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考虑裂缝壁面伤害的压裂井产能计算模型
A Post-Fracturing Productivity Model of Considering Fracture Face Damage
曾冀
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作者单位:西南石油大学
中文关键字:水力压裂;裂缝壁面伤害;有限导流能力;产能
英文关键字:hydraulic fracturing; fracture face damage; finite conductivity; productivity
中文摘要:为了准确计算压裂井产能,在对伤害带深度进行量化的基础上,采用压降叠加原理和直接边界元法,建立了拟稳定状态下考虑裂缝壁面伤害的有限导流能力压裂井产能计算模型。该模型计算结果表明:压裂液滤失造成的裂缝壁面伤害会降低压裂井产量,且随着导流能力的降低影响越严重;对于有限导流能力裂缝,随着导流能力的降低,高产段会从裂缝端部转移到裂缝根部。通过对比忽略壁面表皮及使用平均壁面表皮与本模型楔形壁面表皮计算的产量差异,发现忽略壁面表皮及使用平均壁面表皮计算的产量始终偏大,且随着导流能力的降低,差异程度逐渐增大。将本文模型改进还可得到水平井伤害产能计算模型。
英文摘要:In order to calculate the post-fracturing productivity accurately, this paper quantified the depth of damaged zone caused by fluid leak-off. The potential superposition principle and direct boundary element method was used here, thus a post-fracturing production calculation model under pseudo steady state with finite conductivity and considering fracture face damage was developed. Calculation results show that fracture face skin decreases the productivity of the fractured well. With the conductivity decreased, the influence is more serious. For highy conductive fracture most of the fluid enters the fracture in the region near the tips, as conductivity decreases the flow entering the fracture in the vicinity of the wellbore. Compared with ignoring fracture face skin and using average fracture face skin, the productivity calculated by the above two models is always higher than the productivity of wedge-shaped damage zone used in this paper. Besides with the decrease of the conductivity, the degree of difference is gradually increasing. This model can be improved to apply to horizontal well productivity calculation with damage.
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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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