特稠油化学复合吞吐工艺技术研究与应用

孤岛油田低品位稠油油藏储层发育和流体物性差,开采难度大。目前采出程度为5.5%,采油速度仅为0.36%,为典型的双低单元。针对该油藏在开发中存在的注汽压力高、注汽效果差、周期产油量低等问题,分别开展了CO2、油溶性降黏剂以及二者协同作用改善特稠油物性机理研究。在矿场应用中,结合油藏地质特点,不同开发特征井应用不同的化学复合吞吐工艺组合,取得好的增油效果。

Research and application on the chemical compound huffing and puffing technology of high viscous grade oil

The low-grade heavy oil reservoir in the Gudao oilfield is a typical double-low unit. The present recovery percent of reserves is 5. 5% , and the oil production rate is only 0. 36% . Exploitation is difficult because of poor reservoir development and fluid properties. Due to the serious problems of high-pressure steam injection, poor steam injection effect and low-cycle oil production in the reservoir developing, the study to improve heavy oil properties through injecting CO_2, oil-soluble viscosity reducer, and both was carried out. In field application, combined with the geological characteristics of reservoirs, different chemical compound huffing and puffing technology were applied in wells of different development characteristics. It achieved obvious effects of oil incremental.