Slotted tubulars for subsurface monitoring in directed orientations
First Claim
1. A tubular for monitoring subsurface reservoir characteristics in a directed orientation, comprising:
- an elongated metallic body with a longitudinal axis for permanent disposal within a borehole traversing the reservoir;
a plurality of openings formed along the tubular wall to allow for passage of electromagnetic energy therethrough, the openings formed at an angle with respect to the longitudinal axis of the tubular and sealed to prevent fluid passage;
a groove formed about the external circumference of the tubular in alignment with the openings;
an antenna disposed on the exterior of the tubular within the groove such that its axis is tilted with respect to the axis of the tubular, the antenna adapted to transmit or receive electromagnetic energy;
wherein the antenna is disposed on the tubular such that the antenna is perpendicular to the tubular openings at intersections of the antenna and openings; and
the tubular adapted for connection to another tubular to form a conduit for passage of subsurface fluids or gases through the reservoir.
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Accused Products
Abstract
Tubulars for monitoring subsurface reservoir characteristics in directed orientations. Elongated tubulars for permanent subsurface disposal are equipped with antennas adapted to transmit or receive electromagnetic energy. A tilted antenna is disposed within a groove on the tubular exterior. The groove includes a sealed opening to allow for passage of electromagnetic energy therethrough and the antenna is disposed within the groove in alignment with the opening such that the antenna is substantially perpendicular to the opening at the intersection. Methods for subsurface reservoir monitoring using the tubulars are also presented.
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Citations
29 Claims
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1. A tubular for monitoring subsurface reservoir characteristics in a directed orientation, comprising:
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an elongated metallic body with a longitudinal axis for permanent disposal within a borehole traversing the reservoir;
a plurality of openings formed along the tubular wall to allow for passage of electromagnetic energy therethrough, the openings formed at an angle with respect to the longitudinal axis of the tubular and sealed to prevent fluid passage;
a groove formed about the external circumference of the tubular in alignment with the openings;
an antenna disposed on the exterior of the tubular within the groove such that its axis is tilted with respect to the axis of the tubular, the antenna adapted to transmit or receive electromagnetic energy;
wherein the antenna is disposed on the tubular such that the antenna is perpendicular to the tubular openings at intersections of the antenna and openings; and
the tubular adapted for connection to another tubular to form a conduit for passage of subsurface fluids or gases through the reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for monitoring subsurface reservoir characteristics in a directed orientation, comprising:
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(a) permanently disposing a tubular within a borehole traversing the reservoir, the tubular having an elongated metallic body with a longitudinal axis and a plurality of openings formed along its wall to allow for passage of electromagnetic energy therethrough, the openings formed at an angle with respect to the tubular axis and sealed to prevent fluid passage, a groove formed about the external circumference of the tubular in alignment with the openings and having an antenna disposed therein such that its axis is tilted with respect to the tubular axis, the antenna adapted to transmit or receive electromagnetic energy and disposed on the tubular such that the antenna is perpendicular to the openings at intersections of the antenna and openings;
(b) using the tubular to form a conduit for passage of subsurface fluids or gases through the reservoir; and
(c) activating the antenna to transmit or receive electromagnetic energy to determine a resistivity profile of the reservoir. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification