Effects of Nano Silica on oil well cement slurry charactreistics and control of gas channeling

Bayanak, Mahmoud; Zarinabadi, Soroush; Shahbazi, Khalil; Azimi, Alireza

doi:10.1016/j.sajce.2020.05.006

Cited by 13 publications

(12 citation statements)

References 15 publications

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“…Therefore, to prevent or mitigate this gas migration, it is recommended to reduce the amount of slurry fluid loss by increasing the used fluid loss additive. Another way for mitigating the gas migration is using expansion additives for better bonding of cement in the contact area of cement-casing and cement-formation or using nanoparticles such as nanosilica to prevent gas migration. , Also, a combination of hematite and Micromax (manganese tetroxide) with expansion additives and silica flour could greatly reduce the amount of gas migration as explained by Al-Yami and Al-Humaidi …”

Section: Resultsmentioning

confidence: 99%

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Influence of Weighting Materials on the Properties of Oil-Well Cement

et al. 2020

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The integrity of oil and gas wells is largely dependent on the cement job. Maintaining the properties of the cement layer throughout the life of a well is a difficult task, particularly in high-temperature and -pressure conditions such as those in deep wells. Cementing deep wells require slurries with high densities. Heavyweight cement systems are those designed with weighting materials. These materials have a higher specific gravity in comparison to cement. The purpose of this work is to investigate the influence of weighting materials on the properties of Class G oil-well cement and to make necessary recommendations for their use. The rheology, fluid loss, gas migration, and dynamic elastic properties of three cement slurries containing different weighting materials, namely, hematite, barite, and ilmenite, were studied. The results indicate that cement slurry designed with barite exhibits the best rheological behavior that would provide a perfect solution for deep wells where cement placement is a concern. The barite slurry had the lowest plastic viscosity. The plastic viscosity of the hematite and ilmenite-weighted systems was higher by 11.5 and 12.4%, respectively. The barite-based slurry also had the highest yield point of 84.3 lb f /100 ft 2 , whereas the yield points of hematite and barite cement were 37.9 and 29.5 lb f /100 ft 2 , respectively. Furthermore, the gel strengths of barite cement were the highest, with 10 s and 10 min gel strengths of 11.5 and 39.5 lb f /100 ft 2 , respectively. Ilmenite had the most positive impact on fluid loss control, which would be appropriate in high permeable formations. It had a fluid loss of 66 mL/30 min, lower than those of the hematite (80 mL/30 min) and barite (82 mL/30 min) systems. Furthermore, the best dynamic elastic properties were exhibited by the ilmenite system, with the smallest Young’s modulus (27.3 GPa) and the highest Poisson ratio (0.252). This would make the ilmenite to be very useful in developing heavyweight cement composites that could withstand severe external loads imposed on the casing and cement. The hematite cement was the most impermeable to gas migration, with a gas volume of 127.8 cm 3 , whereas the volume measured in the barite and ilmenite systems were 20.9 and 78% higher, respectively. This makes the hematite to be very useful in deep gas wells where gas migration control is important.

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Section: Resultsmentioning

confidence: 99%

“…The three cement slurries were prepared based on the procedure of the American Petroleum Institute. , First, Class G cement was dry-mixed with silica flour and the weighting material. Then, the water was placed in the mixer and the additives were added one by one.…”

Section: Materials and Methodologymentioning

confidence: 99%

Influence of Weighting Materials on the Properties of Oil-Well Cement

et al. 2020

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“…As the particles fill the voids between cement particles, it would provide additional nucleation sites for hydration and create CSH phases [102]. Thus, the resulting volume expansion may be comparatively larger.…”

Section: Additives For Further Development Of Sremamentioning

confidence: 99%

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

Liyanage

Ranjith

2021

Energies

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This review provides the hydration and volume expansion mechanism of expansive materials, with the goal of utilizing them in the development of sustainable mining methods. The main focus of the review will be the newly developed non-destructible rock fragmentation method, slow releasing energy material agent (SREMA), which is a modified soundless chemical demolition agent (SCDA). The review aims to address one of the main gaps in studies related to SREMA, by presenting a thorough understanding of the components of SREMA and their mechanisms of action, leading to volume expansion. Thus, this review would act as a guide for researchers working on using expansive materials for rock breaking. As many literatures have not been published regarding the recently discovered SREMA, studies on cements, expansive cements, and soundless chemical demolition agents (SCDA) were mainly considered. The chemical reactions and volume expansive processes of these materials have been studied and incorporated with the additives included in SREMA, to understand its behavior. Literature containing experimental studies analyzing the heat of hydration and microstructural changes have been mostly considered along with some of the heavily discussed hypotheses regarding the hydration of certain components, to predict the volume expansive mechanism of SREMA. Studies related to SREMA and other similar materials have shown drastic changes in the heats of hydration as the composition varies. Thus, SREMA has the capability of giving a wider range of expansive energies in diverse environmental conditions

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“…Annulus compression zone and gas channeling are challenging (Bu et al, 2016;Zhao et al, 2018;Zeng et al, 2019;Bu et al, 2020a;Bayanak et al, 2020) problems in the development and production of oil and gas wells because cement rings are subjected to casing internal pressure (Bu et al, 2020b;Guo et al, 2020;Kuanhai et al, 2020;Kuanhai et al, 2021) and formation stress (Su et al, 2022). The failure of its mechanical integrity (Wang and Taleghani, 2014;Omosebi et al, 2017) leads to damage, cracks, and the appearance of microannular gaps on the cemented surface, yielding annulus packing failure (Yousuf et al, 2021), introducing enormous safety hazards to the later exploitation of oil and gas wells.…”

Section: Introductionmentioning

confidence: 99%

Research on the Mechanical Integrity of Low-Density Cement Mortar

Xie¹,

Cheng

et al. 2022

Front. Mater.

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Poor mechanical integrity of cement sheaths during the production of oil and gas wells may cause air channeling and water channeling issues in the wells, leading to severe safety problems, and adversely affecting the safety and efficiency of the oil and gas resources production. This article focuses on a low-density cement slurry system with added floating beads. The compressive strength and flexural strength of cement stones, the mechanical integrity of cement rings, and triaxial mechanical properties were assessed. The optimal dosage of floating beads and the evolution of the cement stone’s mechanical properties and deformation ability were discussed. Bonding strengths of the first and the second interfaces were evaluated using the shrinkage test results of the cement mortar. Finally, the microscopic mechanism of the change in mechanical properties was analyzed by scanning electron microscopy. The results showed that the cement mortar exhibited the best compressive strength, mechanical integrity, and deformability after blending with 15% floating beads. At the same time, the volume shrinkage of the cement mortar mixed with 15% floating beads was the smallest, only 0.00667%, plausibly indicating good bonding with a casing and the formation to reduce the occurrence of gas channeling. Finally, the microscopic test of the cement mortar showed that the bonding between floating beads and cement was not tight, so internal cracks in the cement easily developed along the bonding part of cement and floating beads. The more floating beads were mixed, the more likely was cement mortar destroyed.

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Effects of Nano Silica on oil well cement slurry charactreistics and control of gas channeling

Cited by 13 publications

References 15 publications

Influence of Weighting Materials on the Properties of Oil-Well Cement

Influence of Weighting Materials on the Properties of Oil-Well Cement

The Hydration and Volume Expansion Mechanisms of Modified Expansive Cements for Sustainable In-Situ Rock Fragmentation: A Review

Research on the Mechanical Integrity of Low-Density Cement Mortar

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