Patent ID: 8739898
Filing Date: 2014-06-03
Classification: E21B

Abstract:
1. A method for detecting the presence of an acid gas in a formation fluid from a subterranean formation, the method comprising: (a) lowering a coring assembly into a wellbore, the coring assembly including an outer core barrel and an inner core barrel disposed within the outer core barrel, wherein the outer core barrel has a lower end comprising an annular coring bit, and wherein the inner core barrel has a central axis, an upper end, a lower end opposite the upper end, and a core sample chamber extending axially from the lower end; (b) flowing drilling fluid through the sample chamber and out the lower end of the inner core barrel; (c) restricting the flow of drilling fluid through the sample chamber and the lower end of the inner core barrel after step (b); (d) capturing a core sample from the subterranean formation within the sample chamber of the inner core barrel during step (c); (e) raising the coring assembly to the surface after step (d); (f) contacting a formation fluid in the sample chamber with at least one detector during step (e); and (g) detecting the presence of a formation acid gas in the formation fluid with the at least one detector during step (e).