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New rheological approach helps formulation of gas impermeable cement slurries
The prime tasks of cementing an oil well are to keep the casing in place, to prevent corrosion from formation water, and, most importantly, to avoid the flow of fluids on the outside of the casing. Sometimes gas migration in cement slurries occurs when gas present in the formation exerts pressure against the cement slurry column, causing the formation of microfractures in the setting matrix, especially during the transition time of the slurry. Many studies have been conducted in the last two decades to help in understanding which properties the cement slurry must have to avoid the migration of such fluids. In this paper we propose a new rheological approach to evaluate the capacity of a cement slurry to stop the migration of fluids from the formation in the wells where the risk of gas migration is relatively high, especially during the transition time. Our rheological approach is based on small amplitude oscillatory measurements. We collected information on either kinetics of gelation of cements for oil well usage or the strength of their structures. This fundamental approach has been useful to formulate different cement slurries that have been used with success in several field trials where the risk of gas migration was relatively high.
New rheological approach helps formulation of gas impermeable cement slurries
The prime tasks of cementing an oil well are to keep the casing in place, to prevent corrosion from formation water, and, most importantly, to avoid the flow of fluids on the outside of the casing. Sometimes gas migration in cement slurries occurs when gas present in the formation exerts pressure against the cement slurry column, causing the formation of microfractures in the setting matrix, especially during the transition time of the slurry. Many studies have been conducted in the last two decades to help in understanding which properties the cement slurry must have to avoid the migration of such fluids. In this paper we propose a new rheological approach to evaluate the capacity of a cement slurry to stop the migration of fluids from the formation in the wells where the risk of gas migration is relatively high, especially during the transition time. Our rheological approach is based on small amplitude oscillatory measurements. We collected information on either kinetics of gelation of cements for oil well usage or the strength of their structures. This fundamental approach has been useful to formulate different cement slurries that have been used with success in several field trials where the risk of gas migration was relatively high.
New rheological approach helps formulation of gas impermeable cement slurries
Calloni, G. (author) / D'Antona, P. (author) / Moroni, N. (author)
Cement and Concrete Research ; 29 ; 523-526
1999
4 Seiten, 6 Quellen
Article (Journal)
English
A new rheological approach helps formulation of gas impermeable cement slurries
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