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SPE Annual Technical Conference and Exhibition - New Acid-Tunneling Insights from Full-Scale Water- and Acid-Jetting Tests by Livescu, S.; McDuff, D.; Comeaux, B.; Singh, A.; Lindsey, B. J. is a scholarly article available to read on EtoBox.

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## Abstract Acid-tunneling is an acid jetting method for stimulating carbonate reservoirs. Several case histories from around the world were presented in the past showing optimistic post-stimulation production increases in open-hole wells, comparing to conventional coiled tubing (CT) acid jetting, matrix acidizing, and acid fracturing. However, many questions about the actual tunnel creation and tunneling efficiency are still not answered. In this paper, the results of an innovative full-scale research program involving water and acid jetting are reported for the first time. The tunnels are constructed through chemical reaction and mechanical erosion by pumping hydrochloric (HCl) acid through conventional CT and a bottom-hole assembly (BHA) with jetting nozzles and two pressure-activated bending joints that control the tunnel initiation directions. If the jetting speed is too high and the acid is not consumed in front of the BHA during the main tunneling process, then unspent acid flows toward the back of the BHA and creates main wellbore and tunnel enlargement with potential wormholes as fluid leaks off, lowering the tunneling length efficiency. Full-scale water and acid jetting t

Author

Livescu, S.; McDuff, D.; Comeaux, B.; Singh, A.; Lindsey, B. J.

Publisher

Society of Petroleum Engineers

Published

2019

Language

EN