Prevention of Shallow Gas Migration Through Cement

Al-Buraik, K.A.; Abdulqader, K. A.; Bsaibes, R.

doi:10.2523/47775-ms

Cited by 3 publications

(1 citation statement)

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“…In addition, CaO and MgO are commonly used as expanders in oil well cementing . Al-Buraik et al investigated the shallow gas migration to the surface and developed a preventive solution by using GASBLOK additive that created an impermeable filter cake across the gas zone and prevented gas migration to the surface . These expandable materials provide very limited expansion to the cement which is not enough to create a strong bonding of the cement with the casing and formation.…”

Section: Introductionmentioning

confidence: 99%

Novel Expandable Cement System for Prevention of Sustained Casing Pressure and Minimization of Lost Circulation

et al. 2021

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Sustained casing pressure (SCP) is a common issue in the oil and gas industry. There were several solutions applied to contain it either by mechanical means or by injecting high-performing cement slurries. There are some limitations associated with these solutions such as volume loss, mechanical failures, limited expansion, exact spotting, and material deterioration with time. In this study, a novel expandable cement system contains a novel silicate aqueous alkali alumino silicate (AAAS) and zinc (Zn) metal slurry, and class G cement is introduced as an expandable solution to prevent annulus flow between the casing and formation. The silicate-based admixture reacts with the Zn metal slurry to generate hydrogen gas that results in the expansion of the cement slurry. The reaction and expansion can be controlled by optimizing the quantities of silicate systems and metal slurry. The expansive properties of the silicate system can be utilized to formulate a cement mix for plugging off the annulus flow. Cement slurries with different percentages such as 3, 5, and 8% by weight of water (BWOW) of AAAS silicate and Zn metal slurry were prepared and tested for their expansion. Several laboratory tests such as expansion, consistency, viscosity, and unconfined compressive strength were performed to assess the percentage expansion. The expansion was tested in the plastic tube as well as in expansion molds. The cement slurries were cured at 50 °C temperature in a water bath. It was observed that metal slurry upon reaction with AAAS silicate resulted in cement expansion by several percentages. The cement expansion was reduced by 16% at 8% BWOW concentration of AAAS silicate as compared to the expansion gained at 3% BWOW concentration. Further, the temperature triggers the expansion of cement slurry. The consistency and viscosity were impacted by the addition of AAAS and metal slurry. The application of expandable slurry can help in preventing the annulus flow and eliminating the safety issues associated with SCP. The expansion solution can be applied in loss circulation zones.

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Section: Introductionmentioning

confidence: 99%

Novel Expandable Cement System for Prevention of Sustained Casing Pressure and Minimization of Lost Circulation

et al. 2021

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Gas and water migration in cement slurries at different curing times

Guo,

Zhang,

Zhang

2024

Geoenergy Science and Engineering

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A Brief Review of Gas Migration in Oilwell Cement Slurries

et al. 2021

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Gas migration in oil and gas wells is defined as gases and/or fluids from adjacent formations invading a freshly cemented annulus. During well completions, gas and/or fluids can migrate to zones with lower pressure or even to the surface. Static gel strength (SGS), related to the yield stress of the cement, is a widely accepted measurement used to predict and minimize gas migration. In this review article, we look at the mechanisms and some possible solutions to gas migration during oil and gas well cementing. The use of static gel strength (SGS) and experimental measurements for SGS and wellbore pressure reduction are discussed. Rheological properties, including the yield stress and the viscosity of cement slurries, are also briefly discussed. Understanding the rheological properties of cement is complex since its material properties depend on cement type, as well as the shape and size distribution of cement particles. From this brief review, it is evident that in order to reduce free water and settling of the cement particles, to lower fluid loss, and to develop compressive strength in the early stages of cementing, an optimal cement slurry design is needed. The SGS test is a standard method used in estimating the free water in the well and could be a reference for gas migration reduction for oilwell cement slurries.

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Prevention of Shallow Gas Migration Through Cement

Cited by 3 publications

References 0 publications

Novel Expandable Cement System for Prevention of Sustained Casing Pressure and Minimization of Lost Circulation

Novel Expandable Cement System for Prevention of Sustained Casing Pressure and Minimization of Lost Circulation

Gas and water migration in cement slurries at different curing times

A Brief Review of Gas Migration in Oilwell Cement Slurries

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