Comprehensive Diagnostic and Water Shut-off in Open and Cased Hole Carbonate Horizontal Wells
- Hussain Al-Shabibi (Schlumberger) | Haji Nawawi Haji Ahmad (Saudi Aramco) | Murat Zeybek (Schlumberger) | Shauket Malik Malik (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Conference and Exhibition, 11-14 November , Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 5.3.2 Multiphase Flow, 4.1.2 Separation and Treating, 3.2.6 Produced Water Management, 5.1 Reservoir Characterisation, 1.6 Drilling Operations, 2.2.2 Perforating, 3.3.1 Production Logging, 1.14 Casing and Cementing, 5.1.1 Exploration, Development, Structural Geology, 5.2 Reservoir Fluid Dynamics, 3 Production and Well Operations, 4.2.3 Materials and Corrosion, 2.3.3 Flow Control Equipment, 4.1.5 Processing Equipment, 4.2 Pipelines, Flowlines and Risers, 5.3.4 Integration of geomechanics in models
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Increases in water production can significantly reduce well performance and life of a well, and cause decreased oil production. Water influx can occur through several mechanisms and approach from several directions; accurate diagnostic information is important for the design of successful shutoffs and effective results. To mitigate this situation, water management is crucial. One option is to isolate the water producing zone with a rigless water shut-off technique, which is less costly than the use of workover rigs for interventions.
This paper presents case histories of five horizontal wells drilled in carbonate formations and producing excess water; three were completed in open hole and two were cased. A multiphase production logging (MPL) tool equipped with five miniaturized spinners for phase velocity measurement and six electrical and six optical probes for holdup data provided important diagnostic data for the decisions on remedial actions. Using the tool data, the operator pinpointed the water entries and performed shutoff operations based on the source of the entries and water flow profiles. Subsequent production test results showed that the water cut was reduced in all the wells. Examples from open and cased hole completions are shown utilizing a number of different shutoff techniques. In addition, oil production was considerably increased in many of the wells. These results demonstrate that accurate diagnostic information and an integrated approach are keys to successful rigless water shut-offs.
Most horizontal wells are drilled to improve oil production and to minimize water production. In addition, the drilling of horizontal sidetracks is increasing. The monitoring and management of these wells are challenging operations because their completions and interventions are complex, and it is difficult to obtain accurate diagnostics in the complex flow regimes occurring in their undulating deviations. Baldauff et al., (2004) and Al-Muthana et al., (2008) have shown that the use of an integrated compact production logging tool with multiple minispinners can provide accurate information on water entries and flow profiles.
For many reasons, water production can increase earlier than expected and deteriorate well performance. In some cases, horizontal wells can die suddenly (Nawawi et al., 2011). Water shut-off and remedial work is crucial to revive them and to reduce water cut to improve well performance. Successful shutoffs require an understanding of the water entry mechanism, the reservoir heterogeneities, and the wellbore operations. Accurate diagnostics and successful remedial executions can lead to significant improvements in well performance. An example of this process with the significant reduction of gas entry is given by Al-Behair et al., (2007). Because of unique wellbore and reservoir parameters and heterogeneities, each case requires a customized workflow. The feasibility of an intervention depends on conditions and the environment in each case. For illustration, this paper presents several field examples, including open hole and cased hole completions, with well history and performance before and after the remedial work.
|File Size||1 MB||Number of Pages||11|