摘要
以鄂尔多斯盆地东缘三区块煤层气为例，按照开发前期井网设计、现场优化部署和动态效果跟踪3个阶段一体化的整体思路和方法，对煤层气开发井网进行优化部署和动态调整。开发前期井网设计以煤层构造、埋深、厚度、顶底板岩性、含气量、渗透率和水文地质条件等7个方面的地质条件为依据，确定开采井网应为菱形井网，井型以丛式井为主，水平井为辅；井网方位是菱形长对角线为面割理方向，短对角线为端割理方向；高渗透区井距为300～350m，低渗透区井距为350-400m。现场优化部署要充分考虑地表、地下和钻井工程条件3个因素，并遵循地上服从地下、工程服从地质的基本要求。动态效果跟踪阶段，通过对区内井间干扰和层间干扰现象的观察，重新优化部署24口生产井，调整36口生产井的开发层系，使得区块井网设计更为合理。5a的开发实践证明，三区块优化部署后的井网和开发模式基本合理。
Based on the coalbed methane development of block III in the eastern edge of the Ordos Basin, the well pattern was optimized and dynamically adjusted, according to a system engineering including three stages： well pattern pre-development design stage, well site optimization stage and dynamic tracking stage. The geological basis for well deployment of coalbed methane was proposed and the parameters of well pattern design were optimized during the well pattern pre-development design stage. The geological conditions have been explored from several aspects which include coal bed structure, buried depth, coal seam thickness, roof and floor lithology, gas content, permeability and hydrological condition. The favorable production well pattern was the rhombus pattern. The cluster well was chosen as the main well type and then horizontal well. For the local anisotropy coal seam, rhombus long diagonal was in the direction of face cleats and short diagonal was in the direction of butt cleats. The well spacing was 300-350 m in high permeability zones and 350-400 m in low permeability zones. It is necessary to consider those factors, such as surface, subsurface and drilling conditions, to optimize the well locations during the well site optimization stage and to follow the basic requirements of ＂surface following subsurface, engineering following geology＂. After having observed the well interference and interlayer interference phenomenon during the dynamic tracking stage, twenty-four production wells have been relocated and the producing layers for thirty-six production wells have been changed. Then the well pattern design was more reasonable in this block. It is confirmed that the posterior well pattern design and development mode are more reasonable after the optimal deployment in the block III during this five years.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2016年第1期84-90,共7页
Petroleum Exploration and Development
基金
国家科技重大专项"煤层气储层工程及动态评价技术"(2011ZX05034)
关键词
煤层气开发
井网设计
井网优化部署
生产动态跟踪
井位调整
开发层系调整
coal-bed methane development
well pattern design
well pattern optimal deployment
production dynamic tracking
well relocation
producing layer adjustment
