US 11,753,907 B2
Pressure adjuster for a downhole tool
Edward George Parkin, Whitminster (GB); Julien Steimetz, Bristol (GB); Cecily Millwater, Hampshire (GB); and Michael Pearce, Cheltenham (GB)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 17/604,469
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Apr. 30, 2020, PCT No. PCT/US2020/030634
§ 371(c)(1), (2) Date Oct. 18, 2021,
PCT Pub. No. WO2020/226989, PCT Pub. Date Nov. 12, 2020.
Claims priority of provisional application 62/842,836, filed on May 3, 2019.
Prior Publication US 2022/0213763 A1, Jul. 7, 2022
Int. Cl. E21B 4/00 (2006.01); E21B 41/00 (2006.01); E21B 34/08 (2006.01); E21B 34/06 (2006.01)
CPC E21B 41/0085 (2013.01) [E21B 34/06 (2013.01); E21B 34/08 (2013.01); E21B 2200/02 (2020.05)] 18 Claims
OG exemplary drawing
 
1. A downhole tool, comprising:
a housing;
a housing chamber disposed within the housing;
a fluid chamber disposed within the housing;
a partition disposed within the housing, the partition separating the housing chamber from the fluid chamber;
a movable member disposed within the housing, the moveable member configured to move relative to the housing through the partition, and the moveable member further configured to restrict flow between the housing chamber and the fluid chamber to maintain a pressure differential between the housing chamber and the fluid chamber; and
at least one pressure adjuster separate and distinct from the moveable member, the at least one pressure adjuster operably disposed between the housing chamber and the fluid chamber, and the at least one pressure adjuster configured to maintain the pressure differential between the housing chamber and the fluid chamber below a maximum pressure differential set by the pressure adjuster.