煤层气井下电子压力计应用（Application of electronic pressure gauge in coalbed methane well）.docVIP

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煤层气井下电子压力计应用（Application of electronic pressure gauge in coalbed methane well）.doc

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煤层气井下电子压力计应用（Application of electronic pressure gauge in coalbed methane well）

煤层气井下电子压力计应用（Application of electronic pressure gauge in coalbed methane well） How to avoid the leakage of downhole pressure gauge in long-term work? In the CBM production process, observation of downhole pressure pressure gauge in the harsh environment, affected by external pressure and pump vibration, prone to Water Leakage phenomenon, which leads to the failure of the instrument, CBM was forced to interrupt play well, even caused loss is very large. When users select pressure timing, they not only require accurate and reliable measurement, but also pay more attention to the reliability of the downhole pressure gauge. From a technical analysis, downhole pressure gauge three places prone to Water Leakage phenomenon: the first is the sensor pressure near the point; second is the seal warehouse core circuit board; third is the instrument and logging cables connecting part. The seal is mainly composed of manufacturing process to ensure the pressure near the point, usually in the machining center with high precision, through careful design of structure parameters, can guarantee the pressure near the bear pressure above 30MPa without Water Leakage. The seal bin adopts the O ring sealing technology, and the same high precision machining can guarantee the pressure resistance of 30MPa. The connection between the instrument and the cable is the easiest place to cause leakage. To realize the connection between the instrument and the cable, we usually refer to this process as armored.. It must ensure the following: first, signal cable and instrument connection must be flexible connection, does not bear the axial tension; anti rotation device to between two, cable and instrument, to avoid signal connection was broken; three, cable and instrument connection point should be sunk in the insulation filling material, the influence of the external pressure only to ensure the filling materials, electrical and external insulation. Changzhou Kai Rui has a high precision CNC machining c