基于测井资料评价煤层气井产水  

Evaluation of Water Production in Coalbed Methane Wells Based on Logging Data

作　　者：王冬冬[1] 郇志浩 刘世伟[1] 王文文 石磊 肖凌毅 WANG Dongdong;HUAN Zhihao;LIU Shiwei;WANG Wenwen;SHI Lei;XIAO Lingyi(Well Tech-China Oilfield Services Limited,Korla,Xinjiang 841000,China;Xinwen Mining Group Geological Exploration Co.,Ltd.,Xintai,Shandong 271200,China;China United Coalbed Methane Co.,Ltd.,Beijing 100016,China)

机构地区：[1]中海油田服务股份有限公司油田技术事业部,新疆库尔勒841000 [2]新汶矿业集团地质勘探有限责任公司,山东新泰271200 [3]中联煤层气有限责任公司,北京100016

出　　处：《海洋石油》2024年第4期71-76,共6页Offshore Oil

摘　　要：在煤层气开发过程中,产气量往往受产水量影响,多数高产水的井产能较低。产水量控制压降波及范围和甲烷解吸面积的大小,从而决定单井气产量高低和稳产期长短,因此准确地预测产水量就显得至关重要。根据排采过程中日产水量变化情况以及曲线形态分析,将研究区日产水量曲线分为单峰衰减型、稳产型和多峰型。不同产水类型的煤层具有不同的测井响应特征和顶底板封隔性。基于反映产水类型的关键测井参数以及顶底板封隔性的泥质含量,建立Fisher判别方程来确定产水类型。在测井资料与动态产水资料的综合研究基础上,建立不同产水类型的产水量计算方法,利用该方法计算的煤层产水量与实际产水量的吻合率在80%以上,为今后煤层的勘探开发提供了一定的技术理论基础。In the process of coalbed methane(CBM) development,gas production is often affected by water production,and the productivity of most wells with high water production is low.The amount of water production determines the range of pressure drop and methane desorption area,which determines the level of gas production and the length of stable production period of a single well.Therefore,accurate prediction of water production is crucial.According to the change of water production in the drainage process and the analysis of curve morphology,the daily water production curve in the study area is divided into single peak attenuation type,stable production type,and multipeak type.Coal seams with different water production types have different logging response characteristics and top-bottom sealing properties.Coal seams with different water production types have different logging response characteristics and sealing properties of roof and floor.Based on the key logging parameters which can reflect the water production type and the shale content of the top and bottom sealing property,Fisher discriminant equation is established to determine the water production type.Based on the comprehensive study of logging data and dynamic water production data,the calculation method of water production for different water production types is established.The coincidence rate between the calculated water production of coal seam and the actual water production is more than 80%,which provides a certain technical and theoretical basis for the exploration and development of coal seam in the future.

关 键 词：煤层气 测井资料 单峰衰减型 多峰型 电阻率 泥质含量 产水量 

分 类 号：P631.81[天文地球—地质矿产勘探]