ROTARY DRILL-STEM NAVIGATOR
API 7-1 and ISO 10424-1 Buyer Guide
API 7-1 and ISO 10424-1 provide a reference framework for selected rotary drill-stem elements. A complete enquiry still needs to define the exact component, construction, material, dimensions, connections, operating duty and acceptance evidence.
Start with the component and its duty
Heavy-weight drill pipe, drill collars and related BHA components perform different jobs in the string. The purchase description should begin with the component function and drilling programme, not only a nominal size.
- HWDP transition, weight and stiffness duty
- Drill-collar weight-on-bit and BHA stability
- Vertical, directional or extended-reach well profile
- Expected axial, torsional, bending and wear exposure
Define construction and material
OAK’s current master data records integral and welded HWDP routes and heat-treated alloy-steel drill collars. The selected route and properties must be confirmed for the order.
- Integral HWDP: modified AISI 4145H, quenched and tempered
- Welded HWDP: AISI 4145H end components with 1340-series tube body
- Drill collars: modified AISI 4145H with controlled full-length heat treatment
- Chemistry, mechanical properties, hardness and toughness requirements
Fix every functional dimension
Nominal size alone does not define interchangeability or drill-string performance. Body, upset, bore, connection and handling dimensions should be reviewed together.
- OD, ID, length and required weight
- Centre upset, spiral or wear-pad geometry for HWDP
- Bevel diameter, drift and bending-strength-ratio inputs for drill collars
- Exact pin and box connection with mating-component check
Plan verification and release evidence
Inspection should follow the actual manufacturing route and the features that carry load, make up, wear or transition between sections.
- Material identity and heat-treatment records
- Full-length, end-area and weld-zone NDT as applicable
- Connection gauging, dimensions, straightness and surface condition
- Hardbanding, marking, traceability, packing and final release dossier
ENQUIRY CHECKLIST
Information to prepare.
Use this list as an initial procurement guide. The governing design and purchase documents remain authoritative.
Send Your Requirement- 01Component type, quantity and applicable edition
- 02Integral / welded or slick / spiral configuration
- 03Material, heat treatment and required properties
- 04OD, ID, length, upset / bevel and handling features
- 05Complete pin and box connection designation
- 06Well trajectory, loads and service environment
- 07Hardbanding, thread treatment and surface requirements
- 08NDT, gauging, documents, packing and destination