水平井试井曲线线性流段影响因素研究
Study on influencing factors of linear flow section in horizontal well test curve
邓琪 1张宏友 1刘杰 1雷源 1付蓉1
作者信息
- 1. 中海石油(中国)有限公司天津分公司,天津 300459
- 折叠
摘要
针对渤海油田水平井试井曲线多解性强,部分井水平段线性流不明显等问题,利用水平井试井模型,分析了水平段位于储层中部、顶部及斜穿储层三种布井方式下的试井曲线变化规律,得出重点研究对象为水平段位于储层中部与顶部两种情况.在此基础上分析了不同井储系数、表皮系数、厚度、渗透率以及垂直渗透率与水平渗透率比值(Kv/Kh)对水平段线性流出现时间与持续时间的影响规律,总结了实际曲线中的"假线性流"与"短线性流"出现原因.研究表明井储系数小于1 m3/MPa时,随着井储系数增加,相同布井方式下,线性流出现时间差异不大,但不同布井方式之间存在差异;当水平段位于储层顶部时,线性流出现时间滞后0.8～1个对数周期;当厚度大于20 m,且水平段位于储层顶部时,试井曲线在早期出现受顶部边界效应引起的"假线性流",持续时间在1～5 h.实例应用结果对于正确认识水平井试井曲线具有重要意义,可以用来指导渤海油田水平井试井施工设计与结果解释.
Abstract
In response to the strong ambiguity of well testing curves for horizontal wells in the Bohai Oilfield,and the lack of distinct linear flow in the horizontal sections of some wells,a horizontal well testing model was utilized to analyze the changes in well testing curves under three well placement scenarios:the horizontal section located in the middle of the reservoir,at the top of the reservoir,and diagonally traversing the reservoir.The key research objects were identified as two situations where the horizontal section is situated in the middle and top of the reservoir.On this basis,the impact of different well storage coefficients,skin factors,thickness,permeability,and the ratio of vertical permeability to horizontal permeability(Kv/Kh)on the timing and duration of linear flow in the horizontal section was analyzed.The reasons for"pseudo-linear flow"and"short linear flow"in actual curves were summarized.The study results indicate that when the well storage coefficient is less than 1 m3/MPa,as the well storage coefficient increases,there is little difference in the occurrence time of linear flow under the same well placement,but there are differences between different well placement methods.When the horizontal section is located at the top of the reservoir,the onset of linear flow is delayed by 0.8 to 1 logarithmic cycle.When the thickness is greater than 20 m and the horizontal well is positioned at the top of the reservoir,the test curve exhibits"pseudo-linear flow"caused by the top boundary effect during the early period,and the duration is 1 to 5 hours.The results of practical applications are of great significance for correctly understanding the test curves of horizontal wells,which can be used to guide the design and interpretation of horizontal well tests in the Bohai Oilfield.
关键词
水平井/试井/水平段线性流/布井方式/渤海油田Key words
horizontal well/well testing/linear flow in horizontal section/well placement method/Bohai Oilfield引用本文复制引用
出版年
2024
NETL
NSTL
万方数据