Abstract

In today’s challenging world of exploration, Hydro Fracturing (HF) is an important tool in the oilfield arsenal that enables operators to understand the formation potential deliverability. More and more companies today are adopting hydrofracturing as part of the exploration strategy for better quantification of hydrocarbon production. GSPC decided to precisely do this in their Tarapur asset due to very low rates of production post drilling phase.

GSPC has drilled quite a few wells in the Tarapur field which is located near the Ahmedabad city. In order to verify the ultimate producability of these formations, hydraulic fracturing is the most suitable strategy. 6 wells, which showed presence of oil, were chosen as the stimulation candidates for the production enhancement and production potential identification from this field. This project primarily focused on the exploration and development of the Kalol Sand of the Tarapur field.

The entire HF operation consisted of two parts known as the Datafrac and the Main Fracturing Treatment. Datafrac was done to estimate critical formation and fluid parameters such as like fracture closure pressure, Fluid Efficiency and Leakoff Coefficients which all are determined to design the most optimum job for maximizing ultimate recovery. Reservoir transmissibility validation was also performed via the injection test that is done as a part of the Datafrac injection test.

This paper discusses the planning and design processes leading to the successful execution of the hydro frac treatments and the post-stimulation results. The experience and lessons learned during the stimulation treatment design, execution and post-stimulation results will be discussed. Lessons learned from this successful experience are discussed as a way to enhance the benefits from this promising technology that will lead to more successful developments of the exploration wells in India.

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