A Comprehensive Approach to Well-Integrity Management in Adma-Opco

Abstract

The last few years have seen a renewed emphasis on Well Integrity (WI) worldwide, and ADMA-OPCO in particular. ADMA operates, more than 600 wells, in two offshore fields, which include oil producers, water injectors, gas producers/injectors and observation wells. A dedicated team was setup to focus entirely on WI and related issues. The team was given the objective to achieve the following. The team used a comprehensive and novel approach for handling this project. This paper is a case study of the methodology adopted by the team to achieve this task. Since the main objective was to risk review and rank the entire well stock, a dedicated risk-ranking process was designed, which served as an automatic guide to risk review and ranking of wells. The industry Risk Ranking matrix was modified to make it more objective and easy to use. It soon became obvious that risk evaluation of wells was only possible based on availability of good data organized in a user-friendly format. A dedicated database was setup in parallel with other activities. The web-based database was designed to contain all the data required for WI review of any well and is capable of tracking well integrity related tasks automatically. Well Integrity data included well construction, annuli pressures, production, well intervention, etc. The data existed in the office files were promptly transferred into the database. The team made a strong effort towards building the capabilities to acquire missing WI data such as Annulus Leak Rates, Integrity Test Results, Wellhead and Xmas Tree status. Annulus leak rate measurement skid was designed and built, in-house. One-off contracts were established to hot tap blind-flanged annuli and to perform Xmas tree and wellhead inventory survey and cavity checking/testing. A completely new system of WI certification has also been established. So far, the team has successfully reviewed and risk ranked majority of the wells in the two assets of ADMA-OPCO. Introduction: Well integrity is a growing concern in the oil industry. Years of cheap oil had placed this aspect of the oilfields on a back burner. Oilfields, specially the bigger ones are maturing and presenting new challenges by way of risk management.

The Risk of Using Risk Matrices

“…For centuries people have speculated on how to improve decision making, and a formal approach to decision and risk analysis can be traced through the works of Bayes and Price (1763), Laplace (1902), Ramsey (1931), De Finetti (1931, 1937, von Neumann and Morgenstern (1944), Bernoulli (1954), and Savage (1954). Over the last several decades, important supporting fields have been integrated to provide a discipline, decision analysis, 11 with the objective of informing and supporting decision making in complex and uncertain environments (e.g., such as many of the risk-management decisions we face in the O&G industry).…”

Leakage Monitoring and Quantitative Prediction Model of Injection–Production String in an Underground Gas Storage Salt Cavern

“…Most studies focus on the relationship between the rise of the annular pressure and wellbore casing temperature with the leakage rate. SCANNELL, a Norwegian company, designed and manufactured an annular leakage rate measurement sled to realize the real-time detection of multiple annular leakage points at the wellhead and the calculation of the annular leakage rate based on annular pressure changes, which has been successfully applied in the field [17]. Wu et al proposed an algorithm for locating the leakage point of production strings based on the U-shaped tube principle and established a tool for predicting the location of tubing leakage under the continuous casing pressure of offshore gas wells based on the pressure difference and probability distribution [18].…”