초록 ▼

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

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 perforations. A screen means is positioned above the ball sealers to prevent upward migration of the balls to a level adjacent the upper perforations. A preferred screen means comprises a cage which is open at its lower end and has openings in its upper end which prevent passage of ball sealers therethrough and permits fluid flow down the casing and through the cage. The cage with the ball sealers therein is lowered down the casing by a conventional wireline. Once the cage and ball sealers are between the upper and lower perforations, a treating fluid more dense than the ball sealers is injected into the well to cause fluid flow. The treating fluid is caused to flow through the screen means to carry the ball sealers down the casing to plug the lower perforations while leaving the upper perforations open to fluid flow.

대표청구항 ▼

A method of treating a formation penetrated by a well provided with casing having perforations at a plurality of levels wherein a ball sealer is used for restricting flow through a lower perforation while leaving an upper perforation open to fluid flow comprising lowering to a level between said upp

A method of treating a formation penetrated by a well provided with casing having perforations at a plurality of levels wherein a ball sealer is used for restricting flow through a lower perforation while leaving an upper perforation open to fluid flow comprising lowering to a level between said upper perforation and said lower perforation a ball sealer having a size sufficient to plug the lower perforation and having a density less than the density of a treating fluid used in treating said formation; lowering screen means between said upper perforation and said lower perforation and above said ball sealer adapted to keep said ball sealer below the screen means and to permit downward flow of fluid through said screen means to carry said ball sealer downward with said fluid; and injecting a treating fluid into the casing to cause fluid flow through said upper perforation and through said screen means to carry said ball sealer to said lower perforation.