Method for evaluating plugging effect of drilling fluid for crack expansion type leakage reservoir
The invention discloses a method for evaluating the plugging effect of drilling fluid for a crack expansion type leakage reservoir. The method comprises the following steps: determining the gas logging initial permeability of a core in a research target area by utilizing the Darcy law; placing a to-...
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Main Authors | , , , , |
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Format | Patent |
Language | Chinese English |
Published |
14.03.2023
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Subjects | |
Online Access | Get full text |
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Summary: | The invention discloses a method for evaluating the plugging effect of drilling fluid for a crack expansion type leakage reservoir. The method comprises the following steps: determining the gas logging initial permeability of a core in a research target area by utilizing the Darcy law; placing a to-be-evaluated drilling fluid into the roller furnace, performing hot rolling at the formation temperature, pouring the to-be-evaluated drilling fluid into the intermediate container, opening a valve at the outlet end of the core holder, displacing the drilling fluid in a constant-pressure manner, and recording the invasion amount of the drilling fluid at different displacement time; determining the plugging layer forming time and the plugging layer average permeability of the drilling fluid according to the invasion amount of the drilling fluid; evaluating the plugging effect of the drilling fluid through the plugging efficiency coefficient of the drilling fluid; compared with a traditional method, the method provid |
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Bibliography: | Application Number: CN202211410832 |