5 7 deepwater well control introduction

Introduction to Deepwater Well Control At the end of the lecture, you should be able to: 1.. Describe the key aspects of well control in deepwater operations... Deepwater well control•

Introduction to Deepwater

Well Control

At the end of the lecture, you should be able to:

1 Describe the key aspects of well control in

deepwater operations

Deepwater well control

• Define Deepwater Well control?

• When can it occur?

• Why,how, can it occur?

• What are the hazards, risks, probability and

consequence of well control incidents?

• What plans and processes will be used to

manage and control well control incidents?

• Are all aspects “fit for purpose” ?

Floating vessels

• Vessels movement

– Moored, dynamic positioned

– Operating environment

– Kick detection

• BOP’s located on seabed

– Response time

– Redundancy required

Deepwater drilling

equipment

• Surface equipment

• Marine riser &

tensioners

• BOP’s

• Subsurface

– Subsea

– Downhole

• Drilling

• Measurement

• Monitoring

Deepwater operations

• Water depth

– Operating limits and margins

• Well design

• Hang off operations

• Mud & cement

• Hydrates

• Routine operations

– Drilling, tripping casing.

• Non routine operations

– Well intervention

Pressure

Deepwater special considerations

• Preparing to kill a well

• Well control with bit off bottom

• Well control with bit on bottom

• Volumetric stripping operations

• Kill with no pipe in hole

• Circulating gas from riser and BOP’s

• Bullheading operations

• Shearing pipe

• Shallow well control

• Lost circulation

Pore, fracture and mud

pressures

• Hydrostatic pressures

• Circulating pressures

• Formation pressures

• Bottom hole pressures

• Fracture pressures

• Influx and formation

characteristics

Well control practices

– Pump rate, PVT effects, fluid regimes

methods?

Kick warning signs

Kick indicators

• Lost circulation

– Mud weight (& effects) > formation pressure

– Extent of Shut in pressures

– Surge pressures

• Well flows

– Increase of flow (drilling, circulating, tripping)

– Pit gain

– Drilling break, swab effect, < pump press

– Flow from well with pumps off (surge effect)

Well control equipment

Kill procedures

• Drillers method

• Weight and weight method

• Bullheading

• Volumetric

• Dynamic kill

– Shallow gas, water flows

• Contingency

– Blow out and relief well drilling

Decision trees

• Shallow water flow

• Shallow gas

• Shallow well control

• Wellbore stability and ballooning

• Lost circulation

• Exceeding MAASP

• Hydrates

• Well kill

• Contingency plans

Deepwater Well Control summary

Now, you should be able to:

1 Describe the key aspects of well control in

deepwater operations

Introduction to Deepwater

Well Control