Quantitative Study on the Risk Level of Human Factor for Drilling Process

Abstract

In order to quantifying human factor initial risk level in drilling process, the types of work activities involved in drilling were identified, the major accident risk types of human errors were selected, the probability and severity levels of risks associated with each activity were quantified, and the human factor risk level of major work activities involved in drilling process were calculated. Quantitative results show that the relatively highest risk types during drilling process are struck by object (risk value is 3.9171 S/w-h), injury by machine (risk value is 2.8916 S/w-h), overexertion (risk value is 1.5091 S/w-h), etc. Contrarily, the relatively lowest risk types are exposure to harmful substances or environments (0.7379 S/w-h), fire and explosion (0.2750S/w-h), and othersi0.2261 S/w-h), etc. The relatively highest risk activities are associated with penetration drilling (risk value is 2.7475S/w-h), trip in and out (risk value is 2.0206 S/w-h), and hoisting and lifting operation (risk value is 1.7064 S/w-h), etc. Contrarily, the relatively lowest risk activities are auxiliary operations (risk value is 0.3706S/w-h), well logging and mud logging (risk value is 0.2059 S/w-h), equipment inspection and maintenance (risk value is 0.1510 S/w-h), etc. The total risk value of all main drilling activities is 11.3947 S/w-h.