克拉美丽气田水淹气井气举硬举动态模拟

气举因其适应性强,工艺灵活,广泛用于产水气井排液采气或水淹气井复产,但其卸载过程较为复杂,其卸载方式或工艺参数多凭经验确定,尤其对于气举硬举工艺。为此,基于动量守恒和质量守恒建立了气举硬举卸载过程数学模型,并利用有限差分方法对模型进行了求解。以克拉美丽气田水淹井DX180X井为例,采用气举硬举方式,考虑氮气气举和天然气气举,分别采用正、反举方式进行卸载动态模拟,分析了影响卸载的各因素,如注氮气或天然气,正、反举方式等,模拟了卸载过程中井口压力、井底压力等随时间的变化情况。为降低启动压力及减少井筒液体回流时间或回流量,推荐采用注氮气正举方式卸载,对于深井、地层压力较高或需连续油管气举硬举的水淹井尤为适用。通过实例模拟与分析为气举硬举的可行性研究、工艺设计及压缩机选择等提供了参考。

What Can We Learn from Hard Ball？. Application of Politics in K-12 School Board Election

Hard Ball by Chris Matthews is a great book offering fascinating anecdotes of various people seeking political power： their ambitions, the brutality of politics and their skillful maneuverings of political schemes. This essay utilizes a hypothetical scenario, how to get ele,：ted to local school boards, to illustrate how politics is played at the local level. I chose this scenario is because all politics are local and school board can influence schools, teachers and students on a daily basis.