Envelope Energy LTD

01/01/2026

Happy New Year 2026!

04/11/2025

07/10/2025

At ENVELOPE ENERGY, we deliver reliable API complaint wellhead maintenance solutions that ensure safety, production uptime, and regulatory compliance for our clients.

From
(1) Removal of built-up residue (2) Checking for wear, corrosion, leaks, or damaged to valves, seals, pressure gauges etc. (3) pressure testing (4) greasing & lubrication of valves
To
(1) Diagnostics (2) replacement of valve, seals, chokes, flowline etc. (3) Repair of pumps, backpressure or control system malfunction (4) welding, machining, or fabrication of custom parts (5) flushing & cleaning of flowlines, chokes valves, wellbore etc. we've got your wellhead asset covered.

Let's Keep your Wells Flowing with our API-6A compliant wellhead maintenance service that ensures zero downtime.

visit www.enevelopeenergy.com or email us at [email protected]

06/10/2025

A tubing spool is a component in a wellhead system located between the casing head and the production tree. It provides structural support and connection points, and allows safe pressure containment, sealing, and control over the tubing string and associated flows.

Functions and Roles:
(1) Supports and suspends the tubing hanger/tubing string.
(2) Provides sealing/pressure containment.
(3) Interfaces with surface equipment.
(4) Provides ports/interfaces for instrumentation and control lines.
(5) Supports safety and maintenance.

Design Features:
(1) Material and strength: High alloy steel compatible with the well environment (corrosion, H2S, CO2) and rated for appropriate pressure and temperature.
(2) Seal/packing system: Metal or elastomeric seals, ring seals, and gasketed interfaces to maintain the pressure boundary.
(3) Ports/crossovers: Side ports for sensing (pressure, temperature), annulus access, chemical injection, control lines, and testability before hookup.
(4) Compliance: API 6A
(5) Safety/redundancy: Redundant sealing paths, backup barriers, and designed to allow maintenance without full system depressurization.

Applications:
(1) Onshore/offshore wells.
(2) HPHT wells.
(3) Wells with instrumentation/chemical injection needs.
(4) Wells requiring frequent interventions or workovers.
(5) Injection/disposal wells and enhanced oil recovery/operations.

Advantages:
(1) Reliable pressure containment and sealing: Safe operation and prevention of leaks.
(2) Modularity and standard interfaces: Simplifies installation, maintenance, and upgrades.
(3) Multiple access points: Ability to instrument, inject, monitor without extra fittings.
(4) Structural robustness: Handles mechanical loads, vibration, and weight of piping/tubing.
(5) Ease of maintenance/testing: Ability to pressure-test, isolate, and service associated equipment.
(6) Longevity and durability: Good materials and correct design help resist fatigue, corrosion, and wear.

We deliver cost-effective well integrity management projects.
For more information, visit www.envelopeenergyltd.com or email us at [email protected].

03/10/2025

The CSBV-Series Ball Valve.

Functions;
(1) Provides on/off or shut-off control for liquid and gas flow.
(2) Capable of handling high-pressure, high-temperature service.
(3) Allows quick quarter-turn operation (90 degrees) for fast opening/closing.
(4) Ensure tight sealing to prevent leakage in pipelines.
(5) Can be used in manual, pneumatic, or electric actuation modes.

Design Features;
(1) Body Construction: Forged or cast carbon steel / stainless steel for durability in harsh environments.
(2) Full/Reduce Bore: Available in full-port for minimal pressure drop or reduced-port for cost efficiency.
(3) Floating/Trunnion Mounted Ball: Depending on pressure class and size, ensuring reliable sealing.
(4) Seat & Seals: Soft-seated (PTFE, PRTFE) for general service, or metal-seated for high temp/abrasive media.
(5) Fire-Safe & Anti-Static Design: Ensure safety in oil & gas and petrochemical applications.
(6) End Connections: Threaded, flanged, welded, or socket weld to match system requirements.
(7) ISO Mounting Pad: for easy actuator installation.

Applications;
(1) Oil & Gas Industry: Wellhead systems, pipelines, and production facilities.
(2) Petrochemical & Refinery: Handling hydrocarbons, corrosive fluids, and gases.
(3) Power Plants: Steam, cooling water, and fuel gas systems.
(4) Water Treatment & Utilities: Process water, wastewater, and desalination plants.
(5) Chemical Industry: Acids, solvents, and chemical transfer lines.
(6) General Industrial Systems: Compressed air, hydraulic circuits, and process automation.

Advantages;
(1) Tight shut-off with minimal leakage.
(2) Low operating torque with quarter-turn action.
(3) Versatile sealing options (soft or metal seats)
(4) Compact & robust design compared to gate/globe valves.
(5) Long service life with minimal maintenance.
(6) Fire-safe and anti-static options enhance safety.
(7) Easy automation (pneumatic/electric actuators).
(8) Cost-effective solution for both low-and high-pressure applications.

visit www.envelopeenergyltd.com
Email us at [email protected]

01/10/2025

The CV-150 Series is a Flanged Check Valve, bolted to mating flanged in a pipeline.

Designed & Design Features;
(1) ASTM A216 WCB carbon steel.
(2) Disc (or closure element) of stainless or corrosive-resistant materials (e.g. CF8M) for durability.
(3) Elastomeric or metal/graphite packing.
(4) Bonnet, hinge, pins, bolts, gaskets: constructed with corrosion and pressure resistant materials.
(5) Hinged disc (swings open under forward flow and closes under reverse flow).

Application;
(1) Oil & gas production, flowline and wellhead system (to prevent backflow).
(2) Instrumentation and pipeline system where a check valve is needed with a robust, flanged design, often under high pressure or corrosive environments.
(3) General industrial fluid system where reverse flow must be prevented.

Advantages;
(1) Because of its flanged and bolted construction, it can handle higher pressure and is serviceable (i.e. internal parts can be replaced by unbolting).
(2) Hinged-disc check valve has relatively low pressure drop in the forward flow direction.
(3) Durable materials (e.g. WCB, CF8M, corrosion resistant alloys) make it suitable for harsh environments.
(4) Standardization (i.e. "series") allows for predictable interchangeability industrial setup.

Visit www.envelopeenergyltd.com
Email us at [email protected]

29/09/2025

The MP6 Series Needle Valve is a high-pressure, multiport valve designed for precise flow control, isolation, and safety in instrumentation and process systems, particularly in oilfield operations, its compact design, durability, and versatility make it a preferred choice for wellhead maintenance, well intervention and well test operations

Functions;
(1) Flow Control (2) Isolation (3) Bleed/Drain (4) Switching / Multiport Flow Routing (5) Safety & Protection

Design features;
(1) High Pressure rating of 6000psi (2) Multiport Body; 3 to 4 ports (3) non-rotating stem tip (4) Packing Options; PTFE, graphite, or elastomer (5) Material; Carbon steel or stainless steel (316SS NACE-complaint) (6) Compact design (7) End connection; threaded NPT, compression fittings or flanged (8) Gate/Needle style mechanism.

Applications;
(1) Oil/gas Production systems (wellhead control panel, hydraulic control units, chemical injection skids, pressure and sampling lines) (2) Reservoir Evaluation & Testing (well testing manifolds, sampling & calibration lines) (3) Process Plant; Refining, Petrochemicals, Power (4) offshore & subsea support systems.

Advantages;
(1) High reliability in harsh conditions (2) Precision control (3) space & cost saving (4) flexibility (5) ease of maintenance (6) leak tight (7) compliance; available in API, NACE MR0175 & ISO.

visit www.envelopeenergyltd.com
email us at [email protected]

25/09/2025

An RX-type gasket is a pressure-energized ring joint gasket specifically designed for wellhead and high-pressure oilfield equipment applications.

Description;
1. The RX-type gasket is an octagonal-shaped pressure-energized ring gasket.
2. Designed to fit standard API 6B and 6BX flanges.
3. It is interchangeable with R-type octagonal gasket (same groove dimensions) but offer better sealing performance due to activation.

Design Features;
1. Pressure-energized - Internal pressure pushes the gasket into closer contact with the groove improving sealing.
2. Self-sealing - Even if bolt preload is reduced, the gasket maintains seal under pressure.
3. Standardized dimension per API 6A and ASME B16.20.
4. Made from soft iron, low carbon steel, stainless steel, Inconel or alloy depending on service requirements.
5. Suitable for up to 15,000psi working pressure (varies with material and size).

Application in wellheads;
1. Widely used in wellhead assemblies, Christmas trees, choke, BOP, and high-pressure condition.
2. Ensure leak-tight metal-to metal sealing in critical service (high pressure, high temperature, corrosive fluids).

Advantages;
1. Stronger seal than R-type gasket due to pressure-energization.
2. Interchangeable with R-type grooves, simplifying inventory.
3. Reliable for high-pressure oilfield operations.

ENVELOPE ENERGY, empowering sustainable solutions.
visit www.envelopeenergyltd.com
email us at [email protected]

24/09/2025

Intermediate Spool is a pressure-containing component used in oil and gas wellhead assemblies. It is installed between the casing head and the tubing head.

Functions;
1. Provides a transition spool between different wellhead components.
2. Supports and seals casing hanger of different sizes.
3. Houses test ports and outlets for monitoring pressure or injecting fluids.
4. Allows connection of blowout preventer (BOP) stack or other equipment during drilling and completion.
5. Ensure proper pressure isolation between casing strings.

Design Feature;
1. Bore size - Matches API standard casing/tubing programs.
2. Pressure Ratings - Typically rated from 2,000 psi up to 15,000 psi (API 6A).
3. End Connections - Flanged, studded, or clamp-hub type.
4. Outlets - Equipped with threaded or flanged outlets for kill lines, test ports, or gauges.
5. Sealing - Uses packoff or elastomeric/metal-to-metal seals to ensure isolation.
6. Versatility - May have multiple hanger landing profiles to accept casing hanger designs.

Applications;
1. Drilling operations where additional casing strings need suport.
2. Completion phase for installing tubing head above the spool.
3. Provides flexibility in well design by adapting between casing head and tubing head.
4. Critical in high-pressure well where multiple pressure barriers are needed.

Advantage;
1. Flexibility - Can accommodate different casing/tubing programs.
2. Safety - Maintains well control by isolating annuli.
3. Convenience - Provides outlets for pressure monitoring, testing, or injection.
4. Standardization - Conforms to API 6A standards for interchangeability and safety.

To contact us for quotes:
visit; www.envelopeenergyltd.com
email; [email protected]

23/09/2025

The ACV Series Adjustable Choke is designed with a stem and bean (or seat) arrangement that allows operators to adjust flow precisely by varying the choke opening. It can be operated manually or via an actuator for remote /automated control.

Functions;
1. Controls and regulates well production rates.
2. Maintains backpressure on the reservoir to optimize recovery.
3. Protects downstream equipment (separators, pipelines and processing facilities) from excessive flow or pressure.
4. Helps manage sand and debris flow in erosion service conditions.

Design Features;
1. Adjustable Trim - Allows manual or automated adjustment of the flow area.
2. Interchangeable Beans/Orifices - provides flexibility for different production needs.
3. High-Strength Materials - Built from alloys to withstand high pressure, temperature, and corrosive/erosive conditions (e.g., H2S, CO2 service).
4. Positive Sealing Stem & Bonnet - Ensures reliability and leak-tight operation.
5. Pressure Ratings - Designed for API 6A pressure classes (5,000-15,000 psi).
6. Connection Options - Flanged, threaded, or studded block ends.

Applications;
1. Oil/gas wellhead assemblies
2. Surface & subsea production manifolds.
3. Flowback & well testing operations.
4. Production rate control during reservoir management.
5. Protecting downstream processing facilities from surges.

Advantages;
1. Provides precise and flexible flow control compared to fixed chokes.
2. Easy maintenance with replaceable trim/bean inserts.
3. Suitable for both sweet & sour service conditions.
4. Available in manual or automated (hydraulic/electric actuated) models.
5. Rugged construction ensures long service life under erosive conditions.

To guarantee your asset flow control efficiency,
Visit www.envelopeenergyltd.com
email us at [email protected]

22/09/2025

The DLBV series butterfly valve is a quarter-turn valve that uses a circular disc as the closing element. When the disc is rotated by 90 degrees, the valve either fully open or closes. It is known for its compact design, lightweight body, and ease of installation compared to gate or globe valves.

Design Features;
1. Body Type - Wafer, lug, or double flanged options.
2. Disc - Streamlined for low torque and high flow efficiency.
3. Seat - Resilient or metal-seated for tight shutoff.
4. Operation - Level, gear operator, pneumatic, or electric actuator.
5. Pressure Rating - Typically ANSI Class 150/300 or PN10/16/25 depending on configuration.
6. Size Range - Wide range (commonly from 2" to 48" or larger for industrial applications.
7. Standards - Designed and tested per API, ASME, ISO, or EN standards.

Applications;
1. Oil & Gas pipeline (onshore/offshore).
2. Refining and petrochemical plants.
3. Water supply and wastewater treatment.
4. Power generation (cooling water systems).
5. Chemical and process industries.
6. HVAC and utility services.

Advantages;
1. Compact and lightweight compared to gate/globe valve.
2. Quick quarter-run operation for fast shutoff.
3. Cost-effective for large-diameter lines.
4. Low-pressure drop with streamline disc design.
5. Can be automated easily for remote control.

Visit www.envelopeenergyltd.com
email [email protected]

18/09/2025

The FS-GLV series gate valve is a slab gate or expanding gate valve designed for reliable isolation of flow in pipelines and wellhead systems. It provides a straight-through bore with minimal pressure drop and ensure positive shutoff under both low and high pressure conditions.

Design Feature;
1. Full Bore / Through Conduit Design - Allows unrestricted flow, minimizing turbulence and erosion.
2. Forged or Cast Body Construction - ensures strength and reliability under high pressures.
3. Metal-to-Metal or Soft Sealing Options - Adaptable to service requirements (oil, gas, water, corrosive media)
4. Rising or Non-Rising Stem - Depending on installation needs and space.
5. Bolted or Pressure Seal Bonnet - For easy maintenance and high-pressure integrity.
6. Replaceable Seat Bonnet - Extend valve life and make servicing economical.
7. Bidirectional Sealing - Seals effectively against pressure from either side.

Application;
1. Wellhead & Christmas tree assemblies.
2. Gathering, transmission, and distribution pipelines.
3. Refineries and petrochemical plants.
4. High pressure waterflood and CO2 injection systems.
5. General onshore & offshore oil and gas service.

Advantages;
1. Zero leakage shutoff with reliable sealing system.
2. Long service life due to wear-resistant materials and replaceable seats.
3. Low operating torque compared to other valve types.
4. API, ANSI, and NACE compatibility depending on manufacturer specifications.
5. Ease of maintenance due to simple internal construction.

At ENVELOPE ENERGY we provide our clients with the highest quality service.
www.envelopeenergyltd.com
[email protected]