Cement compositions containing phyllosilicate and methods of use
AssigneeKing Fahd University of Petroleum and Minerals
InventorsSalaheldin Elkatatny, Ahmed Abdulhamid Mahmoud, Abdulmalek Ahmed
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Abstract
Cement compositions containing a hydraulic cement, a synthetic phyllosilicate (e.g. Laponite®), and silica flour. The cement compositions may optionally include other additives such as an expandable agent, a defoamer, and a fluid loss controller. Cement slurries and wellbore cements made therefrom are also specified. The inclusion of the synthetic phyllosilicate has enhanced the mechanical strength, improved the density homogeneity, as well as decreased the permeability of the wellbore cement, making it suitable for cementing oil and gas wells under high pressure and high temperature (HPHT) conditions.
Claims16
A cement composition, comprising:
- a hydraulic cement;
- silica flour;
- a defoamer:
- an expandable agent;
- a fluid loss controller;
- and
- from 0.1 to 0.5 wt % (BWOC) of a synthetic phyllosilicate comprising SiO2, MgO, and Li2O,
- wherein:
- a weight ratio of the hydraulic cement to the synthetic phyllosilicate is from 200:1 to 1,000:1,
- a combined weight of SiO2 and MgO is 80-95 wt % of a total weight of the synthetic phyllosilicate;
- and
- the synthetic phyllosilicate has a weight ratio of SiO2 to MgO in a range of 3:2 to 7:2.
Dependencies are inferred from the claim text.