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我国煤层气资源丰富，但是绝大部分渗透率低。目前，国外低渗煤层主体开发技术主要有两种，一是直井射孔压裂技术，二是定向羽状水平井技术。文章对樊庄区块开发3＃煤煤层气采用直井射孔压裂和定向羽状水平井技术设计的4套方案进行了经济评价，认为定向羽状水平井方案经济效益高，但国内没有应用羽状水平井开发煤层气的先例，风险较大。建议尽快开展定向羽状水平井先导性试验。直井压裂方案效益低于羽状水平井方案，但压裂工艺技术成熟，风险小。

STATISTICAL ANALYSIS OF CHINESE PETROLEUM TECHNICAL PERIODICALS AND PAPERS CITED BY EI

The resource of coal bed gas is rich in China. But most of the reservoirs are low permeable. At present, there are 2 exploitation techniques for low permeable coal bed gas reservoirs abroad. One is the perforating and fracturing technique with vertical well. Another is the technique of directional feather horizontal drilling. The economic evaluation is conducted for the 4 programs designed to exploit No. 3 coal bed gas with the perforating and fracturing technique with vertical well and the technique of directional feather horizontal drilling. It is thought the program to apply the technique of directional feather horizontal drilling has better economic benefit. But the technique hasn’t been used in China before. The risk is higher. So, it is suggested to conduct the pilot experiment of directional feather horizontal drilling as soon as possible. The program to apply the perforating and fracturing technique with vertical well has lower economic benefit. But the fracturing technique is mature and has less risk.