This paper describes the testing of a novel concept based on resistivity measurements to monitor acid-stimulation operations. It is believed that the proposed concept for monitoring the wormholing process can be adopted in the field with the deployment of induction tools. The outcome of this novel monitoring concept is expected to provide an unprecedented level of understanding of the depth, number, and type of wormholes being created downhole.
Induction-logging tools can be viewed as an attractive option for characterizing wormhole morphology resulting from the acidizing process and can be used to assess acid-stimulation operations. The authors propose to extend the use of resistivity-logging tools for evaluating acid-stimulation jobs after well cleanup. This concept relies on the significant variations in the electrical resistivity of the different fluids and chemicals involved in the acidizing process and the increase in the effective porosity in the near-wellbore region resulting from the acid reactive dissolution. In this work, the authors conducted resistivity measurements while acidizing carbonate core samples. To do so, an electrically sensitive coreflooding setup was designed to conduct acidizing tests of carbonate core samples while measuring the change in the electrical resistivity at multiple points along the core and in real time. The paper shows the potential use of such measurements to monitor wormhole penetration and branching in real time. A yard test was conducted to verify the response of a real induction tool to simulated wormholing features....
Monitoring of Matrix Acidizing by Use of Resistivity Measurements
01 June 2017