摘要:
An integrated drilling and evaluation system includes a drill string having an interior portion and a drill bit, carried on a lower end, that includes ports for communicating fluid between the interior portion of the drill string and an uncased well bore. A packer, carried above the drill bit, is operable for sealingly closing a well annulus. A tester valve inserted in the drill string is operable for sealingly closing the drill string. The packer and tester valve are cooperatively operable for isolating a subsurface zone of interest. The system includes monitoring means inserted in the drill string for monitoring a parameter of well fluid from the subsurface zone. Once the subsurface zone is isolated, well fluid is communicated into the interior portion of the drill string through the ports of the drill bit, received by the monitoring means, and tested without removing the drill string form the well.
摘要:
A downhole tool for use in a well bore is provided. The tool includes a tool body and at least one elongated sprung member deployed on an outer surface thereof. The sprung member is configured to lie in a rest position substantially parallel to the outer surface and further includes at least one movable end that is movable with respect to the tool body. The tool further includes an actuation module deployed on the tool body. The actuation module is operably engaged with the sprung member, and disposed, upon actuation, to deflect said movable end thereof away from the rest position. Displacement of the movable end of the sprung member causes elastic spring biasing of the sprung member via bending thereof. The biasing urges the sprung member to return to the rest position upon de-actuation of the actuation module.
摘要:
A downhole steering tool is disclosed. The steering tool includes a rotatable shaft, a substantially non-rotating tool body deployed about the shaft, and a plurality of force application members deployed on the steering tool body. The steering tool further includes a bendable section deployed in the steering tool body. The bendable section is disposed to bend preferentially relative to the steering tool body under an applied bending load. The use of a steering tool body having a bendable section tends to advantageously reduce bending stresses in the steering tool body during use. Moreover, tools embodying this invention may be suitable for higher dogleg severity applications.
摘要:
A method and apparatus is provided for measurement-while-drilling utilizing improved antennas. An elongated tubular member is provided with an outer peripheral surface having a contoured portion defining a plurality of discrete communication regions of reduced radial dimension. An antenna pathway is defined in the elongated member substantially transverse to the plurality of discrete communication regions. An antenna member is partially disposed in the antenna pathway with portions of the antenna member extending out of the elongated member at the plurality of discrete communication regions to facilitate communication of electromagnetic energy. In a reception mode of operation, the antenna member detects electromagnetic energy in the wellbore and generates a current corresponding thereto. If operated in a transmission mode of operation, the antenna member emits electromagnetic energy in the wellbore in response to an energizing current. Preferably, the plurality of discrete communication regions are circumferentially disposed about the elongated member. Means is provided for preferentially communicating electromagnetic energy with particular portions of the antenna member which are disposed in the plurality of discrete communication regions. In one particular embodiment, a plurality of electrically-operable magnetic circuit elements are provided for communicating with particular ones of the plurality of discrete communication regions of the antenna member, for altering antenna gain in response to at least one control signal.
摘要:
A steering tool for use in a well bore is disclosed. The tool includes at least one extendable and retractable blade deployed thereon. The blade is elastically spring biased radially inwards towards the tool such that upon removal of an actuating force, the blade retracts. In exemplary embodiments, the blade includes at least one spring-like, elastically deformable member disposed to elastically spring bias the blade. The spring-like member may include first and second elongated leg portions located on opposing sides of a sprung hairpin portion. Tools embodying this invention may be advantageous for small diameter applications.
摘要:
An integrated drilling and evaluation system includes a drill string having an interior portion and a drill bit, carried on a lower end, that includes ports for communicating fluid between the interior portion of the drill string and an uncased well bore. A packer, carried above the drill bit, is operable for sealingly closing a well annulus, A tester valve inserted in the drill string is operable for sealingly closing the drill string. The packer and tester valve are cooperatively operable for isolating a subsurface zone of interest. The system includes monitoring means inserted in the drill string for monitoring a parameter of well fluid from the subsurface zone. Once the subsurface zone is isolated, well fluid is communicated into the interior portion of the drill string through the ports of the drill bit, received by the monitoring means, and tested without removing the drill string form the well.
摘要:
A formation fluid sampling tool including at least one sample tank mounted in a tool collar. The tool collar includes a through bore and is disposed to be operatively coupled with a drill string such that each sample tank may receive a correspondingly preselected formation fluid sample without removing the drill string from a well bore. At least one of the sample tanks further includes an internal fluid separator movably disposed therein. The separator separates a sample chamber from a pressure balancing chamber in the sample tank. The pressure balancing chamber is disposed to be in fluid communication with drilling fluid exterior thereto. The sampling tool further includes a sample inlet port connected to the sample chamber by an inlet passageway.