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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第4期    总第260期    2016年4月

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文章编号:1672-7207(2016)04-1353-06
裂缝面非均匀流入的低渗透油藏压裂水平井非稳态产量计算
曾凡辉,程小昭,郭建春

(西南石油大学 油气藏地质及开发工程国家重点实验室,四川 成都,610500)

摘 要: 基于瞬时点源函数和叠加原理,考虑压裂水平井裂缝段产量非均匀流入、裂缝内变质量以及多裂缝间的相互干扰,采用空间和时间离散技术,建立低渗透油藏压裂水平井储层渗流和裂缝流动相耦合的非稳态产量计算模型。研究结果表明:以往将裂缝考虑为无限导流或者将裂缝考虑为均匀产量流入的平面径向流假设使得计算结果比实际产量偏高;在早期非稳态流动阶段,裂缝产量在井筒附近出现局部峰值,并且储层渗透率越高,裂缝导流能力越小,峰值越明显;在拟稳态生产阶段,低导流能力裂缝的流量分布趋于均匀,而高导流能力裂缝内流量分布进一步非均匀化;为了获得压裂水平井的最佳生产效果,存在与储层渗透率相匹配的最优裂缝导流能力。

 

关键字: 压裂水平井;点源函数;非均匀流入;非稳态

Calculation of unsteady productivity of fractured horizontal wells
ZENG Fanhui, CHENG Xiaozhao, GUO Jianchun

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,
Southwest Petroleum University, Chengdu 610500, China

Abstract:A dynamic model that coupled seepage in reservoir and fluid flow in fractures was built using spatial and time discrete technique in fractured horizontal well, taking into account the non-uniform flow rate of fracture segments, fracture inner variable mass flow and fracture segments mutual interference, and the solution method was also given. The results show that when regarding the inflow to the fractures as uniform and neglecting the pressure drop in the fractures, there may be higher deviation in productivity calculation of fractured horizontal well compared with actual production. In the early stage of unsteady flow, the fracture segments closer to the horizontal wellbore, the higher production of the segments, the smaller the fracture conductivity and the higher the peak. In the quasi stable production stage, the flow rate distribution of the low-conductivity fractures tends to be more uniform, while further non-uniform of the high-conductivity fractures. In order to get the best production of fractured horizontal well, there exists the optimal fracture conductivity matching with the fracture permeability.

 

Key words: fractured horizontal well; point source function; non-uniform flow; transient state

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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