Gathering System Of Deposition, Suspended Solids Trace Analysis In ASP Flooding

Asp flooding recovery is an important technical measure at late stage of oilfield development. Since 2009, EOR blocks of Daqing oilfield have abandoned polymer flooding and adopted Asp flooding in an all-round way, with the wide use of Asp flooding, scale phenomenon exist in near bore zones and produced fluid. Theexistence of scale production not only cause hidden troubles to production, reduce production efficiency, increase production costs, restrict the wide application of technology of Asp flooding.This paper takes actual situation in 4 factory of Daqing oilfield as an example, studies interaction of produced fluid of Asp flooding recovery and strata rocks in oilfield exploitation process, analyzes cause of scaling of Asp flooding, and get the scaling mechanism of Asp flooding produced liquid.The thesis researches on the properties and synergetic effects of ASP chemical agents on the basis of the flooding mechanism of ASP flooding, and then discusses theoretically about the influencing factors of displacing efficiency in ASP flooding process. Under Daqing reservoir conditions, we research on properties of interfacial tension between five different kinds of ASP chemical system and crude oil, and screen out three kinds of chemical systems that have different order of magnitudes of interfacial tension, and then we carry out core flooding experiment both on heterogenrous and homogeneous synthetic cores and discuss about the correlation among permeability, interfacial tension, wettability and displacing efficiency in ASP process. The result demonstrates: interfacial tension is the primary factor that improves displacing efficiency in ASP flooding; the interfacial tension between the ASP chemical system and the oil, including balance and instantaneous dynamic interfacial tension, make remarkable influence on displacing efficiency in ASP flooding process; the balance interfacial tension between oil and water falls to the level of 10-3mN/m is only a sufficient condition but not a necessary condition for enhancing the oil recovery greatly; the wettability of the rock makes an obvious influence on saturation degree of core as well as ASP flooding efficiency. With the increase of the wetting contact angle, the displacement efficiency increases obviously in ASP flooding process; under the condition that the composition and concentration of chemical agents, the displacement efficiency is a bit higher in the core of moderate permeability.