Abstract

ASP flooding has been most pertinent among the chemical IOR techniques because it has proven most promising depending on the candidate reservoir.

This paper presents the studies of the applicability of ASP flooding in depleted reservoirs in the Niger Delta and reservoirs of similar geologic formation for reasonable incremental oil recovery. The rate of recovery of oil from the reservoir using four different core samples (A, B, T and R) as well as the displacement efficiencies of all four core samples were comparatively analyzed. The fluid flow mechanism of ASP flooding to economically mobilize the residual oil through analyzing production performance was studied. Oil of API gravity of 42.86 degrees and viscosity of 2.5cp and core samples from a Niger delta field were used. 1% wt of NaOH, 0.15% wt of Shell Enordet 0242 and 0.02% wt of Hengfloc 63020 were the alkali, surfactant and polymer used respectively. A sequence of experimental procedure of brine saturation, oil saturation, water flooding and ASP flooding was carried out on the core samples. High pressure core holder, pressure transducer + digital display, digital camera and confining pressure pump were among the instruments used to accomplish the studies.

The results show potential to recover significant additional oil by ASP flood after the 10% recovery factor common to a large number of conventional oil reservoirs in the Niger Delta to date. The reservoir rock shows favourable response to the ASP flooding mechanism, recovering a reasonable percentage of the OOIP which is definitely handy for resolving the declining marginal fields in the Niger delta.

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