储气库井油套环空注保护液和氮气柱对比

发布时间：2018-02-24 11:07

本文关键词： 储气库油套环空氮气柱异常高压优化　出处：《石油学报》2017年10期 　论文类型：期刊论文

【摘要】：为了有效解决地下储气库注采过程中管柱内外压力变化给管柱安全性带来的问题,针对地下储气库气井管柱注采过程中温度、压力的波动特征,采用热力学与传热学理论,根据环空注满保护液与环空注入一段氮气柱2种情况分别建立了储气库管柱内外压力平衡模型,分析计算了2种模型的管柱内外压力及变化差异,重点研究了环空注氮气柱的最佳长度,绘制了氮气柱长度与封隔器下入深度最佳组合图版。研究结果表明:相同条件下环空注氮气可将注采过程中环空压力减少50%~90%,最佳氮气柱长度为封隔器下深的1/20~1/15;氮气柱长度越长,环空压力值越低;油管流体温度、油管内压力的敏感性分析表明,温度对环空压力变化影响较大;油套环空里注入合理的氮气柱长度可以防止储气库井管柱破坏和封隔器失效。
[Abstract]:In order to effectively solve the problem of string safety caused by the change of internal and external pressure in underground gas storage during injection and production, the thermodynamics and heat transfer theory are adopted in view of the fluctuating characteristics of temperature and pressure during injection and production of gas well string in underground gas storage. According to the conditions of full protection liquid injected in annulus and nitrogen column injected in annulus, the pressure balance model inside and outside the pipe string of gas storage tank is established, and the pressure inside and outside the pipe string and the variation difference between the two models are analyzed and calculated. The optimum length of annular nitrogen column was studied. The optimum combination of nitrogen column length and Packer entry depth is drawn. The results show that the annular nitrogen injection can reduce the annular air pressure by 50 / 90 and the optimum nitrogen column length is 1 / 20 / 1 / 15 of the depth under the Packer, and the longer the nitrogen column length is, the longer the nitrogen column length is. The sensitivity analysis of tubing fluid temperature and tubing pressure shows that temperature has great influence on annular pressure, and reasonable nitrogen column length can prevent well string failure and Packer failure.
【作者单位】：中国石油大学石油工程学院;油气网联(北京)科技有限公司;中国石油勘探开发研究院;中海油能源发展股份有限公司工程技术公司;北京雅丹石油技术开发有限公司;
【基金】：中国石油天然气股份有限公司重大科技专项“储气库注采工程关键技术研究”(2015E-4004)资助
【分类号】：TE822

【相似文献】