ANALISIS TEGANGAN DAN REGANGAN PADA RANGKAIAN TUBING WORKOVER YANG DIBERIKAN OVERPULL MAKSIMAL SAAT KONDISI STUCK MENGGUNAKAN SOFTWARE METODE ELEMEN HINGGA

Abstract

Stuck conditions are one of the problems that often occur in oil and gas industry drilling and workover operations. This problem can be caused by the presence of something in the well that is holding back the drilling/workover string, such as compacted formation sand or bad casing conditions. One way to overcome a stuck condition is to provide maximum overpull. Maximum overpull is the maximum tensile force applied to a series of workover tubing without causing plastic deformation. In this practical work, using stress and strain analysis on a series of workover tubing which is given maximum overpull when stuck. The analysis was carried out by simple simulation using finite element method software. This analysis shows that the stress value in the simulation using software is 30,78 kpsi, while the stress value in manual (theoretical) calculations is 30,77 kpsi. The result of strain analysis in simulations using software is 0,001, while the strain value in manual (theoretical) calculations is 0,0011. The results of the analysis of displacement in simulations using software were 0,40 in, while the value of displacement in manual (theoretical) calculations was 0,396 in. After that, the results of the simple simulation were compared with manual (theoretical) calculations. From the results of the simulation and theoretical comparison, it was found that the deviation/error was 0,03 % for stress, -10 % for strain, and 1 % for displacement, which illustrates that the Finite Element Method simulation model is quite close to the results of manual (theoretical) calculations.