Reservoir and completion quality assessment in unconventional (shale gas) wells without logs or core

摘要

Embodiments herein relate to a method for recovering hydrocarbons from a formation including collecting and analyzing a formation sample, drilling operation data, and wellbore pressure measurement, estimating a reservoir and completion quality, and performing an oil field service in a region of the formation comprising the quality. In some embodiments, the formation sample is a solid collected from the drilling operation or includes cuttings or a core sample.

主权项

1. A method for drilling a subterranean wellbore, the method comprising:
(a) drilling the subterranean wellbore; (b) analyzing hydrocarbon gases acquired while drilling in (a) to obtain a log of hydrocarbon gas content and composition; (c) analyzing formation cuttings acquired while drilling in (a) to obtain a chemical composition of the cuttings, the chemical composition including at least one of a mineralogy of the cuttings, a kerogen content, and a kerogen maturity; (d) analyzing the formation cuttings acquired while drilling in (a) to obtain an estimate of surface area and pore volume of the formation cuttings; (e) analyzing the formation cuttings acquired while drilling in (a) to obtain elastic properties of the formation cuttings; (f) processing the log obtained in (b), the chemical composition of the cuttings obtained in (c), and the estimate of surface area and pore volume of the formation cuttings obtained in (d) to compute a reservoir quality index; (g) processing the elastic properties of the formation cuttings obtained in (e) to compute a completion quality index; (h) processing the reservoir quality index computed in (f) and the completion quality index computed in (g) to compute a number and position of fracturing stages for the subterranean wellbore.