In:
SPE Production & Facilities, Society of Petroleum Engineers (SPE), Vol. 12, No. 02 ( 1997-05-1), p. 123-128
Abstract:
This paper presents a model of foam rheology in porous media, based on a set of experimental data gathered in linear cores at rates relevant to matrix-acidizing conditions. Foam was found to behave as two-phase flow, with a minimum yield stress required to displace the gas phase. At high foam rates, foam was highly shear-thinning, and the pressure gradient within the foam bank was observed to be independent of the foam rate. It was also found that nitrogen solubility in the aqueous phase can explain the long-term behavior of foam banks under brine flow. The modeling is applied to foam-flow simulation. In a two-phase finite-difference simulator, foam flow is represented by modifying the relative permeability to gas at each timestep, as a function of the injection conditions. Surfactant transport and adsorption and gas solubility have also been integrated into the simulator. Comparisons between simulation results and diversion experiments are presented, and the possibility of extension to field conditions is demonstrated by simulation of a hypothetical field case. Finally, the effects of surfactant adsorption and foam-injection conditions on diversion efficiency are briefly discussed.
Type of Medium:
Online Resource
ISSN:
1064-668X
Language:
English
Publisher:
Society of Petroleum Engineers (SPE)
Publication Date:
1997
detail.hit.zdb_id:
2765065-0
SSG:
19,1
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