7 Special Cement Systems

Nelson, Erik B.; Drecq, P.

doi:10.1016/s0376-7361(09)70305-x

Cited by 6 publications

(9 citation statements)

References 29 publications

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“…Freezeback is another identified problem, and occurs when drilling or cementing operations pass through regions of thick permafrost. A conventionally cemented well is likely to thaw these permafrost regions, with the thaw zone extending as far as a meter or more beyond the boundary of the wellbore (Nelson and Drecq, 2001). Casing collapse is a serious concern in cold regions if no preventative steps are taken.…”

Section: Definition Of the Problem And General Temperature Limitationsmentioning

confidence: 99%

“…However, the network is easily subjected to disruption by the heat of produced and/or drilling fluids, as well as by seasonal temperature changes. Upon sufficient heating, the ice network is disturbed and the effective permeability of the set product rapidly increases (Nelson and Drecq, 2001). …”

Section: Definition Of the Problem And General Temperature Limitationsmentioning

confidence: 99%

“…This process ultimately leads to a decrease in effective porosity, but the ice network can be easily disrupted by heat; therefore, a frozen cement wellbore is very likely to experience future problems with oil and gas migration and loss of well integrity (Nelson and Drecq, 2001). …”

Section: Problems Associated With Conventional Cementsmentioning

confidence: 99%

“…However, one trend remained consistent across all the additives that were used: in quantities necessary to prevent the freezing of the slurry water, additives had a side-effect of making the set cement product weak to the point of uselessness. Thus, the use of additives has been abandoned as a primary solution to the freezing problem, and additives are used only in conjunction with other freeze-prevention methods, such as specialty extended permafrost systems (Nelson and Drecq, 2001). …”

Section: The Use Of Freeze-depressing Additivesmentioning

confidence: 99%

“…The highaluminate cements contain no free lime and none is produced upon hydration, as is the case with the American Petroleum Institute (API) classes of cement; therefore, adding fly ash or pozzolans creates only diluents and no cementitious reaction occurs (Smith, 1986). Temperatures (Nelson and Drecq, 2001) As shown in Figure 3, high-aluminate cements will set and gain strength rapidly at low temperatures, reaching about 95 percent of the ultimate strength in 24 hours. These cements exhibit a high heat of hydration, and since the hydration reaction occurs rapidly, high cement-column temperatures may occur.…”

Section: High-aluminate Cementsmentioning

confidence: 99%

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Novel Chemically-Bonded Phosphate Ceramic Borehole Sealants (Ceramicretes) for Arctic Environments

Patil¹,

Chukwu²,

Chen³

et al. 2008

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UAF is an affirmative action/equal opportunity employer and educational institution iii DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product,

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Section: Definition Of the Problem And General Temperature Limitationsmentioning

confidence: 99%

Section: Definition Of the Problem And General Temperature Limitationsmentioning

confidence: 99%

Section: Problems Associated With Conventional Cementsmentioning

confidence: 99%

Section: The Use Of Freeze-depressing Additivesmentioning

confidence: 99%

Section: High-aluminate Cementsmentioning

confidence: 99%

See 3 more Smart Citations

Novel Chemically-Bonded Phosphate Ceramic Borehole Sealants (Ceramicretes) for Arctic Environments

Patil¹,

Chukwu²,

Chen³

et al. 2008

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Study the problem of loss circulation of cement slurries in “Abo-Rabah” field of Syria by using special cement slurries

Khaddour¹

2023

CONFERENCE PROCEEDINGS OF THE FIRST VIRTUAL CONFERENCE OF AL-AMARAH UNIVERSITY COLLEGE ON OIL AND GAS-2022: AUCOGC2022 Conferen

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Cellular automaton simulations of cement hydration and microstructure development

Bentz

Coveney

Garboczi

et al. 1994

Modelling Simul. Mater. Sci. Eng.

100

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Cellular automaton algorithms, which operate on a starting digital image of a water-cement suspension, are described. The algorithms simulate the microstructure development process due to hydration reactions that occurs between cement and water. This paper describes the evolution of the cement model from a simple model, which treated the cement particles as single-phase materials, with a greatly simplified hydration chemistry, into a model which has many more chemical species and includes numerous reactions which eventually convert the viscous water-cement suspension into a rigid porous solid. Methods are presented for generating two- and three-dimensional images representing suspension initial conditions; these are derived from both micrographs of real cements and computer-based algorithms. The 2D initial images are based on the processing of backscattered electron and x-ray images of real cement suspensions. The 3D images employ either spheres to represent cement particles, or more realistic randomly shaped particles via an algorithm which smooths and thresholds a 3D lattice whose sites are initially populated with random white noise. A convenient measure of the point at which the initial paste turns into a solid material is the percolation threshold of the solids. Consideration of these models has already led to the prediction and subsequent experimental observation of a sharply defined onset of shear wave propagation, from ultrasonic measurements through hydrating cement slurries. The amount of hydration needed to reach the percolation threshold can be determined in the present simulations, and our results are compared with time of shear wave onset in actual cement slurries. Variants of the basic model provide insight into both early-time behaviour that is of primary interest to oil well cementing and the later-time microstructural properties that are of interest in the construction industry.

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7 Special Cement Systems

Cited by 6 publications

References 29 publications

Novel Chemically-Bonded Phosphate Ceramic Borehole Sealants (Ceramicretes) for Arctic Environments

Novel Chemically-Bonded Phosphate Ceramic Borehole Sealants (Ceramicretes) for Arctic Environments

Study the problem of loss circulation of cement slurries in “Abo-Rabah” field of Syria by using special cement slurries

Cellular automaton simulations of cement hydration and microstructure development

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