A Small-Scale Fracture-Conductivity Study Academic Article uri icon

abstract

  • A series of acid-fracture-conductivity tests was performed, simulating flow in a hydraulic fracture, both in the main flow direction along the fracture and in the fluid-loss direction. Three commonly used acid-fracturing fluids (a gelled-acid system with an acid-soluble polymer as a gelling agent, an acid-in-oil emulsion, and an acid/viscoelastic-surfactant acid solution) were evaluated at 200° and 275°C. The polymer-gelled-acid system contained 15% HCl, 2.5% gelling agent, and a corrosion inhibitor. The emulsified acid was a mixture of 28% HCl and diesel with an emulsifier and a corrosion inhibitor. The fluid viscosity increases significantly as the acid spends, which creates effective diversion of the acid in matrix acidizing. At a low closure stress of 1000 psi, the conductivity increases gradually with increased acid contact time, ranging from ∼ 17,000 md-ft for the 15-min-contact-time experiment to ∼ 36,000 md-ft for the 60-min test.

altmetric score

  • 3

author list (cited authors)

  • Bybee, K.

citation count

  • 0

publication date

  • July 2007