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Title: Advanced reservoir characterization and evaluation of CO{sub 2} gravity drainage in the naturally fractured Spraberry Trend Area. Annual report, September 1, 1996--August 31, 1997

The overall goal of this project is to assess the economic feasibility of CO{sub 2} flooding the naturally fractured Spraberry Trend Area in West Texas. This objective is being accomplished by conducting research in four areas: (1) extensive characterization of the reservoirs, (2) experimental studies of crude oil/brine/rock (COBR) interaction in the reservoirs, (3) reservoir performance analysis, and (4) experimental investigations on CO{sub 2} gravity drainage in Spraberry whole cores. This report provides results of the second year of the five-year project for each of the four areas. In the first area, the author has completed the reservoir characterization, which includes matrix description and detection (from core-log integration) and fracture characterization. This information is found in Section 1. In the second area, the author has completed extensive inhibition experiments that strongly indicate that the weakly water-wet behavior of the reservoir rock may be responsible for poor waterflood response observed in many Spraberry fields. In the third area, the author has made significant progress in analytical and numerical simulation of performance in Spraberry reservoirs as seen in Section 3. In the fourth area, the author has completed several suites of CO{sub 2} gravity drainage in Spraberry and Berea whole cores atmore » reservoir conditions and reported in Section 4. The results of these experiments have been useful in developing a model for free-fall gravity drainage and have validated the premise that CO{sub 2} will recover oil from tight, unconfined Spraberry matrix. The final three years of this project involves implementation of the CO{sub 2} pilot. Up to twelve new wells are planned in the pilot area; water injection wells to contain the CO{sub 2}, three production wells to monitor performance of CO{sub 2}, CO{sub 2} injection wells including one horizontal injection well and logging observation wells to monitor CO{sub 2} flood fronts. Results of drilling these wells will be forthcoming.« less
Authors:
Publication Date:
OSTI Identifier:
663421
Report Number(s):
DOE/BC/14942--6
ON: DE98007451; TRN: AHC29818%%258
DOE Contract Number:
FC22-95BC14942
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jul 1998
Research Org:
Pioneer Natural Resources, Midland, TX (United States)
Sponsoring Org:
USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; PROGRESS REPORT; TEXAS; OIL FIELDS; CARBON DIOXIDE INJECTION; ROCK-FLUID INTERACTIONS; SITE CHARACTERIZATION; RESERVOIR ROCK; WETTABILITY; FLOW MODELS; EXPERIMENTAL DATA