李海涛,胡永全,任岚
LI Haitao,HU Yongquan,REN Lan

• 1: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)：

在非常规油气资源中,页岩气的开发越来越受关注。由于页岩低孔低渗,页岩气开发需要更大的储层改造体积和复杂缝网。分段多簇压裂已经成为开采页岩气最常用的方式,合理的簇间距下,两个诱导应力差值大于原场水平主应力差值时,应力反转,迫使裂缝转向,有利于缝网形成。新的计算结果表明:应力差值并不是随着与第一条裂缝距离增大而单调增加或者减小,其变化为"M"形趋势;并且最优裂缝间距可由两条裂缝高度的算数平均值乘以某个比例系数表示。
In unconventional oil and gas resources,the development of the shale gas is attracting more and more attention.Because of the low porosity and low permeability for the shale,its development needs a larger size of the stimulated reservoir volume and more complex fracture network.Staged cluster fracturing has become the most commonly used way of the exploitation of the shale gas.Under the condition of the reasonable cluster/fracture spacing,when the two induced stress differentials are bigger than the differential of the in-situ horizontal main stress,the stresses are inverted,thus the fractures are forced to invert as well,in the end,the fracture network is beneficial to establish.The new calculated results show that the stress differentials are not monotonously increased and decreased with the increase of the distances far away from the first fracture,and the change trend of the differentials shows as " M" type;and moreover the optimal fracture spacing can be presented by the arithmetic average value of two fracture heights multiplied by a certain proportion coefficient.

关键词(KeyWords)： 裂缝间距;裂缝干扰;分段压裂;诱导应力;缝网
fracture spacing;fracture interference;staged fracturing;induced stress;fracture network

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“地应力分布特征及控逢高技术研究”(2011ZX05014-006-004HZ)

作者(Author): 李海涛,胡永全,任岚
LI Haitao,HU Yongquan,REN Lan

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