Inductive coupler for well tools
First Claim
Patent Images
1. An induction coupler for use with coaxial arranged tubular members comprising:
- A first tubular member constructed from like non-magnetic material and having a wall defining an cylindrically shaped inner core enclosure;
a core assembly disposed in said core enclosure and including a cylindrically shaped central magnetic ferrite rod, a central member with a thin wall central section forming a bore which is disposed about said ferrite rod and cylindrically shaped end pieces located at the ends of said ferrite rod, said central member having at least one lengthwise extending, thin separation defining lengthwise extending facing surfaces and an electrical insulation separating the adjoining facing surfaces, and a wire coil wrapped about said central section, said central member being constructed from a magnetic material;
said wall of said tubular member having a defined first wall thickness;
a second tubular member constructed from like non-magnetic materials and having inner and outer walls defining an annular shaped outer enclosure with the inner wall having a defined second wall thickness;
said first tubular member being sized relative to said second tubular member in a co-axial arrangement to define an annular spacing with a gap spacing between the outer surface of said wall of said first tubular member and the inner surface of said inner wall where said gap spacing, said first wall thickness and said second wall thickness effectively define the magnetic air gap; and
an annular coil assembly in said annular shaped outer enclosure including a wire coil wrapped around the inner wall and two annular end pieces located at the ends of the annular coil assembly, said end pieces having at least one lengthwise extending thin separation defining spacing surfaces, and an electrical insulation separating the adjoining facing surfaces, and a magnetic coupling means extending between said end pieces.
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Abstract
An inductive coupling device for coaxially arranged tubular members where the members can be telescopically arranged and the liner member has a magnetic core assembly constructed from magnetic iron with cylinder sloped ends and the outer member has an annular magnetic assembly aligned with the core assembly. The tubular members are non-magnetic enclosures and together with a gap spacing define an effective air gap.
138 Citations
27 Claims
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1. An induction coupler for use with coaxial arranged tubular members comprising:
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A first tubular member constructed from like non-magnetic material and having a wall defining an cylindrically shaped inner core enclosure; a core assembly disposed in said core enclosure and including a cylindrically shaped central magnetic ferrite rod, a central member with a thin wall central section forming a bore which is disposed about said ferrite rod and cylindrically shaped end pieces located at the ends of said ferrite rod, said central member having at least one lengthwise extending, thin separation defining lengthwise extending facing surfaces and an electrical insulation separating the adjoining facing surfaces, and a wire coil wrapped about said central section, said central member being constructed from a magnetic material; said wall of said tubular member having a defined first wall thickness; a second tubular member constructed from like non-magnetic materials and having inner and outer walls defining an annular shaped outer enclosure with the inner wall having a defined second wall thickness; said first tubular member being sized relative to said second tubular member in a co-axial arrangement to define an annular spacing with a gap spacing between the outer surface of said wall of said first tubular member and the inner surface of said inner wall where said gap spacing, said first wall thickness and said second wall thickness effectively define the magnetic air gap; and an annular coil assembly in said annular shaped outer enclosure including a wire coil wrapped around the inner wall and two annular end pieces located at the ends of the annular coil assembly, said end pieces having at least one lengthwise extending thin separation defining spacing surfaces, and an electrical insulation separating the adjoining facing surfaces, and a magnetic coupling means extending between said end pieces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for use in a well bore in a side pocket mandrel where said side pocket mandrel has a longitudinally extending side pocket bore offset from a longitudinally extending main bore of the mandrel for inductively coupling a well tool to an inductive probe, said apparatus comprising:
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an elongated probe housing disposed in said side pocket bore, said probe housing being a tubular member constructed from a non-magnetic material and having a housing wall defining a central bore for receiving a core assembly and a connecting end bore for receiving an electronics assembly, said core assembly including a cylindrically shaped central magnetic ferrite rod, a tubular shaped member formed by complementary semi-cylindrical shell members with a thin wall central section forming a bore which is disposed about said ferrite rod, and cylindrically shaped end pieces located at the ends of said ferrite rod, said shell member and having an electrical insulation adjoining facing surfaces, and a wire coil wrapped about said central section, and said shell members being constructed from a magnetic material, a well tool sized for passage through the main bore of the side pocket mandrel and sized for reception in the side pocket bore of the side pocket mandrel, said well tool having an annular end portion with tubular inner and outer members constructed from a non-magnetic material and where said inner member has a socket wall defining a bore sized to receive said probe housing and to define a gap spacing therebetween, said inner member having an outer annular recess, an annular coil wrapped around the inner member and two semi-annular end pieces made of magnetic material and located at the ends of the annular coil assembly, said end pieces having an electrical insulation separating adjoining facing surfaces, and a magnetic coupling means extending between said end pieces, said socket wall, said housing wall and said gap spacing being sized to minimize the gap spacing relative to the thickness of said walls and said socket wall and the housing wall having a thickness minimized to the minimum strength required for the mechanical performance of the tool and the probe housing. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. Apparatus for use in a well bore in a side pocket mandrel where said side pocket mandrel has a longitudinally extending side pocket bore offset from a longitudinally extending main bore of the mandrel for inductively coupling a well tool to an inductive probe, said apparatus comprising:
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an elongated probe housing disposed in said side pocket bore, said probe housing being a tubular member constructed from a non-magnetic material and having a housing wall defining a central bore for receiving a core assembly and a connecting end bore for receiving an electronics assembly, said core assembly including a cylindrically shaped central magnetic ferrite rod, a shell member with a thin wall central section forming a bore which is disposed about said ferrite rod, and cylindrically shaped end pieces located at the ends of said ferrite rod, said shell member having at least one lengthwise extending, thin separation defining facing surfaces, an electrical insulation separating the adjoining facing surfaces, and a wire coil wrapped about said central section, and said shell members being constructed from a magnetic material. a well tool sized for passage through the main bore of the side pocket mandrel and sized for reception in the side pocket bore of the side pocket mandrel, said well tool having an annular end portion with tubular inner and outer members constructed from a non-magnetic material and where said inner member has a socket wall defining a bore sized to receive said probe housing and to define a gap spacing therebetween, said inner member having an outer annular recess, an annular coil wrapped around the inner member and two end pieces made of magnetic material located at the ends of the annular coil assembly, said end pieces having at least one lengthwise extending thin separation defining facing surfaces, an electrical insulation separating the adjoining facing surfaces, and a magnetic coupling means extending between said end pieces, said socket wall, said housing wall and said gap spacing being sized to minimize the gap spacing relative to the thickness of said walls and said socket wall and the housing wall having a thickness minimized to the minimum strength required for the mechanical performance of the tool and the probe housing. - View Dependent Claims (24, 25, 26, 27)
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Specification