抗盐聚合物储层适应性及其作用机制

基于物理模拟实验结果,对抗盐聚合物(枝化聚合物、聚表剂)驱油效果进行评价与分析,对于疏水缔合聚合物,以聚合物溶液黏度、分子线团尺寸、分子聚集态、传输运移能力和驱油效果等为评价指标,考察缔合程度对疏水缔合聚合物油藏适应性的影响,探讨抗盐聚合物的储层适应性。结果表明:抗盐聚合物的增油效果与其黏度之间没有必然联系;抗盐聚合物油藏适应性与其聚合物分子聚集体形态密切相关,当其聚合物分子聚集体形态发生改变时,其在多孔介质内的传输运移能力及其非均质储层适应性随之改变;改变聚合物分子聚集态空间构型增加水溶液黏度的抗盐聚合物、评价其储层适应性时,不应过度关注其黏度指标,而应注重其分子聚集体与非均质储层间的适应性。

Reservoir adaptability and mechanism of salt-resistant polymer

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.