US 12,281,539 B2
Wellbore pressure insensitive hydraulic piston configuration
Marco Quilico, Pearland, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 18/260,495
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Dec. 20, 2021, PCT No. PCT/US2021/064365
§ 371(c)(1), (2) Date Jul. 6, 2023,
PCT Pub. No. WO2022/154944, PCT Pub. Date Jul. 21, 2022.
Claims priority of provisional application 63/137,394, filed on Jan. 14, 2021.
Prior Publication US 2024/0301768 A1, Sep. 12, 2024
Int. Cl. E21B 34/08 (2006.01)
CPC E21B 34/08 (2013.01) [E21B 2200/05 (2020.05)] 16 Claims
OG exemplary drawing
 
1. A tubing pressure insensitive and hydrostatic pressure insensitive control system, comprising:
a housing;
a hydraulic piston sealingly disposed in the housing via a first seal set;
a balance piston sealingly disposed in the housing via, at least, a second seal set and a third seal set, wherein the hydraulic piston and the balance piston are sequentially movable;
wherein the housing comprises a control pressure chamber associated with the hydraulic piston, and a balance pressure chamber associated with the balance piston, and wherein the balance piston comprises a through piston communication port allowing for fluid communication between the balance pressure chamber and an area in the housing between the hydraulic piston and the balance piston;
a control line from the housing to surface, the control line being in fluid communication with the control pressure chamber; and
a balance line from the housing to the surface, the balance line being in fluid communication with the balance pressure chamber.