A Method for Evaluating Rock Drillability Using Element Content of Cuttings

Abstract

The invention provides a method for evaluating the rock drillability by using rock debris element contents, and relates to the field of geological exploration. The method is low in cost, simple and convenient to operate and high in real-time performance, and has important significance for drill bit selection, drilling parameter optimization and drilling cost reduction. The method for evaluating the rock drillability by using the rock debris element contents specifically comprises the steps of analyzing main chemical compositions and contents thereof of the rock, measuring chemical element compositions and contents thereof of drilling rock debris in an area to be measured, screening 10-12 elements which are most related with the lithology, drawing an element content and lithologic section of each stratum, and acquiring a curve variation diagram of a rock drillability grade value by using logging information; further screening out 7 elements related with the rock drillability from the above 10-12 elements according to the curve variation diagram, performing regression analysis according to the element content and drillability grade value data of the curve variation diagram, and acquiring a calculation model for evaluating the rock drillability.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to the field of underground resource drilling engineering, and in particular to a method for evaluating the drillability of rocks by using the element content of cuttings. Background technique [0002] With the development of rock mineralogy, rock mechanics and drilling technology, a variety of rock drillability representation methods and penetration rate equations have been proposed to study rock drillability. In conclusion, the methods for obtaining rock drillability mainly include There are two methods: one is the traditional method, which assumes that the research object is homogeneous and uses experimental methods to measure; the other method is the rapid development of mathematical statistics in recent years to determine the drillability of formation rocks. [0003] Specifically, the existing rock drillability evaluation methods are as follows: (1) indentation hardness me...

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Problems solved by technology

[0004] Although the above methods for predicting rock drillability have played a certain role in practical applications, the above methods still have some shortcomings, mainly because some methods require core samples, while some methods have lagging data and complex data processing , the cost is high and the rock drillability cannot be evaluated in real time. Therefore, among the existing rock drillability evaluation methods, a method for real-time evaluation of rock drillability is urgently needed

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