isochronal test

isochronal test

[ī′sä·krən·əl ′test]
(petroleum engineering)
Short-time back-pressure test for low-permeability reservoirs that otherwise require excessively long times for pressure stabilization when wells are shut in.
References in periodicals archive ?
9 MMcf/d and 296 bbl/d 54AAPI condensate through a 16/64 choke in a three-stage isochronal test, and an average rate of 2.
9 MMcf/d and 296 bbl/d 54[degrees]API condensate through a 16/64" choke in a three-stage isochronal test, and an average rate of 2.
A 4-Point Isochronal test achieved stabilized flow rates of approximately 14 million cubic feet per day (~2,333 BOE per day) on a 48/64” choke, with associated condensate production increasing during testing.
The well was tested on a four point isochronal test with a final test rate of 11.
1 well (Stampede Bearcat et al Hartell 4-13-19-2 W5M), are very positive and the four-point isochronal test is currently in the final shut-in, build up phase of the operation.
A 4-Point Isochronal test on the Sidewinder-3 discovery well achieved a stabilized flow rate of 7.
As of today's date this test operation is now in an extended flow stage until June 26, after an initial clean-up flow period and four-point Isochronal test.
The 4- Point Isochronal test indicated a tubing restricted maximum gas flow rate of 13 million cubic feet per day (2167 BOE's/day).