Banca de DEFESA: DENNYS SALVINO SERGIO PEREIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : DENNYS SALVINO SERGIO PEREIRA
DATE: 12/12/2019
TIME: 14:00
LOCAL: Núcleo Tecnológico de cimentação em poços de petróleo - LabCim
TITLE:

SYSTEMS DEVELOPMENT BASED TO CALCIUM SULPHATE TO APPLICATION IN OIL WELLS CEMENTING

KEY WORDS:

Calcium Sulfate, Portland Cement, Rice Husk Ash, Oilwell, Cementing oilwell

PAGES: 85
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SPECIALTY: Não-Metais e Seus Compostos
SUMMARY:

The Portland Cement (PC) production is directly linked to different environmental impacts. Those impacts are associated with different extraction phases going from the raw material stage to the clinquerization stage, having the emission of large volumes of CO₂ and very high energy utilized. The search to alternative cement materials may have similar technological properties and with less aggression to the environment, has become the target of several segments to Portland Cement industry. Calcium sulfate hemi-hydrate (HH) is a binder with reduced environmental impacts linked to both its production and use, presented as a less aggressive material to the environment. Calcium sulfate systems can be used both in their pure form and can have their properties improved upon partial replacement by Portland cement and other materials can also be used as an agent of pozzolanic activity, as a Rice Husk Ash (RHA). This paper is aimed to develop and analyze systems based on pure calcium sulfate and with the addition of Portland Cement and Rice Husk Ash (RHA), as an alternative to the formulations used in the initial stages of cementation of wells of Petroleum. For the development of this study, slurrys with water/gypsum factors (FAGs) between 0.5-0.6 were prepared, being submitted to different cures ages (24 hours, 7 and 28 days) and temperatures (27, 38 and 60 ºC). The slurrys were aditived using a handle retarder (sodium tetraborate) and superplasticizer (polycarboxylate), in order to obtain the technological properties required for application in the petroleum industry. These formulations were evaluated through tests of compressive strength, rheological parameters and permeability, besides the use of thermal characterization techniques (TG / DTG), X-ray diffraction (XRD), scanning electron microscopy (SEM-EDS) HH and its formulations with CCA and CPP. The results showed that the system based on pure calcium sulfate type HH-α and HH-β with 30% substitution for CCA and cement, present satisfactory results of compressive strength, approximately 13% higher than the formulation with CPP, traditionally used in cementing operations, with higher values, compared to the PC formulation traditionally used in cementing operations. The systems presented technological properties applicable in well cementation operations with depths ranging from 500-1000m, considering a geothermal gradient of 1.7 F / 100ft. In addition, the cost of HH is on average 60-70% cheaper than the current CPP.

BANKING MEMBERS:
Externo à Instituição - BRUNO LEONARDO DE SENA COSTA - UFRN
Presidente - 1804366 - JÚLIO CÉZAR DE OLIVEIRA FREITAS
Externo ao Programa - 1754344 - MARCOS ALLYSON FELIPE RODRIGUES
Interno - 1859346 - MIGUEL ANGELO FONSECA DE SOUZA
Externo à Instituição - RODRIGO CÉSAR SANTIAGO - UFERSA