This week, 21 Oil Gas & Consumable Fuels stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This is a strong week for Chevron Corporation (CVX). The company’s rating climbs to B from the previous week’s C. Chevron Corporation is an integrated energy company with operations in countries located around the world. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of CVX stock.

Magellan Midstream Partners, L.P. (MMP) earns a B this week, jumping up from last week’s grade of C. Magellan Midstream Partners, L.P. is primarily involved in the storage, transportation, and distribution of refined petroleum products and ammonia. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of MMP stock.

Western Gas Partners, LP (WES) boosts its rating from a C to a B this week. Western Gas Partners, LP operates, acquires, and develops midstream energy assets in east, west, and south Texas; the Rocky Mountains; and the Mid-Continent. The company also gets A’s in operating margin growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of WES stock.

Range Resources Corporation (RRC) is seeing ratings go up from a C last week to a B this week. Range Resources Corporation is engaged primarily in the exploration, development and acquisition of natural gas properties. The company also gets A’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of RRC stock.

This week, Pembina Pipeline Corporation’s (PBA) ratings are up from a C last week to a B. Pembina Pipeline Corporation transports, stores, and markets petroleum products. The company also gets A’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of PBA stock.

The rating of Alliance Holdings GP, L.P. (AHGP) moves up this week, rising from a C to a B. Alliance Holdings GP, L.P. produces and markets coal to utilities and industrial users in the United States. The company also gets A’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of AHGP stock.

Summit Midstream Partners LP (SMLP) gets a higher grade this week, advancing from a C last week to a B. For more information, get Portfolio Grader’s complete analysis of SMLP stock.

This week, Cross Timbers Royalty Trust (CRT) pushes up from a C to a B rating. Cross Timbers Royalty Trust is an express trust in the United States. The company also gets A’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of CRT stock.

Columbia Pipeline Partners LP (CPPL) shows solid improvement this week. The company’s rating rises from a C to a B. For more information, get Portfolio Grader’s complete analysis of CPPL stock.

Enable Midstream Partners LP (ENBL) improves from a C to a B rating this week. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of ENBL stock.

Laredo Petroleum, Inc.’s (LPI) ratings are looking better this week, moving up to a B from last week’s C. Laredo Petroleum, Inc. is an independent energy company which engages in exploration, development and acquisition of oil and natural gas properties in the Permian and Mid-Continent regions of the United States. The company also gets A’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of LPI stock.

WPX Energy, Inc. Class A (WPX) gets a higher grade this week, advancing from a C last week to a B. WPX Energy, Inc. Class A is an independent natural gas and oil exploration and production company which is engaged in the exploitation and development of long-life unconventional properties. For more information, get Portfolio Grader’s complete analysis of WPX stock.

This week, Westmoreland Coal Company (WLB) pushes up from a C to a B rating. Westmoreland Coal Company mines coal, which is used to produce electric power, and owns power-generating plants. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of WLB stock.

JP Energy Partners LP (JPEP) shows solid improvement this week. The company’s rating rises from a C to a B. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of JPEP stock.

This is a strong week for Pacific Ethanol, Inc. (PEIX). The company’s rating climbs to B from the previous week’s C. Pacific Ethanol, Inc. produces and markets low-carbon ethanol. The company also gets A’s in sales growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of PEIX stock.

Permian Basin Royalty Trust (PBT) is seeing ratings go up from a C last week to a B this week. Permian Basin Royalty Trust is the owner of overriding royalty rights in mineral properties in the United States. The company also gets A’s in earnings momentum and return on equity. For more information, get Portfolio Grader’s complete analysis of PBT stock.

Sanchez Energy Corporation’s (SN) ratings are looking better this week, moving up to a B from last week’s C. Sanchez Energy Corporation is an independent exploration and production company focused on the exploration, acquisition and development of unconventional oil and natural gas resources. The company also gets A’s in earnings revisions and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SN stock.

The rating of Enerplus Corporation (ERF) moves up this week, rising from a C to a B. Enerplus Corporation is an oil and gas exploration and production company that owns a large, diversified portfolio of income-generating crude oil and natural gas properties. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of ERF stock.

Foresight Energy LP (FELP) boosts its rating from a C to a B this week. For more information, get Portfolio Grader’s complete analysis of FELP stock.

Gran Tierra Energy Inc. (GTE) earns a B this week, jumping up from last week’s grade of C. Gran Tierra Energy Inc. is an international oil and gas exploration and production company. For more information, get Portfolio Grader’s complete analysis of GTE stock.

Mid-Con Energy Partners, LP (MCEP) improves from a C to a B rating this week. Mid-Con Energy Partners, LP owns, operates, acquires, exploits and develops oil and natural gas properties in North America, with a focus on the Mid-Continent region of the United States. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of MCEP 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.