Research On Real-time Optimization Analysis Method Of Drilling Parameters

In the process of drilling,the real-time optimization of drilling parameters can effectively solve the the low rate of penertration which is caused by exerting improper drilling parameters and serious bit wear.It is one of the important means to implement the low cost and high benefit drilling. At present,the main method of realizing the real-time optimization of drilling parameters is timely adjusting the driliing parameters based on the shape of the mechanical specific energy curve to realize the optimization of drilling rate.Although this method can come true the real-time optimization of drilling parameters,it can't timely provide the combination of the optimal drilling parameters,is also unable to realize the optimization of drilling cost.Using the traditional drilling parameters optimization method maybe exist the following problems to optimize the drilling parameters timely.(1) these models in the traditional parameters optimization methods cannot be duly build by the drilling data.(2) the drilling bit wear is not impossible to achieve accurate and real-time assessment.(3) Traditional parameter optimization method is mainly for rock bit model,do not apply to the PDC bit.Therefore,this paper has carried out the following research to aim at the question of trational parameter optimization method in real-time optimization of drilling parameters.Amending the traditional PDC drilling rate model is by bit wear.Using the multiple regression method realizes to buid the PDC drilling rate model timely.By example verification,the predicted drilling speed ratio using the adjusted PDC drilling rate model is more close to the actual drilling rate than the unadjusted PDC drilling rate model.It proves that the revised PDC drilling rate model can more accurately predict the mechanical drilling rate and response downhole working conditions;the model is build to timely forecast bit wear extent According to the principle of mutual transformation between bit wear extent and bit cumulative penetration.the way which real-time forecast bit wear extent by the drilling data is designed.It proves that this model can accurately reflect of the wear of PDC bit by the example.The model can solve the problem that trational method need to be up a bit.The modified young drilling rate equation is ragarded as the drilling rate model of rock bit.Using Davidon-Fletcher-Powell algorithm establish duly the rock bit drilling rate model. By example verification,the coincidence rate between the drilling by DFP algorithm real-time predicting and the actual drilling rate is above 80%.This way can reach the engineering requirements.According to the real-time model of rock bit and PDC bit drilling rate and drilling bit wear model parameters in real time optimization objective function, using Lagrange multiplier method to realize the rock bit and PDC bit drilling parameters in real time optimization, real time solution of the optimal parameter combination.Forming a set of the real-time optimization method of drilling parameters which use the drilling data by the above research. Using SQL Server 2008 database platform and Visual Studio 2010 programming software is designed and developed a set of "drilling parameters real-time optimization analysis system"which is comprehensive logging data and site construction parameters as the main data source.Operating and exampleing the software by using the comprehensive logging data of KH1 well and DX1431 well.The analysis results consistent with the actual situation.The result reflect that the real-time optimization method of drilling parameter can guid he real-time optimization of drilling construction,implement low cost,high benefit drilling.