考虑裂缝导流能力时效的海上压裂井产能研究

Research on Fracturing Well Productivity of Low Permeability Reservoir at Sea Considering Fracture Conductivity Varying Over Time

裂缝导流能力时效性是影响压裂井产能的重要因素之一。为了研究海上低渗压裂井的产能,在无限大地层压降公式的基础上,运用复势叠加原理,建立了压裂井的产能模型,并且考虑了裂缝导流能力时效性的影响。运用产能模型对海上低渗压裂井的产能进行研究。结果表明,裂缝导流能力时效性对油井生产规律有较大影响,考虑裂缝导流能力时效性后的生产规律更加符合生产实际。影响因素分析结果表明:渗透率越低,裂缝长度对产能的影响越大,而裂缝导流能力对产能的影响越小;渗透率越低、有效厚度越小的储层越需要通过压裂增加泄油面积,提高单井产能,增加海上低渗油藏的经济效益。

Fracture conductivity varying over time is one of the important factors influencing the fracturing well productivity. In order to study the fracturing well productivity of low permeability reservoir at sea, a productivity model of fracturing well was established on the basis of the infinite formation pressure drop formula, using the potential superposition principle and considering fracture conductivity changing over time. Studies on fracturing well productivity were performed using the established model. Results show that fracture conductivity changing over time has great impact on productivity, and fracturing well production law better fits reality using the new model. Finally, productivity impact factors were analyzed. Results show that the lower permeability the greater impact on productivity by fracture length, and the less impact on productivity by fracture conductivity. In lower permeability reservoir with smaller effective thickness at sea, more fracturing is needed to increase drainage area, enhance well productivity and improve economic benefits.