The Bekapai field is located in the Mahakam Block Island of Borneo, East Kalimantan Province of Indonesia. The initial development for the field started in 1974 mainly from Oil Rim main zone with the reservoir layer consist from mouth bar to distributed channels. The production from the shallow zone always been seen as an operational hazard, but to boost the company production the shallow zone reservoir also start being targeted since the late 80's. These reservoirs mainly consist of unconsolidated sands with layer from distributary and fluival channel. Weak consolidated sands properties are found between depth 900 mSS – 1900 mSS (Figure 1), with sand size distribution variation is quite wide poorly to completely unconsolidated in their native environment. As the average porosity is ~ 20-30% with shale content can be as high to 60% in the distributed zones. Typically 3 to 10 zones sand prone zones are distributed throughout this interval length, it is necessary to deploy reliable sand control method in the most time efficient way. In addition, proper sand control placement into the wellbore could reduce the risk damage to the production facility during well life, damage to completion jewelry and ensure economic recovery of hydrocarbon. An analysis of the sand control technique in lower and upper zone reservoir revealed that the in situ sand control gravel pack method with Single Trip Multi Zone (MZST) especially in other field in Mahakam block was considered one of the effective sand control solution, since the shallow reservoir had strong aquifer support as stated in figure 1 thus prone to sand breakthrough. The MZST system can be used to perform gravel-pack from 1-6 zones in one trip while providing complete isolation between zones with the same basic concept as with standard gravel pack crossover tool, with each zone is treated by moving the service tool to every zone of interest without the need to change/pull out the service tool Over the past 15 years, MZST completion has been deployed for ± 250 wells delivering ± 700 zones. MZST has been proven to save three to six rig days compared to stacked gravel pack system with the ability to capture short reservoir intervals that would give difficulties to other completion system.
Bogianto et al. (Mon,) studied this question.