苏里格气田致密气开发井网效果评价与调整对策  

Effect evaluation and adjustment countermeasures of tight gas development well patterns in the Sulige Gas Field

作　　者：王国亭[1] 贾爱林[1] 郭智[1] 孟德伟[1] 冀光[1] WANG Guoting;JIA Ailin;GUO Zhi;MENG Dewei;JI Guang(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]中国石油勘探开发研究院

出　　处：《天然气工业》2023年第8期66-79,共14页Natural Gas Industry

基　　金：中国石油“十四五”前瞻性、基础性科技专项“致密气勘探开发技术研究”(编号:2021DJ2106)、“复杂天然气田开发关键技术研究”(编号:2021DJ1704)。

摘　　要：鄂尔多斯盆地致密气资源丰富,其天然气资源量占全国致密气总资源量的60%以上,已发现苏里格、神木、大牛地、延安、米脂等多个致密气田。其中苏里格气田引领中国致密气开发已20年,由于气田开发井网复杂多样,其结构特征与开发效果缺乏系统评价,因此未来天然气井网优化调整对策尚不明确。为此,充分利用区内1.8×104余口气井的动、静态生产资料,系统梳理了开发进程中井网的持续优化过程,将其划分为直井规则、混合、水平井整体、加密试验与欠完善等5种类型,并采用加密井增产气量评价方法,评价了不同井网的特征和开发效果,提出了高效调整对策。研究结果表明:(1)500 m×650 m、600 m×600 m井网下,天然气的采收率较高,但优化调整面临较大风险;(2)600 m×800 m井网较优,既可达到较高的天然气采收率,又具备优化调整空间;(3)混合开发井网占比高,但储量碎片化严重,优化调整潜力有限;(4)水平井整体井网的优化调整可能性较低。结论认为,针对成熟天然气开发区需加强剩余气精细挖潜与井网精准调整技术攻关,针对未开发区应强化储层结构精准描述与可视化部署、差异化井网实施与储量极致动用技术研究,从而为气田长期稳产及提高天然气采收率提供支撑,也为我国致密气藏高效开发提供技术参考。The Ordos Basin is rich in tight gas resources,which accounts for over 60% of national tight gas resources.Several tight gas fields have been discovered in this basin,including Sulige,Shenmu,Daniudi,Yan'an and Mizhi.The Sulige gas field has been leading tight gas development in China for 20 years,but the development well patterns are complex and diverse,and their structural characteristics and development effect lack systematic evaluation,so the future optimization and adjustment countermeasures of natural gas well patterns are not determined yet.Based on the static and dynamic data of more than 18000 gas wells,this paper systematically analyzes the continuous optimization process of the well patterns in the development process,and classifies the well patterns into five types:regular vertical well pattern,mixed well pattern,overall horizontal well pattern,infilled testing well pattern,and imperfect well pattern.In addition,the characteristics and development effects of different well patterns are evaluated by using the infill well production increment evaluation method,and the adjustment countermeasures are proposed.The following research results are obtained.First,500 m×650 m and 600 m×600 m well patterns can realize higher natural gas recovery,but face significant optimization and adjustment risks.Second,600 m×800 m well pattern is better with higher natural gas recovery and larger optimization and adjustment space.Third,mixed well pattern accounts for high proportion,but has serious reserve fragmentation and limited optimization and adjustment potential.Fourth,the overall horizontal well pattern has lower possibility in optimization and adjustment.In conclusion,as for the mature natural gas development areas,it is necessary to strengthen the technological research of fine remaining gas potential tapping and fine well pattern adjustment,and as for the undeveloped areas,it is necessary to strengthen the technological research of fine reservoir structure description and visual deployment,differential well patt

关 键 词：苏里格气田 致密气藏 井网特征 混合井网 开发效果 提高采收率 剩余气挖潜 差异化部署 

分 类 号：TE324[石油与天然气工程—油气田开发工程]