Dissolvable pump down devices, dissolvable pump down assemblies, and methods to propel a bottomhole assembly through a lateral section of a wellbore

A dissolvable pump down assembly comprising:

• a wellbore isolation device configured to set at a desired wellbore location to form a fluid seal;
• and a dissolvable pump down device comprising:
• an engageable portion;
• and
• one or more expandable pieces, each of the one or more expandable pieces initially being in a first position before the dissolvable pump down device is deployed in a wellbore, and each of the one or more expandable pieces configured to expand from the first position to a second position in response to a force generated by fluid flow of a fluid through the wellbore,
• wherein a diameter of the one or more expandable pieces while the one or more 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, and
• wherein 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.

A method to deploy a bottomhole assembly through a lateral section of a wellbore, comprising:

• deploying a dissolvable pump down device that is coupled to a bottomhole assembly into a wellbore, the dissolvable pump down device comprising:
• an engageable portion;
• and
• one or more expandable pieces, each of the one or more expandable pieces initially being in a first position before the dissolvable pump down device is deployed in a wellbore;
• applying a threshold amount of fluid force to the one or more expandable pieces to expand the one or more expandable pieces from the first position to a second position, wherein a diameter of the one or more expandable pieces while the one or more 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;
• and
• propelling the dissolvable pump down device to a desired location in a lateral section of the wellbore.