Brent crude is trading over $100 per barrel, WTI has topped $90, but oil drillers in the world’s largest producer are cautious about their future plans. In fact, they are rather unhappy with the war in the Middle East, because it has made it harder to plan investments. On the face of it, everything is perfect, price-wise. WTI is trading much higher than what shale drillers need to be profitable. According to the latest Dallas Fed Energy Survey, the range of WTI profitable drilling price levels for the oil patch is between $62 per barrel for…