What would have happened if you’d open a buy trade in oil when it was exactly zero worth?

You probably all know oil dropped to I believe -70ish 1 or 2 years ago. And I was wondering what would happen to a position that was entered either at a negative level or at zero while the stock rises into the positive value? As I gather, the closer to zero, the larger the percentage-wise fluctuations, which mean it would become harder to risk manage.