Matrix-Fracture Interface Cleanup Protocol for Tight
Sandstone and Carbonate Reservoirs
Tadasse W. Teklu, Najeeb Alharthy, Waleed S. AlAmeri, Hossein Kazemi,
and Ramona M. Graves
Summary: A novel approach to clean up the matric-fracture interface to improve oil and gas
Description: Water blockage and precipitation of larger molecular weight hydrocarbon
components at the matrix-fracture interface can decrease oil and gas production in tight
sandstone and carbonate reservoirs. This invention is of a method to clean-up the matrix
fracture interface to improve oil and gas production. The approach involves a protocol to inject
a) carbon dioxide followed by surfactant, b) surfactant followed by carbon dioxide, c) carbon
dioxide alone, or d) surfactant solution alone, into tight sandstone or carbonate reservoir
producer well. Carbon dioxide and/or surfactants clean-up water blocks and larger molecule
weight hydrocarbon components precipitated at the interface and also reduce oil viscosity at
the fracture-matrix interface. The same procedure can be applied into injection well to improve
Main Advantages of this Invention:
 Increases injectivity and
Potential Areas of Application:
 Oil and Gas
ID number: 15007
Intel ectual Property Status: US
provisional application filed
Opportunity: We are seeking an
exclusive or non-exclusive licensee for
implementation of this technology.
Fig. 1— Matrix-Fracture interface cleanup with CO2 followed by anionic
or non-ionic surfactant.
For more information contact:
William Vaughan, Director of Technology Transfer
Colorado School of Mines, 1500 Illinois Street, Guggenheim Hall Suite 314, Golden, CO 80401
Phone: 303-384-2555; e-mail: