Monitoring Acid-Stimulation Treatments With Slickline Distributed-Temperature Sensing
- Chris Carpenter (JPT Technology Editor)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- June 2015
- Document Type
- Journal Paper
- 94 - 96
- 2015. Society of Petroleum Engineers
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- 116 since 2007
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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 173640, “Monitoring Acid-Stimulation Treatments in Naturally Fractured Reservoirs With Slickline Distributed-Temperature Sensing,” by Stephen Grayson, SPE, Yosmar Gonzalez, Kevin England, SPE, Ryan Bidyk, and S. Farrell Pitts, SPE, Schlumberger, prepared for the 2015 SPE Coiled Tubing and Well Intervention Conference and Exhibition, The Woodlands, Texas, USA, 24–25 March. The paper has not been peer reviewed.
Mechanical-diversion techniques can ensure acid injection into the various intervals of naturally fractured reservoirs. With these methods, surface pressure can be monitored to assess fluid-placement effectiveness for each zone treated, but uncertainty of the friction pressure in the pipe while pumping can result in an incorrect interpretation of fluid entry. A new technique using fiber-optic distributed-temperature-sensing (DTS) measurements offers a solution when bullheading by providing an indication of where the acid has been injected into the fractured reservoir.
The variability of fracture density and aperture along with fluid conductivity poses challenges to the goal of achieving uniformity of acid distribution to all fractures in a well. The optimum technique would allow effective treatment of all fractures, be operationally efficient, and facilitate the determination of treatment effectiveness in real time.
Diversion of the treatment fluid helps ensure that the entire interval is stimulated effectively on the basis of design objectives. When diversion is not considered, there is a significant reduction in the ensurance of complete zonal coverage. In the past, the rule of thumb has been to recommend diversion when attempting matrix stimulation of more than 20 ft of zone.
Diverters can be separated into two broad categories, mechanical and chemical.
- Mechanical diversion is the category that comprises devices such as staged completion systems, bridge plugs and packers, straddle packers, balls and baffles, and sliding sleeves.
- Chemical diversion relies on the ability to perform an action to reduce fluid injection into these zones taking most of the early-time injection fluid and to redistribute the injection to other regions of the formation that also need to be stimulated.
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