摘要
中国大多数煤层气藏具有低压、低渗、低饱和等特点,采用常规增产改造和降压开发技术难于奏效。文章提出了高温、高压注气技术开发该类低渗煤层气藏,研究表明,煤层甲烷解吸—扩散—渗流过程受多种因素影响,在煤层气开发中,一方面需要提高煤层渗透率,另一方面还必须促进甲烷高效快速解吸。高温、高压注气开发煤层甲烷的机理是用超破裂压力注气来诱发双孔裂隙形成和天然裂缝延伸,降低甲烷分压,提高气体与煤的接触面,以增加甲烷的解吸,然后通过分孔高压注气、抽放,形成压力降,以加快游离甲烷的扩散、渗流。
Most coalbed methane reservoirs have the characteristics of low voltage, low permeability and low saturation, which can＇t use the conventional way of the production technology and pressure release development technology. The article proposes the injection gas technology in high temperature and high pressure. The research shows that many factors will affect in the coal--bed methane desorption -- the spread percolation process. In according of this, on the one hand needing to improve coal permeability, On the other hand also needing to promote methane desorption efficiently, the mechanism of develop coal --bed methane using the injection gas technology in high temperature and high pressure is to induce a double fracture and a natural extension of cracks by injecting gas in ultra--pressure, in order to reduce methane pressure, increase contact surface between CO2, N2 and coal,increase the desorption of methane, then form a pressure drop through a hole high pressure injection gas, drainage, , in order to speed up the spread and seepage of the free methane.
出处
《内蒙古石油化工》
CAS
2008年第14期22-23,共2页
Inner Mongolia Petrochemical Industry
关键词
渗透率
吸附
解吸
高温
高压
Permeability
Absorption
Desorption
High temperature
High Pressure
