METHOD AND APPARATUS FOR DETERMINING DOWNHOLE PRESSURES DURING A DRILLING OPERATION
First Claim
1. An apparatus for measuring downhole pressure, the apparatus disposed in a downhole drilling tool positionable in a wellbore having an annular pressure therein, the wellbore penetrating a subterranean formation having a pore pressure therein, the apparatus comprising:
- a conduit positioned in the downhole tool, the conduit having an opening adapted to receive downhole fluids, the conduit positionable in fluid communication with one of the wellbore and the formation whereby pressure is equalized therebetween; and
a gauge for measuring pressure in the conduit.
1 Assignment
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Accused Products
Abstract
A method and apparatus is provided to determine downhole pressures, such as annular pressure and/or pore pressure, during a drilling operation. A downhole drilling tool includes at least one conduit and a corresponding gauge. The conduit is positioned in the downhole tool and has an opening adapted to receive downhole fluids. The conduit is positionable in fluid communication with one of the wellbore and the formation whereby pressure is equalized therebetween. The gauge is provided for measuring the pressure in the conduit.
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Citations
62 Claims
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1. An apparatus for measuring downhole pressure, the apparatus disposed in a downhole drilling tool positionable in a wellbore having an annular pressure therein, the wellbore penetrating a subterranean formation having a pore pressure therein, the apparatus comprising:
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a conduit positioned in the downhole tool, the conduit having an opening adapted to receive downhole fluids, the conduit positionable in fluid communication with one of the wellbore and the formation whereby pressure is equalized therebetween; and
a gauge for measuring pressure in the conduit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A downhole drilling tool capable of measuring downhole pressures during a drilling operation, the downhole drilling tool positionable in a wellbore having an annular pressure therein, the wellbore penetrating a subterranean formation having a pore pressure therein, comprising:
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a bit;
a drill string;
at least one drill collar connected to the drill string, the drill collar having a cavity therein, the drill collar positionable within the wellbore such that the cavity is in fluid communication with one or the formation and the wellbore whereby pressure is equalized therebetween; and
a gauge for measuring pressure of the fluid in the cavity whereby the one of the annular and the pore pressure is determined. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 54)
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44. A method of measuring downhole pressures during a drilling operation in a wellbore having an annular pressure therein, the wellbore penetrating a formation having a pore pressure therein, the method comprising:
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positioning a downhole drilling tool in a wellbore, the downhole tool comprising a conduit and a gauge, the conduit having an opening adapted to receive downhole fluids, the gauge operatively connected to the conduit;
positioning the conduit in fluid communication with one of the formation and the wellbore such that pressure is equalized therebetween; and
measuring the pressure in the conduit. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53)
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55. An apparatus for measuring downhole pressure, the apparatus comprising:
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a first conduit in a protruding portion of the drilling tool, the protruding portion positionable adjacent a sidewall of the wellbore such that fluid communication is established between the first conduit and one of the formation and the wellbore and pressure equalization occurs therebetween;
a second conduit in a non-protruding portion of the drilling tool, the non-protruding portion positionable in non-engagement with the sidewall of the wellbore such that fluid communication is established between the first conduit and one of the formation and the wellbore and pressure equalization occurs therebetween;
and at least one gauge for measuring the pressure in the conduits. - View Dependent Claims (56, 57, 58, 59)
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60. An apparatus for determining downhole pressures, the apparatus positionable in a downhole tool disposable in a wellbore, the apparatus comprising:
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a drill collar having a cavity therein, the cavity adapted to receive downhole fluid, the downhole tool having an outer surface positionable in one of engagement and non-engagement with the wellbore wall, the conduit having an opening extending through the outer surface; and
a gauge operatively connected to the cavity for measuring pressure therein. - View Dependent Claims (61, 62)
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Specification