The ratings of 17 Oil Gas & Consumable Fuels stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Energen Corporation (EGN) earns a D this week, moving down from last week’s grade of C. Energen Corporation engages in the development, acquisition, exploration, and production of oil, natural gas, and natural gas liquids in the continental United States. 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 EGN stock.

Phillips 66 Partners LP (PSXP) is having a tough week. The company’s rating falls from a C to a D. For more information, get Portfolio Grader’s complete analysis of PSXP stock.

This is a rough week for ConocoPhillips (COP). The company’s rating falls to F from the previous week’s D. ConocoPhillips is an international company involved in the exploration, production, refining, and marketing of energy. The company also gets F’s in sales growth, operating margin growth, earnings revisions, earnings surprise, and return on equity. For more information, get Portfolio Grader’s complete analysis of COP stock.

Eni SpA Sponsored ADR’s (E) rating weakens this week, dropping to a F versus last week’s D. 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 growth, earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of E stock.

Slipping from a D to a F rating, Western Refining, Inc. (WNR) takes a hit this week. Western Refining, Inc. is an independent crude oil refiner and marketer of refined products and also operates service stations and convenience stores. The company also gets F’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of WNR stock.

PBF Energy, Inc. Class A (PBF) slips from a D to a F this week. PBF Energy, Inc. Class A operates as an independent petroleum refiner and supplier of unbranded transportation fuels, heating oil, petrochemical feedstocks, lubricants and other petroleum products in the United States. The company also gets F’s in operating margin growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of PBF stock.

This week, Martin Midstream Partners L.P.’s (MMLP) rating worsens to a F from the company’s D rating a week ago. Martin Midstream Partners L.P. provides marine transportation, terminalling, distribution and logistical services for producers and suppliers of hydrocarbon products, specialty chemicals and other liquids. The company also gets F’s in sales growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of MMLP stock.

Par Pacific Holdings Inc (PARR) gets weaker ratings this week as last week’s D drops to a F. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of PARR stock.

This week, Nordic American Tankers Limited (NAT) drops from a D to a F rating. Nordic American Tankers Limited is a shipping company that owns and charters Suezmax tankers for oil transportation. The company also gets F’s in sales growth, earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of NAT stock.

CVR Refining LP (CVRR) declines this week from a D to a F. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CVRR stock.

Renewable Energy Group, Inc. (REGI) experiences a ratings drop this week, going from last week’s C to a D. Renewable Energy Group, Inc. engages in the production, marketing and distribution of biodiesel and its co-products in the United States. The company also gets F’s in operating margin growth, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of REGI stock.

This is a rough week for StealthGas Inc. (GASS). The company’s rating falls to F from the previous week’s D. StealthGas Inc. offers marine transport services for liquefied petroleum gas producers and users. The company also gets F’s in operating margin growth, earnings revisions, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of GASS stock.

TransGlobe Energy Corporation (TGA) slips from a D to a F this week. TransGlobe Energy Corporation is mainly engaged in the exploration for, and the development and production of, oil and gas in Egypt and Yemen. The company also gets F’s in sales growth, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TGA stock.

This week, Southcross Energy Partners, L.P.’s (SXE) rating worsens to a D from the company’s C rating a week ago. The company also gets F’s in sales growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of SXE stock.

SandRidge Mississippian Trust II’s (SDR) rating weakens this week, dropping to a D versus last week’s C. SandRidge Mississippian Trust II owns oil and natural gas wells and is based in Austin, Texas. For more information, get Portfolio Grader’s complete analysis of SDR stock.

Torchlight Energy Resources, Inc. (TRCH) 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 TRCH stock.

Bonanza Creek Energy, Inc. (BCEI) is having a tough week. The company’s rating falls from a D to a F. Bonanza Creek Energy, Inc. is an independent oil and natural gas company. The company also gets F’s in sales growth, earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of BCEI 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.