推荐实施规程13M提供了确定石油和天然气行业中使用的完井液粘度的一致方法。在某些情况下，还提供了确定流体流变特性的方法。API RP 13M的这个版本是ISO 13503-1《石油和天然气工业-完井液和材料第1部分:完井液粘性特性的测量》的相同国家采用版本。

Recommended Practice 13M provides consistent methodology for determining the viscosity of completion fluids used in the petroleum and natural gas industries. For certain cases, methods are also provided to determine the rheological properties of a fluid.This edition of API RP 13M is the identical national adoption of ISO 13503-1, Petroleum and natural gas industries- Completion fluids and materials-Part 1: Measurement of viscous properties of completion fluids.