Exploiting the Synergies by Combining Multilateral Well Intervention Techniques with Real Time Downhole Measurements Lessons Learned from Trilateral Horizontal Well Stimulation in the Partitioned Zone
- Jamal Al-Rubaiyea (Kuwait Gulf Oil Company) | Adel Attiea (Kuwait Gulf Oil Company) | Fahad S. Al-Hadyani (Schlumberger) | Ikhsan Nugraha (Schlumberger) | Pimteera Boonjai (Schlumberger) | Zafer Erkol (Schlumberger)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 15-17 November, Bangkok, Thailand
- Publication Date
- Document Type
- Conference Paper
- 2011. Copyright is retained by the author(s).
- 1.10 Drilling Equipment, 5.6.11 Reservoir monitoring with permanent sensors, 3.2.4 Acidising, 4.1.2 Separation and Treating, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 3 Production and Well Operations
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This reference is for an abstract only. A full paper was not submitted for this conference.
Multilateral wells pose a unique challenge to operators when planning for any intervention. Correctly accessing and uniformly acidizing all laterals continues to be challenging. While lack of reliable downhole data and knowledge about naturally fractured zones or poor correlation between porosity and permeability in carbonates limit the effectiveness of a stimulation treatment; sometimes the inability to access all laterals even prevents the lateral from being acidized at all. These limitations in acidizing, therefore, provide lower than expected gains.
Selective lateral access by using coiled tubing multilateral entry tools (CTMET) have provided a first step to selectively place fluids in each lateral. However, even selective lateral access cannot provide positive confirmation that treatment fluids are confined to the intended lateral. New downhole measurements with fiber optic assisted coiled tubing (FOACT) seek to mitigate some of the uncertainty that prevails in such well interventions.
This paper describes an innovative approach adopted for the stimulation of a tri-lateral open-hole carbonate oil producer in Kuwait. The distributed temperature survey (DTS) and real time downhole data obtained from FOACT was used in conjunction with the CTMET to map and access all laterals. The DTS profiles were used to track real-time temperature changes between fluid stages of a stimulation treatment. Identifying and prioritizing which lateral to stimulate first, lateral injection distribution, formation fluid invasion, diverter efficiency and changes to the injectivity profile were interpreted in real time to improve the fluid placement.
The paper describes the effect of combining MLRT (multi lateral reentry techniques) with the fiber optics technology simultaneously and the lessons learned from this innovation. This synergistic approach not only improved operational efficiency, well-site safety but also resulted in reviving production from a previously dead well in a cost effective manner for the operator. As a result, the entire approach towards multi-lateral well stimulation in Kuwait was revolutionized with renewed confidence towards achieving better results in future interventions.
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