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Step-down tests help save $8.7 million over one year - Eagle Ford

Well Data

  • Location: Eagle Ford, South Texas
  • Operator: Independent
  • Well type: Oil
  • Number of wells/stages: 50 wells/1,400 stages pumped
  • Completion design: Plug & perf
  • Diagnostics: FRACPRO fracture design & analysis software
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STRATAGEN
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FRACPRO

Impressive reductions in screen-outs, acid consumption, gel loading enhance economics.

Eagle Ford, South Texas

The challenge

The client placed a premium on ensuring proper placement of its fracture stimulation jobs to avoid costly screen-outs and reduce the high consumption levels of expensive acid and gels. To reach that objective, a valuable diagnostic tool was utilized in performing routine step-down tests to determine near-wellbore friction values prior to the main treatment of every fracture stage. Step-down tests are beneficial in any environment as they allow the on-site consultant to make remedial changes to the treatment in order to ensure a successful placement of the job.

The solution

Over the course of one year, STRATAGEN, using data generated by the FRACPRO fracture design and analysis software, conducted step-down tests as part of its on-site consulting services for this client. The analysis, which were performed on 50 of the operator’s wells, across 30 pads, quantified near-wellbore pressures to ensure proper placement. For example, on one well using 20/40 resin-coated sand, the step-down analytical data revealed an unacceptable build-up of pressure, prompting a treatment adjustment, to cut sand and flush the well. Fundamental to the ongoing analysis was the continual tracking of formation response (fracture gradients and leak-off) to allow real-time adjustments to maximize treatment efficiencies and reduce costs.

Ongoing step-down tests reduce the operator’s overall costs by $8.7 million

Step-down tests help save $8.7 million over one year

 

The results

During the year, a cumulative 1,400 stages were pumped with the screen-out rate dropping from the industry average of 2% to an impressive 0.5%, reducing the associated costs by some $3.3 million. Further, the use of very costly stimulation acid was cut from 5,000 to 2,000 gal, saving a total of $4 million throughout the year. Add in the $1.4 million saved by using approximately 280,000 lb less gel, and the ongoing step-down tests reduced the operator’s overall costs by approximately $9 million.

When step-down test data revealed a build-up in near-wellbore pressure, the treatment schedule was adjusted in real-time with 20/40 resin-sand cut and the well flushed.

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