The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform
Werner Miska - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the use of a down-hole mechanical cleaning device for efficient wellbore cleaning
2007Co-Authors: A. Qureshi, Serge Miska, Werner MiskaAbstract:The tool analyzed for this study is called the Mechanical Cleaning Device (MCD, see Fig. A-1) and is an integral Drill String Component consisting of a short mandrel with no moving parts, shaped in such a way so as to stimulate any cuttings which have a tendency to settle out of the mud in the high angled sections of the well bore. These sections could be inside the casing or in open hole; the tool is adaptable to suit several environments. Testing on the MCD was carried out on the Tulsa University Drilling Research Projects’ Low Pressure Ambient Temperature (LPAT) flow loop (Fig. A-2). The LPAT flow loop is a well bore simulator which can be used to carry out experiments for a wide range of input parameters like flow rate, Drilling fluid type, cuttings size and type, rate of penetration (ROP), Drill String rotational speed (RPM), and different hole inclination angles. It consists of a 100 feet long transparent test section with a 4-1/2 OD Drill pipe in an 8 ID outer acrylic pipe. The use of acrylic for the outer pipe facilitates visual observations of flow patterns in the annulus. A centrifugal pump is used to establish the flow of the Drilling fluid from the mud tank. The injection tank and the auger are used to inject cuttings into the fluid stream, at a specified rate of penetration, into the test section. This closely simulates a Drilling process. The cuttings travel and form a bed in the test section. They flow through the upper end of the flow loop into the shale shaker, which separates the cuttings and the fluid. The cuttings fall into the cuttings collection tank and the Drilling fluid goes into the mud tank. At steady state, the rate of injection (ROI) equals the rate of collection (ROC) and, depending upon the flow rate and inclination angle, a cuttings bed is formed in the test
A. Qureshi - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the use of a down-hole mechanical cleaning device for efficient wellbore cleaning
2007Co-Authors: A. Qureshi, Serge Miska, Werner MiskaAbstract:The tool analyzed for this study is called the Mechanical Cleaning Device (MCD, see Fig. A-1) and is an integral Drill String Component consisting of a short mandrel with no moving parts, shaped in such a way so as to stimulate any cuttings which have a tendency to settle out of the mud in the high angled sections of the well bore. These sections could be inside the casing or in open hole; the tool is adaptable to suit several environments. Testing on the MCD was carried out on the Tulsa University Drilling Research Projects’ Low Pressure Ambient Temperature (LPAT) flow loop (Fig. A-2). The LPAT flow loop is a well bore simulator which can be used to carry out experiments for a wide range of input parameters like flow rate, Drilling fluid type, cuttings size and type, rate of penetration (ROP), Drill String rotational speed (RPM), and different hole inclination angles. It consists of a 100 feet long transparent test section with a 4-1/2 OD Drill pipe in an 8 ID outer acrylic pipe. The use of acrylic for the outer pipe facilitates visual observations of flow patterns in the annulus. A centrifugal pump is used to establish the flow of the Drilling fluid from the mud tank. The injection tank and the auger are used to inject cuttings into the fluid stream, at a specified rate of penetration, into the test section. This closely simulates a Drilling process. The cuttings travel and form a bed in the test section. They flow through the upper end of the flow loop into the shale shaker, which separates the cuttings and the fluid. The cuttings fall into the cuttings collection tank and the Drilling fluid goes into the mud tank. At steady state, the rate of injection (ROI) equals the rate of collection (ROC) and, depending upon the flow rate and inclination angle, a cuttings bed is formed in the test
Serge Miska - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the use of a down-hole mechanical cleaning device for efficient wellbore cleaning
2007Co-Authors: A. Qureshi, Serge Miska, Werner MiskaAbstract:The tool analyzed for this study is called the Mechanical Cleaning Device (MCD, see Fig. A-1) and is an integral Drill String Component consisting of a short mandrel with no moving parts, shaped in such a way so as to stimulate any cuttings which have a tendency to settle out of the mud in the high angled sections of the well bore. These sections could be inside the casing or in open hole; the tool is adaptable to suit several environments. Testing on the MCD was carried out on the Tulsa University Drilling Research Projects’ Low Pressure Ambient Temperature (LPAT) flow loop (Fig. A-2). The LPAT flow loop is a well bore simulator which can be used to carry out experiments for a wide range of input parameters like flow rate, Drilling fluid type, cuttings size and type, rate of penetration (ROP), Drill String rotational speed (RPM), and different hole inclination angles. It consists of a 100 feet long transparent test section with a 4-1/2 OD Drill pipe in an 8 ID outer acrylic pipe. The use of acrylic for the outer pipe facilitates visual observations of flow patterns in the annulus. A centrifugal pump is used to establish the flow of the Drilling fluid from the mud tank. The injection tank and the auger are used to inject cuttings into the fluid stream, at a specified rate of penetration, into the test section. This closely simulates a Drilling process. The cuttings travel and form a bed in the test section. They flow through the upper end of the flow loop into the shale shaker, which separates the cuttings and the fluid. The cuttings fall into the cuttings collection tank and the Drilling fluid goes into the mud tank. At steady state, the rate of injection (ROI) equals the rate of collection (ROC) and, depending upon the flow rate and inclination angle, a cuttings bed is formed in the test
W. Dover - One of the best experts on this subject based on the ideXlab platform.
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Reduction in Fatigue Failures through Crack Detection by Alternating Current Field Measurement
IADC SPE Drilling Conference, 1996Co-Authors: T.m. Gaynor, D.l. Roberts, E. Homan, W. DoverAbstract:Once a crack is initiated by cyclic stress in a Drill String Component it will grow under further service loading and will fail when insufficient uncracked material remains to carry the applied load. Because the levels of cyclic and subsequent stress in Drilling may be unknown - or unknowable - the Drilling equipment supplier's main defence against Component fatigue failure (after design) is detection of the initial crack, conventionally by Magnetic Particle or Dye Penetrant Inspection. A clean bill of health from conventional inspection means no more than that no crack indications were found. The likely locations of cracks (e.g. thread roots in box connections) are often difficult to examine. Detection and interpretation are subjective, and depend on the skill of the inspector. A crack and a surface defect may be indistinguishable. No re-viewable evidence of Component inspection is left to allow an audit of inspection previously performed. Alternating Current Field Measurement (ACFM) induces a current in the surface of a Component. If ACFM detects a perturbation in the magnetic field created in the free space above the surface, a surface break is present. ACFM is able to determine length and depth, and hence the severity of any defect. It does not require a clear line of sight between operator and crack location. Because all data is recorded electronically, operator interpretation of results may be eliminated completely and any inspection revisited. The paper describes the theory of the technique, the equipment used and practical results from the first application of ACFM to downhole motor Components. The tests, conducted in the Middle East, allowed complete confidence that an ACFM clean bill of health meant no cracks and not no cracks discovered. Components laid down on hours or MPI crack indications were returned to service when ACFM reinspection found no cracks. During the period of the pilot test, no downhole motor fatigue failures occurred.
T.m. Gaynor - One of the best experts on this subject based on the ideXlab platform.
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Reduction in Fatigue Failures through Crack Detection by Alternating Current Field Measurement
IADC SPE Drilling Conference, 1996Co-Authors: T.m. Gaynor, D.l. Roberts, E. Homan, W. DoverAbstract:Once a crack is initiated by cyclic stress in a Drill String Component it will grow under further service loading and will fail when insufficient uncracked material remains to carry the applied load. Because the levels of cyclic and subsequent stress in Drilling may be unknown - or unknowable - the Drilling equipment supplier's main defence against Component fatigue failure (after design) is detection of the initial crack, conventionally by Magnetic Particle or Dye Penetrant Inspection. A clean bill of health from conventional inspection means no more than that no crack indications were found. The likely locations of cracks (e.g. thread roots in box connections) are often difficult to examine. Detection and interpretation are subjective, and depend on the skill of the inspector. A crack and a surface defect may be indistinguishable. No re-viewable evidence of Component inspection is left to allow an audit of inspection previously performed. Alternating Current Field Measurement (ACFM) induces a current in the surface of a Component. If ACFM detects a perturbation in the magnetic field created in the free space above the surface, a surface break is present. ACFM is able to determine length and depth, and hence the severity of any defect. It does not require a clear line of sight between operator and crack location. Because all data is recorded electronically, operator interpretation of results may be eliminated completely and any inspection revisited. The paper describes the theory of the technique, the equipment used and practical results from the first application of ACFM to downhole motor Components. The tests, conducted in the Middle East, allowed complete confidence that an ACFM clean bill of health meant no cracks and not no cracks discovered. Components laid down on hours or MPI crack indications were returned to service when ACFM reinspection found no cracks. During the period of the pilot test, no downhole motor fatigue failures occurred.
