CO2 FOAM - RESULTS FROM 4 DEVELOPMENTAL FIELD TRIALS

Four pattern-scale CO2-foam field trials were conducted to determine t he effectiveness of foam in reducing CO2 channeling, to evaluate the e conomic potential of the process, and to develop application criteria and procedures. The trials were conducted under various process and ge ologic conditions so that the resulting technology would be applicable in a number of different CO2 floods. Two different surfactants, Rhoda pex (formerly Alipal) CD-128 and ChaserCD-1045, and two injection meth ods, alternating vs. coinjection of CO2 and surfactant, were tested in San Andres (west Texas) and platform carbonate (southeast Utah) reser voirs, In all, 161,000 Ibm of active surfactant was injected in the fo ur field trials, with one well undergoing foam treatment for as long a s 18 months. The treatments resulted in a significant reduction in gas production and indications of increased oil production. The total cos t of the four treatments (excluding labor and overhead) was $700,000.