Study on the Precipitation Pathway of Nanyishan Oilfield Brine at Subzero Temperatures

被引：6

作者：

Li Qing-Hai ^{[1
,4
]}

Gu Tong-Xin ^{[2
,3
]}

Yu Sheng-Song ^{[1
]}

Yao Yan ^{[1
]}

Li Bing ^{[1
]}

Li Wu ^{[1
]}

机构：

[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China

[2] Chinese Acad Sci, State Key Lab Frozen Soil Engn Cold & Arid Region, Lanzhou 730000, Peoples R China

[3] Chinese Acad Sci, Engn Res Inst, Lanzhou 730000, Peoples R China

[4] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

ACTA PHYSICO-CHIMICA SINICA | 2011年 / 27卷 / 08期

基金：

中国国家自然科学基金;

关键词：

Oilfield brine; Freezing; Hydrohalite; Ice; X-ray diffraction at subzero temperature;

D O I：

10.3866/PKU.WHXB20110823

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The crystallization processes of oilfield brine components from the Nanyishan area at temperature between -18.90 and -30.90 degrees C were studied by a self-designed refrigeration instrument and the precipitation temperatures of the first and second salts were measured accurately. The concentrations of the major ions (Ca2+, Mg2+, K+, Cl-, B2O3, Na+) in the liquid phase of the brine at different temperatures (from -18.90 to -30.90 degrees C) were determined by chemical analyses. The solids obtained at low temperature were identified and the phase changes of the oilfield brine at temperatures between -10.0 and -30.0 degrees C were monitored in situ by subzero temperature X-ray powder diffraction. The results show that the first salt (hydrohalite) precipitates at -19.10 degrees C and the ice and NaCl-2H(2)O co-precipitate at -23.55 degrees C.

引用

页码：1803 / 1808

页数：6

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