发明名称 |
Low fluid loss drilling fluid compositions comprising diblock copolymers |
摘要 |
The invention relates to a selectively hydrogenated isoprene-styrene diblock copolymer having a polystyrene content of at least 40 wt. %, which when added to an oil-based mud composition, substantially reduces fluid loss. The polystyrene in the diblock has a true molecular weight greater than 60 kg/mole and the total apparent molecular weight of the diblock copolymer is at least 160 kg/mole. The drilling mud that contains about 0.5 pounds per barrel to about 10 pounds per barrel of a selectively hydrogenated isoprene-styrene diblock copolymer and a weighting agent, resulting in a drilling fluid composition exhibiting good suspension of the weighting agent and improved fluid loss performance. |
申请公布号 |
US9394472(B2) |
申请公布日期 |
2016.07.19 |
申请号 |
US201414226890 |
申请日期 |
2014.03.27 |
申请人 |
Kraton Polymers U.S. LLC |
发明人 |
Murphy Erin;Bening Robert |
分类号 |
C09K8/32 |
主分类号 |
C09K8/32 |
代理机构 |
Clements Bernard PLLC |
代理人 |
Clements Bernard PLLC ;Serysheva Ekatherina |
主权项 |
1. A drilling fluid comprising an oil-based mud and a selectively hydrogenated isoprene-styrene diblock copolymer having at least a 40 wt. % polystyrene content and having an apparent total molecular weight of at least 160 kg/mole, wherein the fluid loss property of the drilling fluid is reduced. |
地址 |
Houston TX US |