Optimizing productivity in oil rims: simulation studies on horizontal well placement under simultaneous oil and gas prod
- PDF / 3,869,601 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 47 Downloads / 155 Views
ORIGINAL PAPER-PRODUCTION GEOPHYSICS
Optimizing productivity in oil rims: simulation studies on horizontal well placement under simultaneous oil and gas production Oluwasanmi Olabode1 · Sunday Isehunwa2 · Oyinkepreye Orodu1 · Daniel Ake1 Received: 30 July 2020 / Accepted: 6 October 2020 © The Author(s) 2020
Abstract Thin oil rim reservoirs are predominantly those with pay thickness of less than 100 ft. Oil production challenges arise due to the nature of the gas cap and aquifer in such reservoirs and well placement with respect to the fluid contacts. Case studies of oil rim reservoir and operational properties from the Niger-Delta region are used to build classic synthetic oil rim models with different reservoir parameters using a design of experiment. The black oil simulation model of the ECLIPSE software is activated with additional reservoir properties and subsequently initialized to estimate initial oil and gas in place. To optimize hydrocarbon production, 2 horizontal wells are initiated, each to concurrently produce oil and gas. Well placements of (0.5 ft., 0.25 ft. and 0.75 ft.) are made with respect to the pay thickness and then to the fluid contacts. The results show that for oil rim with bigger aquifers, an oil recovery of 8.3% is expected when horizontal wells are placed at 0.75 ft. of the pay thickness away from the gas oil contact, 8.1% oil recovery in oil rims with larger gas caps with completions at 0.75 ft. of the pay zone from the gas oil contacts, 6% oil recovery with relatively small gas caps and aquifer and 9.3% from oil rims with large gas caps and aquifers, with completions at mid-stream of the pay zone. Keywords Well placement · Oil recovery · Horizontal well · Reservoir simulation · Concurrent production Abbreviations WOC Water oil contact GOC Gas oil contact HWL Horizontal well length Krw Water relative permeabilty WOPR Well oil production rate WGPT Well gas production total FOE Field oil efficiency WWCT Well water cut SGFN Gas saturation function GOR Gas oil ratio BHP Bottom hole pressure IOIP Initial oil in place GIIP Gas initially in place PVTG Properties of wet gas with vaporized oil PVTO Properties of live oil with dissolved gas
* Oluwasanmi Olabode [email protected] 1
Department of Petroleum Engineering, Covenant University, Ota, Ogun State, Nigeria
Department of Petroleum Engineering, University of Ibadan, Ibadan, Oyo State, Nigeria
2
SWFN Water saturation function SOF3 Oil saturation function
Introduction The peculiarity of thin oil rim reservoirs irrespective of the depletion strategies used as described by Masoudi (2013) is such that at onset of production high water cuts and gas oil ratios are experienced. This is due to the nature of oil rim reservoirs with gas caps and aquifers larger in volume and size than the oil rim. Although Olabode et al. (2019) had developed a numerical method to predict post water and gas coning, this method is not sufficient enough as it did not incorporate oil rim parameters. Thus, optimizi
Data Loading...
