苏里格气田排水采气技术进展及对策

Progress in Drainage Gas Recovery Technologies and Management Countermeasures for Sulige Gasfield

苏里格气田属于典型的"三低"气田,气井投产后产气量、压力下降快,气井携液能力不足,随着生产时间的延长,气田积液气井逐年增多且达到了区块总井数的60%,井底积液也愈发严重,确保气井产能发挥与解决井筒积液问题之间的矛盾日益突出。以苏里格气田中部苏6、苏36-11等6个区块排水采气工艺技术推广试验应用为例,针对泡沫排水、速度管柱、柱塞气举、气举复产等排水采气工艺技术,从技术进展、适用性分析、实施效果、工艺评价等方面进行总结分析,明确了气井不同生产阶段排水采气工艺措施,建立了排水采气工作流程,历年累计增产气量突破7×108 m3。通过技术应用评价探索出低压低产气井排水采气工艺方法,形成了苏里格气田排水采气工艺技术系列,对气田产水气井的开发管理提供指导。

Sulige gasfield is a typical one characterized by low yield, low pressure, and low abundance. The production rate and pressure decreased rapidly with deficient capability of fluid carrying in some wells after putting into production. Along with the continued development, many liquid-loading gas wells increased yearly and up to 60% of the total numbers of wells. A contradiction between productivity ensuring and liquid-loading problem solving is getting more and more serious. In this study, drainage gas recovery technologies were applied to 6 blocks including Su 6 and Su 36-11 in central Sulige gasfield. Some technologies including foam drainage, velocity string, plunger gas lift, and restoring production by gas lift were analyzed in terms of their progress, applicability, implementation effect, and process evaluation. As the result, the drainage gas recovery technologies suitable for different production phases were determined, and their workflows established. The accumulative increases in gas production over the years exceeded7 ×10~8 m^3. Formed by application evaluation, the serial technologies of drainage gas recovery for low-pressure and low-yield wells can provide guidance for the development and management of water-producing gas wells in Sulige gasfield.