水基泥浆污染下流度转渗透率的校正方法  

A correction method of transforming mobility polluted by water-based mud to permeability

作　　者：石磊 冯进 管耀 SHI Lei;FENG Jin;GUAN Yao(Research Institute of Shenzhen Branch,CNOOC,Shenzhen,Guangdong 518000,China)

机构地区：[1]中海石油有限公司深圳分公司研究院,广东深圳518000

出　　处：《油气井测试》2021年第1期9-15,共7页Well Testing

基　　金：“十三五”国家科技重大专项课题“南海东部海域勘探领域及关键技术”(2016ZX05024-004)。

摘　　要：南海东部海域珠一坳陷电缆地层测试受水基泥浆侵入影响,近井带储层产生固阻效应,导致流度结果无法定量评价储层渗透率。结合岩心实验分析和区域实际测试资料,建立岩心渗透率损害比判别污染程度的标准,根据污染程度的不同建立三类岩心污染校正模型。在此基础上,利用地层测压测试的压差、压力恢复斜率构建渗透率损害比,解决了无岩心井流度污染识别难的问题。应用测压流度污染评价技术,对油区试油井电缆地层测试流度进行校正,校正后流度转渗透率的相对误差降低了20%以上。以2口典型实例井进行验证,解释结果与现场动态、静态资料吻合度较高。该研究为储层污染定量识别提供了新的思路,为取样、测试作业提供技术支持。It is impossible to quantitatively evaluate the permeability of the reservoir with the fluidity results because of a solid resistance effect of the reservoir near the well zonecaused by the influence of the invasion of water-based mud when wireline formation testing in Zhuyi depression of the eastern South China Sea.Combining with the core experimental analysis and regional actual testing data,the standard to judge pollution degree with damage ration of the core permeability was established,and pollution correction model for three core types with different pollution degree was established.On this basis,construct the permeability damage ratio with pressure difference and slope of pressure recovery data from formation pressure test,which solves the problem of difficulty in identifying the mobility pollution of coreless wells.Using evaluation technology of fluidity pollution from pressure test,correct the wireline formation testing mobility of oil testing well in oil block.After correction,the relative error transforming fluidity to permeability was reduced by more than 20%.Two typical example wells were used for verification,and the interpretation results were in good agreement with the on-site dynamic and static data.This research provides new ideas for quantitative identification of reservoir pollution and provides technical support for sampling and testing operations.

关 键 词：电缆地层测试 DST测试 流度 渗透率 动态资料 静态资料 污染校正 

分 类 号：TE51[石油与天然气工程—油气田开发工程]