Evaluation of Fishbone Lateral Stimulation: A Simulation Study
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Fishbone stimulation was simulated using ECLIPSE 100 in autumn semester project, 2013. I used LGR (Local Grid Refinement) Options in ECLIPSE to emulate fishbone needles extending to reservoir for a single vertical well. It was concluded that fishbone stimulation could increase well productivity, reduce skin factor, and reduce potential water or gas coning. ECLIPSE simulation requires some simplification, as the nature of the software itself does not enable for flexible grid shape and size, two important requirements needed for near well bore simulation.BRILLIANT is designed to deal with several physical models calculated simultaneously in the fluid flow from reservoir to well bore. It utilizes flexible grid size and shape and claims to calculate fluid flow equation accurately and effectively. Recently, BRILLIANT is furtherly developed to be compatible with porosity flow option in reservoir (Darcy flow) and update the calculation stability algorithm. Accurate simulation result is expected from BRILLIANT detail simulation for fishbone case. The goal for this master thesis is to perform fishbone simulation using BRILLIANT and compare it with ECLIPSE simulation result. The case conducted in semester project will be simulated using the latest version of BRILLIANT. This comparison result determines direction of the research afterwards. In the case of insignificant difference of both simulation results, it would be confirmed that ECLIPSE could guarantee accurate result for well performance in fishbone stimulation case. In other words, it is unnecessary to simulate reservoir and near well bore details using BRILLIANT. However, different result between ECLIPSE and BRILLIANT simulation would divulge a good recommendation to use BRILLIANT simulation result as an input to ECLIPSE simulation. Result of this research is as follows. BRILLIANT and ECLIPSE simulation gives a different result for fishbone simulation case, thus it is required to upscale BRILLIANT as an input to correct ECLIPSE fishbone simulation. The upscaling technique in ECLIPSE could be conducted by two methods: permeability or skin modification, in order to match BRILLIANT simulation result. Furthermore, controllable and uncontrollable parameters are varied to quantify those effect to fishbone well performance. The parameters include fishbone needles number, fishbone annulus size, fishbone needle length, reservoir thickness, and reservoir heterogeneity. Fishbone stimulation is also compared with the existing conventional fracturing to analyze the most effective method for increasing well performance.