Petroleum and natural gas industries - Equipment for well cementing - Part 2: Centralizer placement and stop-collar testing (ISO 10427-2:2004)

ISO 10427-2:2004 provides calculations for determining centralizer spacing, based on centralizer performance and desired standoff, in deviated and dogleg holes in wells for the petroleum and natural gas industries. It also provides a procedure for testing stop collars and reporting test results.

Erdöl- und Erdgasindustrie - Zentrierungseinrichtungen für Futterrohre - Teil 2: Anordnung des Zentrierers und Prüfung des Anschlagbundes (ISO 10427-2:2004)

Dieser Teil von ISO 10427 enthält Berechnungen zur Bestimmung der Abstände zwischen den einzelnen Zentrierern auf der Grundlage der Funktionsfähigkeit der Zentrierereinrichtung und des gewünschten
Abstandes zur Bohrlochwand bei Ablenkbohrungen und Bohrlochkrümmungen. Er enthält auch ein Verfahren zur Prüfung der Anschlagbunde und für die Aufzeichnung der Prüfergebnisse.

Industries du pétrole et du gaz naturel - Equipement de cimentation de puits - Partie 2: Mise en place des centreurs et essai des colliers d'arret (ISO 10427-2:2004)

L'ISO 10427-2:2004 fournit des calculs permettant de déterminer l'espacement entre les centreurs de cuvelage, fondés sur la performance du centreur et l'écartement excentré annulaire (appelé communément, distance de «standof») désiré, dans des puits de l'industrie du pétrole et du gaz naturel déviés et à coudes brusques (appelés communément «doglegs»). Elle fournit aussi un mode opératoire d'essai des colliers d'arrêt ainsi qu'un formulaire de rapport d'essais.

Petroleum and natural gas industries - Equipment for well cementing - Part 2: Centralizer placement and stop-collar testing (ISO 10427-2:2004)

General Information

Status
Published
Publication Date
31-Oct-2004
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Nov-2004
Due Date
01-Nov-2004
Completion Date
01-Nov-2004

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SLOVENSKI STANDARD
SIST EN ISO 10427-2:2004
01-november-2004
Petroleum and natural gas industries - Equipment for well cementing - Part 2:
Centralizer placement and stop-collar testing (ISO 10427-2:2004)
Petroleum and natural gas industries - Equipment for well cementing - Part 2: Centralizer
placement and stop-collar testing (ISO 10427-2:2004)
Erdöl- und Erdgasindustrie - Zentrierungseinrichtungen für Futterrohre - Teil 2:
Anordnung des Zentrierers und Prüfung des Anschlagbundes (ISO 10427-2:2004)
Industries du pétrole et du gaz naturel - Equipement de cimentation de puits - Partie 2:
Mise en place des centreurs et essai des colliers d'arret (ISO 10427-2:2004)
Ta slovenski standard je istoveten z: EN ISO 10427-2:2004
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
SIST EN ISO 10427-2:2004 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 10427-2:2004

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SIST EN ISO 10427-2:2004
EUROPEAN STANDARD
EN ISO 10427-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2004
ICS 75.180.10
English version
Petroleum and natural gas industries - Equipment for well
cementing - Part 2: Centralizer placement and stop-collar testing
(ISO 10427-2:2004)
Industries du pétrole et du gaz naturel - Equipement de Erdöl- und Erdgasindustrie - Zentriereinrichtungen für
cimentation de puits - Partie 2: Mise en place des centreurs Futterrohre - Teil 2: Anordnung des Zentrierers und Prüfung
et essai des colliers d'arrêt (ISO 10427-2:2004) des Anschlagbundes (ISO 10427-2:2004)
This European Standard was approved by CEN on 16 April 2004.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10427-2:2004: E
worldwide for CEN national Members.

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SIST EN ISO 10427-2:2004

EN ISO 10427-2:2004 (E)





Foreword


This document (EN ISO 10427-2:2004) has been prepared by Technical Committee ISO/TC 67
"Materials, equipment and offshore structures for petroleum and natural gas industries" in
collaboration with Technical Committee CEN/TC 12 "Materials, equipment and offshore
structures for petroleum and natural gas industries", the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by November 2004, and conflicting national
standards shall be withdrawn at the latest by November 2004.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 10427-2:2004 has been approved by CEN as EN ISO 10427-2:2004 without any
modifications.

2

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SIST EN ISO 10427-2:2004


INTERNATIONAL ISO
STANDARD 10427-2
First edition
2004-05-01


Petroleum and natural gas industries —
Equipment for well cementing —
Part 2:
Centralizer placement and stop-collar
testing
Industries du pétrole et du gaz naturel — Équipement de cimentation
de puits —
Partie 2: Mise en place des centreurs et essai des colliers d'arrêt




Reference number
ISO 10427-2:2004(E)
©
ISO 2004

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SIST EN ISO 10427-2:2004
ISO 10427-2:2004(E)
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Published in Switzerland

ii © ISO 2004 – All rights reserved

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SIST EN ISO 10427-2:2004
ISO 10427-2:2004(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Methods for estimating centralizer placement. 3
4.1 General. 3
4.2 Standoff ratio calculation. 4
4.3 Buoyed weight of casing. 5
4.4 Calculations for centralizer spacing . 6
5 Procedure for testing stop collars . 9
5.1 General. 9
5.2 Apparatus. 10
5.3 Test procedure . 11
5.4 Reporting of test results. 11
Annex A (informative) Documentation of stop-collar test results. 12
Bibliography . 14

© ISO 2004 – All rights reserved iii

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SIST EN ISO 10427-2:2004
ISO 10427-2:2004(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 10427-2 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures
for petroleum, petrochemical and natural gas industries, Subcommittee SC 3, Drilling and completion fluids,
and well cements.
This first edition of ISO 10427-2, together with ISO 10427-1 and ISO 10427-3, cancels and replaces
ISO 10427:1993, which has been technically revised.
ISO 10427 consists of the following parts, under the general title Petroleum and natural gas industries —
Equipment for well cementing:
 Part 1: Casing bow-spring centralizers
 Part 2: Centralizer placement and stop-collar testing
 Part 3: Performance testing of cementing float equipment
iv © ISO 2004 – All rights reserved

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SIST EN ISO 10427-2:2004
ISO 10427-2:2004(E)
Introduction
[1]
This part of ISO 10427 is based on API Specification 10D, 5th edition, January 1995 .
In this part of ISO 10427, where practical, U.S. Customary units are included in brackets for information.

© ISO 2004 – All rights reserved v

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SIST EN ISO 10427-2:2004

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SIST EN ISO 10427-2:2004
INTERNATIONAL STANDARD ISO 10427-2:2004(E)

Petroleum and natural gas industries — Equipment for well
cementing —
Part 2:
Centralizer placement and stop-collar testing
1 Scope
This part of ISO 10427 provides calculations for determining centralizer spacing, based on centralizer
performance and desired standoff, in deviated and dogleg holes in wells for the petroleum and natural gas
industries. It also provides a procedure for testing stop collars and reporting test results.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 11960, Petroleum and natural gas industries — Steel pipes for use as casing or tubing for wells
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
3.1
annular clearance for perfectly centred casing
wellbore diameter minus casing outside diameter divided by two
3.2
centralizer permanent set
change in centralizer bow height after repeated flexing
NOTE A bow-spring centralizer is considered to have reached permanent set after being flexed 12 times.
3.3
flexed
condition of a bow-spring when a force three times the specified minimum restoring force (± 5 %) has been
applied to it
[ISO 10427-1:2001, 3.1]
NOTE Specified minimum restoring force values are found in Table 1 of ISO 10427-1:2001.
© ISO 2004 – All rights reserved 1

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SIST EN ISO 10427-2:2004
ISO 10427-2:2004(E)
3.4
holding device
device employed to fix the stop collar or centralizer to the casing
EXAMPLE Set screws, nails, mechanical dogs and epoxy resins.
[ISO 10427-1:2001, 3.2]
3.5
holding force
maximum force required to initiate slippage of a stop collar on the casing
[ISO 10427-1:2001, 3.3]
3.6
hole size
diameter of the wellbore
[ISO 10427-1:2001]
3.7
limit clamp
equivalent term for a stop collar
3.8
restoring force
force exerted by a centralizer against the casing to keep it away from the wellbore wall
NOTE Restoring-force values can vary based on the installation methods.
[ISO 10427-1:2001, 3.5]
3.9
rigid centralizer
centralizer manufactured with bows, blades or bars that do not flex
NOTE Adapted from ISO 10427-1:2001, 3.6.
3.10
running force
maximum force required to move a centralizer through a specified wellbore diameter
NOTE Running-force values can vary based on the installation methods.
[ISO 10427-1:2001]
3.11
sag point
point where the casing deflection is at a maximum
NOTE Casing that is supported at two points will tend to sag between the support points, this sag is called the casing
sag or casing deflection.
3.12
slippage force range
range of forces required to continue to move a stop collar after the holding force has been overcome
2 © ISO 2004 – All rights reserved

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SIST EN ISO 10427-2:2004
ISO 10427-2:2004(E)
3.13
solid centralizer
centralizer manufactured in such a manner as to be a solid device with nonflexible fins or bands
NOTE These centralizers have solid bodies and solid blades.
3.14
standoff
smallest distance between the outside diameter of the casing and the wellbore
[ISO 10427-1:2001, 3.8]
3.15
standoff ratio
R
s
ratio of standoff to annular clearance for perfectly centred casing
NOTE 1 It is expressed as a percentage.
NOTE 2 Adapted from ISO 10427-1:2001, 3.9.
3.16
starting force
maximum force required to insert a centralizer into a specified wellbore diameter
NOTE Starting-force values can vary based on the installation methods.
[ISO 10427-1:2001, 3.10]
3.17
stop collar
device attached to the casing to prevent movement of a casing centralizer
NOTE A stop collar can be either an independent piece of equipment or integral with the centralizer.
[ISO 10427-1:2001, 3.11]
4 Methods for estimating centralizer placement
4.1 General
The equations presented below are based on certain assumptions and are considered sufficiently accurate for
general use. More specific calculations based on complete wellbore data may be available but are beyond the
scope of this document.
There is no recommendation or requirement for a specific standoff ratio for casing centralization. The standoff
ratio of 67 % is used in the specification for the purpose of setting a minimum standard for performance of
casing bow-spring centralizers only. This number is used only in the specifications for bow-spring type
centralizers and deals with the minimum force for each size of centralizer at that standoff. The 67 % standoff
ratio is not intended to represent the minimum acceptable amount of standoff required to obtain successful
centralization of the casing. The user is encouraged to apply the standoff ratio required for specific well
conditions based on well requirements and sound engineering judgement.
Even a minor change in inclination and/or azimuth, with the string of casing hanging below it, materially affects
the standoff and the requirements for centralizer placement.
© ISO 2004 – All rights reserved 3

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SIST EN ISO 10427-2:2004
ISO 10427-2:2004(E)
The lateral load (force) on a centralizer is composed of two components. The first is the weight component of
the section of pipe supported by the centralizer, and the second is the tension component exerted by the pipe
hanging below the centralizer.
4.2 Standoff ratio calculation
Annular clearance (l ) for perfectly centred casing can be calculated as follows (see Figure 1):
a
D − D
wp
l = (1)
a
2
where
l is the annular clearance for perfectly centred casing, expressed in metres (inches);
a
D is the wellbore diameter, expressed in metres (inches);
w
D is the casing outside diameter, expressed in metres (inches).
p
The standoff at the centralizer in a given hole size is represented by the symbol S (see Figure 1). The
c
standoff at a bow-spring centralizer is taken from the load deflection curve of the centralizer, tested in that
[2]
hole size, based upon the lateral load applied (see ISO 10427-1:2001, A.1 ).
NOTE Differences in hole size alter the load-deflection curve of a centralizer.
Since the bows or blades of a solid or rigid centralizer do not deflect, the standoff at the centralizer is
determined using the rigid or solid blade diameter as follows:
D − D
cp
S =
c
2
(2)
where
S is the standoff at the centralizer, ex
...

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