1、BS EN ISO10426-6:2008ICS 75.020; 91.100.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPetroleum and naturalgas industries Cements and materialsfor well cementingPart 6: Methods for determiningthe static gel strength of cementformulations (ISO 10426-6:2008)Th
2、is British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 July 2008 BSI 2008ISBN 978 0 580 56037 8Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 10426-6:2008National forewordThis British Standard is the UK implementation of EN ISO104
3、26-6:2008.The UK participation in its preparation was entrusted to TechnicalCommittee PSE/17/-/3, Drilling and completion fluids and well cements.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the nece
4、ssary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 10426-6July 2008ICS 91.100.10; 75.020English VersionPetroleum and natural gas industr
5、ies - Cements and materialsfor well cementing - Part 6: Methods for determining the staticgel strength of cement formulations (ISO 10426-6:2008)Industries du ptrole et du gas naturel - Ciments etmatriaux pour la cimentation des puits - Partie 6:Mthodes de dtermination de la force statique du gel des
6、formulations de ciment (ISO 10426-6:2008)Erdl- und Erdgasindustrie - Zemente und Materialien frdie Zementation von Tiefbohrungen - Teil 6: Verfahren zurBestimmung der statischen Gelfestigkeit vonZementzusammensetzungen (ISO 10426-6:2008)This European Standard was approved by CEN on 21 June 2008.CEN
7、members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on applica
8、tion 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has t
9、he same status as theofficial 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
10、,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reserv
11、edworldwide for CEN national Members.Ref. No. EN ISO 10426-6:2008: EBS EN ISO 10426-6:2008EN ISO 10426-6:2008 (E) 3 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“
12、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 id
13、entical 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 he
14、ld 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, Finlan
15、d, 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
16、ISO 10426-6:2008 without any modification. BS EN ISO 10426-6:2008ISO 10426-6:2008(E) ISO 2008 All rights reserved iiiContents 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 stren
17、gth 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 information8 Bibliography 9 BS EN ISO 10426-6:2008ISO 10426-6:2008(E) iv
18、ISO 2008 All rights reservedForeword 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 intereste
19、d 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 Com
20、mission (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 techni
21、cal 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 sh
22、all 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 ceme
23、nts. 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
24、 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 BS EN ISO 10426-6:2008ISO 10426-6:2008(E) ISO 2008 All rights reserved vIntrodu
25、ction 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
26、 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,
27、 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 th
28、at, 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 testin
29、g 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
30、 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 re
31、fers 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 resu
32、lts. 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 f
33、or information only. BS EN ISO 10426-6:2008BS EN ISO 10426-6:2008INTERNATIONAL STANDARD ISO 10426-6:2008(E) ISO 2008 All rights reserved 1Petroleum and natural gas industries Cements and materials for well cementing Part 6: Methods for determining the static gel strength of cement formulations 1 Sco
34、pe 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 t
35、his 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 cement
36、s 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 tem
37、perature 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 strength of 250 Pa (500 lbf/100 ft2) BS EN ISO 10426-
38、6:2008ISO 10426-6:2008(E) 2 ISO 2008 All rights reserved3.4 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
39、 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 thro
40、ugh 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
41、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 c
42、ement 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 measuri
43、ng 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 sa
44、mpling 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 fi
45、eld 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
46、be verified by methods found in ISO 10426-2:2003, Clause 6. BS EN ISO 10426-6:2008ISO 10426-6:2008(E) ISO 2008 All rights reserved 36 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
47、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 pl
48、acement 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 manufacturers instructions. During the test period, the temperature and pressure of the slurry in the test cell is increased in ac
49、cordance 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 ran
