In-well monitoring for Deepwater Wells - Operator's View
- Sandeep Patni (Shell) | Dennis Dria (Myden Energy Consulting)
- Document ID
- Offshore Technology Conference
- Offshore Technology Conference, 05-08 May, Houston, Texas
- Publication Date
- Document Type
- Conference Paper
- 2014. Offshore Technology Conference
- 2 Well completion, 7 Management and Information, 7.2.1 Risk, Uncertainty and Risk Assessment, 6.3 Safety, 2.4.3 Sand/Solids Control, 2.2 Completion Installation and Operations, 7.2 Risk Management and Decision-Making, 3.3 Well & Reservoir Surveillance and Monitoring, 2.3 Completion Monitoring Systems/Intelligent Wells
- Real Time, Surveillance, Sensing, Downhole
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The high cost of subsea intervention makes in-well monitoring its greatest value. Even if interventions are possible it may not be at optimal well condition with the traditional technology. There also will be SIMOPS and operation issues. Real time in-well monitoring can be done at full well rates to operate well at maximum safe rates and thus lead to higher recovery. Acquiring key reservoir productivity and continuity data early can decrease risk for subsequent well decisions and help in development decisions. In-well monitoring will provide flow rates by sand layer, provide gas breakthrough and water breakthrough information and pinpoint exact location. All this information to engineers can help in decreasing production deferment from these producing wells. In case of injectors, warm back data helps in identifying zones where maximum water is getting injected and may identify out of zone injection.
However significant challenges remain in selection, qualification and deployment of these technologies in deepwater subsea wells. The paper will provide an operator's view point covering some of the key challenges below:
All components must be rigorously qualified to meet the stringent safety and operational requirements. The subsea tree interface between the tree and tubing hanger and between the lower upper completion creates a significant technical challenge. While there are potential solutions, dispersed capability in supplier base creates an integration challenge.
The scope is further challenged by implementing across diverse reservoirs, flow and production characterization, completion type and enormous integration across various product groups.
There is no point deploying state of the art advanced sensing if the resulting data is not easily accessible and interpreted. Especially in the subsea environment where costs are high, the entire value chain (hardware, data management and interpretation) needs to be in place to bring value.
Resolution, accuracy and sampling time are interrelated and we are not able to achieve all with the current technology at the desired depth and offset distances. For certain operation such as planned well shut-in, buildups and press temperature analysis we need higher sampling rate which are easily and remotely configurable
Operator needs to overcome internal hurdles – various functional teams (wells, subsea, IT) have to work together; this requires significant effort in terms of working the interfaces, integration and ultimately moving towards standardization.
In-well monitoring can improve quality of surveillance in subsea wells enabling low cost, non intrusive, well and reservoir surveillance provided the industry overcomes the technical challenges/gaps and improves the reliability of the system.
|File Size||1 MB||Number of Pages||7|
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