WELLLIT: ENABLING ACCESS FOR INCREASED RECOVERY

WellLIT for increased-recovery in mechanical solutions

Background

Saudi Aramco required a solution that would allow them to repeatedly access slim hole multilaterals in order to improve production logging. Current limitations meant logging only the motherbore and then defining the constituent contributions from the main well and the laterals. However, this procedure yielded imprecise information since the laterals were not logged individually.

With the introduction of the Welltec® Lateral Intervention Tool (WellLIT™) it became possible to deploy toolstrings into multi-laterals, reliably and efficiently. Saudi Aramco, a partner in the development of the WellLIT, began to apply it to perform logging jobs in wellbore sections that had previously never been logged.

OPERATION

In February 2015, a 2 1/8” WellLIT was mobilized to the southern part of Saudi Arabia with the objective to access the highly deviated, slim hole motherbore and laterals. The WellLIT was run in hole, successfully deploying the PLT into the lateral to a depth of 8,230 ft (2,509 m) for data acquisition. Then it was pulled back out to the mainbore where CT pushed the toolstring as deep as possible in the motherbore, which was logged from 8,487 ft (2,587 m).

Shortly after, another well in the same field with a similar profile was logged. The lateral was accessed and logged from 7,690 ft (2,344 m) before logging the motherbore.

During both operations the WellLIT delivered just what it was designed to do. It provided Saudi Aramco an opportunity to evaluate each lateral, gaining more insight and information about the reservoir and lateral section. Subsequently this would enable them to enhance well or reservoir production if they so choose.

ACHIEVEMENTS

The ability to re-enter laterals effectively and on-demand with coiled tubing provides tremendous increases in efficiency. The WellLIT makes accessing laterals possible and provides Saudi Aramco improved data from production logging jobs, leading to enhanced productivity. Running on e-line allows operators almost anywhere in the world to mobilize quickly with smaller sets of equipment and fewer personnel.

Following on these two wells, a further four wells have been successfully logged in Saudi Arabia utilizing this novel technology.

WELL TYPE: OIL PRODUCER
DEVIATION: 90° (MOTHERBORE)
92° (LATERAL SECTION 1)
DEPTH: 8,487 FT (MOTHERBORE)
8,230 FT (LATERAL 1)
MAX. PRESSURE: 2750 PSI
MAX. TEMPERATURE: 151°F (66°C)

The ability to re-enter laterals effectivelyand on-demand with coiled tubing provides
tremendous increases in efficiency