美国石油协会API7-1(3)

SPECIFICATION FOR ROTARY DRILL STEM ELEMENTS 9

Testing of standard steel stabilizers is required on each heat per heat treatment lot. 12.3.2.3 Special testing requirements of integral stabilizers

For an integral-blade stabilizer, the tensile and impact specimens shall be taken from a prolongation of either neck, with the center of the specimen at least 100 mm (4 in.) from a free end, and at least 25 mm (1 in.) below the finished surface of the neck as shown in Figure 13. The prolongation shall be the same diameter as the neck at the time of heat treatment. The uniform region shall extend for at least 400 mm (16 in.) from each end of the finished stabilizer, or to within 25 mm (1 in.) of the stabilizer blades, whichever is less, as shown in Figure 13. The extent of the area of controlled properties shall be verified by Brinell hardness testing, with a minimum hardness of 285 HBW.

When standard steel material is heat-treated as a forging or bar, without knowledge of the final neck diameter, the sampling location shall be determined by the largest diameter of the forging, or the diameter of the bar. In all cases, the radius of the sample location shall be reported.

Table 32 — Sampling requirements

Maximum Diameter of forging or bar

< 188 189 to 245 248 to 508

All dimensions are in millimeters

Radius of Sampling in neck region

35 57 76

>508 89 Key

1, 2 Zone of uniform hot working heat treatment or warm forging 3 Distance from end of forging or bar for mechanical sample 4 Depth below surface of finished neck for mechanical sampling 5 Radius of sampling for forging or raw bar 6 Prolongation

Figure 13 — Sampling locations

12.3.2.4 Traceability

The manufacturer shall establish and follow procedures for maintaining material identity. The methods of maintaining identity shall be at the option of the manufacturer. These procedures shall provide means for tracing the stabilizer body to the relevant heat, chemical analysis report, and specified mechanical test results.

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

12.3.3 Body regions

An integral-blade stabilizer shall be machined from a single piece of material. The core and necks of a welded-blade stabilizer shall be machined from a single piece of material. The material shall be inspected for defects according to Clause 11 of this specification and shall meet the acceptance criteria as defined therein. Mechanical testing shall only be required for the neck region as defined above.

12.4 Blade Welding

For welded-blade stabilizers, there shall be a documented welding procedure (WPS and PQR) for the welding of blades to the stabilizer core, and welders or welding machines shall have documented qualification (WQR) to this procedure. The welds shall be inspected using a documented procedure of Non-Destructive Evaluation.

NOTE Transverse welding at the ends of blades is not recommended.

12.5 Abrasion protection

The crown surface of the stabilizer shall be provided with protection against abrasion. The protection method is optional to the manufacturer unless specified by the purchaser and is outside the scope of this standard. However, a documented procedure for applying this protection shall exist (WPS for welded hard-facing), and welders or welding machines shall have documented qualification (WQR) to this procedure.

12.6 Dimensional requirements

The following dimensional requirements apply to all stabilizers covered by this standard. 12.6.1 Neck length

The length of upper and lower necks shall be as indicated in Table 33 (Table A.33)

Table 33 — Neck lengths

Location Upper Neck

Lower Neck, String stabilizer Lower Neck, Near-bit stabilizer

All dimensions in millimeters

Minimum lengths

760 600 450

12.6.2 Neck diameters

Upper and lower neck diameter shall be as described in Table 34 (Table A.34). Tolerances shall be the same as those defined for drill collars in Table 15 (A.15)

SPECIFICATION FOR ROTARY DRILL STEM ELEMENTS 11

Table 34 — Neck diameters and connections

Neck Diameter

Connection, Box x Pin

All dimensions are in millimeters

Box Connection, Near Bit Stabilizer

lower

121 NC38 3-1/2 REG 165 NC46 4-1/2 REG 171 NC50 4-1/2 REG 203 6-5/8 REG 203 6-5/8 REG 241 7-5/8 REG 241 7-5/8 REG 241 to 279

7-5/8 REG

279 8-5/8 REG

6-5/8 REG 7-5/8 REG 7-5/8 REG 7-5/8 REG 8-5/8 REG 8-5/8 REG

Inside Diameter

51 71 71 71 71 76 76 76 76

Blade Diameter 130 to 187 191 to 200 203 to 244 241 to 394 397 to 508 311 to 508 397 to 660 508 to 660 >660

12.6.3 Blade Dimensions

The blade diameter, length and number shall be as indicated in Table 35 (Table A.35).

Table 35 — Blade dimensions

All dimensions are in millimeters

Up-hole and downhole

a

blade taper angles Blade diameter +0/–0,8 Number of Blades, Integral Number of Blades, Welded Blade width (integral) ± 6 Blade width (welded) ± 6 Crown length min (see note)

130 to 187

3

191 to 244

3

30 ± 5 degrees integral 30-45 degrees welded 245 to 311 3 or 4

318 to 394

3 or 4

397 to 508 3 or 4

>508

4

3 3 3 3 3 3 51 64 76 89 102 102 38 51 51 64 76 76 305 406 457 457 508 508 NOTE The crown may be tapered at customer’s option to form a “watermelon geometry” as in Figure 15. The crown length includes the

length of this shallow taper

a The taper angle requirement applies only for the first 25 mm radially from the blade surface. If the blade height exceeds 25 mm, the taper angle for the remainder of the height may be up to 45 degrees at the manufacturer’s discretion. See Figure 14.

12.6.4 On gauge blade diameter

For a gauge stabilizer, the blade diameter shall be defined using a ring gauge of the same dimensions as the bit Not-Go gauge of Sub-clause 9.2.3.1 for the given nominal diameter. Other measuring methods may be used, with the ring gauge as arbiter in case of dispute.

The diametrical clearance to this gauge shall be 0 mm to 0,76 mm (0 in. to 0.03 in.) 12.6.5 Blade spiral

The spiral shall be as defined on the purchase order, and interpreted according to Table 36. Unless otherwise specified, the spiral shall be right-hand.

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

Table 36 — Blade spiral definitions

Spiral Description Straight blade Open spiral Full spiral Tight Spiral

Wrap Angle (see Figure 12)

Not applicable 180 – 220 degrees 300 – 350 degrees 500 – 600 degrees

12.7 Connections and bevel diameters

12.7.1 Size and type

The connections shall be as described in Table 34 (Table A.34). The bevel diameters for the upper connection of all stabilizers, and for the lower connection of string stabilizers shall be the same as those defined in Table 14 (Table A.14). The bevel diameter for the lower connection of near-bit stabilizers shall be as defined in Table 19 (Table A.19).

12.7.2 Gall Resistant Treatment for Threads and Sealing Shoulders

For standard steel stabilizers, a gall-resistant treatment of zinc or manganese phosphate shall be applied to the threads and sealing shoulders of both the upper and lower connections. Application of the treatment shall be after completion of all gauging. The treatment type shall be at the discretion of the manufacturer.

Key 1 2

Increased taper angle

Depth to start of increased taper angle

Figure 14 — Blade taper geometry

SPECIFICATION FOR ROTARY DRILL STEM ELEMENTS 13

Key 3 4

Crown length definition for watermelon geometry Typical crown taper of watermelon geometry

Figure 15 — Watermelon geometry

12.8 Customer information

12.8.1 Required information from customer a) Stabilizer type: String or near-bit b) Integral or welded c) Stabilizer (blade) diameter

d) Wrap: Tight Spiral, Full Spiral, Open Spiral or Straight e) Neck size and connections 12.8.2 Optional requirements

a) Connection Stress Relief features, per ISO 10424-2 (API Spec 7-2) b) Connection cold working

c) Connection surface treatment (optional for non-magnetic only) d) Non-magnetic e) Abrasion protection type f) Left hand spiral

g) Float valve recess on near-bit stabilizer

12.9 Marking

The following information shall be marked on a marking recess with steel stamps or milled lettering a minimum of 6 mm (0.25 in.) in height. This recess shall be located on the upper neck, as shown in Figure 1 within 100 mm (4 in.) of the stabilizer blades.

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