Study on sweet spot identification and parameter optimization for the Wubaochang block transformation in eastern Sichuan
In the Wubao Field,the gas production rate is relatively low after production,and the main controlling factors for the development of sweet spots in the reservoir are unclear.The appropriate reservoir transformation techniques for different types of reservoirs in the field are also uncertain,and during the production process,both the production rate and pressure decline rapidly without a stable production period.By constructing G-function characteristic curves based on shut-in period data obtained during fracturing operations,the complexity of post-fracturing fractures can be quickly identified.Through studying the correlation between the G-function characteristic values,reservoir thickness,and productivity,the main controlling factors for post-fracturing production are preliminarily determined.The geological sweet spots in the Wubao area are identified by integrating well seismic data,which improve the accuracy of identifying and predicting high-quality reservoirs.A three-dimensional fracturing model is established based on geological and geomechanical models.The reservoir's vertical stimulation capability is demonstrated by analyzing the stress difference and interlayer thickness of the barrier layer.The reservoir's planar fracturing capability is evaluated by considering the difference in the coefficient of horizontal stress and the angle of approach.The research results show that there are multiple thin interlayers in the block,requiring the use of controlled interlayer fracturing techniques in horizontal wells.It is recommended to optimize the targeted reservoir intervals and adopt a multistage fracturing approach to improve the vertical transformation extent and effective reservoir utilization.Moreover,the block exhibits feasibility for creating multistage fractures and a complex artificial fracture network,suggesting the need for multistage temporary isolation and turning point fracturing,as well as horizontal well volume transformation techniques.
G-functionsweet spot identificationfracturing through layersfeasibility of slit-net fracturing
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