超深超稠油井矿物绝缘电缆加热降黏工艺研究与应用

塔河油田碳酸盐岩油藏为超深超稠油油藏,原油在井筒2000~3000 m处开始失去流动性。井筒加热降黏工艺由于受常规电加热杆加热深度限制,无法适应黏温拐点大于2000 m油井需要。矿物绝缘加热电缆以连续高品质铜线为发热导体,特种矿物材料为绝缘层,具有发热效率高、质量轻强度大、加热深的特点,加热深度可达3000 m以上。结合塔河油田TH12177CH井生产情况及矿物绝缘电缆特点,开展了矿物绝缘电缆加热降黏工艺设计,试验后井口温度提高了38℃,节约稀油率可达56.4%。

Mineral insulated heating cable used in ultra-deep ultra-heavy oil wells

Carbonate reservoirs in the Tahe Oilfield are ultra-deep and ultra-heavy oil reservoirs. Oils stop flowing at the depth of 2000-3000 m. The conventional heating method to reduce viscosity with electric heating rods is restricted by heating depth, and fails at the depth of 2000 m. Mineral insulated cable uses continuous and high qua-lity copper wire as heat conductor and special mineral material as insulation. So, it is more effective and lighter, and can work in wells deeper than 3000 m. The mineral insulated heating cable was applied in well TH12177CH in the Tahe Oil Field. Well head temperature rose by 38℃ and the light oil saving rate increased to 56.4%.