scholarly journals Effect of some prepared superplasticizers (Cyclohexanone Based) on compressive strength and physico-chemical properties of oil well cement pastes

2017 ◽  
Vol 26 (3) ◽  
pp. 843-850 ◽  
Author(s):  
I. Aiad ◽  
A.M. Al-Sabagh ◽  
S.H. Shafek ◽  
A.I. Adawy ◽  
S.A. Abo-EL-Enein
Keyword(s):  
Compressive Strength ◽  
Chemical Properties ◽  
Oil Well ◽  
Cement Pastes ◽  
Physico Chemical ◽  
Oil Well Cement ◽  
Well Cement

Carbon Dioxide Corrosion and Corrosion Prevention of Oil Well Cement Paste Matrix in Deep Wells

2014 ◽  
Vol 692 ◽  
pp. 433-438 ◽  
Author(s):  
Jing Fu Zhang ◽  
Jin Long Yang ◽  
Kai Liu ◽  
Bo Wang ◽  
Rui Xue Hou
Keyword(s):  
Carbon Dioxide ◽  
Compressive Strength ◽  
Cement Paste ◽  
Oil Wells ◽  
Oil Well ◽  
Cement Slurry ◽  
Corrosion Prevention ◽  
Oil Well Cement ◽  
Oil Well Cement Paste ◽  
Well Cement

Carbon dioxide CO2could corrode the oil well cement paste matrix under agreeable moisture and pressure condition in deep oil wells, which could decrease the compressive strength and damage the annular seal reliability of cement paste matrix. The problem of oil well cement paste matrix corrosion by CO2was researched in the paper for obtain the feasible corrosion prevention technical measures. The microstructure and compressive strength of corroded cement paste matrix were examined by scanning electron microscopeSEMand strength test instrument etc. under different corrosion conditions. The mechanism and effect law of corrosion on oil well cement paste matrix by CO2were analyzed. And the suitable method to protect CO2corrosion in deep oil wells was explored. The results show that the corrosion mechanism of cement paste matrix by CO2was that the wetting phase CO2could generate chemical reaction with original hydration products produced from cement hydration, which CaCO3were developed and the original composition and microstructure of cement paste matrix were destroyed. The compressive strength of corrosion cement paste matrix always was lower than that of un-corrosion cement paste matrix. The compressive strength of corrosion cement paste matrix decreased with increase of curing temperature and differential pressure. The corroded degree of cement paste matrix was intimately related with the compositions of cement slurry. Developing and design anti-corrosive cement slurry should base on effectively improving the compact degree and original strength of cement paste matrix. The compounding additive R designed in the paper could effectively improve the anti-corrosive ability of cement slurry.

scholarly journals Development and Application of Novel Sodium Silicate Microcapsule-Based Self-Healing Oil Well Cement

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 456 ◽  
Author(s):  
Wenting Mao ◽  
Chrysoula Litina ◽  
Abir Al-Tabbaa
Keyword(s):  
High Temperature ◽  
Sodium Silicate ◽  
Crack Depth ◽  
Oil Well ◽  
Self Healing ◽  
Cement Pastes ◽  
Good Thermal Stability ◽  
Oil Well Cement ◽  
Cement Strength ◽  
Well Cement

A majority of well integrity problems originate from cracks of oil well cement. To address the crack issues, bespoke sodium silicate microcapsules were used in this study for introducing autonomous crack healing ability to oil well cement under high-temperature service conditions at 80 °C. Two types of sodium silicate microcapsule, which differed in their polyurea shell properties, were first evaluated on their suitability for use under the high temperature of 80 °C in the wellbore. Both types of microcapsules showed good thermal stability and survivability during mixing. The microcapsules with a more rigid shell were chosen over microcapsule with a more rubbery shell for further tests on the self-healing efficiency since the former had much less negative effect on the oil well cement strength. It was found that oil well cement itself showed very little healing capability when cured at 80 °C, but the addition of the microcapsules significantly promoted its self-healing performance. After healing for 7 days at 80 °C, the microcapsule-containing cement pastes achieved crack depth reduction up to ~58%, sorptivity coefficient reduction up to ~76%, and flexural strength regain up to ~27%. The microstructure analysis further confirmed the stability of microcapsules and their self-healing reactions upon cracking in the high temperature oil well cement system. These results provide a promising perspective for the development of self-healing microcapsule-based oil well cements.

Mechanical Properties and Microstructure of Epoxy Resin Enhanced Oil-Well Cement Stone

2019 ◽  
Vol 944 ◽  
pp. 1103-1107
Author(s):  
Ming Dan He ◽  
Ming Li ◽  
Yong Jin Yu ◽  
Hao Wang ◽  
Wei Yuan Xiao ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Epoxy Resin ◽  
Performance Testing ◽  
Cement Stone ◽  
Oil Well ◽  
Oil Well Cement ◽  
Waterborne Epoxy ◽  
Waterborne Epoxy Resin ◽  
Well Cement

To adequately understand the waterborne epoxy resin and enhance the compressive, tensile strength of oil-well cement stone, the cement composite materials were prepared with different addition of waterborne epoxy resin, and the specimens were cured for 3days, 7 days, 14days, 28days at 50°C thermostatic water bath to test the compressive strength and tensile strength, respectively. The results showed when the content of resin emulsion is 30%, the compressive strength and tensile strength of the cement are increased by 303.09% and 306.04% compared with pure cement, respectively. Obviously, in the mechanical performance testing, oil-well cement stone modified by waterborne epoxy resin have been significantly improved compared with the pure cement. To explore the enhanced microstructure of oil-well cement modified with waterborne epoxy resin, the cement specimens were prepared with 30% waterborne epoxy resin analyzed by scanning electron microscopy (SEM).

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