| Patent Number |
Title Of Patent |
Date Issued |
| 4753295 |
Method for placing ball sealers onto casing perforations in a deviated portion of a wellbore |
June 28, 1988 |
| An improved method for placing ball sealers (25) onto casing perforations (17) in a deviated wellbore (10) is disclosed. In this invention, a plurality of ball sealers (25) are introduced into the casing and are transported to the perforations at an interface (26) between two immisci |
| 4716964 |
Use of degradable ball sealers to seal casing perforations in well treatment fluid diversion |
January 5, 1988 |
| 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 |
| 4526695 |
Composition for reducing the permeability of subterranean formations |
July 2, 1985 |
| 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 |
| 4488599 |
Method of controlling displacement of propping agent in fracturing treatments |
December 18, 1984 |
| A method of preventing overdisplacement and underdisplacement of proppant during well treatments to hydraulically induce and maintain a fracture in a subterranean formation traversed by a wellbore having a perforated casing. In the practice of the method, ball sealers are incorporated in |
| 4421167 |
Method of controlling displacement of propping agent in fracturing treatments |
December 20, 1983 |
| 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 s |
| 4407368 |
Polyurethane ball sealers for well treatment fluid diversion |
October 4, 1983 |
| 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 treat |
| 4387769 |
Method for reducing the permeability of subterranean formations |
June 14, 1983 |
| 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 |
| 4287952 |
Method of selective diversion in deviated wellbores using ball sealers |
September 8, 1981 |
| 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 |
| 4244425 |
Low density ball sealers for use in well treatment fluid diversions |
January 13, 1981 |
| 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 |
| 4195690 |
Method for placing ball sealers onto casing perforations |
April 1, 1980 |
| A method is disclosed for transporting ball sealers down a perforated casing of a well to affect fluid diversion when hydraulically treating a formation penetrated by the well. In this invention, ball sealers are transported to said perforations in a carrier fluid system comprising a |
| 4194561 |
Placement apparatus and method for low density ball sealers |
March 25, 1980 |
| 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 m |
| 4187909 |
Method and apparatus for placing buoyant ball sealers |
February 12, 1980 |
| 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 |
| 4160482 |
Ball sealer diversion of matrix rate treatments of a well |
July 10, 1979 |
| A method for sequential treatment of formation strats when treating fluid is pumped into a well at a matrix rate by temporarily closing perforations in the well casing. The perforations are closed by ball sealers injected into the wall during the treatment. The ball sealers are sized to |
| 4102401 |
Well treatment fluid diversion with low density ball sealers |
July 25, 1978 |
| 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 coveri |
