The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
E.y. Nakagawa - One of the best experts on this subject based on the ideXlab platform.
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Development and verification of a dynamic underbalanced drilling simulator
1997Co-Authors: Zhihua Wang, Erlend H. Vefring, Rolv Rommetveit, T. Bieseman, R. Maglione, Antonio C.v.m. Lage, E.y. NakagawaAbstract:A dynamic underbalanced drilling (UBD) simulator has been developed in a joint industry project. The simulator incorporates models for multiphase flow, well-reservoir interaction, gas/oil solubility and gas injection systems. The fluid components in the system include injected gases, mud, produced gas, produced oil and water and drilled cuttings. Both coiled tubing and conventional jointed Pipe can be simulated. The primary use of the simulator is in the planning phase of an UBD operation. An UBD operation is very dynamic due to the changes in flow conditions and other operations. The importance of the dynamic effects is illustrated by a field example. The dynamic simulator allows for the analysis of various operations that cannot be analyzed with a steady state simulator. Some of these operations include starting/stopping circulation; various gas injection techniques, e.g.: parasitic string, parasitic casing, through completion, and drill string injection; drilling operations: drilling, Tripping, Pipe connections, and BHA deployment. To verify the simulator, two phase flow tests in near-horizontal annulus were performed in order to provide data for validation. Field data are actively collected for this purpose. In this paper, two field cases are presented. One is a coiled tubing drilling operation in Dalen field in the Netherlandsmore » where a Nitrogen lift test was performed in a through completion configuration. The second case is a UBD operation in Candeias field in Brazil. In this case, drillstring gas injection tests were performed in a cemented 9-5/8-in. casing at 1,800 m.« less
Z. Kaiji - One of the best experts on this subject based on the ideXlab platform.
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Dynamic model predicts well bore surge and swab pressures
Oil & Gas Journal, 1996Co-Authors: Z. Bing, Z. KaijiAbstract:A dynamic well control model predicts surge and swab pressures more accurately than a steady-state model, thereby providing better estimates of pressure fluctuations when Pipe is tripped. Pressure fluctuations from Tripping Pipe into a well can contribute to lost circulation, kicks,and well control problems. This dynamic method of predicting surge and swab pressures was verified in a full-scale test well in the Zhong Yuan oil field in China. Both the dynamic model and steady state model were verified through the test data. The test data showed the dynamic model can correctly predict downhole pressures from running or pulling Pipe in a well; steady state models may result in relatively large prediction errors, especially in deeper wells.
Husiyandi A L Husni - One of the best experts on this subject based on the ideXlab platform.
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CFD SIMULATION OF SURGE AND SWAB PRESURES IN CONCENTRIC AND ECCENTRIC ANNULI USING POWER-LAW FLUID
2020Co-Authors: Husiyandi A L HusniAbstract:In deepwater exploration, wellbore pressure stability must be maintained to avoid a catastrophic accident such as blowout. Accounting for the factors contributing to wellbore pressure is beneficial to ensuring the stability of the wellbore. In this study, a Computational Fluid Dynamic (CFD) is used to simulate the surge and swab pressure in concentric and eccentric annular geometry using Power-Law fluid. The study fully utilises the CFD software: ANSYS 15.0 and the Fluid Flow (CFX) model to analyse the major factors that affects surge/swab pressure. These include; Tripping Pipe velocity, wellbore geometry, fluid rheology, Pipe eccentricity, flow regime and whether the Pipe is closed or open. The model geometries were designed with ANSYS workbench and meshed with tetrahedron elements for concentric annulus and hexahedron elements for eccentric annulus. Grid independent study was performed to compute an optimum mesh size to reduce the computational time to run the simulations. The simulation results are compared with the experimental results both for concentric and eccentric annulus using four (4) different types of test fluids (1.00% PAC-A, 0.75% PAC-A, 1.00% PAC-B, and 0.75% PAC-B).
Zhihua Wang - One of the best experts on this subject based on the ideXlab platform.
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Development and verification of a dynamic underbalanced drilling simulator
1997Co-Authors: Zhihua Wang, Erlend H. Vefring, Rolv Rommetveit, T. Bieseman, R. Maglione, Antonio C.v.m. Lage, E.y. NakagawaAbstract:A dynamic underbalanced drilling (UBD) simulator has been developed in a joint industry project. The simulator incorporates models for multiphase flow, well-reservoir interaction, gas/oil solubility and gas injection systems. The fluid components in the system include injected gases, mud, produced gas, produced oil and water and drilled cuttings. Both coiled tubing and conventional jointed Pipe can be simulated. The primary use of the simulator is in the planning phase of an UBD operation. An UBD operation is very dynamic due to the changes in flow conditions and other operations. The importance of the dynamic effects is illustrated by a field example. The dynamic simulator allows for the analysis of various operations that cannot be analyzed with a steady state simulator. Some of these operations include starting/stopping circulation; various gas injection techniques, e.g.: parasitic string, parasitic casing, through completion, and drill string injection; drilling operations: drilling, Tripping, Pipe connections, and BHA deployment. To verify the simulator, two phase flow tests in near-horizontal annulus were performed in order to provide data for validation. Field data are actively collected for this purpose. In this paper, two field cases are presented. One is a coiled tubing drilling operation in Dalen field in the Netherlandsmore » where a Nitrogen lift test was performed in a through completion configuration. The second case is a UBD operation in Candeias field in Brazil. In this case, drillstring gas injection tests were performed in a cemented 9-5/8-in. casing at 1,800 m.« less
Z. Bing - One of the best experts on this subject based on the ideXlab platform.
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Dynamic model predicts well bore surge and swab pressures
Oil & Gas Journal, 1996Co-Authors: Z. Bing, Z. KaijiAbstract:A dynamic well control model predicts surge and swab pressures more accurately than a steady-state model, thereby providing better estimates of pressure fluctuations when Pipe is tripped. Pressure fluctuations from Tripping Pipe into a well can contribute to lost circulation, kicks,and well control problems. This dynamic method of predicting surge and swab pressures was verified in a full-scale test well in the Zhong Yuan oil field in China. Both the dynamic model and steady state model were verified through the test data. The test data showed the dynamic model can correctly predict downhole pressures from running or pulling Pipe in a well; steady state models may result in relatively large prediction errors, especially in deeper wells.
