Selective Open Hole Stimulation with HydraJet™ SPT

Challenges 

An oil producing well in Oman completion with 3-1/2” production tubing above a 7” open hole section had lost production over time from a build up of filter cake and other NWB (Near WellBore) damage processes in a tight formation.

Intervention was required to restore well production without removing the existing completion string. Challenges included:  

• Removal of existing NWB damage to restore connectivity to previously stimulated intervals 
• Enabling injectivity of treatment into a tight formation 
• Selectively placement treatment in 7” ID target intervals while working with 3-1/2” ID restriction of production tubing 
• Recovering spent acid and restoring well flow with N2 lift after treatment 

Solution 

Halliburton proposed selective placement of a 15% HCl acid treatment with the HydraJet™ SPT (Self Positioning Tool) to remove the filter cake and enable the treatment to bypass NWB damage.

The HydraJet™ SPT is a thru-tubing tool that combines jetting technology with a self-decentralizing capability activated by internal pressure. Use of this tool enables: 

• Effective jet placement, reducing stand-off below large ID restrictions 
• Improved efficiency of jetting due to less dispersion of the jet stream and more coherent flow
• Focused injection of chemicals into the rock matrix to bypass NWB damage 
• Ability to combine selective acid treatment and N2 lift into a single run on coiled tubing 

Results 

The results were exceptionally good, with post intervention production levels returning at higher than the original production of the well.

Oil production of the well was higher than offset wells stimulated by conventional processes.