... on the resulting fracture conductivity in a laboratory facility designed to perform acid-fracture-conductivity characterization. Gelled HCl acid systems with different degrees of acid spending were used to etch fractured cores under identical treatment conditions, which were set to mimic field conditions. Detailed...

...M. A. Buijse Summary In this paper, acid wormholing in carbonate formations is studied. The wormhole growth rate and the geometry of the final worm-hole pattern depend on the combined effect of acid spending and fluid flow. Acid spending is studied by modeling the wormhole as a cylindrical pore...

..., is incorrect. In tests performed at 1, 000 psi [7 MPa], the ability of foaming agents to retard acid reaction shows that gaseous CO 2 is still generated at the carbonate surface and affects reaction rate. To evaluate further the effect of pressure on acid spending, reaction rates were measured under...