镇原油田长81油藏储层特征与工艺改造

摘要

With the scale development and westward blocks of the Chang 81 reservoirs,the poor properties,and the significant reduction of single well producing test,the reservoir reconstruction is needed to improve the volume and fracture conductivity and then improve the production of single well.According to Chang 81 reservoir characteristics and with reference to the reconstruction outcomes and experiences of the Chang 6 reservoir reconstruction technology in the Huaqing oilfield,Ordos Basin,the new technologies,such as multiple-stage fracturing technique in deviated wells,oriented perforating,mixed water volume fracturing,are used to transform and adapt the reservoir,and good results have been achieved.The multiple-stage fracturing technique in deviated wells increases 13.69 ％ production for a single well.The oriented perforating increases 19.09 ％ production for a single well.The mixed water volume fracturing has the most significant production for a single well,up to 242％.The field test proves that the technology is of great significance in improving the development effects of super-low permeability reservoirs.%随着鄂尔多斯盆地镇原油田81油藏规模开发和产建区块西进,储层物性变差,单井试排、试采产量下降明显,为提高单井产量,以提高储层改造体积及改善裂缝导流能力为目标的储层改造势在必行.针对长81油藏储层发育特征,参照华庆油田长6油藏储层工艺改造成果和经验,采用斜井多段压裂、定向射孔和混合水体积压裂等新工艺对储层进行改造和适应性分析,结果表明:实施斜井多段压裂技术单井增产13.69％；实施定向射孔技术单井增产19.09％；实施混合水体积压裂技术单井增产效果最显著,可达242％.巳开展的现场试验结果,证明针对储层发育特征实施的储层新工艺改造技术,对提高超低渗透油藏开发效果具有重要意义.