Means for generating electricity during drilling of a borehole

• US 4,491,738 A
• Filed: 11/22/1982
• Issued: 01/01/1985
• Est. Priority Date: 11/24/1981
• Status: Expired due to Fees

• Current Assignee: Shell Internationale Research Maatschappij BV (Shell Plc)
• Original Assignee: Shell Internationale Research Maatschappij BV (Shell Plc)
• Inventors: Kamp, Anthony-Willem
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Flower, Terry
• Application Number:
  US06/443,287
• Time in Patent Office: 771 Days
• Field of Search: 290/43, 290/42, 290/54, 290/53, 73/151, 175/40, 175/48, 175/104, 310/17, 310/27, 310/339, 367/83, 367/85
• US Class Current: 290/43
• CPC Class Codes: E21B 41/0085 Adaptations of electric power generating means for use in boreholes
• CPC Class Codes: E21B 47/20 by modulation of mud waves, e.g. by continuous modulation
• CPC Class Codes: E21B 47/22 by negative mud pulses using a pressure relieve valve between drill pipe and annulus
• CPC Class Codes: E21B 47/24 by positive mud pulses using a flow restricting valve within the drill pipe
• CPC Class Codes: H02K 35/00 Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit arrangements for handling mechanical energy structurally associated with generators H02K7/00, e.g. H02K7/06
• CPC Class Codes: H02K 7/1876 with reciprocating, linearly oscillating or vibrating parts
• CPC Class Codes: H02K 7/1892 Generators with parts oscillating or vibrating about an axis

Abstract

A generator for providing electric energy in a borehole during drilling thereof, the generator comprising an anchor which is movable in a reciprocating mode in response to pressure pulses in the drilling fluid caused by rapidly opening or closing a valve.

Claims

1. A machine, adapted to be carried in a section of drill string or similar downhole apparatus, for generating electric energy in response to fluid dynamics within the drill string, comprising:

a generator housing provided with connector means for mounting said housing within the drill string;

conduit means associated with said housing for providing fluid communication from the interior of the drill string through said housing;

valve means, associated with said conduit means, for controlling fluid flow through at least a part of said conduit means;

generator means, including a stator and an anchor, said stator being mounted within said housing, said anchor being contained within said housing so as to be movable in a reciprocating mode relative to said stator in response to changes in fluid flow through said conduit means caused by the operation of said valve means.

2. The machine of claim 1, wherein said conduit means includes a pipe section extending through said housing, said pipe section and said housing defining an annular space therebetween, said anchor being contained in the annular space;

and wherein said conduit means further comprises fluid inlet means for providing fluid communication between the interior of said pipe section and the annular space, and fluid outlet means for providing fluid communication between the annular space and the exterior of said housing, said valve means being adapted to control fluid flow through said outlet means.

3. The machine of claim 2, further comprising a flexible ring for dividing the annular space into an upper section and a lower section, said upper section and said lower section each being provided with fluid inlet means for providing fluid communication with the interior of said pipe section, said anchor having a first and second end and being mounted within said housing at said first end via said first flexible ring and connected to said housing at said second end via a resilient spring means.

4. The machine of claim 1, wherein said conduit means comprises a pipe section extending through said housing, said generator means is mounted within said pipe section, and said valve means is adapted to control the flow of fluid through said pipe section.

5. The machine of claim 4, wherein said anchor is supported within said pipe section by spring means for returning said anchor to an at rest position in the absence of fluid flow through said pipe section and wherein said anchor is adapted to be linearly displaced with respect to said stator in response to changes in fluid flow through said pipe section.

6. The machine of claim 4, wherein said anchor includes a plurality of blades for inducing rotational movement of said anchor relative to said stator in response to fluid flow through said pipe section, and further comprising torsion spring means for mounting said anchor within said pipe section, said spring means being adapted to return said anchor to its at rest position in the absence of fluid flow through said pipe section.