鄂尔多斯盆地东缘三区块煤层气井产能主控因素及开发策略

doi:10.7623/syxb201711010

石油学报 ›› 2017, Vol. 38 ›› Issue (11): 1310-1319.DOI: 10.7623/syxb201711010

鄂尔多斯盆地东缘三区块煤层气井产能主控因素及开发策略

赵欣¹, 姜波², 张尚锟³, 刘杰刚², 段飘飘², 徐强¹

1. 中国煤炭地质总局勘查研究总院北京 100039;
2. 中国矿业大学资源与地球科学学院江苏徐州 221116;
3. 中石油煤层气有限责任公司陕北项目经理部陕西延安 716000

收稿日期:2017-01-16 修回日期:2017-08-20 出版日期:2017-11-25 发布日期:2017-12-08
通讯作者: 赵欣,女,1986年6月生,2008年获西安石油大学学士学位,2017年获中国矿业大学博士学位,现为中国煤炭地质总局勘查研究总院工程师,主要从事煤层气勘探开发研究工作。Email:zx20091020@163.com
作者简介:赵欣,女,1986年6月生,2008年获西安石油大学学士学位,2017年获中国矿业大学博士学位,现为中国煤炭地质总局勘查研究总院工程师,主要从事煤层气勘探开发研究工作。Email:zx20091020@163.com
基金资助:
国家重大科技专项"煤层气储层工程及动态评价技术"（2011ZX05034）和中国煤炭地质总局勘查研究总院青年科技创新基金资助。

Main controlling factors of productivity and development strategy of CBM wells in Block 3 on the eastern margin of Ordos Basin

Zhao Xin¹, Jiang Bo², Zhang Shangkun³, Liu Jiegang², Duan Piaopiao², Xu Qiang¹

1. General Prospecting Institute, China National Administration of Coal Geology, Beijing 100039, China;
2. School of Resources and Geoscience, China University of Mining and Technology, Jiangsu Xuzhou 221116, China;
3. Project Management Department in Northern Shaanxi, PetroChina Coalbed Methane Company Limited, Shaanxi Yan'an 716000, China

Received:2017-01-16 Revised:2017-08-20 Online:2017-11-25 Published:2017-12-08

摘要/Abstract

摘要：

根据鄂尔多斯盆地东缘三区块煤层气田83口排采井的资料，系统分析了地质条件、工程技术和排采制度等因素对煤层气井产能的影响，并在此基础上提出了相应的开发策略。结果表明：煤层厚度、地下水流体势、含气量、渗透率和临储比是影响研究区煤层气井产能的主要地质因素；井距、压裂液量和加砂量是影响煤层气井产能的主要工程技术因素；井底压力下降速度、动液面下降速度、套压直接影响煤层气井产能。在此基础上，采用灰色关联分析法得出研究区煤层气井产能影响因素的大小次序，并从有利区优选、井网部署、压裂设计和排采制度4个方面，提出了适合于研究区煤层气地质特征的开发策略：在有利区优选方面，构建了煤层气开发有利区评价指标，将研究区划分为I—Ⅳ类单元；在井网部署方面，I类和Ⅱ类单元井距应控制在335~370 m；Ⅲ类和Ⅳ类单元井距应控制在370~400 m；在压裂施工设计方面，I类和Ⅱ类单元煤层气井的压裂液量应控制在800~1 200 m³；加砂量应控制在35~60 m³；Ⅲ类和Ⅳ类单元煤储层地质条件相对较差，对于不同地质条件，提出了不同的压裂措施；排采制度方面，将煤层气排采产气过程划分为5个阶段，并针对不同排采阶段，提出了具体的排采控制方法。

关键词: 煤层气, 产能主控因素, 灰色关联分析, 调控方法, 开发策略

Abstract:

According to the production data of 83 coalbed methane(CBM) wells in Block 3 on the eastern margin of Ordos Basin, the effects from geological conditions, engineering technology, draining technology and other factors on CBM well productivity were systematically analyzed, and on this basis, the relevant development strategies were put forward. The results show that the main geological factors influencing CBM productivity include coal bed thickness, underground water fluid potential, gas content, permeability and critical reservoir ratio. The major engineering technology factors affecting CBM productivity include well spacing size, total fracturing liquid volume and sand adding amount. The lowering speeds of bottom hole pressure and working fluid level as well as casing pressure directly influence CBM productivity. On this basis, gray relative analysis method is used to obtain the degree order of CBM productivity influencing factors in the study area. Meanwhile, from the four aspects including favorable zone optimization, well pattern deployment, fracturing design and producing measures, the development strategies suitable for CBM geological characteristics in the study area were put forward as follows. In the aspect of favorable zone optimization, the evaluation indicators for favorable CBM development zone were established to divide the development unit into Ⅰ-Ⅳ units types. In the aspect of well pattern deployment, the well spacing sizes of Type I and Type Ⅱ units should be controlled within 335-370 m, and those of Type Ⅲ and Type IV units should be limited in 370-400 m. In the aspect of fracturing design, the fracturing liquid volumes of Type I and Type Ⅱ units should be controlled in 800-1 200 m³, and the sand adding amount should be limited within 35-60 m³. Due to poorer coalbed geological conditions of Type Ⅲ and Type IV units, different fracturing measures were proposed for different geological conditions. In the aspect of producing measures, the CBM producing process in the study area was divided into five stages, and the specific CBM-producing controlling methods are put forward aiming at different producing stages.

Key words: coalbed methane, main controlling factors of productivity, gray relative analysis, regulatory method, development strategy

中图分类号:

TE33

赵欣, 姜波, 张尚锟, 刘杰刚, 段飘飘, 徐强. 鄂尔多斯盆地东缘三区块煤层气井产能主控因素及开发策略[J]. 石油学报, 2017, 38(11): 1310-1319.

Zhao Xin, Jiang Bo, Zhang Shangkun, Liu Jiegang, Duan Piaopiao, Xu Qiang. Main controlling factors of productivity and development strategy of CBM wells in Block 3 on the eastern margin of Ordos Basin[J]. Acta Petrolei Sinica, 2017, 38(11): 1310-1319.

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鄂尔多斯盆地东缘三区块煤层气井产能主控因素及开发策略

Main controlling factors of productivity and development strategy of CBM wells in Block 3 on the eastern margin of Ordos Basin

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