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TitleSonatrach's Stimulation
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Total Pages109
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Page 54

Development Phase

September – October 2005©abalt solutions limited - 2005

INTRODUCTION TO HYDROCARBON EXPLOITATION

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©2005 Abalt Solutions Limited. All rights reserved

Job execution

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MLD (Minilateral Lateral Drilling). The drilling of laterals
tunnels around the wellbore, through the casing and cement into
the formation, creating a draining architecture (fish bone
structure) that will have a direct impact over the flow
performance in the well, depending on the number of tunnels
created.

Formation Penetration (MLD tool): Up to 2 mt (6.6 ft), tunnels.

Description (MLD Tool): Downhole tool system designed to
produce communication tunnels, radially from an existing
wellbore into reservoir rock, for up to 2 meters in length. The tool
drills one tunnel at a time, each requiring 10 to 20 minutes to
complete, and is capable of making multiple tunnels during a
single run.

Alternative technology – wellbore communication

Page 55

Development Phase

September – October 2005©abalt solutions limited - 2005

INTRODUCTION TO HYDROCARBON EXPLOITATION

Abalt Solutions

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©2005 Abalt Solutions Limited. All rights reserved

Tool sizes: The MLD tool is available for casing sizes of 4 1/2", 5",
5 1/2", 6 5/8", 7" , 8 5/8", 9 5/8".

Drilling Tunnels: The creation of the tunnels will be governed by
factors such as well depth and rock Lithology. The completion fluid
will also affect the number of tunnels that can be completed on a
single trip – normally the tool will be capable of 4 to 8 tunnels per
run.

Work over fluids: A selection of the work over fluid should be made
based on its compatibility with the formation fluids and mineralogy
to reduce the risk of formation damage during the operation. Fluids
such as light oil would often be a good choice.

Alternative technology – wellbore communication

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Introduction to Hydrocarbon Exploitation

©2005 Abalt Solutions Limited. All rights reserved

Pratap Thimaiah

Acidizing Applications

Page 108

Development Phase

September – October 2005©abalt solutions limited - 2005

INTRODUCTION TO HYDROCARBON EXPLOITATION

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Clay Control

 Clays: below 4m
– illite, smectite, chlorite, zeolite, kaolinite

 Silts: 4 – 64 m
– feldspar, mica, chert

 Sands: over 64 m

 clays cause 2 major problems:
– 1. Swelling
– 2. Migration

KCl is temporary clay control agent
L55 is a permanent clay stabilizer that work by

adsorbing on the clay surface

fines

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Friction Reducers
 Used during matrix acidizing through CT
 Suppress turbulence of the fluid

Action of friction reducers
(at a given flow rate)

•Natural polymers like guar gum, gum karaya and cellulose derivat ives, as
well as synthetic polyacrylamides, have long been used as friction reducers.

•Each of these polymers can have different properties, depending on
molecular weight, chemical composition, cross linking, branching, etc.

•Some polyacrylamides (i.e., Friction-Reducing Agent J120) are excellent
friction reducers for acid and can greatly reduce the friction pressure drop in
tubulars

Page 109

Development Phase

September – October 2005©abalt solutions limited - 2005

INTRODUCTION TO HYDROCARBON EXPLOITATION

Abalt Solutions

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©2005 Abalt Solutions Limited. All rights reserved

Thank You

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