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张彦从,刘先贵,胡志明,等. 页岩气水平井体积开发产能评价模拟[J]. 科学技术与工程, 2020, 20(27): 11092-11098.
张彦从,刘先贵,胡志明,et al.Numerical simulation research on volume development assess production capacity of gas-shale horizontal wells[J].Science Technology and Engineering,2020,20(27):11092-11098.
页岩气水平井体积开发产能评价模拟
Numerical simulation research on volume development assess production capacity of gas-shale horizontal wells
投稿时间:2019-11-18  修订日期:2020-09-14
DOI:
中文关键词:  页岩气 体积开发 层间渗流 沟通判据 产能评价
英文关键词:Shale gas  Multi-layer mining  Interlayer seepage  Communication criterion  Capacity evaluation
基金项目:页岩气气藏工程及采气工艺技术
              
作者单位
张彦从 中国科学院大学
刘先贵 中国科学院渗流流体力学研究院
胡志明 中国科学院渗流流体力学研究院
端祥刚 中国科学院渗流流体力学研究院
李亚龙 中国科学院大学
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中文摘要:
      页岩气产能提高的主要方式是长水平井多段多簇水力压裂制造大规模的沟通缝网。为了进一步提升开发储层动用率,尤其是储层纵向动用程度,本文探索了储层开发的体积开发模式。相对于单井开采,体积开发需要考虑层间气体动用的问题。根据层间干扰强度划分层间沟通模式为:层间不沟通、层间渗流沟通和层间缝网沟通。结合势的叠加原理和流场边界层效应建立层间渗流沟通判据和计算模型。通过引入裂缝应力敏感的页岩气基质-裂缝渗流修正方程和主裂缝-次生裂缝-基质三重介质模型描述页岩气多尺度输运,揭示和评价了三种沟通模式下的长宁区块龙马溪组页岩气开采效果。结果表明:层间渗流沟通的体积开发模式最终产能提升效果显著,相较于单井开发叠加,估算的最终可采储量EUR可增加0.25亿方,增加比例达9.84%。缝网沟通过强的储层改造程度使储层流体压力下降过快,应力敏感现象显著,中后期开采能力下降严重,最终影响到整个产层储量的有效动用。体积开发三种模式中渗流沟通效果最好,缝网沟通和层间不沟通采收效果相当。该研究为实现储层体积开发高效动用所需的合理立体井位布置和压裂施工方案提供了理论指导。
英文摘要:
      The main way to increase the capacity of shale gas is to manufacture large-scale communication fracture by multi-segments and multi-cluster hydraulic fracturing on long horizontal wells. In order to further improve the utilization rate of developed reservoirs, especially the vertical utilization of reservoirs, this paper explores the volume development model of reservoir development. Compared with single well development, the volume development needs to consider the problem of interlayer gas utilization. According to Inter-layer interference intensity, the communication mode between the layers is divided into: no communication, flow communication, turbulent flow communication. The communication criterion and calculation model of interlayer seepage combined is established with the superposition principle of potential and the effect of flow field. The gas-shale matrix-fracture seepage correction equation and the main fracture-secondary fracture-substrate triple media model are introduced to describe the multi-scale transport of shale gas, together with appraise and demonstrate the production effect of gas-shale play in Changning area, Longmaxi Formation, under the three connection model condition. The results show that the three-dimensional development model of interlayer seepage communication has a significant effect on final productivity improvement. Compared with single well development, EUR(estimated Ultimate Recovery can increase by 25 million square meters, an increase of 9.84%. The seam network has caused the reservoir fluid pressure to drop too fast because of the strong reservoir reformation, the stress sensitivity phenomenon is significant, and the mining capacity in the middle and late stages is seriously reduced. Finally, it affects the effective use of the entire production reserve. Among the three modes of volume development, the seepage communication effect is the best, and the seam network communication is equivalent to the non-interlayer communication. This study provides theoretical guidance for the rational three-dimensional well placement and fracturing construction schemes required for the efficient development of reservoir three-dimensional development.
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