The Development Of System Of Monitoring And Analyzing Of Cementing Operation In Real Time

With the further exploration and development for oil and gas in our country, drilling and well completion technology continues to progress and development, the exploration and development turns to deeper strata and more complex formation. The number of deep and ultra deep wells and complex wells and the wells with special techniques are increasing, the difficulty of cementing quality protection is growing, and requirement for the construction of cementing is higher. In order to protect the cementing security and improve the quality of cementing, science cementing operations is necessary. The construction of cementing should be monitoring and analyzing in real time which can master the conditions in the hole and adjust the cementing construction program in time to promote the safety, quality, efficiency cementing.Monitoring the wellhead pressure, fluid flow and fluid density through TCP/IP communication protocol. And digital filtering method is using for data processing and showing in the forms of curves and the instrument panel in the interface finally. Then, the process of the parameters of cementing monitoring is competed. Combining the parameters obtained by monitoring with the data of actual wellbore conditions, the fluid could be section by the fluid amount of injected into the hole real-time. The bingham, power law, H-B and various rheological model are described the rheological model of fluid into the well, and selected the most suitable for describing the rheological model of fluid into the well. Reasonable rheological model is established. Combining the fluid segment completed with the corresponding rheological parameters and calculation model under the condition of actual annulus friction pressure drop, the friction pressure drop of all sections could be calculated and building the pressure loss calculation model of construction process of cementing fluid. Consider the "U-tube" effect which may occur due to fluid pressure in cementing construction process, combining with the relevant calculation fluid mechanics and mathematical iteration method to establish cementing a mathematical model for calculating dynamic parameters of the hole construction process to calculate the cementing dynamic parameters such as the real fluid flow rate, liquid column length of the fluid, the fluid position, level of the vacuum section height, flow state in attention point and annulus pressure cementing dynamic parameters to complete the process of cementing construction parameter analysis.Considering everal mathematical models which can describe dynamic parameters of cementing in the hole, the author use Visual C#programming language to develop a "System of monitoring and analyzing of cementing operation in real time" based on Visual Studio2010and SQL Server2008database development platform. Its features are as follows:completely data processing, accurately computing, timely alarming, conveniently operating, simple interface and smoothly running. The system consists of six modules which are basic cementing data input, casing strength check and design, calculating cementing fluid dosage and slurry design, cementing fluid rheological design, cementing simulation, real-time monitoring, cementing analysis and report output of six functional modules. What’s more, dynamic curve display of the calculating result is the bright spot of the system. After successful laboratory test, field tests on some wells of Liaohe Oilfield in western sag, Liaohe Basin, indicate that it has achieved excellent effect. It performs not only on design and simulation of the cementing operation well, but also the ability to complete the wellhead pressure, flow and density in real time monitoring and calculating on analysis of dynamic parameters. The system also can response rapidly to accidents that may occur and alarms in time in the hole. Comparing the wellhead pressure and pressure curves, we can conclude that similar trends can be seen and it can meet to the needs for project on error, which is of an important guiding significance for the smooth construction of the cementing.The system makes cementing take a big stride forward to transparency, scientific and digitalization. Not only can it improve the operation and quality of cementing, but also is the core technology for improving cementing.