EN ISO 13500:2008

SLOVENSKI STANDARD
01-januar-2009
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SIST EN ISO 13500:2006
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Petroleum and natural gas industries - Drilling fluid materials - Specifications and tests
(ISO 13500:2008)
Erdöl- und Erdgasindustrie - Bohrspülungen - Spezifikationen und Prüfungen (ISO
13500:2008)
Industries du pétrole et du gaz naturel - Produits pour fluides de forage - Spécifications
et essais (ISO 13500:2008)
Ta slovenski standard je istoveten z: EN ISO 13500:2008
ICS:
75.180.10 Oprema za raziskovanje in Exploratory and extraction
odkopavanje equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 13500
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2008
ICS 75.180.10 Supersedes EN ISO 13500:2006
English Version
Petroleum and natural gas industries - Drilling fluid materials -
Specifications and tests (ISO 13500:2008)
Industries du pétrole et du gaz naturel - Produits pour Erdöl- und Erdgasindustrie - Bohrspülungen -
fluides de forage - Spécifications et essais (ISO Spezifikationen und Prüfungen (ISO 13500:2008)
13500:2008)
This European Standard was approved by CEN on 12 October 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 13500:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 13500:2008) 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, 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 May 2009, and conflicting national standards shall be withdrawn at the
latest by May 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.
This document supersedes EN ISO 13500:2006.
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 13500:2008 has been approved by CEN as a EN ISO 13500:2008 without any modification.

INTERNATIONAL ISO
STANDARD 13500
Third edition
2008-11-01
Petroleum and natural gas industries —
Drilling fluid materials — Specifications
and tests
Industries du pétrole et du gaz naturel — Produits pour fluides de
forage — Spécifications et essais

Reference number
ISO 13500:2008(E)
©
ISO 2008
ISO 13500:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 13500:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviations . 1
4 Requirements . 4
5 Calibration . 4
6 Packaged material . 11
7 Barite. 13
8 Haematite (hematite). 22
9 Bentonite . 30
10 Non-treated bentonite. 34
11 OCMA grade bentonite. 36
12 Attapulgite . 40
13 Sepiolite . 43
14 Technical-grade low-viscosity CMC (CMC-LVT). 46
15 Technical-grade high-viscosity CMC (CMC-HVT). 50
16 Starch. 55
17 Low-viscosity polyanionic cellulose (PAC-LV). 59
18 High-viscosity polyanionic cellulose (PAC-HV) . 66
19 Drilling-grade xanthan gum . 71
Annex A (informative) Mineral impurities in barite . 83
Annex B (informative) Test precision. 84
Annex C (informative) Examples of calculations . 89
Bibliography . 93

ISO 13500:2008(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 13500 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 third edition cancels and replaces the second edition (ISO 13500:2006), subclauses 7.1.2/Table 2, 7.3.1,
8.5.2, 8.6.5, 8.13.4, 10.2.5, 11.4, 14.4.3, and 15.4.3 of which have been technically revised. Clause 17 on low-
viscosity polyanionic cellulose, Clause 18 on high-viscosity polyanionic cellulose, and Clause 19 on drilling-
grade xanthan gum have been added.

iv © ISO 2008 – All rights reserved

ISO 13500:2008(E)
Introduction
This International Standard covers materials that are in common usage in petroleum and natural-gas drilling
fluids. These materials are used in bulk quantities, can be purchased from multiple sources and are available
as commodity products. No single-source or limited-source products are included, nor are speciality products.
International Standards are published to facilitate communication between purchasers and manufacturers, to
provide interchangeability between similar equipment and materials purchased from different manufacturers
and/or at different times and to provide an adequate level of safety when the equipment or materials are
utilized in the manner and for the purposes intended. This International Standard provides minimum
requirements and is not intended to inhibit anyone from purchasing or producing materials to other standards.
This International Standard is substantially based on API Spec 13A, 16th Edition, February 1, 2004. The
purpose of this International Standard is to provide product specifications for barite, haematite, bentonite,
nontreated bentonite, Oil Companies' Materials Association (OCMA) grade bentonite, attapulgite, sepiolite,
technical-grade low-viscosity carboxymethylcellulose (CMC-LVT), technical-grade high-viscosity
carboxymethylcellulose (CMC-HVT), starch, low-viscosity polyanionic cellulose, high-viscosity polyanionic
cellulose and drilling-grade Xanthomaonas campestris.
The intent of the document is to incorporate all International Standards for drilling fluid materials into an ISO-
formatted document. A survey of the industry found that only the American Petroleum Institute (API) issued
testing procedures and specification standards for these materials.
Reference to OCMA materials has been included in API work, as the OCMA and subsequent holding
committees were declared defunct, and all specifications were submitted to API in 1983.
Annex A (informative) lists the mineral impurities in barite, Annex B (informative) provides the test precision
and Annex C (informative) details examples of calculations.

INTERNATIONAL STANDARD ISO 13500:2008(E)

Petroleum and natural gas industries — Drilling fluid
materials — Specifications and tests
1 Scope
This International Standard covers physical properties and test procedures for materials manufactured for use
in oil- and gas-well drilling fluids. The materials covered are barite, haematite, bentonite, nontreated bentonite,
OCMA-grade bentonite, attapulgite, sepiolite, technical-grade low-viscosity carboxymethylcellulose
(CMC-LVT), technical-grade high-viscosity carboxymethylcellulose (CMC-HVT), starch, low-viscosity
polyanionic cellulose (PAC-LV), high-viscosity polyanionic cellulose (PAC-HV) and drilling-grade
Xanthomonas campestris (Xanthan gum). This International Standard is intended for the use of manufacturers
of named products.
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 6780, Flat pallets for intercontinental materials handling — Principal dimensions and tolerances
ISO 10414-1:2008, Petroleum and natural gas industries — Field testing of drilling fluids — Part 1: Water-
based fluids
ASTM D422, Standard Test Method for Particle-Size Analysis of Soils
ASTM E11, Standard Specification for Wire Cloth and Sieves for Testing Purposes
ASTM E161, Standard Specification for Precision Electroformed Sieves
ASTM E77, Standard Test Method for Inspection and Verification of Thermometers
ASTM E177, Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
NIST (NBS) Monograph 150, Liquid-In-Glass Thermometry
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
ACS reagent grade
chemicals that meet purity standards as specified by the American Chemical Society (ACS)
ISO 13500:2008(E)
3.1.2
flash side
side containing residue (“flash”) from stamping, or the side with concave indentation
3.2 Symbols and abbreviations
ACS American Chemical Society
API American Petroleum Institute
APME Association of Plastic Manufacturers in Europe
ASTM American Society for Testing and Materials
EDTA Ethylenediaminetetraacetic acid
CAS Chemical Abstracts Service
CMC-HVT Carboxymethylcellulose — High-viscosity, technical-grade
CMC-LVT Carboxymethylcellulose — Low-viscosity, technical-grade
OCMA Oil Companies' Materials Association
NBS National Bureau of Standards
NIST National Institute of Standards and Technology
TC to contain
TD to deliver
B hydrometer correction curve intercept
c
b yield point/plastic viscosity ratio
D equivalent particle diameter immediately greater than 6 µm, determined in Equation (9)
D equivalent particle diameter immediately less than 6 µm, determined in Equation (9)
D equivalent spherical diameter, expressed in micrometres
e
C calibration correction
c
C 40 times the EDTA volume, expressed in millilitres
m
K sample constant
S
L effective depth, expressed in centimetres
log(η /η ) correction for temperature variance
20 θ
M hydrometer correction curve slope
c
m sample mass, expressed in grams
m residue mass, expressed in grams
m mass of the 425 µm sieve, expressed in grams
m mass of 425 µm sieve and sample retained, expressed in grams
m mass passing through a 425 µm sieve, expressed in grams
m mass of the bottom receiver, expressed in grams
m mass of the bottom receiver and sample content, expressed in grams
m mass of sample passing through a 75 µm sieve, expressed in grams
2 © ISO 2008 – All rights reserved

ISO 13500:2008(E)
R hydrometer reading
R average hydrometer reading at lower temperature
R average hydrometer reading at higher temperature
R viscometer dial reading at 600 r/min
R viscometer dial reading at 300 r/min
S sample test value
s
t time, expressed in minutes
V total filtrate volume, expressed in millilitres
V filtrate volume, expressed in millilitres, collected between 7,5 min and 30 min
c
V initial volume, expressed in millilitres
V final volume, expressed in millilitres
V volume EDTA used, expressed in millilitres
V volume of filtrate used, expressed in millilitres
w mass fraction residue of particles greater than 75 µm, expressed in percent
w cumulative percent for point immediately greater than 6 µm
w cumulative percent for point immediately less than 6 µm
w cumulative percent less than 6 µm
w mass fraction residue of particles greater than 45 µm, expressed in percent (see 8.9.6)
w mass fraction moisture, expressed in percent
w cumulative percent finer
a
w soluble alkaline earth metals as calcium, expressed in milligrams per kilogram
AEM
w mass fraction of sample passing through a 75 µm sieve, expressed in percent
w mass fraction passing through a 425 µm sieve, expressed in percent
ρ sample density, expressed in grams per millilitre
θ temperature, expressed in degrees Celsius or degrees Fahrenheit
θ average temperature reading at lower temperature
θ average temperature reading at higher temperature
η apparent viscosity, expressed in centipoise
A
η viscosity of water, expressed in millipascal seconds
η 1,002, is the viscosity of water at 20 °C (68 °F)
η viscosity at desired temperature (see Table 3)
θ
η plastic viscosity, expressed in millipascal·seconds
P
η yield point, expressed in pounds per 100 ft
Y
ISO 13500:2008(E)
4 Requirements
4.1 Quality control instructions
All quality control work shall be controlled by manufacturer's documented instructions, which include
appropriate methodology and quantitative or qualitative acceptance criteria.
4.2 Use of test calibration materials in checking testing procedures
1)
4.2.1 Test calibration barite and test calibration bentonite can be obtained by contacting the API . The
calibration test materials are shipped in a 7,6 l (2 gal) plastic container.
4.2.2 The API office forwards the request to the designated custodian for further handling. The test
calibration products are furnished with a certificate of calibration giving the established values for each
property and the confidence limits within which a laboratory's results shall fall.
4.2.3 The custodian shall furnish a certificate of analysis for each sample.
4.2.4 For calibration requirements of API test calibration materials, refer to 5.2.11 and 5.3.10.
4.2.5 API standard evaluation base clay (formerly OCMA base clay; not OCMA grade bentonite): stocks of
API standard evaluation base clay have been set aside and can be ordered through the API.
4.3 Records retention
All records specified in this International Standard shall be maintained for a minimum of five years from the
date of preparation.
5 Calibration
5.1 Coverage
5.1.1 Clause 5 covers calibration procedures and calibration intervals for laboratory equipment and
reagents specified. For laboratory items not listed, the manufacturer shall develop procedures where deemed
appropriate.
5.1.2 The manufacturer shall control, calibrate, verify and maintain the laboratory equipment and reagents
used in this International Standard for measuring product conformance to International Standard requirements.
5.1.3 The manufacturer shall maintain and use laboratory equipment and reagents in a manner such that
measurement uncertainty is known and meets required measurement capability.
5.1.4 The manufacturer shall document and maintain calibration procedures, including details of laboratory
equipment and reagent type, identification number, frequency of checks, acceptance criteria and corrective
action that shall be taken when results are unsatisfactory.
5.1.5 The manufacturer shall establish and document responsibility for administration of the calibration
program, and responsibility for corrective action.
5.1.6 The manufacturer shall document and maintain calibration records for laboratory equipment and
reagents; shall periodically review these records for trends, sudden shifts or other signals of approaching
malfunction; and shall identify each item with a suitable indicator or approved identification record to show
calibration status.
1) American Petroleum Institute, 1220 L Street NW, Washington, D.C. 20005-4070, USA.
4 © ISO 2008 – All rights reserved

ISO 13500:2008(E)
5.2 Equipment requiring calibration
5.2.1 Volumetric glassware
Laboratory volumetric glassware used for final acceptance, including Le Chatelier flasks, pipettes, and
burettes, are usually calibrated by the supplier. Manufacturers of products to this International Standard shall
document evidence of glassware calibration prior to use. Supplier certification is acceptable. Calibration may
be checked gravimetrically. Periodic recalibration is not required.
5.2.2 Laboratory thermometers
5.2.2.1 The manufacturer shall calibrate all laboratory thermometers used in measuring product
conformance to standards against a secondary reference thermometer. The secondary reference
thermometer shall show evidence of calibration as performed against NIST-certified master instruments, in
accordance with the procedures specified by ASTM E77 and NIST (NBS) Monograph 150.
5.2.2.2 Calibration — Thermometers
5.2.2.2.1 Place the thermometer being calibrated side by side with a secondary reference thermometer into
a constant-temperature water bath (or suitable container of 4 l or more, filled with water, on a counter in a
constant-temperature room) and allow to equilibrate for at least 1 h.
5.2.2.2.2 Read both thermometers and record readings.
5.2.2.2.3 Repeat readings throughout at least a 1 h interval to obtain a minimum of four readings.
5.2.2.2.4 Calculate the average and the range of readings for each thermometer. The difference between
the range of readings for each thermometer shall not exceed ± 0,1 °C (± 0,2 °F), or the smallest scale division
on the thermometer being calibrated.
5.2.2.2.5 Calculate the average deviation of the thermometer reading from the secondary reference
thermometer reading. Calculate and document the correction for each thermometer.
5.2.3 Laboratory balances
5.2.3.1 The manufacturer shall calibrate the laboratory balances periodically in the range of use with
NIST class P, grade 3, or better weights.
5.2.3.2 The manufacturer shall service and adjust balances whenever calibration indicates a problem.
5.2.4 Sieves
Sieves shall be in accordance with ASTM E11 and ASTM E161 and have approximate dimensions of 76 mm
(3 in) in diameter and 69 mm (2,75 in) from top of frame to wire cloth.
5.2.5 Hydrometer
5.2.5.1 The manufacturer shall calibrate each hydrometer with the dispersant solution used in the
sedimentation procedure.
5.2.5.2 Calibration — Hydrometer
5.2.5.2.1 Calibrate each hydrometer using the same concentration dispersant solution as is used in the test,
at temperatures spanning the anticipated test temperatures, and by reading the top rather than the bottom of
the meniscus. Calibrate each hydrometer using the procedure in 5.2.5.2.2 to 5.2.5.2.9.
ISO 13500:2008(E)
5.2.5.2.2 Prepare 1 l of dispersant solution, as follows.
a) Place 125 ml ± 2 ml (127 g ± 2 g) of dispersant solution from test procedure (7.11.1 and 7.12.2) into a 1 l
volumetric flask.
b) Dilute to the 1 000 ml mark with deionized water. Mix thoroughly.
5.2.5.2.3 Place the dispersant solution in a sedimentation cylinder. Then place the cylinder in a constant-
temperature bath. Set bath temperature to the lowest expected temperature for any actual test. Allow to reach
equilibrium ± 0,2 °C (± 0,4 °F). Insert the hydrometer being calibrated and wait at least 5 min for the
hydrometer and solution to reach bath temperature.
5.2.5.2.4 Take a hydrometer reading at the top of the meniscus formed by the stem and take a
thermometer reading. Repeat readings at least 5 min apart so as to obtain a minimum of four readings each.
5.2.5.2.5 Calculate the average hydrometer reading and designate as R . Calculate the average
temperature reading and designate as θ .
5.2.5.2.6 Repeat 5.2.5.2.3 and 5.2.5.2.4, except set bath temperature to highest expected test temperature.
Calculate the average hydrometer and temperature readings and designate these readings as R and θ .
2 2
5.2.5.2.7 Calculate the hydrometer correction curve slope, M , as given in Equation (1):
c
R − R
( )
M = 1000 (1)
c
θ −θ
()
where
R is the average hydrometer reading at lower temperature;
R is the average hydrometer reading at higher temperature;
θ is the average temperature reading at lower temperature;
θ is the average temperature reading at higher temperature.
The temperature may be measured in either degrees Celsius or degrees Fahrenheit, so long as all
measurements and calculations are consistent in units (including subsequent use of the hydrometer in routine
test situations).
5.2.5.2.8 Calculate the hydrometer correction curve intercept, B , as given in Equation (2):
c
BM=×θ+⎡⎤R− 1× 1000 (2)
()()
cc 1 1
⎣⎦
where
M is the hydrometer correction curve slope;
c
θ is the average thermometer reading at the lower temperature;
R is the average hydrometer reading at the lower temperature.
5.2.5.2.9 Record M , B and the hydrometer serial number in a permanent calibration record and on the
c c
data sheet used in the calculations in 7.13 and 8.13.
For hydrometer calibration, example data sheet and calculation, see Clause C.1.
6 © ISO 2008 – All rights reserved

ISO 13500:2008(E)
5.2.6 Motor-driven, direct-indicating viscometer
5.2.6.1 The specifications for a direct-indicating viscometer are given in ISO 10414-1 and reproduced
here for reference:
a) rotor sleeve:
⎯ inside diameter: 36,83 mm (1,450 in),
⎯ total length: 87,0 mm (3,425 in),
⎯ scribed line: 58,4 mm (2,30 in) above the bottom of sleeve, with two rows of 3,18 mm
(0,125 in) holes spaced 120° (2,09 rad) apart, around rotor sleeve just below
scribed line;
b) bob, closed, with flat base and tapered top:
⎯ diameter: 34,49 mm (1,358 in),
⎯ cylinder length: 38,0 mm (1,496 in);
c) torsion-spring constant:
⎯ 386 dyne-cm/degree deflection;
d) rotor sleeve speeds:
⎯ high speed: 600 r/min,
⎯ low speed: 300 r/min.
NOTE Other rotor speeds are available in viscometers from various manufacturers.
5.2.6.2 The manufacturer shall calibrate each meter with 20 mPa·s and 50 mPa·s, certified standard
silicone fluids.
5.2.6.3 Apparatus and materials.
5.2.6.3.1 Standard thermometer, with an accuracy of ± 0,1 °C (± 0,2 °F), e.g. ASTM 90c or 91c grade.
5.2.6.3.2 Certified calibration fluid, of viscosity 20 mPa·s, with chart (viscosity vs. temperature).
5.2.6.3.3 Certified calibration fluid, of viscosity 50 mPa·s, with chart (viscosity vs. temperature).
5.2.6.3.4 Magnifying glass, approximately ×3 magnification.
5.2.6.4 Procedure.
5.2.6.4.1 Allow the viscometer and the calibration fluids to stand on counter-top a minimum of 2 h to
approach temperature equilibrium.
5.2.6.4.2 Operate viscometer without fluid a minimum of 2 min to loosen bearing and gears.
5.2.6.4.3 Clean and dry viscometer cup. Fill the viscometer cup to scribed line with 20 mPa·s calibration
fluid and place on meter stage. Raise stage until fluid level reaches the inscribed line on rotor sleeve.
5.2.6.4.4 Place thermometer into the fluid and hold or tape to the side of viscometer to prevent breakage.
5.2.6.4.5 Operate viscometer at 100 r/min setting until thermometer reading is stable to within ± 0,1 °C
(± 0,2 °F). Record the temperature reading.
ISO 13500:2008(E)
5.2.6.4.6 Using magnifying glass, take dial readings at 300 r/min and 600 r/min settings. Estimate readings
to nearest 0,5 dial unit and record.
5.2.6.4.7 Compare 300 r/min dial reading to certified viscosity at test temperature from fluid calibration
chart. Record readings and deviation from certified calibration fluid viscosity as furnished by supplier. Divide
600 r/min reading by 1,98 to obtain viscosity value at 600 r/min. Compare this value to the certified fluid.
5.2.6.4.8 Repeat 5.2.6.4.1 through 5.2.6.4.7 using the 50 mPa·s fluid.
5.2.6.4.9 Compare the deviations to the values in Table 1. Tolerances shall not exceed values in Table 1.
Table 1 — Dial reading tolerances with various calibration fluids,
F-1 spring (or equivalent) in motor-driven, viscometer
Acceptable tolerance
Calibration fluid
300 r/min 600 r/min/1,98
20 mPa·s ± 1,5 ± 1,5
50 mPa·s ± 1,5 ± 1,5
5.2.7 Laboratory pressure-measuring device
5.2.7.1 The manufacturer shall document evidence of the laboratory pressure-measuring device
calibration prior to use.
5.2.7.2 Calibration — Laboratory pressure-measuring device
5.2.7.2.1 Regarding type and accuracy, the pressure-measuring devices shall be readable to at least 2,5 %
of full-scale range.
5.2.7.2.2 Pressure-measuring devices shall be calibrated to maintain ± 2,5 % accuracy of full-scale range.
5.2.7.2.3 Regarding usable range, the pressure measurements shall be made at not less than 25 % nor
more than 75 % of the full-pressure span of pressure gauges.
5.2.7.2.4 Pressure-measuring devices shall be calibrated annually with a master pressure-measuring
device or a dead-weight tester at at least three equidistant points of full scale (excluding zero and full scale as
required points of calibration).
5.2.8 Mixer
2)
EXAMPLE Multimixer® Model 9B with 9B29X impeller blades, or equivalent, mounted flash side up.
The manufacturer shall verify that all spindles rotate at 11 500 r/min ± 300 r/min under no load with one
spindle operating. Each spindle is fitted with a single sine-wave impeller approximately 25 mm (1 in) in
diameter mounted flash side up. New impellers shall be weighed prior to installation, with mass and date
recorded.
2) Multimixer® Model 9B is an example of a suitable product available commercially. This information is given for the
convenience of users of this International Standard and does not constitute an endorsement by ISO of this product.
8 © ISO 2008 – All rights reserved

ISO 13500:2008(E)
5.2.9 Chemicals and solutions
5.2.9.1 These shall meet ACS or international equivalent reagent grade, if available.
5.2.9.2 Calibration — EDTA solution
5.2.9.2.1 Reagent
5.2.9.2.1.1 Standard calcium chloride solution, c(CaCl ) = (0,010 0 ± 0,000 1) mol/l.
5.2.9.2.2 Procedure
a) To a suitable flask, add 50 ml ± 0,05 ml of deionized water and 50 ml ± 0,05 ml of standard CaCl solution.
b) Proceed as in 7.6.1 through 7.6.5, but without adding barite or additional water. (Use the 100 ml solution
prepared above in place of the 100 ml deionized water specified in 7.6.1.)
c) Calculate the calibration correction, C , as given in Equation (3):
c
CC=− 200 (3)
cm
where C is 40 times the EDTA volume, expressed in millilitres.
m
NOTE The calibration correction, as determined by this procedure, results in a number that is subtracted from the
sample test value, S .
s
EXAMPLE 1 Calibration correction determination:
EDTA volume for the CaCl solution is equal to 4,8 ml:
C = 40 × 4,8 = 192
m
C = 192 − 200
c
C = − 8
c
EXAMPLE 2 Calibration correction:
EDTA for the sample is equal to 6,1 ml:
Test value for the sample, S = 244 mg/kg
s
Corrected test value, S = S − C = 244 − (− 8) = 252 mg/kg.
c s c
5.2.10 Deionized (or distilled) water
The manufacturer shall develop, document and implement a method to determine hardness of water. The
water shall not be used if hardness is indicated.
5.2.11 API test calibration materials
The manufacturer shall perform in-house verification of API calibration barite and/or (where applicable) API
test calibration bentonite for properties listed with their certificates of analysis, as required by this International
Standard.
5.3 Calibration intervals
5.3.1 General
Any instrument subjected to movement that can affect its calibration shall be recalibrated prior to use.
ISO 13500:2008(E)
5.3.2 Thermometers
Calibrate each thermometer before its first use by the manufacturer. After calibration, mark each thermometer
with an identifying number that ties it to its corresponding correction chart. Check the calibration annually
against the secondary reference thermometer.
5.3.3 Laboratory balances
Calibrate each balance prior to its first use by the manufacturer. Check calibration at least once per month for
six months, then at least once per six months if required measurement capability is being maintained. If not,
service and recalibrate, then check at least once per month until the required measurement capability is
maintained for six months, then once per six months.
5.3.4 Sieves
No calibration of sieves is required. See 5.2.11 for periodic measurement requirements using standard
reference materials.
5.3.5 Hydrometer
Calibrate each hydrometer prior to its first use by the manufacturer. After calibration, note and record each
hydrometer identifying number that ties it to its correction chart. Periodic recalibration is not required.
5.3.6 Motor-driven, direct-indicating viscometers
Calibrate each viscometer prior to its first use by the manufacturer. Check the calibration at least once per
week for three months, then at least once per month if required measurement capability is being maintained.
5.3.7 Mixer
EXAMPLE Multimixer® Model 9B with 9B29X impeller blades, or equivalent, mounted flash side up.
Check and record the mixer spindle speed at least once every 90 days to ensure that the operation falls within
the prescribed range, using a phototachometer or similar device. Remove, clean, dry and weigh each impeller
blade in use at least once every 90 days. Record masses and replace blades when the mass drops below
90 % of its original value.
5.3.8 Deionized (or distilled) water
The manufacturer shall determine the hardness of the water whenever a new batch of water is prepared or
purchased, or whenever the deionizing cartridges are replaced.
5.3.9 Laboratory pressure-measuring devices
Manufacturer shall document evidence of laboratory pressure-measuring device calibration prior to its being
placed into first use by the manufacturer, then annually thereafter.
5.3.10 API test calibration materials
The manufacturer shall test the applicable API test calibration material(s) at least once per 40 tests. Sieve
calibration requirements have been removed.
10 © ISO 2008 – All rights reserved

ISO 13500:2008(E)
6 Packaged material
6.1 Description
6.1.1 Packaging of palletized goods should safeguard the means of safe handling, transport, storage and
identification, and minimize damage and spillage. Packed material should be inside the dimensions of the
pallet although some overhang is allowed.
6.1.2 This procedure applies to products covered by this International Standard. The main intention is to
improve the possibility of recycling of all packaging materials for components used in drilling fluids, completion
fluids and oil well cements, including dry, powdered or granular materials not covered under this International
Standard.
6.2 Apparatus — Pallets
6.2.1 The preferred pallet design and construction should be in accordance with ISO 6780.
6.2.2 Preferred sizes for wooden pallets include the following:
a) 1 200 mm × 1 000 mm (47 in × 39 in) CP6;
b) 1 140 mm × 1 140 mm (45 in × 45 in) CP8/CP9/CP3;
c) 1 219 mm × 1 219 mm (48 in × 48 in);
d) 1 118 mm × 1 321 mm (44 in × 52 in);
e) 1 067 mm × 1 321 mm (42 in × 52 in), equivalent to CP4/CP7;
f) 1 016 mm × 1 219 mm (40 in × 48 in).
NOTE CP is the size as defined in ISO 6780.
6.2.3 Other pallet sizes and details concerning design and construction should be agreed upon by the
manufacturer and the customer.
6.2.4 The maximum outside dimensions of the total package shall be in accordance with the applicable
pallet size plus a maximum overhang of 3 cm (1,2 in). The overall height shall not exceed 2,0 m (80 in).
6.2.5 The maximum net mass should not exceed 2 000 kg (4 409 lb).
6.3 Apparatus — Bags
6.3.1 The manufacturer filling the bag should take reasonable steps to ensure that the bag construction is
capable of safe handling, transport and storage.
6.3.2 The manufacturer should take reasonable steps to select bags that minimize waste and provide the
possibility for recycling of the packaging material.
6.3.3 The manufacturer should consider the humidity-barrier capabilities of the bags relative to the needs of
the particular product when selecting bags.
ISO 13500:2008(E)
6.4 Marking — Pallets
Markings should include the following, where applicable and as specified by individual contracts:
a) product name;
b) gross/net mass, in kilograms (pounds);
c) other information as required, such as manufacturer's name, gross allowable mass, disposal options.
6.5 Marking — Bags
Markings shall include the following, where applicable and as specified by individual contracts:
a) name of the material in print script at least 13 mm (0,5 in) high;
b) mass, which shall be denominated in kilograms, of the material in letters, or numbers and letters, at least
6 mm (0,25 in) high;
c) lot/batch number in print script and/or numbers at least 3 mm (0,125 in) high, traceable to manufacturer’s
country of origin;
d) identification as recyclable;
e) safety information.
6.6 Pallet covers
6.6.1 Each pallet may have a cover made of at least one of the following:
a) polyethylene (PE) shrink or wrapped film;
b) PE bonnet type;
c) polypropylene (PP) bonnet type.
6.6.2 All plastics should be UV-stabilized, unless otherwise requested. Cardboard, carton or wood covers
may be used in place of the above. If appropriate, a bottom layer of cardboard, PE sheet or plywood may be
connected to the cover to unitize the overall package.
6.7 Package mass
Each sack shall contain a specified net mass ± 5 %. The average weight of 5 % of all sacks in a shipment,
taken at random, shall not be less than the specified weight.
6.8 Storage
The manufacturer shall advise on storage upon request.
6.9 Recycling
6.9.1 General
If appropriate, recycling of the remaining materials after using the contents may be done in accordance with
the guidelines given in 6.9.2 to 6.9.4. All recycling should be done in accordance with local instructions and in
compliance with the local regulatory administration concerned.
12 © ISO 2008 – All rights reserved

ISO 13500:2008(E)
6.9.2 Pallets
General recovery and recycling, provided that pallet description is in accordance with ISO 6780.
6.9.3 Cover
Identify PE, PP or carton, and recycle accordingly.
6.9.4 Bags
Use of quality, high-performance paper results in less packaging materials and less waste for recycling. After
separation of the various components, recycle accordingly.
NOTE When handling chemicals, reduction in the volume of packaging materials can be obtained by application of
containers in a dedicated container scheme.
7 Barite
7.1 Principle
7.1.1 Drilling-grade barite is produced from commercial barium sulfate-containing ores. The manufacturer
shall retain certificates of analysis or similar documentation on these commercial barium sulfate ores. It may
be produced from a single ore or a blend of ores and may be a straight-mined product or processed by
beneficiation methods, i.e. washing, tabling, jigging or flotation. It may contain accessory minerals in addition
to the barium sulfate (BaSO ) mineral. Because of mineral impurities, commercial barite can vary in colour
from off-white to grey to red or brown. Common accessory minerals are silicates, such as quartz and chert,
carbonate compounds such as siderite and dolomite, and metallic oxide and sulfide compounds. Although
these minerals are normally insoluble, they can, under certain conditions, react with other components in
some types of drilling fluids and cause adverse changes in the drilling fluid properties. (See Annex A for more
details.)
7.1.2 Drilling-grade barite shall be deemed to meet the requirements of this International Standard if a
composite sample representing no more than one day's production conforms to the chemical and physical
specifications of Table 2, represents the product produced and is controlled by the manufacturer.
Table 2 — Barite physical and chemical requirements
Requirement Standard
Density 4,20 g/ml, minimum
Water-soluble alkaline earth metals, as calcium 250 mg/kg, maximum
Residue gr
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