Bj Services, LLC

Baker Hughes Corporation

Angel Gonzalez

Roderick B Pernites

Felipe Padilla Florencia

Jordan Lee Clark

Spacer fluids are provided for use in cementing liners in oil and gas wells. The fluids comprise pumice and a suspending agent. Pumice is the first-in weighting agent and is added in amounts sufficient to stabilize the rheology of the fluid over time and temperature.

Spacer fluids for cementing well bores

Cement slurries are provided for use in cementing oil and gas wells. The cement slurry comprises API Class C or Class H Portland cement and a pozzolan selected from the group consisting of pumice and mixtures of pumice and fly ash. Pumice is present in the mixtures in amounts at least about 40 wt % of the pozzolan. The weight ratio of the pozzolan to the cement is from about 35:65 to about 70:30. The novel cement slurries preferably will not comprise any additional lime, including hydrated lime, or other activators.

Cement slurries for well bores

A system and method that uses fluid diversion to selectively re-fracture a location of a multizone horizontal wellbore. A tubing string is extended from the surface to a location within the wellbore that is to be re-fractured. The annulus between the tubing string and the wellbore contains a first fluid and a second fluid is contained within the tubing string. The annulus may be sealed off at or near the surface and the second fluid is pumped out of the tubing string to initiate the re-fracture of the first location. The annulus seal may then be unset and the first fluid may be pumped down the annulus simultaneous to pumping a third fluid down the tubing string to re-fracture the first location. After re-fracturing the first location, the first location may be hydraulically isolated from the wellbore to permit a second location to be re-fractured.

Growing community of inventors

Katy, TX, United States of America

Angel Gonzalez