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Collaborating Authors
Results
Identifying Bypassed Oil In CaÑO Limon With The Carbon/Oxygen Log
Becerra, Marta Elena (Occidental de Colombia) | Hampton, David W. (Occidental de Colombia) | Mancilla, Diana (Occidental de Colombia) | Diaz, Jules (Occidental de Colombia) | Rolon, Rafael (Occidental de Colombia) | Mackualo, Helbert (Occidental de Colombia) | Salgado, Alejandro (Occidental de Colombia) | Goddyn, Xavier (Schlumberger) | Angel, Juan (Schlumberger) | Patiño, Cesar (Ecopetrol)
ABSTRACT: Caño Limon is one of the giant fields discovered in the 1980s in Colombia. As part of the Llanos basin, the field contains many prolific sands distributed between Eocene Mirador and Upper Cretaceous, containing 29 API low GOR, with a strong fresh meteoric water edge-drive aquifer. Maintaining the current production rate in a mature field is challenging, and requires dedication from the production and geoscientist teams to locate undeveloped sands. During 2010 and 2011 the Occidental Llanos Reservoir Management Team implemented an extensive workover campaign to locate bypassed oil sands, monitor the current level of saturation, and understand current drainage and imbibitions mechanisms for each area. This campaign included logging approximately 30 wells, with pulsed neutron tools in Carbon/Oxygen mode in order to differentiate between hydrocarbons and low salinity connate water or fresh water from the aquifer. Wells in the field typically have ESP pumps with Y-tools installed. The logging tool is capable of passing through the Y-tool to acquire both yield and windows carbon-oxygen data in order to ensure an accurately computed oil saturation (So). The logging campaign has been effective in locating bypassed oil and nearly undrained sands. Based on these interpretations, the reservoir team was able to propose new producer wells. The results demonstrate that these tools are helpful in sustaining field development. The methodology is applicable in many brown fields where similar conditions exist. One of the most important factors in managing reservoirs is an accurate determination of oil saturation. The accuracy of this value is critical in tracking reservoir depletion, designing enhanced oil recovery, identifying workover strategies and understanding water injection breakthrough, especially in Caño Limon, where small variations in oil saturation can signify a large volume of hydrocarbons. This problem is complicated by variable water salinities caused by the aquifer influx.
- South America > Colombia (1.00)
- North America > United States > Texas (0.87)
- South America > Colombia > Llanos Basin (0.99)
- South America > Colombia > Arauca Department > Llanos Basin > Cano Limon Field (0.99)
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- (34 more...)
ABSTRACT: The Belridge oil field in central California was discovered in 1911 and has since been developed by over 25,000 wells, the majority drilled in the last 40 years. The field has three radically different reservoir types (each with unique petrophysical and fluid properties) that are completed in very different ways. Early wells only had drillers' penetration records and the first electric log was recorded in 1934. From 1934 to 2001 open-hole logs were acquired in almost all of the more than 25,000 wells but with a variety of curve types, curve qualities, and service companies. For the past 10 years, because of the wealth of existing petrophysical data and very close well spacing, we have logged only about 30–50% of the 600–700 new wells drilled each year. There are also over 450 wells with open-hole pressure surveys (20–30 points per well) and over 250 wells instrumented with optic fiber. The result is a vast amount of petrophysical data that at first glance seems desirable. At a second glance it may seem challenging. Finally, at a third glance, we realize that it will be a nightmare unless we can sort it, clean it, decide what parts of the data are required for analysis, and what analysis is needed. The various end-users of the petrophysical data have different needs and perceptions of log value: some need only historical data to find original oil-in-place volumes, others want to measure current oil saturations to monitor changes due to water- or steam-flooding, while others need only detailed pressure and temperature data and regular wireline data has little value. Reservoir characterization and simulation modeling also have their own petrophysical requirements. However, regardless of need, all users want their petrophysical data to be clean, correct, and fit for their purpose.
- North America > United States > California > Kern County (1.00)
- South America (0.93)
- Geology > Sedimentary Geology (0.68)
- Geology > Geological Subdiscipline > Stratigraphy (0.68)
- Geology > Rock Type > Sedimentary Rock > Clastic Rock > Sandstone (0.46)
- North America > United States > California > San Joaquin Basin > South Belridge Field > Tulare Formation (0.99)
- North America > United States > California > San Joaquin Basin > South Belridge Field > Diatomite Formation (0.99)
- North America > United States > California > San Joaquin Basin > San Joaquin Valley > Tulare Formation (0.99)
- (15 more...)
- Reservoir Description and Dynamics > Reservoir Characterization > Exploration, development, structural geology (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Waterflooding (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Thermal methods (1.00)
- (2 more...)
- Information Technology > Information Management (0.68)
- Information Technology > Data Science > Data Quality (0.46)