There are three main objectives when constructing and completing heavy oil wells: accurate well placement, wellbore stability and longevity, and production efficiency.
Drillers deal with borehole stability issues in typically unconsolidated heavy oil reservoirs by selecting the right bit for high penetration rates, and the correct drilling fluid to ensure circulation and cool the bit.
Advances in well placement technologies provide the ability to see the reservoir as it is being drilled, eliminating sidetracks on wells and enhancing production. The position of formation and fluid boundaries can be continuously monitored to ensure the well can be drilled entirely in the sweet spot.
In the unconsolidated sand environments common to many heavy oil reservoirs, high viscosity causes destabilization of the rock formation and mobility issues. Cements with a low Young’s modulus can deliver mechanical properties appropriate for downhole thermal stress environments offering better lifelong zonal isolation.
Optimizing recovery, managing cost, and meeting environmental standards in steam-assisted gravity drainage (SAGD) projects make achieving economic success a complex challenge.
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