胜利油区致密砂岩油藏水平井开采技术

胜利油区致密砂岩油藏资源量丰富,总体具有油藏埋藏深、储层厚度薄且孔喉细小、储量丰度低和储层纵向分布零散等特点,直井开发存在产能低、初期产量递减快、效益差的问题.为提高致密砂岩油藏的开发水平,开展了水平井开采技术攻关及试验研究,通过设计优化和施工优化,提升了水平井优快钻井技术,突破了致密油藏产能关;通过完善配套压裂完井管柱、现场注储设备和裂缝监测手段,形成了水平井裸眼分段压裂完井技术.截至2013年3月10日,在胜利油区致密砂岩油藏已实施的水平井中,正常生产井28口,工艺成功率为94.4％,累积产油量为58 602.8t,现场取得了明显的生产效果.

Study on horizontal well for development of tight sandstone reservoir in Shengli oilfield

The rich resources of tight sandstone reservoir exist in Shengli oilfield, however, it is of the features of deep, fine, thin, poor and scattered distribution. The deployment of vertical wells on low productivity reservoir can only be of the characteristics of early rapid production decline with poor efficiency. In order to improve the level of development of tight sandstone reservoir, the horizontal well technology research and test are implemented through design and operation optimization to enhance the fast drilling technology for horizontal well, and obtain the break through for the tight reservoir productivity. In the field, we formed the horizontal well techniques with multi-stage fracturing by means of perfection of matching fracturing and completion pipes, field injection and storage equipment and fracturing monitoring approaches. Until the end of 2013, the Shengli oilfield has implemented 28 horizontal wells on the tight sandstone reservoir with the success rate of 94.4%, and cumulative production up to 50 746 tons of oil. It provides the reference for the effective development of tight sandstone reservoir in Shengli oilfield.