Differential countermeasures for Ordovician reservoirs in X area, Tahe oil field

The X area is located in the northeastern structural high of the Tahe oil field. The surface of Ordovician weathering crust is lower in the south and higher in the north. Monadnocks are well developed in the study area. Fractures and caves work as the main reservoirs. Due to poor connectivity, the dynamic characteristics of hydrocarbon exploration vary among areas. The central and western parts, with well-developed reservoirs, are abundant in hydrocarbon. The western part faces a risk of bottom water coning, hence is difficult to stabilize crude output. Wells in the central part have poor formation energy, and show a low recovery rate. The southeastern area has a relatively lower tectonic location and thin hydrocarbon layer, is featured by fast water-cut rising and poor water control effect. For differential characteristics, based on dynamic and static analyses, this study presents some corresponding countermeasures, such as reasonable mining speed control, injecting water to replace oil, water injection unit, single and unit well gas injection. Besides, this study deepens the knowledge on Ordovician reservoir exploitation, improvea area productivity to a certain extent, and slows down oil production decline. Furthermore, this study provides a guidance and reference significance to expand productivity construction and improve producing reserve.