Drilling fluid additive composition and water-based drilling fluid suitable for high-pressure plugging

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United States of America Patent

PATENT NO 9890318
SERIAL NO

15636014

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Abstract

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The present invention relates to the well drilling field in petroleum industry, in particular to a drilling fluid additive composition and a water-based drilling fluid suitable for high pressure plugging while drilling. The composition contains a bridging agent, a nano-plugging agent, a rheological modifier, a bionic wall bracing agent, and a bionic shale inhibitor, wherein, the bridging agent is a weak-crosslinked copolymer, in which the content of cross-linker structures is 0.1-1 wt. %; the nano-plugging agent is modified nanometer silicon dioxide particles; the rheological modifier is a dimer acid-organic amine copolymer; and the bionic wall bracing agent is carboxymethyl chitosan with a dopamine-derived base group grafted on its main chain. With a synergistic effect among the bridging agent, the nano-plugging agent, the rheological modifier, the bionic wall bracing agent, and the bionic shale inhibitor in the composition provided in the present invention, the water-based drilling fluid containing the composition as additive can attains an excellent plugging effect in a drilling process.

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Patent Owner(s)

Patent OwnerAddress
CHINA UNIVERSITY OF PETROLEUM (BEIJING)102249 BEIJING CITY CHANGPING DISTRICT ROAD NO 18 BEIJING CITY BEIJING CITY 102249

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cheng, Lin Beijing, CN 189 1423
Gao, Deli Beijing, CN 18 13
Ge, Qingying Beijing, CN 3 5
He, Yinbo Beijing, CN 28 32
Hu, Jingdong Beijing, CN 2 0
Jiang, Guancheng Beijing, CN 47 76
Liu, Chong Beijing, CN 102 454
Liu, Fan Beijing, CN 63 244
Ma, Guangchang Beijing, CN 11 22
Peng, Chunyao Beijing, CN 13 8
Qin, Yong Beijing, CN 85 1289
Sun, Haifang Beijing, CN 10 35
Wang, Yong Shenyang, CN 1107 9670
Wang, Zhaohui Beijing, CN 84 291
Yang, Lili Beijing, CN 79 546
Zhang, Yongqing Beijing, CN 16 45

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