APPLICATION OF OIL BASED FRACTURING TECHNOLOGY TO RESERVOIR STIMULATION AT QIGEQUAN OIL FIELD OF QINGHAI

By analysis of characteristics of sand bodies and hard-exploited reservoir of Qigequan Oil field which have low pressure,low permeability and water sensitivity,and by research of fracturing technology,we put forward the principle for well selection,developed the formula and its oper procedure for oil-based fracturing fluid which fit in with the properties of the reservoirs,optimized the fracture parameters for reservoir and treatment parameters,acquired a suite of oil-based fracturing technology form selection to result evaluation.By means of 3 years research and application,39 treatments have been performed,successful treatments account 93% and the effectiveness of successful treatments was 89.7%,the average effectiveness period have been over 600 days and a total of 49854 tons of oil has been stimulated.The above mentioned technology has resulted in better incremental result and higher economic benefits,and will help in great deal for the exploitation of similar reservoirs.