Source: http://www.patentgenius.com/patent/7798249.html
Timestamp: 2018-10-20 01:40:41
Document Index: 132538551

Matched Legal Cases: ['Application No. 04759869', 'Application No. 04759869', 'Application No. 04759869', 'Application No. 04759869', 'Application No. 04759869', 'Application No. 04759869', 'Application No. 04759869', 'Application No. 04759869', 'Application No. 04759869']

Impact excavation system and method with suspension flow control - Patent # 7798249 - PatentGenius
7798249 Impact excavation system and method with suspension flow control
Inventor: Tibbitts
Application: 11/344,805
Inventors: Tibbitts; Gordon Allen (Murray, UT)
Attorney Or Agent: Arnold & Knobloch, L.L.P.
U.S. Class: 175/67; 175/424; 175/54
Field Of Search: 175/67; 175/54; 175/424
International Class: E21B 7/18
Foreign Patent Documents: 2522568; 2588170; 0192016; 2385346; 2385346; 20055376; 200225053; WO 02/25053; 0234653; 0292956; WO 2004/094734; WO 2004/106693; 200601997; 2009009792; 2009049076; 2009065107; 2009099945
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Abstract: A system and method for excavating a wellbore through a subterranean formation that includes a drill string having an inner passage for flowing a suspension of fluid and impactors. The drill string includes a flow control device to block flow in the drill string passage or in the annulus formed between the drill string and the wellbore inner wall from lowing into the bit when flow is reduced or stopped. The flow can take place due to fluid density differences resulting from impactors being in suspension in the fluid. The flow control device includes a selectively openable and closable valve. Valve embodiments include valves having flapper elements, a plurality of cables suspended in an annular configuration, and whisker elements.
1. A method comprising: receiving a suspension of impactors and fluid in a drill string defining a passage so that at least a portion of the suspension flows through thepassage and to a body member, the drill string partially defining an annulus; discharging the at least a portion of the suspension in a formation using the body member so that at least a portion of the imp actors is received in the annulus; andgenerally preventing at least a portion of the at least a portion of the impactors present in the annulus from flowing from the annulus and into the passage, comprising: coupling a control device to the drill string, the control device comprising atleast one valve member; and placing the at least one valve member in a closed position; wherein the control device comprises at least one other valve member; and wherein the method further comprises generally preventing at least another portion of theimpactors present in the passage from flowing to the body member, comprising: placing the at least one other valve member in a closed position.
2. A system comprising: means for receiving a suspension of impactors and fluid in a drill string defining a passage so that at least a portion of the suspension flows through the passage and to a body member, the drill string partiallydefining an annulus; means for discharging the at least a portion of the suspension in a formation using the body member so that at least a portion of the impactors is received in the annulus; and means for generally preventing at least a portion ofthe at least a portion of the impactors present in the annulus from flowing from the annulus and into the passage, comprising: means for coupling a control device to the drill string, the control device comprising at least one valve member; and meansfor placing the at least one valve member in a closed position; wherein the control device comprises at least one other valve member; and wherein the system further comprises means for generally preventing at least another portion of the impactorspresent in the passage from flowing to the body member, comprising: means for placing the at least one other valve member in a closed position.
3. A system comprising: means for receiving a suspension of impactors and fluid in a drill string defining a passage so that at least a portion of the suspension flows through the passage and to a body member, the drill string partiallydefining an annulus; means for discharging the at least a portion of the suspension in a formation using the body member so that at least a portion of the impactors is received in the annulus; and means for generally preventing at least a portion ofthe at least a portion of the impactors present in the annulus from flowing from the annulus and into the passage; means for generally preventing at least another portion of the impactors present in the passage from flowing to the body member; meansfor permitting at least a portion of the fluid present in the passage to flow to the body member during generally preventing the at least another portion of the impactors present in the passage from flowing to the body member; and means for permittingthe at least another portion of the impactors present in the passage to flow to the body member after generally preventing the at least another portion of the impactors present in the passage from flowing to the body member; wherein means for generallypreventing the at least another portion of the impactors present in the passage from flowing to the body member comprises: means for coupling a control device to the drill string; and means for placing the control device in a closed configuration; wherein the system further comprises: means for permitting the at least a portion of the at least a portion of the impactors present in the annulus to flow from the annulus and into the passage after generally preventing the at least a portion of the atleast a portion of the impactors present in the annulus from flowing from the annulus and into the passage; and means for permitting at least a portion of the fluid present in the annulus to flow during generally preventing the at least a portion of theat least a portion of the impactors present in the annulus from flowing from the annulus and into the passage; and wherein means for generally preventing the at least a portion of the at least a portion of the impactors present in the annulus fromflowing from the annulus and into the passage comprises means for coupling a control device to the drill string.
4. An apparatus comprising: a drill string defining a passage within which a suspension of impactors and fluid is adapted to flow; a body member for discharging at least a portion of the suspension in a formation; and a control device coupledto the drill string for controlling the flow of at least a portion of the impactors through the body member, comprising: a closed configuration in which the at least a portion of the impactors is generally prevented from flowing through the passage andto the body member for discharge therethrough; and an open configuration in which the at least a portion of the impactors is permitted to flow through the passage and to the body member for discharge therethrough; and another control device coupled tothe drill string and comprising: a closed configuration in which at least another portion of the impactors is generally prevented from flowing through the body member and into the passage; and an open configuration in which the at least another portionof the impactors is permitted to flow through the body member and into the passage.
5. A system for excavating a wellbore through a subterranean formation, the system comprising: a drill string disposed in the wellbore forming an annulus in the space between the drill string and the wellbore inner wall, the drill string havingan axial passage along its length, a suspension of impactors and fluid flowable in the passage; a body member on an end of the drill string disposed in the wellbore; a nozzle on the body member having an inlet in fluid communication with the axialpassage and an outlet directed at the formation, so that when the flowing suspension reaches the nozzle inlet, a suspension discharge exits the nozzle outlet to remove a portion of the formation; and a flow controller having a valve coupled with thedrill string, the valve selectively moveable between an open position and a closed position, so that when the valve is in the closed position flow through the valve is blocked; the valve comprising: a multiplicity of elastic whiskers projecting from adrill string surface, and the fluid is pressurized by a pump, so that when a flowing suspension of impactors and pressurized fluid flows past the drill string surface the whiskers are bent in the direction of the flow, and so that when the pump ceasespressurizing the fluid the whiskers become aligned generally perpendicular to the drill string axis and wherein the impactors are impeded from flowing past the valve by the density of whiskers; wherein the valve is disposed within the annulus when thepump ceases pressurizing fluid, impactor flow through the annulus is impeded.
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