低渗油藏压力恢复试井测试实例解释研究

Study on test case interpretation of build-up well test in low permeability reservoir

试井压力曲线的相似性导致难以量化分辨储层发育、渗流机理、油水关系、井筒-地层耦合的复杂性及其差异,多解性强,缺少明确的理论指导和普适性好的解释方法。利用现场低渗储层压力恢复试井资料,开展常规试井解释和低渗透油藏试井解释对比分析。通过归纳分析,从解释成果的可靠性和合理性论证了复合模型的适用性和裂缝模型应用的不确定性,提出了在研究的典型超低渗储层中,复合模型是压力恢复试井解释首选模型。低渗透油藏压力恢复试井过程中,即使没有出现压力导数水平段,依然可以得到较可靠的渗透率。

Because of the similarity of well test pressure curve,the reservoir development is difficult to distinguish,the filtrate mechanism,relationship between the oil and water and coupled bore and formation become complex.There always are multiple solutions.Well test pressure curve lacks clear theoretical guidance and good universal interpretation methods.Using field build-up well test data in low permeability reservoir,conventional analysis for well test and well test analysis of low permeability was compared.According to analysis,the applicability of composite model and the uncertainty of fracture model were demonstrated from the reliability and rationality of interpretation results.And composite model is the first chose model for build-up well test interpretation in studied type super low permeability reservoir.The reliable permeability can be obtained as before even there was not derivative stabilization level of pressure.