基于不同压力体系下煤系气合采工艺的适用性研究  

Adaptability study on co-mining technique of coal measures gas based on different pressure system

作　　者：张晧 綦耀光[1] 张芬娜[1] 朱森 孟尚志[2] 张健[2] ZHANG Hao;QI Yaoguang;ZHANG Fenna;ZHU Sen;MENG Shangzhi;ZttANG Jian(School of Mechanical and Electrical Engineering, China University of Petroleum, Qingdao 266580, China;China United Coalbed Methane Company Limited,Beijing 100011, China)

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580 [2]中联煤层气有限责任公司,北京100011

出　　处：《煤炭科学技术》2017年第12期194-200,共7页Coal Science and Technology

基　　金：国家科技重大专项资助项目(2016ZX05066004-002;2017ZX05042003-001);中央高校基本科研业务费专项资金资助项目(16CX02004A)

摘　　要：为了提高非常规油气生产的经济效益,通过对部分地区的叠置型煤系气进行合采作业以提高其产量,因合采过程中不当的工艺会产生较为严重的层间干扰现象,为此开发出适用于煤系气合采作业的工艺,据压力体系不同将合采工艺分为同压力体系合采、分压力体系合采及负压合采等工艺,利用GRAY压降模型及伯努利方程得出了3种工艺相应的合采地层条件,结合不同类型煤系气组合地层特征,分析各类叠置煤系气地层所适用的合采工艺,提出了不同压力体系下合采工艺的适用条件。研究结果表明:不同煤系储层下压降梯度的差异显著将导致同压力体系合采工艺在煤系气合采作业过程中限制较大;负压合采工艺的地层要求较为苛刻,只适用于高产气低产水的煤系气合采组合;分压力体系合采工艺适用性较强,在合理构建井下空间的基础上满足任意情况下的煤系气合采作业。In order to improve the economic benefit of the non conventional oil and gas production, a co-mining operation was .onducted in the overlay type coal measures gas stratum in a part area to improve the production. During the co-mining process,a improper tc.h.iquc would possibly cause a serious interference phenomenon between the strata. In order to study the technical features suitable to the coal measures gas co-mining operation,according to the different pressure system,the co-mining technique couhl be divided to a co-mining technique with a same pressure system,a co-mining technique with a different pressure system and the co-mining lechnique with a nega- tive pressure system and in combination with a GRAY Pressure Drop Model and the Bernoulli Equation,the relevant co-mining condition suitable to the three techniques was obtained. With the different type coal measures gas combined strata features, the paper had an analysis on the suitable co-mining technical features of each overlay coal measures gas stratum and provided suitable analysis on Ihe co-mining technique under different pressure system. The study results showed that under the different coal measures reservoir, the obvious differencce of the pressure drop gradient would cause the co-mining technique with the same pressure system couhl have a high application restriction in the coal measures gas co-mining operation process. The strata requirements of the negative pressure co-mining lechnique would be drastic and would be only suitable for the combination of the high gas production and low water production i：oal measures gas co-miuing. The co-mining technique with different pressure system would be high and based on the rational construction of the underground spae and could ensure the co-mining operation of the coal measures gas under the any condition.

关 键 词：煤系气 合采特征 同压力体系合采 分压力体系合采 

分 类 号：TE133[石油与天然气工程—油气勘探]