Environmentally acceptable well cement fluid loss control additives, compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorsJan Pieter Vijn, Bach Dao, Mohand Melbouci
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Abstract
Environmentally acceptable well cement fluid loss control additives, cement compositions including the additives and methods of using the compositions are provided. The environmentally acceptable fluid loss control additives are comprised of ethoxylated hydroxyethylcellulose having a reduced molecular weight.
Claims22
An improved environmentally acceptable well cement fluid loss control additive comprising hydroxyethylcellulose having a reduced molecular weight in the range of from about 30,000 to about 90,000 and being ethoxylated in an amount in the range of from about 1 to about 4 moles of ethylene oxide per anhydroglucose unit.
An improved environmentally acceptable well cement fluid loss control additive comprising:
- hydroxyethylcellulose having a reduced molecular weight in the range of from about 30,000 to about 90,000 and being ethoxylated in an amount in the range of from about 1 to about 4 moles of ethylene oxide per anhydroglucose unit;
- and
- a temperature stability increasing agent present in said additive in an amount in the range of from about 50% to about 500% by weight of said ethoxylated hydroxyethylcellulose and selected from the group consisting of synthetic hectorite, magnesium oxide and sodium thiosulfate.
An improved environmentally acceptable well cement fluid loss control additive comprising:
- hydroxyethylcellulose having a reduced molecular weight of about 60,000 and being ethoxylated in an amount in the range of from about 2.5 moles of ethylene oxide per anhydroglucose unit;
- and
- a temperature stability increasing agent present in said additive in an amount of about 100% by weight of said ethoxylated hydroxyethylcellulose and wherein said temperature stability increasing agent is magnesium oxide.
Dependencies are inferred from the claim text.