Gray Correlation Analysis Method and Its Application in Drill Stem Failure in Oil and Gas Engineering

In oil and gas drilling engineering, drill stem failure is one of the most damaging factors. The failures of drill stem not only delay the drilling schedule and increase the drilling cost, but also bring an interruption to the drilling process. Regarding to the specific circumstances of drill stem failure, gray correlation analysis model of drill stem failure has been constructed in this article. It makes drill stem failure and gray correlation integrate well. With the application of this method, we can calculate the association of these factors to determine their influence grades, and then we can determine the major factors to drill stem failure. With the calculation of the field data in Hailaer Area, Daqing Oilfield, the essential reasons for the drill stem failure in the area is obtained. Then corresponding precautionary measures are pointed out to solve the very problems. Practice shows that the method provided in the article is feasible and the calculation results are reliable.