Page 39: of Offshore Engineer Magazine (Sep/Oct 2022)

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TECH FEATURE PRODUCTION OPTIMIZATION

Figure 1 AICD unit mounted into sand screen joints illustrating production fow path.

Figure 2

Retroft AICD completion in existing standalone screen with the production fow path.

ranges from 12 to 200cP have been reported. controlling water production from the bottom aquifer.

It was possible for the well to install 3-1/2” AICD subs In summary, water cut was reduced from 97% to 87% with swellable packers to retroft the AICD completion. As helping produce 200% more oil compared to production shown in Figure 3, 54 AICD 7.5mm devices were retroftted prior to re-completion (Figure 4). into the existing 5-1/2” ICD screen based on results of a stat- The performance simulation analysis shows optimum ic wellbore modeling. If necessary, chemical packing material water control could be achieved by imposing effective back can be placed in the annulus at the original packer position pressure against water production when daily liquid produc- to enhance the effective separation of the horizontal section. tion rate is around 11,000bbl/d. It is expected that future

The optimum retroft completion was to install a 2 3/8” liquid production rate will be maintained at 11,000bbl/d inner string consisting of AICD subs and swellable packers while the current water cut will be maintained with the inside the existing ICD/screen completion. AICD retroft completion, compared to the existing ICD completion in which the water cut continues to increase.

Although the well was at very late stage of its lifetime

Optimized well performance

The well was successfully re-completed with FloSure with an increasing trend of water cut (above 97%) and a signifcant volume of original liquid was already produced

AICD completions and over a nine-month period of pro- duction, well performance was optimized. ACID valves before operation, it is estimated that total oil production of 71,100Sm3 could be produced by the AICD comple- restricted liquid production from the frst and fourth sec- tion. This is signifcant when noting that the well without tions with high permeabilities especially undesirable fu- ids, and greatly increased oil production in the second and AICDs could produce total oil volume of only 30,200Sm3 third sections of well with low permeability, effectively oil. In other words, an extra 40,900Sm3 cumulative oil

SEPTEMBER/OCTOBER 2022 OFFSHORE ENGINEER 39