摘要
密闭取心在油田的注水开发中，是取得准确的含油水饱和度的一种方法，由于长期注水开发，目前地层孔隙压力发生了很大的变化，油层含水高，密闭取心指标很低，而且在高孔渗地层，密闭率也无法保证。本文根据多年的密闭取心经验，分析了9口井的资料，提出了在高孔渗、高含水、低孔隙压力地层中先期污染是影响密闭率的重要因素。并建议研究低污染钻头，以及选择新的示踪剂或改进化验方法提高资料的准确度。
The technology of closed-coring is one of the methods that can get correct oil-water saturation in the development with Waterflooding. Formatim pressure has been changing and water cut increasing with long-term water flooding. These are reasons why the closed-coring efficiency are affected at present, especially in high-permeability formations. This paper presents a important factor which affects closed-coring in the high-permeability and high water cut as well as low pressure formations,to be called 'initial pollution'. The authors suggest that antipollution bits should be manufactured and new tracers choosed. At same time,inspection methods should also be improved to increase the accuracy of materials.
出处
《断块油气田》
CAS
1995年第2期47-50,共4页
Fault-Block Oil & Gas Field
关键词
密闭取心
密闭率
渗透率
先期污染
后期污染
Closed-coring,Sealed efficiency, Permeability, Initial pollution,Final pollution
