An evaluation of CO/sub 2/ huff 'n' puff tests in Texas
Field experience in 28 Texas CO/sub 2/ huff 'n' puff projects is presented and discussed. In the absence of mechanical problems, CO/sub 2/ huff 'n' puff can recover oil from 23- to 30/sup 0/API Texas gulf coast Miocene reservoirs. Shorter soak times (10 to 17 days) recovered as much oil, or more, as longer soak times for 2- to 3-cp crudes. Injection of larger volumes of CO/sub 2/ (8 MMscf instead of 4 MMscf) resulted in greater incremental oil recovery of a 33-cp crude. Oil-cut response can guide in the selection of wells to receive multiple cycles of CO/sub 2/. Two simple predictive methods are presented for estimating incremental oil recovery from CO/sub 2/ huff 'n' puff. One is from the literature and the other was developed for the Texas reservoirs, where oil swelling and viscosity reduction are important oil recovery mechanisms. Although predictions from both methods show modest agreement with field production, the method developed specifically for the Texas cases has the advantage of being based only on fluid properties, which are easy to measure or to estimate accurately.
- Research Organization:
- Texaco Inc., Houston, TX (US)
- OSTI ID:
- 6314252
- Journal Information:
- J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 41:2; ISSN JPTJA
- Country of Publication:
- United States
- Language:
- English
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