It has been nearly 16 months since Halliburton agreed to acquire Baker Hughes in a $35 billion cash-and-stock deal. The deal has yet to close because regulators fear that it will stifle competition in the oil-field service sector by widening the gap between the top tier players and the next tier down. To alleviate these fears Halliburton has proposed a number of asset divestiture plans, but none of those plans have changed regulators' minds.