Abstract

Gas shortages, inflated pipeline replacement costs, and gas losses caused by internal corrosion have caused gas gathering and storage companies to become very concerned about internal corrosion in pipelines. Gathering systems take gas of pipelines. Gathering systems take gas of lower quality now more than ever before. Storage systems are pulled harder and longer, thus, more corrosive liquids are produced on withdrawal. The need exists for a specialized internal corrosion control program for gas handling systems. A program has been developed that includes detection of internal corrosion, treatment and monitoring of treatment results.

The energy shortage of recent months has helped focus attention to the internal corrosion problems in gas pipeline systems. However, internal corrosion and treatment in gas gathering systems has been documented since the early 1950's. This early treating program was accomplished by using an oil soluble water dispersible corrosion inhibitor. Application was by slug treatment and later as an inhibitor mist. Although the inhibitor program was successful in controlling corrosion, side effects such as sludge and emulsions occurred.

Internal corrosion in gathering systems is caused by acid gases in water and usually occurs along the bottom and sides of the line. In low flow systems where gas production has declined, corrosion and failures production has declined, corrosion and failures can take place on the upper surfaces of the pipeline. pipeline. In gas storage systems, the traditional treatment is with biocide and/or corrosion inhibitor. The chemical is mixed with water or a suitable solvent, pumped into the storage well and followed with gas. This method assumes the gas will displace the chemical mixture into the formation to control bacterial growth. Although negative bacteria cultures have been noted with this type of treatment there is concern that the biocide stayed in the bottom of the well or near the well bore and was not carried far into the formation where bacterial growth still continues.

Side effects of biocide treatments are foaming, emulsions, and expensive equipment costs for individual well treatments.

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