Wellhead Valve Group Skids
Multi-well production manifold assemblies -- factory pre-fabricated with all valves, chokes, and instruments integrated for immediate field connection.
The Production Hub for Every Multi-Well Pad
When multiple wells produce into a shared gathering system, a wellhead valve group manifold is the central routing hub: it combines individual well production streams into a shared production header, allows each well to be individually isolated or routed to a test separator, and provides the physical infrastructure for per-well production management.
Tight Oil and Gas Multi-Well Pad Development
Horizontal well pad development concentrates all wellhead production at one point. The manifold receives production from every well, manages routing to the production or test header, and provides isolation and choke capability. Factory pre-fabrication minimizes time between completion and first production.
Coalbed Methane and Shale Gas Wellfields
CBM and shale gas developments involve many relatively low-flow wells. A compact valve group manifold combines cluster well flows and routes them to the pipeline. These demand manifolds designed for low-pressure gas service, individual well metering, and a compact footprint.
Conventional Multi-Well Oilfield Gathering Stations
In conventional oilfields, the wellhead valve group at the station inlet provides routing between individual flowlines and the separator train. Each well can be routed to production or test separators, with provisions for chemical injection and safety shut-in.
Remote Unmanned Sites with Automated Well Control
Remote wellsites require skids with motorized or pneumatically actuated isolation and choke valves for remote operation, automated shutdown on abnormal conditions, and SCADA integration providing real-time P/T/flow data to the control centre.
Integration Reference
Wellhead valve group skids are combined with separator skids and chemical injection systems to form a complete wellsite facility.
Manifold Design -- Routing, Pressure, and Per-Well Control
The Dual-Header Principle
The fundamental design of a production and test manifold uses two parallel headers:
- Production Header: Receives commingled production from all wells under normal operations. Connects directly to the gathering pipeline or station separator inlet.
- Test Header: A separate, smaller-diameter header that receives production from one well at a time. Connects to the test separator for single-well measurement.
A three-way routing valve (or dual isolation valve pair) at each well inlet allows independent routing without interrupting other wells.
Per-Well Choke Valve
A choke valve on each well inlet provides back-pressure control, determining the well's producing flowing pressure and rate.
- Fixed orifice chokes: simple, low-cost; rate adjusted by replacing the choke bean.
- Adjustable chokes: needle or cage-type; flow area adjusted continuously; preferred for frequent adjustments or remote control.
Per-Well Check Valve & Instrumentation
Prevents backflow from the higher-pressure production header into the well, protecting the wellbore completion. Each inlet is instrumented with a pressure gauge, pressure transmitter (4-20 mA), and temperature gauge to monitor flowing tubing pressure.
Manifold Header Sizing
Sized for the combined flow of all wells at maximum rates. LINSON OIL uses multiphase flow calculations with minimum velocity (preventing liquid slug) and maximum velocity (preventing erosion) constraints.
Engineering Specifications
Standard ranges and configurations for multi-well skids.
| Parameter | Standard Range | Notes |
|---|---|---|
| Number of Well Connections | 2 - 20 per skid | Larger configurations with multiple skids |
| Header Configuration | Production + test dual-header | Single or triple-header on request |
| Individual Well Flowline Size | DN25 (1") - DN150 (6") | Per well flow rate |
| Production Header Size | DN50 (2") - DN300 (12") | Per total well count and flow rate |
| Design Pressure -- Wellside | 5.0 - 35.0 MPa (g) | Per wellhead shut-in pressure |
| Design Pressure -- Header Side | Per gathering system pressure | Often lower than wellside |
| Body Material | Carbon steel / 316L SS / Duplex SS | Per fluid and H₂S/CO₂ content |
| Choke Type | Fixed orifice / Adjustable | Per production requirement |
| Design Code -- Piping | ASME B31.3 / GB/T 20801 | GC2 licensed |
| Valve Standard | API 6D / API 6A | Per design pressure class |
Well Count vs. Skid Configuration
- 2-4 wells Single compact skid
- 5-8 wells Single medium or two-module
- 9-16 wells Two-skid arrangement
- 17-20+ wells Three+ skids; PLC control
Standard Skid Package
- Individual well inlet connections
- Per-well isolation valve (full-bore ball valve, API 6D)
- Per-well choke valve & check valve
- 3-way routing valve or dual-valve routing assembly
- Production header and test header
- Header isolation valves
- Per-well: pressure gauge + transmitter + temp gauge
- Header drain, vent, and chemical injection connections
- Structural skid frame (primer + finish coat)
- Factory function test & As-built dossier
OEM / ODM Customization
| Motorised/pneumatic routing valves | Remote well routing from control room |
| Automated well testing system | PLC-controlled sequential well testing |
| Motorised adjustable chokes | Remote production rate control via SCADA |
| SCADA integration | Real-time wellhead P/T/flow to control centre |
| Sour service package | NACE MR0175 compliant materials |
| High-pressure design (> 20 MPa) | Deep high-pressure wells; API 6A chokes |
| Low-temperature package | Arctic wellsite service (-46°C) |
| Third-party inspection | SGS / BV / DNV for international projects |
Wellhead-Rated Piping. High-Pressure Valve Certification. Factory Tested.
Certifications
- ▪ GC2 Pressure Piping Components License
- ▪ ASME B31.3 / GB/T 20801 Piping Design
- ▪ API 6D / API 6A Valve Specifications
- ▪ ISO 9001:2015 & ISO 3834-2
- ▪ CNAS Accredited Laboratory
- ▪ NACE MR0175 / ISO 15156 Available
- ▪ Sinopec & CNPC HSE Certified
Wellside Pressure Rating Verification
Design pressure confirmed against well shut-in tubing head pressure (SIHTPH) before drawing release, preventing serious dimensional design errors.
Valve Certification Review
All valves procured with manufacturer's test certificates per API 6D/6A. Material traceability reviewed for NACE sour service.
GC2 Piping Fabrication and NDT
Fabricated under GC2 license. CNAS-accredited in-house NDT: RT on butt welds, MT/PT on socket welds. 100% RT standard for high-pressure wellside piping.
High-Pressure Hydrostatic Test
All piping hydrotested at 1.5× design pressure per ASME B31.3. All routing combinations tested to verify leak-free operation.
Valve Routing Function Test
Each well's three routing positions physically tested. Positive isolation of shut-in position verified.
Instrument Loop Check and FAT Report
Transmitter outputs verified 0-100% range. Valve actuator feedback verified. FAT report issued with all test records signed off.
Production Manifold Skids -- Delivered to Upstream Operations.
Multi-Well Pad Production Manifolds
Standard infrastructure for multi-well pad development in major producing regions. Factory pre-fabrication ensures consistent quality across multiple identical pads in the same development programme.
Sinopec & CNPC Certified Supplier
Equipment must pass strict incoming HSE inspections. LINSON OIL's sustained certification reflects a multi-year delivery record across wellhead equipment categories.
Integrated Wellsite Package
Supplied as part of a complete package alongside separator and chemical injection skids -- providing single-source supply with one FAT event covering the full system.
Warranty Terms
Standard: 2 years from commissioning or 26 months from shipment -- covering piping integrity, valve mechanical function, instrument calibration, and skid structural integrity.
Long-term partners: up to 2.5 years, with priority access to replacement valve seats, choke beans, transmitters, and actuator kits.
After-Sales Support
- Choke bean resizing calculations for production rate adjustments
- Valve maintenance procedures for seat and seal replacement
- Additional well connection modules for new pad wells
- Automated upgrade engineering: retrofit of motorised valves
Well Count, Design Pressure, and Routing Requirement. We'll Design the Manifold.
Manifold sizing starts with your well count, wellhead design pressure, and routing requirement. For new pads, providing expected well flow rates and fluid composition allows us to size headers and chokes correctly. Our engineers respond with a preliminary manifold configuration within 1-2 business days.
Free Engineering Resource
Submit your well count and design pressure and receive:
- Preliminary manifold configuration
- Wellside pressure rating check
- Integrated wellsite package options
*Reviewed by LINSON OIL engineers. Response typically within 1-2 business days.*
Request a Quote
LINSON OIL -- GC2 Piping + API 6D/6A Valves | Wellhead-Rated Design | NACE MR0175 Available | Sinopec & CNPC HSE Certified