Summary: A non-destructive method for mapping formation damage
M.A. Khan a,*, S.Z. Jilani b,c
, H. Menouar c
, A.A. Al-Majed b,c
Center for Applied Physical Sciences, The Research Institute, King Fahd University of Petroleum and Minerals, KFUPM Box 1947, Dhahran 31261,
Department of Petroleum Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
Center for Petroleum and Minerals, The Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
Received 19 February 2001; accepted 28 March 2001
Applicability of an ultrasonic method for non-destructive mapping of formation damage is reported for the ®rst time. Oil-satu-
rated and `mud'-damaged Berea rock samples were prepared in the laboratory using a leak-o apparatus and machined dry rocks.
The depth of `mud invasion' was monitored under varying conditions of overbalanced pressure DP and contamination time DT. An
interesting observation is that a region of DP $ 2:07 Â 103
kPa produces minimum invasion depth under the conditions investigated.
The results are discussed in the context of horizontal wells. Ó 2001 Elsevier Science B.V. All rights reserved.
PACS: 81.70 Dw; 43.35+d; 91.60 Lj; 62.65+k