Design Optimization of Slotted Liner Completions in Horizontal Wells of Mumbai High Field

Abstract

Abstract An efficient and cost-effective completion is very critical in the mature brownfield of Mumbai High. Horizontal and multilateral wells are strategic completions in this oil reservoir because of their high productivity and larger drainage area. This paper deals with design optimization of slotted liner for horizontal wells in Mumbai High field of India. A good horizontal completion must maintain the mechanical integrity of the wellbore without posing a significant flow restriction. In this respect, slotted and perforated liners are cost effective solutions in horizontal wells because they provide uniform reservoir drainage, wellbore stability and control of solid production. A slotted liner completion is preferred, because it results in better solid control and lesser flow convergence. However, the compounded effect of formation heterogeneity and formation damage on pressure loss is severe in these completions. A good design is essential to minimize pressure loss due to flow restrictions and to maintain the long term productivity of well. The major challenge is to have an optimum slot size and geometry that minimizes slot plugging and near wellbore flow convergence losses. A keystone slot design with consideration for convergence loss is arrived to address this problem. The effect of parameters such as slot size and slot density on flow convergence pressure loss was taken into account for design optimization. This paper covers the design, optimization and application of slotted liner completions with an objective to address solid control, completion economics, well productivity and long term well performance.