低渗透砂岩储层高聚能可控强冲击波增产增注机理研究

Explration and development of most of our national oilfiends have been already facing multiple pressure of oil & gas resource inferior、development of quality & benefit and long-term downturn of oil price, furthermore this tendency will be the new normal. Especially China's future oil and gas production and stable yield will rely more on low permeability ang low-grage oil ＆ gas resources, it is high cost that this kind of reservoir is normally stimulated by using conventional fracturing, acidizing, however the effect becomes worse and worse, also it can cause formation secondary pollution and environmental pollution..This project is devoted to the study of key technology of a simple and practical, low cost controllable high-energy repetition pulse strong shock waves，and through the self-research indoor physical experiment device and different mathematical model of calculation and analysis are established, not only the strong shock wave range and increased permeation mechanism in low permeability core will be determined and veryfied（physical and numerical results verify the correction each other）, but also the influence of of strong shock wave on casing and cement loop are also researched through physical model test and oilfield logging, its adaptability to different types of reservoir is conformed through analysis of the increasement of production and injection effect before and after the application of this technology in the injection and production wells, and to further improve the equipment, tools and the application process (including well and layer selection and well-operation design specification etc.), the applicable & controllable repetition pulse strong shock wave method and technology is finally formed to be the supporting proprietary technology, also a new way and an original method for low permeability reservoir development with low cost will be provided and available.

我国大多数油田勘探开发已经面临资源劣质化、质量效益发展与油价将长期低迷等多重压力新常态。特别是我国未来油气产量稳产增产将更多依靠低渗低品位油气资源，该类储层采用常规压裂、酸化改造成本较高，效果愈来愈差，还会造成地层二次污染和环境污染。本项目拟致力于：①研究出简单实用、低成本、高聚能可控强冲击波产生关键技术方法；②通过自研室内物模实验装置，进行低渗岩心强冲击波作用机理系列实验，建立不同分析计算数学模型（物模与数模结果验证校正），确定强冲击波区域解堵机理和作用范围；③通过物模试验和现场测井研究冲击波对套管和水泥环的影响；④通过分析不同类型油水井应用该技术前后增产增注效果，分析技术的适应性，进一步完善设备工具性能和选井选层条件及施工设计规范等现场应用工艺，形成适用性强的可控高聚能强冲击波解堵专有配套技术方法，为低渗储层低成本开发提供一种原创方法和新技术途径。

本项目针对低渗透储层条件，进行“可控高聚能强冲击波技术、增产增注机理及施工方法研究”是脉冲功率技术在石油领域应用的一项全新原创技术，项目主要研究内容和创新点包括：研制出大型室内物理模拟试验装置，建立了试验测试研究方案；通过理论分析和物模试验确定了强冲击波解堵增渗机理、有效作用距离和对岩心物性参数和力学参数的影响规律；试验表明冲击波不会造成井壁损伤，也不会破坏水泥环及引起串槽现象；确定了该技术用于增产增注选井选层条件、施工设计要求，提高了改造储层的针对性；现场优选推广试验2口井，见到初步效果。本项目通过不断优化冲击波设备施工参数，完善现场施工工艺，实现了技术特点与油藏地质一体化，提高了技术的适应性和针对性，为实现低渗储层低成本改造开发提供一种原创方法和新技术途径，形成理论和认识对该技术在煤层气、页岩气及致密油气资源应用推广有一定借鉴意义。