裂缝性致密油藏地质-工程一体化开发

Integrated Geology-Engineering Development Technology for Fractured Tight Oil Reservoirs

以克拉玛依油田克80井区风城组裂缝性致密火成岩油藏为例,为提高单井产能,提出了地质-工程一体化开发技术。在有效识别储集层天然裂缝潜在发育区域的基础上,准确预测区域地应力和三维储集层岩石力学强度,建立区域可压裂性评价方法,优选压裂"甜点",在压裂"甜点"上对目标井位进行产能模拟和压裂方案优化,并最终确定工程方案。钻井结果表明,地质-工程一体化开发有效提高了储集层缝网沟通规模,增大了泄流面积,从而提高了增产效率,单井产量提高显著。同时,可对甜点区域进行二次工程改造,通过增加压裂液液量提高施工规模,进一步提高单井产能。上述应用效果证明了地质-工程一体化开发技术的有效性和推广价值,对裂缝性致密油藏的高效开发具有重要意义。

Taking the fractured tight igneous rock reservoirs of Fengcheng formation in Wellblock Ke-80, Karamay oilfield as a case, inte-grated geology-engineering development technology is proposed to improve well productivity. Based on effective identification of potentialareas for natural fractures in the reservoir, the paper accurately predicts the regional ground stress and strength of 3 D reservoir rock me-chanics, establishes a feasibility evaluation method of regional fracturing and optimizes sweet-spots for fracturing. Based on which produc-tivity modeling and fracturing program optimization are carried out for target well locations and the final engineering program can be deter-mined. The actual drilling results show that the integrated geology-engineering development technology can effectively improve the connect-ing scale of fracture network, enlarge the discharge area and then improve the well productivity significantly. Meanwhile, the well productiv-ity is further improved by increasing the hydraulic fracturing fluid volume during secondary fracturing regarding sweet-spot areas. The ap-plication effect of the technology has proved its availability and promotional value, which has significance for effective development of frac-tured tight oil reservoirs.geology-engineering integration; fractured tight oil reservoir; well productivity; natural fracture; fracturing scale; drainage area