Reservoir Engineering Aspect of Well Construction for Cost Effective Field Development:Advances in Drainage Point Selection

摘要

It shall never be over-emphasized that the balance of cost and value is very crucial in determining the commercial feasibility of a field development or redevelopment project.The values are generated by wells that could fetch higher productivity and could effectively drain out larger reservoir hydrocarbon fluid volume.Well drilling and completion costs and their surface production supporting facilities costs have been steadily increasing in recent years.Subsurface engineering studies shall therefore also focus on optimizing the well placement and orientation,the well type and completion selection,the life-cycle control of well inflow and outflow,with the minimum well count to yield higher values. This paper entails various methodologies of selecting drainage and injection points by combining the remaining mobile oil,current productivity,and current pressure depletion maps constructed from history matched reservoir simulation models.Base on predominant drive mechanisms in the reservoirs studied, governing parameters were coupled in 3 property groups and normalized individually.A known heuristic approach was also adapted to construct a Simulated Opportunity Index(SOI)map.A correlation between the SOI and recoverable reserve(EUR)was established by simulation prediction runs for each drainage or injection point selected,sand by sand in the studied reservoirs.The studied reservoir cases including a vast thin oil-rim reservoir,a huge multiple stacked reservoir,a complex compartmentalized reservoir, and a prolific deep-water reservoir. Clustering the selected drainage and injection points in several sands to further maximize the well productivity,optimization of the inflow control for the selected commingled sands,and the design of cost effective completions,shall be addressed later sequentially in separate papers.