Drilling Fluid Wellbore Circulation Temperature And Pressure Research On Measurement And Analysis Methods

With the continuous deepening of exploration and development,the target well depth of drilling and completion projects has continued to increase,and the geological conditions of oil and gas reservoirs have become more and more complex.The complex downhole environment,especially the narrow safe density window and other problems will lead to complex and frequent occurrences of leakage and well kicks.In order to prevent complex occurrences,engineers need to accurately grasp the drilling parameters and bottom hole conditions,especially the temperature and pressure of the wellbore fluid,which It can reflect the dynamic balance between formation and wellbore.The current monitoring of wellbore temperature and pressure mainly uses real-time measurement with MWD instruments,but MWD instruments have certain limitations,mainly reflected in the high measurement cost,and the measurement information is mainly the engineering parameter information at the bottom hole assembly.Stereoscopic measurements of full wellbore temperature and pressure are lacking.In order to solve this problem,this thesis designs and completes a new microchip system for wellbore temperature and pressure measurement on the basis of comprehensive consideration of economic cost and test efficiency.The system is divided into two parts: hardware and software.The hardware is a spherical temperature and pressure measurement microchip tool that integrates various sensors,processors and power sources,which can measure temperature and pressure during the circulation of drilling fluid in the wellbore.The software is written in C# language,which can read and analyze the data stored in the tool.Based on the working principle of the microchip tool,the overall structure,hardware selection and packaging design are carried out.The designed microchip tool has a compact structure,small size and high strength.At the same time,in order to test the function of the microchip tool,a series of laboratory experiments were carried out.The experimental results show that the designed microchip tool can resist the harsh wellbore environment and realize the measurement of the circulating temperature and pressure of the drilling fluid wellbore.Aiming at the errors generated in the measurement process,the error sources of the system measurement process are analyzed,and corresponding processing methods are established according to different error sources.The first is to use median average filtering and moving average filtering algorithms to process temperature and pressure data to effectively remove noise interference.Then the temperature and pressure sensors are calibrated,and an error compensation model is established,which effectively improves the measurement accuracy.At the same time,the depth positioning method is used to correlate the temperature and pressure with the depth,and the parameters of the temperature and pressure profile of the whole wellbore are established.When complex working conditions occur downhole,the wellbore profile parameters measured by the measuring tool will have corresponding abnormal changes,which are visually displayed on the parameter change trend graph to provide a reference for judging drilling conditions.This technology is an innovative technology for the detection of oil drilling conditions.The designed microchip tool can continuously measure the entire wellbore,effectively making up for the limitations of the existing technology.It is very important to ensure construction safety and improve work efficiency.