RESEARCH AND APPLICATION ON SECOND SAND FILLING FRACTURING

The formation of Huabei Oilfield has the character of low Yang’s Modulus and soft rock. The formation doesn’t possess the ideal barrier bed, which forms the fractures extend over the height of formation, so most parts of the proppants are filled in non-production formation, as well as serious proppant embedment. All of these decline the flow conductivity and come into many ineffective wells and low-effective wells. The article based on the research and analysis causing ineffective and low-effective, and conducted the process of second sand filling fracturing. This technology develops the normal fracture height controlling technology. Through changing the rock mechanics and the flow routine of fracturing fluids, it reached the purpose of controlling fracture height. Also through increasing the layer numbers of proppant filling, it extended the width of fractures and increased fracture flow conductivity. This technology has applied more than 40 wells onsite, it surely increased efficiency and production period after fracturing, and got valuable economic and social benefits.