Based on the major Tarim sandstone oil reservoirs, with seven typical reservoirs as the fundamental study units, some relevant researches are conducted, which include changing patterns and their major contributing factors analysis of production decline rate, water content increase rate, ratio of reserve to production (R/P ratio) and balance index of reserve to production. The production decline rate change rules and its major contributing factors have been specifically analyzed quantitatively. It is believed that, comparing with domestic and foreign land reservoirs, the major sandstone reservoirs have made satisfactory progress. After a period of high-yield and stabilized production, the reservoir development has entered a comprehensive adjustment and low yield stage. In the decline stage, the production decline rate is high and the R/P ratio is in a low level.

Through the studying of R/P ratio and balance index of reserve to production of different kinds of reservoirs, rational boundary of R/P ratio has been defined, reasonable development system's establishment and technical development policy for 8-to-10-year stable production have been proposed.

The research indicates that, multilayer developments, multi-adjustments and pressure maintenance development are all necessary to keep the oil production stable. Through well pattern thickening, injection-structure adjusting and hydro-dynamic method, water-flood recovery can be increased by 8.7%. Thus the major sandstone reservoirs can keep stable production by 2015. However in the long run, the potential of increasing recoverable reserves by water drive is limited. For technological breakthrough in reserve replacement, the author suggests speed up the research and experiment of gas injection method to enhance recovery. These research results have already been applied in the annual plan as well as in the oil field plan for the next five years.

You can access this article if you purchase or spend a download.