The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 2016
Filed:
Sep. 26, 2012
China Petroleum & Chemical Corporation, Beijing, CN;
Sinopec Research Institute of Petroleum Engineering, Beijing, CN;
Xiaohua Yang, Beijing, CN;
Lin Wang, Beijing, CN;
Yongxue Lin, Beijing, CN;
Sheng Li, Beijing, CN;
Long Chai, Beijing, CN;
Xiaoqiang Dong, Beijing, CN;
China Petroleum & Chemical Corporation, Beijing, CN;
SINOPEC Research Institute of Petroleum Engineering, Beijing, CN;
Abstract
The present invention provides a filtration control agent and a drilling fluid containing the same. The filtration control agent comprises the product obtained from the reaction of water, lignite, aldehyde and sulfonate polymer at 180-220° C. and the units containing sulfonate groups in the molecular chains of sulfonate polymer are at least 30 wt %. The filtration control agent provided by the present invention features a good filtration loss reduction effect and a low viscosity effect and can improve the rheological behavior of the drilling fluid, thereby meeting the requirements of the drilling of deep wells, ultra-deep wells and ultra high pressure formations.