OOPS... I didn't answer the question, sorry about that, Heres how Hedging and Oil relate.
I'll use Cocoa futures as an explanation because it is easier to understand because in the oil markets there are so many different players it is hard to follow. The principle involved is exactly the same.
In the Cocoa market you have two major players, Cocoa farmers, and chocolate makers like Hersheys.
Hershey's buys cocoa all year long for delivery to there processing plant. Because commodities have volatile prices and cocoa is one of the worst. In order to flatten their cocoa price Hersheys can go to the futures market and buy or sell cocoa futures based on there needs - This is called Hedging it is typically only done by large producers or consumers of commodities.
When Hersheys actually buys their cocoa for delivery they will pay the SPOT price which the price for cocoa delivered on the spot in exchange for cash. The spot prices goes up and down based on supply and demand. Hershey knows every month how many rail cars of cocoa they need to buy, but they can't buy it on the spot market all at once and store it in their garage. so what Hershey's can do is Purchase a futures contracts for a set delivery month. Then they buy the actual commodity as needed on the spot market.
When cocoa futures prices come down to a level that Hershey is willing to pay, to keep there operation profitable they buy contracts across the board in all there delivery months.
If cocoa prices go up from there, Hershey's will profit on there futures trade and use that profit to offset the price increase when they buy on the SPOT. Should prices decline, then they will lose money on there futures trade but save on there SPOT purchase and still come out with a flat price.
The purpose of the hedge is not so much to make money as it is to transfer price risk. A good hedging program is designed to keep a producers or a consumers price in a stable range.
Hersheys used to be the largest player in the cocoa market I think MM/Mars is now. At any one time hersheys could be long in one account and short in another all designed to keep their cost to produce flat.
SOuthWest airlines which is one of the few airlines that turns a profit every year hedges their fuel costs in the oil market. I believe CH Robinson Worldwide which is a trucking company hedges their fuel costs through the oil market also.
Now if the futures markets didn't have speculators in the game when Hersheys called there broker to buy or sell, there would be no one on the other side to trade with and the whole system would collapse.
As far as speculators driving prices up, in reality they cant, if Hersheys aint buying specs cant sell and vice versa. 95% of all futures contracts are closed before they delivery date, which means they are paper transactions only and the ones that deliver are on expensive small commodities like gold and silver.
Since you cant speculate cash prices unless you have a whole lot of cash and warehouse space the spec premium is basically non-sense.
High oil prices are driven by demand, The US is the worlds largest consumer of oil, Japan is 2nd and China is third. China has a population that is 5 times the size of the US, at this time only about 1 in 20 chinamen owns a car. Well as they buy more they will need more fuel, not to mention plastic and every thing else that comes from oil, prices will keep going up because the demand curve is there. This sais nothing about India which has 4 times the population of the US.
Both China and India are in the same state of Industrialization that the US was in during the 20's they are growing up fast and buying more food and fuel and products. Oil is up because of demand.