Analysis on Measuring and Calculating Methods for Sticking Point of Stuck Drill String in Geological Drilling Hole

Abstract:

Sticking is one of the most frequent, time-consuming and the biggest loss accident in the geological hole drilling. In the sticking accident handling process, the location determination of sticking points is the key. At present, the determining methods of the sticking points of the drilling string in the geological drilling holes mainly are magnetic injection, direct use of magnetic locator, point measuring instrument and the formula calculation. This paper introduces the working principle and operation steps of the sticking point measuring method in detail, and compares and analyzes three measuring methods of the card points. This paper introduces the working principles and the operation steps of the sticking points measuring methods and makes analysis and comparison of these 3 methods. At the same time, the calculation formulas and operation steps of parameters determining for the single and compound pipe columns are given. It is found that the measuring instrument has high accuracy but with limitation as well as time-consuming and costly; the formula calculation is simple and easy but with low accuracy. Therefore, the measuring instrument and formula calculation should be combined in the field to determine the location of sticking point more quickly and accurately in order to reduce economic loss by effective measures.

Key words:geological drilling; drill string sticking; sticking points