The Probability Density Analysis Based On The Trajectory Error Of The Density Evolution Model

As now more old district development again,infilling,and deepwater drilling,the application of new well type of large displacement Wells,etc,the precision of trajectory problem again cause the attention of the researchers,are usually used in trajectory uncertainty model in the application of these conditions is not general,through the study found that most of the theory is based on the measurement section,or a single point of study,these theories are static,discontinuous,did not analyze drilling trajectory measurement in the process of status.For borehole trajectory error calculation method for the problem of uncertainty theory,the probability density evolution models in power system is applied in this article,and data in MATLAB simulation method to research on trajectory error are calculated,in order to get a more intuitive,which can diagnose the error of conditions while drilling trajectory errors analysis model.This article first cause of the error of measurement of borehole trajectory is analyzed,and identified the main error factors,based on the research purpose,after to quantify the selected error sources and synthesis,in order to determine the limit error amount as (?),quantity is established based on the limit error after an error ellipse trajectory error model of the loop,and established the joint probability density function,the application of density evolution method with the drilling of limit condition of research trajectory errors,and this method is compared with the commonly used crash-proof analysis method,Comparison results show that the limit error analysis method is commonly used trajectory error analysis method is more intuitive to show the instruments on the fixed interval error produced by the situation,make on-site construction personnel could be analyzed with the drilling track quality state.This paper set up a new path error model,and the limit is obtained based on trajectory error model trajectory error probability density model,apply it to the analysis of crash-proof,calculated the method meets the requirement of site construction.