An Technical Research On The Improvement Of Temperature Performance Of The Coaxial Line Water Detector

Thermal recovery method is the most extensive and most efficient mining technology for the current heavy oil field development at home and abroad, and one of the measures in heavy oil field development of the late stable yield. In Heavy oil recovery, a thermal recovery intermittent steam drive technology is used first. After entering the high-cycle throughput stage, the reservoir of energy dropped drastically, thus the level of reservoir pressure to keep is reduced to a record low point, which leads to a long period of thermal recovery handling drainage, a decline in the low level of daily output for cycle oil production, together with steam channeling, flooding, sand serious, consequently, it is difficult for thermal recovery throughput to enter the exploitation phase of steam flooding. In order to continue to yield and effectively control production, in the frequent mining blocks, it is demanded that fluid production profile be tested two times per year to grasp the dynamics of thick oil layer, and rationally carry out the injection dynamic deployment, which is the so-called profile control. The Steam flooding oil wells is characterized by the following: high produced fluid temperatures, large areas viscosity changes, difficult wells fluid production profile monitoring , and lack of suitable annulus water detector.Coaxial line water detector has a large measuring range and a high resolution of water. But the instrument temperature indicator is only 125℃, the equipment does not work properly in thermal recovery wells. In the high temperature part of the temperature indicators of the circuit mostly affected water detector under the environment of coaxial line.In this paper, a circuit board that can work in a 145℃environment is researched. Through the choice of components, low-power design, circuit designed according to functional modules, and the structural design of the circuit board, the circuit working properly under 145℃environment is achieved. Through the design of a small-diameter vacuum flask that is suitable for coaxial line through the water detector, the circuit part of the instrument can work at 150℃and above environments, thus increase the temperature performance of the instrument.