Abstract
A new technique for characterizing secondary and tertiary reactions during sandstone matrix stimulation treatments is presented. In the new technique, traditional experiments on short reservoir cores are supplemented with measurement of the effluent element concentrations, batch reactor experiments and geochemical simulations to predict the extent of secondary and tertiary reactions in the reservoir treatment. Alternative methods of characterizing secondary and tertiary reactions, such as those using long core flow tests and laboratory radial flow setups, are reviewed.
The new design technique is used in designing a treatment for a well in the North Sea. Details of how this technique was applied to the treatment design are presented. Post-treatment data from the well showed a successful matrix treatment design. The production from the well increased by 1,400% immediately after the treatment. The 3-month stabilized production gain was 650%.
