Prabumulih Field was located in South Sumatra, Indonesia. It has been developed as an oil field since 1920n (It was categorized as a mature field). At the end of 2019, the amount of oil well production was 149 wells (93% of the producing wells installed artificial lifting). As a consequence, to maintain production, artificial lifting surveillance activities must be a major concern and be managed properly. However, there are some challenges for surveillance, for instance, the location of well spread over a large area, the condition of the access road, and limited human resources. Surveillance activity itself carried out manually required both much time and many human resources, however, acquired data was only once in a week for one well. That condition always emerged undesired occurrence because engineers who were in the headquarter did not obtain notification when producing wells were in trouble or suddenly off producing. In addition, there was a delay in time for evaluation and intervention, which resulted in decreased oil production. Nowadays, application, in order to accelerate the data retrieval process, was much needed, especially real-time acquisition and it could be monitored in several kinds of devices. This paper will be presented about the benefit of real-time monitoring application in mature field, especially for artificial lifting well (ESP and Rod Pump). It has been installed since December 2019. There were several benefits obtained after installing this technology, those were related to surveillance and optimization. For instance, reducing time and human resources needed to obtained pump parameter data, engineers who are in the headquarter could observe everyday using both laptop/personal computer and smartphone, engineers obtained notification immediately when there were wells in a trouble, decision making for optimization and or intervention was faster, increase pump run life, and reducing well service program. Besides, there was another benefit that related to cost reduction, for instance saving rig costs for well service of 350,578 USD in a year because the amount of well service decreased from 49 times to 36 times, and obtained additional gross revenue of 547,945 USD for one year (cost for real-time monitoring for a year is 116,438 USD) because production deferment reduced from 19,577 STB to 5,105 STB. Based on those data, real-time monitoring could increase the economic condition of the mature field, so it was worth applying in a mature field.
The evaluation of flow profile in the wellbore system is an important part of oil & gas field development. Leaks that occur in or behind the production casing is not only potentially causes safety and environmental issue but also potentially misjudgments of production performance analysis and the estimation of remaining reserve. The flow profile in the wellbore mostly affected by the life cycle of well during drilling phase, completion phase, production or injection phase and restoration phase. One of many well-known technologies applied in oil & gas industries is acoustic leak detection and pressure thermal log. The selection of surveillance technique to identify undesired water flow problem is not only provides more effective result but also carries an acceptable risk in term of the project cost. The objective of this paper is to show how a new approach of acoustic leak detection and pressure thermal surveillance can be used to increase the effectiveness of water shutoff operation in mature oil and gas field. The new approach of dynamic surveillance technique provided the acoustic, pressure and thermal data acquisition along the artificial lift wells can be interpreted. The case studies shows that the undesired water flow in or behind production casing can be identified precisely compared with a conventional method such as cement bond log. As the result, the data interpretation gives a remarkable result both of the successful water shutoff operation and post job production performance. Water significantly can be reduced from 1300 bbl per day to 320 bbl per day and the other hand oil & gas significantly can be increased from 34 boepd to 532 boepd. Moreover, this paper should be beneficial to help all petroleum engineers currently working in mature oilfield not only to identify undesired water flow problem precisely but also develop a comprehensive and effective water shutoff and remediation plan.
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