低渗透油藏分层注采对应技术研究与试验

The Corresponding Technology of Separated Layer Water Injection and Production in Low Permeability Reservoirs

长庆油田低渗透油藏在纵向上表现为多套小层叠合,受超前注水、笼统注水等因素的影响,两层笼统合采油井层间压差较大,层间矛盾突出,因此开展分层注采对应技术研究。试验应用了桥式同心分层注水工艺,大大提高了分层测调施工时间、分层配注合格率。将现有的分层采油工艺技术进行优选、改进、创新,确立了"级差式防气分采泵+补偿封隔器"的分采工艺。在旗06-36井现场试验后,累计增油649t,有效期409d,实现了控制主力油层产量,发挥非主力油层的生产潜力,达到了合理开采各油层的目的。

Changqing Oilfield, which was composed of many small layers vertically, was a low permeability reservoir. Influenced by the factors of advanced water injection,there existed big pressure difference in commingled water injection in 2 layers and the contradiction between layers,therefore a technical study of separated layer injection and production was carried out. The technology of bridge type centric separated layer injection was tested and used,by which the operation time and qualified rate of separated layer injection efficiency could be greatly improved. By optimizing and improving and innovating the existing separated layer injection technology,the new technology of'differential gas preventing and separated production pump+ compensated packer'is established. The field test is performed in Well Qi 06-36,good results are achieved with accumulated oil increment of 649t and valid period of 409d,the goal of controlling major reservoir production and developing the potential productivity of non-main oil layer is realized.