Abstract

A stimulation vessel has pumped the first hydraulic fracture treatments in high-pressure, high-temperature (HPHT) tight gas well in the Krishna-Godavari basin offshore India, spurring a four-fold increase in productivity.

The Krishna-Godavari basin holds one of the largest gas reservoirs in India, making it a highly prospective region for exploration. Initial analysis indicated that the tight gas formation would have to be hydraulically fractured to optimize productivity, but its high temperatures and pressures, and its location create challenges for both logistics and technology.

This paper will describe the process of designing and executing several hydraulic fracture treatments in an area with no prior stimulation history, and the results of the work. It will include laboratory evaluations of rock mechanics, mineralogy and permeability, as well as frac fluid stability and proppant pack conductivity at expected downhole temperatures of 400°F. It will also show how minifrac analyses were performed prior to the main frac treatments to verify assumptions about rock and fluid properties and optimize each treatment. Successful stimulation treatments were incorporated into the reservoir model, allowing a more detailed and realistic productivity forecast. Results demonstrated the economic value of including hydraulic fracturing in the full field development plan.

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