Well tool for use in a well pipe

摘要

A well tool (10) for use in a well pipe comprises a housing (11) and a pulse generator (14) provided within the housing (11). The pulse generator (14) comprises an inductor (Ls), and a power supply device (HV, c) for supplying electrical power to the inductor (L) and thereby providing that an electromagnetic pulse is generated, in such a way that the electromagnetic pulse is providing physical vibrations in the well pipe. A cross sectional gap area (Agap) of an annular gap between a median of the inductor (Ls) and an inner surface of the well pipe is substantially equal to an inner cross sectional area (Ainner) of the inductor (Ls) up to the median diameter (d) of the inductor.

主权项

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 byAgap=π⁡(D2)2-π⁡(d2)2,  and the cross sectional area, Ainner, is defined byAinner=π⁡(d2)2,  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.