Steam generation accounts for 65% of the operating costs for oil sands operators who employ thermal in-situ recovery techniques. Because of this, steam oil ratio (SOR) is one of the key performance metrics for measuring the performance of these operations. Consequently, operators are constantly looking for innovative ways to reduce the amount of steam required to effectively mobilize the viscous bitumen and to get it flowing to the producer well and surface. Any improved thermal efficiencies that can be gained through innovative well construction, completion and operations warrants serious consideration.
Halliburton’s solution is a highly insulative foam cement. This foam cement increases steam injection efficiency by lowering conductive heat loss surrounding the injector wellbore and features superior insulating properties. These corrosion resistant foam cements are also available for low pH conditions. The result is improved oil flow and lower on-going well operating costs. In addition to this technology, Halliburton has a reliable supply of base cement materials.
In this Western U.S. well, the ZoneSeal® dual injection method was chosen because of significant CO2 gas breakthrough in the wellbore annulus (~3,000 ppm), plus the fact that pumping down the annulus was projected to be a way to contain/kill CO2 gas.