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一种页岩气水平井均匀压裂改造工艺技术的应用与分析
Uniform fracturing technologies and their application to shale-gas horizontal wells
曾 凌 翔
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作者单位:中国石油川庆钻探工程公司井下作业公司
中文关键字:页岩气 水平井 均匀改造 暂堵 工艺
英文关键字:Shale gas; Horizontal well, Uniform stimulation; Temporary plugging, Technology
中文摘要: 我国页岩气资源量丰富,与美国页岩气资源量相当。压裂改造形成复杂裂缝是页岩储层获得工业油气流的关键。针
对页岩的非均质性特征,页岩水平井均匀改造技术主要通过封堵已改造区域,进一步改造未压裂区域,实现改造段全覆盖,增加
裂缝接触面积,提高裂缝复杂程度与作业时效的改造技术。结合组合粒径暂堵球、暂堵球+暂堵剂、暂堵颗粒+暂堵粉末等多种
技术手段,优化相关关键参数,形成了3 种不同的页岩储层均匀改造工艺模式:段内均匀改造工艺模式、多段均匀改造工艺模式、
加密射孔均匀改造工艺模式。暂堵剂较暂堵球到位响应弱,封堵效果显著,泵送排量与封堵效果无直接关系。暂堵压力响应值最
高达9 MPa。压裂施工曲线与微地震监测显示,井段均匀改造效果明显,高/ 低应力区域得到有效改造,监测事件响应点覆盖率
100%,单段SRV 体积提高40.2% ~ 44.8%,微地震事件数量增长30.4% ~ 53.6%。

 

英文摘要:In China, there is abundant shale-gas resources equivalent to those in USA. Complex fracturing-induced fractures are crucial
to obtain commercial oil and gas flow from shale reservoirs. Due to reservoir heterogeneity, some technologies to plug stimulated
segments and stimulate unfractured segments may realize full coverage of stimulated segments, enhance contact area among fractures,
and increase fracture complexity and fracturing efficiency. So, with the combination of temporary plugging ball with different size,
temporary plugging ball + temporary plugging agent, and temporary particles + temporary plugging powder, some corresponding key
parameters were optimized, and three stimulation modes were established, including intra-segment, multi-segment, and uniform stimulation
with closely spaced perforation. Compared with temporary plugging ball, temporary plugging agent is weaker in terms of position
response, and has more remarkable plugging effect; there is no relationship between pumping displacement and effect; its maximum
pressure response may achieve 9 MPa. Moreover, it is shown from fracturing curves and microseismic monitoring that, uniform
stimulation may gain an obvious effect, especially in some zones with high or low stress; coverage rate is 100% for those monitoring
event response points; and SRV per segment and microseis events increase by 40.2% ~ 44.8% and 30.4% ~ 53.6%, respectively.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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