As of January 1, 2017, Petroleum Field Services is rebranded as Ascent Geomatics Solutions. Please visit our new business page on LinkedIn: Ascent Geomatics Solutions. Petroleum Field Services is the leading field service provider in the energy industry. PFS is a locally owned and operated company with our headquarters in Denver and satellite offices in Texas, North Dakota, and Wyoming. We offer a variety of services including: Asset Management, GIS Mapping, Permitting & Compliance, Surveying, Engineering, and Environmental Services. We pride ourselves in offering the best solutions for our clients which include: utilizing top-quality technology and providing customers with precision, timeliness, and excellent customer service.