爆燃压裂油井产能热稳态数值模拟评价

根据温度场和渗流压力场的相似原理,利用ANSYS热稳态数值模拟模型,分析了爆燃裂缝参数对油藏渗流压力场和油井产能的影响,并与爆燃压裂油井产能数学模型的计算结果进行了对比。结果表明,爆燃裂缝的存在,使靠近裂缝处流体的渗流方式由径向流变为线性单向流,且爆燃裂缝渗透率高,提高了地层流体在油藏中的渗流能力和油井产能;爆燃裂缝前端等温线发生明显弯曲和集中,证明裂缝前端存在汇流现象;保角变换产能数学模型和节点系统分析产能数学模型的计算结果与ANSYS热稳态数值模拟结果的平均相对误差分别为6.13%和7.6%,验证了保角变换产能数学模型和节点系统分析产能数学模型具有较高的精度和工程适用性,可为爆燃裂缝参数设计提供依据。

Evaluation of exploding fracture wells productivity using thermal stable numerical simulation

The influence to reservoir fluid flow pressure field and well productivity of exploding fracture parameters are numerical simulated and analyzed using ANSYS thermal stable state numerical simulation model,and productivity comparative analysis be-tween numerical simulation value and productivity equation result is conducted based on the similarity between temperature field and fluid flow pressure field in porous media.Research results indicate that;exploding fractures improve fluid flow capability inreservoir and raise wells productivity by altering flow pattern form radial flow to linear flow and causing high permeability in the exploding fracture;Flow convergence in the fracture front edge is proved by obvious isothermal contour bent and centralization;the average relative productivity error between nodal system analysis result and imitation result is 7.6% while 6.13% between confor-mal transformation result and imitation result by comparative analysis between productivity equation model result and ANSYS ther-mal stable state analysis model result,this proves good accuracy and engineering suitability of conformal transformation productivity model and nodal system productivity model.The researches can provide foundation for exploding fractures parameter design.