Risk assessment of aging offshore jacket platform group: a case study on “B” Field platforms

Abstract

Offshore jacket platforms are designed to fulfil their intended purpose in oil and gas exploitation at designated service life periods. During the operational development, a number of field operators extend their platform service life if the reserves are still available. This technical paper proposes the method to assess the structural integrity of several aging platforms in a field with a simplified approach. Taking the case of “B” Field platforms installed in the mid-1990s, the detailed procedure and example are discussed thoroughly. Five indicators furnished with quantification procedures are also presented to propose the ranking methodology. This paper also proposes the method of jacket platforms grouping based on several similarity criteria. The results of this approach can be used as a baseline for more detailed structural integrity assessment for each group representation.

Mooring Analysis of Ocean FarmITS (OFITS)

“…In order to make operations more secure, it is necessary to conduct a risk assessment study that allows the most severe structures from each group to be assessed further for finite element analysis [15]. It is necessary to conduct studies on fish conditions due to stress during the acclimation process, handling and transporting cultured fish, which can cause metabolic disorders [16].…”

Analisis Integritas Struktur Jacket Wellhead Platform Tiga Kaki Akibat Pengaruh Scouring

“…Meskipun penggerusan ini dapat diukur, kedalaman dan pola gerusannya sulit diukur dengan akurat [4]. Scouring cenderung meningkat seiring dengan peningkatan kecepatan arus, turbulensi, dan erodabilitas tanah.…”

“…𝑄 𝑑 = 𝑄 𝑓 + 𝑄 𝑝 = 𝑓𝐴 𝑠 + 𝑞𝐴 𝑝 (4) Hasil dari analisis pada bearing capacity adalah safety factor. Safety factor adalah batas aman pile dapat beroperasi.…”