166 / | HD | WELLS |
244.1 | DF | PROCESSES {39} |
250.01 | DF | .~ With indicating, testing, measuring or locating {21} |
252.1 | .~.~ Including production of earth fluid by driving fluid {5} | |
252.2 | DF | .~.~.~> Residual oil or oil saturation |
252.3 | DF | .~.~.~> Salinity or acidity |
252.4 | DF | .~.~.~> Flood front |
252.5 | DF | .~.~.~> Permeability or viscosity |
252.6 | DF | .~.~.~> And tracing material |