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Marathon Petroleum Corporation · 1 day ago

Refining Chemical Engineering Intern/Co-op Summer 2026

Martinez, CA

Internship

Onsite

Intern

$32.92/hr - $41.67/hr

Start in 2026 Summer

Marathon Petroleum Corporation is committed to being a great place to work, fostering a collaborative team environment. As a Chemical Engineering Intern/Co-op, you will gain hands-on experience in various refinery operations, enhancing your technical knowledge and critical thinking skills while working alongside experienced professionals.

EnergyNatural ResourcesOil and Gas

No H1B

Responsibilities

As a Chemical Engineer at a Marathon refinery, you can expect to become familiar with process equipment fundamentals and best practices, build critical thinking skills, and gain an understanding of how all engineering disciplines work together as a cohesive team

You will also gain knowledge of various aspects of a refinery by working with a team of professionals who run a specific portion of the refining process

Most often, Chemical Engineers will have an opportunity to work on more than one area of the refinery, leading to a broad understanding of how the plant operates

Finally, you will have the opportunity to expand your written and verbal presentation skills in a professional work environment

Process / Technical Service Engineers may work on a variety of projects in the Technical Services Department together with your mentor that put your classroom experience as a Chemical Engineer into practice

The vast majority of our Chemical Engineering interns/co-ops work in this area

The experience will expand your understanding of the refining environment and technical aspects of the refinery

Past projects/duties include: develop and lead test runs to optimize refinery operations; perform process engineering calculations concerning the various process technology (or equipment) in the refinery; monitor and make recommendations in regards to catalyst and adsorbents; complete projects and provide recommendations for improvements to the refinery process and equipment

Operations Research Engineers may help develop planning, blending, scheduling, and process models for refinery engineers

The models are used to optimize crude oil purchasing, refinery production, blending and finished product scheduling, and optimization of refinery production

Typical college co-op assignments include: validation of production data and mass balancing, process modeling, and development of graphical interfaces of refinery process units

Environmental Engineers work on projects that involve the compliance of the entire refinery, and you will be exposed to the majority of process units in the refinery

You will be applying the engineering principles and calculations to various environmental projects and will also give you a broad knowledge of the various environmental laws that are applicable to refineries and what it takes to maintain compliance with those laws

Past projects/duties include: perform process calculations for the Risk Management Plan, including taking physical surveys of refinery process units; work on various process engineering projects within a Wastewater Treatment Plant; participate in inspections and/or testing that is conducted by federal, state, or local officials

Products Control / Economics Engineers may work on a wide array of projects including operations, blending, and refinery economics

You will gain an understanding of how a tank farm is operated and how gasoline and other products are prepared and shipped to customers

In addition, you will gain some exposure to the overall economics of the refinery and how operating decisions are made based upon these economics

Past projects/duties include: analyze refinery process flow data and compare to recommended optimum levels, this will help in identifying equipment failures which cause variances in capacity from the optimum levels; update information on gasoline blends and tank samples in preparation for an annual blender waiver audit; develop applications to better present process data for refinery operating decisions