延北113—133致密气藏水平井速度管柱安装策略研究

Study on velocity string installation strategy of horizontal well in Yanbei 113—133 tight gas reservoir

针对延北113—133气藏水平井积液后,如何利用速度管柱提高排水采气效率,同时较大程度恢复产能的问题,在综合考虑储层条件、井筒状况、生产动态的基础上,利用数值模拟方法开展了不同储层类型的井及速度管柱安装的合理尺寸及时机研究。研究成果表明1)速度管柱的安装时机影响气井的阶段累计产出,不影响最终的累计产出;速度管柱的安装尺寸既影响阶段累计产出也影响最终的累计产出。2)对于Ⅰ类和Ⅱ类储层的井,应该在采出程度约大于33%的时候安装速度管柱;对于Ⅲ类储层的井,采出程度约大于19%的时候安装速度管柱。3)速度管柱的安装尺寸应随着储层物性的变好而增大,Ⅰ类和Ⅱ类储层的井应安装较大尺寸速度管柱,Ⅲ类储层的井应安装较小尺寸的速度管柱。该研究形成的与储层条件适应的速度管柱安装策略,对延北气藏的高效开发具有一定的指导意义。

A velocity string installation strategy considering geology conditions,wellbore statement,production status was used to tailor velocity string installment plans in horizontal wells in Yanbei 113—133 block with excellent results.This strategy is focused on forming standards for velocity string installation in terms of the result of numeric simulation,which provides guidance to the optimal time and size of velocity string installation under the current status of the existing wells to increase efficiency of water withdrawal and maximize the release of wells’productivity.The research reveals show that:1)The installation time of the velocity string affects the cumulative output of the gas well,but not the final cumulative output.The installation size of the velocity string affects both the cumulative output of the stage and the final cumulative output.2)For class I and class II wells,the velocity string should be installed at approximately 33%recovery;For classⅢwells,install the velocity string at approximately 19%recovery.3)The installation size of the velocity string should increase with the improvement of reservoir physical properties.classⅠand classⅡwells should be installed with larger size velocity string,and classⅢwells should be installed with smaller size velocity string.The velocity pipe string installation strategy adapted to the reservoir conditions is of guiding significance to the efficient development of Yanbei gas reservoir.