METHOD FOR PREDICTION OF INHIBITION DURABILITY INDEX OF SHALE INHIBITORS AND INHIBITIVE DRILLING MUD SYSTEMS

摘要

Embodiments of a method used for determination of inhibition durability index (IDI) of an inhibitive mud system can include multiple stages, with each stage including specific steps. The first stage can include a dispersion test that evaluates the inhibition effects of a stability inhibitor after exposing the test material to the inhibitor. The second stage can include a durability inhibition assessment, which includes assessing the longevity of the effect of the inhibitor. A third stage can be used to graph or otherwise evaluate the results of the second stage or the first and second stages.

主权项

1. A method of evaluating a shale inhibitor, the method comprising the steps of:
(a) combining a predetermined quantity of drilling fluid and a predetermined quantity of earth material to define a first test mixture; (b) placing the first test mixture in a first hot roll cell; (c) rolling the first hot roll cell having the first test mixture in a hot roll oven at a first preselected temperature for a first predetermined amount of time; (d) removing from the first test mixture material smaller than a preselected size, the remaining material defining a first remaining material; (e) drying the first remaining material; (f) weighing the dried first remaining material; (g) combining at least a portion of the dried first remaining material with a non-inhibitive fluid to define a second test mixture; (h) placing the second test mixture in a second hot roll cell; (i) rolling the second hot roll cell having the second test mixture in the hot roll oven at a second preselected temperature for a duration time (t); (j) removing from the second test mixture material smaller than a second preselected size, the remaining material defining a second remaining material; (k) drying the second remaining material; (l) weighing the dried second remaining material; and (m) recording the weight of the dried second remaining material.