There have three decisive questions need to solve while drilling in sand gravel layer. The first question is drilling footage.
Field tests also show that the self-resonating cavitation nozzle is highly effective in reducing bit wear, increasing drilling footage and drilling speed.
The total costs of oilfield exploration can be divided, according to exploratory area, contract method, and the type of well, into simple groups in order to evaluate separately the influence of drilling footage and average unit cost on the total costs.
