A Field Experiment of Steam Drive with In-Situ Foaming, Status Report, October 1980-September 1982

Screening, evaluation and optimization of the steam flooding process in homogeneous reservoirs can be performed by using simple analytical predictive models. In the absence of any analytical model for layered reservoirs, at present, only numerical simulators can be used. And these are expensive. In this study, an analytical model has been developed considering two isolated layers of differing permeabilities. The principle of equal flow potential is applied across the two layers. Gajdicas (1990) single layer linear steam drive model is extended for the layered system. The formulation accounts for variation of heat loss area in the higher permeability layer, and the development of a hot liquid zone in the lower permeability layer. These calculations also account for effects of viscosity, density, fractional flow curves and pressure drops in the hot liquid zone. Steam injection rate variations in the layers are represented by time weighted average rates. For steam zone calculations, Yortsos and Gavalas (1981) upper bound method is used with a correction factor. The results of the model are compared with a numerical simulator. Comparable oil and water flow rates, and breakthrough times were achieved for 100 cp oil. Results with 10 cp and 1000 cp oils indicate the need more »to improve the formulation to properly handle differing oil viscosities.

Caldwell Ranch Exploration and Confirmation Project, Northwest Geysers, CA: 2011 Geothermal Technologies Peer Review Project Summary The Caldwell Ranch Exploration and Confirmation Project was to drill, test, and confirm the present economic viability of the undeveloped geothermal reservoir in the Caldwell Ranch area. The objective of the project was to re-open and re-complete three wells abandoned in 1999 and 2000: Prati 5 (P-5), Prati 14 (P-14) and Prati 38 (P-38). The data and information collection included: (1) drilling and geology of the subject wells; (2) reservoir production flow rates, temperature, pressure, thickness, permeability, and rock fluid chemistry using new innovative combinations technologies and (3) a determination of present reservoir conditions in order to determine the feasibility of re-developing a steam supply.

NIPER-552

DOE/SF/10761-3

The data include compressive strength and Young's Modulus recoveries in steam and carbonate environments at 270 deg C for four chemically different cement composites after imposed controlled damaged.