Mustafa Al Mubarak
Geology Domain Champion
SLB
Mustafa Al Mubarak is Geology Domain Champion with 11 years of experience with SLB in oil & gas industry. He has BSc with Specialization in Geology-Physics, University of Ottawa, Canada. His current role as Geology Domain Champion focuses on borehole image analysis and side wall core operation planning.
Participates in
TECHNICAL PROGRAMME | Primary Energy Supply
Advances in Geoscience
Forum 05 | Digital Poster Plaza 1
30
April
10:00
12:00
UTC+3
Objectives/Scope:
Carbonate rocks reservoirs characterized by complex natural fractures system combined with large dissolution karstic features. Moreover, they have extensive and extremely complex secondary porosity system. Acquiring good, reliable, and interpretable image logs that clearly resolve the rock texture is always challenging particularly while encountering partial and complete fluid loses while drilling.
Methods, Procedures, Process:
The conventional way of acquiring image logs when losses are encountered in the well is through conveying the tool down the hole through the drill pipe which is called TLC (tough logging conditions) which is time consuming. It has been observed that the image quality received with using the forementioned process is not up to the expectations. Although the LWD would give quite good results, the need of 6-arm mechanical calipers is important for completion decisions. Therefore, the need for a new way of conveying Wireline tool was crucially needed which is eventually achieved by introducing the new slim hole imaging through bit technology.
Results, Observations, Conclusions:
Both thru the bit imaging technology and high resolution LWD imager allowed to confidently perform fracture analysis. Both technologies allow the quantification of the fracture attributes, which is a key step in the field development of the naturally fractured reservoirs. The fractures attributes quantification includes orientation, density, porosity, and hydraulic fracture aperture. However, the high-resolution micro-resistivity through bit imaging technology allowed to acquire a higher resolution image that can clearly resolve the rock texture particularly, hence providing a more confident image interpretation that will eventually impact the completion design optimization very positively. Moreover, the presence of heterogeneity in carbonates, pose a challenge for the characterization of such rocks. The identification of textural variations advanced techniques in borehole image analysis have been applied. Post-processing advanced porosity spectrum analysis methods delivers new insight into previously established interpretations of the reservoir.
The new imaging technology helped to reduce the time of the static conditions of the wells and hence reduced the possibility of losing more muds to the formation across the fractured and karstified zones before acquiring the image log, which enabled acquiring a high-quality image across the full hole circumference unlike the image acquired on TLC operation.
Novelty/Significance/Additive Information:
In this paper; The results of all imaging technologies will be discussed in details through couple of case studies. It was concluded that both Thru the bit and LWD provide good image in fractured carbonate. However, thru the bit operation improves the efficiency, save rig time, enhanced the completion design and reservoir characterization through the good image quality acquired.
Carbonate rocks reservoirs characterized by complex natural fractures system combined with large dissolution karstic features. Moreover, they have extensive and extremely complex secondary porosity system. Acquiring good, reliable, and interpretable image logs that clearly resolve the rock texture is always challenging particularly while encountering partial and complete fluid loses while drilling.
Methods, Procedures, Process:
The conventional way of acquiring image logs when losses are encountered in the well is through conveying the tool down the hole through the drill pipe which is called TLC (tough logging conditions) which is time consuming. It has been observed that the image quality received with using the forementioned process is not up to the expectations. Although the LWD would give quite good results, the need of 6-arm mechanical calipers is important for completion decisions. Therefore, the need for a new way of conveying Wireline tool was crucially needed which is eventually achieved by introducing the new slim hole imaging through bit technology.
Results, Observations, Conclusions:
Both thru the bit imaging technology and high resolution LWD imager allowed to confidently perform fracture analysis. Both technologies allow the quantification of the fracture attributes, which is a key step in the field development of the naturally fractured reservoirs. The fractures attributes quantification includes orientation, density, porosity, and hydraulic fracture aperture. However, the high-resolution micro-resistivity through bit imaging technology allowed to acquire a higher resolution image that can clearly resolve the rock texture particularly, hence providing a more confident image interpretation that will eventually impact the completion design optimization very positively. Moreover, the presence of heterogeneity in carbonates, pose a challenge for the characterization of such rocks. The identification of textural variations advanced techniques in borehole image analysis have been applied. Post-processing advanced porosity spectrum analysis methods delivers new insight into previously established interpretations of the reservoir.
The new imaging technology helped to reduce the time of the static conditions of the wells and hence reduced the possibility of losing more muds to the formation across the fractured and karstified zones before acquiring the image log, which enabled acquiring a high-quality image across the full hole circumference unlike the image acquired on TLC operation.
Novelty/Significance/Additive Information:
In this paper; The results of all imaging technologies will be discussed in details through couple of case studies. It was concluded that both Thru the bit and LWD provide good image in fractured carbonate. However, thru the bit operation improves the efficiency, save rig time, enhanced the completion design and reservoir characterization through the good image quality acquired.
