Get in touch with Welong Company
Oilfield Tools Manufacturing and Supply, Matched to Your Drawing
Oilfield equipment through a drawing-led engineering and supply route
Welong brings oilfield equipment—including downhole tools, well-control equipment, cementing equipment, drill bits, handling tools, hoses and tongs—into a drawing-led engineering and supply route. The route is built for oil and gas operators, drilling contractors and service companies that need the manufacturing route and inspection package defined before an order is released.
Material, Service-Condition and Final-Condition Review
Material decisions start with the duty, not a generic grade list. The enquiry should state the product family, requested grade, connection, temperature, pressure or load, and any sour-service or corrosion requirement. Those inputs are compared with the drawing, and the agreed material basis is placed in the quotation.
Inputs and quotation output by product group
| Product group | Inputs to state in the RFQ | Quotation output |
|---|---|---|
Downhole and drill string | Grade, connection, hole size, load, temperature and fluid exposure | Model or drawing route, material basis and inspection scope |
Wellhead and well control | Pressure rating, bore, temperature class, fluid and material class | Product-level configuration and governing specification |
Handling and tong equipment | Tubular OD, load, torque, interface and operating method | Matched model and acceptance checks |
Hoses | Service, working pressure, temperature, ID, length and end connections | Hose family, end configuration and test-document plan |
Mill rolls and forgings | Material, heat treatment, dimensions, hardness target and machining allowance | Manufacturing route and inspection hold points |
Surface Protection and Final-Condition Controls
Surface treatment is quoted against the product, transport route and service condition. State the required coating or protection system, colour, thickness or roughness target, protected interfaces and packing restrictions. The quotation then records what is included, who performs it and which inspection record is supplied.
Keep sealing faces, threads and gauging surfaces separate from general coating instructions.
State whether hardness, roughness, coating thickness or visual acceptance requires a report.
Identify preservation and packing requirements for sea, air or long-term storage.
Place buyer witness points in the inspection plan before production starts.
Product Centres for Oilfield and Industrial Procurement
Browse the product centres below, then send the model, drawing or service envelope for a product-level check.
Downhole Drilling Tools
Model or drawing routeHole, load and connection
- stabilizers, drill-string components, drilling jars, mud motors, roller reamers and related tools.
- Send the model, drawing or service envelope for a product-level check.
Wellhead & Well Control
Pressure-control routeBore, pressure and class
- casing and tubing heads, blowout preventers and pressure-control assemblies.
- Send the model, drawing or service envelope for a product-level check.
Fishing & Milling Tools
Recovery objectiveFish, hole and connection
- overshots, fishing jars, scrapers, junk mills and taper mills.
- Send the model, drawing or service envelope for a product-level check.
Drill Bits (Tricone & PDC)
Tricone or PDCFormation and hole size
- tricone and PDC options routed by formation, hole size and operating plan.
- Send the model, drawing or service envelope for a product-level check.
Cementing Tools
Casing programmeSize and plug arrangement
- centralizers, float equipment and cement heads.
- Send the model, drawing or service envelope for a product-level check.
Oilfield Tongs & Bucking Units
Tubular handlingOD, load and torque
- manual and powered tubular-handling systems.
- Send the model, drawing or service envelope for a product-level check.
Pipe Handling Tools
Model matchingTubular OD and load
- elevators, links, slips and clamps.
- Send the model, drawing or service envelope for a product-level check.
Oilfield Hoses
Service and pressureID, length and ends
- drilling, control, choke and kill hose families.
- Send the model, drawing or service envelope for a product-level check.
Mill Rolls
Industrial product centreGrade and mill duty
- work rolls and other roll families matched by grade, heat treatment and mill duty.
- Send the model, drawing or service envelope for a product-level check.
Industrial Forgings
Drawing-based routeMaterial and heat treatment
- shafts and drawing-based forged components.
- Send the model, drawing or service envelope for a product-level check.
How the manufacturing route is identified
Welong routes product enquiries through the Jiyuan manufacturer or another responsible producer named in the quotation. The Xi’an address is the company headquarters, and the order documents identify the manufacturing route and inspection records.
Not sure which model fits the service envelope?
Check the Specification EnvelopeRepresentative Product-Level Specification Envelopes
These rows are starting points for model selection, not a company-wide capability claim. The final drawing, connection, service condition and applicable standard govern the order.
| Product family | Verified catalogue envelope | RFQ decision |
|---|---|---|
| Drilling jars | 3-1/8–9-1/2 in OD; 79,000–670,000 lb maximum working load | Select model, connection and jarring requirements |
| Drilling mud motors | 1-7/8–7-7/8 in hole size; 0.5–16 L/s flow | Confirm hole size, flow, torque and connection by model |
| Roller reamers | 6–42 in hole size | Confirm placement, connection and formation conditions |
| Annular and ram BOP models | 2,000–15,000 psi working pressure | Confirm bore, pressure, temperature and material class |
| Cement heads | 5-1/2–13-3/8 in casing; 35 or 50 MPa working pressure | Match casing size, connection and plug arrangement |
| Junk mills | 80–425 mm OD across 14 listed sizes | Confirm fish, hole ID, connection and dressing |
| Pipe elevators | 1.05–36 in size range; 27 kN–500 t listed working-load range | Match tubular OD, profile and model-specific rated load |
| Casing scrapers | 4-1/2–13-3/8 in casing range | Confirm casing ID, connection and cleaning objective |
Use the envelope to route the enquiry
The model, connection, material and inspection scope are fixed in the quotation.
Check the specification envelopeNext step
- Send the product family and model if known
- Add the drawing and service condition
- Confirm quantity and required date
Inspection, Documentation and Release Evidence
Inspection planning is agreed before production. Each quotation identifies the material certificate, dimensional report and order-specific NDT reports included with the shipment, together with any buyer or third-party witness point.
| Control point | What is checked | Order evidence | Boundary |
|---|---|---|---|
| Material identity | Heat or batch reference matched to the order | Material certificate named in the quotation | Document type follows the agreed order |
| Dimensions | Drawing dimensions and product-specific acceptance points | Dimensional report | Final drawing and revision govern |
| Non-destructive examination | Method and acceptance points in the inspection plan | Order-specific NDT reports where required | Included only where the product and plan call for it |
| Witness points | Buyer or third-party hold and witness points | Inspection records identified in the quotation | Agreed before production |
| Release and shipment | Released item identity and document identity | Shipment dossier tied to the same item | No blanket company-wide evidence claim |
What the standards references mean
Standards named on this page define product or document requirements; they do not establish a separate company authorization claim.
Product specifications and editions are confirmed in the quotation.
Buyer-approved drawings, the responsible producer’s model tables, Welong quotations and agreed inspection plans are the order-specific references for the product supplied.
References and source owners
- ISO 11961:2018 — steel drill pipe.
- ISO 10423:2022 — wellhead and tree equipment.
- ISO 13533:2001 — drill-through equipment.
- API standards programme — source owner for API product specifications.
- EN 10204 — types of inspection documents for metallic products; the document type is agreed in the order.
Define the inspection package in your RFQ
Send the drawing and acceptance requirements →
Quotation, Price Drivers and Delivery Commitment
Price is set by material, geometry, quantity, manufacturing route, inspection scope, documentation and destination. We do not publish one price or one production lead time across unrelated product families.
What the quotation fixes
- The first response arrives within 24 hours and flags missing technical inputs.
- A drawing-based quotation follows in 1–3 working days when the input is complete.
- Each quotation names the manufacturing route, included inspection records and commercial terms.
- A committed delivery date is tied to the quoted quantity and inspection plan.
Order Control from Drawing Review to Shipment
The same order identity follows the technical route, inspection and released shipment.
| Stage | Control | Output |
|---|---|---|
| 1. Scope review | Product family, drawing, service condition and missing inputs | Complete enquiry basis |
| 2. Technical route | Existing model or drawing-based manufacturing route | Named technical route |
| 3. Quotation control | Material, route, inspection, documents and delivery | Controlled quotation |
| 4. Production route | Responsible producer and manufacturing route named in the quotation | Order-linked production |
| 5. Inspection and release | Agreed drawing and inspection plan | Release evidence |
| 6. Shipment dossier | Released items and documents under the same identity | Auditable shipment file |
Traceability a Buyer Can Audit
Welong uses order records rather than unsupported counters as homepage proof. Parts released with the agreed document package carry a serial number linked to the order record.
Connect the item to its release evidence
The quotation names the responsible producer and manufacturing route, so a buyer can connect the ordered item to its inspection and release records.
The final drawing, inspection plan and quoted document package govern the order.
Order Records and Product Evidence
Order identity
Product, drawing revision and order reference
Material record
Certificate named in the quotation
Dimensional report
Acceptance against the agreed drawing
Order-specific NDT
Reports supplied where the plan requires them
Responsible producer
Named with the manufacturing route
Shipment dossier
Tied to the same released item identity
Ask the quotation to name each link before production begins.
FIELD
WHAT IT NAMES
WHY IT MATTERS
Product and order
Item, drawing revision and order identity
Connects the requirement to the released item
Responsible producer
Producer and manufacturing route named in the quotation
Separates headquarters from the production route
Material
Certificate and heat or batch reference
Ties material identity to the order
Dimensions
Report against the agreed drawing
Records product-specific acceptance points
NDT
Order-specific reports where required
Keeps the evidence within the agreed inspection plan
Release and shipment
Released item and shipment dossier identity
Keeps the physical item and documents together
Scope Boundaries Before You Send an RFQ
This homepage covers manufacture and supply against a model, drawing or defined service envelope. Welong does not quote rework of used equipment on this site. It also does not apply one company-wide pressure, size, material or lead-time number across unrelated product centres.
If the requirement sits outside a published product envelope, send the drawing and service conditions. We will either identify a route in the quotation or decline the scope before the order is placed.
Route named in the quotation
The quotation identifies the responsible producer, manufacturing route and inspection scope.
No blanket certification claim
A cited product specification is not presented as a separate company authorization.
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IN-PERSON INDUSTRY ENGAGEMENT
Welong at Oilfield Industry Exhibitions
Scenes from exhibition-floor conversations, booth presentations and technical exchanges at oilfield industry events attended by Welong.
Procurement Questions
Use these answers to prepare the first enquiry. Product-level specifications, manufacturing route, inspection records and the committed date are fixed in the quotation.
How quickly will Welong respond to an enquiry?
The first response arrives within 24 hours. When the technical and commercial input is complete, a drawing-based quotation follows in 1–3 working days; otherwise, the response identifies what is still needed.
Which files can I send?
IGES and DWG files are accepted.
Where should I start if I do not know the exact model?
Start with the relevant product centre and send the operating envelope. Hole or tubular size, connection, pressure or load, fluid, temperature and required date usually narrow the route. If a catalogue model does not fit, attach the drawing so the quotation can state a drawing-based route or decline the scope before order.
Does Welong manufacture every item on this website?
No single route applies to every product. Each quotation names the responsible producer and manufacturing route, together with the applicable inspection and release requirements.
Does a cited API or ISO specification mean Welong is certified?
No. A specification defines product or test requirements. A company authorization is a separate claim and is not made on this homepage without current, entity-matched evidence.
What documents can be included with the shipment?
The quotation lists the material certificate, dimensional report and order-specific NDT reports included. The exact package follows the product and inspection plan.
How is production lead time set?
The quotation sets the committed date.
Can Welong review my material or coating requirement?
Yes. State the requested material, service environment, heat treatment, surface condition and acceptance requirement. We record the agreed basis in the quotation.
How do I know who is responsible for the manufacturing route?
The quotation names the responsible producer and manufacturing route. Inspection and release requirements are attached to that route.
What should I include in the first RFQ?
Send the product or drawing, quantity, dimensions, connection, material, pressure or load, service environment, inspection requirements, destination and required date.
Send the Drawing and Define the Route Before Order
Attach the drawing or specification sheet and include quantity, service condition, inspection requirements, destination and required date. We will identify missing inputs in the first response and return the manufacturing route, document package and delivery commitment in the quotation.
Email oiltools@welongpost.com, call +86 029 88331331, or message WhatsApp +1 (929) 265-1341.
