Effect of Drawdown Evolution on the Hydraulic Fractured Well Performance. Can We Minimize It and Optimize Well Economy?

In order to economically produce unconventional reservoirs, it is necessary to fracture hydraulically to increase the exposed surface of the formation and generate channels of high conductivity. The non-degradation of conductivity during the productive life of the well is crucial for a good production performance. During the well production, the bottom hole flowing pressure reduces for a fixed choke diameter. Additionally, at each choke change, there is an increase in the rate of pressure falling. During the linear flow, the degree of fracture degradation can be analyzed using a plot of the inverse of productivity index against the square root of time. The slope is related to the exposed surface of the hydraulic fracture and its permeability. The higher the slope, the smaller the area and / or the permeability. Based on that it is concluded that the hydraulic fracture has been damaged or disconnected at each choke change. In addition, such loss would appear to be abrupt and not gradual and occurs at different absolute values of bottom hole flowing pressure.