Acid-Fracturing Treatment: A Surface-Topography Analysis of Acid-Etched Fractures To Determine Residual Conductivity
Acid-Fracturing Treatment: A Surface-Topography Analysis of Acid-Etched Fractures To Determine Residual Conductivity
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DOI：
10.2118/38175-pa
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发表时间：
1998-06-01
期刊：
影响因子：
3.6
通讯作者：
Onaisi, Atef
中科院分区：
文献类型：
--
作者：
Ruffet, C. S.;Fery, J-J;Onaisi, Atef
如果碳酸盐岩地层的压裂酸化处理在处理后仍保持相对良好的裂缝导流能力，则可以认为是成功的。为了达到这一目标，酸对裂缝的腐蚀是不均匀的，因此，一旦作业后压力释放，就会形成通道，在水力上保持裂缝张开，从而提高生产率。残余电导率是表面不均匀蚀刻的结果，但这种蚀刻在现场发生的方式尚未得到很好的理解，因此描述不佳。因此，我们在本文中提出了一种实验方法来研究和定量描述酸注入条件如何影响裂缝表面，所产生的粗糙表面如何能够支撑应力，以及如何从表面形貌估计裂缝导电性。本文提出的与酸化实验相结合的表面形貌统计研究，为酸化压裂作业的设计提供了一种新的、有趣的方法。它可以帮助选择给定地层类型和井况的最佳流体配方和流量，并预测压裂后的裂缝行为。
A fracture-acidizing treatment of carbonate formations can be considered successful when a relatively good fracture conductivity remains after treatment. To reach such a goal, an uneven etching of the fracture by acid is expected, so that channels are created that hydraulically maintain the fracture open, once the pressure is released after the job, and thus enhance productivity.Residual conductivity is the consequence of uneven etching of the surface, but the way this etching occurs in the field is not well understood and, therefore, poorly described. We, thus, propose, in this paper, an experimental methodology to investigate and characterize quantitatively how acid injection conditions affect the fracture surfaces, how the created rough surface is able to support the stress, and, finally, how fracture conductivity can be estimated from the surface topography.The statistical investigation of surface topography associated with acidizing experiments proposed in this paper, provides a new and interesting method for designing an acid fracturing job. It can be used as an aid to select the best fluid formulation and flow rate for a given formation type and well conditions and to forecast the behavior of the fracture after the treatment.