| 摘要 |
<p>During conventional injection tests carried out on oil production wells, only hydraulic quantities characteristic of the fluid injected into the well (essentially pressure, temperature, flow rate) have been measured hitherto. The present invention makes it possible to add thereto microseismic measurements representative of the acoustic emission induced by the injection. For this, a probe has been developed which consists of a string (10) of essentially tubular cartridges (4, 6, 8) connected together by flexible links (Fi), at least some of the said cartridges (4, 6, 8) accommodating means for measuring microseismic quantities representative of the acoustic emission induced by the injection of a fluid into the well, characterised in that all the cartridges (4, 6, 8) have a diameter which is small enough for them to be inserted into a pipe column installed in the well. At the same time, a measurement method is proposed which makes use of this probe during an injection test comprising at least one fluid injection period (I) followed by a rest period (II), the well pipe column comprising at least one level of perforations, characterised in that the probe is lowered into the well and is then immobilised near the level of perforations so as to measure at least the microseismic quantities preferably associated with hydraulic quantities during at least the rest period (II). Besides a more accurate picture of the well injectivity, the present invention thus leads to a test procedure which is both better adapted to actual needs (by virtual of the probe being modular) and less laborious (the probe making several measurements during a single trip through the well). <IMAGE></p> |
