The hired hands of the oil patch who map underground pockets of crude and drill new wells have seen some of the worst pain since the global pandemic first began to wreck energy markets. The number of wells drilled worldwide this year is expected to drop by almost a quarter, with no forecast of a full recovery in the coming years, according to industry consultant Rystad Energy. Schlumberger is the last of the big three oil service companies to report second-quarter results. Halliburton Co. impressed investors with better-than-expected cost cuts while announcing a new strategy to role out more technology and look internationally for better revenue growth. Baker Hughes Co. warned investors of a possible second wave of coronavirus cases leading to lockdowns again.