API会标计划生效日期:2020年10月1日本规范涵盖了用于油气井钻井液的材料的物理性能和测试程序。覆盖的材料是重晶石；赤铁矿；膨润土；未经处理的膨润土；凹凸棒石；海泡石；技术级低粘度羧甲基纤维素（CMC-LVT）；技术级高粘度羧甲基纤维素（CMC-HVT）；淀粉低粘度聚阴离子纤维素（PAC-LV）；高粘度聚阴离子纤维素（PAC-HV）；和钻井级黄原胶。本规范适用于指定产品的制造商、分销商和最终用户。附录A（资料性附录）包含API会标计划的信息，以及许可证持有人批准使用API会标的要求。

API MONOGRAM PROGRAM EFFECTIVE DATE: OCTOBER 1, 2020This specification covers physical properties and test procedures for materials manufactured for use in oil- and gas-well drilling fluids. The materials covered are barite; hematite; bentonite; non-treated bentonite; attapulgite; sepiolite; technical grade, low-viscosity carboxymethyl cellulose (CMC-LVT); technical grade, high-viscosity carboxymethyl cellulose (CMC-HVT); starch; low-viscosity polyanionic cellulose (PAC-LV); high-viscosity polyanionic cellulose (PAC-HV); and drilling-grade xanthan gum. This specification is intended for the use of manufacturers, distributors, and end users of named products. Annex A (informative) contains information on the API Monogram Program and requirements for the approved use of the API Monogram by licensees.