1
Steven R Erbstoesser, Claude E Cooke Jr, Richard G Sinclair, Michael M Epstein: Method for reducing the permeability of subterranean formations. Exxon Production Research Co, K C Johnson, E Eugene Thigpen, June 14, 1983: US04387769 (219 worldwide citation)

The present invention relates generally to the composition and method for reducing the permeability of subterranean formations penetrated by a wellbore. The composition of the present invention comprises a wellbore fluid having dispersed therein a fluid loss control agent comprising a polyester poly ...


2
Steven R Erbstoesser, Claude E Cooke Jr, Richard G Sinclair, Michael M Epstein: Use of degradable ball sealers to seal casing perforations in well treatment fluid diversion. Exxon Production Research Company, Hubert E Cox, Gary D Lawson, January 5, 1988: US04716964 (218 worldwide citation)

Plugging perforations in casing in a wellbore penetrating a subterranean formation using degradale ball sealers. The ball sealer used is composed of a polyester polymer which is substantially insoluble in the wellbore fluid. The polymer degrades in the presence of water at an elevated temperature to ...


3
Steven R Erbstoesser, Claude E Cooke Jr, Richard G Sinclair, Michael M Epstein: Composition for reducing the permeability of subterranean formations. Exxon Production Research Co, James J Riley Jr, Marc L Delflache, July 2, 1985: US04526695 (169 worldwide citation)

The present invention relates generally to the composition and method for reducing the permeability of subterranean formations penetrated by a wellbore. The composition of the present invention comprises a wellbore fluid having dispersed therein a fluid loss control agent comprising a polyester poly ...


4
Steven R Erbstoesser: Method and apparatus for placing buoyant ball sealers. Exxon Production Research Company, Gary D Lawson, Robert B Martin, February 12, 1980: US04187909 (94 worldwide citation)

A method and apparatus are described for diverting fluid when treating a subterranean formation penetrated by a well provided with casing having a plurality of perforations. Ball sealers having a density less than fluid in the casing are lowered down the casing between upper perforations and lower p ...


5
Steven R Erbstoesser: Method of selective diversion in deviated wellbores using ball sealers. Exxon Production Research Company, Robert B Martin, September 8, 1981: US04287952 (85 worldwide citation)

There is disclosed a method for selective diversion in a deviated wellbore comprising generally perforating the casing with a first group of perforations at the top or bottom abutting an imaginary plane which is substantially in the vertical and extends along the longitudinal axis of the casing and ...


6
Steven R Erbstoesser: Well treatment fluid diversion with low density ball sealers. Exxon Production Research Company, Gary D Lawson, July 25, 1978: US04102401 (64 worldwide citation)

A ball sealer for use as a diverting agent when treating a well having a perforated casing. The ball sealer is sized to plug a perforation and has a density less than the treating fluid. The ball sealer is made of a core material, such as syntactic foam or polymethylpentene, and a covering of a thin ...


7
Steven R Erbstoesser: Polyurethane ball sealers for well treatment fluid diversion. Exxon Production Research Company, Gary D Lawson, Robert B Martin, October 4, 1983: US04407368 (56 worldwide citation)

Ball sealers comprising a solid core coated with a polyurethane elastomer are introduced into a well to seal well perforations and divert fluid therein. In the preferred embodiment the ball sealers are used in a hydrocarbon liquid treating fluid and have a density less than the treating fluid.


8
Charles O Stokley, Steven R Erbstoesser: Placement apparatus and method for low density ball sealers. Exxon Production Research Company, Gary D Lawson, Robert B Martin, March 25, 1980: US04194561 (40 worldwide citation)

An apparatus and method for the selective placement of ball sealers for fluid treatment of a well, said ball sealers having a density less than the density of said fluid comprising a tubular member, means on said tubular member for positioning said apparatus in said well casing and means on said tub ...


9
Steven R Erbstoesser, Robert L Graham: Method of controlling displacement of propping agent in fracturing treatments. Exxon Production Research Co, Richard F Phillips, December 20, 1983: US04421167 (27 worldwide citation)

A method of preventing overdisplacement of propping agent particles during well treatments to hydraulically induce a fracture in a subterranean formation wherein buoyant or neutrally buoyant ball sealers are incorporated in the trailing end portion of the fracturing fluid. The ball sealers seat on a ...


10
Steven R Erbstoesser: Low density ball sealers for use in well treatment fluid diversions. Exxon Production Research Company, Robert B Martin, January 13, 1981: US04244425 (23 worldwide citation)

A ball sealer for use as a diverting agent when treating a well having a perforated casing. The ball sealer is sized to plug a perforation and has a density less than the treating fluid. The ball sealer comprises a material, such as syntactic foam or polymethylpentene. The ball sealer is also prefer ...