大庆敖南油田第一口阶梯水平井钻井实践

Application of the first horizontal well in Aonan Oilfield of Daqing

大庆敖南地区葡萄花油层渗透性低、油层层数多、储层厚度薄、隔层厚度小,为加快此类油层的经济有效开发,开展水平井和直井联合开发试验研究,决定采用阶梯式水平井进行开发。通过对油层段的反复穿越,增大油层暴露面积,大幅度提高单井产量、提高储量控制程度,使未动用储量达到经济有效开发。在分析大庆外围油藏储层特点的基础上,介绍了敖南油田第1口阶梯水平井敖南242-平317井的设计施工情况,阐述了薄油层阶梯形水平井施工的一些难点和相应的技术措施。该井的成功完钻,证明中半径阶梯形水平井可以提高薄油层砂岩钻遇率,适合于敖南区块开发,具有推广价值;同时也为低渗透、多油层的经济有效动用提供了技术支持,为拓展勘探领域和相似地质条件下未动用储量的经济有效开发奠定基础。

Putaohua reservoir in Aonan region of Daqing features in low permeability, large number of reservoirs, thin reservoir thickness, and small interlayer thickness. Staircase horizontal wells are proposed to effectively and economically develop this kind of reservoir and carry out experimental research on joint development of horizontal and vertical wells. Unproducing reserves are effectively and economically developed based on repeated penetration of reservoirs, augmenting reservoir exposing area, considerably increasing single well oil output, and improving the degree of reserves control. This paper analyzes the characteristic of the reservoirs of Daqing peripheral oilfield, deals with the design and construction of the first staircase horizontal well of Aonan Oilfield-Aonan 242-ping 317, and illustrates some difficulties and countermeasures to construct staircase horizontal wells in thin reservoirs. This well has been successfully drilled, which proves that medium-radius horizontal wells can improve the drilling meeting efficiency of sandstones in thin reservoirs and are suitable for developing Aonan reservoirs. In addition, their application provides technical support for the economic and effective production of low permeability multi-layer reservoirs and lays a solid foundation for the expansion of exploration area and the economic and effective production of the unproducing reserves under complex geological conditions.