涩北气田气举工艺的研究及应用

Gas lift and its application to Sebei gasfield

为了形成与柴达木盆地主力气田气水同采阶段相配套的排采工艺技术,以涩北气田第四系疏松砂岩气藏为研究对象,在综合分析气田开发现状的基础上,开展气举工艺技术研究。通过对气举方式选择、管流模型优选、管柱尺寸、气举参数、气举设备、地面流程等方面的系统研究,形成了单井撬装间歇和多井连续集中增压的多样化气举配套技术。研究结果表明:①气举技术井筒工艺无机械部件,很适合涩北气田出砂出水气井;②撬装气举灵活性强,适合井筒水淹气井的排水,集中增压气举自动化程度高,可规模化、多井同时排水,适合产层水淹的气井;③单井撬装间歇气举和多井连续集中增压气举的工艺相互补充,实现了"点和面"的全覆盖,可满足涩北气田的排水需求,将成为该气田开发中后期的重要治水手段。

In order to develop technologies of drainage gas recovery suitable for gas- and water-producing stage, this paper took the Quaternary unconsolidated sandstone gas reservoirs in Sebei gasfield, Qaidam Basin, as examples to analyzed field development status. Then, gas lift technologies were studied. And diversified supporting technologies of both single-well skid mounted intermittent gas lift and multi-well continuous centralized boosting gas lift were developed from aspects of lift mode selection, conduit flow model optimization, string size, lift parameter, lift equipment, and surface process. Results show that (1) these gas lift technologies have no mechanical parts in the wellbore process, so they are quite available for gas wells with sand and water production;(2) the skid mounted gas lift is of strong flexibility for drainage of gas wells with water-flooded wellbores. And the centralized boosting gas lift is highly automatic and can provide large-scale simultaneous drainage for multiple wells, so it's suitable for those gas wells with water-flooded payzones;and (3) for these two gas lift technologies, certain technical complementation may realize the full coverage of "point and plane" and satisfy the demand of water drainage, so they will be important water-control means during middle to late de velopment stages.