Wells – Processes – Cementing – plugging or consolidating
Patent
1990-01-02
1991-04-09
Suchfield, George A.
Wells
Processes
Cementing, plugging or consolidating
166300, 523130, E21B 33138, E21B 33134
Patent
active
050056484
ABSTRACT:
Wells penetrating oil-producing and water-producing intervals may be treated in order to reduce the flow rate of water into the well by isolating the water-producing interval and introducing into it a volume of treating fluids sufficient to invade at least six inches into the permeable formation comprising the water-producing interval. Cased wells may be treated to plug holes in the casing caused by corrosion or casing breaks by introducing a treating fluid into the formation adjacent to the break. The treating fluid comprises a material which can be acid catalyzed in a period of from 1 to 16 hours at formation conditions, preferably a monomer or oligomer of furfuryl alcohol. The treating fluid contains from 40 to 60 percent furfuryl alcohol and from 40 to 60 percent of an ester, preferably ethyl acetate or butyl acetate. The catalyst is preferably orthonitrobenzoic acid or toluene sulfonic acid in a concentration of from 1 to 4 percent by weight. The acid and concentration of acid are selected to produce a set time at the formation temperature in the range of from 1 to 16 hours, so the treating fluid will flow into and saturate the pore space of the portion of the formation being treated.
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Friedman Robert H.
Surles Billy W.
Park Jack H.
Priem Kenneth R.
Suchfield George A.
Texaco Inc.
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