WELL CONTROL COURSE SECTION A

SECTION A

KEY DEFINITIONS

Drilling Ahead

WHAT IS A KICK?

IT IS AN INFLUX OF FORMATION FLUID

THAT CAUSES THE WELL TO FLOW.

 

WHAT IS A BLOWOUT?

AN UNCONTROLLED EXIT OF THE FORMATION FLUIDS

AT THE SURFACE

 Hydrostatic Pressure

Hydro- means a fluid

Static- means at rest

Hydrostatic in the wellbore is from the mud

MUD HYDROSTATIC

         VERTECAL  WELL      

STANDERED FORMULA  WITH  FT., PPG AND PSI

MUD HYDROSTATIC  HP  = 0.052 X MUD WEIGHT X DEPTH

MUD GRADIANT   =  0.052  X MUD WEIGHT           PSI\FT.

Pressure (psi) = Mud Weight x .052 x TVD

Pressure Gradient (psi/ft) = Mud Weight, ppg x .052

Pressure Gradient (psi/ft) =Pressure, psi ¸ TVD, ft

Mud Weight, ppg = Pressure Gradient ¸ .052

Mud Weight (ppg) = Pressure ¸ TVD ¸ .052

TVD (ft) = Pressure (psi) ¸ Mud Weight (ppg) ¸ 0.052

FORMATION FLUID 

Fluid present in the pore space of the rock.

FORMATION PRESSURE

 

The pressure of the formation fluids.

  What is formation fluid pressure?

Formation Pressure: is the fluid pressure in the pore spaces of the formation.

BOTTOM HOLE PRESSURE 

IT  IS THE TOTAL  PRESSURES  EXERTED AT THE  BOTTOM  OF  THE WELL.

Balance

 

Mud Hydrostatic =Formation Pressure

Overbalance

 

Mud Hydrostatic >  Formation Pressure

Underbalance

  

Mud Hydrostatic <  Formation Pressure

 

WHAT IS WELL CONTROL?

1-PREVENTING A KICK

PRIMARY

2-SHUTTING IN THE WELL AFTER A KICK HAS BEEN TAKEN

SECONDARY

  

Primary control

Secondary Control

Blowout Preventers

 

WELL CONTROL CYCLE

HOW CAN KICKS HAPPEN?

Mud Hydrostatic and Formation Pressure

Always Remember that HP and FP are two opposite forces.