摘要
针对压裂水平井产能预测模型未考虑地层流体直接流入水平井筒问题,研究应用气体不稳定渗流公式和势的叠加原理,把每条裂缝和水平井筒均看成由无数个点汇组成,建立考虑地层流体直接流入水平井筒情况下,裂缝与水平段同时生产时的低渗透气藏水平井分段压裂完井非稳态产能预测模型,讨论不同气藏基质渗透率情况下裂缝参数对压裂水平井产能的影响.实例计算结果表明,在不同基质渗透率下,优化出的水平井分段压裂完井裂缝参数不同,基质渗透率越低,累积产气量越小,需要压开的裂缝越多,缝长与间距的比值越大.所建模型有利于指导物性不同的储层裂缝参数的优化,可为低渗透气藏水平井分段压裂优化设计提供理论依据.
Generally,models for productivity forecast of fractured horizontal gas wells seldom take into account the influx course of formation fluid directly flowing into horizontal a well bore,which results in difference between actual conditions.To remedy this situation,the unsteady gas seepage formula and potential superposition theory are adopted to establish the transient productivity model of multi-stage fractured horizontal well in low permeability gas reservoirs.The proposed model considers that,in the case of formation fluid flowing directly into a horizontal well bore,fractures and horizontal well bore produced together.And the influence of fracture parameters on fractured horizontal gas well productivity under different matrix permeability is also discussed.Case studies show that under the condition of different matrix permeability,fracture parameters optimization is also different;the lower the matrix permeability the smaller the cumulative gas production.The more fractures are needed,the higher the ratio of fracture length to spacing is.The model is beneficial to guiding fracture parameters optimization of different physical property reservoirs and to providing theoretical basis for multi-stage fractured horizontal well optimization design in low permeability gas reservoirs.
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2014年第3期266-272,共7页
Journal of Shenzhen University(Science and Engineering)
基金
"十二五"国家科技重大专项资助项目(2011ZX05022-006-004)~~
关键词
低渗透气藏
水平井
分段压裂
产能预测
非稳态
裂缝参数
low permeability gas reservoir
horizontal well
multi-stage fracturing
productivity forecast
unsteadystate
fracture parameters
