Effect of the Sodium and Potassium Chloride on the Mechanical and Plastic Properties on the Oil Well Cement Slurries

2012 ◽  
Author(s):  
Camila Aparecida Abelha Rocha ◽  
Cristina Aiex Simão ◽  
Guilherme Chagas Cordeiro ◽  
Romildo Dias Toledo Filho
Keyword(s):  
Mechanical Properties ◽  
Potassium Chloride ◽  
Compression Strength ◽  
Salt Content ◽  
Free Fluid ◽  
Oil Well ◽  
Cement Slurry ◽  
Plastic Properties ◽  
Oil Well Cement ◽  
Well Cement

In recent times, a large reserve of oil and gas in a Pre-Salt zone has been identified in Brazil. In this reserve it is necessary to drill and cement a layer of approximately 2.000 meters of salt rock. In salt rocks, the contact of cement with the rock during the cementing operation can cause the dissolution of the rock and salt can migrate to the cement slurry. Cementitious systems containing salt in their composition have been proposed to minimize the transport of rock salt to the slurry. Considering that the presence of salt can cause changes in the properties of the slurry and compromises the cementing quality. Studies are necessary to understand how the type and concentration of salt can affect the short and long term behavior of the slurry. In this work, the effect of the amount of sodium chloride (NaCl) and potassium chloride (KCl) on the properties of the oil well cement slurry was studied. For this, slurries containing 5%, 10%, 12.5%, 15%, 17.5%, 20% and 36% NaCl by the weight of water (BWOW), and 1%, 3%, 5%, 7%, 10% and 34% KCl (BWOW) were designed. The effect of salt type and content on the rheology, free-fluid and mechanical properties such as compression strength, Young’s modulus, Poisson’s rate and splitting tension strength was investigated. The mechanical properties were evaluated at an age of 8 hours of curing in water at 38°C (100° F) and 60° C (140° F) and 7 days of curing in water at 60° C. The addition of NaCl and KCl resulted in similar behavior in almost all the properties studied. The properties of freshly and early-age, as free-fluid and compression strength, of saline slurry differed in two different mechanisms depending by the salt concentration. For other side, in most cases, the rheological and long-age properties were reduced with an increase in salt content.

Mechanical Properties and Mechanism of Graphite Oxide Reinforced Oil Well Cement

2016 ◽  
Vol 847 ◽  
pp. 445-450 ◽  
Author(s):  
Ming Li ◽  
Fei Meng ◽  
Xiao Yang Guo
Keyword(s):  
Mechanical Properties ◽  
Graphite Oxide ◽  
Complex Stress ◽  
Fluid Loss ◽  
Cement Stone ◽  
Oil Well ◽  
Cement Slurry ◽  
Oil Well Cement ◽  
Reinforced Cement ◽  
Well Cement

The effect of graphite oxide (GO) on the mechanical properties of oil well cement was experimentally studied, in view of the zonal isolation failure due to the brittleness. The microstructure of cement stone was observed by SEM, and the mechanism of graphite oxide reinforced cement stone was also investigated. The result illustrates that the mechanical properties of cement was improved significantly due to the addition of GO. When the GO dosage was 0.05%, the compressive strength, flexural toughness, and splitting tensile strength of cement paste at 7 day age were increased by 61.32%, 15.46% and 145.34% respectively. GO had no bad effect on the application properties of cement slurry, and the stability of the slurry was favorable. Besides, GO could reduce the fluid loss of cement slurry. When GO reinforced cement stone undergoes damage under complex stress, if damage occurs within graphite oxide layer, chemical bonds of GO layers must have been broken, and the force between the layers of GO must be overcome when interlaminar peeling happens, which will lead large amounts of energy consumption as well. The mechanical properties of the cement stone were enhanced by the above two aspects. The research results can provide a theoretical reference for solving the brittle fracture of oil well cement stone.

scholarly journals Hybrid Effect of Wollastonite Fiber and Carbon Fiber on the Mechanical Properties of Oil Well Cement Pastes

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Jianglin Zhu ◽  
Jiangxiong Wei ◽  
Qijun Yu ◽  
Mingbiao Xu ◽  
Yuwei Luo
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Carbon Fiber ◽  
Impact Strength ◽  
Flexural Strength ◽  
Cement Stone ◽  
Oil Well ◽  
Cement Slurry ◽  
Oil Well Cement ◽  
Well Cement

Oil well cement is a type of natural brittle material that cannot be used directly in cementing operations. Fiber is a type of material that can effectively improve the strength and toughness of cement stone, and hybrid fiber materials can more effectively improve the performance of a cement sample. To overcome the natural defects of oil well cement, the new mineral fiber, i.e., wollastonite fiber, and common carbon fiber were used in oil well cement, and the micromorphology, mechanical properties, and stress-strain behavior of the cement were evaluated. The experimental results show that carbon fiber and wollastonite fiber are randomly distributed in the cement paste. The mechanical properties of the cement paste are improved by bridging and pulling out. The compressive strength, flexural strength, and impact strength of cement stone containing only carbon fiber or wollastonite fiber are higher than those of the pure cement, but too many fibers are not conducive to the development of mechanical properties. A mixture of 0.3% carbon fiber with 6% wollastonite fiber in oil well cement slurry results in a greater increase in compressive strength, flexural strength, and impact strength. In addition, compared with blank cement stone, the strain of the mixed cement stone increases substantially, and the elastic modulus decreases by 37.8%. The experimental results supply technical support for the design of a high-performance cement slurry system.

IMPROVING THE QUALITY OF CEMENTING THE PRODUCTION CASING BY OIL WELL CEMENT SLURRY «SILPAN - P» OF GROUP «RAMSINKS - 2M"

2020 ◽  
Vol 5 (2) ◽  
pp. 49-61
Author(s):  
O.I. Nalivaiko ◽  
◽  
L.G., Nalivaiko ◽  
O.L. Melnikov ◽  
A.O. Reznichenko ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oil Well ◽  
Strength Gain ◽  
Cement Slurry ◽  
Corrosion Stability ◽  
Laboratory Conditions ◽  
Oil Well Cement ◽  
Well Cement

In the laboratory conditions results on hydrophobic cement slurry are obtained that significantly improve the properties of existing materials in thermo corrosion stability cement rock, its mechanical properties, provide the estimated density of cement slurry, required rate strength gain.

scholarly journals Study the effect of MgO fineness on Cement slurry and set cement properties

2019 ◽  
Vol 26 (2) ◽  
pp. 156-162
Author(s):  
Yousif Faraj
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Specific Surface ◽  
Oil Wells ◽  
Oil Well ◽  
Cement Slurry ◽  
Weight Percentage ◽  
Oil Well Cement ◽  
Well Cement

This research aims to study the effect of MgO fineness on cement slurry and set cement properties. It has experimentally been found, that adding fine MgO with specific surface (3200 cm2/g) to Portland cement allocated to the Syrian wells by weight percentage (2-4)% gives good mechanical properties to the set cement compared with the course MgO with Specific Surface (2800 cm2/g). Results of this research are useful for improving the quality of oil well cement, and increase the production lifetime of oil wells.

scholarly journals Effect of Epoxy Resin Emulsion on the Mechanical Properties of Oil Well Cement-Based Composites

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Miao He ◽  
Jianjian Song ◽  
Mingbiao Xu ◽  
Lei He ◽  
Peng Xu
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Cement Paste ◽  
Styrene Butadiene Rubber ◽  
Cement Stone ◽  
Oil Well ◽  
Hydration Products ◽  
Cement Slurry ◽  
Oil Well Cement ◽  
Well Cement

Oil well cement is a brittle material, which can not ensure the long-term sealing integrity of oil and gas wells when used in cementing operations directly. As a kind of polymer emulsion material, epoxy resin emulsion has a bright future for improving the properties of the cement slurry. Epoxy resin emulsion was added to oil well cement and its workability and mechanical properties were studied, the stress-strain behavior of cement samples was evaluated, and the microstructure was observed by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show the epoxy resin emulsion used in oil well cement will affect the fluidity, but the rheological property of cement slurry with different content of resin meets the construction requirements. The resin reduces the water loss of cement paste and has no adverse effect on the thickening time. The compressive strength of cement stone decreases with the increase in resin content. When the content of resin is 6%, the flexural strength and impact strength of the cement sample are the largest, and 50.7% and 20.2% higher than that of the specimen without resin, respectively, after curing for 28 days. Further comparison shows that epoxy resin emulsion can improve the mechanical properties of oil well cement better than styrene-butadiene rubber latex. Meanwhile, the resin obviously improves the deformability and decreases the elastic modulus of cement stone. Compared with pure cement, resin cement slurry has no extra hydration products, but the formation of hydrated calcium silicate is inhibited. The microstructure shows that the resin forms a polymer film in the cement matrix and interweaves with cement hydration products, thus improving the flexibility of cement paste.

scholarly journals Thermoplastic Rubber (TPR) Modified by a Silane Coupling Agent and Its Influence on the Mechanical Properties of Oil Well Cement Pastes

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Jianjian Song ◽  
Mingbiao Xu ◽  
Weihong Liu ◽  
Xiaoliang Wang ◽  
Peng Xu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cement Paste ◽  
Silane Coupling Agent ◽  
Cement Stone ◽  
Oil Well ◽  
Cement Slurry ◽  
Oil Well Cement ◽  
Silane Coupling ◽  
Well Cement ◽  
Thermoplastic Rubber

The surface hydrophilicity of thermoplastic rubber (TPR) is poor, and the effect of using it directly in oil well cement is not good. TPR was modified by different silane coupling agents, and the hydrophilicity of the modified TPR was studied by Fourier-transform infrared (FT-IR) spectroscopy and dispersion stability photography. The application effect of modified TPR in oil well cement slurry was also evaluated. The fracture surface morphology of TPR cement stone was observed by macrophotography and scanning electron microscopy (SEM). The results demonstrated that the hydrophilicity of TPR particles was improved after modification with silane coupling agent 3-methacryloxypropyltrimethoxysilane (KH570), and its application effect in cement slurry was excellent. Compared with the pure cement paste, the compressive strength of the cement paste with addition of TPR modified by KH570 was reduced, but the flexural strength and impact strength of the cement paste were effectively enhanced. Moreover, the modified TPR greatly improved the deformation capacity and decreased the elastic modulus of the cement paste. The modified TPR particles formed a plastic polymer network structure in the cement stone and penetrated the cement hydration products, filling in the cement paste to form a flexible structural center. Thus, it improved the mechanical properties and reduced the brittleness of cement paste.

Effect of Fly Ash and Slag on the Resistance to H2S Attack of Oil Well Cement

2009 ◽  
Vol 79-82 ◽  
pp. 71-74
Author(s):  
Qi Wang ◽  
Lin Qiao ◽  
Peng Song
Keyword(s):  
Fly Ash ◽  
Compression Strength ◽  
Blended Cement ◽  
Oil Well ◽  
X Ray Diffraction ◽  
X Ray ◽  
Curing Period ◽  
Oil Well Cement ◽  
Xrd Patterns ◽  
Well Cement

In this paper, the resistance to H2S attack of pastes made from slag-fly ash blended cement used in oil well (SFAOW) was studied, in which fly ash (FA) was used at replacement dosages of 30% to 60% by weight of slag. Samples of SCOW and SFAOW pastes were demoulded and cured by immersion in fresh water with 2 Mp H2S insulfflation under 130oC for 15 days. After this curing period, compression strength and permeability of the samples were investigated. The reaction mechanisms of H2S with the paste were carried out through a microstructure study, which included the use of x-ray diffraction (XRD) patterns and scanning electron microscope (SEM). Based on the obtained data in this study, incorporation of FA into SCOW results in the comparable effects in the resistance to H2S attack. When the replacement dosage of slag is about 40%, the paste exhibits the best performance on resistance to H2S attack with compression strength 36.58Mp.

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