Development And Application Of Cementing Construction Monitoring And Warning System

Cementing operation is a very important link in oil and gas well engineering,which is a systematic engineering project with multiple construction processes,short operation time,strong technical nature,high risk,and certain concealment.The quality of cementing is directly related to the efficient development of oil and gas fields,the smooth progress of subsequent operations,and even the production life of oil and gas wells.Cementing technology involves geology,petroleum,machinery,chemistry,fluid mechanics and other disciplines,which leads to the complexity and uncertainty of cementing engineering.Especially for some wells with complex geological conditions,there are still significant technical challenges,such as complex situations such as well leakage,gas invasion,insufficient cement return height,and unqualified cementing quality during the cementing process.The main reason is that for the fine monitoring and management process of cementing process,it is far from enough to rely on manual observation and identification and experience estimation to judge the complex downhole conditions.The traditional method has poor timeliness and strong experience.In the face of massive cementing construction data,it cannot quickly and accurately distinguish the abnormal characteristics of downhole,and there is a lack of effective inversion means of cementing construction.Moreover,it is impossible to monitor downhole dynamic process,which leads to many uncertainties in cementing operations under complex conditions.Therefore,in order to ensure the safety of construction operations,improve the quality of cementing,and solve the problems of the lack of cementing monitoring means,incomplete monitoring process,lack of analysis and early warning function,this paper developed a set of cementing construction monitoring and early warning system.The system uses low-power MCU(microprocessor)to collect sensor data,and transmits the data remotely to the monitoring platform of the upper computer through the Lo Ra wireless module and self-designed network transmission protocol,and the upper computer processing software is adopted.NET Framework3.5 framework can be developed to monitor construction parameters such as cement slurry density,wellhead injection pressure and flow rate in real time during cementing process,and establish theoretical analysis model of downhole dynamic parameters based on the "U-tube" effect.Combined with threshold method and fuzzy logic method,a system early warning model is built to give early warning to downhole risks such as choke,loss and overflow in cementing process.Field tests show that the system can monitor the construction parameters of the whole process of cementing grouting,plugging and grouting,and calculate the actual flow rate in the well,the length of the vacuum section,the ECD of the bottom hole and weak spot,the flow pattern of concern and other parameters in the cementing process in real time,aiming at downhole risk warning such as choke,loss and overflow.It has the characteristics of accurate data collection,stable signal transmission,reliable analysis and early warning,and convenient field use.It provides a technical means for ensuring the safety of cementing operation in real time and improving the quality of cementing.