Zastosowanie sondy areometrycznej do pomiaru przepuszczalności in situ za pomocą sprężonego gazu

Methods for evaluation of “in situ” coal permeability in underground coal mines using hydrodynamic test data

“…Below you will find an example of the interpretation of the water injection test for a horizontal well using the presented method above [13] and data given in [14]. The plot of p vs. log t is shown in Figure 5 Evaluation of in situ permeability of coal using aerometric probe and compressed air…”

“…It has been demonstrated in [14], that the data measured during such a test, are sufficient for rough approximation of permeability. The relation between the dimensionless pressure and time derived in [14], looks as follows:…”

“…If we assume that the pressure decay vs. time is such as given in [5] (time of pressure drop from 0.4 to 0.25 MPa) and that coordinates of this single measurement fits the straight line of log p D vs. t relation -as indicated by Eq. (16), then it is possible to approximate the value of permeability using the method presented in [14]. Below you will find examples of permeability calculations for one of the Polish coal mines using data given in [5].…”

“…Using the method presented in [14], we analyzed data for four coal bed methane drainage wells. The achieved results are reasonable.…”