Time-lapse, cased hole torque and drag (T&D) measurements and soft string T&D modeling were undertaken in two experimental horizontal steam injection wells for the purpose of assessing the integrity of the slotted liner completions over a 20 month period. A series of progressively complex completions were installed in the wells to manage steam conformance and measure steam injection flow profiles in this mobile, heavy oil application. This T&D work was done to understand if sand influx, scale and asphaltene deposition, or thermal strain damage was occurring within the slotted liner thus increasing the deployment and recovery risk of the tubing-deployed completions. For each injector, T&D measurements were repeatedly obtained at the same depths during each workover with the same 3-1/2 inch (89 mm) tubing string.

T&D data is inexpensive and easy to acquire during rig operations. Commercial software is readily available to model T&D and estimate cased hole friction factors (CHFF). Analysis of T&D in these wells did provide insights for sand influx and scale deposition. However, T&D analysis did not provide insights into all integrity problems encountered which included metal clamp debris that would not allow packers to be landed at the target depth and corrosion failures resulting in parted tubing. T&D measurement analysis is a useful integrity diagnostic in horizontal injectors, but needs to be supplemented with other information to get a complete picture of wellbore conditions. Considering the general lack of information that heavy oil operators get from the horizontal section of their wells, it is recommended that baseline cased hole T&D measurements be acquired on horizontal wells during initial completion with 0.1 Kip precision. Comparing both T&D measurements and CHFF's on subsequent workovers did provide insights on the stability of horizontal wellbore conditions.

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