Abstract:

KCOOH is made of HCOOH and KOH at high temperature and high pressure (HTHP). It was successfully used as a new additive in high-density drilling and completion fluid system at the end of the 1990s’overseas. Because of the outstanding properties such as strong inhibition, good compatibi1ity, environmental protection, oi1 reservoir protection, and so on, this paper stressed the application technology of KCOOH in MB5001 well of Mobei 005 area, Kelamayi in Xinjiang. The results showed that KCOOH could strongly inhibit clay hydration, and made MBT low level, and the rock debris returning out from the well presented small circular particle, and its inside was dry, and drilling fluid would not be attached to screen shaker and ran out. So it had the special properties such as strong inhibition, good filtration characteristics, good lubrication, fast machine rotation, low cost, good economic benefits, and so on.

Key words: drilling fluid additive, weighting drilling fluid, formation damage prevention, KCOOH-drilling fluid