Apparatus and methods for detecting gases during coring operations

摘要

A method for detecting the presence of an acid gas in a formation fluid from a subterranean formation comprises (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. The inner core barrel has an upper end, a lower end opposite the upper end, and a core sample chamber extending axially from the lower end. In addition, the method comprises (b) capturing a core sample from the subterranean formation within the sample chamber. Further, the method comprises (c) raising the coring assembly to the surface after (b). Still further the method comprises (d) contacting a formation fluid in the sample chamber with at least one detector during (c). Moreover, the method comprises (e) detecting the presence of a formation acid gas in the formation fluid with the at least one detector during (c).

主权项

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).