|
You use a directional motor to drill directional wells. The motor has a bend on the bottom 4 feet anywhere from 1-3 deg. The bit also spins from the gallon per minute pumped threw the string. You can rotate the bit only by pumping mud threw it. This is how you get your curve in the hole. You just point the bend where you want it to go. ( it's way more complicated then this). And if you want it to go straight in the direction that you have started it going you rotate the bit and the string at the same time.
The way they know where the bend is facing is called a WMD tool. It's works off of a magnetic tool face. They take surveys every 30 feet and plot it on a map. This is how they know where they are every time. It is all much more complicated then this but I tried to put it short and sweet.
|