Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid...

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James Whitford BHUC November 2019 Borehole Inspection: Methods, When and Why?

Transcript of Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid...

Page 1: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

James Whitford

BHUC November 2019

Borehole Inspection: Methods, When and Why?

Page 2: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Scratching the surface

Page 3: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Looking Deeper…

Page 4: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Why Inspect?Physical Condition

Casings

Page 5: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Physical Condition

2013 2014 2016

Screens

Why Inspect?

Page 6: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Why Inspect?

Physical Condition

Borehole stability

Page 7: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Why Inspect?

Physical Condition

Pump location and position

Page 8: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Why Inspect?

Hydrogeology

• Water movement – in/out flows

• Velocities and volumes

• Changes in water quality/chemistry

Page 9: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Why Inspect?

Formation Evaluation

• Identification lithology

• Porosity and porewater chemistry

• Fractures

Page 10: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Why Inspect?

New Boreholes

Page 11: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Techniques

CCTV

Page 12: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Techniques

Cement Bond Logging (CBL)

Page 13: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Techniques

Depth (m)

10

20

30

Density increases

Channelling of cement grout behind steel casingDensity Gamma Log

Density

Page 14: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Techniques

Acoustic Imager

Page 15: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Techniques

Fluid Logs• Temperature and Conductivity• Impellor Flowmeter• Heat Pulse Flowmeter• Nitrate

Page 16: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

TechniquesFluid Logs

Page 17: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

Techniques

Formation Logs• Natural Gamma• Resistivity and Induction• Caliper• Gamma Density• Neutron Porosity• Optical and Acoustic Imagers

Page 18: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

TechniquesFormation Logs

Page 19: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

When to inspect

• During the drilling programme• New boreholes• Regular inspection programme• When pumps are removed• Increases in turbidity• Variations in water quality• Contamination

Page 20: Borehole Inspection: Methods, When and Why? · Borehole Inspection: Methods, ... Techniques Fluid Logs • Temperature and Conductivity • Impellor Flowmeter • Heat Pulse Flowmeter

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