RISK REDUCTION IN WELL FLOW LINES BASED ON EARLY DIAGNOSIS OF COMPLICATIONS
Creators: name: Ismayilov, Ramiz
name: Rugiya Asgerova
Publisher: name: Reliability: Theory & Applications
Year: 2024
Subjects: flow lines
risk analysis
diagnosis of complications
gas factor
line productivity

description: The reliability of the system for collecting products from oil, gas and gas condensate fields directly depends on the condition of the well flow lines. Many years of experience in the exploitation of offshore fields in the Azerbaijani sector of the Caspian Sea shows that various kinds of complications arise in the flow lines of wells associated with salt deposits, asphalt base, tarry oil and paraffin deposits, fluid accumulation, pressure pulsations, etc. The listed complications lead to the formation of blockages in the flow lines, an increase in the mechanical load on the equipment and, ultimately, to a decrease in the productivity of lines and wells, up to the point of stopping their operation. Work to restore these lines takes quite a long time and requires significant costs. Reducing technological risks in the operation of well flow lines is closely related to diagnosing their condition. But planned diagnostic work involving forces and equipment often in practice reveals complications at a late stage of their development and engineering decisions are made to shut down wells and restore lines. In connection with the above, the issues of diagnosing complications at an early stage of their formation acquire current and practical importance. Timely cleaning of flow lines and regulation of operating conditions of production wells, such as the selection of an adequate wellhead pressure regime and other technological solutions, can prevent a negative scenario for the development of complications. In turn, for early diagnosis of complications it is necessary to find a diagnostic criterion. determining the beginning of their formation. Due to the fact that the main flow parameters at the metering nodes are continuously recorded in real time, it would be advisable to develop an appropriate diagnostic criterion based on the results of studying the dynamics of time series for the main indicators of flow lines. For this purpose, in this work, flow lines of wells in the Bulla-Deniz field (Azerbaijan) were studied. The main indicators for the studied lines were length and diameter, pressure at the beginning and end of the line, gas factor and line productivity. Based on these indicators, data processing was carried out and corresponding statistical estimates were obtained. The results of the analysis revealed a stable correlation between gas factor indicators and flow line performance. It was established that a sharp decrease in line productivity with an increase in the gas factor manifested itself in wells in which restoration work was carried out due to complications that arose. This makes it possible to use this behavior of the curves of the dependence of flow line productivity on the gas factor as a criterion for diagnosing complications at an early stage of their formation. The results of this research can be recommended for use in the operation of a system for collecting and transporting oil and gas field products.