The Delta Mahakam's geology is characterized by multiple layers of thin, heterogeneous reservoirs separated by a few meters. These wells are traditionally perforated with the conventional wireline method. However, at reservoir porosities less than 11%, perforations yielded less than 60% of flowing probability. With the increase in drilling activity and the number of reservoirs with low porosities, we began to evaluate the effectiveness of perforating these reservoirs with abrasive jets perforation conveyed on coiled tubing (CT).To improve depth accuracy and monitor real-time bottomhole conditions, the abrasive jet perforating tool was run on fiber-optic CT. Pressure measurements inside and outside the coiled tubing enabled the pumping rate of the abrasive fluid to be adjusted as necessary, improving perforating efficiency as well as the GR/CCL reading for the depth correlation.This abrasive perforation method was applied in six different wells in Delta Mahakam field; the design, execution, and evaluation of this method is presented. From the first well to the last, this alternative perforating strategy helped increase reservoir production, improve cost efficiency, and by adding the real time monitoring system on coiled tubing it is proved of reducing the operational time by up to 45%. This method proved to be a viable alternative to wireline-conveyed perforating in the Delta Mahakam field.

A natural phase in the life of oilfields is the maturation phase where the field undergoes all or some of situations as decline in pressure, increase in water and/or gas production, and fluid contact movement. Reservoir management practices require identifying these oilfield challenges and coming up with solutions to maximize production from such fields adapted to the uniqueness of the wells and reservoirs in the field. This paper discusses a novel multidisciplinary and rapid screening methodology for identifying well intervention candidates. The methodology adopted to evaluate production increase opportunities was on field and well bases. Geology, Petrophysics, Reservoir Engineering, Production Technology, Production Engineering and Completions Engineering disciplines were involved in this study. The field assessment started with the field production performance review using a production surveillance and forecasting tool. This was combined with a holistic field geological review of the static models and well logs on a shared-earth modelling software and a wellbore-centric data integration and interpretation software respectively. Based on the field assessment review, reservoirs were ranked based on remaining oil in place and cumulative production. Results of the field assessment were then fed into the single well assessment phase where individual well performance was reviewed using the production surveillance and forecasting software. This production surveillance and diagnosis was done vis-a-vis a multidisciplinary workflow of integrating reservoir models, well logs, fluid contact interpretations, pressure data, historical production, completion designs and information from previous workover operations and well surveillance reports. This workflow identified possible candidates where well intervention could be done, the type of well intervention and production enhancement operations that could be deployed, and the order to which the interventions should take place based on cost and potential gains. However, to estimate the incremental production that could be derived from the proposed well interventions, a workflow coupling single well predictive modelling and production systems analysis was done, which was further used to rank the wells. Implementing the recommendations from the rapid screening and ranking workflow resulted in incremental production of 3300 bopd from the few intervention operations executed. The results also validated the predictions made during the rapid screening study. This paper thus demonstrates the added value in a multidisciplinary approach to screening and identifying candidates for well intervention, to extend the life of producing wells and ultimately increase field production.