Reservoir adaptability and mechanism of salt-resistant polymer

Key words:  salt-resistant polymer  oil displacement effect  conditioner  hydrophobic associating polymer  polymer molecular aggregations  adaptability analysis

Abstract:

On the basis of the physical simulation results, the oil displacement efficiency of salt-resistant polymer (such as polymer-surfactant and branched polymer) has been evaluated and analyzed. For the hydrophobic associating polymer, the following evaluating indicators, such as polymer viscosity, molecular clew dimension, molecular aggregations, transmission ability and oil displacement effect were used to investigate the influence of association degree on reservoir adaptability of hydrophobic associating polymer. And the reservoir adaptability of salt-resistant polymer has been discussed as well. It is found that there is no connection between the oil displacement efficiency and viscosity of salt-resistant polymer. And the reservoir adaptability of salt-resistant polymer is closely related to its polymer molecular aggregations. When molecular aggregations change, its transmission ability in porous media and adaptability with heterogeneous reservoir also change correspondingly. When developing salt-resistant polymer to increase solution viscosity through changing space configuration of its molecular aggregations and evaluating its reservoir adaptability, the viscosity should not be paid excessive attention. Instead, it is the adaptability between polymer molecular aggregations and heterogeneous reservoir that should be emphasized.