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MPD (Managed Pressure Drilling) Cheat Sheet (DRAFT) by

About the MPD Process.

This is a draft cheat sheet. It is a work in progress and is not finished yet.


Managed Pressure Drilling Operat­ion­s-S­urface Back-p­ressure with a Subsea Blowout Preventer
- Managed Pressure Drilling Operations - Pressu­rized Mud Cap Drilling with a Subsea Blowout Preventer

Drilling Methods

Conven­cional Drilling
Zone of Low Pressure is encoun­tered
Drilling mud is higher than the formation pressure and it's begins to enter existing fractures and vugs
Second Zone of Low Pressure is encoun­tered
Again, Mud Weight exceeds formation pressure and fluid losses begin
The loss of fluid reduces the hydros­tatic pressure and when it's lower than the formation pressure gas enter the wellbore and causes the kick
MPD Drilling
MPD is Adaptative drilling process used to precisely control the annular pressure profile throughout the wellbore
The intention of MPD is to avoid continuos influx
Any influx incidental to the operation will be safely contained

When and why to use MPD?

- Drill conven­tio­nally “Un-dr­ill­able” tight Pore/C­oll­aps­e/F­racture pressure gradients;
- Drill to target depth in wells with high in-situ stresses;
- Wells with rapid-­change in pore pressure regimes, abnormal pressure regimes;
- Increase ROP drilling closer to balanced condition; ROP stands for “Rate of Penetr­ation,” which is basically how fast the bit is drilling the hole
- Reduce number of loss/kick occurr­ences;
- Reduce time spent dealing with well control events;
- Detect and manage kicks/­losses earlier;
- Differ­entiate Kick from Balloo­ning;
- Reduce pressure cycles that cause fatigu­e-r­elated borehole instab­ility;
- Reduce open hole exposu­re-time induced borehole instab­ility;
- Reduce mud costs;
- Set casing deeper;
- Optimize number of casing strings;
- Trip safely;
- Remove H2S hazard from rig floor;
- Drill HPHT wells safely. The term HPHT is typically used to describe high-t­emp­era­ture, high-p­ressure wells that are at either a higher temper­ature or pressure than most other oil wells – usually over 150°C and 10,000psi at their deepest point

MPD Techniques

Constant Bottom Hole Pressure (CBHP)
Constant bottomhole pressure MPD reduces NPT (Non-P­rod­uctive Time) and enable drilling when pore- to fractu­re-­pre­ssure gradient windows are narrow
Pressu­rized Mud Cap Drilling (PMCD)
Pressu­rized Mud Cap Drilling MPD enables drilling in extrem­e-loss situations
Dual Gradient Drilling (DGD)
Dual Gradient Drilling MPD enable total well depth in the right hole size in deep-well and deepwater drilling
Return Flow Drilling (RFC)
Return Flow Drilling MPD reduces to risk to personnel and the enviro­nment from drilling fluids and well control incidents

How to Control the Annular Pressure?

Rotating Control Device (RCD)
Rotating control devices are the first line of defense against fluid loss during critical operat­ions. Use to isolate the wellbore
Chock Manifold
Apply the pressure
Coriolis Flow Meter
Flow measur­ement
MPD System Control
System control

Equipment Flow Diagram

Equipment Flow Diagram Explan­ation

The flow diagram shows MPD flow path in its simplest form.

Mud is pumped from the mud pits via the rig pump.

The rig pump delivers flow to the stanpipe then into the Top Drive and down the drill string

Return flow comes up via the annulus and exits via a take off point below the RCD known as the flow spool.

The RCD seals the wellbore whilst allowing the deployment and retrival of drill pipe into the well bore.

From the flow spool pipe work connect to the MPD Manifold fitted with the PLC controlled chokes or pressure control valves and the flow meters.

Flow exits the MPD manifold and returns to the rigs mud pits after removal of the drilled cuttings.

If used a MGS Mud gas separator sits directly after the MPD manifold and removes gas to a safe vent. Without a MGS gas is likely to break out at the rigs shakers or muds pits.

MPD Flow Path - Drilling

1 - Rig Bombs start the mud drilling circul­ation;
2 - The flow goes down through the drillpipe;
3 - The flow return take it from RCD and instead of sending it to direct choke, like in conven­cional drilling, we send to MPD Manifold;
4 - MPD Manifold;
5 - Coreolis Flow Meters.

MPD Flow Path - Connec­tions

MPD Flow Path - Circul­ating Influx

MPD Flow Path - Conven­tional Well Control