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INDUSTRY CLUSTER · Equipment

Jianhu oil and gas wellhead equipment

One drop in a wellhead hydrotest may come from forging inclusions, seal-groove dimensions, overlay, heat treatment, seals, assembly torque or test blinds. Credible delivery links material heat, machining revision, pressure boundary and test curve to the unit rather than treating a certification mark as field suitability.

Formation and regional foundations

Jianhu places forging, casting, heat treatment, machining, valves, wellhead assemblies and public testing in proximity. Short distances help sample return and failure analysis but do not let different pressure, material or product-specification levels share one certificate.

Wellhead reliability is not the word high-pressure. Every pressure boundary needs material identity, dimensional datum, assembly record and witnessed test. Jianhu’s complete chain reduces field risk only when it closes in the unit data book.

Core geography: Centred on Jianhu High-tech Zone, the development zone and petroleum-equipment concentrations, covering casing and tubing heads, production trees, well-control equipment, choke and kill manifolds, high- and medium-pressure valves and drilling and workover tools. General machining, farm machinery and service-only firms are excluded.

Pressure-boundary chain from forging heat to wellhead data book

Six nodes across material, machining, treatment, sealing, assembly and pressure test

Certification, statutory licence and field condition answer different questions; the data book points to the legal entity and product.

  • Forging and casting heats — Material level, heat, sampling and NDT state transfer with the blank.
  • Dimensions and seal grooves — Bore, flange, holes and seal faces follow drawing revision.
  • Heat treatment and overlay — Hardness, HAZ and corrosion-resistant layer bind to part serial.
  • Seals and stems — Metal seals, elastomers, gates and stems pair to service.
  • Clean assembly and torque — Orientation, clearance, tightening and lubrication form unit history.
  • Hydrotest and data release — Pressure ramp, hold, leak, function and certificates close on one ID.

01 · State pressure, temperature and material first

High-pressure wellhead is not a full specification.

The specification separately states working and design pressure, temperature, medium, sour condition and product specification. Production, gas, fracturing and injection do not share a default service.

Casing head, tubing head, tree, valves and manifold define interfaces, bore, flange class, outlet and field loads. An assembly needs more than an outline.

Applicable standards, customer supplements, third-party witness and document language freeze at design input; later changes use approved deviations, not verbal relaxation.

02 · The forging heat must survive subcontracting

The material certificate follows every cut and transfer.

Forgings and castings record heat, material level, chemistry, treatment and sampling position; split parts retain the parent heat relation.

Ultrasonic, magnetic-particle or penetrant methods follow material, surface and flaw direction. Area, sensitivity, block and repair location enter a defect map.

Subcontract treatment or rough machining transfers marks, quantity, mass and mix prevention. Return first confirms identity before dimensions; a supplier stamp does not replace verification.

03 · Seal grooves sit closer to failure than outline dimensions

Datum, tool and texture jointly determine sealing.

The route card fixes drawing revision, datum, tool offset and critical dimensions. Flange holes, bore coaxiality and seal groove are verified in one coordinate relation.

Metal ring grooves and seats control size, roundness, roughness, lay and damage. Conforming numbers retain profile or point records.

After first-piece approval, tool wear and thermal drift remain monitored. Sampling follows capability; rework states removal and effect on pressure-wall thickness.

04 · Overlay and treatment must preserve two materials

A sound overlay cannot come at an over-hard base.

Before overlay, base identity, groove, preheat and filler lot are checked. Current, voltage, interpass temperature and layers are recorded; dilution is not defined by nominal filler grade.

Treatment curves bind to load and thermocouples, heat-up and soak. Hardness covers base, HAZ and overlay; averages do not hide outliers.

Repair weld and re-treatment have approved limits. NDT and dimensions repeat afterwards; original flaw and repair records remain.

05 · Pair seals to medium and temperature

Same-size seals may not have the same capability.

Metal rings, elastomers, seats and packing each record material, hardness, lot, shelf life and storage. Sour, low-temperature or fracturing-fluid conditions enter selection.

Gate and seat are lapped and numbered as a pair. Cleanliness, coating and lapping are checked before assembly; disassembly cannot lead to unrecorded rematching.

Grease, anti-seize and cleaner also prove media and temperature compatibility; auxiliary materials remain in contamination and seal analysis.

06 · Assembly records must replay an operation

Orientation, clearance, torque and stroke are functional data.

Before assembly, part serial, cleanliness and protection are checked; pressure passages use scope or wipe. Debris comes from chips, grit, packaging and tools.

Bolts receive torque or preload by material, lubrication and sequence. Flange gap, stem travel and handwheel direction are recorded with wrench ID.

No-load and pressurised operation separately measure torque, indication and interlock. An extension bar is not a fix; fit, seal and alignment are reviewed.

07 · The hydrotest curve says more than passed

Test tooling can create a false leak.

Before hydrotest, boundary, blinds, tightening, venting and safety distance are checked. Medium condition is controlled and gauges suit range, accuracy and calibration.

Pressure steps, stabilisation, hold, depressurisation and leak observation form a continuous record. A drop first checks temperature, trapped air and tooling before the product seal.

After test, drain, dry, protect and recheck seal faces and function. Test water cannot remain in dead legs that will contact hydrocarbons.

08 · The data book must support one field teardown

Marks, licences and reports each have limits.

The data book lists order, drawings, heat, treatment, overlay, dimensions, NDT, assembly, function and pressure tests. Certificates check entity, specification, scope and validity.

Pressure and temperature define a qualified boundary; medium, sour condition, erosion, sand and cycling still match each well. A statutory licence does not prove field suitability.

On a field leak or torque anomaly, pressure curve, location and teardown order are preserved before serial trace to seal, machining and material. Conclusions separate design, manufacture, transport, installation and operation.

Sources and reading notes

Cluster identity and scale use MIIT, Yancheng and Jianhu government sources; wellhead products and NDT boundaries reference national standards. Entity, location, product and control are cross-checked with government profiles, EIA and company sites. Certification status is rechecked at shipment rather than inferred from an old mark.

  • The MIIT list confirms the national name of Jianhu’s wellhead-equipment cluster.
  • A 2024 Jianhu source records more than 1,100 petroleum-machinery manufacturers.
  • The same source records RMB 10.5 billion in 2023 invoiced sales.
  • The same source states that more than half of firms hold American Petroleum Institute certification.

Related companies

These companies have a locally relevant industry role supported by public information. Order is not a ranking, inclusion does not imply authorization, partnership or endorsement, and Hello China does not participate in or guarantee transactions.

A company may request a free correction or removal through the formal channel if its record is inaccurate or it does not wish to be shown. Do not send business licences, authorization letters or other sensitive files through insecure channels.

  • Jianhu Hongda Valve and Fitting Co Ltd — Hongda develops and makes gas wellheads, trees, choke and kill manifolds and ultra-high-pressure valves in Jianhu, with government-described digital traceability from material to shipment. Pressure and specification follow the order.
  • Yancheng Ruide Petrochemical Machinery Co Ltd — Ruide makes wellheads, trees, casing heads, manifolds, blowout preventers and high-pressure valves in Jianhu. Site-stated certification and pressure claims still require issuer-directory checks for entity, scope and validity at shipment.
  • Yancheng Xudong Machinery Co Ltd — Xudong makes production, gas, injection and fracturing wellheads and trees, plus casing heads, manifolds and safety-valve controls in Jianhu. Each product is described by its own pressure, temperature and interfaces.
  • Request a company-record correction or removal — Requests are reviewed by a person, handled promptly after verification, free of charge and not tied to commercial cooperation.

Sources

Use the original publishers to check dates, scope and definitions; public material is not a transaction guarantee.