美国石油协会API7-1(2)

4 ADDENDUM 3 TO ANSI/API SPECIFICATION 7-1/ISO 10424-1

Valves furnished by the valve manufacturer with no preferred connections shall be marked with the following information.

a) the manufacturer’s name or mark;

b) “ISO 10424-1” and/or Spec 7-1 as applicable; c) the letters “NPC” “NPC” (mark twice); d) class of service; e) unique serial number;

f) date of manufacture (month/year);

g) the maximum working pressure, to be applied in milled recess;

h) the connection size and style, applied on the OD surface adjacent to the connection;

i) an indication of the rotational direction required to position valve in the closed position applied on the

OD surface adjacent to each valve-operating mechanism; j) On class 1 type valves, an indication of normal mud flow direction marked with an arrow (→) and the

word “flow”.

Revise current Clause 8.3 Non-magnetic drill collars per the following changes and additions 8.3.2.1 Tensile requirements Paragraph 4, Second sentence change: 100 mm (4 in.) to

65 mm (2.6 in.)

Add note after paragraph 4

NOTE The mid-wall radius is located a distance below the outside surface equal to the OD divided by 4.

Change current Clause 8.3.3 to be clause 8.3.4

Add new Sub - Clauses 8.3.3, 8.3.3.1, 8.3.3.2, 8.3.3.3, 8.3.3.4 as follows: 8.3.3 Impact strength requirements 8.3.3.1 General

Charpy V-notch impact tests shall be conducted on specimens conforming to the requirements of ISO 148 or ASTM A 370 and ASTM E 23 and shall be conducted at a temperature less than or equal to 24o C (75o F).

SPECIFICATION FOR ROTARY DRILL STEM ELEMENTS 5

8.3.3.2 Specimens

A minimum of one specimen per bar shall be tested, with a minimum of three specimens from each heat. Specimens shall be taken at 25,4 mm (1 in.) below the outside surface or at mid-wall, whichever is closer to the outside surface. The specimen shall be longitudinally oriented and radially notched. (See 8.3.2.1 for definition of mid-wall.) 8.3.3.3 Specimen size

Full size (10 mm × 10 mm) shall be used unless the expected impact energy exceed the calibrated rating of the machine. In this case, sub-size specimens down to half size (10 mm × 5 mm) may be used. The absorbed energy requirement is not changed. 8.3.3.4 Acceptance criteria

The acceptance criteria are listed below. Non-ferrous materials are considered to be those containing less than 50 % iron. For steels, the minimum required impact energy depends on the reported yield strength of the bar being tested.

If the temperature of impact testing is greater than –25o C (–13o F), the average impact strength of all specimens from a heat shall be 120 J (90 ft-lbs) or greater, with no single value less than 100 J (75 ft-lbs). If the temperature of impact testing is less than or equal to –25o C (–13o F), the average impact strength of all specimens from a heat shall be 40 J (30 ft-lbs) or greater, with no single value less than 33 J (25 ft-lbs). Add new Table 31

Table 31 — Impact energy of non-magnetic steels

Material type Non-magnetic steel Non-magnetic steel Non-magnetic steel Non-ferrous alloys

Yield strength range 690 to 970 MPa 970 to 1100 MPa > 1100 MPa > 690 MPa

Minimum impact energy

81 J 68 J 54 J 39 J

Clause 8.3.4.1 (was old sub-clause 8.3.3.1), Paragraph 1, Sentence 4, change definition of one lot to read: One lot is defined as all material from the same heat processed at one time. Clause 8.3.4.2 (was old sub-clause 8.3.3.2), Paragraph 1, Sentence 3, delete words: strip chart

Re-number current Sub-clause 8.3.4 to be 8.3.5, 8.3.5.1 and 8.3.5.2 and add/revise text as follows: 8.3.5 Corrosion resistance requirements (for austenitic steel collars of 12 % chromium or more)

Austenitic stainless steel collars are subject to cracking due to the joint action of tensile stress and certain specific corrosive agents. This phenomenon is called stress-corrosion cracking.

6 ADDENDUM 3 TO ANSI/API SPECIFICATION 7-1/ISO 10424-1

Add new sub clause 8.3.5.1 and add or revise text as follows: 8.3.5.1 Intergranular corrosion

Resistance to intergranular corrosion shall be demonstrated by subjecting material from each collar to the corrosion test specified in ASTM A 262 Practice E. At the discretion of each supplier, the test specimen may have an axial orientation, in which case it shall be taken from a point at least 25,4 mm (1.0 in.) from the outside surface. Or it may have a tangential orientation, in which case its midpoint shall be at least 25,4 mm (1.0 in.) from the outside surface.

NOTE The midpoint is located a distance below the outside surface equal to the OD/4.

The screening test specified in ASTM A 262, Practice A shall not be waived. The result of the test shall be reported for information.

NOTE The localized corrosion detected by ASTM A 262, Practice A is not an accurate prediction of stress-corrosion cracking, but may be indicative of reduced resistance to severe corrosive environments.

Add new sub clause 8.3.5.2 and add or revise text as follows: 8.3.5.2 Compressive treatment

Under some environmental circumstances, steels may be subject to transgranular stress-corrosion cracking, especially in regions where the manufacturing process creates tensile residual stress. Drill collars made of austenitic steel bars containing 12 % to 30% chromium shall be treated on the inside surface to generate a layer of compressive residual stress at least 1 mm (0,040 in) deep as measured by ASTM E837. Revise Table 18 as follows:

Table 18 — Mechanical properties for new non-magnetic drill collars

Drill collar OD range

mm

70 through 98,4 101,6 through 174,6 177,8 through 279,4

Yield Strength

MPa min. 827 758 689

TensileStrength

MPa min. 896 827 758

Elongation stainless

steel collars

% min.

16 18 20

Elongation non-ferrous collars % min. 13

13 13

Change current clause 8.3.5 to 8.3.6.

SPECIFICATION FOR ROTARY DRILL STEM ELEMENTS 7

Add the following new Clause 12.

12 Stabilizers

12.1 General

This Clause applies to String Stabilizers and Near-bit Stabilizers, with either Integral-Body or Welded-Blade construction. The important dimensions of stabilizers are defined in Figure 12.

12.2 Definitions

12.2.1

stabilizer (blade) diameter

diameter at largest cross section

12.2.2

wrap angle

total angular extent of full blade diameter, summed across all blades

12.2.3

crown length

axial extent of full blade diameter (except as noted in Figure 15 for watermelon profile) 12.2.4 neck

region at upper and lower end of stabilizer containing connections 12.2.5 blade

enlarged region intended to make contact with the borehole 12.2.6 core

the continuous member of a welded-blade stabilizer 12.2.7

integral-blade stabilizer

stabilizer made from single piece of material 12.2.8

welded-blade stabilizer

stabilizer made from welding blades to a core

8 ADDENDUM 3 TO ANSI/API SPECIFICATION 7-1/ISO 10424-1

Key

1 + 2 + 3 Wrap angle 4 Blade diameter 5 Blade width 6 Inside diameter 7 Blade taper angle 8 Crown length 9 Upper neck length 10 Lower neck length 11 Overall length 12 Neck diameter 13 Radius, 25 mm (1 in.) minimum, 2 places 14 Marking recess

Figure 12 — Measurement Definitions for Stabilizers

12.3 Material requirements

12.3.1 General

Stabilizers may be made from standard steel or non-magnetic stainless steel. Standard steel shall be used unless non-magnetic material is specified. Integral-body stabilizers or the core of welded-blade stabilizers made from standard steel shall be quenched and tempered full-length. 12.3.2 Neck regions

12.3.2.1 Tensile requirements

The neck regions of an integral stabilizer, and the core of a welded-blade stabilizer shall have tensile properties equal to those of drill collars of the same size, as detailed in Table 17 (Table A.17) or Table 18 (Table A.18) of this specification. 12.3.2.2 Impact energy requirements

The neck regions shall also meet the impact energy requirement of Sub-clauses 8.2.1.3 or 8.3.3 of this specification.

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