Two weeks of thin declines in the U.S. rig count have raised expectations that drilling activity is nearing a pivotal level that could dent production, bolster prices and coax idle rigs back to the field after a precipitous cull since October. Energy producers responded quickly to a steep drop in oil prices over the last six months, idling nearly 800 rigs, or 50 percent, since a peak of 1,609 rigs in October. In the last week of January, rigs fell by 94, the biggest drop on record, according to a weekly survey by oil service firm Baker Hughes. [RIG/U] U.S. companies remain nervous about oil prices. Spending has been cut as prices fail to rebound significantly, and further price drops could quickly lead to more shrinkage in the rig count. But the decline has slowed, dropping by just 23 rigs in the last two weeks, […]