摘要
鄂尔多斯盆地致密油藏的开发还处于试验阶段,由于储集层致密,启动压力梯度高,常规注水开发压力传递慢,有效驱替系统难以建立,加之存在裂缝等优势渗流通道,整体表现出注水不见效,见效即见水的水驱矛盾。应用水驱前缘和示踪剂监测资料,研究了致密油藏开发过程中的见水特征及原因。改变了以往只在油井压裂开发的经验,优选了一个注水井组,进行注水井体积压裂试验,观察人工压裂后的生产变化。An83区长7致密油藏,油井为多方向见水,原因是早期地质运行过程中形成的多期裂缝相互叠加,注水井经过体积压裂后,人工裂缝取代天然裂缝成为主要渗流通道,改变了水驱方向,水驱效果得到改善,对油田调整挖潜有重要的指导作用。
The development of tight oil reservoir in the Ordos Basin is still in the experimental stage.Due to the tight reservoir and higher starting pressure gradient,effective flooding system is difficult to establish and pressure transmission is slow under conventional water injection development.Coupled with the existence of cracks and other advantages flowing channel,the contradiction of water injection is not effective or effective is also water flooding.Water flooding front and tracer monitoring data are used to study the characteristics and reasons of the development of tight oil reservoir.Volume fracturing test on injection well was carried out in a group of wells,the influence of artificial crack on the development effect is observed,the method changes the previous experience of oil well fracturing.The water flooding of oil well come from multiple directions at An83 Chang 7 tight reservoir,the reason is that multi period fractures formed in the early geological process is superimposed on each other.Artificial fractures replace natural fractures as the main flow channel after volume fracturing,the direction of water drive is changed,and water flooding effect is improved.This has an important guiding role to oil adjustment.
出处
《科学技术与工程》
北大核心
2017年第30期161-166,共6页
Science Technology and Engineering
基金
国家科技重大专项(2011ZX05044)资助
关键词
致密油
注水井
人工裂缝
压裂
tight oil injection well artificial fracture hydraulic fracturing
