摘要
我国高煤阶煤层气资源丰富,其高效开发利用的能源、安全、生态意义十分突出。以沁水盆地南部高煤阶煤层气开发实践为例,系统分析了早期开发过程中面临的5个主要问题及挑战:高煤阶煤层气开发理论不完善;有利区选择精度低;储层改造技术适应性不强;排采控制制度效率低、效益差;集输系统呈现“三难”“三高”。中国石油华北油田公司坚持问题导向、目标引领,室内研究与现场实践相结合,形成了高煤阶煤层气高效开发的新理念及关键技术对策:提出高煤阶煤层气疏导开发理念,构建套管单支水平井+分段压裂的煤层气开发方式;建立高产有利区优选技术,实现建产模式由大面积整体建设向精准建产选区转变;完善升级煤层气压裂改造技术,实现储层改造向构建多级有效缝网转变;创新疏导排采控制技术,实现排采控制向优快高效转变;建立低压环状地面集输技术,实现地面集输建设模式向高效益转变。经实践,平均新建产能到位率由37%提升至84%以上,平均单井日产气提高为原来的1.6倍,达产时间缩短20%以上,新建项目地面建设投资降低20%。沁水盆地不同储层类型煤层气开发均取得产量突破,沁水盆地南部煤层气田年生产能力突破21×10^(8)m^(3),建成我国最大的煤层气田,有力助推了我国煤层气的战略性发展。
There are abundant high-rank coalbed methane resources in China,and the high-efficiency development is of great energy,security,and ecological significances.Taking the development practice of high-rank coalbed methane in southern Qinshui Basin as an example,five main problems and challenges in the early development process are systematically analyzed:(1)A lack of advanced theory for the development of high-rank coalbed methane;(2)Low accuracy of favorable area selection;(3)Insufficient adaptability of reservoir reconstruction technology;(4)Low efficiency and poor benefit of drainage-production control regime;(5)“Three difficulties”and“three highs”of the gathering and transportation system.PetroChina Huabei Oilfield Company has adhered to problem-oriented and target-oriented approach and integrated indoor research and field practice,forming a new concept and key technologies for the high-efficiency development of high-rank coalbed methane,which include a drainage development concept,and a development mode of single-lateral horizontal well casing+multistage fracturing;The technology for optimal selection of high-yield favorable areas has been researched,achieving the transformation from large-area overall production capacity construction to precise construction mode in the favorable area;The fracturing and reservoir stimulation technology for coalbed methane has been improved and updated,which supports to form multi-level effective fracture network;The optimal,fast and high-efficiency drainage-production control technology has been innovated;The low-pressure ring surface gathering and transportation technology has been developed to achieve high benefits.The field practice shows that the success rate of new constructed production capacity has increased from 37%to higher than 84%,the average daily gas production of a single well has increased by 1.6 times,the time reaching target production has decreased by more than 20%,and the cost of surface construction investment for new projects has reduced by 20%.In ad
作者
杨延辉
王玉婷
刘忠
陈必武
吴春升
张学英
董晴
Yang Yanhui;Wang Yuting;Liu Zhong;Chen Biwu;Wu Chunsheng;Zhang Xueying;Dong Qing(PetroChina Huabei Oilfield Company;CNPC Coalbed Methane Production Pilot Test Base;Research Institute of Exploration&Development,PetroChina Huabei Oilfield Company;China University of Geosciences(Wuhan);Shanxi Coalbed Methane Exploration and Development Branch,PetroChina Huabei Oilfield Company)
出处
《中国石油勘探》
CAS
CSCD
北大核心
2024年第4期17-30,共14页
China Petroleum Exploration
基金
国家科技重大专项“沁水盆地高煤阶煤层气高效开发示范工程”(2017ZX05064)
中国石油天然气股份有限公司前瞻性、基础性技术攻关项目“深层煤层气富集成藏与高产基础理论研究”(2021DJ2301)。
关键词
沁水盆地
高煤阶煤层气
高效开发
疏导开发理念
精准建产区优选
压裂改造
排采控制
低压环状集输
Qinshui Basin
high-rank coalbed methane
high-efficiency development
drainage development concept
optimal selection of capacity construction area
fracturing reconstruction
drainage-production control
low-pressure ring gathering and transportation
