Wells – Processes – Cementing – plugging or consolidating
Patent
1986-01-09
1987-06-23
Suchfield, George A.
Wells
Processes
Cementing, plugging or consolidating
166369, 166376, 166292, 166902, E21B 3314, E21B 4102
Patent
active
046745726
ABSTRACT:
Corrosion and erosion of metal well casings due to production of corrosive well fluids, especially geothermal brines, is avoided by producing corrosive fluids through an impermeable cement wellhousing comprised of inner and outer substantially continuous cement liners which envelop and insulate from corrosion and erosion a conventional outer metal or other well casing while the outer casing internally reinforces the cement well housing. A second, sacrificial metal casing of smaller diameter is used in cementing the inner cement liner and can be substantially corroded away by corrosive fluids without substantial damage to the remaining cement wellhousing or outer casing through which corrosive fluids are produced. An apparatus for producing corrosive fluids, particularly geothermal brine, contained in a subterranean formation is also disclosed.
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"Corrosion of Metals by Geothermal Fluids in Taiwan's Tatun Volcanic Region and Novel Approaches for Controlling the Problem", by P. P. Cherng and J. R. Wang in Proceedings of the International Symposium on Solving Corrosion and Scaling Problems in Geothermal Systems, Symposium held Jan. 17-20, 1983, pp. 285-293.
Bostich June M.
Sandford Dean
Suchfield George A.
Union Oil Company of California
Wirzbicki Gregory F.
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