缝洞型油藏高压扩容注入动态模型及敏感性分析
Dynamic Model and Sensitivity Analysis of High-Pressure Water Injection for Capacity Expansion of Fractured-Vuggy Reservoirs
张如杰 1陈利新 2乐平 3肖云 2王霞 2吕远 4杨文明5
作者信息
- 1. 西南石油大学 油气藏地质及开发工程全国重点实验室,成都 610500;中国石油 塔里木油田分公司 东河采油气管理区,新疆 库尔勒 841000
- 2. 中国石油 塔里木油田分公司 东河采油气管理区,新疆 库尔勒 841000
- 3. 西南石油大学 油气藏地质及开发工程全国重点实验室,成都 610500
- 4. 西南石油大学 油气藏地质及开发工程全国重点实验室,成都 610500;陕西延长石油(集团)有限责任公司 研究院,西安 710075
- 5. 中国石油 塔里木油田分公司 轮南采油气管理区,新疆 库尔勒 841000
- 折叠
摘要
高压扩容注水是缝洞型油藏提高采收率的有效方式之一.针对高压扩容注水注采过程认识不清的问题,提出了3类高压扩容注水模式,基于高压扩容注入动态模型,模拟不同敏感性参数对高压扩容注水和生产过程的影响,并结合哈拉哈塘缝洞型油藏矿场实例,分析了3类高压扩容注水模式.结果表明:高压扩容注水有远端低能型、渗流屏障型和近端小储集体型3类模式,3类高压扩容注水模式均可有效动用远端储集体,提高采出程度,渗流屏障型增油效果最优;近端储集体大小影响注水指示曲线拐点出现时间,远端储集体大小影响注水指示曲线出现拐点后的注水难易程度;注水过程的交换指数大于生产过程的交换指数,表明高压扩容注水有效;裂缝闭合压力越小,应力敏感系数越小,注水指示曲线出现拐点越早,累计产液量越高.
Abstract
High-pressure water injection for capacity expansion is an effective method to enhance the recovery of fractured-vuggy reser-voirs.However,the injection-production process during high-pressure water injection remains unclear.In this paper,three modes of high-pressure water injection for capacity expansion were proposed.Based on a dynamic model of high-pressure water injection for capacity ex-pansion,the impacts of sensitivity parameters on the injection-production process during high-pressure water injection were simulated.The three modes of high-pressure water injection for capacity expansion were analyzed using actual wells drilled in the fractured-vuggy reser-voirs in Halahatang oilfield.The high-pressure water injection for capacity expansion conforms to three modes:far-end low-energy,flow bar-rier,and near-end small reservoir.All three modes can realize effective production of far-end reservoirs to improve recovery efficiency.Flow barrier mode has the optimal EOR effect.The size of the near-end reservoir affects the time at which the water-injection indicator curve inflects,and the size of the far-end reservoir influences the difficulty degree of water injection after the water-injection indicator curve inflects.The fluid exchange index in the water injection process is greater than that in the production process,which indicates that the high-pressure water injection for capacity expansion is effective.The smaller the fracture closure pressure and stress sensitivity coeffi-cient,the earlier the water-injection indicator curve inflects,and the higher the cumulative liquid production.
关键词
哈拉哈塘油田/缝洞型油藏/高压扩容注水/注采动态/注水模式/敏感性/流体交换指数Key words
Halahatang oilfield/fractured-vuggy reservoir/high-pressure water injection for capacity expansion/injection-production perfor-mance/water injection mode/sensitivity/fluid exchange index引用本文复制引用
基金项目
四川省科技厅区域创新合作项目(20QYCX0028)
中国石油前瞻性基础性技术攻关项目(2021DJ3301)
出版年
2024
NETL
NSTL
万方数据