|Publisher||Society of Petroleum Engineers||Language||English|
|Content Type||Conference Paper|
|Title||Efficient Intelligent Well Cleanup using Downhole Monitoring|
D.K. Olowoleru, K.M. Muradov, F.T. Al-Khelaiwi and D.R. Davies; SPE, Heriot-Watt University, Edinburgh, U.K.
8th European Formation Damage Conference, 27-29 May 2009, Scheveningen, The Netherlands
2009. Society of Petroleum Engineers
|5.8 Fundamental Research in Production and Operations
5.7 Operations Management
1.6.1 Monitoring (Pressure, Temperature, Sonic, Nuclear, Other)
Extensive modelling and simulation work has been previously performed analysing the impact of formation damage and well cleanup in horizontal wells. This paper extends that work to advanced completions employing Interval Control Valves (ICVs) and Inflow Control Devices (ICDs). It reports a comparative study that illustrates the greater cleanup efficiency of advanced, long horizontal well completions over that achieved by the equivalent, conventional, openhole completion.
The highest cleanup efficiency is predicted to be achieved by an intelligent completion employing both sensors and ICVs. The well’s full production potential will only be realised if a proper, real-time, cleanup monitoring and control procedure is implemented to optimise the choking strategy. Only then will the near wellbore cleanup efficiency be maximised. A dynamic well simulator has been used to illustrate the advantages of employing such a proper, real-time, cleanup monitoring and choke control strategy. This only becomes possible if an intelligent completion is employed. Sensitivity analysis is used to illustrate how an ICV completion gave the highest cleanup efficiency for almost all the parameters studied.
The single zone cleanup strategy employed by an intelligent completion requires that extra time be spent on the initial stages of the cleanup process. Guidelines are required to ensure economic as well as technical optimisation of the cleanup process. This can be achieved by use of the presented, practical downhole monitoring procedures for efficient well cleanup together with a novel procedure for identifying the time when the near wellbore region is sufficiently clean.
Intelligent wells add additional value by providing more effective cleanup than conventional ones. Subdividing the total producing length into a number of zones which are opened successively during the well start-up period is a field proven practice that maximises the drawdown to a particular zone and minimises the chance of flow conduit blockage by deposition of produced sand. The increased drawdown created by unloading the separate well zones sequentially leads to more effective formation cleaning. This temporary zonation of the wellbore can be achieved with specially pre-installed devices (e.g. clean-out or sandface valves).
Real-time, downhole pressure data can be used to ensure that the flowing bottomhole pressure is kept above the sand production limit6. Intelligent wells break the completion into a number of zones with downhole valves while their multiple gauges can be used to control and monitor the zonal production. They also have the additional capability of optimizing the cleanup operation.
This paper will first discuss the processes that cause formation damage in the near wellbore area due to drilling and completion fluids. We will then compare the conventional well’s success in cleaning up this damage with that of an advanced well completed with either Interval Control Valves (ICVs) or Inflow Control Devices (ICDs). Finally we will develop recommendations for improved cleaning techniques.
|File Size||284 KB||14|