(2015039) CARBONATE ACIDIZING-DESIGNING FOR SUCCESS
Oil and gas production is from conventional and unconventional formations, with both requiring some form of stimulation. Limestone and dolomite are considered conventional formations which are stimulated with various treatments, either above fracturing pressure or below. Treatments above fracturing pressure are hydraulically created cracks that use either proppant or acid to maintain flow paths after closure. Treatments at pressures below fracturing use acids to create wormholes that penetrate into the reservoir bypassing any near wellbore damage.
This paper will provide an overview of the process that should be implemented in the design of an acid stimulation treatment to provide the best opportunity of successful production improvement. Specifically being addressed are the criteria that defines the need for an acid fracture treatment over a propped treatment, staging and diversion to obtain better zone coverage, how to overcome temperature limitations, etc.