Research And Application On Earth Stress Field For ShiNan Oilfield Refracturing Well

After a period of production time, fracture flow capacity gradually decreases and stimulation effect is inferior to fractureing initial stage, even some completely vanishes because of many kinds of factors. All of the crude oil of old fracture controlling region is nearly cutting out, at the same time, there is a great quantity of crude oil at the region of out of the old fracture. Hence, refracture technology of making new fracture is a important mean of controlling water cut and stabilizing oil during development life. So this text mainly research refracture technology of making new fracture associating geologic characteristic and development status of ShiNan Oilfield. Making calculation model using of well log information, factorization and confirm reservoir rock mechanics parameters and ground stress field distribution.Through solving primary artificial fracture induced stress model and induced stress because of oil well production and so on, get the distribution of in-situ-stress field of reservoir. Based on the above researches of ground stress field distribution, make and solve trace model of refracture with the theory of rock mechanics, fracturing mechanics and hydraulic fracturing mechanics. Associating fracture turning model with hydraulic fracturing three-dimension extending model, formulate software and simulate fracture geometry and mutually related fracturing treatment parameter.