层状盐层中水平腔建库及运行的可行性

Feasibility of construction and operation of strata aligned cavern in bedded salt

淮安储气库、楚州储气库等西气东输外围储气库纯盐段厚度较小,若建库采用常规直井单腔造腔工艺,则必须钻深井连通不同深度的盐层。随钻井深度的增加,储气压力升高,地温升高,投资增加,蠕变效应也将增加。而采用水平造腔技术,可以在浅层选择相对较厚的纯盐段建造水平腔,从而最大化地利用盐岩体积。通过对水平造腔工艺、水平盐腔稳定性以及经济性进行分析,论证了水平造腔技术在中国的可行性。结果表明:水平造腔成本较小,且腔体稳定性能够满足注采运行条件,但是腔体形状的控制与检测尚存在一定困难,可以通过开展水平造腔试验和调整声呐参数确定腔体形状控制方法,并精确检测腔体形状。

The pure salt sections in the salt-cavern gas storages in the periphery of West-to-East Gas Pipeline（such as Huai＇an and Chuzhou gas storages） are thinner, so deep wells shall be drilled to connect the salt layers at different depth if the conventional vertical single cavern leaching technology is used. With the increasing of drilling depth, the reservoir pressure, reservoir temperature and investment as well as the creep effects increase. If the strata aligned cavern leaching technology is adopted, strata aligned caverns can be built in the thicker pure salt sections in the shallow layers, and the utilization of salt rock volume can be maximized. The feasibility of strata aligned cavern leaching technology in China was demonstrated by analyzing the strata aligned cavern leaching technology and the stability and economy of strata aligned cavern. It is indicated that this strata aligned cavern leaching technology costs less and its cavern stability can satisfy the injection and withdraw conditions, but the control and detection of cavity shape are in a way difficult. Cavity shape controlling method can be determined by using the test of strata aligned cavern leaching and adjusting sonar parameters to detect cavity shape precisely.