Workover Rigs 350

A workover rig is a specialized drilling rig used in the oil and gas industry for performing workover operations on existing wells. Workover operations refer to a range of maintenance, repair, and remedial activities conducted to optimize or restore the productivity of a well.

Workover rigs are designed to handle various tasks, including:

– Well intervention. Workover rigs are used to access the wellbore for interventions such as removing debris or scale, cleaning out sand or other obstructions, or repairing damaged or malfunctioning downhole equipment.

– Completion changes. Workover rigs are employed to make changes or modifications to the well completion, which involves altering the configuration of the casing, tubing, and production equipment. This allows for adjustments to production zones, installation of new equipment, or optimizing the flow of fluids.

– Stimulation and enhancement. Workover rigs are utilized to stimulate the production of hydrocarbons by performing operations such as acidizing, fracturing, or re-perforating the reservoir. These techniques help increase the permeability of the formation and improve the flow of oil or gas into the wellbore.

– Plugging and abandonment. Workover rigs are involved in plugging and abandoning wells that have reached the end of their productive life or are no longer economically viable. This process requires the proper sealing and isolation of the well to prevent any potential environmental or safety risks.

Workover rigs are typically smaller and more mobile compared to drilling rigs. They can be truck-mounted, skid-mounted, or trailer-mounted, allowing for easier transportation between well locations. Workover crews, consisting of skilled operators and technicians, operate these rigs and perform the necessary tasks under the supervision of a wellsite supervisor.

Workover operations are conducted to maintain or enhance the productivity of existing wells, extend their lifespan, and maximize recovery from reservoirs. They play a vital role in the overall lifecycle management of oil and gas wells, ensuring optimal production and efficiency while minimizing downtime and costly interventions.

According to its operating structure, it can be divided into two types: tracked and tire-type.

Crawler-type workover rigs are generally not equipped with derricks, and their power off-road performance is good, making them suitable for construction in low-lying muddy areas. Crawler type workover rigs are generally referred to as drilling rigs, but they are actually a type of self-propelled crawler tractor modified with added roller. The wheeled workover rig is generally equipped with a self-back derrick, which has fast walking speed and high construction efficiency, and is suitable for the need of rapid relocation. However, it is relatively limited to travel and enter the well site in low-lying muddy areas, rainy seasons, and mud pumping seasons.  

At the same time, wokrover rigs have the following types:

1、 Classified by walking chassis: vehicle mounted, self-propelled.

2、 Classified by power: single engine (referencing chassis power source), dual engine (with an additional engine installed on the platform as the power source), electric (with an electric motor installed on the platform), dual power (with an engine and electric motor installed on the platform)

3、 Classification by Derrick Type: Single section Derrick, Double section Derrick

4、 Classified by function: workover rig, dual purpose drilling and workover rig, desert workover rig, mudflat workover rig, inclined well workover rig, blowout prevention workover rig

5、 Classified by structural type: double drum workover rig, non tensioned workover rig, non pressurized workover rig

6、 Divided by load increase: 20t, 30t, 40t, 80t, 100t, 120t, 150t, 180t, 225t