The first of its kind horizontal 'proof of concept' well, in India, Cambay-76 was drilled into the Late Eocene tight hydrocarbon reservoir of the Cambay Basin and completed with an Open Hole Multi-Stage (OHMS) swell packer completion. Drilling and completion operations were followed by another first of its kind in India, multi-stage hydraulic fracturing treatment of the Eocene EP-III/EP-IV zone. The hydraulic fracture jobs pumped the largest treatment fluid volumes in a well in India as well as placed the largest quantity of proppant in a single well in India. The application of horizontal well technology and multiple-stage hydraulic fracturing techniques has permitted the evaluation of “tight” hydrocarbons. The OHMS is comprised of eight (8) water-activated swell packer stages with two (2) ball actuated fracture ports per stage, totalling 16 fracture initiation points. Tests conducted on selected core samples from an offset well provided basic rock properties and rock mechanical properties that were used in the fracture design and planning. After closure analysis (ACA), following a minifrac, provided reservoir properties to aid in production forecast. Microseismic monitoring was employed during all fracture treatment phases and provided data to determine the fracture geometry. Information obtained from the microseismic was used in hydraulic fracture simulator software to generate a Discrete Fracture Network (DFN) model to allow visualization of the generated discrete fracture network. This paper describes the lessons leant in the development of a tight hydrocarbon reservoir and demonstrates that the “proof of concept” can be scaled up across unconventional reservoirs in India. Extensive laboratory studies using formation cores and Microseismic monitoring results are also presented.
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