厚夹层盐穴储气库扩大储气空间造腔技术

发布时间：2018-11-06 15:05

【摘要】：针对目前国内盐矿普遍发育厚夹层的问题,通过室内实验、数值模拟和现场试验,分析厚夹层是否可以垮塌,以实现上下盐层连通,扩大单腔储气空间。分析夹层的水溶机理、水浸后力学参数变化规律后发现:水浸后夹层呈蜂窝状溶解且产生裂缝,利于剥落,剥落残渣占据空间较小;水浸后夹层力学强度明显降低,易发生破坏,有利于夹层垮塌。利用夹层垮塌临界跨度计算模型可预测夹层垮塌时机,通过数值模拟获得了厚夹层垮塌规律,表明夹层厚度越小,夹层埋深、腾空跨度和盐腔高度越大,夹层垮塌的可能性越大。提出了"充分浸泡夹层、二次建槽"的设计思路,针对某储气库12 m厚夹层进行造腔试验设计,并在2口井进行了现场试验,表明厚夹层可以垮塌,且增加了造腔高度,提高了单腔工作气量,具有技术和经济可行性。
[Abstract]:Aiming at the problem that thick intercalation is widely developed in domestic salt mines at present, through laboratory experiment, numerical simulation and field test, this paper analyzes whether thick interlayer can collapse in order to realize the connection of upper and lower salt layers and to enlarge the gas storage space of single cavity. After analyzing the mechanism of water solution of intercalation, it is found that after water leaching, the interlayer dissolves in honeycomb shape and produces cracks, which is favorable to spalling, and the spalling residue occupies less space. After water immersion, the mechanical strength of interlayer is obviously reduced and easily destroyed, which is beneficial to the collapse of interlayer. The critical span model of intercalation collapse can be used to predict the time of intercalation collapse. The law of thick intercalation collapse is obtained by numerical simulation. It is shown that the smaller the intercalation thickness, the deeper the interlayer buried, the larger the emptying span and the height of salt cavity. The more likely the interlayer collapses. This paper puts forward the design idea of "fully immersing intercalation, secondary building trough", and designs the cavernous test for a 12 m thick interlayer in a gas storage tank. Field tests are carried out in two wells, which show that thick interlayer can collapse and increase the height of cavities. The working gas volume of single chamber is increased, and the technical and economic feasibility is obtained.
【作者单位】：中国石油勘探开发研究院廊坊分院;中国石油天然气集团公司油气地下储库重点实验室;中国石油东部管道有限公司;中国石油对外合作部;中国石油渤海钻探工程有限公司第二录井分公司;
【基金】：中国石油重大科技专项“地下储气库地质与气藏工程关键技术研究与应用”(2015E-4002)
【分类号】：TE972.2

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