Changes in Perforation-Induced Formation Damage with Degree of Underbalance: Comparison of Sandstone and Limestone Formations.

Halleck, P. M. ; Karacan, C. O. ; Hardesty, J. ; Detwiler, R.

Technical Information Center Oak Ridge Tennessee

关键词: Sandstone;    Limestone;    Perforation;    Dimensions;    Damage;   

RP-ID  :  DE200415009739

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Field data and recently developed models provide some guidance for estimating the underbalance needed to obtain fully functional perforations, but there are little data available that relate flow efficiency to lower underbalances in different rock types. To improve understanding of the surge cleanup process, we have performed two series of perforation flow tests in Berea Sandstone and in Bedford Limestone cores at increasing levels of underbalance. Flow tests were performed according to modified API RP43, section 4 test procedures. At the conclusion of the tests, the cores were analyzed using high-resolution X-ray CT techniques. The shape, dimensions and total volumes of both the open tunnel and the remaining embedded liner metal were extracted from the CT data and correlated with the underbalance and with the flow test results.