Research And Application Of Deep Profile Control Of The Water Injection Wells In Low-permeability Oilfield

According to the production history and dynamic changing of the improved block(wells), the paper sum up block(wells) water flooding rule and water breakthrough type. In addition to conventional dynamic data analysis, the earth potential monitoring technology and3D streamline numerical simulation technology are used to identify the dominant channel of the wells, deepening the theoretical direction of the formation distribution and the water flooding direction of high water content oil Wells.The plugging agent that adapt to the different formation conditions series are researched, including low cost inorganic plugging agent and weak gel system. Through the process analysis of the profile control wells over the years,those below are optimized reprectively, such as working technological parameter,working appliance, slug array and profile control moment. Finally, the process parameter principle is determined that is "high doses, low concentration and small displacement", as well as the different formation uses the slug array the relevant plugging agent.Through statistical water shutoff profile control of35injection wells in panguliang oil field,69oil wells are effective among228oil wells.the water content was decreased from39.9%to34.3%, oil wells increased6438tons, and water was decreased7173cubic meters. Through the entire deep profile control of injection wells in Bai209block, the water intake thickness of the single well was increased15.3m to15.6m, waterflooding degree was increased from65.0%to66.3%, decreased from12.0%to17.2%under the natural decline rate, and water cut ascension was decreased from8.0%from4.6%, the above effect indicates that the deep waterflooding profile control technique is practicable in low-permeability oil field.