JAMSTEC / CDEX Cuttings Drilling mud circulates between the vessel and downhole during riser drilling. Once the drilling mud returns to Chikyu , the solids are removed, and the liquid is recycled and reused. This is called the “mud circulation system”. The cuttings and other solids are collected, and not dumped, to protect the environment. Riser drilling mud is a special composition of various materials and chemicals. Mud Circulation System Mud circulation route Riser pipe Casing pipe Drill bit BOP (Blow Out Preventer) Cement Mud circulation system Drilling Mud Drilling Mud Drilling Mud Drilling Mud Centrifuge system Drill pipe Mud tank Mud pump Cuttings are separated by the shale shaker, and they are as important as core samples. They are processed and analyzed in the laboratory. Riser drilling system Riser drilling system Mud pump (on vessel) Annulus (space) between drill pipes and riser pipes. Through drill pipes. Jetting from drill bit. Mixture with cuttings. Solid-liquid separation (on vessel) Mud tank Pump circulating drilling mud. Sieve with conveyor Centrifuge system Shale shaker (sieve with vibration) ・Removes cuttings from borehole. ・Cools and washes the drill bit and downhole equip- ment (jetting speed is 100-120 m/s). ・Prevents borehole collapse by coating the borehole wall with drilling mud. ・Transfers borehole information (geology, gas, etc.) to the ship. ・Suspends cuttings in the drilling mud when mud circulation stops. Drilling mud usage Photos: Continuous formation changes are observed in cuttings, after sorting with sieves and examined by microscope. Separating cuttings with the shale shaker. 5 mesh 16 mesh 60 mesh Separate mud from cuttings in a three step process: Recycle mud after special processing. > 4 mm 1-4 mm 0.25-1 mm Then sample for laboratory analysis. ❶ ❶ ❷ ❻ ❷ ❸ ❹ ❺ ❸ ❹ ❺ ❻ Cuttings The Mud Circulation System and Cuttings The Mud Circulation System and Cuttings How riser drilling works, and import samples How riser drilling works, and import samples How riser drilling works, and import samples How riser drilling works, and import samples

The Mud Circulation System and Cuttings...The Mud Circulation System and CuttingsThe Mud Circulation System and Cuttings How riser drilling works, and import samplesHow riser drilling

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JAMSTEC / CDEX

Cuttings

Drilling mud circulates between the vessel and downhole during riser drilling. Once the drilling mud returns to Chikyu, the solids are removed, and the liquid is recycled and reused.

This is called the “mud circulation system”. The cuttings and other solids are collected, and not dumped, to protect the environment. Riser drilling mud is a special composition of various materials and chemicals.

Mud Circulation System

Mud circulation route

Riser pipe

Casing pipe

Drill bit

BOP(Blow Out Preventer)

Cement

Mud circulationsystem

DrillingMudDrillingMud

Centrifugesystem

Drill pipe

Mud tank

Mud pump

Cuttings are separated by the shale shaker, and they are as important as core samples. They are processed and analyzed in the laboratory.

Riser drilling systemRiser drilling system

Mud pump (on vessel)

Annulus (space) betweendrill pipes and riser pipes.

Through drill pipes.

Jetting from drill bit.Mixture with cuttings.

Solid-liquid separation (on vessel)

Mud tankPump circulating drilling mud.

Sieve with conveyor

Centrifuge system

Shale shaker(sieve with vibration)

・Removes cuttings from borehole.・Cools and washes the drill bit and downhole equip-

ment (jetting speed is 100-120 m/s).・Prevents borehole collapse by coating the borehole

wall with drilling mud.・Transfers borehole information (geology, gas, etc.)

to the ship. ・Suspends cuttings in the drilling mud when mud cir-

culation stops.

Drilling mud usage

Photos: Continuous formation changes are observed in cuttings, after sorting with sieves and examined by microscope.

Separating cuttingswith the shale shaker.

5 mesh

16 mesh

60 mesh

Separate mud from cuttings in a three step process:

Recycle mud after special processing.

> 4 mm

1-4 mm

0.25-1 mm

Then sample forlaboratory analysis.

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❸

❹

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❹

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Cuttings

The Mud Circulation System and CuttingsThe Mud Circulation System and CuttingsHow riser drilling works, and import samplesHow riser drilling works, and import samplesHow riser drilling works, and import samplesHow riser drilling works, and import samples