New and evolving technologies are drastically changing the way companies install and replace ESPs in a well. You can now install and replace thru-tubing and a rigless system, a paradigm shift from deployment.
For about 100 years , companies have installed ESPs fully attached to the production tubing, using a rig or pulling unit (a heavy workover). Unfortunately, almost all, tubing-run ESPs haven been operated on a run-to-failure mode because it’s more economical. Also, fields that could have had more productivity and recovery with ESPs are being produced with gas lift support since intervention costs and deferred production made ESPs economically unavailable.
What are the different methods for Rigless pump changes?
Rigless ESP deployment methodologies, also called ESP alternative deployment techniques, include the following.
- WRESP: A wireline retrievable ESP is where the ESP (gauge, motor, seal, intake, gas handler, pump and discharge) is installed or retrieved from the well thru-tubing, using a conventional slickline (or braided line) operation. The ESP cable is run as per a standard ESP, attached at the exterior of the tubing, ending downhole on a tubing run dock or connector.
- Wireline Deployed Pump: Thru-tubing deployed ESP is installed with a pump-on slickline (or braided line) where the ESP motor, seal and cable are run with the tubing string as with any conventional ESP deployment. Changing an ESP motor requires a heavy workover intervention.
- Coiled Tubing Deployed ESP: This is an inverted ESP deployed thru-tubing hanging from a coiled tubing with the power cable inside the CT. The ESP can be installed and retrieved from the well without pulling the tubing string. However, it requires a larger modification to the wellhead and, CT equivalent equipment every time the ESP needs to be changed.
- Cable Deployed ESP: This is an inverted ESP deployed thru-tubing and suspended from surface on a special ESP power cable. It also requires a modification to the wellhead, and a larger wireline unit for deployment or retrieval from well
What to look for when selecting a Rigless ESP Deployment System?
Ultimately, the decision should come from your economic analysis. Your selection of a rigless ESP deployment system will be based on what well production you can achieve with your capital expenditure requirements and operating expenditure savings.
AccessESP is the only company in the market that can offer a large benefit for the investment, thanks to the fact that you can safely and efficiently install the ESP by a standard slickline operation (readily available everywhere) on a live well. This allows changeout at a fraction of cost of rigless ESP systems and also provides the possibility of having unrestricted access to the lower completion and reservoir for well maintenance, reperforating, setting plugs and other tasks.
Furthermore, AccessESP offers a further economic benefit of implementing a maintenance program avoiding the costs of running an ESP to failure (and the associated nonproductive time).