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滇东老厂区块煤层气井峰值产气量主控地质因素分析
供稿: 康刘旭;胡滨;康永尚;曾雯婷;王伟洪;顾骄杨;田博凡 时间: 2022-05-10 次数:

康刘旭, 胡滨, 康永尚,.滇东老厂区块煤层气井峰值产气量主控地质因素分析[J].河南理工大学学报(自然科学版),2022,41(3):38-47.

KANG L X,  HU B, KANG Y S,et al.Analysis on controlling geological factors for peak gas production of CBM wells in Laochang blcokeastern Yunnan Province[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(3):38-47.

滇东老厂区块煤层气井峰值产气量主控地质因素分析

康刘旭1, 胡滨2, 康永尚1,3, 曾雯婷4, 王伟洪5, 顾骄杨2,6, 田博凡1

1.中国石油新疆油田开发公司研究所,新疆 克拉玛依 834000;2.中联煤层气有限责任公司,北京 100011;3.中国石油大学(北京) 油气资源与探测国家重点实验室,北京 102249;4.中石油煤层气有限责任公司,北京 100028;5.北京油源恒业科技有限公司,北京 102200;6.中海石油(中国)有限公司非常规油气分公司,北京 100011

摘要:基于滇东老厂区块6口排采先导试验井的煤层气地质资料和排采动态资料,在分析产水和产气特征基础上,探讨老厂区块影响煤层气井排采效果的主控地质因素和影响机理,并提出主控地质因素的下限指标和井层选择建议。结果表明:(1)单井动用资源丰度、动用煤层的平均含气饱和度和平均渗透率是煤层气井峰值产量的3个主控地质因素,它们共同控制着煤层气井的峰值产气量;(2)动用煤层的含气饱和度通过控制见气时的井底流压降低幅度影响见气时和见气后的动态渗透率,从而对峰值产气量产生影响,较高的含气饱和度有利于在较低的井底流压降低幅度时见气,有利于保持较高的动态渗透率,从而有利于气体产出,实现较高的峰值产气量;(3)在老厂区块低渗透煤储层条件下获得较高峰值产气量(大于600 m3/d)的单井动用资源丰度下限,为1 ×108 m3/km2,平均含气饱和度下限为70%,平均渗透率下限为 0.08 mD;若平均含气饱和度达到90%以上,则平均渗透率的下限可降为0.03 mD。建议老厂区块今后在井层优选时规避断层影响,即在构造模型指导下选择远离断层的井位;在选择合层排采煤层组合时,将动用资源丰度1 ×108 m3/km2作为下限,动用煤层的平均含气饱和度70% 作为下限,平均渗透率0.08 mD作为下限。

关键词:老厂区块;合层排采;峰值产气量;单井动用资源丰度;平均含气饱和度;平均渗透率

doi:10.16186/j.cnki.1673-9787.2020100027

基金项目:国家科技重大专项项目(2016ZX05044-005

收稿日期:2020/10/14

修回日期:2021/01/19

出版日期:2022/05/15

Analysis on controlling geological factors for peak gas production of CBM wells in Laochang blcokeastern Yunnan Province

KANG Liuxu1,  HU Bin2, KANG Yongshang 1,3, ZENG Wenting4,  WANG Weihong 5, GU Jiaoyang2,6, TIAN Bofan1

1.Research Institute of China National Petroleum Corporation Xinjiang Oilfield Development Company ,Karamay 834000 , Xinjiang, China ;2.China United Coalbed Methane Co. , Ltd. , Beijing 100011 , China ;3.State Key Laboratory of Petroleum Resources and Prospecting of China University of Petroleum ( Beijing) ,Beijing 102249 , China ;4.Petro China Coalbed Methane Co. , Ltd. , Beijing 100028 , China ;5. Beijing Youyuan Hengye Technology Co. , Ltd. , Beijing 102200 , China;6.Unconventional Oil & Gas Branch , China National Offshore Oil Corporation, Beijing 100011 , China

Abstract:Based on the geological data and dynamic data of CBM from six pilot wells in the Laochang block on the basis of the analysis of water and gas production characteristicsthe main geological factor sand influencing mechanism that influenced the coalbed methane drainage effect in the Laochang block were disscussed , and the lower limit index of the main geological factors and suggestions for well layer selection were put forward. The results showed that:(1)The producing resource abundance ,the average gas saturation and the average permea- bility of the coal seam were the three main geological factors controlling the peak gas production;The three factors worked together to control the peak production of coalbed methane;(2)Gas saturation affected the dynamic permeability at and after gas breakthrough by controlling the reduction of bottom hole flow pressure at gas breakthrough , which had an impact on peak production. Higher gas saturation was conducive to gas break- through at lower bottom hole flow pressure reduction , and was conducive to maintaining higher dynamic permeability ,which conducive to gas production and achieving higher peak gas production; (3 ) Under the background of low permeability coal reservoir in the Laochang block, the lower limit of production resource abundance was 1 x108 m3/km2 , the lower limit of gas saturation was 70% ,and the lower limit of permeability was

0.08 mD.If the gas saturation reached more than 90% , the lower limit of permeability could be reduced to 0.03 mD. It was suggested that in the future , when optimizing the well layers in the old plant area,it was needed to avoid the influence of faults,and under the guidance of the structural model , to select the well positions far away from faults; When selecting the multi-seam drainage and mining coal seams, the abundance of produced resources of 1 x108 m3/km2 should be taken as the lower limit,taking the average gas saturation of produced coal seams of 70% should be taken as the lower limit,and the average permeability of 0.08 mD should be taken as the lower limit.

Key words:Laochang block;multi-seam drainage;peak gas production;producing resource abundance;average gas saturation;average permeability

  滇东老厂区块煤层气井峰值产气量主控地质因素分析_康刘旭.pdf

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