1
Burton M Casad, Charles R Clark, Lisa A Cantu, D Philip Cords, Edward F McBride: Process for the preparation of fluid loss additive and gel breaker. Conoco, January 22, 1991: US04986355 (204 worldwide citation)

A melted polymer of hydroxyacetic acid with itself or with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties is subjected to high shear and injected into an organic liquid which is inert to the polymer to form an organic liquid dispersion of very fine polymer particles. ...


2
Lisa A Cantu, Edward F McBride, Marion W Osborne: Formation fracturing process. Conoco, E I Du Pont de Nemours and Company, July 18, 1989: US04848467 (201 worldwide citation)

Hydroxyacetic acid condensation product is used as a fluid loss material in a formation fracturing process in which a fracturing fluid comprising a hydrolyzable aqueous gel is used. The hydroxyacetic acid condensation product degrades at formation conditions to provide hydroxyacetic acid which break ...


3
Lisa A Cantu, Marion W Osborne, Edward F McBride: Well treatment process. Conoco, Richard W Collins, September 18, 1990: US04957165 (194 worldwide citation)

Hydroxyacetic acid condensation product is used as a fluid loss material in a well completion or workover process in which a fluid comprising a hydrolyzable aqueous gel is used. The hydroxyacetic acid condensation product degrades at formation conditions to provide hydroxyacetic acid which breaks th ...


4
Harold E Bellis, Edward F McBride: Composition and method for temporarily reducing permeability of subterranean formations. E I Du Pont de Nemours and Company, Craig H Evans, December 29, 1987: US04715967 (163 worldwide citation)

This invention relates to a composition and method of temporarily reducing the permeability of subterranean formations penetrated by a wellbore. In particular, it relates to an inexpensive, low molecular weight condensation product of hydroxy acetic acid with itself or compounds containing other hyd ...


5
Charles R Clark, Donald L Whitfill, D Philip Cords, Edward F McBride, Harold E Bellis: Placement process for oil field chemicals. Conoco, E I DuPont de Nemours and Company, January 22, 1991: US04986353 (162 worldwide citation)

Oil field chemicals are incorporated in polymeric particles of the condensation product of hydroxyacetic acid or the co-condensation product of hydroxyacetic acid and other compounds containing hydroxy-, carboxylic acid-, or hydroxycarboxylic acid moieties. The particles are introduced into an oil w ...


6
Edward F McBride: Sulfonation process. E I Du Pont de Nemours and Company, May 26, 1992: US05117041 (1 worldwide citation)

Allyl end-capped propylene terephthalate polyester oligomers are sulfonated in an aqueous system in the presence of a free radical initiator by a process in which only a part (about 15% to 40%) of the source of bisulfite is added at the start of the sulfonation step with the remainder being added la ...