Production process for manufacturing low molecular weight water

Details Production process for manufacturing low molecular weight water Production process for manufacturing low molecular weight water

1986-01-06

1987-12-01

Schofer, Joseph L.

Boring or penetrating the earth

Processes

Boring with specific fluid

166268, 166269, 166273, 166274, 166275, 252 8513, 524827, 524831, 524832, 524916, E21B 2100

Patent

active

047097671

ABSTRACT:
Disclosed is a process for preparing relatively low molecular weight, water absorbing, acrylic polymers for use as drilling fluid additives by aqueous polymerization of (A) an acrylic monomer, such as acrylic acid neutralized 0 to 100 mole percent with, for example, ammonia, and/or an alkali such as Na.sub.2 O.sub.3, and/or an amine; with (B) acrylamide in a mole ratio of 70 to 100 mole percent (A) to 30:0 mole percent (B). The molecular weight is limited to 1,000 to 50,000, such as by adding a chain transfer agent to the polymerization mixture, to achieve excellent results as a drilling fluid additive. The monomer, such as partially neutralized acrylic acid, is polymerized in aqueous solution in the presence of a polymerization initiator without external heating while allowing water to evaporate off. A substantially dry water soluble polymer (less than 15 weight percent water) is achieved when polymerization is completed by utilizing the exothermic heat of polymerization and cross-linking to drive off water without the need for additional heating to obtain a dry solid.

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