Method, device and system for evaluating risk of insufficient borehole cleaning

Abstract

The invention discloses a method, device and system for evaluating the risk of insufficient borehole cleaning, and the method comprises the steps: obtaining the actual measurement pressure of a plurality of measurement points on a wellbore, and obtaining the actual measurement pressure drop of two adjacent measurement points on the wellbore according to the actual measurement pressure of each measurement point; obtaining the theoretical pressure drop of two adjacent measuring points on the shaft; and according to the theoretical pressure drop and the actually measured pressure drop of the two adjacent measuring points on the wellbore, the risk of insufficient borehole cleaning is judged. The method has the advantages that the theoretical pressure drop between every two adjacent measuring points on the shaft comprises the pressure drop caused by the friction effect and the pressure drop caused by hydrostatic pressure, but the pressure drop in a well hole can be obviously changed by suspended rock debris in actual drilling fluid. And if a large amount of rock debris exists, the calculated theoretical pressure drop and the actually measured pressure drop have obvious difference, so that the relationship between the theoretical pressure drop and the actually measured pressure drop can be compared to evaluate the underground borehole cleaning condition and judge the risk of insufficient borehole cleaning.

Description

technical field [0001] The invention relates to the technical field of drilling engineering, in particular to a method, device and system for assessing the risk of insufficient wellbore cleaning. Background technique [0002] Insufficient wellbore cleaning is one of the main problems in drilling safety prevention and accident warning (please refer to the Chinese invention patent with application number CN201910119287.2). The accumulation of cuttings bed in any well section will easily cause problems such as excessive friction torque of drilling tools, pressure loss of drill bit, low ROP, and even serious downhole accidents such as pipe sticking and wellbore filling. For real-time downhole condition monitoring, the main challenge is the uncertainty of the input parameters of the drilling model. The uncertainty between these parameters will increase with the increase of the well depth, and even the accuracy of the drilling calculation model may be significantly reduced. . ...

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Problems solved by technology

[0004] In view of this, it is necessary to provide a method, device and system for assessing the risk of insufficient wellbore cleaning to solve the problem in the prior art that it is difficult to obtain the concentration of suspended cuttings in the drilling fluid, which makes it difficult to judge the wellbore Technical aspects of the risk of inadequate eye cleaning

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