Oil & Natural Gas Projects
Exploration and Production Technologies
Development of Bypassed Oil Reserves Using Behind Casing Resistivity Measurements
The project was selected under the Research with Independents solicitation,
DE-PS26-02NT15377. The program is intended to assist small independent oil producers
in testing higher-risk technologies that could keep oil flowing from thousands
of U.S. fields.
Many productive zones of the Santa Fe Springs oil field in Los Angeles County,
CA, have been waterflooded, and more permeable sand layers have preferentially
watered out. It is suspected that flood fronts have bypassed lower permeable
oil saturated sand intervals. This project used cased-hole resistivity measurements
to identify higher oil saturated sands. Four wells were perforated and placed
on production to develop behind-flood-front oil sands in marginal stripper production
wells. If lower-sand potential exists, one well may be deepened.
Terra Exploration and Production Co.
Signal Hill, CA
The project has demonstrated the cased-hole resistivity measurement technology
in four wells in Santa Fe Strings oilfield in southern California.
Cased-hole resistivity measurements to identify unswept low permeability sands
will allow operators to more effectively produce zones in previously waterflooded
Potential oil reserves remain in selected turbidite sand sequences of Santa
Fe Springs oilfield. Many productive zones of the field have been waterflooded
where more permeable sand layers have preferentially watered out. It is suspected
the flood fronts have bypassed lower permeable oil saturated sand intervals.
The project used cased-hole resistivity measurements to identify higher oil
saturated sands. The successful application of this new, behind-pipe logging
tool has widespread application in the US and internationally.
There are five active producing wells on the Pedro-Nepple and Fulton leases
in Santa Fe Springs field. Four of the five wells range in depth from 3,841
feet to 4,505 feet. The deeper well, S.P. Pedro-Nepple #1, has a total depth
of 10,152 feet, thereby penetrating all of the sand intervals of the four offsetting
shallow production wells.
Tubing and rods of the S.P. Pedro-Nepple #1 well were pulled, and Schlumberger's
Cased Hole Formation Resistivity Tool (CHFR) was run in selected intervals.
The CHFR formation resistivity readings were compared with original open-hole
resistivity measurements. Separation between the original and CHFR resistivity
curves indicated swept sands. Both watered-out sand intervals and those with
high remaining oil saturations were identified. Logs were correlated to the
four nearby offset shallow wells. Up to four well workover projects were identified,
selectively perforated, and placed on production to develop potential new oil
reserves and increase overall well productivity. Deepening a shallow well was
Current Status (August 2005)
A no-cost extension was given the project, from February 14, 2005, to August
14, 2005, due to unforeseen delays caused by the unavailability of subcontract
rig services and unseasonably wet weather.
Project Start: June 30, 2003
Project End: August 14, 2005
Anticipated DOE Contribution: $100,000
Performer Contribution: $125,718 (55% of total)
NETL - Jim Barnes (firstname.lastname@example.org or 918-699-2076 )
Terra Exploration - Michael Conner (email@example.com or 562-427-3733)