Wells – Processes – Separate steps of fracturing or attacking formation
Patent
1983-06-24
1985-09-17
Lechert, Jr., Stephen J.
Wells
Processes
Separate steps of fracturing or attacking formation
166307, 252 85A, 252 855C, 252 855B, 252 855R, C09K 702, E21B 4327
Patent
active
045414858
ABSTRACT:
An aqueous completion or workover fluid for oil or gas wells having at least two solid components. One component is a hydroxy containing aluminum compound represented by the formula AlO(OH).xH.sub.2 O. The second component is a fluid loss control agent which can be either a cross-linked polyvinyl alcohol or a cross-linked hydroxyalkyl cellulose reaction product. An acid soluble weighting agent can be added for wells having higher down hole pressures. Examples of the weighting agents include iron carbonates, iron oxides, calcium carbonates, dolomite, sodium or calcium chloride, zinc bromide and calcium bromide. After use, the fluid can be displaced from the well with acid, e.g. 15% HCl, and the cake previously deposited on the bore-hole wall is dissolved by the acid so that no damaging residue remains.
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Block, J. 1982, New Mud System Gets Field Trial, Oil and Gas Journal, Jan. 11, pp. 79-82.
Cabic Edward J.
Lechert Jr. Stephen J.
Locker Howard J.
W. R. Grace & Co.
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