盐穴储气库氮气阻溶注氮量计算及现场试验

Nitrogen injection calculation and field test of the nitrogen dissolution inhibitor of salt-cavern gas storage

康延鹏 王文权 胡建林 巴金红 杜玉洁 李飞珂

KANG Yanpeng WANG Wenquan HU Jianlin BA Jinhong DU Yujie LI Feike

中国石油盐穴储气库技术研究中心 华北石油管理局有限公司江苏储气库分公司 中国石油华北油田分公司

PetroChina Research Center of Salt-Cavern UGS Technology, Zhenjiang 212000, Jiangsu, China Jiangsu Gas Storage Branch, PetroChina Huabei Petroleum Administration Co. Ltd., Zhenjiang 212000, Jiangsu, China PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China

盐穴储气库使用柴油作为阻溶剂，成本高，油水分离难度大，容易污染环境。氮气作为阻溶剂成本较低，环境友好无污染。为此开展了盐穴储气库氮气阻溶现场试验，结合气液界面控制方法，针对造腔过程中气液界面在裸眼和腔顶2种情况，建立氮气注入量计算式，在金坛储气库进行了2个阶段的氮气阻溶现场试验，结果表明，考虑10%~20%的损耗后，计算得到的注氮量和实际注氮量相符，试验井增加腔体体积约5×10⁴ m³，气液界面稳定，腔体形状规则，与设计基本一致。

As the blanket in a salt-cavern underground gas storage (UGS), diesel has the disadvantages of high cost, difficult oil and water separation and environmental pollution. When nitrogen is used as the blanket, however, it is of low cost and environmentally friendly without pollution. Nitrogen dissolution inhibitor of salt-cavern UGS was tested on site. Then, by virtue of the gas-brine contact control method, the formula for calculating nitrogen injection was established for the scenarios of gas-brine contact at open hole and cavity top in the process of solution mining. Finally, the nitrogen dissolution inhibitor of two stages was tested in the field of Jintan Underground Gas Storage. It is indicated that the calculated nitrogen injection is accordant with the actual value after the loss of 10%-20% is taken into account. Thanks to the test well, the cavity volume is increased by about 5×10 m, the gas-brine contact is stable and the cavity shape is regular, which is basically in line with the expectation.

10.13639/j.odpt.2020.04.018