新疆地区不同产水程度煤层气井排采动态与产能特征  

Drainage Performance and Productivity Characteristics of Coalbed Methane Wells with Different Water Production Levels in Xinjiang

作　　者：陈文圆 葛燕燕 孔庆虎 杨曙光 李鑫 张娜 韦波 王刚 王兴刚 苏红梅 CHEN Wenyuan;GE Yanyan;KONG Qinghu;YANG Shuguang;LI Xin;ZHANG Na;WEI Bo;WANG Gang;WANG Xinggang;SU Hongmei(Key Laboratory of Continental Dynamics and Mineralization Prediction of Central Asian Orogenic Belt,Xinjiang University,Urumqi,Xinjiang 830017;Geological Exploration Institute,the First Exploration Bureau,CNACG,Handan,Hebei 056004;CBM Research and Development Center of Xinjiang Coal Geological Bureau,Urumqi,Xinjiang 830091;Xinjiang Yaxin Coalbed Methane Investment and Development(Group)Co.,Ltd,Urumqi,Xinjiang 830009;Research Institute of Exploration and Development,Tuha Oilfield Company,PetroChina,Hami,Xinjiang 839009;Xinjiang Uygur Autonomous Region Coalfield Geology Bureau 156 Coalfield Geological Exploration Team,Urumqi,Xinjiang 830047)

机构地区：[1]新疆大学,新疆中亚造山带大陆动力学与成矿预测自治区重点实验室,新疆乌鲁木齐830017 [2]中国煤炭地质总局第一勘探局地质勘查院,河北邯郸056004 [3]新疆维吾尔自治区煤田地质局煤层气研究开发中心,新疆乌鲁木齐830091 [4]新疆亚新煤层气投资开发(集团)有限责任公司,新疆乌鲁木齐830009 [5]中国石油吐哈油田分公司勘探开发研究院,新疆哈密839009 [6]新疆维吾尔自治区煤田地质局一五六煤田地质勘探队,新疆乌鲁木齐830047

出　　处：《地质与勘探》2025年第2期407-419,共13页Geology and Exploration

基　　金：国家自然科学基金项目(编号:42062012);国家科技重大专项(编号:2024ZD14060000);新疆维吾尔自治区重点研发计划(编号:2024B01017-2);新疆维吾尔自治区天山英才项目(编号:2023TSYCLJ0005、2022TSYCLJ0021)联合资助。

摘　　要：水文地质条件对煤层气的富集和产出具有重要影响。针对新疆地区不同产水程度煤层气井产能差异的问题,利用统计分析和数值模拟等手段,将煤层气井划分为低产水煤层气井、中产水煤层气井和高产水煤层气井三类。将累计排采500天、平均日产水量低于5m^(3)的煤层气井,划分为低产水煤层气井。该类井压力下降幅度适中(CS18井压力下降幅度51.56%),压降解吸范围受限,供气面积小。将平均日产水量介于5~10m^(3)的煤层气井划分为中产水煤层气井,该类井压力下降幅度适中(BCS-22井压力下降幅度53.67%),少见产水量过大需要长期排水无法解吸的情况。将平均日产水量高于10 m^(3)的煤层气井划分为高产水煤层气井,该类井压力下降幅度较小(T1-6井压力下降幅度30.42%),排水降压困难。进一步提出了低产水煤层气井“合理控水、适当憋压”、中产水煤层气井“连续排采、稳水稳压”和高产水煤层气井“低套压、高流压日降幅”的排采建议。该研究可为新疆不同产水程度煤层气井长期高效开发提供依据。Hydrogeology exerts a major effect on the enrichment and productivity of coalbed methane(CBM).In view of the productivity difference in CBM wells with different water production levels in Xinjiang,this work conducted statistical analysis and numerical simulation to divide the CBM wells into three types,i.e.,low water-producing,medium water-producing and high water-producing CBM wells.Those wells with an average daily water production of<5 m^(3) for 500 days were classified as low water-producing wells.This type of wells has a moderate pressure drop(the pressure drop of the well CS18 is 51.56%),a limited range of pressure degradation and absorption,and the gas supply area is small.The CBM wells with an average daily water production of 5~10 m^(3) are divided into medium water-producing wells.These wells have a moderate pressure drop(the pressure drop of the well BCS-22 is 53.67%),and rarely encounter the situation that the water production is too large to be desorbed by long-term drainage.CBM wells with an average daily water production of more than 10 m^(3) are classified as high-yield wells.The pressure drop of such wells is small(the pressure drop of wells T1-6 is 30.42%),and the drainage and pressure reduction are difficult.Further suggestions were put forward for the CDM wells,including"reasonable water control and appropriate pressure holding"for low water-producing wells,"continuous production and stable water and pressure"for medium water-producing wells,and"daily decrease in low casing pressure and high flow pressure"for high water-producing wells.This study can provide a basis for the long-term and efficient development of CBM wells with different water production levels in Xinjiang.

关 键 词：煤层气 储层排采 产水量 井底流压 排采制度 新疆 

分 类 号：TE132[石油与天然气工程—油气勘探]