Bai giang pttkk well control and monitoring

01/2018 1

Đinh Công Vĩnh Luân – MSc in Offshore Engineering

Email: [email protected]

Well Control and Monitoring System

1. Well Control System

2. Well Monitoring System

References

1. (CDF) Jorge H.B. Sampaio Jr. “Drilling Engineering

Fundamentals.” Master of Petroleum Engineering. Curtin

University of Technology, 2007. Chapter 2

2. (WEC) Rabia, Hussain. “Well Engineering & Construction”. Entrac

Consulting Limited, 2002. Chapter 16

01/2018 2

Đinh Công Vĩnh Luân – MSc in Offshore Engineering

Email: [email protected]

Well Control System

01/2018 3

Đinh Công Vĩnh Luân – MSc in Offshore Engineering

Email: [email protected]

Well Control & Kick

✓ The functions of the well control system are

➢to detect, stop, and remove any undesired

entrance of formation fluids into the borehole.

✓ An undesired entrance of formation fluid into

the borehole is called kick and

➢may occur due to several reasons such as

❖ high pressure formations

❖ insufficient drilling fluid density

❖ drillstring swab

❖ loss of circulation

❖ formation fracture

01/2018 4

Đinh Công Vĩnh Luân – MSc in Offshore Engineering

Email: [email protected]

Kicks

✓ Any influx of formation fluids

(oil, gas or water) in the

borehole is known as a kick.

✓ When a kick is taken,

primary control has been

lost.

✓ An uncontrolled kick at the

surface is called a blowout.

01/2018 5

Đinh Công Vĩnh Luân – MSc in Offshore Engineering

Email: [email protected]

Causes of Kicks

✓ Kicks occur when “underbalance is found”.

✓ Underbalance is caused by:

➢Increase in Formation Pressure.

➢Mud Hydrostatic Reduction.

✓ What causes Mud Hydrostatic to drop?

Pressure = Mud Wt x Constant x TVD

01/2018 6

Đinh Công Vĩnh Luân – MSc in Offshore Engineering

Email: [email protected]

Primary, Secondary and Tertiary

Well Control

✓ Primary Control

➢Mud Weight.

✓ Secondary Control

➢Blowout Preventer (BOP)

✓ Tertiary Control

➢Control & Recovery

01/2018 7

Đinh Công Vĩnh Luân – MSc in Offshore Engineering

Email: [email protected]

Primary, Secondary and Tertiary

Well Control

✓ The well control system is designed to:

➢Detect a kick.

➢Close-in the well at surface

➢Remove the formation fluid which has flowed

into the well

➢Make the well safe

01/2018 8

Đinh Công Vĩnh Luân – MSc in Offshore Engineering

Email: [email protected]

Primary Well Control

✓ Mud Hydrostatic Pressure:

➢Mud Hydrostatic Pressure > Formation Pressure