prEN ISO 10426-2

Petroleum and natural gas industries - Cements and materials for well cementing - Part 2: Testing of well cements (ISO/DIS 10426-2:2010)

2017-06-09: WI abandoned to follow cancellation of WI at ISO level (see ISO notification to dataservice on 2017-06-09).

Erdöl- und Erdgasindustrie - Zemente und Materialien für die Zementation von Tiefbohrungen - Teil 2: Prüfung von Bohrloch-Zemente (ISO/DIS 10426-2:2010)

Industries du pétrole et du gaz naturel - Ciments et matériaux pour la cimentation des puits - Partie 2: Essais de ciment pour puits (ISO/DIS 10426-2:2010)

Industrija za predelavo nafte in zemeljskega plina – Cementi in materiali za cementiranje vrtin – 2. del: Preskušanje cementov za vrtine (ISO/DIS 10426-2:2010)

General Information

• Status: Not Published
• ICS: 75.020 - Extraction and processing of petroleum and natural gas
• ICS: 75.180.10 - Exploratory, drilling and extraction equipment
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Drafting Committee: CEN/TC 12 - Materials, equipment and offshore structures for petroleum and natural gas industries
• Current Stage: 4098 - Decision to abandon - Enquiry
• Due Date: 08-Nov-2011
• Completion Date: 09-Jun-2017
• Ref Project: oSIST prEN ISO 10426-2:2010 - Petroleum and natural gas industries - Cements and materials for well cementing - Part 2: Testing of well cements (ISO/DIS 10426-2:2010)

Overview

The standard prEN ISO 10426-2:2010 addresses the petroleum and natural gas industries' requirements for testing well cements and cementing materials used in well construction. This document, developed under the collaboration of ISO/TC 67 and CEN/TC 12 technical committees, provides detailed guidelines and procedures for the comprehensive evaluation of well cements. Although this draft standard was later abandoned following cancellation of the work item at the ISO level, it reflects important methodologies and testing protocols critical in the quality assurance of cement used in oil and gas well cementing operations.

Key Topics

This standard covers critical aspects related to testing well cements to ensure they meet performance and safety criteria in the demanding petroleum and natural gas environments. Key topics include:

• Sampling Procedures
  Guidelines for collecting cement samples at field locations, blending facilities, and handling additives and mixing water to ensure representative test specimens.

• Slurry Preparation and Conditioning
  Detailed steps for slurry preparation, including apparatus specifications, conditioning of test fluids, and procedures for achieving consistent slurry characteristics.

• Physical and Mechanical Testing

  • Slurry Density Measurement
  • Compressive Strength Testing simulating wellbore conditions with standardized apparatus and curing protocols.
  • Non-Destructive Sonic Strength Testing for assessing cement integrity without damage.

• Rheology and Gel Strength Evaluation
  Rotational viscometer methods to measure cement slurry rheological properties and gel strength, essential for predicting flow behavior during cementing.

• Fluid-Loss Control
  Static fluid-loss tests that assess the loss of cement slurry liquid into porous formations, impacting cement bond quality.

• Slurry Stability and Compatibility
  Stability tests including sedimentation and free fluid measurement, alongside compatibility evaluations with wellbore fluids to prevent adverse chemical interactions during cement placement.

Applications

prEN ISO 10426-2:2010 is designed to support a range of practical applications in the oil and gas well construction industry:

• Quality Control of Well Cements
  Ensures that cement blends and additives meet specified performance standards before deployment in wells.

• Cementing Design Verification
  Provides test methods for verifying designed cement slurries' suitability for specific wellbore conditions - temperature, pressure, and chemical environment.

• Operational Safety and Well Integrity
  Reliable testing improves cement sheath quality, preventing fluid migration and ensuring zonal isolation, thereby enhancing well safety and longevity.

• Research and Development
  Facilitates development of new cement formulations by standardized testing, enabling benchmarking and regulatory compliance.

Related Standards

prEN ISO 10426-2:2010 is part of a broader framework of standards addressing well cementing in the petroleum industry, including:

• ISO 10426-1 - Materials for well cementing - Part 1: Specification and testing of basic materials
• API standards for well cementing that complement ISO requirements with industry-specific guidelines
• Other ISO/TC 67 standards covering materials, equipment, and offshore structures in petroleum and natural gas industries.

These related standards collectively ensure global consistency in well cement quality, testing, and application methodologies critical for safe and efficient hydrocarbon extraction.

---

Keywords: well cement testing, petroleum industry standards, natural gas, cement slurry testing, cement compressive strength, slurry rheology, fluid-loss test, wellbore integrity, cement additives, ISO 10426, CEN standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2010
Industrija za predelavo nafte in zemeljskega plina – Cementi in materiali za
cementiranje vrtin – 2. del: Preskušanje cementov za vrtine (ISO/DIS 10426-2:2010)
Petroleum and natural gas industries - Cements and materials for well cementing - Part
2: Testing of well cements (ISO/DIS 10426-2:2010)
Erdöl- und Erdgasindustrie - Zemente und Materialien für die Zementation von
Tiefbohrungen - Teil 2: Prüfung von Bohrloch-Zemente (ISO/DIS 10426-2:2010)
Industries du pétrole et du gaz naturel - Ciments et matériaux pour la cimentation des
puits - Partie 2: Essais de ciment pour puits (ISO/DIS 10426-2:2010)
Ta slovenski standard je istoveten z: prEN ISO 10426-2
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
91.100.10 Cement. Mavec. Apno. Malta Cement. Gypsum. Lime.
Mortar
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2010
ICS 75.020; 91.100.10 Will supersede EN ISO 10426-2:2003
English Version
Petroleum and natural gas industries - Cements and materials
for well cementing - Part 2: Testing of well cements (ISO/DIS
10426-2:2010)
Industries du pétrole et du gaz naturel - Ciments et Erdöl- und Erdgasindustrie - Zemente und Materialien für
matériaux pour la cimentation des puits - Partie 2: Essais die Zementation von Tiefbohrungen - Teil 2: Prüfung von
de ciment pour puits (ISO/DIS 10426-2:2010) Bohrloch-Zemente (ISO/DIS 10426-2:2010)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 12.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Croatia, 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 10426-2:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3

Foreword
This document (prEN ISO 10426-2:2010) has been prepared by Technical Committee ISO/TC 67 "Materials,
equipment and offshore structures for petroleum, petrochemical and natural gas industries" in collaboration
with Technical 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 document is currently submitted to the parallel Enquiry.
This document will supersede EN ISO 10426-2:2003.
Endorsement notice
The text of ISO/DIS 10426-2:2010 has been approved by CEN as a prEN ISO 10426-2:2010 without any
modification.
DRAFT INTERNATIONAL STANDARD ISO/DIS 10426-2
ISO/TC 67/SC 3 Secretariat: SN
Voting begins on Voting terminates on

2010-03-18 2010-08-18
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION  •  МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ  •  ORGANISATION INTERNATIONALE DE NORMALISATION

Petroleum and natural gas industries — Cements and materials
for well cementing —
Part 2:
Testing of well cements
Industries du pétrole et du gaz naturel — Ciments et matériaux pour la cimentation des puits —
Partie 2: Essais de ciment pour puits
(Revision of first edition of ISO 10426-2:2003, of ISO 10426-2:2003/Cor.1:2006 and of
ISO 10426-2:2003/Amd.1:2005)
ICS 75.020; 91.100.10
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.

In accordance with the provisions of Council Resolution 15/1993 this document is circulated
in the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est
distribué en version anglaise seulement.

To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.

THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO
AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH
REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY
ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
©  International Organization for Standardization, 2010

ISO/DIS 10426-2
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ii © ISO 2010 – All rights reserved

ISO/DIS 10426-2
Contents Page
Foreword .vi
Introduction.vii
1 Scope.8
2 Normative references.8
3 Terms, definitions, and symbols .8
3.1 Terms and definitions .8
3.2 Symbols.13
4 Sampling.14
4.1 General .14
4.2 Sampling cement at a field location .15
4.3 Sampling cement blends at a blending facility .15
4.4 Sampling dry cement additives .15
4.5 Sampling liquid cement additives .15
4.6 Sampling mixing water .15
4.7 Shipping and storage.17
4.8 Sample preparation prior to testing .17
4.9 Sample disposal .17
5 Preparation of slurry .17
5.1 General .17
5.2 Apparatus.17
5.3 Procedure.19
5.4 Test fluid conditioning.21
6 Determination of slurry density .23
6.1 Apparatus.23
6.2 Procedure.23
7 Well-simulation compressive strength tests.24
7.1 General .24
7.2 Sampling.24
7.3 Apparatus.24
7.4 Procedure.26
7.5 Determination of cement compressive strength at the top of a long cement column.28
8 Non-destructive sonic strength testing of cement .34
8.1 General .34
8.2 Apparatus.34
8.3 Sampling.34
8.4 Preparation of slurry .34
8.5 Procedure.34
8.6 Curing time.34
8.7 Curing schedules .34
8.8 Data reporting .35
9 Well-simulation thickening time tests .35
9.1 General .35
9.2 Apparatus and material.35
9.3 Test procedure.37
9.4 Determination of test schedule.39
10 Static fluid-loss tests .46
10.1 General .46
DRAFT 2010
ISO/DIS 10426-2
10.2 Apparatus .46
10.3 Safety .47
10.4 Performing static fluid-loss test using non-stirred fluid-loss cell.47
10.5 Performing a static fluid-loss test using stirred fluid-loss apparatus .51
10.6 Fluid-loss results and reporting.54
11 Determination of rheological properties and gel strength using a rotational viscometer.56
11.1 General.56
11.2 Apparatus .56
11.3 Calibration .61
11.4 Determination of rheological properties .61
11.5 Determination of gel strength.62
11.6 Characterization of rheological behaviour.63
12 Well-simulation slurry stability tests .65
12.1 Introduction.65
12.2 Slurry mixing and conditioning.65
12.3 Free-fluid test with heated static period.65
12.4 Free-fluid test with static period at ambient temperature .66
12.5 Sedimentation test.67
13 Compatibility of wellbore fluids .72
13.1 General.72
13.2 Preparation of test fluids .73
13.3 Rheological properties.75
13.4 Thickening time.77
13.5 Compressive strength.77
13.6 Solids suspension and static gel strength .77
13.7 Spacer surfactant screening test (SSST) .77
13.8 Interpretation.79
14 Pozzolans .82
14.1 General.82
14.2 Types of pozzolan.82
14.3 Physical and chemical properties.82
14.4 Slurry calculations.84
14.5 Bulk volume of a blend .85
15 Test procedure for arctic cementing slurries .85
15.1 General.85
15.2 Preparation of cement slurry.86
15.3 Fluid fraction .86
15.4 Thickening time.86
15.5 Compressive strength.86
15.6 Strength after freeze-thaw cycling at atmospheric pressure.87
Annex A (normative) Procedure for preparation of large slurry volumes.88
A.1 General.88
A.2 Apparatus .88
A.3 Procedure .89
Annex B (normative) Calibration and verification of well cement testing equipment .90
B.1 Overview .90
B.2 General.90
B.3 Requirements.94
Annex C (normative) Alternative apparatus for well-simulation thickening-time tests.103
C.1 General.103
C.2 Apparatus .103
C.3 Calibration .105
C.4 Test procedure.105
Annex D (informative) Cementing temperatures and schedules .107
Bibliography .112
iv © ISO 2009 – All rights reserved

DRAFT 2010
ISO/DIS 10426-2
DRAFT 2010
ISO/DIS 10426-2
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 10426-2 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 second edition cancels and replaces the first edition, which has been technically revised.
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
vi © ISO 2009 – All rights reserved

DRAFT 2010
ISO/DIS 10426-2
Introduction
Users of this part of ISO 10426 should be aware that further or differing requirements may be needed for
individual applications. This part of ISO 10426 is not intended to inhibit a vendor from offering, or the
purchaser from accepting, alternative equipment or engineering solutions for the individual application. This
may be particularly applicable where there is innovative or developing technology. Where an alternative is
offered, the vendor should identify any variations from this part of ISO 10426 and provide details.
In this part of ISO 10426, where practical, US Customary units are included in brackets for information. The
units do not necessarily represent a direct conversion of SI to US Customary units, or US Customary to SI.
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 assuring the accuracy of the measurement.
Accuracy is the degree of conformity of a measurement 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 will 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 and both. A result is valid if it is both accurate and precise.
Well cement classes and grades are defined in ISO 10426-1.
WARNING — This procedure requires the handling of hot, pressurized equipment and materials that
may be hazardous and can cause injury. Do not exceed manufacturer's safety limits. Only trained
personnel should perform these tests.

DRAFT 2010
ISO/DIS 10426-2
Petroleum and natural gas industries — Cements and materials
for well cementing — Part 2: Testing of well cements
1 Scope
This part of ISO 10426 specifies methods and gives recommendations for the testing 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
document (including any amendments) applies.
ISO 10414-1, Petroleum and natural gas industries — Field testing of drilling fluids — Part 1: Water-based
fluids
ISO 10414-2, Petroleum and natural gas industries — Field testing of drilling fluids — Part 2: Oil-based fluids
ISO 10426-1, Petroleum and natural gas industries — Cements and materials for well cementing — Part 1:
Specification
ISO 13503-3, Petroleum and natural gas industries — Completion fluids and materials — Part 3: Testing of
heavy brines
ASTM C 109/C 109M-07, Standard test method for compressive strength of hydraulic cement mortars (using
2 in. or [50 mm] cube specimens)
ASTM C 188-95, Standard test method for density of hydraulic cement
ASTM C 618-08, Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in
Concrete
ASTM E 220-07a, Standard Test Method for Calibration of Thermocouples by Comparison Techniques
3 Terms, definitions, and symbols
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
absolute density
density of a material without the fluid around the particles. It is similar to the relative density and can be
obtained by multiplying the relative density of a material by the density of water at 4 °C, 1000 kg/m (8,345 4
lbm/gal
3.1.2
absolute volume
reciprocal of absolute density
8 © ISO 2009 – All rights reserved

DRAFT 2010
ISO/DIS 10426-2
3.1.3
additive
material added to a cement slurry to modify or enhance some desired property
3.1.4
annulus
space between the pipe and the wellbore wall or an outer pipe
3.1.5
batch mix
process of mixing the entire volume of cement slurry prior to placement in the wellbore
3.1.6
Bearden units of consistency
B
c
units used to express consistency of a cement slurry when determined using a pressurized consistometer
3.1.7
bottomhole circulating temperature (T )
BHC
temperature found at the bottom of the wellbore while the well is being circulated
3.18
bulk density
mass per unit volume of a dry material including the air between particles
3.1.9
casing cementing
process of placing cement to fill or partially fill the space between a full string of casing and the wellbore
3.1.10
cement
Portland cement
material formed by the grinding of clinker generally consisting of hydraulic calcium silicates and aluminates
and usually containing one or more of the forms of calcium sulfate added during grinding
3.1.11
cement blend
mixture of dry cement and other dry materials
3.1.12
cement class
designation under the ISO system of classifications of well cement according to defined specifications of
ISO 10426-1
3.1.13
cement grade
designation under the ISO system for denoting the sulfate resistance of a particular cement according to
specifications of ISO 10426-1
3.1.14
clinker
fused materials from the kiln that are interground with calcium sulfate to manufacture cement
3.1.15
compatibility
capacity to form a fluid mixture that does not undergo undesirable chemical and/or physical reactions
DRAFT 2010
ISO/DIS 10426-2
3.1.16
compressive strength
strength of a set cement sample measured by the force required to cause it to fail in compression.
Compressive strength is expressed as force per unit area.
3.1.17
consistometer
device used to measure the thickening time of a cement slurry under temperature and pressure
NOTE An atmospheric consistometer can be used to condition fluids prior to testing and for determining the
thickening time of arctic slurries.
3.1.18
continuous-pumping squeeze-cementing operation
squeeze-cementing operation that does not involve interruptions in pumping
3.1.19
drilling fluid
fluid used during the drilling of the well to remove cuttings, cool the drill bit and prevent formation fluids from
entering the wellbore
3.1.20
equivalent sack
mass of the blend of fly ash or pozzolan and Portland cement that has the same absolute volume as a sack
(94 lbm) of Portland cement
3.1.21
filtrate
liquid that is forced out of a cement slurry during a fluid loss test
3.1.22
fly ash
finely divided residue from the combustion of ground or powdered coal. Fly ash has pozzolanic properties
NOTE See Clause 14 for further description.
3.1.23
free fluid
coloured or colourless liquid that has separated from a cement slurry when standing in a static condition
3.1.24
freeze-thaw cycle
a prescribed cycle of exposure of a cement sample to temperatures above and below the freezing point of
water
3.1.25
heat-up rate
R
h
rate of slurry temperature change from the surface slurry temperature, T , to the predicted bottom-hole
SS
circulating temperature, T
PBHC
3.1.26
hesitation-squeeze-cementing operation
method of placement of cement during squeeze-cementing operation that involves alternate pumping and
non-pumping periods
3.1.27
liner cementing
annular cementing operations for which the top of the casing being cemented does not reach the surface
10 © ISO 2009 – All rights reserved

DRAFT 2010
ISO/DIS 10426-2
3.1.28
load frame
frame to place a load on cement blocks until they fail, in order to determine their compressive strength
3.1.29
mud
a fluid, generally viscosified and possibly weighted, that is circulated through the wellbore during drilling or
workover operations
3.1.30
plug cementing
process of placing a volume of cement in a well to form a plug across the wellbore
3.1.31
pozzolan
siliceous or siliceous and aluminous material that, in themselves, possess little or no cementitious value but, in
finely divided form and in the presence of moisture, reacts with calcium hydroxide to form a cementitious
material
NOTE See Clause 14 for further description.
3.1.32
preflush
fluid that is not viscosified nor densified with insoluble, solid weighting agents
3.1.33
pressure-down rate
R
pd
rate at which pressure is reduced from the bottom-hole pressure, p , to the pressure at the top of cement
BH
column, p , during a thickening-time test
TOC
3.1.34
pressure-up rate
R
pu
rate at which pressure is increased from the starting pressure to the bottom-hole pressure during a thickening-
time test
3.1.35
pressurized curing chamber
apparatus used for curing a sample of cement under temperature and pressure for subsequent tests such as
compressive strength, sedimentation, and so forth
3.1.36
pressurized fluid density balance
beam-type balance used to measure fluid density under pressure to minimize the effects of air entrained in the
fluid
3.1.37
relative density
specific gravity
ratio of the mass of a substance to the mass of an equal volume of a standard substance at a reference
temperature
NOTE The standard substance is usually water; the reference temperature is usually 4 °C.
3.1.38
sack
a unit of measure of cement that occupies a bulk volume of one cubic foot (normally 94 lbm for Portland
cement)
DRAFT 2010
ISO/DIS 10426-2
3.1.39
sedimentation
separation and settling of solids in a cement slurry
3.1.40
slurry container
container used to hold the slurry in a consistometer for conditioning or testing
3.1.41
slurry stability test
test to determine the degree of sedimentation and/or free fluid development in a cement slurry
3.1.42
sonic strength
compressive strength of a cement sample obtained by measuring the velocity of sound through the cement
and computing the strength using a correlation to compressive strength measurements
3.1.43
spacer
viscosified fluid that may be densified with insoluble, solid weighting agents. Spacers are used to separate
drilling fluids and cement slurries
3.1.44
squeeze-cementing
remedial process in which cement slurry is forced under pressure into a specific portion of the well such as a
fracture or opening
3.1.45
starting pressure
p
S
initial pressure applied to the test sample at the beginning of the thickening-time test
3.1.46
static fluid loss test
test to determine filtrate lost from a cement slurry when placed against a 325 mesh screen at 6 900 kPa
(1 000 psi) differential pressure
3.1.47
static stability test
test to determine the degree of sedimentation and free fluid development in a cement slurry
3.1.48
stirred fluid-loss apparatus
apparatus specially designed to allow for conditioning of the cement slurry within the same cell used to
perform a static fluid loss test
3.1.49
thickening time
time elapsed from the initial application of pressure and temperature to the time at which the slurry reaches a
consistency deemed sufficient to make it unpumpable (for example, 70 B or 100 B ).
c c
NOTE The results of a thickening-time test provide an indication of the length of time a cement slurry can remain
pumpable under the test conditions.
3.1.50
weigh batch mixer
scale tank
device or system for the weighing and blending of cement with dry additives for a cementing operation
12 © ISO 2009 – All rights reserved

DRAFT 2010
ISO/DIS 10426-2
3.1.51
well simulation test
test whose parameters are designed and modified as required to simulate the conditions found in a wellbore
3.2 Symbols
For the purposes of this part of ISO 10426, the symbols given in Table 1 apply. This list is not exhaustive.
Table 1 — Symbols
Symbol Meaning
B consistency expressed in Bearden units
c
g acceleration of freefall
h top-of-cement true vertical depth
TOCTVD
h true vertical depth
TVD
k consistency index
m mass
m additive mass
a
m cement mass
c
m slurry mass
s
m water mass
w
n dimensionless flow behaviour index
a
p bottom-hole pressure
BH
p starting pressure
S
p top-of-cement pressure
TOC
q pump rate
R rate of temperature change
ΔT
R rate of pressure decrease
pd
R rate of pressure increase
pu
T torque
TT transit time
T bottom-hole circulating temperature
BHC
T bottom-hole static temperature
BHS
T predicted bottom-hole circulating temperature
PBHC
T predicted squeeze temperature
PS
T predicted plug temperature
PP
T predicted bottom-hole squeeze or plug temperature
PSP
b
Δ pseudo-temperature gradient
PT
T slurry surface temperature
SS
T top-of-cement circulating temperature
TOCC
T top-of-cement static temperature
TOCS
t elapsed time
t time to displace the leading edge of the cement slurry from
a
DRAFT 2010
ISO/DIS 10426-2
Symbol Meaning
bottom of the casing to the top of the annular column
t time to displace the leading edge of cement slurry from the
d
surface to the bottom of the wellbore
V final packed volume
fp
V volume of filtrate collected at 30 minutes
V additive absolute volume
abs
V annular volume of cement
a
V cement absolute volume
c
V volume of free fluid
F
V volume of the pipe
p
V slurry volume
s
V volume of filtrate collected at the time nitrogen blows through
t
V water volume
w
Z acoustic impedance
γ shear rate
μ plastic viscosity
p
Δρ density of the set cement relative to the cement slurry
sc
ρ density of additive
a
ρ average bulk density
bulk
ρ density of cement
c
ρ density of annular fluid
af
ρ density of drilling fluid
df
ρ loose apparent bulk density
LAB
ρ packed apparent bulk density
PAB
ρ density of slurry
s
ρ density of the set cement segment
set
ρ density of water
w
τ shear stress
τy yield stress
φ fluid fraction
a Hydrostatic pressure at the bottom of the well, calculated using the true vertical depth and the fluid
densities in the wellbore.
b Gradient in °C/100 m (°F/100 ft), calculated from the difference between the maximum recorded bottom-
hole static temperature and 80 °F.
4 Sampling
4.1 General
Samples of the cement, cement blend, solid and liquid additives, and mixing water may be required to test a
slurry in accordance with this part of ISO 10426. Some commonly used sampling techniques are described in
this clause.
14 © ISO 2009 – All rights reserved

DRAFT 2010
ISO/DIS 10426-2
4.2 Sampling cement at a field location
Multiple samples should be extracted using a suitable device (Figure 1). A composite of the samples should
be prepared, packaged, and labelled (see 4.7). Sample volume should be sufficient to perform the desired
testing.
4.3 Sampling cement blends at a blending facility
Cement blends may be sampled from the weigh batch mixer (scale tank), bulk transport, or extracted from the
flow lines during transfer. The cement and dry additives should be thoroughly blended prior to sampling.
Samples from the bulk container may be extracted in accordance with 4.2. Samples extracted from a flow line
during a transfer may be taken from a properly installed sample valve, diverted flow sampler, or automatic in-
line sampling device (Figure 1c, 1d and 1e) using a procedure designed to give a representative sample of the
blend being transferred. The samples should be prepared, packaged, and labelled (4.7). Sample volume
should be sufficient to perform the desired testing.
4.4 Sampling dry cement additives
Dry cement additive samples may be extracted from a bulk container or sack. Multiple samples should be
extracted from the center of the source using a suitable sampling device (Figure 1a or 1b). A composite of the
samples from the same lot should be prepared, packaged, and labelled (4.7). The volume of each dry cement
additive sample should be sufficient to perform the desired testing.
4.5 Sampling liquid cement additives
Most liquid additives are solutions or suspensions of dry materials. Storage can allow separation of the active
ingredients. Thus, the active ingredients may float to the top of the container, be suspended as a phase layer,
or settle to the bottom. For these reasons, liquid additives should be thoroughly mixed prior to sampling. The
sample should then be extracted from the center of the container using a clean, dry sampling device. A
composite of the samples from the same lot should be prepared, packaged, and labelled (4.7). The volume of
each liquid additive sample should be sufficient to perform the desired testing.
4.6 Sampling mixing water
The mixing water should be sampled from the source or from the tank in which it is stored just prior to mixing.
The sample should be ex
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