"The oil-services sector remains my favorite long-term play in the energy industry," says sector specialist Elliott Gue. In The Energy Strategist, the advisor looks to industry-leader Schlumberger (NYSE: SLB).

Gue explains, "Oil services firms will benefit directly from the increasing technical complexity of oilfield development. International business is the primary driver for Schlumberger, which generated only 22% of its revenues from North America in 2008.

"The important question is, where do we sit in the cycle for international operations? In my view, the second half of 2010 will mark the beginning of a new uptrend.

"Over the next five years the energy patch should offer some of the best investments around, and one standout is Schlumberger (NYSE: SLB)," says Stephen Leeb in The Complete Investor.

"Schlumberger, by a wide margin, is the best and most dominant. Its services range from well testing to pressure pumping to seismic testing, and it's No. 1 in virtually every area it occupies.

"Some of its operations, especially those that maintain the health of existing wells, are highly recession-resistant.

Here are some highlights from this past week's earnings coverage from BloggingStocks:

• Amazon.com Inc. (NASDAQ: AMZN) reported strong Q1 results easily beat expectations.
• Bank of America Corp. (NYSE: BAC) posted better-than-expected Q1 earnings, helped by home refinancing.
• Caterpillar Inc. (NYSE: CAT) reported its first quarterly loss since 1992 and cut its revenue outlook.
• Coca-Cola Co. (NYSE: KO) posted Q1 earnings that were in line with expectations, but shares fell.
• eBay Inc. (NASDAQ: EBAY) posted better-than-expected Q1 earnings despite a decline in sales.

Early this morning, oil firm Schlumberger (NYSE: SLB) reported earnings of 78 cents per share -- which was considerably lower than last year's same-quarter results of $1.09 per share. While the results were worse than a year ago, SLB managed to top the consensus estimate by three cents. Quarterly revenue totaled $6.0 billion, which was off from last year's revenue of $6.29 billion.

SLB, which is the world's largest oilfield services company, attributed the lower results to a slump in energy demand, which forced customers to reduce activity and search for price reductions. The company also noted that the rate of decline in its oilfield services division dropped considerably compared to the fourth quarter, thanks mainly to a sharp drop in the firm's North American natural gas rig count. SLB stated, "Our visibility on 2009 has not materially changed from the end of the fourth quarter."

Valero Energy (NYSE: VLO) closed at $20.50. VLO is scheduled to report Q1 EPS on April 28. Crude oil futures are recently up 1.51% to $49.59. VLO May option implied volatility of 63 is below its 26-week average of 73 according to Track Data, suggesting decreasing price movement.

Schlumberger (NYSE: SLB) closed at $46.23. SLB is scheduled to report Q1 EPS on April 24. May option implied volatility of 61 is below its 26-week average of 65, according to Track Data, suggesting decreasing price movement.

Option Update is provided by Stock Specialist Paul Foster of theflyonthewall.com

"Many experts believe that oil prices are at unsustainably low prices now, and they expect a sharp rise in the commodity price as supply and demand come back into line again," says turnaround expert George Putnam.

In The Turnaround Letter, he suggests, "If oil does begin to rise again, the oilfield service stocks could rebound sharply." Here, he takes a look at large cap plays on a rebound within the oilfield services sector.

"We all know that oil prices have fallen dramatically from their highs in the summer of 2008. But different types of oil-related stocks have reacted quite differently to the price change in the underlying commodity.

"For example, while oil itself has dropped nearly 70% from its 12-month high, the stock of the largest integrated oil company, Exxon-Mobil (NYSE: XOM), is down only 26%, less than the stock market as a whole.