Title:

An Evaluation of Geopressured Brine Injectability

Authors:

L.B. Owen, C.K. Blair, J.E. Harrar, R. Netherton

Geo Location:

Chocolate Bayou, Texas

Conference:

Stanford Geothermal Workshop

Year:

1980

Session:

Geopressured Systems

Language:

English

File Size:

382KB

View File:

Abstract:

New concepts for the high temperature/high pressure recovery of methane from geopressured brine have been developed by Lawrence Livermore National Laboratory (LLNL). 1-2 The primary objective of these methane recovery processes is to preserve sufficient hydraulic energy to drive the subsequent subsurface disposal of spent brine effluents at substantial reductions in operating and maintenance costs associated with use of injection pumps. However, a key element in determining the feasibility of the overall methane recovery process is the need to quantitatively establish inject-ability characteristics of geopressured brine at elevated temperature and pressure.

We have developed an apparatus with a capability or evaluating geopressured brine injectability at elevated pressures and temperatures. The apparatus utilizes membrane filters as injection zone reservoir analogs and permits injectability tests to be performed in accordance with Barkman and Davidson Methology. A field evaluation of geopressured brine injectability was completed during September 22-25, 1980 at the DOE, Brazoria testsite in Texas. Membrane filters, with pore sizes of 0.4-pm and 10.0-pm, were used as the basis for obtaining suspended solids data and for developing performance-life estimates of typical spent brine injection wells. Field measurements were made at 1300C and line pressures up to 3800 psig. Scale inhibited(phosphonate-polyacrylate threshold-type, carbonate scale inhibitor), prefiltered scale-inhibited, and raw (untreated) brine were evaluated. Test results indicated raw brine was highly injectable, while scale inhibited brine had extremely low quality. The poor injectability of scale-inhibited brine resulted from partial precipitation of the scale inhibitor.


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