长庆储气库合理注气压力的确定

Reasonable determination of gas injection pressure in Changqing gas storage

利用衰竭气藏建设地下储气库具有储存量大、经济合理、安全系数大等优点。长庆油田计划在榆林气田南区X气藏和靖边气田陕Y气藏建设地下储气库先导试验区。由于储气库必须具备战略应急和高峰供气的能力,其气井和地面配套工艺需实现"快进快出、生产调峰能力大",因此地面配套工艺设计大型注气压缩机和高压力等级管网,注采井采用水平井建设。目前在长庆建设储气库尚属首次,如何对储气库合理配注没有成熟经验可参考,合理注气压力的确定是保障储气库正常生产、安全平稳运行的前提条件。本文通过已知地层的破裂压力,利用气藏工程方法对注气系统压力节点分析,结合注气压缩机能力,反推注气井口压力,综合考虑地面配套设备及管网设计能力及储气库设计压力运行范围,提出长庆储气库合理的注气压力,指导储气库先导试验区的注采试验。

Failure to take advantage of the construction of underground gas storage gas reservoirs with storage capacity, economical, safety factor and so on. Changqing oilfield plans construction of underground gas storage pilot test area in the X of south Yulin gas field and the Y of Jingbian gas field. Since gas storage capacity must have a strategic emergency and peak gas, the gas and ground supporting processes required to achieve ＂fast forward and fast out, large-scale production peaking capacity＂, so the ground supporting the process design of large high-pressure gas injection compressors and pipe grade, injection wells using horizontal wells Hirai construction. Currently construction is still in the Changqing gas storage for the first time, how to inject gas storage reasonable with no reference to the mature experience, reasonable determination of gas injection pressure gas storage is to protect the normal production, a prerequisite for safe operation. Through the formation fracture pressure isknown, the use of gas reservoir engineering methods for gas injection system pressure nodal analysis, combined with gas injection compressor capacity, injection wellhead pressure, considering the design of ground support equipment and pipeline capacity and gas storage design pressure operating range, made reasonable injection pressure of Changqing gas storage,injection test to guide gas storage pilot test area.