Chemical sand consolidation (SCON) is a type of sand exclusion which withholds unconsolidated formation from disintegrating and producing loose grains into the wellbore. The produced sand can lead to plugging off completion accessories and eroding surface facilities which eventually, over long period of time, will hamper production of a well. Most of the time, a well needs to be shut in and some oil reserves will be left behind the casing. It requires investment in bailing out the sand from the well or may be to the extend of incurring high investment to workover the well.
Sand exclusion with internal gravelpacking (IGP) has been proven in Baram Delta field, Sarawak since early 60's. In early 90's, acidprepacking was introduced as part of gravelpacking job for better placement of gravels in the perforation tunnels. Historical performances show that the well has less skin than the conventional gravelpacking as the acid used can clean up the perforation tunnels and place the gravels inside them. The technique proved that the well flushed with acid prior to gravelpack job can sustain production much longer and at higher rate.
There are many chemical SCON (e.g. phenolic, epoxy, and furan) available in the market, but the project team decided to use furan resin mainly due to its economic viability. At the end of 1998, furan resin was applied in one of the Baram wells and it had improved production rate and much less skin compared to the well using IGP in the same reservoir package. Sand treated with resin is capable of delivering about 1000 bopd from 15 ft. of perforation interval compared to only 400 bopd in 49 ft. IGP perforated interval in another typical well.
In Baram Delta case even with snort perforation interval, the sand treated with resin can potentially deliver higher production than the sand controlled with IGP. The success of the pilot furan resin application are mainly due to the combination of a good drainage point selection, drilling practices, and cooperation between the production team and the project team during the production phase.