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Solvent Stimulation in Two California Oilfields.

Lechtenberg HJ; Gates GL; Caraway WH; Baptist OC
NTIS: PB 237 849 :23 pages
This Bureau of Mines report investigates solvent injection as a means of increasing oil production from low-gravity oilfields; thus, wells in two California oilfields that produce from reservoirs having low-gravity oil were injected with highly aromatic solvents to increase their oil recovery. The wells were either allowed to soak or the solvent was circulated for a period of time. In some of the wells, the solvent was followed by a slug of water. The post- stimulation production rate was considerably higher than the prestimulation rate of the wells. Wells in which the solvent was not followed by water showed an immediate increase in oil production, and essentially all of the solvent was recovered. The wells in which solvent was followed by water essentially showed a delay in the increase in oil production, thus indicating a temporary water block. The results show that the production rate is usually increased by the injection of solvent, and the method may prevent early abandonment of marginal producers. Cumulative post- stimulation oil production indicates that cyclic solvent injection treatment can be an economic success.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
RI 7978
NIOSH Division
Source Name
NTIS: PB 237 849
Page last reviewed: December 10, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division