Development and Use of a Gas-Tight Cement

Grinrod, M.; Vassoy, B.; Dingsøyr, E.

doi:10.2523/17258-ms

Proceedings of SPE/IADC Drilling Conference 1988

DOI: 10.2523/17258-ms

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Development and Use of a Gas-Tight Cement

M. Grinrod¹,

B. Vassoy²,

E. Dingsøyr³

Abstract: This paper describes development of a cement slurry composition designed to cope successfully with gas migration problems.The gas blocking effect is obtained by addition of microsilica, a pozzolanic material of extremely fine particle size. Numerous tests have been performed underlaboratory conditions to investigate the phenomena of gas migration through cements, and the corresponding amount of specially selected microsilica needed to effectively prevent gas flow.

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1992

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In-Depth Rheological Evaluation of Gas Tight Cement for Shallow Gas Application

Agista

Khalifeh

Saasen

2022

SPE Asia Pacific Oil &Amp; Gas Conference and Exhibition

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Short-term gas migration during the cementing process has been a challenge in the oil and gas industry. During the curing process, the cement slurry will slowly lose its hydrostatic pressure allowing gas from the formation to enter the annulus. The ideal cement should generate gel structure rapidly after the pumping is finished to hold gas from entering the slurry. Therefore, the rheological properties of cement play a key role in designing reliable gas tight cement. Sets of rheological evaluations were performed on four different zonal isolation materials (neat G cement, geopolymer, gas tight cement, and rapid hardening cement). The cement samples used in the evaluation are industrially used for cementing jobs in the North Sea. The flow rotation and oscillation test were executed at 25°C by using a rheometer. The flow rotation test was performed initially and followed by the oscillation test. In the flow rotation test, the slurry was pre-sheared at 100 1/s for 60 sec, continued ramp-up (0.01-511 1/s) and ramp-down (511-0.01 1/s). The hysteresis area between ramp-up and ramp-down shows the degree of thixotropy of each material. Afterward, an amplitude sweep test was performed at a constant frequency of 10 rad/sec under oscillation movement. The test showed the behavior of materials under a deformation phase. The set of tests measured the storage modulus (G′) and loss modulus (G″) at elevated strain. It also shows the elasticity of the material and its internal strength which could be important parameters for handling the gas invasion. Of four different types of cementitious material, the commonly used gas tight cement had the highest thixotropy and good elasticity compared to other cementitious materials which could explain how it has been widely used for shallow gas cementing. This paper provides an in-depth rheological evaluation of gas tight cementitious material to better understand the importance of rheological parameters for shallow gas and water bearing zones.

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In-Depth Rheological Evaluation of Gas Tight Cement for Shallow Gas Application

Agista

Khalifeh

Saasen

2022

SPE Asia Pacific Oil &Amp; Gas Conference and Exhibition

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Preventing Shallow Gas Migration in Offshore Wells: The Performance of Lead Cements

Coker¹,

Williams

1992

European Petroleum Conference

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Offshore drilling operations that encounter shallow gas formations must consider the potential annular gas flow that may occur following primary cementing. Many specialized cements and procedures have been developed to combat gas migration, but the complexities of gas migration control still challenge operators worldwide. In offshore shallow environments, additional complications can arise with the presence of weak formations and cold temperatures. In such conditions, lightweight lead cements are employed to avoid fracturing the wellbore. Although lead cements are often viewed simply as "filler" materials, shallow gas control slurries must far exceed that role as they become the mechanism to help isolate the movement of gas up the annulus. Presented in this paper is a review of the properties of gas control cementing systems specifically related to lightweight lead slurries. The importance of fluid loss control, rapid gelation, and compressive strength at the time of drillout is stressed. Silica fume cement and newer cementing additives such as colloidal silica and small particle cement are highlighted as means of helping prevent shallow gas migration. Several offshore cementing operations are documented which confirm the success of applying the prescribed designs and methods.

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Development and Use of a Gas-Tight Cement

Cited by 2 publications

References 2 publications

In-Depth Rheological Evaluation of Gas Tight Cement for Shallow Gas Application

In-Depth Rheological Evaluation of Gas Tight Cement for Shallow Gas Application

Preventing Shallow Gas Migration in Offshore Wells: The Performance of Lead Cements

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