Patent ID: 11920440
Assignee: RENEWELL ENERGY
Field: Civil engineering (Other fields)
Classification: CPC E  F  H  Y | IPC E  F  H

Claim 18:
19. A method for retrofitting a well, comprising:
installing a potential energy conversion system into an interval of a non-producing well, the potential energy conversion system comprising a movable mass suspended by a line in the non-producing well, and the line being coupled to a motor operable to lift the movable mass and a generator operable to produce electricity when lowering the movable mass within the interval; and
installing an aqueous fluid into the interval of the non-producing well;
wherein the non-producing well has an upper section and a lower section divided by a plug isolating the upper section from the lower section, the movable mass and the fluid are located within the upper section, and the movable mass is movable through the fluid; and
wherein the aqueous fluid is not a connate fluid, and the plug prevents entry of connate fluids into the interval.