Progress in crosswell induction imaging for EOR: field system design and field testing
- LLNL
At Lawrence Livermore National Laboratory (LLNL), we are continuing our effort to develop improved crosswell low-frequency electromagnetic imaging techniques, which are used to map in situ steamflood and waterflood movement during enhanced oil recovery (EOR) operations. Toward this effort, we procured two new borehole-logging field vehicles, and developed and integrated new crosswell electromagnetic transmitter and receiver data acquisition and control systems into these vehicles. We tested this new acquisition system by conducting a suite of background measurements and repeatability experiments at the Richmond Field Station in Richmond, California. Repeatability of a given scan in which the receiver was fixed and the transmitter position was varied over 60 m in 0.2-m increments resulted in amplitude differences of less than 0.6% and phase differences of less than 0.54 deg. Forward modeling produced a resistivity map fully consistent with well log data from the Richmond Field Station. In addition, modeling results suggest (1) that residual high-conductivity saltwater, injected in 1993 and pumped out in 1995, is present at the site and (2) that it has diffused outward from the original target strata. To develop crosswell electromagnetic imaging into a viable commercial product, our future research must be a two-fold approach: (1) improved quantification of system noise through experiments such as ferromagnetic core characterization as a function of temperature, and (2) development of procedures and codes to account for steel-cased hole scenarios.
- Research Organization:
- Lawrence Livermore National Lab., CA (US)
- Sponsoring Organization:
- USDOE Office of Defense Programs (DP) (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 14661
- Report Number(s):
- UCRL-ID-133468; AC1005000; AC1005000
- Country of Publication:
- United States
- Language:
- English
Similar Records
Crosswell electromagnetic tomography: System design considerations and field results
Monitoring of thermal enhanced oil recovery processes with electromagnetic methods