Field Development Plan by Optioneering Process Sensitive to Reservoir and Operational Constraints and Uncertainties

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA revised Field Development Plan (FDP) for Betty Field was prepared based on a process that was simultaneously sensitive to reservoir and operational constraints and uncertainties. This so called "Optioneering" process was an iterative, multidisciplinary optimization task that generated an action plan based on multiple options developed by reservoir, production, drilling and facilities engineering and ranked by economics. The process specifically involved first generating a series of unconstrained production options, which then considered drilling reach and anti-collision limitations, and finally had the appropriate facilities and regional evacuation constraints imposed. To achieve this, history-matched numerical reservoir models were first run within the framework of an infill well-location optimization software package. Then, drilling constraints were imposed with drilling planning software and facility constraints were included via a surface coupling system for multiple-reservoir models. Uncertainties in the reservoir characteristics and in the facilities/evacuation schemes were addressed by quantifying their impact on the ultimate recovery efficiency.During the optioneering exercise, more than 100 unconstrained options for seventeen stacked reservoirs were identified from the perspective of infill drilling, pressure maintenance by gas injection and/or waterflooding, high pressure gas production, horizontal wells and production enhancement work. Based on typical costs and economic rank, the high potential unconstrained production options for each reservoir were determined. After imposing the drilling constraints, all reservoirs were then coupled to account for 1 Now with Shell E&P 2 Now with Conoco Phillips surface facility constraints. In the final analysis, five sidetrack wells reaching 12 new drainage points (NDP) over 10 reservoirs were designed. This infill drilling scheme will increase current reserves by 128%. Furthermore, a gas injection scheme identified as the optimum plan for A6.0 reservoir will increase current reserves by 28%. Field wide recovery factor will be improved by 9%.

Synthetic Evaluation of Oilfield Development Plans Based on a Cloud Model

“…It plays a crucial role in the development to select an appropriate developing plan. 1,2 However, there always exist uncertainties when evaluating the development plans because of the limit, the subjectivity of human beings, and the uncertainties of the system itself. Thus, it is necessary to find a synthetic method to evaluate and optimize the oilfield development plans, which can deal with the uncertainties.…”

Integrated Study for Field Development Challenge of a Brown Field with Seven Stacked Reservoirs

“…Cullick et al 4 worked on development on optimal well locations by using automated well planner. Kasap et al 5 applied "Optioneering" process to arrive at an optimized FDP for an offshore field having multiply stacked, light oil, rim reservoirs.…”