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Process for Reducing Iron Sulfide Scales and Preventing Corrosion During the Exploration for and Production of Hydrocarbons

IP.com Disclosure Number: IPCOM000202161D
Publication Date: 2010-Dec-06
Document File: 7 page(s) / 42K

Publishing Venue

The IP.com Prior Art Database

Related People

Marc N. Lehmann: INVENTOR [+4]

Related Documents

OIL4-49859-USP: PATAPP

Abstract

A copolymer of acrolein and ethylene glycol is introduced into a geological formation by means of hydraulic fracturing. The concentration of copolymer within the hydraulic fracturing fluid is about 1%. A baseline concentration of acrolein measured in the production fluid recovered from the oil well. After 24 hours, the acrolein concentration is substantially steady and very gradually decreases over the following six months.

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Process for Reducing Iron Sulfide Scales and Preventing Corrosion During the Exploration for and Production of Hydrocarbons

            Natural gas and crude oil are produced from subterranean geological formations.  In addition to the crude oil, the subterranean geological formations often have sulfur compounds present.  The sulfur compounds, especially hydrogen sulfide and mercaptans, when present in sufficient quantity, render the hydrocarbons produced therefrom “sour.”

One undesirable effect resulting from the presence of such compounds are sulfide scales.  Sulfide scales are commonly described as a group of compounds containing iron in +2 (ferrous) and +3 (ferric) valence states and sulfur in -2 (sulfide) valence states. Examples are ferric sulfide [Fe2S3], ferrous sulfide [

FeS

] and iron disulfide (FeS2, which is found in the minerals marcasite and pyrite). Fe2S3 and FeS2 are insoluble, but

FeS

dissolves in alkaline muds to form a gelatinous solid, Fe(OH)2, and soluble HS-1 and S-2 ions.

FeS

is the primary component in the mineral pyrrhotite, one of many possible sources of sulfides in water mud. Pyrrhotite might also coexist with BaSO4 in some barite ores. Even in trace amounts,

FeS

in a barite supply could generate enough sulfides in a weighted mud system to cause stress-corrosion cracking of drillpipe.

It would be desirable in the art to find additives that may be used to treat to wellbores and geological formations to prevent or at least mitigate the formation of undesirable sulfide scales and the occurrence of corrosion.

Summary of the Invention

            In one aspect, the invention is a process for preventing or mitigating the occurrence of iron sulfide scale during the exploration for and production of hydrocarbons comprising introducing an acrolein polymer and/or copolymer into a hydrocarbon bearing geological formation.

            In another aspect, the invention is a process for preventing or mitigating the occurrence of corrosion in an oil well caused by hydrogen sulfide or other sulfur comprising compounds by introducing an acrolein polymer and/or copolymer into a well bore at a depth where the temperature within the wellbore is too high for the use of acrolein monomer or other hydrogen sulfide scavengers such as triazines.

            In still another aspect, the invention is a process for preventing or mitigating the occurrence of metal sulfide comprising scales, such as

FeS

or ZnS, by introducing an acrolein polymer and/or copolymer into a well bore at a depth where the temperature within the wellbore is too high for the use of acrolein monomer.

            In one embodiment, the invention is a process for preventing or mitigating the occurrence of iron sulfide scale during the exploration for and production of hydrocarbons comprising introducing an acrolein polymer and/or copolymer into a hydrocarbon bearing geological formation.  Acrolein polymer and/or c...