基于物性及压降速率的新型压力指数研究与应用

Research and application of a new pressure index based on physical properties and pressure drop rate

针对传统PI决策技术和FD决策技术在调剖选井决策中考虑参数过于简单且区分度小、可比性差等带来的调剖选井误差问题,提出一种新型压力指数以指导调剖选井决策。新型压力指数既考虑了储层及流体物性,又考虑了压降速率,同时规避了关井时间和关井前排量带来的影响,从而有效规避常规压力指数PI、充满度FD及已有成果中的计算复杂性,能够更加准确地指导调剖选井。研究表明:新型压力指数既考虑了储层物性、注入流体黏度,又考虑了注入井压降速率及PI值,能够更加准确地反映注入井的压力传播能力。矿场应用结果表明,新型压力指数的决策结果相较于传统的PI决策和FD决策方法,能更灵活、准确地指导注入井调剖选井,从而提高决策的准确性。该研究成果为油田调剖选井提供了重要的技术支持。

Aiming at the problem of profile control and well selection errors caused by the traditional PI decision-making technology and FD decision-making technology in the decision-making of profile control and selection of wells,a new type of pressure index is proposed to guide the selection decision of profile control well.The new pressure index not only considers the physical properties of the reservoir and fluid,but also the pressure drop rate,while avoiding the impact of shut-in time and displacement before shut-in,thereby effectively avoiding the conventional pressure index PI,fullness FD,and existing computational complexity in the results,so it can more accurately guide profile control and well selection.The research results show that the new pressure index not only considers the physical properties of the reservoir and the viscosity of the injected fluid,but also the injection well pressure drop rate and PI value,and can more accurately reflect the pressure propagation capability of the injection well.Field application results show that compared with the traditional PI and FD decision-making methods,the decision-making results of the new pressure index can guide injection well profile control and selection more flexibly and accurately,thereby improving the accuracy of decision-making.The research results provide important technical support for profile control and well selection in oilfields.