Pumpable geopolymer cement
AssigneePetroliam Nasional Berhad
InventorSiti Humairah Abd Rahman
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Abstract
This invention relates to an adaptable Geopolymer cement composition for application in oil and gas wells having a wide range of downhole temperatures. The base Geopolymer cement composition has an acceptable rheology of below 200 cP and can be tailored by the inclusion of various chemicals to control properties such as thickening time over a wide range of temperatures and densities. The disclosed Geopolymer cement composition is pumpable, mixable and stable. The composition can also be adapted to have expandable and swellable properties.
Claims19
A pumpable geopolymer cement composition comprising:
- an aluminosilicate source material;
- an alkaline solution comprising a carrier fluid, an alkaline activator material and a silicate material, wherein, the weight:weight ratio of the alkaline solution:aluminosilicate source material is from 0.1 to 2:1, and the weight:weight ratio of the silicate material:alkaline solution is from 0.15 to 1:1,
- wherein the composition further comprises a swellable material in an amount of from 10 to 60 wt % relative to the total weight of aluminosilicate source material in the composition.
A method of forming a pumpable geopolymer cement formulation comprising the steps of:
- (a) mixing a carrier fluid with an alkaline activator material to form a first mixture;
- (b) adding a silicate material to the first mixture of step (a) and mixing to form a second mixture;
- and
- (c) adding an aluminosilicate material to the second mixture of step (b) and mixing,
- wherein any one of steps (a) to (c) further comprises adding a swellable material in an amount of from 10 to 60 wt % relative to the total weight of aluminosilicate source material in the formulation.
Dependencies are inferred from the claim text.