论文部分内容阅读
受多因素影响,煤层气井的排采动态具有复杂多变的特点,对煤层气井的排采动态进行诊断,有助于煤层气开发井层优选和压裂方案制定。以均匀分布在柿庄区块的单采3号煤层的30口煤层气井的静态地质资料和排采动态资料为基础,通过单井典型日产水量和典型日产气量指标提取和气水产出关系分析,从井筒和压裂煤层系统封闭性的角度,讨论高产水的外源成因,进而提出单井排采动态层次诊断方法,并通过实例分析进行验证。研究表明,柿庄区块煤层气井产气与产水之间存在负向包络而非简单的相关关系,高产水对产气有明显的抑制作用;断裂和压裂缝沟通含水层是造成柿庄区块部分煤层气井高产水及井间排采动态差异的重要原因;“一看断裂,二看压裂缝类型,三看岩性组合”的单井排采动态层次诊断方法,在柿庄区块单井实例分析中得到验证,该方法具有一定的普适性,可推广应用到其他煤层气区块的单井排采动态诊断分析中。
Affected by many factors, the dynamic of discharge of coalbed methane wells is complex and changeable. It is helpful to diagnose the discharge of coalbed methane wells, which is helpful for the optimization of CBM development wells and the development of fracturing schemes. Based on the static geological data and the dynamic discharge data of 30 CBM wells distributed evenly in the Shimu No.3 coal seam in the Shizhuang block, this paper analyzes the relationship between the typical daily production of single well and the daily output of typical gas and the relationship between gas and water production, The wellbore and fractured coal seams, the exogenous genesis of high-yielding water is discussed, and then the dynamic level diagnosis method of single-well discharge is put forward and verified by case analysis. The study shows that there is a negative correlation between gas production and water production in the coal gas wells in the Shizhuang block rather than a simple correlation. High-yielding water obviously inhibits gas production. Fractures and fractures communicate with aquifers, Some important reasons for the dynamic differences of CBM well water production and cross-well discharge in the block are as follows: 1) The dynamic level diagnosis method of single well discharge for “see a fracture type, see a type of fracture pressure and see a lithologic combination” The block single well case analysis has been verified, and the method has certain universality and can be popularized and applied to dynamic analysis of single well in other coalbed methane blocks.