松辽盆地古龙页岩油水平井试采分析及产能预测

Production test analysis and productivity prediction of horizontal wells in Gulong shale oil reservoirs,Songliao Basin

古龙页岩油资源丰富、甜点规模大,平面上集中分布在松辽盆地北部齐家—古龙地区,勘探发现井A-1水平井压裂后获得日产油量28.6 m^3的高产试采效果,充分展现了古龙页岩油开发潜力。为了搞清古龙页岩油产能水平和产量变化规律,根据页岩储层基质—人工裂缝分阶段渗流特点,应用现代生产动态分析方法,通过3口水平井试油试采资料理论计算与拟合分析,获得开发前期渗流边界范围,为计算动态缝控储量及预测长期开采产量递减提供了依据。结果表明,古龙页岩油水平井体积压裂后适合控制压差生产,具有较稳定初产量和较低初期递减率,预测产量递减曲线与实际试采曲线相符合。

Gulong shale oil is characterized by rich reserves,large-scale sweet spot and centralized planar distribution in Qijia-Gulong area of Songliao Basin.Based on the exploration findings,the high oil-test production of 28.6 m^3/d of Well A-1 after fracturing has fully revealed the development potential of Gulong shale oil.In order to make clear of the productivity level and production change rules,with the help of the seepage characteristics of the reservoir matrix-artificial fracture and the modern production dynamic analysis,through the theoretical calculation and fitting analysis of oil test and production test of three horizontal wells,the seepage boundary scope in the early development stage was then obtained,which has provided the evidences for calculating the dynamic fracture-controlled reserves and predicting the long-term production decline.The results show that the production pressure difference control method is well suited for the volume fractured horizontal wells in Gulong shale oil reservoirs,the wells are characterized by much more stable initial production and pretty lower initial decline rate,and the predicted production decline curves are coincident with those of the actual test production.