谢斌,任岚,贾久波,黄波
XIE Bin,REN Lan,JIA Jiubo,HUANG Bo

• 1:中国石油新疆油田分公司工程技术研究院
• 2:西南石油大学油气藏地质及开发工程国家重点实验室

摘要(Abstract)：

对裂缝性火山岩储层实施高效的体积压裂,能够有效激活火山岩天然裂缝,提升压裂改造效果。量化裂缝性火山岩储层体积压裂过程形成的剪切错位自支撑裂缝导流能力,对优化压裂设计和提高储层压后效果具有重要意义。以新疆车排子油田为实例,开展了裂缝性火山岩裂缝导流能力的室内实验评价,深入研究剪切错位自支撑作用和自支撑与低浓度铺砂复合作用对裂缝导流能力的影响。结果表明:储层岩石弹性模量低,弹脆性差,剪切错位裂缝的自支撑能力较弱,在储层有效闭合应力条件下,天然裂缝自支撑导流能力仅为1.0μm~2·cm,难以满足对流体的导流要求;在低浓度铺砂与剪切自支撑复合作用下,裂缝可保持导流能力20.0μm~2·cm以上,且与铺砂浓度呈正相关性,但与剪切错位量关系不明显。研究成果为同类油气藏提高体积压裂的裂缝导流能力方法设计提供了借鉴。
With the help of high-efficiency volume fracturing technique, fractured volcanic reservoirs can achieve the effective activation of the natural fractures of the volcanic rocks and moreover improve the fractured effects. Quantifying the shear-displacement self-supporting fracture conductivity formed in the fracturing process of the fractured volcanic reservoirs is of great significance for optimizing the fracturing design and improving the fractured effects of the reservoirs. Taking Xinjiang Chepaizi Oilfield as an example, the indoor experimental evaluation of the fracture conductivity of the fractured volcanic rocks was carried out to deeply study the influences of the shear-displacement self-supporting action and the combined action between the self-supporting and low-concentration sanding. The results show that the reservoir rocks have low elastic modulus and poor brittleness, and the self-supporting ability of the shear-displacement fracture is rather weak. Under the effective closed stress condition of the reservoir, the self-supporting conductivity of the natural fracture is only about 1.0 μm~2· cm,which is difficult to satisfy the required conductivity of the liquid; under the low-concentration sanding and shear self-supporting combined action, the fracture can maintain the conductivity of 20 μm~2· cm or more, and the positive correlation with the sanding concentration is obvious, while there is no obvious relationship with the shear displacement. The research results can provide reference for optimizing the method and design of enhancing the fracture conductivity of the volume fracturing in the similar oil and gas reservoirs.

关键词(KeyWords)： 裂缝性火山岩;体积压裂;导流能力;自支撑裂缝;低浓度铺砂
fractured volcanic rock;volume fracturing;flow conductivity;self-supporting fracture;low-concentration sanding

Abstract:

Keywords:

基金项目(Foundation): 国家“973”计划“陆相致密油高效开发基础研究”(2015CB250906);; 国家科技重大专项“致密油富集规律与勘探开发关键技术”(2016ZX05046-004)

作者(Author): 谢斌,任岚,贾久波,黄波
XIE Bin,REN Lan,JIA Jiubo,HUANG Bo

DOI: 10.19597/j.issn.1000-3754.201908029

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