煤层气井抽排/恢复试井方法在低压煤储层中的应用研究  

Study on Application of Drainage/Pressure Build up Well Test Method of CBM Well in Low Pressure Coal Reservoir

作　　者：孙晓光 王令波 张庆丰 李娜娜 李子玲 赵刚 左运 SUN Xiaoguang;WANG Lingbo;ZHANG Qingfeng;LI Nana;LI Ziling;ZHAO Gang;ZUO Yun(PetroChina Coalbed Methane Company Limited Xinzhou Gas Production Management Area,Taiyuan 030000,China)

机构地区：[1]中石油煤层气有限责任公司忻州采气管理区,太原030000

出　　处：《煤炭技术》2023年第8期113-116,共4页Coal Technology

基　　金：国家科技重大专项(2016ZX05042)。

摘　　要：目前常用的注入/压降试井和DST测试在欠压储层中均存在一定的问题,无法取得准确的储层参数。而抽排/恢复试井方法通过控制产量和井底流压可以在低饱和度欠压储层中取得更大探测半径内的储层物性参数。针对该问题,提出了抽排/恢复试井的施工参数计算方法,及采用RTTS封隔器+可以开关井的井下管式泵的管柱结构来控制井底流压,防止出现气水两相流和减小井储系数的测试方法,并以鄂尔多斯东缘BD-01井为例,结合多次开关井的反褶积解释方法的应用,验证了抽排/恢复试井方法在低压、低饱和储层中的适用性和可靠性。At present,the commonly used injection/fall well test and DST test have certain problems in low pressure coal reservoir,and accurate reservoir parameters cannot be obtained.By controlling production and bottom hole flowing pressure,the drainage/pressure build up well test method can obtain reservoir parameters within a larger detection radius in low saturation and low pressure coal reservoir.In order to solve this problem,the calculation method of drainage/pressure build up well test construction parameters is proposed,and the test method of using RTTS packer and tubing pump string structure that can switch wells to reduce well storage coefficient is proposed.Taking BD-01 well in the eastern margin of Ordos as an example,combined with the application of deconvolution interpretation method of multiple switching wells,the applicability and reliability of drainage/pressure build up well test method in low pressure and low saturation reservoirs are verified.

关 键 词：抽排/恢复试井 低压煤储层 低饱和度 临界解吸压力 

分 类 号：TE373[石油与天然气工程—油气田开发工程] TD712.6[矿业工程—矿井通风与安全] P618.13[天文地球—矿床学]