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 addition,the coalbed methane production breakthrough has been achieved in all types of reservoirs in Qinshui Basin,with an annual production capacity of 21×10^(8) m^(3) in coalbed methane field in the southern Qinshui Basin,which is it the largest coalbed methane field in China,greatly boosting the strategic development of coalbed methane.
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
