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NORSOK STANDARD

COMMON REQUIREMENTS

DRILL STRING COMPONENTS

M-CR-702 Rev. 1, January 1996

Please note that whilst every effort has been made to ensure the accuracy of the NORSOK standards neither OLF nor TBL or any of their members will assume liability for any use thereof.

Drill string components

M-CR-702 Rev.1, January 1996

CONTENTS 1 FOREWORD 2 SCOPE 3 NORMATIVE REFERENCES 4 DEFINITIONS 5 TECHNICAL DESCRIPTION 5.1 General 5.2 Coating requirements 5.3 Hardfacing 5.4 Material requirements 5.5 Testing requirements 5.6 Marking requirements 6 DRILL STRING COMPONENTS 6.1 General 6.2 Drill pipe w/tool joints 6.3 Heavy-weight drill pipe 6.4 Drill collars 6.5 Crossover subs (drill-stem subs) and stabilisers 6.6 Welded blade stabilisers ANNEX A TECHNICAL DATA SHEETS (NORMATIVE) ANNEX B MARKING OF EQUIPMENT (INFORMATIVE) 2 2 2 3 3 3 3 3 3 4 5 5 5 5 6 7 7 7 8 13

NORSOK standard

Page 1 of 13

Drill string components

M-CR-702 Rev.1, January 1996

1

FOREWORD

NORSOK (The competitive standing of the Norwegian offshore sector) is the industry initiative to add value, reduce cost and lead time and remove unnecessary activities in offshore field developments and operations. The NORSOK standards are developed by the Norwegian petroleum industry as a part of the NORSOK initiative and are jointly issued by OLF (The Norwegian Oil Industry Association) and TBL (The Federation of Norwegian Engineering Industries). NORSOK standards are administered by NTS (Norwegian Technology Standards Institution). The purpose of this industry standard is to replace the individual oil company specifications for use in existing and future petroleum industry developments, subject to the individual company's review and application. The NORSOK standards make extensive references to international standards. Where relevant, the contents of this standard will be used to provide input to the international standardization process. Subject to implementation into international standards, this NORSOK standard will be withdrawn. Annex A is normative. Annex B is informative.

2

SCOPE

This standard describes the requirements for design, production and testing of drill pipe with tool joints, heavy weight drill pipes, drill collars, stabilisers and crossover subs. Other parts of the drill string should have comparable level of safety with respect to strength, fatigue and corrosion resistance.

3

NORMATIVE REFERENCES

Steel pipes for use as drill pipe. Specification. (Replaces API 5D). Recommended practice for drill stem design and operating limits. (Will be replaced by ISO 10407, Drilling and production equipment - Drill stem design and operating limits, tentatively to be issued as Draft International Standard (DIS) October 1997.) Specification for rotary drilling equipment. (Will be replaced by ISO 10424, Drilling and production equipment - Specification for rotary drilling equipment, tentatively to be issued as DIS March 1997). Standard guide for magnetic particle examination. Standard practice for ultrasonic inspection of metal pipe and tubing. Approval testing of welders. Specification and qualification of welding procedures for metallic materials. Metallic products - Types of inspection documents.

ISO/DIS 11961 API RP 7G

API Spec. 7 ASTM E709 ASTM E213 EN 287 EN 288 EN 10204

NORSOK standard

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Drill string components

M-CR-702 Rev.1, January 1996

4

DEFINITIONS AND ABBREVIATIONS

Shall mean normative in the application of NORSOK standards. Shall mean informative in the application of NORSOK standards. Shall is an absolute requirement which shall be followed strictly in order to conform with the standard. Should is a recommendation. Alternative solutions having the same functionality and quality are acceptable. May indicates a course of action that is permissible within the limits of the standard (a permission). Can-requirements are conditional and indicates a possibility open to the user of the standard. American Petroleum Institute Draft International Standard International Organisation for Standardisation

4.1 Definitions Normative references Informative references Shall Should May Can 4.2 API DIS ISO Abbreviations

5

TECHNICAL DESCRIPTION

5.1 General The requirements given in the standards ISO/DIS 11961, API RP 7 G and API Spec. 7 apply. Additional requirements to those specified in the referred standards are given below. Further requirements shall be specified in the technical data sheets in annex A. 5.2 Coating requirements Internal coating: It is the Vendor's responsibility to recommend a suitable coating, unless this is specified in the data sheet. The Vendor should provide a coating specification. 5.3 Hardfacing If not specified in the data sheet, hardfacing is not required. If hardfacing is specified, the Vendor should provide a specification for the hardfacing. 5.4 Material requirements All materials used for the manufacture of drill string components shall be covered by a recognised standard or a written material specification, giving requirements for chemical composition, material properties, melting and manufacturing practice and testing requirements. The following requirements shall apply to the low-alloy family of high strength steel for drilling equipment. The steel shall be fully killed and manufactured according to a fine-grain inclusion control practice. The steel shall be free from micro and macro segregations which are considered detrimental to the application of the material. Chemical composition requirements: NORSOK standard Page 3 of 13

Drill string components % Carbon % Phosphorus % Sulphur % Nitrogen (C) (P) (S) (N) 0.4 0.015 0.010 0.009 max max 1) max 1) max 3)

M-CR-702 Rev.1, January 1996

If the following elements are intentionally added, the given maximum limits apply: % Boron (B) 0.005 max % Aluminium total (Al) 0.08 max % Vanadium (V) 0.08 max 2) % Niobium (Columbium) (Nb) 0.05 max 2) Notes: 1. P may be increased to max 0.018%, provided S < 0.005%. 2. V + Nb < 0.08%. 3. The content of N may be increased to max. 0.012% provided the ratio Al/N > 2 is satisfied. The components shall be supplied in the quenched and tempered condition. The material certificate shall be as required by EN 10204, type 3.1B or equivalent and shall give the chemical composition, including both the intentionally added and trace elements (N, P, S), the mechanical properties, and the heat treatment condition of the supplied material. 5.5 Testing requirements Mechanical testing shall be carried out for each heat, and each heat treatment batch. Test specimens shall be cut from an integrated prolongation of the item, but may be taken from separate test blocks provided they are connected to the item during the complete heat treatment operation, they are of dimensions comparable with the items in question and have undergone the same hot forming process. Sampling and mechanical testing shall be carried out after the final heat treatment. Test specimen shall be taken from the part of material which is the mid-section of the component at the time of heat treatment. Requirements: · Charpy V-notch impact toughness for drill string componentes shall be documented to satisfy the requirements of table 5.1. (Testing at both temperatures is required.) · Elongation shall be 50% higher than required by ISO/DIS 11961. · Reduction of area min. 45%. · Yield/tensile ratio max 0.92. · Actual yield strength shall not exceed 1050MPa for all components apart from drill pipe body for material with chemistry according to 5.4.

NORSOK standard

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Drill string components

M-CR-702 Rev.1, January 1996

Table 5.1 Impact energy requirements Test temperature o C Room temperature -20 Specimen size mm x mm 10 x 10 10 x 7.5 10 x 5 10 x 10 10 x 7.5 10 x 5 Min. average energy of each set of 3 specimens J 70 56 47 41 33 27 Min. energy of any specimen of a set J 60 49 40 30 24 20

5.6 Marking requirements The equipment shall be marked in accordance with API RP 7G and shall be identifiable after the components have been used. For illustration an example is given in annex B.

6

DRILL STRING COMPONENTS

6.1 General Drill string components shall be delivered in accordance with API 7 and ISO/DIS 11961 and the additional requirements in this standard. 6.2 Drill pipe w/tool joints

6.2.1 General The data in accordance with ISO/DIS 11961 SR 15.1 and 15.2 shall be provided for drill pipe body and tool joints. Inspections in accordance with ISO/DIS 11961 appendix B - SR2 and appendix C shall be performed for drill pipe body. The threads shall be treated against gaulling and "broken in". 6.2.2 Welding of drillstring components The welding of drillpipe and tool joint shall be done by friction welding in accordance with a qualified welding procedure. Transverse weld tensile test shall as acceptance criterion have tensile strength at least equal to minimum specified tensile strength for pipe material based on cross section of weld area versus cross section of pipe. Testing shall include hardness testing with the HRC (Rockwell C) method through the cross section. The maximum hardness shall be 39 HRC.

NORSOK standard

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Drill string components

M-CR-702 Rev.1, January 1996

Number of tensile tests and hardness test samples shall be minimum 2 for each delivery or minimum once per 200 pipes, whichever is more. Both ends of the pipe shall be tested. The testing should include the first pipe to be manufactured for each delivery. Notch impact test (Charpy - V) shall as acceptance criteria have min. average 25J and min. single 20J at minus 20oC. Frequency of testing shall be the same as for the drill pipe. Sampling for transverse tensile testing and Charpy V-notch testing is shown in fig. 1 and 2. All welds shall be 100% inspected with MPI and ultrasonic testing. Testing should be carried out in accordance with ISO/DIS 11961, section 8.6, fig. 9. Calibration should be based on a 1.6 mm diameter hole.

Weld line R min. 25 mm

25 mm

60 mm

T

G rip ends may be cold f lattened if grips to suit the curvature are not available

T= min. wall thickness over t he reduced section

Fig. 1

Dimensions of transverse weld tensile test specimen

Weld line

2 mm or as close to surface as possible keeping full size specimens (10 x 10 mm)

Fig. 2

Location and orientation of Charpy V-notch test specimens.

6.3 Heavy-weight drill pipe The specifications for heavy-weight drill pipe (HWDP) shall be as prescribed for drill pipe w/tool joints in 6.2 with the following amendments: NORSOK standard Page 6 of 13

2 mm

Drill string components

M-CR-702 Rev.1, January 1996

The pin and box shall have stress relief features in accordance with API Spec. 7. The threads shall be given an anti-gaulling treatment. The stress relief shall conform to the boreback design. The surfaces as well as the roots of the threads shall be cold worked and marked according to API Spec. 7, Section 6.5, note 1. The thread roots of pin and box plus the surface of the pin stress relief groove (SRG) shall be cold worked. The pin and box threads shall be cold worked in accordance with the API Spec 7, Sec. 6.5, note 1. 6.4 Drill collars

6.4.1 General The requirements for heavy weight drill pipe apply. 6.4.2 Nonmagnetic drill collars If not specified otherwise, stainless steel according to API Spec 7, table 6.9 shall be used. Connections shall be given an anti-gaulling treatment 6.5 Crossover subs (drill-stem subs) and stabilisers Crossover subs as specified in section 6.4, Drill collars. 6.6 Welded blade stabilisers Any fabrication welding shall be qualified in accordance with EN 288-3 or equivalent. The welders/welding operators shall be certified according to EN 287 or equivalent specification. All welds shall be 100% MPI inspected in accordance with 6.2.2.

NORSOK standard

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Drill string components Annex A

M-CR-702 Rev.1, January 1996

ANNEX A

· · · ·

TECHNICAL DATA SHEETS (NORMATIVE)

Drill pipe w/tool joints Heavy wall drill pipe Drill collar Rotary sub/ X-over sub

NOTE: When filling in the data sheets, Vendor shall note the Premium Class values (operating criteria) behind the 1. Class values.

NORSOK standard

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Drill string components Annex A

M-CR-702 Rev.1, January 1996

1. Class DRILL PIPE W/TOOL JOINTS Number of joints Range Pipe body OD of the pipe body ID of the pipe body Wall thickness, nominal/minimum Type of upset Nominal weight Grade Drift diameter/area to be drifted Collapse resistance, minimum Internal yield pressure, minimum Tensile yield, minimum Torsional yield, minimum Adjusted weight Tool-joint OD of tool-joint ID of tool-joint, pin/box Tong space length, pin Tong space length, box Type of elevator shoulder, pin Type of elevator shoulder, box Bevel diameter Connection type Tensile yield, minimum Torsional yield, minimum Make up torque Hardfacing of tool-joint box/pin Internal protection External rust protection Type of thread compound Type of thread protector Effective length of drillpipe from shoulder to shoulder, tool-joint : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : :

Premium Class

NORSOK standard

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Drill string components Annex A

M-CR-702 Rev.1, January 1996

1. Class HEAVY WALL DRILL PIPE Type - with or without weld Type - spiral or conventional Number of joints Range OD of the pipe body ID of the pipe body Nominal weight Grade Drift diameter Tensile yield, minimum Torsional yield, minimum Internal yield pressure, minimum Collapse resistance, minimum Hardfacing of tool joint, type/length ID of tool joint OD of tool joint Bevel diameter Length of tong space P/B Type of elevator shoulder, P/B Thread type Connection type Stress-relief groove, pin - type Bore back, box - type Bending strength ratio Anti galling treatment, type Tensile yield, minimum Torsional yield, minimum Make up torque Hardfacing of centre upset and OD OD of centre upset Length of centre upset External rust protection Internal plastic coating Closed end displacement Open end displacement Capacity Adjusted weight Length of HWDP from sealing shoulder to sealing shoulder, tool joint NORSOK standard : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : :

Premium Class

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Drill string components Annex A

M-CR-702 Rev.1, January 1996

1. Class DRILL COLLAR Number of joints OD of the collar ID of the collar API Drift diameter Spiral grooving Spiral direction Nominal weight Yield strength, minimum Tensile strength, minimum Tong space box Tong space pin OD pin end OD box end Elevator recess Slip recess Hardbanding box end Hardbanding pin end Bevel diameter Thread type Connection type Stress-relief, groove, pin Bore back, box Bending strength ratio Nominal make up torque External rust protection Type thread compound Thread protection Closed end displacement Open end displacement Effective length of drillcollar, sealing shoulder to sealing shoulder : : : : : : Right hand : : : : : : : : : : : : : : : : : : : : : : : :

Premium Class

NORSOK standard

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Drill string components Annex A

M-CR-702 Rev.1, January 1996

1. Class ROTARY SUB / X-OVER SUB Type rotary sub OD of sub OD of reduced section ID of sub Drift diameter Length of sub, sealing shoulder to sealing shoulder Tong space of large OD Tong space of reduced OD Tensile yield, minimum Torsional yield, minimum Weight Upper connection type, pin/box Lower connection type, box/pin Stress relief groove, pin/pin Bore back, box/box Bevel diameter, pin/box Bending strength ratio, p/b Bending strength ratio, b/p Make up torque, p/b Make up torque, b/p External rust protection Type thread compound Thread protection Float bore, size and type : : : : : : : : : : : : : : : : : : : : : : : :

Premium Class

NORSOK standard

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Drill string components Annex B

M-CR-702 Rev.1, December 1995

ANNEX B

MARKING OF EQUIPMENT (INFORMATIVE)

1. Cut the slot int o the tooljoint.

2. Die stamp the marking on the bottom of the slot (secures marking when plate has been lost ) and on the brass plate.

"Pipe No."

3. Insert a brass plate int o the slot and squeeze t he border using a proper tool. Hard-stamp pipe no. identification into brass plate.

24.95 DIA (Brass plate, top view) 24.95 DIA

2. 8

2.5

1

(Brass plate, side view)

4. Edge the border of t he slot (4 times on circumfrence) to prevent loss of plate.

NORSOK standard

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7.0

25.0 DIA

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