PSI - Issue 36
Teodoziia Yatsyshyn et al. / Procedia Structural Integrity 36 (2022) 362–369 Teodoziia Yatsyshyn, Myroslava Polutrenko, Lubomyr Poberezhny et al./ Structural Integrity Procedia 00 (2021) 000 – 000
365
prevent critical and emergency situations and impacts that pose a threat to environmental safety. The probability of occurrence and consequences of the impact of such situations, conditions and factors are due to random and chaotic processes, which by the mechanisms of influence can be described as risks (Kendall and Kendall (2011)).
Table 2. Risk factors at stages of life cycle of an oil and gas well
Risk factors
Technological
Qualitative and (or) wearing out (long term of operation)
Life cycle stages of oil and gas well
№
Unsealing of drilling
Human (wrong
rockfall
Faults in
Unsealing of wellhead
decision-making) Presence of
equipment
equipment
equipment
aggressive
substances
High pressures
1
Design of technical and technological projects Drilling rig installment
+
+
+
+
+
+
2 3 4 5
+ + + +
Drilling of the well The trial of the well
+ + +
+ +
+ +
+ +
+
The dismantlement of the drilling rig
6
Operating installment
equipment
+
7 8 9
Well development
+ + + +
+ + + +
+ +
+ + + +
Operation
+ + +
Operation close-out
10
Taking the well out of operation Technical maintenance and repair works
11
+
+
+
+
12
Complications emergencies
and
+
+
+
+
The main task of system analysis of multifactorial risks is as follows: { } where M0 is the set of risk factors, ρq is the risk factor. Each risk factor characterizes the set Lq features lqj: Each feature l_qj ∈ L_q is determined by the information vector: { } ; Based on the sets Lqj for each risk factor ρq form an information vector: { } { } [ ] . { } [ ]
(2)
(3)
(4)
(5)
(6)
{ } The set M0 corresponds to a certain a priori predicted set S0 of risk situations. In the process of functioning of a
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