Well intervention is defined as remedial operations that are performed on producing wells with the intention of restoring or increasing production. Well intervention in simple terms is a remedial operation that is performed on a well post drilling with the intention of restoring and improving production. One of the biggest challenges in well intervention is keeping costs down, rigorous and extensive preplanning is used to identify the best potential solutions while mitigating known and unknown risks.
Evolving Technology: An ESP (Electrical Submersible Pump) is an artificial lift method which consists of lowering a pump attached to the tubing string during well completion or workover. Now this can be safely performed rigless.
What are the Most Commonly Used Well Intervention Methodologies?
Interventions fall into two general categories: light or heavy. During light interventions, tools or sensors are lower into a live well while pressure is contained at the surface; in heavy interventions, a rig crew may stop production and kill the well before continuing with any intervention operation. The choice and success of techniques and equipment to perform an intervention may impact the economic success of a well and development.
- Light well interventions
Typically performed using slickline, wireline, or coiled tubing. These systems allow well remedial operators to minimize well and formation damage, in most cases are associated with a reduced well downtime and reservoir damage. Some coiled tubing operations, in particular the ones performed in small platforms or wellsites may be defined as medium well interventions due to the need for more complex logistic.
- Heavy well interventions
Also referred to as workovers—require the rig to remove the wellhead and other pressure barriers from the well to allow full access to the wellbore. Typically, heavy interventions are used to replace parts such as tubing strings and pumps that cannot be retrieved through light interventions.
What are Rigless and Thru-Tubing Operations?
Rigless well interventions are cost-effective well intervention operations conducted with equipment and facilities that precludes the requirement for a rig over the wellbore. Coiled tubing, slickline, electric line (e-line), braided line and snubbing activities are commonly conducted as rigless operations.
Through tubing is the most common well intervention operation, widely and economically applied method in enhancing producing oil and gas wells. Through-tubing enables recompletion, stimulation or repair work to be done inside a flowing oil or gas production well.
Rigless operations drastically reduce well downtime cost and time at a fraction of a conventional heavy well intervention. As rigless solution evolve, costly conventional methods of operation are being phased out and E&P Operators will seek new cost saving techniques.
A New Approach for Deploying and Changing-Out ESPs
Wireline Retrievable ESP (WRESP) is a step change in ESP deployment, the ESP is retrieved and reinstalled with a wireline method (as a rigless job) at any time of ESP life cycle and in a live well. This will provide important savings in intervention costs, much improved well uptime, while protecting the reservoir from well damage since this operation does not require to kill the well. An important contrast compared with most of the operations in offshore oil and gas fields where they need to hire rigs, with intervention costs exceeding several million dollars.
At AccessESP we partner with our Customers to analyze and deploy innovative ESP technologies to increase your uptime. Contact us today to learn more about what we are accomplishing and what we are offering.