对于双分支井和四分支的鱼骨状井而言，也存在同样的规律。
As for dual branch Wells and fish-bone Wells with 4 branches, the same rule also exists.
TK 908dh井是目前国内完成最深的双分支井，施工难度达到国际分级标准TAML 4级。
TK908DH well was an deepest well with dual lateral, and the difficulty of drilling run up to international grade scale TAML4 level.
TK 90 8dh井是塔河油田第一口双分支水平井，同时也是国内垂深最深的一口双分支水平井。
TK908DH is the first dual branch horizontal well in Tahe Oilfield. It is the deepest in vertical depth in China.
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