Manufacturing Jobs

Who We Are

SEF Energy, established in 2014, is a private holding company comprised of US-based manufacturing companies, Downing Wellhead and Oso Perforating.  We have over 40 years of experience in the energy industry and our roots run deep in Oklahoma.  Our mission is to create a culture of excellence, to provide a meaningful work experience for employees and to facilitate the provision of energy to the world. We do this through our key commitments and following our core values.

Our Companies

For 40 years, Downing has specialized in designing and manufacturing quality, reliable wellhead and surface equipment right here in the U.S.A.  We are proud to be an API-6A licensed manufacturer and work hard to provide the best wellhead and surface equipment to our customers.

Oso Perforating is a downhole tool provider specializing in perforating technology. We design and manufacture high-quality perforating products and ancillary equipment. We take pride in providing our customers with industry leading completion tools that are innovative while cost-effective. Our manufacturing capacity coupled with our technical prowess allows us to be highly responsive to our customers.

Our Core Values

Returns Driven

We will ensure that capital is deployed toward the highest return projects and exceeds our cost of capital


We will collectively and individually hold ourselves accountable for our performance


We will be nimble in our processes and adjust rapidly but prudently to the changes in our industry


We will be honest and forthright in our dealings with all stakeholders of the company


We will have a commercial focus that permeates every decision and every aspect of our business


We will be rigorous and disciplined in our cost management


We will view ourselves as servant-leaders who place greater emphasis on the success of the company than individual recognition

What We Manufacture

At our U.S. based manufacturing facility in Oklahoma City, we manufacture casing and tubing heads, casing and tubing hangers, adapters, valves, flanges and other pressure control and casing suspension equipment for Downing Wellhead. For Oso Perforating, we manufacture a high volume of charge tubes, perforating gun bodies and subs, as well as assemble the perforating guns

Our Facility

Our Oklahoma City headquarters features a 100,000 square foot, state-of-the-art, climate-controlled facility manufacturing products for both Downing Wellhead and Oso Perforating.  Our organized and clean shop features modern CNC machine tools, measuring and testing equipment.

Take a glimpse inside our facility!  We were featured on Fox Business Network’s Manufacturing Marvels!

We Want You

We hire CNC Machinists, CNC Operators, Assembly/Test Technicians, Quality Inspectors, and Welders who thrive in a fast-paced culture, and who show up for work each day ready to demonstrate excellence in their work enabling us to provide superior service and equipment to our customers.

What To Expect

When you work on the manufacturing team at Downing or Oso, you know you are working for a successful business that invests in its people. You will experience a positive, team-based work culture that values leadership no matter you level in the company.