公开(公告)号：US5099918A

公开(公告)日：1992-03-31

申请号：US646514

申请日：1991-01-25

申请人： Jack E. Bridges ,  George T. Dubiel

发明人： Jack E. Bridges ,  George T. Dubiel

IPC分类号： E21B36/00 ,  E21B36/04 ,  E21B41/02 ,  E21B43/24 ,  E21B47/06

CPC分类号： E21B41/02 ,  E21B36/006 ,  E21B36/04 ,  E21B43/2401 ,  E21B47/06

摘要： Electrical power sources and systems for heating in or adjacent to an oil well or other mineral well, or for heating other earth media, each comprising an A.C. heating generator that generates an A.C. heating current at a selected heating frequency substantially different from the conventional 50/60 Hz frequency used by power companies; the heating generator may comprise an A.C. to D.C. converter for developing an intermediate D.C. output of predetermined amplitude from a conventional 50/60 Hz A.C. input, and a solid state switching circuit for repetitively sampling the D.C. output of the converter at the selected heating frequency, usually in a range of 0.01 Hz (or even lower) up to about 35 Hz. A heating rate control varies the energy content and the frequency of the A.C. output to suit well requirements. Each power source or system includes output connections for connecting the output of the heating generator to a normally inaccessible main heating electrode, usually located downhole in a well, and to a return electrode; most have the capability of including a very small controllable D.C. component in the output.

摘要翻译： 用于在油井或其他矿井中或邻近油井或其他矿井加热或用于加热其它地球介质的电源和系统，每个包括交流加热发电机，其以与传统的50 / 电力公司使用的60 Hz频率; 加热发电机可以包括AC-DC转换器，用于从常规的50/60Hz AC输入开发预定幅度的中间DC输出，以及固态切换电路，用于以选定的加热频率重复地对转换器的DC输出进行采样， 通常在0.01Hz（甚至更低）至35Hz的范围内。 加热速率控制可以改变交流输出的能量含量和频率，以适应良好的要求。 每个电源或系统包括用于将发电机的输出连接到通常位于井下的通常不可接近的主加热电极和返回电极的输出连接; 大多数都具有在输出中包含非常小的可控直流分量的能力。

公开(公告)号：US4919201A

公开(公告)日：1990-04-24

申请号：US322912

申请日：1989-03-14

申请人： Jack E. Bridges ,  George T. Dubiel ,  Thomas J. Bajzek

发明人： Jack E. Bridges ,  George T. Dubiel ,  Thomas J. Bajzek

IPC分类号： C23F13/04 ,  E21B36/04 ,  E21B41/02

CPC分类号： C23F13/04 ,  E21B36/04 ,  E21B41/02 ,  Y10S166/902

摘要： Corrosion inhibition apparatus in an electromagnetic heating system for in situ downhole heating in an oil well or other mineral fluid well that includes an A.C. power source for a high amperage, low frequency heating current (e.g. over 50 amperes at 0.01 to 35 Hz) and a D.C. bias source for generating a low amplitude (e.g., less than one ampere) current for corrosion inhibition, both sources connected to a downhole electrode. The bias source includes at least one semiconductor device, connected in the main A.C. heating circuit, in a bias circuit that develops a net D.C. voltage differential of the polarity required for corrosion inhibition in response to the A.C. heating current.