Self-Excited Codirectionally Magnetically Compensated Rotating Ranging Method

Figure 9

Influence of dynamic magnetization length of the casing on magnetization field. (a)–(f) show the variation of the magnetization field during the change of the dynamic magnetization length of the casing from 0 to 300 m at the 1000th, 2000th, 3000th, 5000th, 8000th, and 15000th measuring points, respectively.

(a)

(b)

(c)

(d)

(e)

(f)