海洋高温高压气井固井防气窜水泥浆研究

性能优良的水泥浆是保证固井质量的关键因素,水泥环空气体窜槽对油气田开发将造成非常严重的后果,一旦气窜发生,即使花费大量的人力物力进行挤水泥,也难于修复到未气窜的封固状态。因此,优选有效的防气窜添加剂,研制性能良好的防窜水泥浆就显得十分重要。文中根据海洋高温高压气井的特点,提出了一套综合适用于高温高压固井的防气窜水泥浆设计的方法。设计出了密度2.40 g/cm3,适合循环温度为125℃和163℃的海洋高温高压气井固井的高密度防窜水泥浆体系。

CEMENT SLURRY STUDY FOR CEMENTING PREVENTING GAS CHANNELING AT HTHP IN GAS WELL

Good cement slurry is the key factor to guarantee the quality of the cementing. The gas flow in cement circulation is seriously a problem for the oil and gas development. Once the gas channeling in cement occurs, it is hard to repair the poor cementing, even through pumping a large amount of cement slurry. Hence, it is very important for optional selection the additive preventing the gas flow effectively, and developing good cement slurry for preventing the gas flow. According to the characters of ocean high temperature and high pressure (HTHP),The paper presented a slurry design method preventing the gas flow suitable for the cementing. The slurry density 2.40g/cm3 is the slurry system of the HTHP preventing gas channeling, which is suitable for the circulating temperature from 1250 to 1630.