Application of Completed Well Reevaluation Technique in Low Permeability and Porosity Reservoir

Reservoirs with low permeability and porosity are very common in the old exploration areas in East of the China. With low permeability, low porosity, they are hard to identify and exploit, thus are often lost at the initial stage of exploration. However, along with the gradual deepening exploration and exploitation in the old exploration regions, it has more important practical significance to strengthen the research, development and utilization of the reservoirs with low permeability and porosity. Tapping potential in the completed wells is to reevaluate and analyze the "dead wells" and "wells with low efficiency and no value", so that we can realize the purpose to make use of them once more. It has some characteristics such as small investment, low cost, small risk, quick efficiency, etc. It also has become one of the important methods to do well in tapping the potential and increasing the efficiency in the old regions and locating the wells. In recent years, the technologies of reevaluating and analyzing the completed wells have been applied in Henan Oil Field, and some important breakthroughs have been achieved in the low permeable and porous reservoirs such as Anpeng and Zhangdian oil fields. Some"dead wells" and "wells without efficiency" had turned out to be "gushing wells with high production". Magnificent social and economic benefit have been attained. The evaluation methods can play some reference and guidance roles in researching and developing the reservoirs with low permeability and porosity.