Leakage monitoring device and method for oilfield water injection system

Abstract

The invention discloses a leakage monitoring device and method for an oilfield water injection system. One inlet flow transmitter is mounted at a water inlet of each water injection pump, one automatic valve is arranged at each water outlet of a field manifold to control connection and disconnection of water in a water injection main line, each branch flow transmitter is connected with multiple single-well pipelines, and an automatic flow controller and a pressure transmitter are mounted on each single-well pipeline; an RTU and a DTU are arranged between each water injection station and each water distribution chamber, the inlet flow transmitters, the automatic valves, the branch flow transmitters, the automatic flow controllers and the pressure transmitters are in wired or wireless communication connection with RTUs, the RTUs and the DTUs are in communication connection, and the DTUs and an SCADA system server form a data communication subnet through a mobile data network and a router. The technical scheme provided by the invention can timely discover leakage of the oilfield water injection system, give alarms and timely cope with leakage.

Description

technical field [0001] The invention relates to the technical field of oilfield pipeline monitoring, in particular to a leakage monitoring device and method for an oilfield water injection system. Background technique [0002] Oilfield water injection is one of the important means to replenish energy to the formation, achieve high and stable production, and improve oil recovery during oilfield development. However, due to high water injection pressure, corrosion of pipe network, equipment aging and early failure, water injection system leakage often occurs. If it is not found and disposed of in time, it will not only waste water and damage the environment, but also seriously injure nearby personnel and wash away The foundations of roads, houses, and bridges may wash away the water injection well formation, causing catastrophic accidents. Although all major oilfields have completed or are completing the automation or information monitoring transformation of water injection p...

AI Technical Summary

Problems solved by technology

However, due to high water injection pressure, corrosion of pipe network, equipment aging and early failure, water injection system leakage often occurs. If it is not found and disposed of in time, it will not only waste water and damage the environment, but also seriously injure nearby personnel and wash away Foundations of roads, houses, bridges or flooded injection well formations, causing catastrophic accidents

Although all major oilfields have completed or are completing the automation or information monitoring transformation of water injection production, and have implemented remote data monitoring and automatic flow adjustment for water injection pressure and flow, there is no effective way to automatically detect the leakage of the water injection system in time , Alarm and automatic emergency response, still have to rely on manual monitoring and analysis to find the monitoring point of abnormal data, and then notify the manual patrol line to find the leak point or go to the monitoring point for further diagnosis to determine the leaking pipeline and close the upper valve, and finally repair

Due to the fact that the water injection pipe network is branched and the distance is different, there are indication errors of different instruments, the fluctuation of water injection pressure and flow and the fluctuations are not synchronized at each monitoring point or maintain a fixed time difference, manually adjust the setting and equipment of single well injection volume The automatic steady flow adjustment is frequent, so the pressure and flow data fluctuations are interrelated and have no fixed rules. From the single pressure or flow monitoring data, it is difficult for ordinary monitoring personnel to accurately determine whether there is water leakage directly from the monitoring data; on the other hand, many pipelines are Buried underground or even covered with hard cement, the leak point is not easy to be found in time, so misjudgment, misdirection, and delay in disposal lead to frequent incidents that lead to the expansion of the situation, which wastes a lot of manpower and financial resources, and also affects production.

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