Real-time prediction method and system for underground residual safe operation time of logging instrument

Abstract

The invention belongs to the related field of logging technology, and discloses a real-time prediction method and system for underground residual safe operation time of a logging instrument. The method comprises the following steps: S1, acquiring an underground environment temperature and a temperature signal of a logging instrument node in real time; s2, constructing a one-dimensional transient heat transfer model of the logging instrument; calculating the change of the future temperature of the logging instrument along with time according to the current temperature signal and a one-dimensional transient heat transfer model of the logging instrument; and S3, obtaining the residual safe operation time of the logging instrument under the current well condition based on the future temperature change curve of the logging instrument. The method has the advantages of high prediction precision, short calculation time consumption, convenience in programming and embedded development, wide applicability to various working conditions and the like. According to the method and the device, the problem of predicting the residual safe operation time in real time during underground operation of the logging instrument is solved, and safe operation of the logging instrument in a high-temperature underground well is guaranteed.

Description

technical field [0001] The invention belongs to the related field of well logging technology, and more particularly, relates to a real-time prediction method and system for the remaining safe operation time of a well logging instrument downhole. Background technique [0002] As the global demand for oil and gas resources continues to rise and shallow oil fields are depleted, the oil industry has begun to exploit deeper fields. However, as the well depth increases, the downhole temperature will also increase. In the industry, a well with a well temperature of 205 °C and a downhole pressure of 140 MPa is defined as a high temperature and high pressure well. Logging instruments are often used to explore the distribution of oil and gas resources in deep underground and are widely used in the petroleum industry. It is very difficult to explore and mine high temperature and high pressure wells. A major challenge is the high temperature problem in the well. The circuit board insid...

AI Technical Summary

Problems solved by technology

Commercial finite element software such as ANSYS can simulate the future temperature trend of the logging tool to obtain the remaining working time of the logging tool, but it takes a lot of computing time and cannot meet the needs of real-time prediction

The Chinese invention patent of CN 113190955A discloses "a method for generating a temperature prediction model for logging tools", and designs a temperature prediction model based on an improved adaptive extended Kalman filter, which is essentially a data set-driven The prediction method does not involve the physical process of heat transfer of logging tools, so it can only predict the temperature change trend of tens of minutes in the future. For the temperature prediction of a longer time in the future, this method cannot guarantee the accuracy

Therefore, for the real-time prediction of the remaining safe operating time of logging tools under complex well conditions, neither the commercial finite element method nor the data-driven temperature prediction model can satisfy real-time performance and high-precision prediction under any working conditions. Demand for temperature trends

Images