The Effects of Shearing Stress Along the Annulus Wall on the Cementing Quality

Abstract:

The replacement efficiency problems encountered in casing cementing practice in Caracoles Oil Field of Venezuela was resolved by using wall surface shearing stress cementing. The main points of wall surface shearing stress cementing are as follows. The results of three type of cementation logging, e.g. CBL, VDL and SBT, can be ensured to meet the requirements, while the shearing stress along the well surface reached 15 Pa during grouting. When the shearing stress reached 30 Pa the results of CBL, VDL and SBT cementation logging can reach the best. High shearing stress can be gained by turbulence or by increasing gel strength of grout.