Slotted liners are the most common sand control completion used for SAGD exploitation. With the trend to exploit high heterogeneity reservoirs using SAGD technology further pushes the bounds of the long term performance of slotted liners. Both downhole sand, clays and fines and in-situ thermal-chemical effects can have detrimental effects on the long term performance of sand control products. Mechanical sand control design of slotted liners are robust and are well quantified with lab testing such that slotted liners are typically designed with open areas far in excess of the fluid in-flow requirements of the well, with design safety factors allowing for long term performance even if a portion of the liner open area is reduced over time. In-situ thermal-chemical effects such as corrosion and scales, nevertheless, are less known and may predominantly govern the performance impairment issues of slotted liners over time. It is suggested that the potential solutions to the thermal-chemical effects to the slotted liners need to involve minimizing corrosion effects, as well as minimizing scaling using substrate metal bonded coatings combined with properly designed slot width geometries. In this paper, the known causes of inflow failures and the new technological advancements to slotted liners will be reviewed. The theories, history and background to substrate metal bounded coating for SAGD slotted liners will be introduced. In addition to the lab testing results, field verification tests using substrate coating of production tubing in a SAGD producer well will be illustrated in detail.

You can access this article if you purchase or spend a download.