This paper focuses on the potential of enhanced Hydraulic Fracturing (HF) techniques as a means to unlock the full potential of tight oil field reservoirs. The field X, discovered in 2010 in the KG Basin on-land, in Southern India, has presented a unique challenge for oil extraction due to its highly heterogeneous tight sand composition, with highly varying porosity and permeability, and high bottom hole temperatures up to 325-degF. Traditional methods of extraction have been financially unviable, making it necessary to find alternative methods to increase production.

Prior to 2017, several HF operations were carried out in the field X, but those attempts were unsuccessful due to limited understanding of the reservoir. To address these challenges, the reservoir was studied using several fracture diagnostic tests and a suitable and efficient fracturing fluid system was designed based on simple borate crosslinking to handle the high bottom hole temperature of up to 325-degF. Enhanced custom HF techniques were carried out on 10 wells with a total of 13 stages, reaching 330,700lbs per stage. The design models were optimized using HF simulators.

The heterogeneity of the field X, in the selected candidate wells for HF, presented challenges in the form of varying leak-off characteristics (with fluid efficiency ranging from 32-83%), tortuosity effects, permeability (ranging from 0.01-2mD) and several other reservoir attributes. However, through meticulous optimization of the fracturing process, a remarkable 8-fold increase in oil production was achieved, elevating production from 176 bopd (pre-HF campaign) to 1575 bopd (post-HF campaign). This outstanding success not only demonstrates the immense potential of enhanced HF but also serves as a blueprint for fully unlocking the productivity of tight oil field reservoirs like field X.

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