Yvis Oliveira - Academia.edu (original) (raw)

Papers by Yvis Oliveira

Research paper thumbnail of Analysis of different oil well cement slurry formulations exposed to a CO2-rich environment

Journal of CO2 Utilization, 2021

Abstract Portland cement hydrated products exposure to carbon dioxide (CO2) results in physicoche... more Abstract Portland cement hydrated products exposure to carbon dioxide (CO2) results in physicochemical transformations which are deleterious for the cement matrix. Therefore, cement slurry formulations need to be designed carefully to handle situations where the hardened cement will be exposed to CO2, so optimized formulations need to be considered. The present study investigated different cement slurry formulations and different densities for each formulation, with all samples exposed to CO2 during periods of 30, 60 and 90 days. The densities studied were 15.8 ppg (1890 kg/m³), 16.5 ppg (1980 kg/m³) and 17.0 ppg (2040 kg/m³), for which the study started with a simple composition and other additives were put into the formulations, with the last being the most complex. Static sedimentation analysis, carbonation depth and area calculation were used to investigate the effects of carbonation on the systems, and the results showed that the optimized formulation designs presented the best results on CO2 attack in the highest densities of 16.5 ppg and 17.0 ppg. A proper formulation designed for application in CO2-rich wells is mandatory for the well integrity from the construction phase to abandonment.

Research paper thumbnail of Evaluation of reused polyester resin from PET bottles for application as a potential barrier material

Journal of Petroleum Science and Engineering, 2021

Abstract Resin systems containing reused polyethylene terephthalate (PET) in their composition we... more Abstract Resin systems containing reused polyethylene terephthalate (PET) in their composition were evaluated, as well as the influence of montmorillonite and dolomite for application in plugging and abandonment (P&A) and remedial operations as an alternative material to conventional cementing. The resin compositions were characterized using infrared, with characteristic bands of polyester and styrene monomers being identified in all systems, even with the addition of the thixotropic agent and mineral filler. Compressive strength (CS), rheology, and stability under sedimentation tests were performed. The pure polyester resin showed a CS value above 90 MPa for all curing times. This result is 12 times higher than the minimum required for abandonment operations (7 MPa). All systems presented Newtonian behavior and the addition of 5% dolomite decreased the apparent viscosity. The optimum systems was formulated with 0.1 montmorillonite and 5% dolomite. Based on the results presented, with high compressive strength and low viscosity, the polyester resin proved to be promising for application in well cementing to P&A and remedial operations.

Research paper thumbnail of Evaluation of density influence on resistance to carbonation process in oil well cement slurries

Construction and Building Materials, 2019

h i g h l i g h t s Cement slurries with different densities exposed to CO 2. Investigation of ca... more h i g h l i g h t s Cement slurries with different densities exposed to CO 2. Investigation of carbonation caused by the medium with CO 2. Analysis of the progress of carbonation over time intervals.

Research paper thumbnail of Carbonation in oil well Portland cement: Influence of hydration time prior to contact with CO2

Construction and Building Materials, 2018

h i g h l i g h t s Different scenarios: CO 2 naturally present in rock or artificially injected.... more h i g h l i g h t s Different scenarios: CO 2 naturally present in rock or artificially injected. Exposure to CO 2 and analysis of influence on the cement hydrated previously. Analysis of the progress of carbonation and characterization of the formed phases.

Research paper thumbnail of Effects of carbon dioxide in Portland cement: A relation between static sedimentation and carbonation

Construction and Building Materials, 2017

The carbonation process related with static sedimentation in class G Portland cement slurries. Co... more The carbonation process related with static sedimentation in class G Portland cement slurries. Concepts of fluid mechanics applied in the physical interpretation to cement carbonation process. A model for relating static sedimentation mechanism and carbonation is proposed.

Research paper thumbnail of Alternative Material to be Applied in Oil Well Cementing Subjected to High Temperatures to Avoid Compressive Strength Retrogression

Offshore Technology Conference, 2019

When Portland cement sheath is submitted to temperatures above 110 °C in oil well wellbore condit... more When Portland cement sheath is submitted to temperatures above 110 °C in oil well wellbore conditions, the compressive strength retrogression phenomenon is observed. This occurs due to the conversion of calcium silicate hydrate (C-S-H) to unstable phases, resulting in low compressive strength and high permeability. To minimize that compressive strength issue, guidelines suggests the addition of 35-40% BWOC (By Weight Of Cement) of an extra silica source to balance the relation CaO/SiO2 and convert it into more stable calcium silicate phases. Silica flour (SF) is the silica source worldwide used as anti-strength retrogression agent in cementing operations. The present work presents rice husk ash (RHA) as a sustainable silica source, in alternative to SF, for temperature of the environments where compressive strength retrogression is pronounced. Four compositions of cement slurries were tested: (i) a 15.6 ppg slurry with no silica addition (SF0); (ii) a 15.6 ppg slurry with 35% BWOC o...

Research paper thumbnail of Giant Calculus in the Ureteropelvic Junction: A Case Report

Journal of Medicine, 2014

Urinary lithiasis is an affection of high social impact associated with high costs. Its incidence... more Urinary lithiasis is an affection of high social impact associated with high costs. Its incidence varies from 1 to 15% in the general population and has a recurrence chance of 26-50%. We report one rare case of giant ureteral calculus in the ureteropelvic junction in a patient with complaints of left lumbar pain and recurrent urinary tract infection diagnosed in the outpatients' Urology clinics. Antibioticotherapy was instituted and complementary tests were done. The abdomen x-ray showed a large opacity in the left kidney topography, and the computed tomography evidenced a giant left ureteral calculus associated with a large ureteropelvic junction dilation and grade III hydronephrosis. An ureterolitothomy was performed and evidenced a calculus of 9.5x6.5cm and weighting 347g. The patient became well after the surgery, and a pyelogram evidenced dilation of both caliceal groups and left ureter, without any calculus. Urinary lithiasis should be early diagnosed and treated in order to avoid severe complications as the presented here.

Research paper thumbnail of PROPRIEDADES DINÂMICO-MECÂNICAS DE ELASTÔMEROS TERMOPLÁSTICOS A BASE DE PÓ DE PNEU RECICLADO

The blend of ground tire rubber (GTR), ethylene and 1-octene copolymer (POE) with different octyl... more The blend of ground tire rubber (GTR), ethylene and 1-octene copolymer (POE) with different octylene content (Engage 8003, 8100, 8480) and linear low density polyethylene (LLDPE) was performed by melt-mixing in a corotating twin-screw extruder. The dynamic mechanical results revealed that higher values of elastic modulus were obtained by the addition of GTR, as a function of its rigidity. However, the partial substitution of GTR by POE decreased these values as a consequence of POE elastomeric characteristics. Finally, the tensile properties were considerable improved by adding only 5% of POE to LLDPE/PBP 50/45 blends., suggesting that POE act as a compatibilizer and can actually improve the dispersion of GRT in LLDPE matrix..

Research paper thumbnail of Analysis of different oil well cement slurry formulations exposed to a CO2-rich environment

Journal of CO2 Utilization, 2021

Abstract Portland cement hydrated products exposure to carbon dioxide (CO2) results in physicoche... more Abstract Portland cement hydrated products exposure to carbon dioxide (CO2) results in physicochemical transformations which are deleterious for the cement matrix. Therefore, cement slurry formulations need to be designed carefully to handle situations where the hardened cement will be exposed to CO2, so optimized formulations need to be considered. The present study investigated different cement slurry formulations and different densities for each formulation, with all samples exposed to CO2 during periods of 30, 60 and 90 days. The densities studied were 15.8 ppg (1890 kg/m³), 16.5 ppg (1980 kg/m³) and 17.0 ppg (2040 kg/m³), for which the study started with a simple composition and other additives were put into the formulations, with the last being the most complex. Static sedimentation analysis, carbonation depth and area calculation were used to investigate the effects of carbonation on the systems, and the results showed that the optimized formulation designs presented the best results on CO2 attack in the highest densities of 16.5 ppg and 17.0 ppg. A proper formulation designed for application in CO2-rich wells is mandatory for the well integrity from the construction phase to abandonment.

Research paper thumbnail of Evaluation of reused polyester resin from PET bottles for application as a potential barrier material

Journal of Petroleum Science and Engineering, 2021

Abstract Resin systems containing reused polyethylene terephthalate (PET) in their composition we... more Abstract Resin systems containing reused polyethylene terephthalate (PET) in their composition were evaluated, as well as the influence of montmorillonite and dolomite for application in plugging and abandonment (P&A) and remedial operations as an alternative material to conventional cementing. The resin compositions were characterized using infrared, with characteristic bands of polyester and styrene monomers being identified in all systems, even with the addition of the thixotropic agent and mineral filler. Compressive strength (CS), rheology, and stability under sedimentation tests were performed. The pure polyester resin showed a CS value above 90 MPa for all curing times. This result is 12 times higher than the minimum required for abandonment operations (7 MPa). All systems presented Newtonian behavior and the addition of 5% dolomite decreased the apparent viscosity. The optimum systems was formulated with 0.1 montmorillonite and 5% dolomite. Based on the results presented, with high compressive strength and low viscosity, the polyester resin proved to be promising for application in well cementing to P&A and remedial operations.

Research paper thumbnail of Evaluation of density influence on resistance to carbonation process in oil well cement slurries

Construction and Building Materials, 2019

h i g h l i g h t s Cement slurries with different densities exposed to CO 2. Investigation of ca... more h i g h l i g h t s Cement slurries with different densities exposed to CO 2. Investigation of carbonation caused by the medium with CO 2. Analysis of the progress of carbonation over time intervals.

Research paper thumbnail of Carbonation in oil well Portland cement: Influence of hydration time prior to contact with CO2

Construction and Building Materials, 2018

h i g h l i g h t s Different scenarios: CO 2 naturally present in rock or artificially injected.... more h i g h l i g h t s Different scenarios: CO 2 naturally present in rock or artificially injected. Exposure to CO 2 and analysis of influence on the cement hydrated previously. Analysis of the progress of carbonation and characterization of the formed phases.

Research paper thumbnail of Effects of carbon dioxide in Portland cement: A relation between static sedimentation and carbonation

Construction and Building Materials, 2017

The carbonation process related with static sedimentation in class G Portland cement slurries. Co... more The carbonation process related with static sedimentation in class G Portland cement slurries. Concepts of fluid mechanics applied in the physical interpretation to cement carbonation process. A model for relating static sedimentation mechanism and carbonation is proposed.

Research paper thumbnail of Alternative Material to be Applied in Oil Well Cementing Subjected to High Temperatures to Avoid Compressive Strength Retrogression

Offshore Technology Conference, 2019

When Portland cement sheath is submitted to temperatures above 110 °C in oil well wellbore condit... more When Portland cement sheath is submitted to temperatures above 110 °C in oil well wellbore conditions, the compressive strength retrogression phenomenon is observed. This occurs due to the conversion of calcium silicate hydrate (C-S-H) to unstable phases, resulting in low compressive strength and high permeability. To minimize that compressive strength issue, guidelines suggests the addition of 35-40% BWOC (By Weight Of Cement) of an extra silica source to balance the relation CaO/SiO2 and convert it into more stable calcium silicate phases. Silica flour (SF) is the silica source worldwide used as anti-strength retrogression agent in cementing operations. The present work presents rice husk ash (RHA) as a sustainable silica source, in alternative to SF, for temperature of the environments where compressive strength retrogression is pronounced. Four compositions of cement slurries were tested: (i) a 15.6 ppg slurry with no silica addition (SF0); (ii) a 15.6 ppg slurry with 35% BWOC o...

Research paper thumbnail of Giant Calculus in the Ureteropelvic Junction: A Case Report

Journal of Medicine, 2014

Urinary lithiasis is an affection of high social impact associated with high costs. Its incidence... more Urinary lithiasis is an affection of high social impact associated with high costs. Its incidence varies from 1 to 15% in the general population and has a recurrence chance of 26-50%. We report one rare case of giant ureteral calculus in the ureteropelvic junction in a patient with complaints of left lumbar pain and recurrent urinary tract infection diagnosed in the outpatients' Urology clinics. Antibioticotherapy was instituted and complementary tests were done. The abdomen x-ray showed a large opacity in the left kidney topography, and the computed tomography evidenced a giant left ureteral calculus associated with a large ureteropelvic junction dilation and grade III hydronephrosis. An ureterolitothomy was performed and evidenced a calculus of 9.5x6.5cm and weighting 347g. The patient became well after the surgery, and a pyelogram evidenced dilation of both caliceal groups and left ureter, without any calculus. Urinary lithiasis should be early diagnosed and treated in order to avoid severe complications as the presented here.

Research paper thumbnail of PROPRIEDADES DINÂMICO-MECÂNICAS DE ELASTÔMEROS TERMOPLÁSTICOS A BASE DE PÓ DE PNEU RECICLADO

The blend of ground tire rubber (GTR), ethylene and 1-octene copolymer (POE) with different octyl... more The blend of ground tire rubber (GTR), ethylene and 1-octene copolymer (POE) with different octylene content (Engage 8003, 8100, 8480) and linear low density polyethylene (LLDPE) was performed by melt-mixing in a corotating twin-screw extruder. The dynamic mechanical results revealed that higher values of elastic modulus were obtained by the addition of GTR, as a function of its rigidity. However, the partial substitution of GTR by POE decreased these values as a consequence of POE elastomeric characteristics. Finally, the tensile properties were considerable improved by adding only 5% of POE to LLDPE/PBP 50/45 blends., suggesting that POE act as a compatibilizer and can actually improve the dispersion of GRT in LLDPE matrix..