涪陵页岩气田分段压裂水平井非稳态产能评价方法-《油气井测试》

文章信息/Info

Title:: Unsteady productivity evaluation of horizontal wells with staged fracturing in Fuling shale gas field

Author(s):: ZHENG Aiwei; LI Jiqing; LU Wentao; LIANG Bang; ZHANG Qian; YANG Wenxin; Exploration and Development Research Institute, Sinopec Jianghan Oilfield Company, Wuhan, Hubei 430010, China

Keywords:: ;
production capacity coefficient; unsteady stage; matrix linear flow; productivity evaluation; horizontal well with staged fracturing; Fuling shale gas field

摘要:: 为了摸清页岩气井生产动态特征，明确气井真实产能，对页岩气分段压裂水平井产能评价方法进行研究。基于基质线性流理论，推导出页岩气分段压裂水平井非稳态线性流产能方程，建立了在直角坐标系中页岩气分段压裂水平井非稳态产能评价图版，提出了页岩气井产能系数。经涪陵页岩气田现场生产数据验证，涪陵气田页岩气分段压裂水平井长期处于非稳态线性流阶段，单井产能系数与生产压力保持水平呈良好正相关关系，与非常规产量预测软件预测可采储量呈良好的正相关线性关系。结果表明，页岩气井产能系数是评价页岩气分段压裂水平井处于非稳态条件下生产能力的有效指标，通过求取页岩气井产能系数可以预测可采储量。建议对页岩气分段压裂水平井连续监测井底流压3-6个月，获取可靠的页岩气井产能系数后对产能进行评价。

Abstract:: In order to analyze the production performance of shale gas well and realize the real productivity of gas well, a productivity evaluation method of horizontal wells with staged fracturing for shale gas was studied. The unsteady productivity equation was derived and evaluation charts for horizontal wells with staged fracturing for shale gas development were constructed in the rectangular coordinate system according to the matrix linear flow theory, the production capacity coefficient of shale gas wells was determined. Production data of the Fuling Shale Gas Field show that the production capacity coefficient is positively correlated to the production pressure level in shale gas wells. Moreover, a positive linear relationship can be observed between the production capacity coefficient of shale gas wells and the technically recoverable reserves predicted by using the conventional production forecasting software. The research results show that the production capacity coefficient of shale gas well is an effective index for assessing the production capacity of horizontal well with staged fracturing for shale gas development under unsteady conditions, the recoverable reserves can be forecasted in accordance with the production capacity coefficient of shale gas wells. Bottom-hole flowing pressure was continuously monitored for 3-6 months to obtain reliable production capacity coefficients of horizontal wells with staged fracturing for productivity evaluation.