海上油井高效经济钡锶垢除垢剂体系评价及除垢工艺研究

doi:10.3969/j.issn.1001-1803.2022.10.005

摘要/Abstract

摘要：

海上油井钡锶垢清除难度大、作业费用高,需要通过优化除垢剂配方和改进除垢工艺来降低除垢成本。针对涠洲油田群典型井下工况,采用真实垢样开展了除垢剂溶垢实验,从保持除垢效果降低药剂用量和保持药剂用量提高除垢效果两个角度,研发和改进了除垢剂配方;提出了除垢作业与修井作业二合一的工艺改进新思路,初步论证了除垢剂与修井液合二为一的可能性。结果表明,现用药剂SD-132和优选的新剂DTPA的用量降低至8%仍可满足除垢指标要求;研发的以DTPA为主剂的新剂改进配方,在相同质量分数（16%）下比现剂溶垢量可提高13.08%,现剂添加2%~4% DTPA后,溶垢量也可提高14.49%,且新配方对不同类型垢样均适用;除垢剂与修井液二合一具有一定可行性,两者复配后仍可保持良好的除垢和储保性能,若能实现修井作业同时除垢,除垢剂和施工成本将会大大降低,将大幅提高海上油井钡锶垢除垢工艺的经济性。

关键词: 硫酸钡锶垢, 除垢剂, 溶垢能力, 除垢工艺, 修井液

Abstract:

Due to the difficulty in removing BaSO₄/SrSO₄ scale from offshore oil wells and the high operating costs, it is necessary to optimize the formula of descaling agent and the descaling process to reduce the scale removal cost. A series of descaling experiments were conducted referring to the typical bottom-hole conditions of the oil wells in Weizhou Oilfield. New formulas of descaling agent were developed, and the descaling agent currently used in field was improved, from the point of view of maintaining the descaling effect to reduce the amount of descaling agent or maintaining the amount of descaling agent to improve the descaling effect. A novel concept to improve the descaling process was proposed, in which the descaling operation was combined with the workover operation, and the feasibility thereof was preliminarily assessed. The results show that, the dosage of the current agent SD-132 and the preferred new agent DTPA can be reduced to 8% and still meet the descaling index requirements. The amount of scale dissolved by the developed new formula containing DTPA can be increased by 13.08% compared with the current agent SD-132 at the same mass fraction （16%）. After adding 2%-4% DTPA to the current agent SD-132, the amount of scale dissolved can also be increased by 14.49%. The new formula is applicable to different types of scale samples. The combination of descaling agent and workover fluid has a certain feasibility. The combined fluid can still maintain good descaling and formation protection performance. If the workover can achieve descaling at the same time, the cost for descaling agent and operation will be greatly reduced. The economy of the Ba/Sr scale descaling process for offshore oil wells will be greatly improved.

Key words: BaSO₄/SrSO₄ scale, descaling agent, scale dissolving ability, descaling process, workover fluid

中图分类号:

TE423

吴绍伟,程利民,万小进,梁玉珠,张亮,康万利. 海上油井高效经济钡锶垢除垢剂体系评价及除垢工艺研究[J]. 日用化学工业（中英文）, 2022, 52(10): 1062-1071.

Wu Shaowei,Cheng Limin,Wan Xiaojin,Liang Yuzhu,Zhang Liang,Kang Wanli. Evaluation of efficient and economical Ba/Sr scale remover and descaling technology for offshore oil wells[J]. China Surfactant Detergent & Cosmetics, 2022, 52(10): 1062-1071.

图/表 19

表1

表2

表3

图1

图2

图3

图4

图5

图6

图7

图8

图9

表4

表5

图10

图11

图12

图13

图14

参考文献 23

[1]	Sun Aiping, He Jianying, Li Fei, et al. Squeeze injection system of barium strontium sulfate scale inhibitors in the south China sea west oilfield[J] Science Technology and Engineering, 2017, 17 (18): 198-202.
[2]	Mi Sicheng. Research on water injection scaling mechanism and anti-scaling and de-scaling methods in bo zhong 28-2 south oilfield[D]. Chengdu: Southwest Petroleum University, 2015.
[3]	Cheng Limin, Liang Yukai, Li Yanchuang, et al. Research and application of prevention and control technology of barium strontium sulfate downhole in western south china sea oilfield[J]. Drilling & Production Technology, 2020, 43 (1): 10-11, 61-64.
[4]	Sun He, Chen Ying, Qian Huijuan. Progress of descaling technology in the oilfield[J]. Chemical Reagents, 2012, 34 (11): 991-994.
[5]	Zhang Limei. Study on the synthesis of new ammonia carboxylic complex and its elimination of sulfate scale[D]. Chengdu: Southwest Petroleum University, 2015.
[6]	Xie Shuixiang, Zhao Lianguo, Yuan Quan, et al. Preparation and evaluation of barium/strontium scale cleaning agent ND-1[J]. Advances in Fine Petrochemicals, 2003, 4: 9-11.
[7]	Liu Hui. Mechanism and research progress of cleaning barium and strontium scale in oil and gas field[J]. Petrochemical Industry Application, 2017, 36 (6): 1-3, 8.
[8]	Yuan Jianlan. Research on high efficient barium sulfate descaling agent and its descaling mechanism[D]. Chengdu: Southwest Petroleum University, 2016.
[9]	Zheng Hua, Xu Bo, Ma Lu, et al. Preparation and evaluation of barium/ strontium scale cleaning agent in oilfield Wei-12-1[J]. Applied Chemical Industry, 2012, 41 (12): 2211-2213.
[10]	Chen Yuanmou. Research on scaling mechanism and descaling technology in Weixinan oilfield[D]. Chengdu: Southwest Petroleum University, 2015.
[11]	Wang Yuwei. Research on the technologies of removing barium/strontium sulfate scale[D]. Wuhan: Yangtze University, 2018.
[12]	Xu Bo. Study on chemical cleaning of barium and strontium sulfate scale[D]. Chengdu: Southwest Petroleum University, 2014.
[13]	Ma Wenjuan. Study on the synthesis of sulphate scale dissolving agent and the effect of scale dissolving[D]. Chengdu: Southwest Petroleum University, 2019.
[14]	Yang Jianhua, Song Hongfeng, Yang Sunan. Descaling and antiscaling technologies with chemical methods in Pucheng oilfield[J]. Cleaning World, 2017, 33 (1): 13-18, 36.
[15]	Chang Qixin, Zhang Bin, Zhou Chengyu, et al. Study of effects on barium and strontium sulfate scale removal in oilfield[J]. Advances in Fine Petrochemicals, 2008, 9 (1): 1-3, 7.
[16]	Navamani Kartic D, Aditya Narayana B Ch, Arivazhagan M. Removal of high concentration of sulfate from pigment industry effluent by chemical precipitation using barium chloride: RSM and ANN modeling approach[J]. Journal of Environmental Management, 2018, 206: 69-76. doi: S0301-4797(17)30995-7 pmid: 29059573
[17]	Bageri B S, Mahmoud M A, Shawabkeh R A, et al. Toward a complete removal of barite (barium sulfate BaSO₄) scale using chelating agents and catalysts[J]. Arabian Journal for Science and Engineering, 2017, 42: 1667-1674. doi: 10.1007/s13369-017-2417-2
[18]	Børeng R, Chen P, Hagen T, et al. Creating value with green barium sulphate scale dissolvers-development and field deployment on statfjord unit[C]// SPE International Symposium on Oilfield Scale. United Kingdom: Aberdeen, 2004.
[19]	Li Nianyin, He Dailan, Zhao Liqiang, et al. Performance evaluation of alkaline detergent for barium and strontium sulfate scale[J]. Oilfield Chemistry, 2016, 33 (3): 537-541, 546.
[20]	Shi Junhao, Ai Yong. Oilfield scaling and application of chemical descaling agents[J]. Petrochemical Industry Technology, 2020, 27 (11): 230-231.
[21]	Liu Rusi, Gai Jiechao. Discussion on descaling method in oil and gas exploitation[J]. Petrochemical Industry Application, 2018, 37 (9): 1-3, 8.
[22]	Zhang Zhiyong. Study and field test of scale formation and control in water injection wells[D]. Daqing: Northeast Petroleum University, 2012.
[23]	Tang Zewei, Zhu Fanghui, Li Mingxing, et al. Preparation and property of sulfate scale removing agent[J]. Oilfield Chemistry, 2015, 32 (4): 607-609, 627.

取样井	垢样组成	含油量/%
WZ12-1-B26	95% CaCO₃	6.54
WZ12-1-B27S1	96% BaSO₄	3.93
WZ12-1-A1	75% BaSO₄+25% SrSO₄	5.97
WZ11-1-A3	100% BaSO₄	5.24
WZ11-1N-A2	75% BaSO₄+25% SrSO₄	5.96
WZ6-10-A4H	99% BaSO₄	2.71
WZ6-10-A6H	78% CaSO₄+22%其他	7.48

离子	地层水/（mg/L）	注入水/（mg/L）
Na⁺	7 582	10 394
Ca²⁺	289	409
Mg²⁺	51	1 347
K⁺	200	417
Sr²⁺	36.22	0
Ba²⁺	83.37	0
Cl^-	12 425	19 127
SO₄^2-	10	2 848
HCO₃^-	339	149
CO₃^2-	21	0

药剂	含量/%				主要特点
药剂	140 ℃	120 ℃	100 ℃	80 ℃	主要特点
EDTMPS	25	15	10	10	用量较高,随温度增大
DTPA	20	16	10	10	用量中等,随温度增大
t132	25	25	25	20	用量高
HEDP	10	10	6	6	用量低
ATMP	6	6	6	3	用量低,随温度略升
PAPEMP	10	6	6	3	用量低,随温度增大
CA	10	10	10	10	用量中等

序号	w/%					溶垢率/（g/100 mL）	除垢率/%
序号	t132	PESA	VO-3	JFC-E	总助剂	溶垢率/（g/100 mL）	除垢率/%
1	0	0	0	0	0	1.61	64.40
2	5	0.05	0.2	0.2	5.45	1.51	59.92
3	3	0.05	0.2	0.2	3.45	1.40	55.45
4	1	0.05	0.2	0.2	1.45	1.63	64.87
5	3	0.05	1	0.2	4.25	1.20	48.19
6	3	0.05	0.2	0.05	3.3	1.73	69.28

序号	w/%					溶垢率/（g/100 mL）	除垢率/%
序号	t132	PESA	VO-3	JFC-E	总助剂	溶垢率/（g/100 mL）	除垢率/%
1	0	0	0	0	0	2.15	86.29
2	5	0.05	0.2	0.2	5.45	1.81	71.77
3	3	0.05	0.2	0.2	3.45	1.78	71.06
4	1	0.05	0.2	0.2	1.45	2.42	96.03
5	3	0.05	1	0.2	4.25	1.64	65.73
6	3	0.05	0.2	0.05	3.3	1.69	67.20