Patents by Inventor Lang Zhan
Lang Zhan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20150252669Abstract: An apparatus may include a tubular, a first isolator connected to the tubular and configured to engage an interior surface of the wellbore, a first pressure gauge connected to the tubular and configured to take multiple pressure readings over a period of time, and a first perforation gun connected to the tubular without compromising the communication of fluid through an inner flow channel of the tubular. A method may include placing the apparatus in a wellbore, and actuating the isolator to provide isolation of a first zone in a formation. The method may include activating the perforation gun to provide fluid communication between an annulus of the wellbore and the zone in the formation. The method may include allowing the pressure gauge to take a plurality of pressure readings over a period of time. Based on the pressure readings, the method may include determining a formation characteristic.Type: ApplicationFiled: March 4, 2015Publication date: September 10, 2015Inventors: Phillip Scott FAIR, Robert James DOMBROWSKI, Ernesto Rafael FONSECA OCAMPOS, Alan Clifford REYNOLDS, Darren HUYNH, Lang ZHAN, David Lindsay Alexander LANGILLE, Wayne L. DUMONT
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Publication number: 20140209381Abstract: A charge assembly for incorporation into a downhole tool to induce pressure at an interior of the tool during a downhole application. The assembly includes a reactive powder metals that is particularly configured of a reaction rate slower than that of a high energy explosive directed at the application. Thus, upon triggering of the explosive and downhole application in a high pressure well environment, reaction of the powder metals may serve to substantially reduce any pressure differential at the tool. As such, shock related damage due to sudden introduction of pressure differential wave to the tool may be minimized.Type: ApplicationFiled: January 28, 2013Publication date: July 31, 2014Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Hongfa Huang, Brenden M. Grove, Lang Zhan
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Patent number: 8731889Abstract: A method for calibrating fracture networks. The method includes estimating an average fracture width of a fracture network using one or more of net fracturing pressure, Poisson's ratio, shear modulus, and fracture height; determining microseismic event envelope and base intensity data using a three-dimensional geomodel including microseismic event data; and determining hydraulic fracturing treatment (HFT) fracture intensity of post-hydraulic fracturing treatment (post-HFT) based on the average fracture width and HFT volume data. The method further includes calibrating the base intensity data to the HFT fracture intensity to obtain calibrated HFT fracture intensity, determining a proppant transportation and distribution scenario, and generating a dual porosity reservoir model based on the calibrated HFT fracture intensity and the proppant transportation and distribution scenario.Type: GrantFiled: October 21, 2010Date of Patent: May 20, 2014Assignee: Schlumberger Technology CorporationInventors: Changan Mike Du, Xu Zhang, Debbie Fullilove, Bradley John Hay, Keith Tushingham, Lang Zhan, Hongren Gu, Joel Herve Le Calvez, Walter Dee Grant
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Patent number: 8620636Abstract: Based on measurements that are obtained from a well test, a pressure in the well is modeled as a function of at least a skin effect factor that varies with time. The results of the modeling may be used to estimate at least one well parameter, such as a formation parameter and/or a well pressure, as examples.Type: GrantFiled: February 13, 2007Date of Patent: December 31, 2013Assignee: Schlumberger Technology CorporationInventors: Lang Zhan, Fikri J. Kuchuk, James G. Filas, Dhandayuthapani Kannan
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Patent number: 8424606Abstract: A perforating system having a perforating gun with a tubular gun housing defining an inner volume and extending in an axial direction. A shaped charge is held in a loading tube. The loading tube is located in the gun housing. The loading tube extends along the axial direction. The shaped charge faces in a firing direction substantially perpendicular to the axial direction. A portion of the gun housing adjacent to the shaped charge in the firing direction is a perforating portion for removal upon firing of the shaped charge. An eccentralizer member extends from the perforating gun in a second direction that is substantially opposite and parallel with the firing direction. A first retainer part extends from an outer surface of the gun housing adjacent to the perforating portion. A second retainer part extends from the outside of the gun housing adjacent to the perforating portion.Type: GrantFiled: June 26, 2009Date of Patent: April 23, 2013Assignee: Schlumberger Technology CorporationInventors: Lang Zhan, Jean-Luc Lafontan, Harvey Williams, Jeremy P. Harvey, Brenden Grove, Lawrence A. Behrmann
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Publication number: 20110257944Abstract: A method for calibrating fracture networks. The method includes estimating an average fracture width of a fracture network using one or more of net fracturing pressure, Poisson's ratio, shear modulus, and fracture height; determining microseismic event envelope and base intensity data using a three-dimensional geomodel including microseismic event data; and determining hydraulic fracturing treatment (HFT) fracture intensity of post-hydraulic fracturing treatment (post-HFT) based on the average fracture width and HFT volume data. The method further includes calibrating the base intensity data to the HFT fracture intensity to obtain calibrated HFT fracture intensity, determining a proppant transportation and distribution scenario, and generating a dual porosity reservoir model based on the calibrated HFT fracture intensity and the proppant transportation and distribution scenario.Type: ApplicationFiled: October 21, 2010Publication date: October 20, 2011Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Changan Mike Du, Xu Zhang, Debbie Fullilove, Bradley John Hay, Keith Tushingham, Lang Zhan, Hongren Gu, Joel Herve Le Calvez, Walter Dee Grant
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Patent number: 8020437Abstract: The invention relates to fluid sampling in a test that is used to determine physical and chemical characteristics of the fluids in a subterranean reservoir. The method reconstructs the entire pressure history of the fluid parcel that is captured in the fluid samplers during a test. Using this reconstructed pressure history of the samples, the quality of the samples, particularly, whether there is a phase change in the samples during the test, can be accurately quantified.Type: GrantFiled: June 26, 2007Date of Patent: September 20, 2011Assignee: Schlumberger Technology CorporationInventors: Lang Zhan, Dhandayuthapani Kannan, James G. Filas, Graham Birkett
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Publication number: 20110130966Abstract: The present document discloses techniques to perform an impulse well test for formation property estimation of subsurface reservoirs. It disclosures a method to obtain the optimum time range of a downhole isolation valve closure to achieve an acceptable depth of investigation for an impulse test and methodologies to optimize the execution of an impulse test using the simulated and measured real time bottomhole pressure data. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.Type: ApplicationFiled: December 1, 2010Publication date: June 2, 2011Applicant: Schlumberger Technology CorporationInventors: Lang Zhan, Anna Guichard
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Patent number: 7886591Abstract: Methods and apparatus for improving the determination of at least one multiphase flow parameter of an earth formation comprising propagating within the formation a first salinity front, determining a first value of the at least one multiphase flow parameter, propagating in the formation a second salinity front and improving the determination of the at least one multiphase flow parameter from the first value for the at least one multiphase flow parameter and a saturation profile associated with the first and second salinity fronts within the formation.Type: GrantFiled: March 3, 2008Date of Patent: February 15, 2011Assignee: Schlumberger Technology CorporationInventors: Terizhandur S. Ramakrishnan, Fikri John Kuchuk, Yusuf Bilgin Altundas, Lang Zhan
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Patent number: 7849920Abstract: For optimizing well production, intervals are selected along a deviated wellbore, and a well test and treatment string is deployed in the wellbore. Each interval is then isolated to enable performance of desired testing. The test data obtained is evaluated to determine an appropriate remedial action which is then implemented via the well test and treatment string. The system and method enable the testing and treatment of a plurality of intervals along a horizontal well during the same run downhole.Type: GrantFiled: December 20, 2007Date of Patent: December 14, 2010Assignee: Schlumberger Technology CorporationInventors: Dhandayuthapani Kannan, David E. Sask, Lang Zhan, James G. Filas
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Patent number: 7775273Abstract: An apparatus for use in a wellbore includes a tool string and a plurality of sensors, which include at least a first sensor to detect pressure signals in an inner conduit of the tool string and at least a second sensor to detect pressure signals in an annulus outside the tool string. A controller actuates a tool in the tool string in response to a logical combination of outputs from the sensors, where the outputs of the sensors are responsive to the respective pressure signals.Type: GrantFiled: July 25, 2008Date of Patent: August 17, 2010Assignee: Schlumberber Technology CorporationInventors: David Merlau, Lang Zhan, Dhandayuthapani Kannan, Jim B. Benton
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Publication number: 20100169019Abstract: Methods for estimating an unknown value for a dynamic under-balance condition are herein disclosed. The unknown value may be a well property value, or may be a transient pressure characteristic. Embodiments of the method include selecting at least one transient pressure characteristic and selecting at least one well property value. A correlation between the at least one transient pressure characteristic and at least one well property value is obtained. The unknown value is estimated by applying at least one known transient pressure characteristic or at least one known well property value to the obtained correlation.Type: ApplicationFiled: April 6, 2009Publication date: July 1, 2010Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Lang Zhan, Jeremy P. Harvey, Brenden M. Grove, Harvey A. R. Williams, Lawrence A. Behrmann
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Publication number: 20100163238Abstract: A perforating system having a perforating gun with a tubular gun housing defining an inner volume and extending in an axial direction. A shaped charge is held in a loading tube. The loading tube is located in the gun housing. The loading tube extends along the axial direction. The shaped charge faces in a firing direction substantially perpendicular to the axial direction. A portion of the gun housing adjacent to the shaped charge in the firing direction is a perforating portion for removal upon firing of the shaped charge. An eccentralizer member extends from the perforating gun in a second direction that is substantially opposite and parallel with the firing direction. A first retainer part extends from an outer surface of the gun housing adjacent to the perforating portion. A second retainer part extends from the outside of the gun housing adjacent to the perforating portion.Type: ApplicationFiled: June 26, 2009Publication date: July 1, 2010Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Lang Zhan, Jean-Luc Lafontan, Harvey Williams, Jeremy P. Harvey, Brenden Grove, Lawrence A. Behrmann
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Publication number: 20100018714Abstract: An apparatus for use in a wellbore includes a tool string and a plurality of sensors, which include at least a first sensor to detect pressure signals in an inner conduit of the tool string and at least a second sensor to detect pressure signals in an annulus outside the tool string. A controller actuates a tool in the tool string in response to a logical combination of outputs from the sensors, where the outputs of the sensors are responsive to the respective pressure signals.Type: ApplicationFiled: July 25, 2008Publication date: January 28, 2010Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: David Merlau, Lang Zhan, Dhandayuthapani Kannan, Jim B. Benton
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Publication number: 20090159275Abstract: A technique is provided for optimizing well production. Intervals are selected along a deviated wellbore, and a well test and treatment string is deployed in the wellbore. Each interval is then isolated to enable performance of desired testing. The test data obtained is evaluated to determine an appropriate remedial action which is then implemented via the well test and treatment string. The system and method enable the testing and treatment of a plurality of intervals along a horizontal well during the same run downhole.Type: ApplicationFiled: December 20, 2007Publication date: June 25, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Dhandayuthapani Kannan, David E. Sask, Lang Zhan, James G. Filas
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Patent number: 7478555Abstract: A technique that is usable with a well includes communicating fluid from the well into a downhole chamber in connection with a well testing operation. The technique includes monitoring a downhole parameter that is responsive to the communication to determine when to close the chamber.Type: GrantFiled: August 25, 2005Date of Patent: January 20, 2009Assignee: Schlumberger Technology CorporationInventors: Lang Zhan, James G. Filas, Dhandayuthapani Kannan
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Publication number: 20090000785Abstract: The invention relates to fluid sampling in a test that is used to determine physical and chemical characteristics of the fluids in a subterranean reservoir. The method reconstructs the entire pressure history of the fluid parcel that is captured in the fluid samplers during a test. Using this reconstructed pressure history of the samples, the quality of the samples, particularly, whether there is a phase change in the samples during the test, can be accurately quantified.Type: ApplicationFiled: June 26, 2007Publication date: January 1, 2009Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Lang Zhan, Dhandayuthapani Kannan, James G. Filas, Graham Birkett
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Publication number: 20080210420Abstract: Methods and apparatus for improving the determination of at least one multiphase flow parameter of an earth formation comprising propagating within the formation a first salinity front, determining a first value of the at least one multiphase flow parameter, propagating in the formation a second salinity front and improving the determination of the at least one multiphase flow parameter from the first value for the at least one multiphase flow parameter and a saturation profile associated with the first and second salinity fronts within the formation.Type: ApplicationFiled: March 3, 2008Publication date: September 4, 2008Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Terizhandur S. Ramakrishnan, Fikri John Kuchuk, Yusuf Bilgin Altundas, Lang Zhan
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Publication number: 20070162235Abstract: Based on measurements that are obtained from a well test, a pressure in the well is modeled as a function of at least a skin effect factor that varies with time. The results of the modeling may be used to estimate at least one well parameter, such as a formation parameter and/or a well pressure, as examples.Type: ApplicationFiled: February 13, 2007Publication date: July 12, 2007Applicant: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Lang Zhan, Fikri Kuchuk, James Filas, Dhandayuthapani Kannan
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Publication number: 20070050145Abstract: A technique that is usable with a well includes communicating fluid from the well into a downhole chamber in connection with a well testing operation. The technique includes monitoring a downhole parameter that is responsive to the communication to determine when to close the chamber.Type: ApplicationFiled: August 25, 2005Publication date: March 1, 2007Inventors: Lang Zhan, James Filas, Dhandayuthapani Kannan