第34卷第2期 2017年3月
钻井液与
究
井液
DRILLINGFLUID&COMPLETIONFLUID
doi:10.3969/j.issn.1001-5620.2017.02.022
新型砂岩自转向酸体系的研究与应用高尚‘，符扬洋「，孟祥海"，刘长龙，王瑞？（1.中海石油（中国）有限公司天津分公司，天津300459；2.石油工业出版社，北京100020）
高尚，荐扬清 Gao Shang
fracturi
ng
中图分司
带
ngyan.12
Vol.34 No.2 Mar.2017
用[]钻井液与完井液，2017，34（2）：121-125
Lpplicationof a new self-diverting acid for use in sandstonc-125
优化开
自转
艾草
2017）02-0121-05
Studyand Application of a New Self-diverting Acid for Use in Sandstone Fracturing
GAO Shang', FU Yangyang', MENG Xianghai', LIU Changlong', WANG Rui?
(1.Tianjin Branch Company, CNOOC, Tianjin 300459;2.Petroleum Industry Press, Beijing 100020)
Abstract The main reservoirs in the Bohai oilfield are characteristic of big permeability differences between different production layers, and high heterogeneity. This has resulted in the acid solution flowing mainly into the high permeability layers, further aggravating the permeability differences, making it difficult to effectively improve the conductivity of the layers with medium and low permeability, and resulting in poor acidizing job quality. A new self-diverting acid was developed to deal with these problems. The self-diverting acid was viscosified with ZX-1, an amphoteric surfactant. Laboratory experiments have been conducted on the rheology, compatibility, gel-breaking and the diverting acid stimulation performance of the self-diverting acid. It was shown that the simulated fresh acid had viscosity of 6 mPa s, which was easy to inject into reservoir formations. The viscosified simulated self-diverting acid had viscosity
of 60 mPa + s, highly resistant to shearing. And the simulated residue acid had viscosity of only 2 mPa -
The self-diverting acid was well compatible with corosion inhibitors.
and no precipitation and residue were observed in the
easy to be flowed back
, swelling inhibitors and cleanup additives
oeriments. Gel breaking of the self-diverting acid was easy to realize with iso-
propyl alcohol, demulsifiers, ethylene glycol monobutyl ether and acid solutions
was less than 10 mPa
s. Part of the gel within thc
automatically become broken, rendering
scosity of the self-diverting acid after gel breaking
riscosified acid may not be broken at the time of application, but with time, it will
otential of reservoir. The self-diverting acid had good diverting
property, with the permeability difference ratio increased from the initial value of 2.00 to the final value of 10.70. After acid stimulation, the permeability of the low-permeability layers was enhanced remarkably, and the permeability differences between the high- and
第一作者简介：高尚，工程师，1983年生，毕业于西南石油大学油气田开发工程专业并获硕士研究生学位，现在从
事酸化压裂研究工作。电话（010）66501172；E-mail：gaoshang@cnooc.com.cn。。万方数据