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Development and application of ultrahigh temperature antisalt polymer fluid loss reducer
HUANG Weian1, QIU Zhengsong1, XU Jiafang1, XUE Yuzhi2, LI Gongrang1,2, JIANG Lin1
(1.College of Petroleum Engineering in China University of Petroleum, Qingdao 266555, China;2.Research Institute of Drilling Technology of Shengli Petroleum Administrative Bureau, Dongying 257017, China)
Abstract:
Aimed at the present outstanding problem of filtration property adjusting and controlling and high temperature stability of ultrahigh temperature water base drilling fluid around the world, the ultrahigh temperature antisalts polymer fluid loss reducer HTP1 was developed. The action mechanisms of HTP1 are as follows:(1) HTP1 are largely and hardly adsorbed on clay particles and little changed by salt and temperature.(2) HTP1 can improve particle size grading, reduce the permeability and improve compressibility observably of filter cake. Field application results of the polymer fluid loss reducer HTP1 in ultradeep well Shengke 1 and Bishen 1 show that the tolerance of HTP1 to temperature is up to 240 ℃, to salt above 20%. The performances of HTP1 in several base slurries have an advantage of treating agents around the world, and HTP1 could meet the demand of ultradeep well drilling under ultrahigh temperature.
Key words:  drilling fluid  ultrahigh temperature  deep well  fluid loss reducer  action mechanism