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These results show that the fluid rapidly forms a seal at 1,000 psi and drastically lowers the fluid lost to the formation. It can be concluded that the fluid was effective at temperatures up to 300 °F and displayed no signs of degradation. As the temperature was increased to above 310 °F, there was some indication of deterioration in performance,. However, a seal was maintained as material, which had been stored at the elevated temperature, moved onto the filter face, although the dynamic fluid loss had increased.
At the end of the analysis, the core was cooled to 250 °F and it was back flowed with seawater at a differential pressure of only 1.3 psi, resulting in 92% permeability regain.
These laboratory tests established that Liquid Casing® would be effective in a polymer based fluid at temperatures above 350 °F, and that the filter cake can be easily removed by back flowing the well at very low pressures and with minimum damage.
The test results confirm the field experience and observation established by a number of operators.
It is worth noting that the temperature parameters in this study were limited by the thermal stability of the biopolymers. The NAPC in the Kavala offshore area in northern Greece has used Liquid Casing® to kill wells with high levels of hydrogen sulfide and bottom hole temperatures of 290 °F.
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