环空流动壁面剪应力对固井质量的影响

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

摘要:

应用壁面剪应力固井解决了委内瑞拉Caracoles油田固井实践中存在的顶替效率问题。壁面剪应力固井的主要观点是：水泥浆在环空流动的壁面剪应力达到15 Pa时，可以保证CBL、VDL和SBT三项胶结测井结果合格；水泥浆在环空流动的壁面剪应力达到30 Pa时，可以保证CBL、VDL和SBT三项胶结测井结果优质。高的壁面剪应力可以通过紊流获得，也可以通过提高水泥浆粘切力获得。

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.