Importance

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Abstract

An equivalent circulating density (ECD) reduction tool can include a positive displacement fluid motor, and a fluid pump configured to be driven by the fluid motor. The fluid pump can include a fluid inlet and a fluid outlet disposed on respective opposite sides of an external flow restriction. A method of controlling equivalent circulating density (ECD) in a well can include connecting an ECD reduction tool in a tubular string, deploying the tubular string with the ECD reduction tool into the well, thereby forming an annulus between the tubular string and a well surface surrounding the tubular string, and flowing a fluid into the well through the tubular string, the fluid returning from the well via the annulus. The flowing step can include operating a positive displacement fluid motor of the ECD reduction tool, the fluid motor thereby rotating an impeller shaft of a fluid pump.

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First Claim