Abstract: Dissolvable pump down devices, dissolvable pump down assemblies, and methods to propel a bottomhole assembly through a lateral section are presented. A dissolvable pump down device includes an engageable portion, and one or more expandable pieces that are initially in a first position before the dissolvable pump down device is deployed in a wellbore, and configured to expand from the first position to a second position in response to a force generated by fluid flow of fluid through the wellbore. A diameter of the expandable pieces while the expandable pieces are in the first position is less than the diameter of the one or more expandable pieces while the one or more expandable pieces are in the second position. The engageable portion and the one or more expandable pieces are configured to dissolve after the dissolvable pump down device is positioned at the desired wellbore location.

Abstract: Dissolvable pump down devices, dissolvable pump down assemblies, and methods to propel a bottomhole assembly through a lateral section are presented. A dissolvable pump down device includes an engageable portion, and one or more expandable pieces that are initially in a first position before the dissolvable pump down device is deployed in a wellbore, and configured to expand from the first position to a second position in response to a force generated by fluid flow of fluid through the wellbore. A diameter of the expandable pieces while the expandable pieces are in the first position is less than the diameter of the one or more expandable pieces while the one or more expandable pieces are in the second position. The engageable portion and the one or more expandable pieces are configured to dissolve after the dissolvable pump down device is positioned at the desired wellbore location.

Abstract: A wellbore isolation device, comprising: a mandrel 24 having a cylindrical body, a sealing element 38 disposed about the mandrel 24 and radially expandable from a first run-in diameter to sealing engagement with the an inner surface 50 of the wellbore 6; a metal backup ring 60 disposed on the mandrel 24 contacting one side of the sealing element system 38 with an initial height H and radially expandable and axially deformable to abut the inner surface 50 of the wellbore 6; wherein the metal backup ring 60 is a concave cross-section about the mandrel 24 with an uphole leg and a downhole leg; and wherein an applied compressive force expands the sealing element system 38 into sealing engagement with the wellbore 6 and the metal backup ring 60 radially expands while axially deforming to abut the inner surface 50 of the wellbore 6 with no contact pressure.