Abstract
Many hydraulic fracturing treatments have been carried out for producer wells selection with low permeable formation in the primeval sedimentary of the White Tiger field to increase the permeability of the reservoir and increase the fracture conductivity, leading to an increase the productivity index. Several treatments recorded a higher fracture growth in comparison with the effective reservoir thickness, resulting in poor proppant distribution within the fractured reservoir, and shorter propped length, and narrower propped width, resulting in poorer propped fracture conductivity. In this study, the optimally designed the optimal propped length and propped width using Unified fracture design (UFD) in combination with symmetrical fracture height evolution with a pseudo-three-dimension model (p-3D) for three-layered formation under the constraint of maximum proppant distribution per unit fracture area created, or optimum dimensionless productivity index for the low permeability reservoir. Results for a single well production fracturing case in the upper Oligocene formation have been obtained with such fracture height migration of 124.1 ft, pay zone thickness of 120 ft, propped fracture half-length of 298 ft, propped fracture width of 0.18 in, propped fracture conductivity of 660 mD.ft, the highest percentage of proppant placement in the pay zone at 96.7% by 125,710 lbs of proppant size 16/30 of Sintered Ball Bauxite (SBB), mass of propped used 130,000 lbs, effective reservoir-reservoir efficiency is 125,710 lbs. In addition, the sensitivity analysis of in-situ stresses and fracture toughness of the overlying layers and the underlying layers under treating pressure influenced by fracture height migration have been discussed.
