RESEARCH AND APPLICATION OF FRACTURING FLUID SYSTEM OF TUFF RESERVOIR

For the bad reservoir properties in Xinganling group of Hailaer basin,it is can’t be produced before stimulation.Xinganling group reservoir has the character of complex lithology,developed sand tuff,expended and disintegrated as soon as encountering water,and sand plug happened at low sand rate usually caused the failure of fracturing operation,It also affecting the further exploration of sand tuff reservoir.Through analysis,and consider that Fracturing Fluid is the key element to decide the result of fracture.The mineral character,rock mechanics property,and hydrolization character of sand tuff were studied in laboratory,a new type of Fracturing Fluid system of cross-linking and emulsify was developed.The result showed that this Fracturing Fluid system has characters of compatible with sand tuff and low loss.Its overall performance was well.The fracturing fluid system has been successfully used in 66 wells and 163 layers,The success ratio was 97 and meets the need for fracture stimulation to sand tuff.