异常高压页岩气藏应力敏感及其合理配产研究

doi:10.11885/j.issn.1674-5086.2014.03.11.01

摘要/Abstract

摘要：

异常高压页岩气藏生产中表现为初期产量迅速递减的特征，这种情况一方面和页岩气低渗透压裂投产的方式
有关，另一方面可能和储层及压裂缝应力敏感有关。分析了页岩气井储层及压裂缝应力敏感特征，认为储层和压裂缝
在力学性质上有较大差别，应分别进行考虑，采用数值模拟方法计算了考虑应力敏感和配产大小对最终采气量的影
响，结果表明，储层的应力敏感对页岩气的生产影响较小，压裂缝应力敏感影响相对较大，如果考虑渗透率应力敏感只
和压力有关，则配产大小对最终采气量影响不大，而假设高产下具有更强的渗透率应力敏感衰竭曲线，则初期配产对
最终采气量影响较大，并采用图形诊断法进行分析，证实了这种情况下初期低配产气井生产潜能更大，研究成果可以
用于高压页岩气井的合理配产优化。

关键词: 页岩气, 应力敏感, 配产, 异常高压, 数值模拟

Abstract:

Production of abnormal high pressure shale gas reservoir is characteristic of rapid decline of initial production. On the
one hand，this is related to the well production by fracturing of low permeability shale gas；on the other hand，it may be related
to the pressure-dependent permeability of reservoir and fracture. This paper analyzes the stress- sensitivity of hydraulic fracture
and shale gas reservoir，and find out that there is a big difference in the mechanical properties between them，so they should be
taken into account separately. By using numerical simulation method，we calculate the effect of pressure-dependent permeability
and production allocationon the estimated ultimate recovery（E UR），and the results show that the effect of stress sensitivity on
shale gas reservoir is little，while the influence of hydraulic fracture stress sensitivity is stronger. If stress sensitive permeability
is only related to pressure，the production allocation has very little influence on EUR. But if under the high production rate and
with stronger permeability stress sensitivity decay curve，the initial production proration has a greater influence on EUR. With
graphics diagnosis method，we confirmed that gas wells with lower initial allocation are of greater production potential. The
research results can be used for reasonable proration optimization of high pressure shale gas wells.

Key words: shale gas, stress sensitivity, allocation, abnormal high pressure, reservoir simulation

中图分类号:

TE37

杨波1 *，罗迪2，张鑫1，吴东2，商绍芬2. 异常高压页岩气藏应力敏感及其合理配产研究[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.03.11.01.

YANG Bo1*, LUO Di2, ZHANG Xin1, WU Dong2, SHANG Shaofen2. A Study of Stress Sensitivity of Abnormal High Pressure Shale Gas#br# Reservoir and Reasonable Productivity Allocation[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.03.11.01.

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