# US 11,078,395 B2 · Wellbore drilling compositions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,078,395 B2 - Document ID: US11078395B2 - Status: Granted - Kind: B2 - Application number: 16/712,322 - Filed: 2019-12-12 - Published: 2020-06-18 - Granted: 2021-08-03 - Earliest claimed: 2018-12-12 - Assignees: Chevron Phillips Chemical Company LP - Applicants: Chevron Phillips Chemical Company LP - Inventors: Mario A. Ramirez; Marshall D. Bishop - Web page: https://patentgrep.com/patent/US11078395B2 ## CPC - C09K 8/035: Organic additives - C09K 8/12: containing synthetic organic macromolecular compounds or their precursors - C09K 8/34: Organic liquids - C09K 2208/28: Friction or drag reducing additives - C09K 2208/34: Lubricant additives - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE ## Abstract Drilling mud compositions including a first concentration of powdered latex and a second concentration of SAS are described. The second concentration of SAS can be greater than or equal to the first concentration of latex. In some examples, the second concentration of SAS can be greater than the first concentration of latex. The drilling mud compositions may include an oil-based carrier, or a water-based carrier. An example technique includes dispersing a first predetermined amount of powdered latex and a second predetermined amount of SAS in a water-based carrier to form a water-based mud. Another example technique includes dispersing a first predetermined amount of powdered latex and a second predetermined amount of SAS in an oil-based carrier to form an oil-based mud. ## Claims ### Claim 1 A drilling mud composition, comprising a solid-state lubricant, wherein the solid-state lubricant comprises: a first concentration of powdered latex; and a second concentration of sodium asphalt sulfonate (SAS), wherein the second concentration of SAS (by mass) is greater than or equal to the first concentration of latex (by mass), wherein the drilling mud composition comprises an oil-based carrier, wherein the first concentration of powdered latex is at least about 1 pounds per barrel (lbm/bbl) with respect to the drilling mud composition, wherein the powdered latex comprises at least one of a styrene butadiene copolymer or a vinyl acetate ethylene copolymer, and wherein the drilling mud composition has an average permeability plugging test (PPT) fluid loss at 300° F. with a 55 micrometer filtration disc of less than or about 1.06 mL when tested according to American Petroleum Institute (API) test 13B-2. ### Claim 2 (depends on 1) The drilling mud composition of claim 1, wherein the second concentration of SAS is greater than the first concentration of latex. ### Claim 3 (depends on 1) The drilling mud composition of claim 1, wherein the powdered latex has a population-averaged particle size in a range from about 70 micrometers to about 100 micrometers. ### Claim 4 (depends on 3) The drilling mud composition of claim 3, wherein the population-averaged particle size is in a range from about 80 micrometers to about 90 micrometers. ### Claim 5 (depends on 4) The drilling mud composition of claim 4, wherein the population-averaged particle size is about 85 micrometers. ### Claim 6 (depends on 1) The drilling mud composition of claim 1, wherein the drilling mud composition has a plastic viscosity at 120° F. in a range of from about 20 cP to about 30 cP when tested according to API test 13B-2. ### Claim 7 (depends on 1) The drilling mud composition of claim 1, wherein the drilling mud composition has a yield point at 120° F. in a range of from about 5 lb/100 ft2 to about 6 lb/100 ft2when tested according to API test 13B-2. ### Claim 8 (depends on 1) The drilling mud composition of claim 1, wherein the drilling mud composition has a 10-second gel strength at 120° F. in a range between about 2 to about 11 lb/100 ft2 when tested according to API test 13B-2. ### Claim 9 (depends on 1) The drilling mud composition of claim 1, wherein the drilling mud composition has a 10-minute gel strength at 120° F. in a range between about 10 to about 40 lb/100 ft2 when tested according to API test 13B-2. ### Claim 10 (depends on 1) The drilling mud composition of claim 1, wherein the first concentration of powdered latex is about 1 lbm/bbl, and wherein the second concentration of SAS is about 3 lbm/bbl. ### Claim 11 (depends on 1) The drilling mud composition of claim 1, wherein the first concentration of powdered latex is in a range from about 1.5 to about 2.5 lbm/bbl, and wherein the second concentration of SAS is in a range from about 1.5 to about 2.5 lbm/bbl. ### Claim 12 (depends on 1) The drilling mud composition of claim 1, wherein the first concentration of powdered latex is about 2 lbm/bbl, and wherein the second concentration of SAS is about 2 lbm/bbl. ### Claim 13 (depends on 1) A method comprising dispersing a first predetermined amount of powdered latex and a second predetermined amount of SAS in an oil-based carrier to form an oil-based mud comprising the composition of claim 1.