Optimum Practices to Mitigate Gas Migration Problems in Deep Gas Wells (Russian)

Al-Yami, Abdullah; Mukherjee, Tushar S.; Riskiawan, Arris; Wagle, Vikrant

doi:10.2118/187700-ru

Cited by 5 publications

(3 citation statements)

References 9 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%

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%

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

et al. 2020

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“…2 is quite high at the varying temperatures, the varying temperature and pressures also shows that transit time keeps increasing to up to 1 hour, this time would expose the cement slurry after placement to formation pressures which could destabilize the slurry causing micro annuli and channeling leading to need for remedial cement job to be done after a cement bond log has been conducted [8][9][10].…”

Section: Discussionmentioning

confidence: 99%

Effect of Silica Flour and Potasium Chloride as Additives in the Rhelogical Properties of High Temperature High Pressure Gas Well Cement Slurry

Roli,

Joel,

John

2023

JERR

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This study explores the effects of silica flour and potassium chloride on the rheological properties of high temperature and pressure gas wells. Seven different materials were used as additives which includes: fresh water, dyckerhoff, silica flour, antifoam, extender, fluid loss, dispersant, retarder, anti-settling agent, gas control agent, dry viscosifier, potassium chloride and accelerator. Four recipes were prepared using these additives in different mixtures. Recipe four has all the additives including silica flour and potassium chloride. A series of flow tests was performed using an advanced shear-stress/shear strain controlled rheometer. Rheological properties of cement slurries were calculated from the resulting flow curves using the Bingham plastic model and the Herschel–Bulkley’s model. Changes in shear stress–shear rate relationships, yield stress, plastic viscosity, and shear thinning/thickening behavior were found to be related to temperature and the type and dosage of supplementary cementitious material. The four recipes were applied in 10 cases.Among the four different recipes tested for all the 10 cases, Recipe 4 has the best regression values for both temperature vs transit time and pressure vs transit time this can be attributed to the presence of silica flour and potassium chloride.

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“…The plotted chart pertains to the compressive strength of the cement sheath at two static temperatures.Another important property that the Cement slurry must possess is controlling gas migration. To control gas migration, designed cement slurries should have several characteristics, including: Controlling fluid loss, preventing slurry settling, maintaining zero free water, avoiding cement contraction, and reducing the transition time (Al-Yami et al21 ).The proposed formulation, by controlling fluid loss, settling, maintaining a zero-free water level, and reducing the transition time, can prevent the infiltration of formation fluids into the slurry.…”

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confidence: 99%

A new combination of ether and ester as FLC with a liquid dispersant for decreasing the transition time and optimization of fluid loss and rheological properties of fresh cement slurry

Khazaei,

Dehvedar

2024

Preprint

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Fluid loss causes the rheological properties and mechanical properties of the slurry to change completely. Therefore, fluid loss proves that the slurry cannot have proper properties. In this study, the effect of several types of FLC (Fluid loss control) and a liquid dispersant on the fresh cement slurries are considered. the change in rheological properties, compressive strength, Fluid loss control, free water, settling, mixing time, and thickening time were investigated. Also, a challenging issue during well cementing in the oil well is fluid migration from the pumped cement into the permeable formation. Excessive fluid loss can create space for gas entry into the cement slurry, hence fluid loss control additives are also utilized to reduce gas migration. The cement slurry weight was 118 pcf used in 13 3/8” casing and 7” liners. An FLC composed of two substances (including ester-ether) was selected after examining materials with amide, ester, ether, alcoholic, and carboxylic acid functional groups. The ultimate recommendation introduced a combination of three substances (FLC1+FLC2+Liquid Dispersant) as proposed materials for controlling the mentioned properties in the slurry of fresh cement at 180℉ and 210℉ for compressive strength and 150 ℉ and 180 ℉ for BHCT slurry characteristics. The designed formulation using these additives leads to a reduction in transition time. The reduction in transition time plays a significant role in decreasing gas migration into the cement slurry.

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Optimum Practices to Mitigate Gas Migration Problems in Deep Gas Wells (Russian)

Cited by 5 publications

References 9 publications

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

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

Effect of Silica Flour and Potasium Chloride as Additives in the Rhelogical Properties of High Temperature High Pressure Gas Well Cement Slurry

A new combination of ether and ester as FLC with a liquid dispersant for decreasing the transition time and optimization of fluid loss and rheological properties of fresh cement slurry

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