Workover Rig
Core equipment directly determines the operation capacity, stability and safety of the workover rig, and is the core competitiveness of the workover rig, mainly including : Winch: The core of the hoisting system, responsible for providing traction and lifting downhole pipe strings and tools. It is divided into mechanical winch and hydraulic winch. High-pressure and large-load models adopt hydraulic winch with stronger stability. Derrick: Supports the hoisting system and bears the full load of workover operations. It is divided into tower derrick and A-type derrick. Desert and alpine models adopt high-strength alloy derrick with wind and low-temperature resistance. Mud Pump: The core of the circulation system, providing power for mud circulation. It is divided into single-cylinder, double-cylinder and triple-cylinder mud pumps. High-pressure workover rigs are equipped with triple-cylinder high-pressure mud pumps with pressure up to 35MPa or more. Blowout Preventer Set: The core of the well control system, divided into annular blowout preventer and ram blowout preventer. High-pressure and sulfur-resistant models adopt sulfur-resistant blowout preventers, adapting to the working conditions of sulfur-containing oil and gas fields in the Middle East and Russia. Digital Control System: The core of the automated workover rig, including PLC control system and touch screen operation interface, which can realize real-time monitoring of operation parameters and remote control, improving operation accuracy and efficiency.
The core technologies of the workover rig are concentrated in the fields of power control, well control safety and environmental adaptation, which directly affect the adaptability and operation safety of the equipment, mainly including: High-pressure Bearing Technology: Adopting high-strength alloy materials and precision processing technology to improve the pressure-bearing capacity of winch, derrick and mud pump, adapting to the workover needs of high-pressure oil and gas wells in the Middle East, complying with API 6A standard. Low-temperature Adaptation Technology: Adopting special low-temperature lubricating oil, seals and electrical components, optimizing the equipment structure, ensuring that the equipment can start and operate stably in the extremely cold environment of -45℃, adapting to the alpine working conditions in Russia. Sand and Dust Prevention Technology: Optimizing the equipment sealing structure, adopting dust covers, filters and other components to prevent sand particles from entering the equipment, reducing wear and adapting to the sandy working conditions in the Middle East desert. Automated Control Technology: Integrating PLC, sensors and remote transmission modules to realize automatic control, parameter monitoring and fault early warning of workover operations, reducing manual intervention and improving operation efficiency and safety. Sulfur and Corrosion Resistance Technology: Adopting sulfur-resistant alloy materials and anti-corrosion treatment for key equipment components to prevent sulfur-containing media from corroding the equipment, adapting to the operation of sulfur-containing oil and gas fields in the Middle East and Russia.
Product Introduction
Workover Rig, also known as well-servicing rig, is the core power equipment in oil and gas well workover and downhole operation construction. It is mainly used for fault maintenance, production capacity recovery and various downhole operations of oil, gas and water wells. It can complete tasks such as pipe rod lifting, sand washing and paraffin removal, plug drilling and sidetracking, and circulating kill well. It is widely used in oil and gas producing areas such as the Middle East, Russia and Tanzania, and is a key equipment to ensure the stable production of oil and gas fields.
Types and Characteristics of Equipment
Type
Workover rigs can be divided into various types according to walking chassis, operation conditions, power forms and other dimensions. Different models are suitable for different scenarios with distinct characteristics. The core classification and characteristics are as follows
Features
Characteristics: The main engine is integrated into a special automobile chassis, with self-propelled function, convenient movement, high relocation efficiency and strong off-road performance. It can adapt to highways and simple oilfield roads, and is the most widely used, suitable for most land scenarios such as Middle East deserts and Tanzania shallow oil and gas fields. Characteristics: The main engine is separated from the chassis and needs to be transported by a traction vehicle. It has stable structure and strong bearing capacity, suitable for open well sites such as plains and deserts, and adapted to large-scale workover operations in large Middle East oil and gas fields. Characteristics: Adopting crawler chassis, it has extremely strong off-road performance, no need for special roads, and can drive in complex terrains such as muddy, swampy and Gobi areas. It is mostly used as a well-servicing rig, suitable for Tanzania mine supporting and Russia Siberia swamp areas. Characteristics: Self-propelled chassis design, on-board power can meet both driving and workover needs, hydraulic lifting derrick, fast relocation, convenient operation and strong passability, suitable for various land workover scenarios. Characteristics: Equipped with digital driller's room and wellhead automation device, realizing centralized control and visual operation, reducing labor intensity, improving efficiency, with intelligence and energy-saving characteristics, suitable for high-end oil and gas fields in the Middle East and Russia.
Workover Rig
A workover rig is specialized mobile equipment used to repair, maintain, and rework existing oil and gas wells.
Workover Rig
It performs operations such as pulling tubing, replacing pumps, cleaning wells, and restoring well production efficiency.
Workover Rig
Basic Principles and System Composition
Basic Working Principle
The core principle of the workover rig is to provide power through the power system to drive the winch to operate, and realize the lifting operation of downhole pipe strings and tools with the help of derrick, traveling block, hook and other components; at the same time, through the circulation system and well control system, cooperate with workover tools to complete operations such as sand washing, paraffin removal and kill well. The core is to convert power into traction and operation force for downhole operations, ensuring the safe and efficient development of workover operations.
Overall System Composition
The workover rig system is composed of five core parts: power system, hoisting system, circulation system, well control system and operation system. All systems work together to ensure the stable operation of the equipment, as follows (Chinese-English comparison): Power System: The core is a diesel engine or electric motor, providing power required for equipment operation, winch operation and derrick lifting. Some high-end models are equipped with dual power (diesel + electric) to adapt to different operation scenarios. Hoisting System: Including winch, derrick, traveling block, hook, steel wire rope, etc., it is the core operation system of the workover rig, responsible for lifting and hanging downhole pipe strings and tools, and bearing the main load of workover operations. Circulation System: Composed of mud pump, mud tank, pipeline, filter, etc., it is responsible for circulating mud, cooling downhole tools, carrying sand particles, and ensuring the continuity of workover operations. Well Control System: Including blowout preventer set, choke manifold, kill manifold, etc., its core function is to prevent downhole oil and gas overflow, respond to abnormal situations such as kick and blowout, ensure operation safety, and high-pressure and low-temperature models need to strengthen well control performance. Operation System: Divided into manual operation and automatic operation, including driller's console, hydraulic control system and electrical control system, responsible for controlling the coordinated operation of various systems of the equipment to realize the precise execution of workover tasks.
Basic Principles and System Composition
Operation Preparation：Inspect the integrity and performance of each system of the workover rig (power, hoisting, circulation, well control), clean the well site, level the ground, and place workover tools and auxiliary equipment; connect pipelines, debug equipment parameters to ensure no equipment failure or leakage; conduct safety training for operators to clarify the operation process and safety precautions. Equipment Positioning & Commissioning： Move the workover rig to the wellhead position, align with the wellhead center, fix the chassis and lift the derrick to ensure the derrick is vertical and stable; connect the mud circulation system and well control system, debug the operation parameters of the winch and mud pump, test the sealing performance of the blowout preventer, and ensure all equipment operates normally. Downhole Operation Implementation：According to the workover task (pump inspection, sand washing, paraffin removal, etc.), lift the downhole pipe string and workover tools through the hoisting system; start the circulation system, circulate the mud, and carry downhole sand particles, wax and other impurities to the ground; monitor the operation parameters (pressure, speed, mud flow) throughout the process, adjust the equipment operation status in time, and respond to abnormal situations. Operation Finishing： After completing the workover task, stop the equipment operation, close the mud circulation system and well control system, lift out the downhole tools and pipe strings, and clean the wellhead and well site; inspect the wear of each equipment component, perform cleaning, lubrication and maintenance, and move the equipment to the designated position for storage; sort out the operation data and fill in the operation report.
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