High temperature gravel packing fluid system
AssigneeSchlumberger Technology Corporation
InventorsTint Htoo Aung, Balkrishna Gadiyar, Juan-Carlos Santamaria, Cedric Manzoleloua, Hui Zhang, Edward Derkach, Christopher Daeffler
Life of this patent
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Abstract
A high density carrier fluid for use in placing a gravel pack within a wellbore includes a modified starch, a magnesium oxide, and a nano-crystalline-cellulose having a median diameter of about 20 nanometers or less. The carrier fluid includes an aqueous base fluid and dissolved salts. Related methods include methods of making and using the carrier fluids.
Claims20
A composition for use in placing a gravel pack within a wellbore, the composition comprising:
- a modified starch having a concentration between about 5 pounds per barrel (ppb) and about 15 ppb;
- magnesium oxide;
- a nano-crystalline-cellulose having a median diameter of about 20 nanometers or less, the nano-crystalline-cellulose having a concentration between about 0.5 ppb and about 12 ppb;
- an aqueous carrier fluid including at least one salt, wherein the at least one salt includes two or more of calcium chloride, calcium bromide, or zinc bromide;
- and
- gravel having a concentration between about 0.5 pounds per gallon and about 10 pounds per gallon.
A method of preparing a slurry for a gravel packing fluid, the method comprising:
- obtaining a modified starch, a magnesium oxide, a nano-crystalline-cellulose having a median diameter of about 20 nanometers or less, and a carrier fluid, the carrier fluid comprising an aqueous base fluid and at least one salt, wherein the at least one salt includes two or more of calcium chloride, calcium bromide, or zine bromide;
- mixing the modified starch, the magnesium oxide, and the nano-crystalline-cellulose into the carrier fluid to form the slurry, the modified starch having a concentration between about 5 pounds per barrel (ppb) and about 15 ppb and the nano-crystalline cellulose having a concentration between about 0.5 ppb and about 12 ppb;
- and
- suspending particles in the slurry, the particles including gravel having a concentration between about 0.5 pounds per gallon and about 10 pounds per gallon.
A method of placing a gravel pack in a formation, the method comprising:
- providing slurry including a carrier fluid and particles suspended in the carrier fluid, the carrier fluid comprising a modified starch, a magnesium oxide, a nano-crystalline-cellulose having a median diameter of about 20 nanometers or less, and a base fluid, the base fluid comprising at least one salt and one or more of a water, sea water, or aqueous solution, wherein the at least one salt includes at least two of calcium chloride, calcium bromide, or zinc bromide, and wherein the modified starch has a concentration between about 5 pounds per barrel (ppb) and about 15 ppb, the nano-crystalline-cellulose has a concentration between about 0.5 ppb and about 12 ppb, and the particles include gravel having a concentration between about 0.5 pounds per gallon and about 10 pounds per gallon;
- and
- placing the slurry within the formation to create a gravel pack.
Dependencies are inferred from the claim text.