水平井中钻杆对双侧向测井的影响

用钻杆输送双侧向测井仪进行水平井测井，当钻杆不通电时，浅侧向的探测深度达不到钻杆位置，钻杆处于零电位区，对浅侧向响应不会产生影响；深侧向的仪器位于低阻层，钻杆所处位置的电位较高，对深侧向响应将产生影响。当钻杆作深侧向回路电极时，用计算出的带钻杆加长电极系系数刻度可将钻杆影响归结为仪器固有特性，测井响应则可不另外考虑钻杆影响。

Influence of Drill Rod on DLL in Horizontal Well Logging

A dual laterolog logging tool can be transported to horizontal well logging by means of a drill rod. If the rod is not been connected to the power, the probe depth for the shallow laterolog can not reach the depth at which the drill rod locates,in other words, the response of the tool is not influenced by the rod; if the tool is in low - resistance beds for the deep laterolog, the potentials of the area where the drill rod stays are much higher than in high - resistance beds. The rod will influence the response for the deep laterolog. When the rod is used as a circular conductor of the deep laterolog tool, the influence of the rod can be attributed to the inherent property of the tool when the apparent resistance is graduated by the new electrode coefficents. Therefor, the influence of the rod is need not taken into account.