I am looking for oil and gas pipeline data for the area near Parnaiba, Brazil. I've spent hours search the web and I have yet to locate a source. Does anyone have any suggestions?
I suppose this depends your requirements regarding spatial accuracy. A very general guide to pipeline location could be: http://www.theodora.com/pipelines
If you are looking for something up-to-date and with a better degree of accuracy you will always have to contact the country regulator/government as pipelines are major infrastructure investments that therefore have a degree of security and control about them.
Contact ANP: National Petroleum Agency (Agência Nacional de Petróleo, Gás Natural e Biocombustíveis) as suggested by @blord-castillo - http://www.anp.gov.br/