This week, 17 Oil Gas & Consumable Fuels stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, PetroChina Co. Ltd. Sponsored ADR (PTR) drops from a D to a F rating. PetroChina Co. Ltd. Sponsored ADR explores for, develops, produces, and sells crude oil and natural gas, and is engaged in refining crude oil and petroleum products. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of PTR stock.

This week, TC PipeLines, LP’s (TCP) rating worsens to a D from the company’s C rating a week ago. TC PipeLines, LP acquires, owns and participates in the management of energy infrastructure businesses in North America. The company also gets F’s in earnings surprise and earnings momentum. For more information, get Portfolio Grader’s complete analysis of TCP stock.

HollyFrontier Corporation (HFC) declines this week from a C to a D. HollyFrontier Corporation refines, transports, stores and markets petroleum products. The company also gets F’s in sales growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of HFC stock.

Energy Transfer Partners, L.P.’s (ETP) rating weakens this week, dropping to a F versus last week’s D. Energy Transfer Partners, L.P. is involved in natural gas processing, transportation and marketing operations, and sells propane and propane-related products and services to residential, commercial, industrial and agricultural customers. The company also gets F’s in sales growth, earnings revisions, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of ETP stock.

Gulfport Energy Corporation (GPOR) gets weaker ratings this week as last week’s D drops to a F. Gulfport Energy Corporation owns and operates oil and gas properties in the Louisiana Gulf Coast area of the United States. 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 GPOR stock.

CVR Energy, Inc. (CVI) is having a tough week. The company’s rating falls from a D to a F. CVR Energy, Inc. engages in refining and marketing transportation fuels in the United States. The company also gets F’s in sales growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of CVI stock.

Slipping from a C to a D rating, Ultrapar Participacoes S.A. Sponsored ADR (UGP) takes a hit this week. Ultrapar Participacoes S.A. Sponsored ADR is engaged in the fuel distribution and chemical businesses in Brazil. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of UGP stock.

CVR Refining LP (CVRR) earns a D this week, moving down from last week’s grade of C. The company also gets F’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of CVRR stock.

Alon USA Partners LP (ALDW) slips from a C to a D this week. The company also gets F’s in sales growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of ALDW stock.

This is a rough week for Teekay LNG Partners L.P. (TGP). The company’s rating falls to F from the previous week’s D. Teekay LNG Partners L.P. provides marine transportation services for liquefied natural gas, liquefied petroleum gas and crude oil. The company also gets F’s in earnings growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of TGP stock.

NGL Energy Partners LP (NGL) experiences a ratings drop this week, going from last week’s D to a F. NGL Energy Partners LP owns and operates a vertically-integrated propane business. The company also gets F’s in sales growth, earnings revisions, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of NGL stock.

Ring Energy, Inc.’s (REI) rating weakens this week, dropping to a F versus last week’s D. 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 REI stock.

JP Energy Partners LP (JPEP) is having a tough week. The company’s rating falls from a C to a D. The company also gets F’s in sales growth, earnings revisions, and free cash flow. For more information, get Portfolio Grader’s complete analysis of JPEP stock.

This is a rough week for Teekay Offshore Partners L.P. (TOO). The company’s rating falls to F from the previous week’s D. Teekay Offshore Partners L.P. provides marine transportation and storage services to the offshore oil industry. The company also gets F’s in operating margin growth, earnings growth, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TOO stock.

This week, Clean Energy Fuels Corp.’s (CLNE) rating worsens to a D from the company’s C rating a week ago. Clean Energy Fuels Corp. sells natural gas fueling solutions to its customers mainly in the United States and Canada. The company also gets F’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of CLNE stock.

Memorial Production Partners LP (MEMP) slips from a D to a F this week. Memorial Production Partners LP engages in the acquisition, development, exploitation, and production of oil and natural gas properties. The company also gets F’s in sales growth, earnings growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of MEMP stock.

Slipping from a C to a D rating, Amyris, Inc. (AMRS) takes a hit this week. Amyris, Inc. provides alternatives to a range of petroleum-sourced products used in specialty chemical and transportation fuel markets worldwide. The company also gets F’s in sales growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of AMRS 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.