Experimental selection of low-temperature gel breaker for HPG fracturing fluid in CBM wells

被引：0
|
作者：
Ni X.-M. [1 ,2 ]
Yu Y.-Y. [1 ]
He J.-Z. [3 ]
机构：
[1] School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo
[2] Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo, 454000, Henan Province
[3] New Project Department of CBM Exploration and Development Division, Huabei Oilfield, Linfen
来源：
Meitan Xuebao/Journal of the China Coal Society | 2016年 / 41卷 / 05期
关键词：
Coal core damaging; Compound acid; Fracturing fluid; Hydroxyropyl-guar gum; Low-temperature gel breaker;
D O I：
10.13225/j.cnki.jccs.2015.1031
中图分类号：
学科分类号：
摘要：
Gel breaking experiments about four different acid solutions were conducted, the fracturing fluid viscosity, residue particle size distribution, residua content and sugar content in the gel breaking liquid were separately tested by rotational viscometer, Malvern laser particle size analyzer, centrifuge and spectrophotometer, and the breaker for the low temperature coal reservoir was optimized. The damage ratio of gel breaking liquid to the coal reservoir was evaluated by experimental tests. The results show that: Hydroxyropyl-guar gum fracturing fluids could be broken quickly and completely at the temperature 20 degrees by using the HXM+NH4Cl, the greater the concentration, the faster the gel breaking speed; When the concentration is 0.10% HXM+0.05%NH4Cl, the fracturing fluid viscosity can drop less than 5 mPa·s within 2 hours, the residue particle size is 86 μm, residue content is 70 mg/L. The damage ratios of permeability by coal samples are lower than 20% when the original permeability is less than 0.87×10-15 m2. Furthermore, the higher the original reservoirs permeability, the greater the damage ratio is. Compared with the oxide breaker, the advantages of the composite acid breaker are quite torn glue at low temperature, little residual content and the minor injury. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：1173 / 1179
页数：6
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