EXCITE System reverses decline from frac hits – adds $1.5M NPV to wellbore

RESTORES WELLBORE TO PRE-FRAC HITS LEVELS, REVERSING 40% DECLINE IN EUR

Frac hits are an increasing problem in the shale industry. Fortunately, operators now have a field proven methodology to remediate frac hit wells and fully restore wellbore production.

SITUATION

The candidate wellbore was targeting the Lower Mississippian formation in Kingfisher County, Oklahoma, which was completed with 30 open hole stages and swellable packers for zonal isolation. The well was completed in July 2016, with initial production of 360 BOPD.

By December 2017, immediately following the fracture treatment on an offset wellbore, production significantly declined to a negligible level. The client estimated that the frac hits reduced estimated ultimate recovery (EUR) by 40%. Initial attempts to restore production through cleaning out the wellbore had not yielded desired results. Comitt was then contacted for a solution to repair the damage caused by frac hits and revive production.

COMITT’S SOLUTION

Our technical team suggested using the Excite System for focused acid re-stimulation of each stage to ensure all affected producing fractures were treated. The Excite System was set up with an 80 ft. packer to packer straddle, which would isolate the perforations for each stage in a single trip

EXCITE Reverses the Decline From Frac Hits

SEQUENCE OF EVENTS

In September 2018, Comitt performed the acid re-stimulation. The Excite BHA was run in-hole on a tapered 2-7/8” x 2-3/8” tubing. Each of the 30 original stages were isolated by swell packers that isolated each of the 30 original stages. For each stage, fluid was pumped down the tubing string to activate the Excite System. A pressure signature was observed on the surface each time the tool was set. Once a stage treatment was completed, the Excite System was un-set by unloading tubing pressure, and the tool was repositioned to the next stage above. The Comitt Excite System was run to treat each of the 30 stages individually with 2000 gallons of acid per stage. The 30 zones were stimulated in a single trip, with an average of 15 minutes between each stage, and the entire operation took approximately 24 hours. A total of 60,000 gallons of acid was pumped during the job, with treatment pressure up to 7,000 psi and treatment rates between 5-7 BPM for each stage.

RESULTS AND CONCLUSIONS

Initial production following the treatment showed a threefold increase in oil production; however, the true benefit from the pin-pointed treatments is shown in the sustained production uplift for the well.

  • One year after the treatment, production from the wellbore follows the same decline curve as prior to the frac hits, proving that all frac hit damage had been repaired and the wellbore was restored to full production.
  • Frac hits are an increasing problem in the shale industry. Fortunately, operators now have a field proven methodology to remediate frac hit wells and fully recover lost production and EUR.
  • The customer’s one-year return on the treatment was in excess of 300% IRR, and the total benefit from the restored production is estimated to over $1.5M NPV (10).
  • Distinct set, stimulation, and un-set signatures were observed for each stage during the treatment, providing operational confidence.
  • The quick and smooth stimulation of the 30 stages saved operational time and money.
  • One month post operation, the client confirmed that “the acid job repaired the damage, consequently increasing our EUR to pre frac hits projections.” The operation proved to be a great ROI for our client.
  • Acid re-stimulation using Comitt’s Excite System was tested and validated as an effective solution for revitalizing wells with frac hits damage.