2017_EJRNL_PP_ZHIFENG_LUO_1.pdf
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Conventional stimulation methods such as matrix acidizing, acid fracturing, or proppant fracturing have
resulted in products that perform poorly and/or fail within months. Other options, such as water fracs
with light sand, give better results but are prohibitively expensive. Mineral composition, brittleness
index, stress regime, and petrophysical properties, which are favorable for creating complex fracture
networks, can be obtained by geochemical and geomechanical analysis. The extended Reshaw and
Pollard criterion shows that hydraulic fractures tend to be arrested by pre-existing natural fractures, and
complex fracture networks would be created during fracturing. Additionally, the critical stressed faults
theory indicates that the pre-existing natural fractures tend to slip with the shear mode as the pore fluid
pressure increases. Rotating disk experiments and conductivity tests with artificial sheared plates have
shown that flow channels can be etched at the location of scratches on fracture surfaces. Meanwhile, the
carbonate cement in natural fractures can be chelated to form wormhole likely flow channels. Complex
fracture networks with sufficient acid etched conductivity can be generated by water fracs with acid. A
novel and economical volume stimulation strategy known as network acid fracturing has provided Tarim
Oil Company the means to develope ultra-deep, ultra-high pressure, high temperature, and ultralow
permeability but fractured gas reservoirs. Post-stimulation production performances of numerous wells
with network acid fracturing are comparable to those with stimulated reservoir volumes