Cased hole formation dynamics tester for imaging in the formation pressure, effective permeability imaging, skin factor imaging, fluid productivity index imaging logging technology as a whole, with a dual packer formation test of comprehensive logging instrument. It is used in perforating casing well after the test, or for oil and gas production wells of early, middle and late formation test.
The main characteristics of multi layered testing instrument is for transmission control signal with cable and the measuring signal, downhole instrument of the hydraulic system can make the upper and lower packer seat seal and re-opened. When the seat seal packer section of the annular space of the well fluid and the packer segment of formation fluids into the test chamber of the instrument, and then filled with the test chambers, the pressure of test chambers is recorded by the pressure sensor changes over time. Due to the flow rate is given and adopted the different flow test several times, using the formation percolation theory can be measured directly the various of dynamic characteristics of the strata.