Fluid clean-up effects have hampered stimulation success in many tight, naturally fractured sandstone reservoirs. The petrophysical responses of treatment fluid invasion can affect short-term and in some cases long-term reservoir deliverability. Many times reservoirs such as the Wolfcamp intervals, in the Val Verde Basin of west Texas, exhibit better response to CO energized fluids than non-energized fluids. We will present data from a case study of several wells in the Wolfcamp A, C, and D intervals where CO-assisted fluid and 100% CO treatments have significantly improved productivity in both initial and remedial applications.

First, we will include case histories where CO-assisted fluid fracturing and refracturing treatments improved performance over non-energized, fluid treatments, Next, we will describe cases where injections of non-energized fluids systematically reduced production; in particular we will describe a case that was successfully remediated by a 100% CO treatment. Then, several cases will be presented showing sustainable improved responses following 100% CO treatments in previously energized and non-energized fracture stimulated intervals.

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