Get in touch with Welong Company
Who we are
A professional international integrated supply-chain partner for the oilfield.
Founded in 2001, China Welong supports oilfield and customized industrial orders through supplier development, purchasing supervision and quality-control support. Each quotation identifies the responsible manufacturer and inspection scope.
Each order is reviewed against the buyer specification, agreed inspection scope and document requirements before release.
“Empowering the World with the Finest Supply Chain of China.”
Founded
Since
2001
2001
8
Core product
families
families
Per order
Commercial terms
by quotation
by quotation
Markets
Confirmed
by order
by order
02 / TIMELINE • Our history
Founded in 2001, one direction.
01
2001
Founded in Xi’an
China Welong is established in Shaanxi as an integrated supply-chain service provider for oilfield products.
02
2000s
Quoted manufacturing route
Supplier coordination of forging and machining, backed by specification and inspection-aligned quality control on every part.
03
2010s
Global partnerships
Supplier and inspection details are confirmed for the selected item and order.
04
Today
Markets confirmed by order
Markets and delivery destinations are confirmed for the selected order.
03 / PRODUCTS
Eight product families, one quality standard.
01
Downhole Drilling
Drill collars, stabilizers, hole openers, drilling jars, mud motors, roller reamers, tricone & PDC bits.
02
Elevator Bail
Forged bails and links for hoisting drill strings — high-tensile, load-rated, fully traceable.
03
Fishing & Milling
Overshots, spears and section mills for stuck-pipe recovery and downhole junk removal.
04
Bucking Unit & Power Tong
Make-up and break-out torque equipment for reliable, repeatable tubular connections.
05
Wellhead & Well Control
Wellheads, valves and surface control equipment engineered for pressure integrity.
06
Cementing
Cementing tools and accessories for zonal isolation and casing integrity.
07
Work Rolls
Forged rolls for rolling mills — dimensionally stable, wear-resistant, hardness-verified.
08
Custom Forgings
Forged shafts and bespoke components quoted against your technical drawing and agreed inspection scope.
Certifications & quality
Quality evidence for the order
Order quality evidence
Quality Management
Quality documents and inspection scope are confirmed for the selected order.
selected specification
Drill Stem Elements
Applicable specifications are confirmed for the selected item and quoted manufacturer.
UT · MT · Dimensional
Inspection
Non-destructive and dimensional testing before the selected order.
3rd-Party Ready
Independent Check
Third-party inspection scope can be added when agreed in the quotation.
A1
Quality advantage
Premium alloy steels, heat-treated to standard, and controlled at every step — reliability you can put downhole with confidence.
A2
Order evidence
Specifications, inspection scope and available order documents are confirmed for the selected item and quoted manufacturer.
A3
Engineering and inspection support
Engineering review and inspection support are agreed against the buyer drawing and purchase specification.
08 / Values
Five values, held since 2001.
V1
Righteousness before Profit
with the customer’s heart as our heart
V2
Integrity as the Foundation
V3
Professionalism as the Purpose
V4
Collaboration for Win-Win Outcomes
V5
Striving for Excellence
Have a drawing or a spec? Let’s build it.
Tell us what you need — a single tool or a full package — and our team will come back with a quote and the right engineering guidance.
Request a Quote →
oiltools@welongpost.com
+86 029 8833 1331
Xi’an, Shaanxi, China
Working with China Welong
Order Terms, Evidence and Next Steps
The commercial terms below apply to every order we quote, across every product line. They are the same terms our quotation repeats back to you, so nothing on this page has to be re-negotiated once a drawing is on the table.
What we make, and from what
We work from 2D drawings and 3D CAD models (AutoCAD, Pro/ENGINEER and SolidWorks; .dwg and .igs).
Founded in 2001. Manufacturing at Xi’an, Shaanxi and at Jiyuan, Henan, with 30+ engineers on staff.
Forgings from 0.2 to 50 tons, finished to 0.01 mm machining precision. Material standards to ISO, BS, ASTM, ASME, DIN, JIS and GB.
How the price is set
Send a drawing and we reply within 24 hours; a drawing-based quotation follows in 1–3 working days.
Payment is T/T or L/C. We ship EXW, FOB, CFR or CIF; other Incoterms on request.
Orders ship in standard export wooden cases, or the packing you specify.
When it ships
Production lead times are confirmed with your quotation, based on quantity, process route and finishing scope.
We hold agreed items in stock and ship against your release to shorten delivery.
Who makes it, and who answers for it
Every quotation states whether the item is made in our own works or by an approved supplier we developed and supervise.
Material mills are re-audited every two years and approved by Welong before they run your order.
The evidence that travels with the order
An EN 10204-3.1B material certificate with chemical composition and mechanical properties, a dimensional measurement report, and UT and MT reports ship with your order.
Inspection is by coordinate measuring machine, ultrasonic, magnetic particle and X-ray.
Each piece carries a stamped serial number and stays traceable for five years to its chemical composition, mechanical properties and measurement report.
What to send to start
Send the drawing or a photograph of the part, the dimensions, the material requirement and the quantity to oiltools@welongpost.com, call +86 029 88331331 or message WhatsApp +86 135 7217 2362, or use the enquiry form on our contact page.
An engineer reviews it and comes back within 24 hours.
| Term | What we commit to |
|---|---|
| Quotation turnaround | Reply within 24 hours; drawing-based quotation in 1–3 working days |
| Production schedule | Confirmed with your quotation, by quantity, process route and finishing scope |
| Drawing formats | 2D drawings and 3D CAD models (.dwg, .igs) |
| Company | Founded in 2001 |
| Machining precision | 0.01 mm |
| Forging envelope | 0.2 to 50 tons |
| Serial traceability | 5 years, with the test coupon retained |
| Documents with shipment | EN 10204-3.1B certificate, measurement report, UT and MT reports |
![Choke & Kill Hose: [Field Guide]](https://welongoiltools.com/wp-content/uploads/2026/07/choke-kill-hose-guide-featured-1-150x150.png)
