Experimental study and application of stimulation technologies for Sinian Dengying Formation reservoirs in the Sichuan Basin

被引：0
作者：
Han H. [1 ,2 ]
Sang Y. [1 ,2 ]
Yang J. [1 ,2 ]
机构：
[1] Engineering Technology Research Institute of PetroChina Southwest Oil and Gasfield Company, Guanghan, 618300, Sichuan
[2] National Energy R & D Center of High-Sulfur Gas Reservoir Exploitation, Chengdu, 610213, Sichuan
来源：
Natural Gas Industry | 2016年 / 36卷 / 01期
关键词：
Acid-rock reaction; Acidizing wormhole; Deep acidizing; Field application; Permeability volume; Reservoir stimulation; Separate-layer acidizing; Sichuan Basin; Sinian;
D O I：
10.3787/j.issn.1000-0976.2016.01.010
中图分类号：
学科分类号：
摘要：
For improving the stimulation effects of the Sinian Dengying Formation reservoirs in the Sichuan Basin, studies were conducted on the retarding rate of acid-rock reaction speeds of different acidizing fluids at high temperature, the retention rate of flow conductivity of acid-etched fractures under high closure pressure with different acid fluids and injection modes, the minimum breakthrough time in acid fluid breakthrough tests, the numerical characterization of acid-etched fracture morphology, and the diverting plugging effects of ball fracturing. Then, the host types of acid fluids applicable for the Dengying Formation reservoir stimulation were proposed, the principal stimulation technologies for different types of reservoirs were developed and operational parameters were optimized. Field tests were conducted at 18 wells with an average single-well production rate of 45.482×104 m3/d. Finally, the following conclusions are reached. First, the influential factors on acid-rock reaction speeds are ranked as acid fluid type > temperature > rotation speed > acid fluid concentration > common-ion effect. So in the acidizing stimulation of Dongying Formation reservoirs, focus should be on acid fluid types, rotation speed (operational discharge) optimization and cooling measures. Second, not only deep breakthrough can be realized, but also flow conductivity can be higher by using the injection order of self-generating acid + gelled acid + diverting acid. Third, high-temperature gelled acid stimulation is applicable for vuggy reservoirs. For strong-heterogeneity reservoirs high-temperature diverting acid should be adopted to realize uniform stimulation. For tight reservoirs with undeveloped fractures and vuggies, self-generating acid and host acid should be injected alternatively to form long fractures. Fourth, depth acid fracturing should be the principal technology, except for several reservoirs with developed fractures. Fifth, the discharge rate of breakdown acidizing operation should be at least 3.5 m3/min. Sixth, based on the resoluble ball fracturing diverting acidizing technology, the injection rate of acid fluids to each acidified reservoir can be adjusted, so that heterogeneous reservoirs can be stimulated uniformly. © 2016, Natural Gas Industry Journal Agency. All right reserved.
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页码：81 / 88
页数：7
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