SIST EN ISO 10426-6:2008

Petroleum and natural gas industries - Cements and materials for well cementing - Part 6: Methods for determining the static gel strength of cement formulations (ISO 10426-6:2008)

This standard gives requirements and recommendations for the practices for side-pocket mandrels and related equipment

Erdöl- und Erdgasindustrie - Zemente und Materialien für die Zementation von Tiefbohrungen - Teil 6: Verfahren zur Bestimmung der statischen Gelfestigkeit von Zementzusammensetzungen (ISO 10426-6:2008)

Industries du pétrole et du gas naturel - Ciments et matériaux pour la cimentation des puits - Partie 6: Méthodes de détermination de la force statique du gel des formulations de ciment (ISO 10426-6:2008)

L'ISO 10426-6:2008 spécifie les exigences et fournit des méthodes d'essai permettant de déterminer la force statique du gel (SGS) des laitiers de ciment et des matériaux apparentés dans des conditions de puits simulées.

Industrija nafte in zemeljskega plina - Cementi in materiali za cementiranje vrtin - 6. del: Metode za določanje statične trdnosti gela cementnih mešanic (ISO 10426-6:2008)

General Information

• Status: Published
• Publication Date: 29-Jul-2008
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 14-Jul-2008
• Due Date: 18-Sep-2008
• Completion Date: 30-Jul-2008
• Ref Project: EN ISO 10426-6:2008 - Petroleum and natural gas industries - Cements and materials for well cementing - Part 6: Methods for determining the static gel strength of cement formulations (ISO 10426-6:2008)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 10426-6:2008
01-september-2008
,QGXVWULMDQDIWHLQ]HPHOMVNHJDSOLQD&HPHQWLLQPDWHULDOL]DFHPHQWLUDQMHYUWLQ
GHO0HWRGH]DGRORþDQMHVWDWLþQHWUGQRVWLJHODFHPHQWQLKPHãDQLF,62

Petroleum and natural gas industries - Cements and materials for well cementing - Part
6: Methods for determining the static gel strength of cement formulations (ISO 10426-
6:2008)
Erdöl- und Erdgasindustrie - Zemente und Materialien für die Zementation von
Tiefbohrungen - Teil 6: Verfahren zur Bestimmung der statischen Gelfestigkeit von
Zementzusammensetzungen (ISO 10426-6:2008)
Industries du pétrole et du gas naturel - Ciments et matériaux pour la cimentation des
puits - Partie 6: Méthodes de détermination de la force statique du gel des formulations
de ciment (ISO 10426-6:2008)
Ta slovenski standard je istoveten z: EN ISO 10426-6:2008
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
91.100.10 Cement. Mavec. Apno. Malta Cement. Gypsum. Lime.
Mortar
SIST EN ISO 10426-6:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 10426-6:2008

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SIST EN ISO 10426-6:2008
EUROPEAN STANDARD
EN ISO 10426-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2008
ICS 91.100.10; 75.020

English Version
Petroleum and natural gas industries - Cements and materials
for well cementing - Part 6: Methods for determining the static
gel strength of cement formulations (ISO 10426-6:2008)
Industries du pétrole et du gas naturel - Ciments et Erdöl- und Erdgasindustrie - Zemente und Materialien für
matériaux pour la cimentation des puits - Partie 6: die Zementation von Tiefbohrungen - Teil 6: Verfahren zur
Méthodes de détermination de la force statique du gel des Bestimmung der statischen Gelfestigkeit von
formulations de ciment (ISO 10426-6:2008) Zementzusammensetzungen (ISO 10426-6:2008)
This European Standard was approved by CEN on 21 June 2008.
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 CEN Management Centre 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 CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, 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
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10426-6:2008: E
worldwide for CEN national Members.

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SIST EN ISO 10426-6:2008
EN ISO 10426-6:2008 (E)
Contents Page
Foreword.3

2

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SIST EN ISO 10426-6:2008
EN ISO 10426-6:2008 (E)
Foreword
This document (EN ISO 10426-6:2008) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum and natural gas industries" in collaboration withTechnical
Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum, petrochemical 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 January 2009, and conflicting national standards shall be withdrawn at
the latest by January 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 10426-6:2008 has been approved by CEN as a EN ISO 10426-6:2008 without any
modification.

3

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SIST EN ISO 10426-6:2008

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SIST EN ISO 10426-6:2008

INTERNATIONAL ISO
STANDARD 10426-6
First edition
2008-07-01


Petroleum and natural gas industries —
Cements and materials for well
cementing —
Part 6:
Methods for determining the static gel
strength of cement formulations
Industries du pétrole et du gaz naturel — Ciments et matériaux pour
la cimentation des puits —
Partie 6: Méthodes de détermination de la force statique du gel
des formulations de ciment





Reference number
ISO 10426-6:2008(E)
©
ISO 2008

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SIST EN ISO 10426-6:2008
ISO 10426-6:2008(E)
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All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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ii © ISO 2008 – All rights reserved

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SIST EN ISO 10426-6:2008
ISO 10426-6:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Sampling.2
5 Preparation .2
6 Test method using rotating-type static gel strength apparatus .3
7 Test method using ultrasonic-type static gel strength apparatus .4
8 Test method using intermittent rotation-type static gel strength apparatus .6
Annex A (informative) Critical static gel strength — Additional information.8
Bibliography .9

© ISO 2008 – All rights reserved iii

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SIST EN ISO 10426-6:2008
ISO 10426-6:2008(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 10426-6 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.
ISO 10426 consists of the following parts, under the general title Petroleum and natural gas industries —
Cements and materials for well cementing:
⎯ Part 1: Specification
⎯ Part 2: Testing of well cements
⎯ Part 3: Testing of deepwater well cement formulations
⎯ Part 4: Preparation and testing of foamed cement slurries at atmospheric pressure
⎯ Part 5: Determination of shrinkage and expansion of well cement formulations at atmospheric pressure
⎯ Part 6: Methods for determining the static gel strength of cement formulations
iv © ISO 2008 – All rights reserved

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SIST EN ISO 10426-6:2008
ISO 10426-6:2008(E)
Introduction
Characterizing the static gel-strength (SGS) development of a cement slurry is an important design parameter
in specific cementing environments. These include shallow-water flow mitigation, plugging operations and
certain annular flow circumstances. Determining the gel-strength characteristics of a cement slurry allows the
user to ascertain if the cement design is fit for a particular intended purpose. Historically, the SGS of a cement
slurry was determined by a method using a couette-type rotational viscometer. More recently, specialized
instruments, including a rotating-type apparatus, an intermittent rotation-type apparatus and an ultrasonic-type
apparatus, have been used to measure the gel-strength development of a static cement slurry. This part of
ISO 10426 provides the testing protocol for determining SGS using these three types of instruments.
It is necessary to note due that, due to differences in sample size, apparatus configuration and method of
SGS determination, there can be considerable variance in results obtained by the three types of instruments
described in this part of ISO 10426.
CAUTION — Caution is necessary when using static gel-strength development testing results as the
single or predominant engineering parameter of a cement slurry design or technical evaluation.
In this part of ISO 10426, where practical, U.S. Customary (USC) units are included in brackets for information.
The units do not necessarily represent a direct conversion of SI to USC, or USC to SI, units. Consideration
has been given to the precision of the instrument making the measurement. For example, thermometers are
typically marked in one degree increments, thus temperature values have been rounded to the nearest degree.
In this part of ISO 10426, calibrating an instrument refers to ensuring the accuracy of the measurement.
Accuracy is the degree of conformity of a quantity to its actual or true value. Accuracy is related to precision,
or reproducibility of a measurement. Precision is the degree to which further measurements or calculations
show the same or similar results. Precision is characterized in terms of the standard deviation of the
measurement. The results of calculations or a measurement can be accurate but not precise, precise but not
accurate, neither or both. A result is valid if it is both accurate and precise.
Annex A of this part of ISO 10426 is for information only.

© ISO 2008 – All rights reserved v

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SIST EN ISO 10426-6:2008

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SIST EN ISO 10426-6:2008
INTERNATIONAL STANDARD ISO 10426-6:2008(E)

Petroleum and natural gas industries — Cements and materials
for well cementing —
Part 6:
Methods for determining the static gel strength of cement
formulations
1 Scope
This part of ISO 10426 specifies requirements and provides test methods for the determination of static gel
strength (SGS) of cement slurries and related materials under simulated well conditions.
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 standard
(including any amendments) applies.
ISO 10426-2:2003, Petroleum and natural gas industries — Cements and materials for well cementing —
Part 2: Testing of well cements
3 Terms and definitions
For the purposes of this part of ISO 10426, the following terms and definitions apply.
3.1
bottom-hole pressure
BHP
hydrostatic pressure at the bottom of the well calculated from the true vertical depth and the fluid densities in
the wellbore
3.2
bottom-hole circulating temperature
BHCT
maximum temperature encountered in a wellbore during cement slurry placement
3.3
critical static gel-strength period
CSGSP
time interval required for the cement to progress from the critical static gel strength value to a static gel
2
strength of 250 Pa (500 lbf/100 ft )
© ISO 2008 – All rights reserved 1

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SIST EN ISO 10426-6:2008
ISO 10426-6:2008(E)
3.4
critical static gel strength
CSGS
specific static gel strength of a cement in which hydrostatic-pressure equilibrium is reached between the
decayed hydrostatic pressure transmission of the cement column (and other fluids in the annulus) and the
pore pressure of the formation
See Annex A.
NOTE The critical static gel strength is measured in pascals or newtons per square metre (pounds force per 100
square feet).
3.5
static gel strength
SGS
shear strength (stress) measurement derived from the pressure required to move a gelled fluid through a pipe
or annulus of known length and geometry
NOTE The static gel strength is measured in pascals or newtons per square metre (pounds force per 100 square
feet).
4 Sampling
4.1 General
Samples of the dry cement or cement blend, solid and liquid additives and mixing water are required to test a
slurry in accordance with this part of ISO 10426. Accordingly, the best available sampling technology should
be employed to ensure the laboratory test conditions and materials match as closely as possible those found
at the well site.
4.2 Method
Applicable sampling techniques for the dry cement or cement blend, solid and liquid additives and mixing
water used in typical cementing operations can be found in ISO 10426-2:2003, Clause 4. If required, the
temperature of the mix water, cement or cement blends, and liquid additives may be measured with a
thermocouple or thermometer capable of measuring temperature with an accuracy of ± 2 °C (± 3 °F). These
temperatures should be recorded. Temperature-measuring devices shall be calibrated (in the case of a
thermocouple) no less frequently than every three months or checked (in the case of a thermometer) annually.
NOTE Descriptions of commonly used sampling devices can be found in ISO 10426-2:2003, Figure 1.
5 Preparation
Prepare the test samples in accordance with ISO 10426-2:2003, Clause 5. The laboratory temperature of the
cement sample and mix water should be within ± 2 °C (± 3 °F) of the respective temperature anticipated at the
well site. If field conditions are unknown, the temperature of the mix water and dry cement shall be
23 °C ± 2 °C (73 °F ± 3 °F) immediately prior to mixing.
If larger slurry volumes are needed, an alternative method for slurry preparation is found in ISO 10426-2:2003,
Clause A.1.
NOTE The density of the cement slurry can be verified by methods found in ISO 10426-2:2003, Clause 6.
2 © ISO 2008 – All rights reserved

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SIST EN ISO 10426-6:2008
ISO 10426-6:2008(E)
6 Test method using rotating-type static gel strength apparatus
6.1 Apparatus
The apparatus contains a pressure chamber that can be heated and pressurized according to a simulated
cement job schedule. The SGS is calculated from the torque required to rotate a paddle of known geometry at
very low speed. The rotation speed of the paddle during the SGS stirring portion of the test is normally a
continuous 0,000 009 2 r/s (0,2°/min). The initial stirring to simulate placement in the well is typically
conducted at 2,5 r/s ± 0,25 r/s (150 r/min ± 15 r/min). The rotating-type static gel strength apparatus shall be
calibrated according to the manufacturer’s instructions. During the test period, the temperature and pressure
of the slurry in the test cell is increased in accordance with the appropriate well-simulation test schedule (see
6.2.2). Determine the temperature of the cement slurry by use of an ASTM E220 classification “special”
type J thermocouple located in the centre of the testing cell. The temperature-measuring system shall be
calibrated to an accuracy of ± 2 °C (± 3 °F). Calibration shall be performed no less frequently than every three
months.
NOTE Changing the rotational speed of the apparatus can be required depending on slurry design. The permissible
range of rotational speed for the apparatus is 0,000 006 9 r/s (0,15°/min) to 0,000 023 1 r/s (0,5°/min).
6.2 Test procedure
6.2.1 If there is a batch mixing time being used for the job, the test schedule should include this segment.
The slurry should be exposed to the anticipated temperature conditions during the batch mixing time. The
pressure at this time shall be atmospheric. The stirring is typically maintained at 2,5 r/s ± 0,25 r/s
(150 r/min ± 5 r/min). If there is no batch mixing time, omit this step.
6.2.2 Calculate the expected time to bottom and the expected placement time required to displace the
cement to the zone of interest. Ramp the cement slurry to bottom-hole circulating temperature (BHCT) and
bottom-hole pressure (BHP) in the expected time to bottom. The slurry is then ramped to the circulating
temperature and pressure at the zone of interest. During the placement simulation, the temperature and
pressure shall be maintained within ± 3 °C (± 6 °F) and ± 2 MPa (± 300 psi) of the appropriate elapsed time
versus temperature and pressure target. Within 10 min of the end of the ramp, the temperature and pressure
shall be within ± 1 °C (± 2 °F) and ± 0,7 MPa (± 100 psi) of the specified values. After the circulating
temperature at the zone of interest is reached, hold at the specified temperature and pressure for 5 min ± 30 s
to allow for temperature stabilization to occur. The stirring is typically maintained at 2,5 r/s ± 0,25 r/s
(150 r/min ± 15 r/min). The time interval to ramp to the circulating temperature and pressure at the zone of
interest is the expected placement time, minus the expected time to bottom. In cases when an extended
period of slurry fluidity is expected, the test temperature may be increased to BHCT in 240 min after reaching
the circulating temperature at the zone of interest.
NOTE During the time of stirring at ISO rotational speeds, the test gives an indication of the slurry consistency. It is
not an exact slurry consistency since the paddle does not conform to the ISO dimensions for a paddle used to determine
the thickening time of a slurry.
6.2.3 For the SGS determination, at the end of the slurry placement simulation, the rotational speed is
changed from the typical 2,5 r/s ± 0,25 r/s (150 r/min ± 15 r/min) to 0,000 009 2 r/s (0,2°/min) or other
permissible rotational speed. Maintain circulating temperature and pressure at the zone of interest. During
SGS determination the temperature and pressure shall be maintained within ± 1 °C (± 2 °F) and ± 0,7 MPa
(± 100 psi) of the target values.
6.2.4 Re
...