Modified method for fracability evaluation of tight sandstones based on interval transit time

作     者：Jing Li Xiao-Rong Li Hong-Bin Zhan Ming-Shui Song Chen Liu Xiang-Chao Kong Lu-Ning Sun Jing Li;Xiao-Rong Li;Hong-Bin Zhan;Ming-Shui Song;Chen Liu;Xiang-Chao Kong;Lu-Ning Sun

作者机构：College of Pipeline and Civil EngineeringChina University of Petroleum(East China)Qingdao 266580ShandongChina College of Safety and Ocean EngineeringChina University of Petroleum(Beijing)Beijing 102249China Department of Geology and GeophysicsTexas A&M UniversityCollege StationTX 77843USA Sinopec Shengli Oilfield CompanyDongying 257001ShandongChina 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2020年第17卷第2期

页      面：477-486页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China(2016ZX05002-002) the National Natural Science Foundation of China(41972138) 

主　　题：Tight sandstone Brittleness index Fracture toughness Fracability index 

摘      要：Fracability is a property that indicates how easy reservoir rocks can be fractured in hydraulic fracturing *** is a key parameter for fracturing design and *** order to utilize continuous logging data to predict fracability,synchronous tests of dynamic and static mechanical parameters of rocks under different confining pressures were conducted on13 tight sandstone samples derived from the central Junggar Basin,China.A modified formula between dynamic and static mechanical parameters was *** of the tight reservoir in the Junggar Basin was then evaluated based on brittleness index,fracture toughness,and fracability *** effectiveness of fracturing was analyzed combined with the oil testing curve after hydraulic *** results show that:(1)The distribution of oil-bearing formations in the studied area coincides well with stratum of higher fracability index.(2)The critical fracability index is determined to be 0.3,three formations are selected as fracturing candidates,and a thin mudstone interbed is identified in the oil-bearing formation.(3)Well testing curve verifies the reliability of the fracability evaluation method and the accuracy of the modified formula between dynamic and static mechanical *** study provides useful information for improving fracturing operations of tight oil and gas reservoirs.