Analysis Of Pressure Wave Generator Pipeline Pulse Transmission

In recent years,intelligent water injection technology has made important progress,and wireless data transmission technology in Wells is urgently needed as a technical support to improve the reliability of downhole equipment and reduce installation costs,so as to promote its large-scale application in onshore and offshore oil fields.Intelligent water injection technology can effectively improve the precision of stratified flow allocation and construction efficiency,make multiple reservoirs balanced water injection,and greatly improve the recovery efficiency of old oil fields.However,the existing technologies all use cables for downhole and surface data communication,and the cables are easy to be damaged during data transmission.The reliability and construction problems brought by long-span cables have been difficult to solve,which seriously affect the reliability of equipment,increase production costs,reduce work efficiency,and are an important reason restricting the scale application of this technology.Pressure pulse wireless data transmission can better solve the reliability and cost problems caused by cable.Using pressure pulse wireless data transmission can simplify downhole equipment,improve its reliability,and reduce installation costs.The wireless data transmission of pressure pulse has been applied in domestic oil field and verified by field test.The pressure wave generator is the key equipment,but the pulse transmission mechanism in the pipeline has not been studied in detail so as to provide guidelines for the design of the generator.In this paper,the mechanism of pressure pulse transmission in multiple parallel pipelines is studied to support the design of wellhead pressure wave generator.In this paper,the pressure wave pulse generator pipeline is designed,using three parallel pipelines,the main road and two branches are installed on the electronic control valve,valve can be electronically controlled opening and closing or manual opening and closing.By adjusting the valve opening of the two branches,the local loss and the loss along the way are controlled,and the appropriate pressure pulse is formed.The accurate and efficient regulation of the pulse amplitude is realized.The calculation method of pulse amplitude of parallel pipeline is established,the local resistance of valve and the resistance along the pipeline are investigated,the overall pressure loss model of pipeline is established,and the pulse amplitude of generator is calculated to provide support for the design of pulse generator.The pressure wave pulse generator and the pressure loss calculation model were verified,and the flow experiment device of the pressure wave generator test was designed.The pressure pulse was formed by the disturbance caused by the opening and closing of the valve.The amplitude-frequency characteristics of the pulse transmission could be investigated,and the theoretical model could be verified by integrating the experimental data,so as to provide design criteria for the development of applicable wireless data transmission technology.