Pumpable geopolymers comprising a fluid-loss agent
The invention concerns the use of a fluid loss control additive in a pumpable geopolymeric suspension for oil and/or gas industry applications, said suspension further comprising an aluminosilicate source, a carrier fluid, and an activator, and method of providing such a suspension in a borehole. In particular, the suspension according to the invention is used for well primary cementing operations and/or remedial applications.
1. A method of using a carbohydrate containing compound as a fluid loss control additive in a pumpable geopolymeric suspension for oil or gas industry applications or both, said suspension further comprising an aluminosilicate source, a carrier fluid, and an activator.
2. The method according to claim 1 , wherein the aluminosilicate source is selected from the group consisting of clays, dehydrated clays, dehydrated kaolins, fly ashes, blast-furnace slags, natural and synthetic zeolites, feldspars, dehydrated feldspars, alumina and silica sols, aluminum silicate or silica ceramic products, and mixtures thereof.
3. The method of claim 2 , wherein the aluminosilicate source is ASTM fly ash class C or fly ash class F.
4. The method of claim 1 , wherein the carrier fluid is selected from the group consisting of fresh water, sea water, brines, re-cycled water or recuperated water, and mixtures thereof.
5. The method of claim 1 , wherein the activator is an alkaline agent.
6. The method according to claim 5 , wherein the activator is a silicate, a metal aluminate, an alkali-metal hydroxide, ammonium hydroxide, an alkaline earth metal hydroxide, or sodium carbonate and mixtures thereof.
7. The method of claim 1 , wherein the activator is an ammonia containing compound.
8. The method of claim 1 , wherein the carbohydrate containing compound is selected from the group consisting of water-soluble polysaccharides.
9. The method of claim 8 , wherein the carbohydrate containing compound is selected from the group consisting of starches, water soluble simple cellulose ethers and water soluble mixed cellulose ethers.
10. The method of claim 1 , wherein the carbohydrate containing compound is efficient in the range of 4° C. to 60° C.
11. The method of claim 1 , wherein the concentration of the carbohydrate containing compound is comprised between 0.5 g/L and 25 g/L of the total volume of the carrier fluid.
12. The method of claim 1 , wherein the suspension is pumped downhole in a oil well, a gas well or both, and sets under downhole conditions.
13. The method according to claim 12 , wherein the suspension is used for primary cementing operations, remedial applications or both.
14. The method according to claim 1 wherein the carbohydrate containing compound comprises starches or carboxymethylcellulose and mixtures thereof.
15. A method of providing a pumpable geopolymeric suspension comprising an aluminosilicate source, a carrier fluid, an activator and a carbohydrate containing compound as a fluid loss control additive, the method comprising a first step consisting of hydrating the fluid loss control additive in the carrier fluid and a second step consisting of adding the activator and the aluminosilicate source.
16. A method of providing a pumpable geopolymeric suspension comprising an aluminosilicate source, a carrier fluid, an activator and a carbohydrate containing compound as a fluid loss control additive, wherein the method comprises a first step consisting of dry-blending the fluid loss control additive, the activator and the aluminosilicate source to make a blend and a second step consisting of adding the blend into the carrier fluid.
17. The method of claim 15 , wherein the activator is an alkaline agent.
18. The method of claim 16 , wherein the activator is an alkaline agent.
19. The method of claim 15 , wherein the concentration of the carbohydrate containing compound is comprised between 0.5 g/L and 25 g/L of the total volume of the carrier fluid.
20. The method of claim 16 , wherein the concentration of the carbohydrate containing compound is comprised between 0.5 g/L and 25 g/L of the total volume of the carrier fluid.