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US 2010/0144559 A1Published application
Kinetic Gas Hydrate Inhibitors in Completion Fluids
AssigneeBaker Hughes Incorporated
InventorsGordon T. Rivers, Jun Tian, John B. Trenery
Life of this patent
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Abstract
Gas hydrate formation in a well completion fluid in the annular space of a hydrocarbon producing well may be controlled by the incorporation of effective amounts of one or more low dose gas hydrate inhibitors, including but not limited to, low dosage hydrate inhibitors (LDHIs), kinetic hydrate inhibitors, dendrimeric or branched compounds, linear polymers and copolymers, grafted or branched linear polymers and copolymers, and onium compounds.
Claims32
A method for inhibiting formation of hydrates comprising:
- contacting a completion fluid including:
- brine;
- and
- hydrate-forming guest molecules that form hydrates at hydrate forming conditions, where the hydrate-forming guest molecule comprises at least one selected from the group consisting of methane, ethane, ethylene, acetylene, propane, propylene, methylacetylene, n-butane, isobutane, 1-butene, trans-2-butene, cis-2-butene, isobutene, butene mixtures, isopentane, pentenes, natural gas, carbon dioxide, hydrogen sulfide, nitrogen, oxygen, argon, krypton, and xenon,
- with an amount of a first hydrate inhibitor comprising a first kinetic hydrate inhibitor (KHI) effective to inhibit formation of hydrates at the hydrate forming conditions, where the first kinetic hydrate inhibitor is selected from the group consisting of grafted linear polymers, branched linear polymers, grafted linear copolymers, branched linear copolymers, copolymers and combinations thereof.
2 more elements
A method for inhibiting formation of hydrates comprising:
- contacting a completion fluid including:
- brine;
- and
- hydrate-forming guest molecules that form hydrates at hydrate forming conditions, where the hydrate-forming guest molecule comprises at least one selected from the group consisting of methane, ethane, ethylene, acetylene, propane, propylene, methylacetylene, n-butane, isobutane, 1-butene, trans-2-butene, cis-2-butene, isobutene, butene mixtures, isopentane, pentenes, natural gas, carbon dioxide, hydrogen sulfide, nitrogen, oxygen, argon, krypton, and xenon,
- with from about 0.01 to about 10 volume % based on the water present of a first hydrate inhibitor comprising a first kinetic hydrate inhibitor (KHI) effective to inhibit formation of hydrates at the hydrate forming conditions, where the first KHI is selected from the group consisting of grafted linear polymers, branched linear polymers, grafted linear copolymers, branched linear copolymers, copolymers and combinations thereof;
- and
- with at least one second hydrate inhibitor selected from the group consisting of:
- up to about 5 wt % based on the completion fluid of a low dose hydrate inhibitor (LDHI);
- up to about 30 wt %, based on the completion fluid, of a thermodynamic hydrate inhibitor (THI);
- an anti-agglomeration (AA) agent;
- another KHI different from the first KHI;
- and
- combinations thereof.
10 more elements
A completion fluid comprising:
- brine,
- hydrate-forming guest molecules, where the hydrate-forming guest molecule comprises at least one selected from the group consisting of methane, ethane, ethylene, acetylene, propane, propylene, methylacetylene, n-butane, isobutane, 1-butene, trans-2-butene, cis-2-butene, isobutene, butene mixtures, isopentane, pentenes, natural gas, carbon dioxide, hydrogen sulfide, nitrogen, oxygen, argon, krypton, and xenon;
- and
- a first hydrate inhibitor comprising a first kinetic hydrate inhibitor (KHI) in an amount effective to inhibit formation of hydrates at hydrate forming conditions, where the kinetic hydrate inhibitor is selected from the group consisting of grafted linear polymers, branched linear polymers, grafted linear copolymers, branched linear copolymers, copolymers and combinations thereof;
- where the completion fluid has less than 0.5 vol % total suspended solids (TSS).
2 more elements
A hydrocarbon well comprising:
- an annular space;
- and
- a solids-free completion fluid in the annular space, the solids-free completion fluid being inhibited against hydrate formation in the presence of water at hydrate forming conditions, and the solids-free completion fluid comprising
- brine;
- hydrate-forming guest molecules, where the hydrate-forming guest molecule comprises at least one selected from the group consisting of methane, ethane, ethylene, acetylene, propane, propylene, methylacetylene, n-butane, isobutane, 1-butene, trans-2-butene, cis-2-butene, isobutene, butene mixtures, isopentane, pentenes, natural gas, carbon dioxide, hydrogen sulfide, nitrogen, oxygen, argon, krypton, and xenon;
- and
- at least a first hydrate inhibitor comprising at least one first kinetic hydrate inhibitor (KHI) in an amount effective to inhibit formation of hydrates at the hydrate forming conditions, where the first KHI is selected from the group consisting of grafted or branched linear polymers and copolymers.
4 more elements
Dependencies are inferred from the claim text.