Oil and gas operators agree that WRESP (Wireline Retrievable ESP) provides an innovative system with unique features that support lowering OPEX and increasing well uptime and recoverable reserves.
There are many reasons a well intervention may be required when operating an ESP lifted well. Each ESP intervention (conventional or alternative deployment) has an associated workover cost of pulling and replacing the hardware/completion in the well (this includes well intervention and associated costs) and well downtime, which presents production losses while the well is awaiting the replacement.
A WRESP operation can provide significant cost savings and economic benefits. However, the various WRESP market offerings differ in concept, application range and features, which you should consider before making a long-term decision.
What Features Should You Look for When Considering a WRESP?
The most important factor is understanding the economic impact of well intervention costs and well downtime. Some considerations
- Rapid ESP changeout on a live well with standard slickline/wireline minimizes deferred production.
- ESP provides full access to the lower completion for a well workover, without the need to pull the tubing.
- WRESP can provide a wide range of applications, from 7” caning and up (7” casing with flow ranges up to ESP series 400 pumps).
Live Well, Rapid and Cost-effective ESP Changeout
WRESP objective always included a through-tubing deployment concept on a rapid, cost-effective ESP changeout.
OFS companies took two main different directions:
- Conventional slickline or wireline: Slickline or wireline are generally available in most oilfield operations, a preferred deployment option even for high well deviations. Two key variations in this option: (a) deploying the ESP in sections, being the most versatile fully enabling live rigless “compact” operations; or (b) ESP deployed all in one section, with potential limitations on height and weight for standard wireline and WHE deployment, requiring at times different well completion design like larger tubing or more complex well completions.
- ESP suspended at the end of the power cable: ESP suspended at the end of the power cable, two variations of the same concept. Both offer a fit for purpose power cable that vary in construction and robustness (both with depth limitations similar to coiled tubing). These require a bulkier / larger surface deployment system; some solutions offering higher rotating motors and ESPs (to lower length and weight, mitigating this limitation); other offering a more robust cable encapsulation concept for better environmental protection. Some applications require a special well completion consideration to comply with well barriers policy.
Full access to lower completion for well workover, without the need of pulling the tubing: Having access to the lower completion without the need of pulling the tubing is a significant new benefit from WRESP applications, in particular when you have full bore that enables the running of most logging tools, perforating guns, bridge plugs, coiled tubing, and others including stimulation.
Wide range of applications, from 7” caning and up, 4 1/2” tubing and up: deploying WRESP technology in wells with 7” or larger casing size or tubing sizes of 4 1/2” open a significant number of opportunities to apply WRESP technology. Many WRESP applications are in 7” casing, often lifted with ESP pump 400 Series pumps with OD reduced to 3.80” (for 4 1/2″ tubing, also compliant with safety valves ID).
Today, you can deploy rigless ESP technology on a live well with 7” casing, ESP thru tubing 4 1/2″ and production rates of up to 7,000 bfpd, and up to 400HP of power – and you can have full and uninterrupted access to the lower completion when the ESP is pulled from the well.
AccessESP is the only technology that offers these key features with demonstrated success for our customers’ operations. Contact us today to learn more about how you can reduce downtime and associated costs for your next project.