Modified formation testing apparatus with borehole grippers and method of formation testing
AssigneeBaker Hughes Incorporated
InventorsPer-Erik Berger, Volker Krueger, Matthias Meister, John M. Michaels, Jaedong Lee
Life of this patent
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Abstract
An apparatus and method for obtaining samples of pristine formation or; formation fluid, using a work string designed for performing other downhole work such as drilling, workover operations, or re-entry operations. An extendable element extends against the formation wall to obtain the pristine formation or fluid sample. The apparatus includes at least one extendable gripper element for anchoring the apparatus during testing and sampling operations.
Claims19
An apparatus for testing an underground formation comprising:
- a) a work string disposed in a well borehole;
- b) at least one independently adjustable and extendable element mounted on the work string the extendable element being capable of sealing engagement with a wall of the borehole for isolating a portion of the well at the formation;
- c) at least one independently extendable gripper element_disposed on the work string axially spaced apart from a port, the port being selectively exposed to the isolated portion of the borehole wall, wherein the at least one extendable gripper element forcibly engages the borehole wall to anchor the work string radially, axially and circumferentially while the borehole wall is engaged by the at least one extendable gripper element;
- and
- (d) a test device for testing at least one characteristic of the formation.
A method for testing an underground formation comprising:
- a) disposing a work string in a well borehole;
- b) isolating a portion of the borehole wall by extending at least one independently extendable element from the work string to sealing engagement with the wall of the borehole at the formation;
- c) independently extending at least one gripper element into forceful engagement with the borehole wall axially spaced apart from a port, the port being exposed to the isolated portion of the borehole wall, wherein the at least one gripper element when extended anchors the work string radially, axially and circumferentially while the borehole wall is engaged by the at least one extendable element;
- and
- d) testing at least one characteristic of the formation at the isolated portion of the borehole well with a test device.
Dependencies are inferred from the claim text.