In March 2007, Reservoir Development Consulting, LLC completed a restimulation survey of consultants and producers operating primarily in North America and typically within the United States Rocky Mountain region. Thirty-eight email invitations were distributed to 6 consultants and 32 managers or engineers representing both major and independent producing companies. Unlike the Spears & Associates survey, no service company personnel were invited to respond. A total of 18 complete responses were obtained, with one response from an operator in the Canadian Rockies and one international response from an operator in Australia.
The survey was designed such that the first 5 questions mirrored those asked by Spears & Associates more than a decade earlier. Results of the first 3 questions are as follows.
“During 2006, the number of restimulation/refracturing treatments your company performed was?”
Sixty-one percent of the respondents indicated they performed less than 10 restimulation treatments in 2006. Eleven percent indicated 50 to 100 restimulation treatments and 6% indicated more than 100 restimulation treatments. While not all 2007 respondents represented Rocky Mountain operators, the new survey indicates more than “limited” restimulation activity. Based on the survey results, a minimum of 240 restimulation treatments were completed by the respondents during 2006.
Clearly, the number of active restimulation programs remains limited, but the number of restimulation programs has increased over the past decade. Reservoir Development Consulting, through providing technology and manpower for identifying, evaluating, and implementing a restimulation program, hopes to increase restimulation opportunities for operators across North America.
“Following restimulation, how much improvement in production was observed?”
Sixteen respondents reported mixed results for restimulation. Thirty-one (31%) percent reported less than 10% improvement in well production following restimulation. Conversely, 31% reported more than 100% improvement in well production following restimulation. Twenty-five percent reported a production increase between 10% and 50%, and 69% of all respondents reported more than a 10% increase in production following restimulation.
Restimulation programs are not widespread primarily because of the uncertainty in productivity increase. In many cases, infill wells have lower risk with predictable productivity and reserves, so instead of optimizing productivity in existing wellbores and producing bypassed gas, drilling new wells is the preferred method for increasing production. The technology and services offered by Reservoir Development Consulting minimize uncertainty and risk in restimulation programs, which can make the programs cost competitive with infill drilling.
“Restimulation candidates are identified by which of the following (select all that apply)?”
As shown in Fig. 1, and as expected, 61% of the respondents indicated that well production was used to identify restimulation candidates, which is similar to the results obtained in the 1995 survey. What was unexpected was that the second most common method for identifying restimulation candidates was “Intuition.” Intuition was selected by more respondents than selected the high tech methods “Fracture diagnostics,” “Production Logs,” “Production-data (rate-transient) analysis,” and “Pressure-transient testing.”
Reservoir Development’s technology and services combine well production evaluation with state-of-the-art diagnostics in an attempt to improve restimulation success, especially in wells producing from multiple layers.
The discussion of Reservoir Development’s 2007 Restimulation Survey results will be continued in Part II.
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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