By Rithika Krishna and Liz Hampton (Reuters) – Top oilfield services firm Schlumberger reported a higher first-quarter profit on Friday and increased its dividend by 40%, as rising oil prices boosted demand for services and equipment. Oil prices climbed to their highest in more than a decade during the quarter as Russia’s invasion of Ukraine upended global supply dynamics. Oilfield service firms, including Halliburton Co and Baker Hughes Co, posted stronger year-over-year profits and are forecasting higher margins this year as activity recovers from the coronavirus pandemic. “The confluence of…