Устройство защиты при извлечении нефтяных скважин LYFH-165/21
Main Protective Housing
The core load-bearing, anti-theft and protective shell of the device, serving as the basic structure of the whole equipment.
165mm Connection Flange Assembly
Standard docking with wellhead casing head to ensure installation strength, sealing and centering.
Mechanical Anti-theft Locking Mechanism
Including locking blocks, claws and driving mandrel, realizing anti-dismantling, anti-pry and anti-theft functions.
High-pressure Sealing Assembly
Self-tightening seals suitable for 21MPa working pressure to prevent oil and gas leakage.
Special Opening Lock Cylinder Mechanism
Can only be driven and unlocked by special tools, serving as the key component for anti-theft function.
Safety Pressure Relief Device
Used for pressure release under abnormal working conditions to improve the safety and reliability of the wellhead.
Special Anti-theft Locking Technology
Adopts a mechanical anti-dismantling locking structure driven by matching special tools. It cannot be opened or disassembled without special tools, realizing wellhead anti-theft and anti-vandalism protection.
21MPa High-pressure Self-tightening Sealing Technology
Adopts metal + rubber composite sealing. The sealing surface is automatically compressed under well pressure, meeting the zero-leakage sealing requirement under high-pressure working conditions.
Standardized Flange Connection Technology
Adopts 165mm standard wellhead flange, which is universally connected with casing heads and Christmas trees. It is easy to install, has strong interchangeability and high field adaptability.
Safety Pressure Relief & Control Technology
Built-in pressure relief passage / pressure relief structure, which can automatically release pressure under abnormal high pressure, prevent pressure buildup and leakage, and improve well control safety.
Anti-theft & Operation Compatible Technology
Provides full protection in the locked state. After unlocking, it quickly gives way to the wellhead channel without affecting normal operations such as oil fishing, paraffin removal and inspection.
Long-term Anti-corrosion Technology for Field Application
The main body is made of high-strength carbon steel with surface anti-corrosion treatment. It is resistant to wind, sand, rain, snow and corrosion, suitable for long-term unattended field environments.
Product Introduction
Flange Connection Type
Model: LYFH‑165/21
Name: Oil Well Fishing Protection Device
LYFH: L‑Lao (Fishing), Y‑You (Oil), F‑Fang (Protection), H‑Hu (Housing)
165: Nominal diameter 165 mm (suitable for wellhead flange)
21: Rated working pressure 21 MPa
Integrated steel protective housing + flange connection base + anti-theft locking mechanism
Connection type: Standard flange connection (direct butt joint with Christmas tree / wellhead casing head)
Made of 35CrMo chromium-molybdenum alloy structural steel, featuring high strength, high fatigue strength, excellent toughness and good low-temperature impact resistance. It also has heat resistance and wear resistance, is suitable for quenching and tempering treatment, and boasts stable and reliable comprehensive mechanical properties.
Types and Characteristics of Equipment
Type
Anti-theft Protection Type (Main Type)
LYFH-165/21 falls into this category. Equipped with special lock cylinder and anti-dismantling structure, it is anti-pry, anti-theft and anti-vandalism.
Application: Marginal wells, low-production wells, abandoned wells, remote wells.
Safety Protection Type (Well Control)
Built-in pressure relief valve and sealing assembly, providing blowout prevention, leakage prevention and misoperation prevention.
Compatible with Oil Fishing Operation Type
Can be opened with special tools without affecting the normal operation of oil fishing trucks.
Features
Special Anti-theft Structure:
Equipped with a special tool opening mechanism. It cannot be disassembled without a dedicated key, providing anti-pry, anti-theft and anti-vandalism protection. Suitable for remote wells, low-production wells and oil fishing wells.
High Pressure Safety & Reliability:
Rated working pressure of 21 MPa, with strong pressure-bearing capacity, meeting the safety protection requirements of medium and high-pressure oil fishing wells.
Strong Adaptability:
Standard 165 mm flange connection, highly compatible with wellheads, casings and oil fishing operation equipment, enabling convenient installation and good universality.
Protection & Operation Compatibility:
Provides fully enclosed protection in the locked state. After unlocking, it does not affect normal oil fishing, paraffin removal, inspection and other operations.
Excellent Sealing Performance:
Adopts a composite sealing structure with reliable pressure-resistant sealing, effectively preventing oil and gas leakage and well fluid overflow.
Sturdy, Durable & Corrosion Resistant:
The main body is made of alloy steel / carbon steel with anti-corrosion surface treatment, adapting to field environments including wind, sand, rain, snow and corrosion.
Built-in Safety Protection Functions:
Features anti-misopening, anti-dismantling and anti-accidental operation functions, improving the overall safety level of the wellhead.
Compact Structure & Easy Maintenance:
Small overall size, moderate weight, simple daily maintenance, long service life and reduced management costs.
Oil Well Fishing Protection Device LYFH-16521
LYFH-165/21 is a wellhead protection device for oil pumping wells, featuring anti-theft and high-pressure sealing.
Oil Well Fishing Protection Device LYFH-16521
It adopts special tool unlocking and mechanical locking structure, suitable for remote and low-production wells.
Oil Well Fishing Protection Device LYFH-16521
With standard 165mm flange connection, it ensures safe operation and long service life in oilfields.
Basic Principles and System Composition
Basic Working Principle
This device focuses on mechanical locking, pressure‑bearing sealing and safety pressure relief. It automatically switches between wellhead closed protection and oil fishing operation to realize anti‑theft, blowout prevention and vandalism resistance.
Locking & Protection Principle
Driven by a special tool, the lock cylinder drives the internal anti‑dismantling claws/locking blocks to form radial/axial mechanical locking with the wellhead flange. Without the special tool, disassembly and prying are impossible, achieving anti‑theft, vandalism resistance and misoperation prevention.
Sealing & Pressure‑bearing Principle
The mating surface between the device and the wellhead flange adopts metal‑rubber composite sealing. Under well pressure, the seal is automatically compressed, bearing a maximum pressure of 21 MPa to prevent oil‑gas leakage and blowout.
Oil Fishing Operation Switching Principle
After unlocking with the special tool, the protective main body can be quickly opened or rotated aside to expose the wellhead, without affecting the running of oil fishing equipment and normal pumping operations. After operation, it is reset and locked again.
Safety Pressure Relief Principle
Built‑in pressure relief passage/valve allows automatic or manual pressure relief when downhole pressure rises abnormally, avoiding pressure‑induced leakage or rupture and ensuring wellhead and personnel safety.
Overall System Composition
This device is an integrated wellhead protection system, composed of five functional modules: mechanical locking, pressure‑bearing sealing, anti‑theft opening, safety pressure relief, and connection & fixing. The main components are as follows:
Main Protective Housing
The core load‑bearing component of the device, which fully encloses the wellhead and provides the structural basis for external protection, impact resistance and vandalism prevention.
Flange Connection Assembly
Standard 165 mm flange structure, used for bolting and centering with the wellhead casing head / Christmas tree to ensure stable installation.
Mechanical Locking Mechanism
Includes locking blocks, claws, driving mandrel, etc. Driven by a special tool to achieve axial / radial locking; non‑disassemblable without the special tool, realizing anti‑theft and anti‑dismantling.
Sealing Assembly
Adopts a metal ring gasket + rubber composite sealing structure, with self‑tightening sealing under well pressure, meeting the 21 MPa pressure‑bearing and leakage‑prevention requirement.
Special Anti‑theft Opening Mechanism
Includes lock cylinder, driving interface and limiting structure. Only matching special tools can open it, preventing unauthorized disassembly and random operation.
Safety Pressure Relief Structure
Built‑in pressure relief passage / relief valve, used for abnormal pressure release to prevent pressure buildup and leakage, improving well control safety.
Anti‑corrosion Protection Accessories
Include dust caps, anti‑corrosion coatings, fasteners, etc., extending the service life under harsh field environments.
Basic Principles and System Composition
Installation Procedure
Clean the sealing surface of the wellhead flange to ensure no debris or damage. Hoist and align the protection device with the 165 mm wellhead flange. Tighten the connecting bolts evenly to ensure firm installation and reliable sealing. Check the locking mechanism and pressure relief device to confirm normal operation.Opening Procedure Before Oil Fishing Operation
The operator uses a special unlocking tool to align with the device opening interface. Rotate the tool in the specified direction to release the internal mechanical lock. Open the main body of the protection device to expose the wellhead operation channel. After confirming the channel is clear and normal, run in the oil fishing equipment and start operation.Closing & Locking Procedure After Oil Fishing Operation
Pull out the oil fishing equipment and clean the wellhead and device sealing surfaces. Reset the protection device and fasten it in place. Relock using the special tool and confirm effective locking. Check for no leakage and looseness to complete wellhead protection.Abnormal Pressure Safety Relief Procedure
When the downhole pressure rises abnormally, the built-in pressure relief structure of the device activates automatically. Release pressure slowly to prevent pressure buildup, leakage and splashing. After the pressure returns to normal, check the device status and restore protection.Routine Inspection Procedure
Check the flange bolts, housing and lock cylinder for looseness or damage.
Inspect the sealing parts for leakage and the pressure relief mechanism for proper function.
Confirm reliable protection locking and complete the inspection record.
Многоязычная поддержка
Многоязычная профессиональная поддержка в сфере внешней торговли
Комплексные логистические услуги
Полный спектр логистических услуг, включая таможенное оформление и организацию доставки.
Полный комплект экспортной документации
Полный комплект экспортной документации: протоколы инспекции и т.д.
Превосходная своевременная доставка
Гарантированная своевременная доставка благодаря эффективному управлению производством и логистикой.
Послепродажное обслуживание и техническая поддержка
Своевременное послепродажное и техническое обслуживание зарубежных клиентов.