预分散速溶胍胶PGW的研制及应用

doi:10.13809/j.cnki.cn32-1825/te.2021.03.020

摘要/Abstract

摘要：

为了缩短压裂时间,减少压裂成本,实现连续压裂作业,在室内通过对分散体系、表面活性剂等材料的优选,研制出一种能满足现场连续压裂的预分散速溶胍胶（PGW）。通过浓缩比、水化溶胀时间、交联性能、破胶性能、抗温抗剪切性能等实验,对其综合性能进行了评价。实验结果表明,产品浓缩比（胍胶干粉质量百分比）能达50 %以上,30 d无明显分层,水化5 min后黏度能达到体系使用要求,同时具有良好的交联性能和抗温抗剪切性能。在涪陵页岩气田平桥南区块页岩气水平井成功进行了12口井压裂试验,其性能满足现场压裂施工的需求并实现了连续压裂,且压裂液胶液价格降低了32.7 %,实现了降本增效的目的。

关键词: 预分散, 速溶胍胶, 研制, 连续压裂, 应用

Abstract:

In order to save the fracturing time and cost, and realize consecutive fracturing, a kind of predispersed instant guar gum（PGW）, which can be used for successive fracturing, has been developed by the optimization of dispersion system, surfactant and other materials. The comprehensive properties have been evaluated by the experiment of concentration ratio, dissolved time, crosslinking performance, gel breaking performance, heat and shear resistance, etc. The experiment results indicate that the concentration ratio of guanidine gum powder can be more than 50 %, there is no obvious stratification in 30 days, the viscosity can meet the requirements of the system after hydration for 5 minutes and the product has good performance of cross-linking, heat resistance and shear resistance. The fracturing tests of twelve horizontal shale gas wells have been successfully carried out in south Pingqiao block of Fuling Shale Gas Field. The product performance can meet the requirements of field fracturing and realize the successive fracturing, and the price of fracturing fluid has been reduced by 32.7 %, and the purpose of cost reduction and efficiency increase has been realized.

Key words: Key Words: predispersed, instant guar gum, development, continuous fracturing, application

中图分类号:

TE357

高咏梅,王维恒,夏巍巍,刘浩,张斌. 预分散速溶胍胶PGW的研制及应用[J]. 油气藏评价与开发, 2021, 11(3): 437-442.

GAO Yongmei,WANG Weiheng,XIA Weiwei,LIU Hao,ZHANG Bin. Development and application of predispersed instant guar gum[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(3): 437-442.

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表面活性剂配方	HLB值	上层液体析出率（%）
表面活性剂配方	HLB值	1 d	7 d	30 d
Twen-80	15.000	1	3	7
Span-80	4.500	12	30	40
Span-80+Twen-80（1∶1）	9.750	10	26	35
Span-80+Twen-80（1∶2）	11.500	8	20	32
Span-80+Twen-80（1∶3）	12.375	5	12	20

序号	加料顺序	现象
1	白油→异构烷烃→ Twen-80→胍胶干粉	分散体系混合均匀,加入45 %胍胶干粉之前黏度变化不明显,继续添加至50 %左右黏度缓慢增加,可操控性较强
2	白油→Twen-80→ 异构烷烃→胍胶干粉	白油与Twen-80形成油状混合物,再加入异构烷烃后体系混合均匀但有油珠悬浮,胍胶干粉加量到30 %左右黏度剧增,迅速板结,无法继续添加
3	白油→异构烷烃→ 胍胶干粉→Twen-80	分散体系混合均匀,胍胶干粉加量到30 %左右黏度剧增,有明显的团聚物但未板结,无法继续添加
4	异构烷烃→Twen-80→ 白油→胍胶干粉	异构烷烃与Twen-80混合均匀,再加入白油后体系出现细小油珠悬浮物,静置一段时间油珠团聚变大,胍胶干粉加量到30 %左右黏度剧增,迅速板结,无法继续添加

体系配方	破胶温度（℃）	破胶时间（h）	破胶残液黏度（mPa·s）	残渣含量（mg/L）
0.6 %PGW+0.3 %JL-1 +0.02 %PJ-1	80	6	6	240
0.6 %PGW+0.3 %JL-1 +0.02 %PJ-1	80	12	3	360
0.3 %胍胶干粉+0.3 %JL-1+0.02 %PJ-1	80	6	18	190
0.3 %胍胶干粉+0.3 %JL-1+0.02 %PJ-1	80	12	6	210

胶液体系	当量价格（元/m³）	平均压裂周期（段/d）
传统胍胶干粉压裂液	220	2
速溶胍胶PGW压裂液	148	3~4