Study On Waterflooding Program Of Hanqu-Zhangtianqu Area, Dingbian

At the end of the twentieth Century, the administration of Yanchang oil field Dingbian Petroleum Company has been built and the right of development has been recovered, since then the development of Han qu-Zhang tianqu oilfield enters a new phase. From the year of2004, the flood has been started in this block. With the injection rate increasing and the exploitation, the water content ratio is rising. The water content ratio of the main layer of yanan group is big, the maximum more than90%. In order to solve the problem of rising water rate of oilfield, the well was flooded, and realize the purposes of oilfield stable production, we will to adjust the water injection scheme of the oilfield.Han qu-Chang tianqu oilfield is located in Dingbian County Shaanxi Province, geological structure of Erdos Basin Tianhuan depression salt containing oil zone set. The natural energy of the area is shortage. And because of the flood is late, energy of underground deficit serious. Therefore, to obtain a good development results, water energy development must be relied on. According to the reservoir characteristics, water injection well should contact more layers and have good connectivity, which is more than80%. On the plane, as much as possible to make the oil well multi-direction response, in order to ensure the injection-production pattern has higher control degree of water flooding and the levels of water driving reservoir, and prolong production period, to meet the requirements of oil well production.Studied oildom changes the oil water flooding system by adjustment in plane of the injection-production system and the longitudinal adjustment of injection-production layers. We will improve the formation pressure, increase water flooding swept volume, improve water drive reserves producing degree by the adjustment of injection-production well pattern; Also from the adjustment of through the water injection scheme, we can improve water drive efficiency and per well production, reduce the contenting water, so as to improve the block rate of recovery and to increase the ultimate recovery objective.