Petroleo Brasileiro S.a. - Petrobras

Uniao Brasileira De Educacao E Assistencia-mantenedora Da Pucrs

Dellyo Ricardo Dos Santos Alvares

Sonia Maria Cabral De Menezes

Roberto Barcala Haag

Ana Paula Santana Musse

Victor Hugo Jacks Mendes Dos Santos

Sandra Mara De Oliveira Einloft

Marta Kerber Schütz

Darlan Pontin

Felipe Dalla Vecchia

Gabriela Gonçalves Dias Ponzi

Renan Bordulis Martel

Amanda Sofia De Guimarães E Stepanha

Amanda Sofia De Guimaräes E Stepanha

The present invention describes a hydraulic cement composition, process and use thereof, wherein the composition comprises a hydraulic cement composition with increased resistance against carbon dioxide (CO) for application in reservoirs such as oil and gas and carbon capture and storage (CCS) wells; with improved performance of cement paste formulations as a material for application in primary, secondary cementing, recovery and/or plugging operations, of reservoirs/wells that operate with high COcontent; as a technological alternative to guarantee the integrity of wells in CO-rich environments for long periods of time, without any additional intervention to the already current operational procedures for cementing wells, and with cost reduction in relation to class G cement (currently, the main raw material); and sufficient chemical resistance to carry out enhanced oil (EOR) and gas (EGR) recovery by injecting high levels of CO, increasing reservoir pressure throughout the extraction period of hydrocarbon reservoirs.

Hydraulic cement composition, process and use

A fiber and a process for obtaining same from a high-modulus polyethylene, extrudable in state-of-the-art equipment and in the absence of previous solubilization in any kind of organic solvent is described, the process comprising providing such a polyethylene, introducing it in a state-of-the-art extruder, extruding it according to a temperature pattern, obtaining an extrudate that is directed to a cooling bath to have its temperature reduced, then directing the extrudate to a first stretcher where it is stretched or drawn into a fiber of improved tenacity, at a first velocity v, then heating the fiber at nearly 90&#xb0; C. and then directing said fiber to a second stretcher to be drawn at a final velocity v, wherein v&#x3c;v, at a draw ratio of 2/1 until 65/1. The tenacity of the polyethylene fiber obtained by the said process attains at least 4 gf/den, which makes it useful to naval and offshore applications.

Fiber and process for obtaining same from high-modulus, extrudable polyethylene

Process of making a fiber

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Porto Alegre, Brazil

Dellyo Ricardo Dos Santos Alvares