Application of Rock Strength in Drilling Evalution


Different sources can be used to develop rock strength information along the wellbore. Such strength information is important when assessing the stability of the wellbore, selecting mud weights and designing casing programs. However, there are other areas, especially in drilling, where rock strength information is applicable, but still underutilized. A methodology is developed to estimate drilling time and bit wear before drilling if rock strength is known. To estimate drilling time and bit wear, effects of other parameters like drilling parameters, well bore size and drilling bit design has to be normalized. This methodology has been used to estimate drilling time and estimate bit wear and further evaluate drilling performance while drilling. After drilling the additional information has been used to conduct a post analysis and transfer knowledge from well to well. The advantage of this methodology is it eliminates the effect of geological variability when comparing performance between wells and fields.

Meeting Name

SPE 10th Latin American and Caribbean Petroleum Engineering Conference (2007: Apr. 15-18, Buenos Aires, Argentina)


Geosciences and Geological and Petroleum Engineering

Keywords and Phrases

Drilling evalution; Mud weights; Rock strength; Wellbore; Oil fields; Petroleum reservoir evaluation; Rocks; Strength of materials; Wear of materials; Oil well drilling

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


File Type





© 2007 Society of Petroleum Engineers (SPE), All rights reserved.

Publication Date

01 Apr 2007