This week, the ratings of 7 Oil Gas & Consumable Fuels stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Slipping from a C to a D rating, Hess Corporation (HES) takes a hit this week. Hess Corporation discovers, develops, manufactures, and markets companion animal health products, primarily for dogs, cats, and horses. The company also gets F’s in sales growth, operating margin growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of HES stock.

This is a rough week for Eni SpA Sponsored ADR (E). The company’s rating falls to D from the previous week’s C. Eni SpA Sponsored ADR works in oil and gas exploration and production, gas marketing operations, management of gas infrastructures, power generation, petrochemicals and oil field services. The company also gets F’s in sales growth, operating margin growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of E stock.

Cheniere Energy Partners, L.P. (CQP) slips from a C to a D this week. Cheniere Energy Partners, L.P. owns and operates the Sabine Pass liquefied natural gas (LNG) terminal located in western Cameron Parish, Louisiana on the Sabine Pass Channel. The company also gets F’s in earnings revisions, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CQP stock.

Nordic American Tankers Limited’s (NAT) rating weakens this week, dropping to a D versus last week’s C. Nordic American Tankers Limited is a shipping company that owns and charters Suezmax tankers for oil transportation. The company also gets F’s in earnings revisions and earnings momentum. For more information, get Portfolio Grader’s complete analysis of NAT stock.

GeoPark Ltd (GPRK) experiences a ratings drop this week, going from last week’s C to a D. The company also gets F’s in sales growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of GPRK stock.

Erin Energy Corporation (ERN) declines this week from a C to a D. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of ERN stock.

VAALCO Energy, Inc. (EGY) gets weaker ratings this week as last week’s C drops to a D. VAALCO Energy, Inc. is an independent energy company, which is mainly engaged in the acquisition, exploration, development and production of crude oil and natural gas. The company also gets F’s in sales growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of EGY stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.