Patents by Inventor Caimu Tang
Caimu Tang 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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Patent number: 9797242Abstract: A method for receiving an encoded integer includes acquiring a digitized waveform including a first plurality of pulses distributed among a second plurality of time slots, locating each of the pulses in the digitized waveform, computing a confidence value for each of the pulses, selecting a subset of the plurality of pulses, the subset including pulses having low confidence values computed, generating a set of unique waveforms corresponding to various combinations of the subset of pulses selected, computing a cross-correlation between each of the waveforms generated and the digitized waveform acquired, and selecting the waveform having the highest cross-correlation computed.Type: GrantFiled: May 16, 2014Date of Patent: October 24, 2017Assignee: SCHLUMBERGER TECHNOLOGY CORPORATIONInventors: Caimu Tang, Mark S. Beattie
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Patent number: 9273517Abstract: A closed-loop method for geosteering includes acquiring logging while drilling data and processing the logging while drilling data downhole while drilling to obtain a geosteering correction (a correction to the drilling direction based upon the LWD measurements). The geosteering correction is further processed downhole to obtain new steering tool settings which are then applied to the steering tool to change the direction of drilling. These steps are typically repeated numerous times without the need for uphole processing or surface intervention.Type: GrantFiled: August 19, 2010Date of Patent: March 1, 2016Assignee: Schlumberger Technology CorporationInventors: Borislav J. Tchakarov, Tsili Wang, Rodney S. Guenther, Thanh H. Cao, Caimu Tang
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Publication number: 20140254322Abstract: A method for receiving an encoded integer includes acquiring a digitized waveform including a first plurality of pulses distributed among a second plurality of time slots, locating each of the pulses in the digitized waveform, computing a confidence value for each of the pulses, selecting a subset of the plurality of pulses, the subset including pulses having low confidence values computed, generating a set of unique waveforms corresponding to various combinations of the subset of pulses selected, computing a cross-correlation between each of the waveforms generated and the digitized waveform acquired, and selecting the waveform having the highest cross-correlation computed.Type: ApplicationFiled: May 16, 2014Publication date: September 11, 2014Applicant: Schlumberger Technology CorporationInventors: Caimu Tang, Mark S. Beattie
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Patent number: 8788206Abstract: Borehole image data is compressed and transmitted to the surface one or more pixilated traces at a time. The compression methodology typically includes transform, quantization, and entropy encoding steps. The invention advantageously provides an efficient fixed point Karhünen-Loève like transform for compressing sensor data. A significant reduction in latency is achieved as compared to the prior art.Type: GrantFiled: April 23, 2008Date of Patent: July 22, 2014Assignee: Schlumberger Technology CorporationInventor: Caimu Tang
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Patent number: 8730764Abstract: A method for encoding a non-negative integer, for example, representative of MWD/LWD data, includes encoding at least a portion of the integer using at least a first order Fibonacci derived sequence. The remainder of the integer may be encoded using conventional Fibonacci encoding. The invention tends to improve coding efficiency, downhole and surface synchronization, and surface detection.Type: GrantFiled: July 30, 2009Date of Patent: May 20, 2014Assignee: Schlumberger Technology CorporationInventors: Caimu Tang, Mark S Beattie
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Publication number: 20120163523Abstract: A method for synchronizing a waveform received in a subterranean borehole with a transmitted waveform includes at least one of a phase synchronization, a symbol synchronization, or a frame synchronization method. The phase and symbol synchronization methods make use of distinct loop filters which process corresponding feedback signals so as to output phase clock and symbol clock adjustments. Frame synchronization methods accumulate a preamble correlation on a symbol stream having at least one repeating preamble.Type: ApplicationFiled: December 22, 2010Publication date: June 28, 2012Applicant: SMITH INTERNATIONAL, INC.Inventor: Caimu Tang
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Publication number: 20120046868Abstract: A closed-loop method for geosteering includes acquiring logging while drilling data and processing the logging while drilling data downhole while drilling to obtain a geosteering correction (a correction to the drilling direction based upon the LWD measurements). The geosteering correction is further processed downhole to obtain new steering tool settings which are then applied to the steering tool to change the direction of drilling. These steps are typically repeated numerous times without the need for uphole processing or surface intervention.Type: ApplicationFiled: August 19, 2010Publication date: February 23, 2012Applicant: SMITH INTERNATIONAL, INC.Inventors: Borislav J. Tchakarov, Tsili Wang, Rodney S. Guenther, Thanh H. Cao, Caimu Tang
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Patent number: 8024121Abstract: Borehole image data is compressed and transmitted to the surface one pixilated trace at a time. The compression methodology typically includes transform, quantization, and entropy encoding steps. The invention advantageously provides for sufficient data compression to enable conventional telemetry techniques (e.g., mud pulse telemetry) to be utilized for transmitting borehole images to the surface. By compressing and transmitting sensor data trace by trace the invention also tends to significantly reduce latency.Type: GrantFiled: January 25, 2008Date of Patent: September 20, 2011Assignee: Smith International, Inc.Inventor: Caimu Tang
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Publication number: 20110026362Abstract: A method for encoding a non-negative integer, for example, representative of MWD/LWD data, includes encoding at least a portion of the integer using at least a first order Fibonacci derived sequence. The remainder of the integer may be encoded using conventional Fibonacci encoding. The invention tends to improve coding efficiency, downhole and surface synchronization, and surface detection.Type: ApplicationFiled: July 30, 2009Publication date: February 3, 2011Applicant: SMITH INTERNATIONAL, INC.Inventors: Caimu Tang, Mark S. Beattie
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Publication number: 20090192711Abstract: Borehole image data is compressed and transmitted to the surface one pixilated trace at a time. The compression methodology typically includes transform, quantization, and entropy encoding steps. The invention advantageously provides for sufficient data compression to enable conventional telemetry techniques (e.g., mud pulse telemetry) to be utilized for transmitting borehole images to the surface. By compressing and transmitting sensor data trace by trace the invention also tends to significantly reduce latency.Type: ApplicationFiled: January 25, 2008Publication date: July 30, 2009Applicant: PathFinder Energy Services, Inc.Inventor: Caimu Tang
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Publication number: 20090190850Abstract: Borehole image data is compressed and transmitted to the surface one or more pixilated traces at a time. The compression methodology typically includes transform, quantization, and entropy encoding steps. The invention advantageously provides an efficient fixed point Karhünen-Loève like transform for compressing sensor data. A significant reduction in latency is achieved as compared to the prior art.Type: ApplicationFiled: April 23, 2008Publication date: July 30, 2009Applicant: PathFinder Energy Services, Inc.Inventor: Caimu Tang