API 6A Forged Casing Tubing Head for Oil Gas Well - China Suppliers Factory Direct Supply
Product Description
This casing and tubing head assembly is API 6A certified wellhead equipment used for onshore and offshore oil & gas production wells. It integrates casing head and tubing head as an integral or split unit, responsible for suspending casing strings and tubing strings, sealing the annulus between pipes, and providing side outlets for pressure monitoring, bleeding and fluid circulation. The main body is forged from high-strength alloy steel, processed via quenching & tempering heat treatment to achieve balanced strength and toughness, applicable to crude oil, natural gas and sour service wells with hydrogen sulfide.
Product Features
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High Strength Forged BodyIntegral forging eliminates internal casting defects; quenched and tempered to obtain high tensile strength and impact toughness, resistant to high pressure and wellhead alternating load deformation.
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Dual Anti-Corrosion SolutionMain body can be nitrided on surface; sour service models meet NACE anti-H2S requirements, avoiding sulfide stress cracking in gas wells.
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Reliable Metal Sealing SystemAdopts metal hard sealing for long-term high-pressure sealing performance, no leakage under high temperature and pressure fluctuation, suitable for harsh oilfield working conditions.
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Flexible Structural SelectionTwo optional structures: integral type for compact installation; split type convenient for casing running and maintenance. Support single-layer and double-layer casing string matching.
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Complete Functional Side OutletsEquipped with standard side outlets for pressure monitoring, well fluid bleeding and circulation; matched manual gate valves with handwheels for easy on-site operation.
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Wide Application CompatibilityCustomizable for conventional oil wells, gas wells and ESP wells with cable penetrating tubing head structure available. Fit both onshore land wells and offshore platform wellheads.
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Strict Quality ControlAll forgings undergo full non-destructive testing; raw material chemical composition and mechanical property test reports are provided for each batch, meeting API PSL1~PSL4 product specification levels.
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Easy Installation & MaintenanceModular assembly design, standardized flange connection size, convenient disassembly for regular inspection, replacement of hangers and sealing parts without cutting the main body.
Product Specifications
| Item | Technical Parameters |
|---|---|
| Executive Standard | API 6A, NACE MR0175, PSL1/PSL2/PSL3/PSL4 optional |
| Main Body Material | 42CrMo, 42CrMoA, AISI 4140 alloy steel |
| Sealing Parts Material | 420J2 martensitic stainless steel |
| Rated Working Pressure | 2000PSI / 5000PSI / 10000PSI / 15000PSI / 20000PSI |
| Temperature Grade | U(-18℃~121℃), L(-46℃~121℃), P(-29℃~177℃) |
| Applicable String Type | Single string, double string |
| Structural Form | Integral one-piece forged type / Split flange type |
| Heat Treatment of Body | Overall quenching & tempering; surface nitriding optional |
| Sealing Structure | Metal-to-metal primary seal + auxiliary elastic rubber seal |
| Supporting Standard Parts | Casing hanger, tubing hanger, side gate valve, pressure gauge port, bleed valve, flange, stud & nut |
| Forging Inspection Standard | Full NDT (UT ultrasonic testing, MT magnetic particle testing) |
| Applicable Scenarios | Onshore oil well, offshore gas well, sour H₂S well, ESP electric submersible pump well |
Frequently Asked Questions
What quality standards do these casing and tubing heads meet?
Our casing and tubing head assemblies strictly comply with the API 6A standard and meet NACE MR0175 for sour service. Product Specification Levels (PSL) from PSL1 to PSL4 are available based on your requirements.
Are these assemblies suitable for H2S and sour gas environments?
Yes, our sour service models are constructed to meet NACE anti-H2S standards. The high-strength forged body undergoes tempering and heat treatment, with optional surface nitriding, to prevent sulfide stress cracking in corrosive gas wells.
What structural configurations do you offer?
We offer two structural forms: an integral one-piece forged design for compact installation space, and a split flange type that offers convenient handling during casing running and maintenance.
What pressure ratings and temperature ranges can this equipment support?
The assembly supports rated working pressures of 2000PSI, 5000PSI, 10000PSI, 15000PSI, and 20000PSI. Temperature ratings include Grade U (-18℃ to 121℃), Grade L (-46℃ to 121℃), and Grade P (-29℃ to 177℃).
What testing and quality control measures are implemented?
All forgings undergo comprehensive Non-Destructive Testing (NDT), including Ultrasonic Testing (UT) and Magnetic Particle Testing (MT). Raw material chemical composition and mechanical property reports are supplied with every batch.