Method for forming a barrier to fluid flow in an oil formation a

Details Method for forming a barrier to fluid flow in an oil formation a Method for forming a barrier to fluid flow in an oil formation a

1988-09-09

1989-04-04

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

E21B 33138

Patent

active

048177202

ABSTRACT:
Our invention pertains to a method of treating an oil well completed in an oil containing consolidated limestone or dolomite formation, to form a fluid impermeable barrier in the formation some distance from the oil well. The barrier may be a cone or pancake shaped barrier below the perforation to prevent bottom water coning, or a cylindrical barrier may be formed opposite portions of the well perforations. An aqueous hydrcarbon emulsion treating fluid is used which comprises a hydrocarbon, water and surfactant, whose pH is in the rqnge of from 2 to 6 and preferably adjusted to a level determined experimentally to cause precipitation of hydrocarbon after exposure to the formation from 7 to 14 days. First the emulsion and then the displacement fluid are injected into the formation at a predetermined injection rate which causes the polyvalent metal ions to be extracted from said formation and accumulated in the treating fluid at a controlled rate. The level of polyvalent metal ions in the treating fluid reaches a critical concentration for precipitating hydrocarbon from the treating fluid after the treating fluid has been displaced away from the wellbore to the desired location.

REFERENCES:
patent: 2294078 (1942-08-01), Dow et al.
patent: 3386514 (1968-06-01), Weber
patent: 3811508 (1974-05-01), Friedman
patent: 3866685 (1975-02-01), Friedman
patent: 4275788 (1981-06-01), Sweatman
patent: 4352396 (1982-10-01), Friedman
patent: 4475593 (1984-10-01), Friedman
patent: 4662449 (1987-05-01), Friedman

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