US 12,221,851 B1
Pump down wiper plug assembly
Jeffery Morrison, Missouri City, TX (US)
Assigned to FORUM US, INC., Houston, TX (US)
Filed by FORUM US, INC., Houston, TX (US)
Filed on Nov. 16, 2023, as Appl. No. 18/511,620.
Int. Cl. E21B 33/12 (2006.01); E21B 47/117 (2012.01)
CPC E21B 33/12 (2013.01) [E21B 47/117 (2020.05)] 20 Claims
OG exemplary drawing
 
1. A plug assembly, comprising:
a mandrel having an inner bore;
a wiper coupled to an outer surface of the mandrel;
a plug member coupled to a ring member via one or more releasable members and configured to temporarily close fluid flow through the inner bore of the mandrel; and
a dissolvable member coupled to the mandrel and configured to temporarily close fluid flow through the inner bore of the mandrel, wherein the dissolvable member is positioned below the plug member and the ring member, wherein a bottom surface of the dissolvable member comprises a protective coating, wherein an area between the plug member and the dissolvable member is filled with a non-reactive fluid, and wherein the non-reactive fluid comprises at least one of water, oil, hydrocarbons, low acidity fluids, and combinations thereof.