ACP – Annular Connection Port

ACP draws fluid through a perforated intake into the tubing string from the annulus (like a conventional ESP). With this system the annulus around the ACP is exposed to production fluids (live annulus).

Artificial Lift

When the natural reservoir energy is not enough to produce a well to its optimal inflow performance, an artificial lift system is installed inside the well to help “lifting” – producing the fluid to surface, recovering the desired well productivity. Artificial Lift typically involves either using a downhole pump to provide this additional lift energy or injecting gas into the producing fluid column to reduce its hydrostatic pressure, thus optimizing well productivity.

Corrective Maintenance

Corrective maintenance is a maintenance task performed to identify, isolate, and rectify a fault so that the failed equipment, machine, or system can be restored to an operational condition within the tolerances or limits established for in-service operations. Simplified, corrective maintenance focuses on diagnosing and fixing broken assets..

ESP (Electric Submersible Pump)

An artificial lift method that uses a downhole multi-stage centrifugal pump driven by an electric motor.

Four-runs, AccessESP Deployment

AccessESP slickline retrievable ESP assembly is installed in four runs, allowing the operator flexibility, minimizing run lengths to allow for standard live well intervention


  • Run one — The wet-connect, DH Gauge and motor assembly and mechanical coupling to transfer torque and rotation to the pump.
  • Run two — The matting mechanical coupling, pump intake, gas handler and pump.
  • Run three — pack-off / seal off the system against the tubing and avoids recirculation during operation.
  • Run four — The tubing stop locks the retrievable system in place


Flowback Services

Flowback is a temporary post well completion process in which drilling and completion fluids remaining in the wellbore and formation are recovered to the surface by natural flow or assisted by a lifting methodology, with the objective of leaving the well ready for hydrocarbon production.

The industry uses different methodologies to perform well flowback, like jet pump, Nitrogen lifting and coiled tubing, etc.

AccessESP technology provides a very efficient solution for well flowback for wells that will later be equipped with a lifting system or even for wells that will be initially be put in production by natural flow. This is thanks to AccessESP unique feature that allows the ESP to be retrieved from the well once the flowback is completed, leaving the well with full thru-bore access.

Gas Lift (GL)

An artificial lift method in which gas is injected into the production tubing to reduce the hydrostatic pressure of the fluid column. Typically, gas is injected down the tubing-casing annular space entering the production tubing through gas-lift valves at design specific depths, operating pressures and injection rates according with well conditions.

ICP - In-Line Connection Port

ICP draws fluid from below and does not expose the annulus to produced fluids (dead annulus). With the ICP all production fluids (including gas) must pass through the pump. This is configuration is an ACP with an integral ‘shroud’.

Lifecycle Cost

Hydrocarbon field development and production includes key considerations about how to produce a particular field in the most effective and economic way. Apart from CAPEX, Production and OPEX have an important impact on determining a field development lifecycle, its recoverable reserves and economic viability.

Light Workover Well Intervention

To maintain or extend the economic life of a well, different work is performed during the life of an oil and gas well to maintain, repair or bring the well back in production. Well interventions fall into two major categories, light and heavy.

Light Workover Well Interventions are performed by lowering tools or equipment into the well, often on a live well, using slickline, wireline or coiled tubing. These are cost effective solutions performed on a quick turnaround time improving well production uptime, safer and environmentally more efficient.

Live Well Intervention

An intervention performed without the need to kill a well. AccessESP technology allows an ESP changeout on a live well, the ESP is pulled and replaced with a standard slickline, wireline or coiled tubing operation.

Permanent Completion (Dock)

Run with the tubing, AccessESP Permanent Completion (Dock) is the ‘landing string’ for the Retrievable Assembly (ESP system). It includes the male wet connector, the orientation system to align the male and female wet connectors. The Permanent Completion (Dock) also provides the connection point to the ESP power cable, which runs to the surface on the outside of tubing (like a conventional ESP installation).

AccessESP provides two types of Permanent Completions, ACP (Annular Connection Port) and ICP (In-Line Connection Port). The selection of ACP/ICP depends on the completion configuration, barriers, gas production rates, etc. The two systems are functionally identical, the only difference is the location/configuration of the pump intake.

Pump-only Replacement

AccessESP system allows for a pump-only replacement, in particular when pump wears due to abrasives or pump plugging, the system flexibility allows to replace the pump thru-tubing without the need for pulling the ESP motor.

Preventative Maintenance

Preventive maintenance (or preventative maintenance) is work that is performed regularly (on a scheduled basis) in order to minimize the chance that a certain piece of equipment will fail and cause costly unscheduled downtime. Preventative maintenance is hence performed while the equipment is still in working condition.

Retrievable Assembly

The ESP with its wet connector that is deployed thru-tubing once the well has been complete and ready for ESP, installed in four slickline runs.

Rigless ESP

An alternative deployment technique for deploying and replacing ESP systems with a thru-tubing operation without a need for having a rig – using slickline or wireline, and for more complex and highly deviated operations using coiled tubing or well tractors. This operation significantly reduces OPEX (Operating Costs) while improving well uptime – hence production.

Rigless Operation

A well-intervention operation conducted with equipment that precludes the requirement for a rig over the wellbore. Slickline, Wireline, Coiled tubing, and snubbing activities are commonly conducted as Rigless operations.

Side Pocket Mounted Wet Connector

The male wet connector of the AccessESP system is mounted in a ‘side pocket’, outside the main tubing bore. This design provides a number of advantages:

  • Full-bore access: The main tubing bore is not blocked. For 4 ½” tubing and Access375 system the minimum ID through the system is 3.7” when the ESP is pulled from the well, allowing unimpeded access to the lower completion and reservoir for workovers, re-entry, logging and other intervention/remediation.
  • Debris Management: The offset position of the connector makes the system far less susceptible to debris, a unique AccessESP feature.
  • Isolation Sleeve: an isolation sleeve that provides a Permanent Completion protection when the ESP is out of the well, providing also full pressure integrity with a 3.0” through bore for well intervention, also allowing for the Permanent Completion to be installed early on during well completion, and the Retrievable Assembly be installed months or years later, when ESP lift is required.


Slickline (sometimes called “piano wire”) is a single-strand nonelectric cable  used for installing, retrieving or adjusting hardware at the wellbore, such as gauges, valves, flow control, plugs and also to perform thru-tubing operations such as AccessESP ESP changeout, thru-tubing perforating, tubulars and well repairs and others. Wrapped around a drum on the back of a skid mounted unit or truck, the slickline is deployed in and out safely on a live well thanks to the use of slickline standard WHE – Well Head Equipment equipped with a stuffing-box.


Operations are performed in wells to carry out a variety of activities, ranging from well performance enhancements, well stimulation, isolation, mechanical work or fishing, and others.

Thru-tubing Conveyed ESP

AccessESP thru tubing ESP deployment system is the best and unique industry solution for installing an ESP that provides full tubing bore access when the ESP is removed from the well. AccessESP operations are carried out on live wells and generally on a slick line standard operation.

Tubing Pack-off (alternative packoff)

A Tubing Pack-off is typically utilized to provide hydraulic isolation in the tubing string, an elastomeric sealing element, to prevent fluid in tubing – ESP pump interface recirculation

Tubing Stop

AccessESP thru-tubing Retrievable Assembly installation uses in its standard configuration an industry commercially available Tubing Stop as a means of securing the Downhole Retrievable Assembly in place, while preventing any unwanted movement out of the well, in particular in high-deviation or horizontal installations.

A Tubing Stop is typically utilized to provide a platform to land various subsurface tools on, or to prevent any unwanted tools or other object from travelling down or up the production tubing or wellbore.

Well Stock

A portfolio or group of wells for which the well Operator has operating or responsibility.

Well Tractor

A Well Tractor is a wireline-deployed, self-propelled tool to assist the conveyance of equipment in and out of wells. This technology was developed to greatly improve well intervention operations in high-angle and horizontal oil and gas wells. Downhole well tractors are a safer and cost effective solution that expand the way well interventions are executed, reducing well intervention hardware and footprint needs, while also reducing safety and environmental exposures.

Well Tractors are an important enabler for AccessESP technology, supporting the thru-tubing deployment of ESPs in highly-angle and horizontal wells, and specifically when operating on small platforms or rig sites.

Well Uptime

A measure of a well effective operation, expressed as the percentage of time a well has been producing. Achieving optimal production from any asset is one of the most important objectives of an E&P Company.


An industry term applied inconsistently, since in cases is associated to electric logging, and others with slickline operations. Wireline term describes equipment used in well-intervention operations conducted using single-strand or multistrand wire or cable for intervention in oil or gas wells. Similarly, the term slickline is also commonly used to differentiate operations performed with single-strand wire or braided lines.

Wireline Retrievable ESP (WRESP)

Wireline Retrievable ESP (WRESP) is a step change in ESP deployment methodology. An ESP – Electric Submersible Pump can be retrieved and reinstalled thru-tubing anytime  a Rigless operation without pulling the well completion / tubing, using standard slickline (AccessESP methodology), and for well deviations larger than 65 deg with Coiled Tubing or well tractor support.

A Wireline Retrievable ESP system consists in general of two main parts:

  1. A Permanent Completion Dock (or Docking Station) with an electric connector, run with the well completion and tubing string with the power cable at the outside of the tubing as per any conventional ESP installation.
  2. A Retrievable Assembly, thru-tubing, carrying the mating electric connector, the ESP string (gauge, motor, seal / protector, intake and gas handling device, pump and discharge) with a seal assembly and a tubing stop.

Benefits of AccessESP WRESP system is the possibility of changing out the retrievable ESP on a live well, and have full bore access to the lower completion when the Retrievable Assembly is removed from the well.

Wireline Pressure Control Equipment

Pressure control equipment and accessories for slickline and braided cable operations. Typical well head pressure control equipment includes wellhead adapters, wireline valves, lubricators, stuffing box (or grease tubes for braided cable) and other accessories that serves as well control while performing live well operations.

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