压前评估在H136井第三次压裂施工中的应用

Pre-assessment for the third time fracturing in Well H136

张军 孙虎 陆红军 段凯 纪冬冬 陈其松

ZHANG Jun SUN Hu LU Hongjun DUAN Kai JI Dongdong CHEN Qisong

川庆钻探公司长庆井下技术作业公司， 陕西西安　710021 长庆油田公司超低渗透油藏研究中心，陕西西安　710021

Changqing Downhole Operation Company, Chuanqing Drilling Company, Xi’an 710021, China Super-low Permeability Research Center, Changqing Oilfield Company, Xi’an 710021, China

压前评估技术能够定量评价压裂效果影响因素及其联系，使压裂措施决策方法更加科学化和量化，提高压裂有效率。但压前评估技术主要针对压前的选井选层工作是否合理，而对重新施工井或施工失败的井的分析应用很少。在长庆区域通过对勘探评价井H136井长8油层两次压裂施工失败的原因分析和对储层生产能力评估、压裂失效评估、压裂液伤害评估、泥质含量的再评价等内容的压前评估，得出了该井第3次压裂的有利和不利条件，采用优化的前置酸变排量压裂改造方案施工，压后效果较好。该井的第3次压裂成功为后期鄂尔多斯盆地深层评价井和重点勘探井的有效开发提供了借鉴。

Pre-assessment can conduct the quantitative evaluation for influencing factors of fracturing effect and their relations, which could make the fracturing operation more scientific and quantification, and improve the operation efficiency for the target layer. At present, the pre-evaluation technique is aimed at whether the target wells or target layers are reasonable; for those re-operation wells or failed-treated wells, few or no analysis is engaged by such technology. The failure reasons of two fracturing operations for Layer Chang8 in exploration Well H136 in Changqing Area were analyzed, and some pre-evaluations including reservoir production capability, fracturing failure, fracturing liquids damage and re-evaluation of the shale content were performed, from which advantages and disadvantages for the third operation were obtained. Based on those a pad-acid variable rate stimulation method was carried out which have achieved the expected result. The successful practice of the third fracturing will provide technical references of effective development for further evaluated wells and key exploration wells in Ordos basin.