Smart Completion Design With Internal Gas Lifting Proven Economical for an OilDevelopment Project

摘要

An oil acceleration project in an offshore oil field in BruneiShell requires two oil wells to produce oil via an existing 80bara (HHP) gas pipeline to a platform. Acceleration of the 2wells will result in:· Accelerated oil production from the oil rims.· Acquisition of additional reservoir data for furtherfield development optimization.This paper will discuss the technical details on the followingwork:· Evaluate the initial production against HHP (8 Mpa)in a commingled mode from 3 oil zones.· Internal gas mixing (lifting) using source gas from agas zone. The optimized gas injection rate, downholechoke size have been selected through modeling.· Completion designs for the two wells to realize thecommingled production with internal gas lifting andenable the evaluation and production testing of eachindividual zone for reservoir appraisal and reservoirmanagement purpose.A smart completion design was proposed. It comprises of:· Inflow Control Valves (ICV) for surface controllingof production from each zone,· Down-hole temperature and pressure gauges formonitoring each individual zone,· A hydraulically controlled down hole choke tocontrol the inflow of lifting gas from the gas zone.Based on the study, the range of choke sizes from2/64” to 60/64” was chosen,· Cased hole expandable sand screens (ESS) withextension pack and/or wire wrapped screens (WWS)in open hole sections for sand control,· All the control and monitoring can be conducted realtimeremotely to minimize the intervention in anunmanned platform.The intelligent design is a key enabling technology toeconomically produce small oil rims and maximize liquidrecovery, thereby increasing the value of the overall fielddevelopment. The project exceeded the group economiccriteria and has been approved.