Application of Resilient Graphite to Mitigate Lost Circulation - PowerPoint PPT Presentation

Application of Resilient Graphite to Mitigate Lost Circulation Mochammad Rizal Abda May 2018 Curtin University is a trademark of Curtin University of Technology CRICOS Provider Code 00301J

INTRODUCTION - Encountered when drilling into cavernous, vugular, high permeability, naturally fractured formations, and Drilling Tensile Induced Fracture (DTIF) (Alsaba, 2014) (Publications.iodp.org) - Lost circulation in formation with Vugs and natural fractures increase drilling NPT (non- productive time) and Cost (Kumar,2011) - Naturally fractured reservoir is unknown on width (Droger,2014) (Howat,2016)

Seepage (1-10 bbls/hr) INTRODUCTION Based on Loss Rate Partial (10-500 bbls/hr) (bbls/hr) - Loss of Millions of dollar due to lost of fluid to formation Severe (> 500 bbls/hr) - Selection of LCM (Lost Circulation Material) based on the severity of the loss circulation (Savari,2016) (Nayberg and Petty. 1986) - Importance of evaluating the LCM prior to the field application (Alsaba, 2014) Prevention - No benchmarking of Graphite performance in Based on wide range of fracture size Procedure Remediation

METHOD - Pressure measurement - Sample made from Cement - Flow rate and permeability - Water calibrated - Certain width of fracture change - 30 cm length - Assuming roughness effect is neglected

OUTLINE • atmospheric • Sample preparation Water • 2 times test Graphite • 20 Psi Procedure Phase Phase • Sample • calibration • 30 Psi measurement • calibration

Sample Preparation - Thermally stable - 0.07% Xanthan - The Xcd would - % of Graphite to - High Gum (Xcd) in hold the Graphite the mixed Xcd- compressive from settling down 1300 ml water water strength - Stir with 1000 - Less than 0.05 rpm ppm heavy - Slowly input the metal Xcd to the water - Compatible to any drilling fluid

MFP (modified Filter Press 100 psi Wika Water tube : - Bubble effect - Pressure Sensor - Daq and Sensor set - Sets of Permeablity and Rate data Base Cap: - Fluid Flow

Data Stable Section (Permeability) Stable Section (Flow Rate)

Flow rate of 5% Graphite 0.8 mm frac width 60 50 40 rate (cc/s) Water 1 Water 2 30 G_atm G_20 psi 20 G_30 psi 10 0 0 2 4 6 8 10 12 14 Time

Permeability of 5% Graphite 0.8 mm frac width 5000 4500 4000 3500 Perm (darcy) 3000 Water 1 Water 2 2500 G_atm 2000 G_20 psi 1500 G_ 30 psi 1000 500 0 0 2 4 6 8 10 12 14 Time

FURTHER WORK - Modification of sample into engineered metal plate to cover wide range of pressure - Providing better seal in the base cap - Possible visual examination of Graphite leftover in the fracture-like channel using metal model - Possibility to introduce roughness for inside wall of fracture (Kumar,2011)

REFERENCES [1] Alsaba,M. et al.2014. Lost Circulations Material Capability of Sealing Wide Fractures. SPE- 170285-MS. [2] Savari,S. et al.2016. Lost Circulation Management in Naturally Fractured Reservoir. SPE/IADC-178165-MS [3] Morita,N.1990. Theory of Lost Circulation Pressure. SPE 20409 [4] Droger,N. et al.2014. Degradable Fibre Pill for Lost Circulations in Fractured Reservoir Section. IADC/SPE 168024 [5] Savari,S. 2011. Improved Lost Circulation Treatment Design and Testing Technique Minimizes Formation Damage. SPE 143603 [6] Wang,H. et al. 2005. The Key to Succesfully Applying Today’s Lost -Circulations Solution. SPE 95895 [7] Howat,E. et al. 2016. Identification of Vuggy Zones in Carbonates Reservoirs from Wireline Logs Using Machine Learning Technique. Search and Discovery Article # 51237