In 1995, Advanced Resources International, Inc., began studying the North American restimulation market. One of the first orders of business was to enlist the services of Spears & Associates to complete a restimulation market survey. Two objectives were defined by Spears & Associates for the survey. First, producing and service companies were surveyed about well remediation activities, and second, restimulation activity was to be forecast through the year 2000. Spears conducted “almost 100″ interviews in person or by telephone across the different producing regions of North America. In the United States Rocky Mountain region, a total of 19 interviews wee completed with either managers or engineers from producing companies and with service company representatives.
The responses to five questions from the 1996 survey were particularly enlightening:
“In the last 12 months, how much emphasis has your company placed on remediation or restimulation of wells in this region?”
The survey reports “almost noe” as the current operator focus on restimulation in the Mesaverde formation. Frontier formation restimulation activity was reported as being “limited.”
“On average how much improvement results from this remedial work?”
One Mesaverde formation operator reported a 15% productivity and recovery improvement. Operators in the Frontier formation reported more success with remedial treatments. Production rate increases of 50% to 75% were reported.
“What reservoir or stimulation performance problem were you trying to solve?”
All Mesaverde operators surveyed reported that below expectations well productivity was the problem needing remediation. Frontier operators identified multiple problems, including productivity below expectations and problems during the original stimulation treatment.
“How do you determine if remediation is necessary?”
Only well production data was used to identify restimulation candidates.
“What technical barriers prevent more successful restimulation?”
Respondents producing Mesaverde formations replied that reservoir quality is the only technical barrier. Frontier formation producers identified proper stimulation technique and stimulation fluids as the technology barriers.
Overall, the Spears & Associates, Inc., restimulation market survey results found relatively little interest in restimulation in 1996, and the authors forecast a flat US refrac market of about 470 refracs through the year 2000.
The survey predated the massive refracture market that developed following extremely successful refracturing programs in the DJ Basin of eastern Colorado and in the Barnett Shale in north Texas. DJ Basin refracturing began in 1997, and Barnett shale refracturing begain in 1999. By the end of 2004, more than 1,500 refracs had been pumped in the Codell formation of the DJ Basin, and in the same time frame, more than 350 refracs had been pumped in the Barnett shale. By 2009, several thousand additional refracs have been pumped in the DJ Basin, and some Codell wells have been refraced four times. The current dilemma is when to refrac and not if refracs are necessary.
In 2007, Reservoir Development completed an updated restimulation survey. Several subsequent posts will summarize the results of the 2007 survey.
DrBubba, aka Dr. David P. Craig, in addition to owning Reservoir Development Consulting is also an employee of Halliburton. Consequently, Halliburton requires that DrBubba post the following disclaimer:
The information on this site is mine and does not necessarily represent Halliburton's position, strategy, or opinion.
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