摘要
随着当前煤层气开发工作的不断深入,煤层气井控压生产制度得到广泛认可,有效降低了储层应力敏感效应,提高了生产井的估计最终可采储量(EUR)。但是控压生产时,气井工作制度频繁变化导致气量剧烈波动,为准确预测单井EUR带来新的挑战。为揭示煤层气井产量递减规律、解决EUR预测时的不确定性问题,以实际生产数据为例,采用PEworks软件预测和经验式递减模型进行EUR计算。结果表明:PEworks软件预测方法,简便高效,但是不同递减阶段进行预测,预测结果不同,增加了EUR预测的不确定性;经验式递减模型分别利用Arps双曲递减模型和泛指数递减模型进行计算,分别确认泛指数n=0.5、m=0.5时,两种递减模型均获得最佳线性关系。
With the deepening of the current coalbed methane development work,the pressure control production system of coalbed methane wells has been widely recognized,which effectively reduces the reservoir stress sensitivity effect and improves the EUR of production wells.However,during pressurecontrolled production,frequent changes in the working system of gas wells lead to violent fluctuations in gas volume,which brings new challenges to accurately predict the EUR of single wells.In order to reveal the production decline law of coalbed methane wells and solve the uncertainty problem in EUR prediction,taking the actual production data as an example,PEworks software prediction and empirical decline model are used to calculate EUR.The results show that the prediction method of PEworks software is simple and efficient,but the prediction results are different in different decreasing stages,which increases the uncertainty of EUR prediction.The empirical decline model is calculated by Arps hyperbolic decline model and pan-exponential decline model respectively.It is confirmed that when the pan-exponential n=0.5 and m=0.5,the two decline models obtain the best linear relationship.
作者
张群霞
毛崇昊
刘展
雷兴龙
陈翔羽
ZHANG Qunxia;MAO Chonghao;LIU Zhan;LEI Xinglong;CHEN Xiangyu(CBM Branch Company,PetroChina Huabei Oilfield Company,Shanxi 046000)
出处
《中国煤层气》
2025年第2期37-41,共5页
China Coalbed Methane
