Alkaline/surfactant/polymer pilot performance of the west central Saertu, Daqing oil field
A tertiary pilot application of the alkaline/surfactant/polymer (ASP) process was initiated in Sept. 1994 in the west central area of Daqing oil field. The pilot pattern consists of four inverted five-spots, including four injectors, nine producers, and 2 observation wells, encompassing an area of 90,000 m{sup 2} and with a pore volume (PV) of 203,300 m{sup 3}. The target layer is the Saertu II{sub 1-3} (SII{sub 1-3}) sandstone, with an average porosity of 26% and permeability of 1.426 {micro}m{sup 2}. The crude-oil viscosity is 11.5 mPa{center_dot}s at reservoir temperature and the connate-water salinity is 6,800 mg/L. The pilot performance shows a pronounced response from ASP injection. The average pilot area oil production rate increased from 36.7 to 91.5 m{sup 3}/d, while water cut decreased from 82.7% to 59.7%. For the central well Po5, which is surrounded by injection wells, the oil production rate increased from 3.7 to 27.1 m{sup 3}/d, while water cut decreased from 84.0% to 45.8%. Numerical simulation results forecast that the oil recovery will be increased by 18.1% original oil in place (OOIP). Total pilot oil production as of March 1996 is 67,500 m{sup 3} of which 25,300 m{sup 3}, or 18.3% OOIP, is additional produced oil with the current oil cut of 29.7%.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 276191
- Journal Information:
- SPE Reservoir Engineering, Vol. 11, Issue 3; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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