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

Curtin University is a trademark of Curtin University of Technology CRICOS Provider Code 00301J

Mochammad Rizal Abda

Application of Resilient Graphite to Mitigate Lost Circulation

May 2018

INTRODUCTION

• Encountered when drilling into cavernous,

vugular, high permeability, naturally fractured formations, and Drilling Tensile Induced Fracture (DTIF) (Alsaba, 2014)

• 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)

(Publications.iodp.org) (Howat,2016)

Based on Loss Rate (bbls/hr) Seepage (1-10 bbls/hr) Partial (10-500 bbls/hr) Severe (> 500 bbls/hr)

• Loss of Millions of dollar due to lost of fluid to

formation

• Selection of LCM (Lost Circulation Material)

based on the severity of the loss circulation (Savari,2016)

• Importance of evaluating the LCM prior to the

field application (Alsaba, 2014)

• No benchmarking of Graphite performance in

wide range of fracture size

(Nayberg and Petty. 1986)

INTRODUCTION

Based on Procedure Prevention Remediation

METHOD

• Sample made from Cement
• Certain width of fracture
• 30 cm length
• Pressure measurement
• Water calibrated
• Flow rate and permeability

change

• Assuming roughness effect

is neglected

OUTLINE

• Sample

preparation

• Sample

measurement

Procedure

• 2 times test
• calibration

Water Phase

• atmospheric
• 20 Psi
• 30 Psi
• calibration

Graphite Phase

Sample Preparation

• 0.07% Xanthan

Gum (Xcd) in 1300 ml water

• Stir with 1000

rpm

• Slowly input the

Xcd to the water

• % of Graphite to

the mixed Xcd- water

• The Xcd would

hold the Graphite from settling down

• Thermally stable
• High

compressive strength

• Less than 0.05

ppm heavy metal

• Compatible to

any drilling fluid

MFP (modified Filter Press

100 psi Wika Base Cap:

• Fluid Flow

Water tube :

• Bubble effect
• Pressure Sensor
• Daq and Sensor set
• Sets of Permeablity and Rate data

Data

Stable Section (Flow Rate) Stable Section (Permeability)

Flow rate of 5% Graphite 0.8 mm frac width

10 20 30 40 50 60 2 4 6 8 10 12 14

rate (cc/s) Time

Water 1 Water 2 G_atm G_20 psi G_30 psi

Permeability of 5% Graphite 0.8 mm frac width

500 1000 1500 2000 2500 3000 3500 4000 4500 5000 2 4 6 8 10 12 14

Perm (darcy) Time

Water 1 Water 2 G_atm G_20 psi G_ 30 psi

• 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

FURTHER WORK

(Kumar,2011)

[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

REFERENCES