Brownfield in Balingian and Baram Delta have handful of idle wells and well to be abandoned in their inventories. The project aims to reduce the idle well inventories and support production gain through monetizing behind casing opportunities. The target is to appraise and develop LRLC potentials with lower cost of appraisals. This will maximize full field potentials before abandonment and leads to future development of LRLC opportunities as conventional reservoir becomes more difficult to develop. The idle well inventory has grew up due to problem in production (increase water cut, HGOR) and well problems (sand, fish). An order has been introduced to reduce the idle well list up to 50%. Additionally, in the past, the LRLC intervals were often ignored and considered as water-wet sands due to high water saturation or as tight sands. These intervals, that contain significant reserves, are recognized in many technical papers explaining its identification and evaluation techniques from well-data (logs and samples/cores). The scope of the project is to rejuvenate the idle wells by add-perf LRLC reservoirs. It is impossible to achieve the target without the presence of proper and improved LRLC BCO evaluation process, thus an integrated workflow approach (between Petrophysicist, Reservoir Engineer, Production Technologist, Asset manager & Well Intervention group) has been developed and applied in the project. A new evaluation tools had also been developed called REM (Resolution Enhanced Modelling) in order to improve the log properties of LRLC reservoirs so that the data obtained from old conventional tools can still be used to evaluate LRLC reservoir. Although LRLC is termed UNSEEN, the risk is reduced by proper understanding of hydrocarbon column and sand development. To date, 7 fields are already benefitted from this approach. Field A LRLC reservoir for example has tripled the hydrocarbon saturation, and net to gross has improved to 20% using REM compare to 5% without REM. The other 6 fields are also gaining the same increase in the properties. This has resulted in a cumulative potential of 4.4 MMstb of reserves addition and ~11 KBopd potential gain. As a result, a better and attractive BCO proposals can be generated from LRLC opportunities. The exercise will provide the company with cheaper options of appraising and developing LRLC reservoir while reducing the idle wells. There is no better way of understanding LRLC reservoir; as no tools can identify & quantify it yet, rather from the actual production.
Exploration and production companies in the South China Sea region have focused increasing attention on basement reservoirs. In the current study, a modest step was to taken to identify the fracture pattern and its associated physical properties, which help provide the potential zone of the formation sampling and pressure gradient analysis. An exploratory well located offshore Sarawak, Malaysia recently encountered oil in the meta-sediment basement-confirming the basement plays in this region.Borehole microresistivity images and acoustic data with background geology characterized rock texture, lithofacies, and fracture network. Integration of sidewall core and microresistivity image data characterized litho-units having complex architecture. Open fracture zones were validated in images and acoustic logs. Borehole image-derived fracture properties calibrated with sonic-derived results were used to estimate gross voidage. Average porosity in fractured basement rock is usually low; hence, fracture transitivity/permeability is important for estimating fluid movement. To characterize basement rock, fractural properties and geometry, such as permeability, aperture, density, and flow potential, should be attributed properly with respect to the different facies association present.The exploratory well was mainly drilled through the quartzite and phyllite section. Microresistivity image data helped decipher the different texture patterns with the two litho-units and also identify the internal structural features associated with each. The major types of structural features were identified, including partial fracture, open fracture, and closed fracture. Statistical analysis showed the major strike orientation for the open fracture was toward the NW-SE; whereas, the minor trend was NNE-SSW with a mean dip of 45°magnitude. Partial fractures also exhibited a similar trend, with the major strike NNE-SSW and minor trend NW-SE with mean dips of 52°magnitude. Average open fracture aperture was determined to be in the range of 0.2 to 0.4 mm, with an approximate secondary porosity range between 2 to 3% and permeability of 0.01 md.This was the first integrated approach for evaluating a meta-sediments basement in the offshore Sarawak area. This methodology emphasized advanced integration and is essential for evaluating such complex reservoirs, providing a stepping stone for future well trajectory planning in the study area.
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