Research and Application of Cement Slurry for Long Cementing Section in Ultra-deep Well in Sichuan

In view of the challenge which cement slurry designed for high temperature fail to set at a lower temperature for long time when cementing long sections,a great temperature difference cement slurry system was developed that can be used in 70-160 ℃(BHST).The experimental results show that the cement stone on the top of the cement slurry has a certain compressive strength within 24 hours,and the slurry is stable,the properties of the fluidity,thicken,anti-channeling are good.Also it has a lowAPI filtration,no shrinkage,and toughened by fiber.The applications in three deep wells were successful.