Abstract:

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.

Key words: ocean, HTHP, preventing gas channeling, cement slurry, study