A
swellpacker has the advantages of high isolation reliability and good gas
migration resistance in open holes. This paper analyzed the contact pressure
and stress distribution of the downhole swellpacker, and optimized rubber
structure for various formations. 1) The research shows that thermal expansion
can better explain the expanding process of the rubber after adsorption of oil.
2) The maximum contact pressure occurs in the middle of rubber, and the sealing
effect of the packer increases exponentially with the length and thickness of
rubber. 3) The shear stress model established for various
formations indicates that the shear stress increases linearly with the contact
pressure. According to the formation nature in northeastern Sichuan of China, 4)
the optimum swellpacker rubber should be 18 mm
in thickness, and 1.173 m in length for sandstone formation, 1.402 m
for shale formation and 1.415 m for mudstone formation. 5) Stress
verification reveals that the rubber does not fail and can work safely in
downhole.
Cite this paper
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