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中间套管阶段直径13(3/8)英寸的中间套管，下在17(1/2)英寸的钻孔内。13(3/8)英寸的套管柱的设计方法与石油操作中的非常相似。确定了安全系数，除了温度的作用之外，所开列的设计依据都和油田应用中一样。从地表到1900英尺，13(3/8)英寸API K-55级、54.5磅/英尺的套管是令人满意的。此外，更重的套管也需要，通常是61磅/英尺，从1900英尺下到大约2800英尺处。据估计有H_2S存在时，要使用较软的等级。
The middle bushing stage is 13 (3/8) inches in diameter in the middle of the bushing, under the 17 (1/2) inch drill hole. The design of a 13 (3/8) inch casing string is very similar to that in oil operations. Determine the safety factor, in addition to the role of temperature, the design basis listed are the same as in oil field applications. Sleeves from the surface to 1900 feet, 13 (3/8) inches API K-55 and 54.5 pounds per foot are satisfactory. In addition, heavier sleeves are also needed, typically 61 pounds per foot, down from 1900 feet to about 2800 feet. H_2S is estimated to exist, to use a softer grade.