Experimental research on a new encapsulated heat-generating hydraulic fracturing fluid system

被引：0

作者：

吴金桥 ^{[1
]}

张宁生 ^{[2
]}

吴新民 ^{[2
]}

刘晓娟 ^{[2
]}

机构：

[1] School of Energy and Power Engineering, Xi’an Jiaotong University

[2] School of Petroleum Engineering, Xi’an Shiyou University

来源：

Chinese Journal of Geochemistry | 2006年 / 02期

关键词：

hydraulic fracturing fluid; encapsulated; chemical heat-generating agent; compatibility; gel breaking;

D O I：

暂无

中图分类号：

TE357.1 [];

学科分类号：

082002 ;

摘要：

During fracturing treatment for low-temperature, shallow and high freezing point oil reservoirs, the first-line problems are to overcome uncompleted breakdown, uncompleted cleanup of fracturing fluids and cold damages to the formations by injecting cold fluid. To avoid those problems, it is suggested to adopt a new encapsulated heat-generating hydraulic fracturing fluid system as described in this paper.; Firstly, two kinds of chemical heat-generating systems were studied and the NH-4Cl-NaNO-2 system was selected. According to the reaction characteristics of the system, oxalic acid was chosen as a catalyst of reaction and encapsulated using ethyl cellulose and paraffin as coating materials by the phase separation method. Compatibility of NH-4Cl-NaNO-2-encapsulated oxalic acid with hydroxypropyl-guar fracturing fluid was also discussed in the paper. The results showed that the hydraulic fracturing fluid containing encapsulated heat-generating agents hare a good stability and compatibility. When the fracturing fluid contains {2.0} mol·L+{-1} NH-4Cl-NaNO-2, {0.93%} encapsulated oxalic acid and {0.08%} ammonium persulfate, the peak temperature can reach {78.0℃} and the viscosity of residual liquid is {3.12} mPa·s after 4 hours.

引用

页码：162 / 166

页数：5