Prevention of Shallow Gas Migration Through Cement

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

doi:10.2118/47775-ms

Cited by 24 publications

(3 citation statements)

References 16 publications

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“…These changes influence the cement matrix compressive strength, promote the evolutions of micro-cracks caused by cement shrinkage under the thermal stresses; therefore, it could increase the cement matrix permeability, and hence, drastically decrease its durability and strength (Shahriar 2011;Ugwu 2008). Al-Buraik et al (1998) discussed the challenges associated with a shallow gas zone located at 400-1000 ft below the surface. After setting the casing and cementation, the gas migrated to the surface indicating that the cement did not hold in place.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the cement quality using polypropylene fiber

Elkatatny

Gajbhiye

Ahmed

et al. 2019

J Petrol Explor Prod Technol

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Durability and long-term integrity of oil well cement are the most important parameters to be considered while designing the cement slurry, especially in the high-pressure and high-temperature (HPHT) environments. In this study, the effect of adding the polypropylene fiber (PPF) to Saudi Class G cement is evaluated under HPHT conditions. The effect of the PPF on the cement compressive and tensile strength, thickening time, density, free water, porosity, and permeability was studied. The effect of the PPF particles on the cement sheath microstructure was studied through powder X-ray diffraction (XRD) and scanning electron microscope. The results obtained showed that PPF did not affect the cement rheology, density, and free water. The addition of PPF considerably decreased the thickening time and improved the tensile and compressive strength of the cement. 0.75% by weight of cement (BWOC) of PPF reduced the thickening time by 75%, from 317 to 78 min. The compressive strength of the cement increased by 17.8% after adding 0.5% BWOC of PPF, while the tensile strength increased by 18% when 0.75% of PPF is used which is attributed to the formation of stable forms of calcium silicate hydrates because of the ability of PPF to accelerate cement hydration process as indicated by the XRD results. The ability of the PPF to decrease the cement thickening time along with its ability to improve the cement strength suggests the use of PPF as an alternative for silica floor in shallow wells where a reduction in thickening time will decrease the wait on cement time. Porosity and permeability of the base cement were also decreased by incorporating PPF because of the pores filling effect of PPF particles as indicated by the microstructure analysis.

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Section: Introductionmentioning

confidence: 99%

Enhancing the cement quality using polypropylene fiber

Elkatatny

Gajbhiye

Ahmed

et al. 2019

J Petrol Explor Prod Technol

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“…Thousands of research and millions of dollars spent on understanding the mechanics of fluid (especially gas) migration and developing solutions, it leads to a wide range of different strategies that describe different aspects of gas migration phenomena [3]. Experimental investigation and case studies to provide practical advice [4][5][6][7], technical solution development [8][9][10][11][12][13], application of different cement additives in cement slurry [14][15][16][17] and prediction technique for cement quality [18][19][20] are number of strategies studied by researchers. All the approaches and strategies utilized to minimize the gas migration risks primarily rely on targeting one or multiple gas migration conditions, including the control of annular pressure decline, reduction of gas entry space, and ultimately minimizing the migration path.…”

Section: Introductionmentioning

confidence: 99%

“…All aspects of gas migration have been discussed in literature. Al-Buraik et al explained about history and experimental aspects of gas migration [7]. Some recommendations and guidelines were represented by Dean and Brennen [24].…”

Section: Introductionmentioning

confidence: 99%

Reduction of fluid migration in well cement slurry using nanoparticles

Bayanak

Zarinabadi

Shahbazi

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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One of the main problems during oil well completion and cementing operation is fluid migration through cement bulk or behind the cemented casing. Slurry composition and characteristic have been focused and improved in last decades to mitigate gas migration and, recently, aspects such as using nanotechnology have been investigated to amend the conditions. In this research, two moderate base slurries with 95 and 120 Pound per Cubic Feet (PCF) densities containing different percentages of nanosilica have been examined using a perfect test package. The results of Fluid Migration Analyzer (FMA) demonstrated that using correct percentage of nanosilica particles modified rheological behavior of the slurries and decreased fluid migration volume. Moreover, adding nanoparticles did not have any negative effects on any conventional parameters. However, static gel strength analyzer showed significant transient time reduction which is an important key in cement setting profile. Triaxial test results together with Mohr circles analyzing presented considerable progress in cement stability and compressive strength.

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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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Prevention of Shallow Gas Migration Through Cement

Cited by 24 publications

References 16 publications

Enhancing the cement quality using polypropylene fiber

Enhancing the cement quality using polypropylene fiber

Reduction of fluid migration in well cement slurry using nanoparticles

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

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