Method for quantitatively calculating integrated risks of shaft integrity

Abstract

The invention discloses a comprehensive risk quantitative calculation method for wellbore integrity, which comprises the following steps: analyzing the form of wellbore failure, discussing the cause of failure, and studying the factors causing failure; analyzing the severity of wellbore integrity damage and grading; determining The probability of wellbore integrity damage induced by qualitative and uncertain factors; calculation of risk levels of evaluation factors; risk ranking of the possibility of occurrence of different wellbore integrity damage; comparison of the importance of indicators in the wellbore barrier risk factors; Matrix method for comprehensive risk assessment of wellbore integrity. The present invention has the advantages of: overcoming the limitations of only analyzing a single risk factor and relying on the professional experience of experts to determine the risk factor of wellbore integrity failure, it can better guide the identification and analysis of key risks of the wellbore, and reduce or eliminate potential safety hazards in time , to ensure wellbore safety during operation.

Description

technical field [0001] The invention relates to the technical field of oilfield safety production management, in particular to a quantitative calculation method for comprehensive risk of wellbore integrity. Background technique [0002] "Wellbore integrity" is defined as "the technical, operational and compositional measures that are in place to reduce production risks to ensure the safety of a well throughout its life". Wellbore integrity runs through the entire life cycle of oil and gas well design, drilling, oil testing, completion, production, workover, and disposal. The key technology is to ensure that effective barriers must be established at each stage of the well life cycle. During the entire life cycle of oil and gas wells, once the integrity fails, it may lead to serious or even catastrophic consequences such as leakage and blowout. Wellbore integrity evaluation is an important part of oil and gas field management. How to evaluate wellbore integrity reasonably, di...

AI Technical Summary

Problems solved by technology

For wellbore integrity risk assessment, qualitative analysis method is widely used at present, only relying on the professional experience of experts to determine the weight of wellbore integrity risk factors often has certain limitations; in addition, due to the randomness of wellbore integrity risk It is very difficult to evaluate the risk of wellbore integrity because of its complexity and complexity, and most scholars only study on a single factor, but seldom comprehensively evaluate multi-factor wellbore risks

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