›› 2014, Vol. 35 ›› Issue (2): 1-1.

• 论文 •    

分段压裂水平井压力动态分析及特征值方法

王军磊1,位云生1,陈 鹏2a,韩会平2a,黄有根2b,2c   

  1. (1. 中国石油 勘探开发研究院,北京 100083;2. 中国石油 长庆油田分公司 a.技术发展处,b.勘探开发研究院,c.低渗透油气田勘探开发国家工程实验室,西安 710021)
  • 出版日期:2019-01-01 发布日期:1905-07-11

Transient Pressure Behavior Analysis and Direct Synthesis Technique for Horizontal Well Intersected by Finite Conductivity Fractures

WANG Junlei1 , WEI Yunsheng1 , CHEN Peng2a , HAN Huiping2a , HUANG Yougen2b,2c   

  1. (1. Research Institution of Petroleum Exploration & Development, PetroChina, Beijing 100083, China2. PetroChina Changqing Oilfield Company, a.Technological Development Department, b.Research Institution of Exploration & Development, c.National Engineering Laboratory for Exploration & Development of LowPermeability Oil & Gas Fields, Xian, Shaanxi 710021, China)
  • Online:2019-01-01 Published:1905-07-11

摘要: 基于渗流数学模型,推导动态有限导流因子模拟裂缝内的变质量流动规律,利用拉普拉斯变换及压降叠加原理研究裂缝之间的相互干扰,建立以各裂缝产量及井筒压力为变量的线性方程组。通过数值反演-数值迭代确定气井压力动态,划分出(双)线性流、早期线性流、早期径向流、复合线性流及复合径向流等5个特征流动段,同时利用渐进分析和等效井径原理给出对应的压力及导数近似表达式,结合特征值法原理,计算地层渗透率、裂缝长度、导流能力、表皮因子等参数,形成适用于分段压裂水平井的特征值方法。

Abstract: In the model of horizontal well intersected by finite conductivity fractures (HWFCF), a dynamic factor was derived to simulate the characteristic of flowing in fracture. Pressure superposition principle was incorporated to deal with the interaction of fractures in Laplace transform. Production rates from fractures and wellbore pressure constituted the system of linear equations which could be solved by utilizing stehfest numerical inversion and numerical iteration method. The result shows that the whole flow duration can be divided into five segments: bilinear flow, linear flow, radial flow, compound linear flow and compound radial flow. Meanwhile, the approximate expressions of pressure and derivative in different segments were presented based on the equivalent wellbore radius and asymptotic approximation. Applying the principle of Tiab’s direct synthesis technique to the case of HWFCF, formation permeability, facture length, finite conductivity,distance and skin factors were calculated without using the type curve matching procedure or regression

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