1887

Abstract

It is shown that in the laboratory a very high percentage of the waterflood residual oil can be recovered with low pressure inert gas injection, assisted by gravity drainage, from both water-wet and oil-wet samples. A mixed wet semipermeable paste assures the production of both oil and water but it prevents gas production. Stacks of short core plugs can be produced equally as a single long core if a coarse version of the mixed wet paste is used between adjacent plugs. In water-wet cores displacement of waterflood residual oil requires a positive spreading coefficient of oil on water in air. Parallel-type macroscopic heterogeneities in the formation may have relatively little effect on the course of oil recovery, but they prevent a uniform saturation to be established in the core cross-section. Microscopic pore scale heterogeneities decrease the recovery efficiency.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201411203
1991-05-21
2020-06-02
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201411203
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error