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水平井负压钻井渗透率剖面计算模型影响参数
石油与天然气地质
2009年 30卷 第No.3期
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Title
An analysis on influential parameters for modeling permeability profile during underbalanced drilling in horizontal wells
Authors
Lu Hongyou
Chen Xiaohong
Huang Handong
摘要
负压钻井可减小甚至避免钻井液侵入污染,近年来越来越得到重用。实际工作中,为准确调整钻井液配比以确保井底压力低于油藏压力,需准确估算沿井筒流入的液量,而渗透率剖面是计算流量的重要参数。通过推断导出一个渗透率剖面计算模型,并应用数值模拟器对其进行验证,同时对相关参数,如地层非均质性、地层压力、钻速等进行了敏感性分析。计算结果表明该模型有一定的适用性。
Abstract
Underbalanced drilling can reduce or even eliminate formation damage from drilling fluid invasion,and therefore,it is getting more and more popular.To ensure that the bottom hole pressure is lower than the re-servoir pressure,it is essential to adjust the gas fraction of the drilling fluid and to accurate inflow calculations.The permeability profile is an important parameter to calculate inflow.We have derived a model for calculating permeability profile and proved it by applying numerical simulator.Parameters such as formation heterogeneity,formation pressure and drilling rate were studied in this paper.The results show that the model is applicable in certain areas.
关键词：
射孔长度;
渗透率剖面计算模型;
负压钻井;
水平井;
Keywords:
perforation length;
model for calculating permeability profile;
underbalanced drilling;
horizontal well;
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