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唐梅荣,居迎军,郭超,等. 二氧化碳压后焖井过程中含弱面致密砂岩断裂特征[J]. 科学技术与工程, 2020, 20(30): 12372-12378.
TANG Mei-rong,JU Ying-jun,GUO Chao,et al.Fracture characteristics of tight sandstone with weak plane during well shut-in after carbon dioxide fracturing[J].Science Technology and Engineering,2020,20(30):12372-12378.
二氧化碳压后焖井过程中含弱面致密砂岩断裂特征
Fracture characteristics of tight sandstone with weak plane during well shut-in after carbon dioxide fracturing
投稿时间:2020-03-02  修订日期:2020-08-01
DOI:
中文关键词:  二氧化碳压裂  压后焖井  致密砂岩  断裂特征  细观损伤
英文关键词:carbon dioxide fracturing  well shut-in after fracturing  tight sandstone  fracture characteristics  meso damages.
基金项目:国家科技重大专项“致密油富集规律与勘探开发关键技术”(2016ZX05046)和“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069)
           
作者单位
唐梅荣 长庆油田油气工艺研究院
居迎军 长庆油田第六采油厂
郭超 长庆油田第二采油厂
李磊 长庆油田第七采油厂
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中文摘要:
      二氧化碳(CO2)压后焖井是致密砂岩储层补充地层能量的一种关键技术,同时也能使得已有裂缝发生扩展。致密砂岩储层中,弱面(如层理、天然裂缝)广泛分布,CO2可与砂岩发生物理、化学反应,进而影响储层稳定性及裂缝的复杂程度。本文以鄂尔多斯盆地含3种角度(0°,45°和90°)弱面性层理的致密砂岩为实验材料探究CO2对弱面性层理试件断裂特征的影响。首先,将试件分为两组,一组采用超临界CO2(SC-CO2)饱和30天,另一组仅置于大气条件下不做处理;随后通过三点弯实验测试相应试件的断裂韧性,并结合声发射技术监测试件断裂过程中声发射信号的演化规律。研究表明:CO2作用使得含弱面性层理致密砂岩试件的断裂韧性降低约40%;CO2作用使得试件初始损伤阶段提前,损伤扩展阶段持续时间增长;最后作者从细观损伤力学的角度揭示了CO2影响含弱面性层理致密砂岩断裂韧性及裂缝扩展规律的作用机理。本研究以期提高含弱面性层理的致密砂岩储层在CO2压后焖井过程中岩石断裂行为的认识。
英文摘要:
      Well shut-in after carbon dioxide fracturing is a key technology to enhance energy in tight sandstone reservoirs, and it can also extend existing fractures. In tight sandstone formations, weak plane (such as weak bedding and natural fractures) are widely distributed. CO2 can physically and chemically react with sandstone, which will affect the stability of the formation and the complexity of fractures. In this paper, the influence of CO2 on the fracture characteristics of sandstone with weak plane was investigated, and the materials were collected from the Ordos Basin with three weak plane angles (0°, 45° and 90°). Firstly, the specimens were divided into two groups, one was saturated with supercritical CO2 (SC-CO2) for 30 days, and the other was left in the air without any treatment. Then, the fracture toughness of corresponding specimens was tested through three-point bending tests, combined with acoustic emission technology to monitor the evolution of acoustic emission signals during the fracture process. It was found that: CO2 reaction with rock reduced the fracture toughness of tight sandstone specimens with weak plane by about 40%; CO2 reaction advanced the initial damage stage and increased the duration of the damage expansion stage; finally, the mechanism of CO2 influencing on the tight sandstone fracture toughness and fracture propagation with weak plane was discussed from the perspective of meso-damage mechanics. This study aims to improve the understanding of fracture behavior in tight sandstone reservoirs with weak plane during well shut-in after CO2 fracturing.
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