大庆徐深气田致密气藏间歇开井增产机理-《油气井测试》

文章信息/Info

Title:: Production stimulation mechanism of intermittent well opening in tight gas reservoirs in Daqing Xushen gas field

Author(s):: FAN Xuejun; Oil and Production Testing Branch, PetroChina Daqing Oil Field Co. Ltd., Daqing, Heilongjiang 163412, China

Keywords:: Xushen gas field; tight gas reservoir; reservoir classification; intermittent well opening; gas testing; productivity; core experiment

摘要:: 大庆致密气藏储层物性差，自然测试产能较低，采用大规模多段压裂以实现储量动用和提高单井产能的方法，难以确定本类储层增产原因。对徐家围子致密气区块气藏岩心的微观渗吸置换室内实验进行研究，优化出3种类型储层：Ⅰ类储层渗吸效果好，产能增加明显；Ⅱ类储层渗吸效果一般，产能增加不多；Ⅲ类储层几乎无渗吸，产能无增加；根据储层类别，确定间歇开井时机、优化及完善求产技术。经对Ⅰ类储层Y9井进行间歇开井增产实验，关井16 d渗吸置换，重新开井测气，产量增加83%。该研究结果提高了对徐家围子区域总体认识，指导了区域间歇开井后试气求产，为求产工艺提供了技术指导。

Abstract:: The physical properties of Daqing tight gas reservoirs are poor, and its productivity of natural testing is low. Largescale 〖JP3〗multistage fracturing can be used to enhance reserve utilization and increase singlewell productivity, but it is difficult to determine the reasons for the increase in production of the fractured reservoir. Through laboratory experiments of microscopic imbibition and displacement on cores from tight gas reservoirs in Xujiaweizi block, three types of reservoirs are optimized: Type I reservoirs have a good imbibition effect with an obvious productivity increasement; Type II reservoirs have a general imbibition effect, and the productivity increasement 〖JP2〗is not that much; Type III reservoirs have almost no imbibition and no productivity increasement. According to the reservoir classification, determine the timing for intermittent well opening, optimize and perfect the production calculation technology. After performing a stimulation experiment with intermittent well opening for Well Y9 in type I reservoir, reopen the well for gas testing after imbibition and replacement during shutin for 16 days well, the production increased by 83%. The study improves overall understanding of the Xujiaweizi region, can guide production calculation with gas testing after regional intermittent well opening, and can provide technical guidance for the production calculation process.

备注/Memo:: 2020-01-17收稿，2020-08-25修回,2020-09-01接受,2020-10-20网络版发表
中国石油天然气股份有限公司“十三五”重大科技项目“松北深层天然气富集规律、勘探技术研究与规模增储”（2016E-0203）
范学君，男，1968年出生，高级工程师，1991年毕业于东北石油大学采油工程专业，现从事试气地质管理及解释评价工作。电话：0459-5693996，13039880501；Email:fanxuejun01@petrochina.com.cn。通信地址：黑龙江省大庆市让胡路区乘南十八街铁人大道大庆油田试油试采分公司地质大队，邮政编码：163412。