Abstract: The scattered wellhead gas has the characteristics of many sites, scattered well field distribution, and wide distribution area. In the process of oil and gas field production, because of small volume of the wellhead gas, fast decay of the output, the investment of pipeline transportation is too high, and the economic efficiency is low. Most of this kind of gas are directly discharged or burnt on site, wasting precious resources and polluting the environment. Aiming at the characteristics of the wellhead, a set of modular and skid-mounted movable units was developed to purify the natural gas from the wellhead and, combining the throttle expansion refrigeration with the refrigerant refrigeration, to separate the mixed hydrocarbons and recover the C3, C4, C5+ . They can be processed into qualified natural gas, as a commercial gas being pressurized and put into the downstream pipeline or CNG tanker to be transported to other places. The mixed hydrocarbons after stabilization can be transported to other places by pressure tank cars, further being processed into liquefied petroleum gas and/ or stable light hydrocarbons, so as to realize the economic, social, and environmental benefits of the scattered wellhead gas resources in oil and gas fields.

摘要： 零散井口气具有站点多、井场布置分散、分布区域广的特点。在油气田生产过程中, 由于井口气量小、 产量衰减快, 利用管输方式投资过高、经济效益低, 大多被直接排放或燃烧, 既浪费资源, 又污染环境。针对上述井 口的特点, 开发出一套模块化、橇装化的可移动装置, 对井口天然气进行净化处理, 采用节流膨胀制冷、冷剂制冷结 合的方法, 分离出混烃并回收其中的C3、C4、C5 + , 处理合格的天然气, 可以作为商品气可增压进入下游管输或CNG 槽车外运, 稳定后的混烃采用压力储罐车外运, 进一步处理成液化石油气和稳定轻烃, 从而实现油气田零散井口气资 源的经济效益、社会效益和环保效益。

关键词: 零散气, 回收利用, 橇装化, 快速搬迁