appear so as to drop the productivity.
出处
《油气藏评价与开发》
2013年第2期57-61,共5页
Petroleum Reservoir Evaluation and Development
关键词
裂缝性气藏
高压低渗
加砂压裂
酸化改造
产能评价
fractured gas reservoirs, high pressure and low permeability, sandfrac, acidification reconstruction, productivity evaluation
