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- W2013181831 abstract "Abstract Return permeability (core flooding) laboratory tests are routinely performed in conjunction with the drilling fluid selection process in order to assess the potential damage a fluid can cause to a formation. A typical return permeability test is conducted at high-temperature, high-pressure (HTHP) conditions on either an actual formation or on replacement cores. A quantitative value of the percentage of return permeability is often used to provide insight on potential formation damage. While there have been various published articles focused on the value of the return permeability and associated damage mechanisms, there is an apparent lack of subsidiary data itself. Such subsidiary data include filtrate losses and flow initiation pressures. What do these values indicate and is there a correlation between these values with respect to return permeability? This paper will answer these questions by examining the data from 325 return permeability tests. These return permeability tests were conducted over a wide array of permeabilities with cores ranging from less than 0.5 mD to more than 2 D, different pore structures and varying clay content. The temperature conditions ranged between 80 to 350°F and differential pressures between the wellbore and reservoir ranged from 150 to 1500 psi, which simulated a variety of wellbore conditions – including depleted wells. The objective of this study was to obtain the correlations between the rock permeabilities, fluid loss, flow initiation pressure, return permeability figures and the length of time for the return permeability to reach steady state. Our study indicates that correlations between fluid loss filtration and return permeability are more evident in high-permeability core plugs using oil as the production fluid while correlations between flow initiation pressure and return permeability are more apparent in low-permeability core plugs using gas as the production fluid. The increase in filtration may imply that a longer length of time is required to achieve return permeability steady state. Overbalance pressures of less than or equal to 500 psi may be less damaging in comparison to overbalance pressures of more than 500 psi." @default.
- W2013181831 created "2016-06-24" @default.
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- W2013181831 date "2014-02-26" @default.
- W2013181831 modified "2023-09-27" @default.
- W2013181831 title "Deciphering Return Permeabilities" @default.
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- W2013181831 doi "https://doi.org/10.2118/168119-ms" @default.
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