The oil industry is a very literal industry. It's a rare oil company that doesn't have an oil derrick for a logo.
Bruington Engineering is a small company with big services. The company's expertise covers four different areas, which is uncommon, if not unheard of, in a small engineering company. This unique attribute of the business presented the opportunity to take traditional imagery and make it unique.
The four icons in the logo are readily recognizable by people in the industry to represent production, completion, drilling and consulting - Bruington's four areas of service. The non traditional use of four icons instead of one for the logo immediately draws attention to the four areas of service, but the mark is still literal enough that it works in the industry.