Oil services stocks edged higher today, with the

Philadelphia Stock Exchange Oil Services Sector Index

breaking through its 200-day moving average, and

Halliburton

(HAL) - Get Report

and

Cooper Cameron

(CAM)

leading the way.

Halliburton traded up recently by 3.9% to $43.41. The oil services provider "looks great," said Todd Gold, a technical strategist at

Gruntal

. "Your next resistance is at 45, and after that there's nothing until 50." Halliburton has been climbing steadily since the beginning of April, gaining 28.9% through the end of last week.

Halliburton's move is enough to lead the rest of the index higher, Gold said. Sector counterparts

Schlumberger

(SLB) - Get Report

and Cooper Cameron are also gaining on the day. Cooper Cameron climbed 1.7% to $65.79, while Schlumberger rose 2% to $63.18.

The oil services index, or OSX, has gained more than 17% since April 3. "The OSX has been stumbling around between moving averages," Gold said. "I don't see anything particularly bullish there." Mike Hurley, a technical analyst at

Wit SoundView

said the next resistance level for the OSX is at 140. The index currently stands at 124.93, up 2.8% on the day.

Other members of the sector also attracted buying interest. Offshore energy services concern

Tidewater

(TDW) - Get Report

recently gained 3.1% to $46.62.

Transocean Sedco Forex

(RIG) - Get Report

rose 2.2% to $51.01, and

Smith International

(SII)

gained 1.8% to $77.30.

Gold said that while he doesn't see a "wildly bullish" chart on the oil services group, he is "bullish on these stocks" over the longer term.