非均匀污染水平井表皮因子确定新方法
A New Method to Determine Skin Factor of Horizontal Well with Non-Uniform Damage
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- 引用格式:
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袁淋,李晓平,陈曦,庄园,梁中红.非均匀污染水平井表皮因子确定新方法[J].天然气与石油,2016,34(3):0.doi:
Yuan Lin, Li Xiaoping, Chen Xi, Zhuang Yuan, Liang Zhonghong.A New Method to Determine Skin Factor of Horizontal Well with Non-Uniform Damage[J].Natural Gas and Oil,2016,34(3):0.doi:
- DOI:
- 作者:
- 袁 淋1 李晓平2 陈 曦1 庄 园1 梁中红1
Yuan Lin, Li Xiaoping, Chen Xi, Zhuang Yuan, Liang Zhonghong
- 作者单位:
- 1.中国石化西南油气分公司川东北采气厂，2.西南石油大学油气藏地质及开发工程国家重点实验室
1.Northeastern Sichuan Production Gas Plant of Sinopec Southwest Oil and Gas Field Co; 2.State Key Laboratory of Oil-Gas Reservoir Geology and Exploitation, Southwest Petroleum University
- 关键词:
- 水平井；非均匀污染；表皮因子；相似流动替换法；凹型递减；直线递减
Horizontal well; Non-uniform damage; Skin factor; Substitution of similar flows method; Concave type of decreasing; Linear type of decreasing
- 摘要:
- 水平井井筒附近污染带较直井更加复杂,准确计算水平井表皮因子至关重要。考虑污染带非均匀分布以及各向异性的影响,结合微元法、相似流动替换法和等值渗流阻力法得到一个确定水平井局部表皮因子以及总表皮因子的新方法。实例计算表明,考虑污染带半径沿跟端到趾端为直线递减与凹型递减的组合条件下表皮因子计算结果与不稳定试井结果相对误差最小。参数敏感性分析表明,水平井局部表皮因子以及总表皮因子均随污染带渗透率的增大而减小,而随污染带深度的增大逐渐增大。
Compared with vertical wells, the damage zone near the horizontal wellbore will be more complex and calculating the skin factor of horizontal wells accurately will be of great importance. The author considered the non-uniform distribution of damage zone and its anisotropy, combined the infinitesimal method, substitution of similar flows method and law of equivalent percolation resistance, eventually getting a simple and new model to calculate the local skin factor and total skin factor of horizontal well. Case study shows if we can consider the damage zone radius decrease as a combination way between concave way and linear way, the result by new model can have a small relative error with that calculated by method of transient well test. Parameter sensitivity analysis indicates as the increasing of depth of damage zone, the local skin factor and total skin factor also increase, while as the increasing of permeability of damage zone, the local skin factor and total skin factor decrease.
