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Languages : en
Pages : 22
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Book Description
The program objective was to develop a Near-Bit Measurement-While-Drilling (MWD) system which collects borehole directional data and formation parameters directly at the drill bit-rock interface and transmits this information electromagnetically to a distant receiver located some 50--100 feet above the bit. The system is to be designed to work with positive-displacement motors and stabilized bottomhole assemblies from all manufacturers and to pass its data message to third party steering tools and conventional MWD telemetry systems for subsequent transmission to the surface. The basic design of the Near-Bit MWD system is based upon commercially successful AccuNav{reg_sign} EM MWD guidance system. This system is widely employed in under-river utility crossings and environmental remediation activities. The system has been demonstrated to be accurate and extremely reliable in these applications. The Phase 2 objective was to incorporate a formation-measuring sensor and to assess the system performance and reliability in a series of field experiments. Based on the results of these tests, final design modifications were to be implemented in support of commercialization. The genesis for a Near-Bit MWD system which can be operated with commercial MWD or wireline steering tools and bottomhole directional assemblies responds to the need for enhanced information to support directional drilling operations in general, and horizontal drilling in particular.
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Category :
Languages : en
Pages : 22
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Book Description
The program objective was to develop a Near-Bit Measurement-While-Drilling (MWD) system which collects borehole directional data and formation parameters directly at the drill bit-rock interface and transmits this information electromagnetically to a distant receiver located some 50--100 feet above the bit. The system is to be designed to work with positive-displacement motors and stabilized bottomhole assemblies from all manufacturers and to pass its data message to third party steering tools and conventional MWD telemetry systems for subsequent transmission to the surface. The basic design of the Near-Bit MWD system is based upon commercially successful AccuNav{reg_sign} EM MWD guidance system. This system is widely employed in under-river utility crossings and environmental remediation activities. The system has been demonstrated to be accurate and extremely reliable in these applications. The Phase 2 objective was to incorporate a formation-measuring sensor and to assess the system performance and reliability in a series of field experiments. Based on the results of these tests, final design modifications were to be implemented in support of commercialization. The genesis for a Near-Bit MWD system which can be operated with commercial MWD or wireline steering tools and bottomhole directional assemblies responds to the need for enhanced information to support directional drilling operations in general, and horizontal drilling in particular.
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Languages : en
Pages : 4
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As horizontal drilling and completion technology has improved through evolution, the length of the horizontal sections has grown longer and the need for more accurate directional placement become more critical. The reliance on examining formation conditions and borehole directional data some 50 to 80 feet above the bit becomes less acceptable as turning radii decrease and target sands become thinner. The project objective is to develop a measurements-while-drilling module that can reliably provide real-time reports of drilling conditions at the bit. The module is to support multiple types of sensors and to sample and encode their outputs in digital form under microprocessor control. The assembled message will then be electronically transmitted along the drill string back to a standard mud-pulse or EM-MWD tool for data integration and relay to the surface. The development effort will consist of reconfiguring the AccuNav{reg_sign} EM-MWD Directional System manufactured by Guided boring Systems, Inc. of Houston, Texas for near-bit operation followed by the inclusion of additional sensor types (e.g., natural gamma ray, formation resistivity, etc.) in Phase 2. The near-bit MWD prototype fabrication was completed and the system assembled and calibrated. The unit was then subjected to vibration and shock testing for a period in excess of 200 hours. In addition, the unit was completely disassembled and inspected at the conclusion of the reliability tests to assess damage or wear. No fall off in performance or damage to the electronics or battery pack were found. The performance of the telemetry link was also assessed. The tests demonstrated the ability to transmit and receive error-free data over a transmitter-to-receiver separation distance of 100 feet for both liquid-filled and dry boreholes.
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Category :
Languages : en
Pages : 4
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Book Description
The project objective is to develop a measurements-while-drilling module that can reliably provide real-time reports of drilling conditions at the bit. The module is to support multiple types of sensors and to sample and encode their outputs in digital form under microprocessor control. The assembled message will then be electromagnetically transmitted along the drill string back to a standard mud-pulse or EM MWD tool for data integration and relay to the surface. The development effort will consist of reconfiguring the AccuNav EM MWD Directional System manufactured and marketed by Guided Boring Systems, Inc. of Houston, Texas for near-bit use followed by the inclusion of additional sensor types in Phase 2. To maintain focus and provide the desired level of project control, work is divided into two phases. The current Phase 1 goal is to define system specifications followed by design, fabrication and testing of a functioning prototype. To minimize costs, the Phase 1 prototype will be configured with accelerometers, temperature and pressure. Phase 2 will consist of incorporating a selected data suite (adding other sensors such as gamma ray) and performing a series of field experiments. Before proceeding to the field test stage, a series of vibration cycle and shock tests will be performed to identify areas to strengthen through redesign and packaging modifications. Pending success of the field tests, final design modifications would be implemented and the system commercialized.
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Category :
Languages : en
Pages : 7
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Book Description
The project objective is to develop a measurements-while-drilling (MWD) module that provides real-time reports of drilling conditions at the bit. The module is to support multiple types of sensors and to sample and encode their outputs in digital form under microprocessor control. The assembled message is to be electromagnetically transmitted along the drill string back to its associated receiver located in a collar typically 50--100 feet above the bit. The receiver demodulates the transmitted message and passes it data to the third party wireline or MWD telemetry system for relay to the surface. The collar also houses the conventional MWD or wireline probe assembly. The completed Phase 1 program began with the preparation of detailed performance specifications and ended with the design, fabrication and testing of a functioning prototype. The prototype was sized for operation with 6-3/4-inch multi-lobe mud motors due to the widespread use of this size motor in horizontal and directional drilling applications. The Phase 1 prototype provided inclination, temperature and pressure information. The Phase 2 program objective is to expand the current sensor suite to include at least one type of formation evaluation measurement, such as formation resistivity or natural gamma ray. The Near-Bit system will be subjected to a vigorous series of shock and vibration tests followed by field testing to ensure it possesses the reliability and performance required for commercial success.
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Category : Power resources
Languages : en
Pages : 586
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Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
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Category : Geothermal engineering
Languages : en
Pages : 650
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Category : Science
Languages : en
Pages : 512
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Languages : en
Pages :
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Category : Aeronautics
Languages : en
Pages : 574
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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Category : Fossil fuels
Languages : en
Pages : 820
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