part 3 - drilplex (nidc dec 05)

7/22/2019 Part 3 - Drilplex (Nidc Dec 05)

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DRILPLEXreducing overall drilling costs

FEATURES Simple water based fluid design.

Unique shear thinning rheology Excellent HSE profile Temperature Stable Cost effective and highly versatile

BENEFITS Low environmental impact

- easily reused, recycled and retreated Reduced wellbore erosion in poorlyconsolidated surface formations.

Reduced whole mud losses- porous sandstones- fractured carbonates.

Exceptional hole cleaning and cuttings

suspension capability Improved downhole fluid hydraulics Reduced non productive time and

increased penetration rates. Non reservoir damaging

Remote locationdrilling

High Angle Drilling Horizontal Drilling Reservoir Drilling Geothermal Drilling

Coiled Tubing Drilling Deepwater Drilling Casing Milling


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What is Mixed Metal Oxide (MMO)

It is a synthesized mixture of inorganic

Magnesium and Aluminium oxides. It is a white powder and insoluble in

water. It is non toxic and contains no heavy

metals. The MMO crystal lattice is charge

deficient giving the high cationiccharge.

The MMO crystal is 10 times smallerthan a bentonite platelet.- Face dimension ~0.05micron- Edge dimension ~0.0008 micron)

The MMO crystal has 6-7 times thecharge density of a bentonite platelet.

+

+ +

++

+

1 micron


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The DRILPLEXBentonite complex

+

+

+

+

-

- -

-

-+ -+ + -+ +

-

-

--

- - -

-

-

--

GELPLEX Bentonite platelet withnegative faces. Edge charges are

pH-dependent.

+

+ +

++

+

1 micron

DRILPLEX:

positively charged.

+

+

+

+

-

- -

-

-+ -+ + -+ +

+ + +

+ + +

+ +The DRILPLEX GELPLEX complex

fully formed.


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DRILPLEX System components

GELPLEX- An untreated sodium bentonite specifically selected for the

DRILPLEX system.- 8 to 12 lb/bbl (23 to 35 kg/m3) prehydrated.

DRILPLEX- The Mixed Metal Oxide product- 0.8 to 1.2lb/bbl (2.3 to 3.5 kg/m3)

FLOPLEX- Fluid Loss control additive specific to the DRILPLEX system.- 0 to 4 lb/bbl (0 to 11.4kg/m3) depending on application.

WATER- Freshwater for land; Seawater and Drillwater for offshore.

SODA ASH- Hardness control

CAUSTIC- pH control

DENSITY- Barite as required. Maximum recommended mud weight is 14ppg /

1.7sg.


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DRILPLEX Shear Thinning Properties


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Typical Formulation and Properties

FORMULATION

- Gelplex 8 lb/bbl 2.85 kg/m3

- Fresh water 0.73 bbl 0.73 m3- DRILPLEX 0.8 lb/bbl 2.28 kg/m3

FLOPLEX 4.0 lb/bbl 11.4 kg/m3- BARITE 27.9 lb/bbl 79.5 kg/m3

PROPERTIES (120degF)- Density 9.0 ppg (1.08 kg/m3)

Initial After ageing (250degF)- PV 26 21- YP 42 31- Fann 6 reading 24 24- Fann 3 reading 23 23- 10 sec Gels 26 25- 10 min Gels 50 37

Low PV/YP ratio

Highly shear thinning

fluid

High Flat Gels

High 6 & 3 rpm readings

Low shear Rate Rheology

all near the same value

Minimal products

Easily formulated


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Key Properties to monitor and control.

Yield Point 6 rpm reading 3 rpm reading and 10 sec gel strengthshouldall have similar values in low density, clean fluid in good condition.

LSRV range should be:

- ~22 to 28 for normal drilling applications

- 60 to 90 for drilling lost circulation zones.

Gels should be high, flat and non-progressive

pH should be maintained between 10.5 and 11.0

Soluble Calcium and Magnesium should be maintained below 100mg/L.

MBT should be maintained below 20 lb/bbl [57 kg/m3]

Pf should be maintained >0.5 GELPLEX: DRILPLEX ratio maintained at ~10:1

PTS 200 added to extend fluid loss of FLOPLEX above 250degF.


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DRILPLEX Filter Cake

700mD

Sandstone

Well Ordered

Filter Cake

100 micron


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Summary

Features- Water Based Drilling Fluid

System with simple formulationand design

- Unique shear thinning rheology- Zero flow at wellbore face- Low reservoir damage and easy

clean up- High LC50 numbers

Benefits- Minimising losses to poroussandstones and fracturedcarbonate loss zones.

- Minimising wash outs in poorlyconsolidated formations

- Easy removal of cavings

- Stabilising surface formationssubject to collapse- Reduced drilling down time.- Hole Cleaning and Suspension

Capability

Applications- Drilling lost circulation zones in

fractured and porous

formations

- Drilling fragile and poorlyconsolidated and unstable

formations.

- Casing Milling- Horizontal drilling- Deep Water Drilling- Geothermal Drilling- Drilling performance in areas

with risk of non productive time

- Remote location drilling- Reservoir Drilling

part 3 - drilplex (nidc dec 05)

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