| 摘要 |
A method is provided for evaluating the quality of a hydraulic fracture treatment performed in a completed wellbore penetrating a subterranean hydrocarbon-bearing formation. The method is initiated by creating a pressure differential or utilizing an existing pressure differential between the wellbore and the formation and placing a lower packer and an upper packer in the wellbore. The lower and upper packers are positioned in the wellbore at or near the bottom of the producing interval to enclose one or more lower perforations within a wellbore chamber sealed to the remainder of the wellbore. Pressure values of the wellbore chamber are measured for a predetermined time period and then the lower and upper packers are repositioned to enclose the next one or more perforations in sequence within a new wellbore chamber. This procedure is repeated until pressure values have been measured in all wellbore chambers enclosing perforations of interest. The pressure values are used to the determine rate of pressure change in each wellbore chamber. By comparing the rates of pressure change of the wellbore chambers, the character and quality of a fracture and/or fracture network at the casing perforations can be evaluated. A relatively high rate of pressure change in a given wellbore chamber is indicative that the one or more casing perforations of the wellbore chamber are in fluid communication with one or more high quality fractures having a high degree of networking and/or vertical connectivity with other casing perforations. A relatively low rate of pressure change in a given wellbore chamber is indicative that the one or more casing perforations of the wellbore chamber are in fluid communication with one or more low quality fractures having little or no networking and/or vertical connectivity. |
