Brine Chemistry and Control of Adverse Chemical Reactions with Natural Gas Production. Annual Report March 1988-March 1989

摘要

Co-production is the sponsored concept of attempting to recover a significant fraction of the gas remaining in place after a field has watered out. It requires the production and disposal of large volumes of brine. Three chemistry problems associated with the brine are: scale formation; carbon dioxide corrosion; and solids or turbidity production. Most of the reported work during the previous year has focused on the first two of the problems. Scale has been controlled in the Hitchcock gas field near Galveston, Texas, by injecting inhibitors down 1/4 in. OD stainless steel treat strings. Cost effective 316 SS was used instead of conventional high alloys. Over one hundred thousand dollars was saved on the field alone. It is planned to compare the economics of treat strings with that of inhibitor squeezes. Work has been done on the solubility of calcium inhibitors and the fate of inhibitors in core materials; both of which relate to optimizing inhibitor squeeze design. The use of managed scale control for corrosion inhibition is being studied in the laboratory by examining the dynamics of iron carbonate formation and in the field by injecting phosphate in online slip streams.