Volume 37 Issue 5
Oct.  2020
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YOU Lijun, CHEN Yang, KANG Yili, YAN Xiaopeng, WANG Yijun. Productivity Index Method for Experimental Evaluation of Working Fluid Damage in Low Permeability Gas Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 620-625. doi: 10.3969/j.issn.1001-5620.2020.05.014
Citation: YOU Lijun, CHEN Yang, KANG Yili, YAN Xiaopeng, WANG Yijun. Productivity Index Method for Experimental Evaluation of Working Fluid Damage in Low Permeability Gas Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 620-625. doi: 10.3969/j.issn.1001-5620.2020.05.014

Productivity Index Method for Experimental Evaluation of Working Fluid Damage in Low Permeability Gas Reservoir

doi: 10.3969/j.issn.1001-5620.2020.05.014
  • Received Date: 2020-07-25
  • Publish Date: 2020-10-28
  • Working fluids pumped into a low permeability gas reservoir cause damage to the production capacity of the gas well, and permeability recovery is generally used to evaluate the degree of reservoir damage. Based on field practice, a percent retention of productivity index is presented as an index for evaluating the gas reservoir damage by fluids injected into gas wells. An evaluation method, which is called productivity index method, was established for evaluating the damage caused by fluids injected into low permeability gas reservoirs. It was found that the productivity index method can determine the effects of differential pressure and time on the degree of reservoir damage by acquiring dynamic experimental data using pressure depletion displacement. The productivity index method can simulate the reservoir condition and tell the change of filtration capacity of rock specimen before and after being damaged by the working fluids. This method, in connection with pressure depletion method and industrial standard methods, provides a new clue for improving the evaluation of reservoir damage by working fluids and is helpful in optimizing working fluids for reservoir protection.

     

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