阴-非体系高温泡排剂HDHP的研究及应用——以四川盆地东胜页岩气井为例

doi:10.13809/j.cnki.cn32-1825/te.2023.02.013

摘要/Abstract

摘要：

四川盆地东胜区块页岩气井储层垂深大（最大4 300 m）、地层温度高（最高140 ℃）、钙镁离子质量浓度高（最高2.8×10^-3 kg/L），导致返排液量过低，泡排剂效果不佳。针对此问题，在室内选取脂肪醇聚氧乙烯醚硫酸钠（AES）、含氟己基乙醇聚氧乙烯醚（FT）、改性硅油树脂聚醚（FM）和金属螯合剂（EDTA-2Na）为原料，制得阴-非体系高温泡排剂HDHP。通过正交试验，研究了AES、FT和FM不同配比对发泡、稳泡性能的影响，从而确定HDHP的最佳配比。通过室内实验评价HDHP的泡沫综合性能，表明高温泡排剂HDHP具有良好的抗温性和抗钙镁离子能力。在东胜区块3口井的试验过程中，平均单井产气量提高了30 %。研究结果表明，阴-非体系高温泡排剂HDHP适用于东胜区块超深页岩气井泡沫排采工艺，具有良好的应用前景。

关键词: 阴-非体系, 泡排剂, 高温, 页岩气井, 东胜区块

Abstract:

The shale gas wells in Dongsheng Block of Sichuan Basin are in deep reservoirs with the maximum depth of 4 300 m, with high stratum temperature up to 140 ℃ and of high mass concentration of calcium and magnesium ions up to 2.8×10^-3 kg/L. All these characteristics result in the low flowback fluid volume and poor effect of foaming agent. In order to solve these problems, the fatty alcohol polyoxyethylene lauryl ether sulfate sodium（AES）, fluorohexyl ethanol polyoxyethylene ether（FT）, modified silicone oil resin polyether（FM） and metal-chelator（EDTA-2Na） are adopted as the raw materials to prepare a high temperature foaming agent in anionic-nonionic system namely HDHP. According to the orthogonal experimental design, the effects of different ratio of AES, FT and FM on the foaming ability and foaming stability are studied, and the optimum addition are determined. The comprehensive performance of HDHP evaluated in the laboratory shows a good effect of temperature and calcium and magnesium ions resistance. In the test of three wells in Dongsheng Block, the average gas production per well has increased by 30 %. The results show that HDHP is suitable for the foam drainage technology of ultra-deep shale gas wells in Dongsheng Block, and has good popularization and application value.

Key words: anionic-nonionic system, foaming agent, high temperature, shale gas well, Dongsheng Block

中图分类号:

TE357

张龙胜,王维恒. 阴-非体系高温泡排剂HDHP的研究及应用——以四川盆地东胜页岩气井为例[J]. 油气藏评价与开发, 2023, 13(2): 240-246.

ZHANG Longsheng,WANG Weiheng. Study and application of a high temperature foaming agent in anionic-nonionic system namely HDHP: A case study of shale gas wells in Dongsheng Block, Sichuan Basin[J]. Reservoir Evaluation and Development, 2023, 13(2): 240-246.

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种类	优点	缺点
阴离子型（硫酸盐和磺酸盐类）	起泡能力强，来源广泛，价格适中，经济效益较高	抗电解质能力较差，易与多价阳离子生成沉淀
阳离子型（季铵盐和胺盐类）	抗盐性强，抗温性强	价格较昂贵，起泡能力一般
两性离子型（氨基酸和甜菜碱类）	抗盐性好，稳泡能力好，毒性低	价格较昂贵、受地层水条件限制较大、抗温性较差
非离子型（聚氧乙烯和聚醚类）	抗温抗盐性好，稳泡性好，配伍性好	起泡能力一般，价格较昂贵
特殊型（氟碳和有机硅类）	起泡能力较强、无毒性、抗温性好，特殊氟碳抗温能达200 ℃以上	来源有限、价格昂贵、市场产品性能良莠不齐

单剂名称	实验条件	V₀（mL）	V₅（mL）	ω（%）
LAS	常温	550	405	26.36
AOS		540	400	25.92
AES		580	429	26.03
OB-2		520	385	25.96
FT		560	423	24.46
PKO		480	340	29.16
LAS	150 ℃老化24 h	460	317	31.68
AOS		440	314	28.95
AES		550	408	25.81
OB-2		415	301	27.46
FT		510	385	24.51
PKO		430	314	27.98

序号	AES、FT、FM的质量比	V₀（mL）	V₅（mL）
1	1:1:0.05	475	329
2	1:2:0.10	485	338
3	1:3:0.15	550	405
4	1:4:0.20	525	400
5	2:1:0.10	500	350
6	2:2:0.05	550	412
7	2:3:0.20	360	188
8	2:4:0.15	335	155
9	3:1:0.15	390	220
10	3:2:0.20	540	396
11	3:3:0.05	510	355
12	3:4:0.10	375	205
13	4:1:0.20	550	405
14	4:2:0.15	530	390
15	4:3:0.10	560	410
16	4:4:0.05	550	405

加量（%）	V₀（mL）	V₅（mL）	ω（%）
0	530	400	24.53
0.05	580	465	19.83
0.10	580	465	19.83
0.15	600	505	15.83
0.20	600	505	15.83

泡排剂	条件	V₀ （mL）	V₅ （mL）	ω （%）	泡排剂	条件	V₀ （mL）	V₅ （mL）	ω （%）
HDHP	老化前	600	460	23.33	HDHP	老化后	550	404	26.55
KD01		560	421	24.82	KD01		457	257	43.76
XH02		550	403	26.73	XH02		433	234	45.96
GY03		530	407	23.21	GY03		392	208	46.94
BZ04		550	409	25.64	BZ04		414	224	45.89