Patent ID: 9581012
Date: 2017-02-28
CPC Classifications: E21B

Claim:
1. A well system comprising a well pipe and a well tool arranged within the well pipe, wherein the well tool comprises: a housing; and a pulse generator provided within the housing, the pulse generator comprising a cylindrical inductor and a power supply device for supplying electrical power to the inductor to thereby generate an electromagnetic pulse which creates physical vibrations in the well pipe, the inductor comprising a coil arranged axially within the well pipe; wherein a ratio between a cross sectional gap area, Agap, and an inner cross sectional area of the inductor, Ainner, is in the range 0.9 to 1.1; and wherein the cross sectional gap area, Agap, is defined by  and the cross sectional area, Ainner, is defined by  wherein D denotes an inner diameter of the well pipe and d denotes a median diameter of the inductor, the median diameter of the inductor being an average value of an inner diameter and an outer diameter of the inductor.