Defining Perforating. Date: 08/30/2013. Perforatingâthe act of blasting holes through steel casing, cement, and formation rockâlasts only an instant, but the long-term viability of most oil and gas assets depends upon it. The technique involves carrying explosive charges downhole, where they are detonated to create tunnels that act as conduits through which reservoir fluids flow from the formation into the wellbore and up to the surface.
According to recent data compiled by the Insurance Information Institute, the average cost of comprehensive insurance in the U.S. runs around $136 per year, with a high of $266 per year in the District of Columbia, and a low of $97 per annum in Oregon.
While the cost of a comprehensive eye exam can be as low as $50, the average price for an eye exam is slightly more than $100, with the exact amount dependent on a number of factors. Vision insurance coverage varies. Some plans pay for the exam cost outright, while others require a copay.