Revitalising Low Contrast Viscosities Between Oil and Water ReservoirUsing Autonomous Inflow Control Device AICD Completion Strategy

摘要

To control and equalize the horizontal well drawdown, Autonomous Inflow Control Device (AICD) areplanned to be installed along the homogenous reservoirs in five infill wells at B field, Sarawak offshore(Malaysia). The very low viscosity contrast between oil and water (0.6cp and 0.5cp) with 37API degreeat B gives unfavorable mobility ratio and water flows with a higher velocity than the oil. This paperpresents the interdisciplinary approach to completion design needs which evaluated the efficiency andperformance between conventional completions compared with passive inflow control device (ICD), AICDnamely Rate Control Production (RCP) and Fluidic Diode to qualify the representative technologies foruse at B fields. The very purpose of this flow control device is the extension of well life due to defermentof water and/or gas production prior to water and/or gas breakthrough occurs. Flow performance testsare used to measure the performance of these various flow control devices at representative downholeconditions. The comparative analysis was primarily based on elapsed time comparisons for water/oil ratio(WOR), gas/oil ratio and water cut and sensitivity to historical drawdown, productivity index and productioncumulative performance. To reduce formation damage and screen plugging effect in these horizontal section,appropriate fluid conditioning, fluid displacement, filter cake breaker system and compatibility betweenscreen and the fluid in which the bottom hole assembly (BHA) will be deployed are discussed in this paper.The gas-water-control completion using AICD technology is predicted to provide significant benefit duringthe field development with incremental oil recovery around 10-40%, allowing well production with lowwater and gas production.