Corrosion inhibition apparatus for downhole electrical heating
This patent describes an electromagnetic heating system for an oil well or other mineral fluid well, including a main heating electrode located downhole in the well at a level adjacent a mineral fluid deposit, and a return electrode located such that an electrical current between the electrodes passes through and heats a portion of the mineral fluid deposit, an electrical energizing apparatus including an A.C.power source for generating a high amplitude. A.C. heating current, of at least fifty amperes, a D.C. bias source for generating a low amplitude D.C. bias current having a given polarity such as to inhibit corrosion at the main electrode, and connection means for applying both the A.C. heating current and the D.C. bias current to the electrodes of the well heating system. It comprises a bias circuit, connected to a heating circuit that includes the A.C. power source, the bias circuit including at least one semiconductor device and developing a net D.C. voltage differential of the given polarity in response to the A.C. heating current.
- Assignee:
- Ventech Corp., Denver, CO (USA)
- Patent Number(s):
- US 4919201; A
- Application Number:
- PPN: US s 7-322919
- OSTI ID:
- 6572030
- Resource Relation:
- Patent File Date: 14 Mar 1989
- Country of Publication:
- United States
- Language:
- English
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