低渗透油藏酸化压裂解堵技术研究

Research on Acidizing Fracturing and Plug Removal Technology in Low Permeability Reservoirs

为提高低渗透储层水平井分多段压裂工艺技术效果,分析了研究区主力层位山西组和石盒子组储层地质特征,明确了地层天然气、地层水、地层温度和压力特征,利用测井资料计算动态岩石力学参数,然后寻找动态岩石力学参数和静态岩石力学参数以及压裂施工压力之间的关系,评价地层可压性,通过综合考虑含油气性建立地层分段分簇模型,并利用该模型为研究区水平井分段定簇。微地震地面监测表明,裂缝长度在271~683 m范围,人工缝网的几何尺寸复杂,压裂效果明显。

In order to improve the effect of multi-stage fracturing technology for horizontal wells in low-permeability reservoirs,the geological characteristics of Shanxi formation and Shihezi formation were analyzed,the characteristics of natural gas,formation water,formation temperature and pressure were defined.The dynamic rock mechanics parameters were calculated by using logging data,and then the relationship between the dynamic rock mechanics parameters with static rock mechanics parameters and fracturing construction pressure was investigated,and the formation compressibility was evaluated.Through comprehensive consideration of oil-gas bearing property,the formation segmentation clustering model was established,and the model was used tocarry out the segmentation and clusteringfor horizontal wells in the study area.The microseismic surface monitoring showed that the fracture length was in the range of 271~683 m,the geometry size of artificial fracture network was complex,and the fracturing effect was obvious.