Matrix stimulation method for horizontal wells
- Dowell Schumberger (US)
Well-performance forecasts suggests that many horizontal wells could be good candidates for matrix stimulation, even in certain reservoirs where vertical wells should be stimulated only by hydraulic fracturing. This paper presents a technique for the matrix treatment of horizontal wells to allow uniform distribution of the stimulation fluids. It involves pumping a reactive fluid through coiled tubing and an inert fluid through the coiled-tubing/well annulus. The well is completed with either a slotted liner or a cemented and perforated casing. The coiled tubing, placed at the farthest end of the well is retrieved gradually at a rate dependent on the injection rate. Both rates are calculated and are contingent upon reservoir and well properties and upon desired stimulation-fluid coverage. The complex phenomenon of acid stimulation involves different rheological properties between acid and the inert fluid, simultaneous mass transfer and reaction kinetics, and for carbonate reservoirs, such instabilities as wormhole growth. Acid-volume distributions along the well are presented for cases with and without coiled tubing. This paper details the procedures for this treatment, discusses hardware configurations, and outlines recommended fluids, additives, and rates.
- OSTI ID:
- 5739209
- Journal Information:
- Journal of Petroleum Technology; (United States), Vol. 43:7; ISSN 0022-3522
- Country of Publication:
- United States
- Language:
- English
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