东胜气田井下真空隔热油管工艺应用效果分析

摘要/Abstract

摘要：

东胜气田采用“井下节流、低压集输”的模式生产。由于生产需要,一些气井需采用井口节流控制生产,但井口节流容易在地面生成水合物,需要在节流前提高井筒和地面流体温度。为此东胜气田在目标区块开展了井下真空隔热油管工艺试验。根据试验结果,运用Pipesim软件进行数据拟合,验证了隔热油管在气田的使用效果,并对隔热油管工艺在气田的应用情况进行了预测分析。结果显示,井下真空隔热油管能明显提高井口流体温度,保证井口管线不生成水合物,实现一定程度的节能降耗。现场数据拟合结果也证明了井下真空隔热油管传热系数明显低于普通油管。通过工艺进站情况分析,综合考虑成本及低压集输特点,认为该工艺在低压气田的应用存在一定的限制性,但是在必须采用井口节流生产的情况下可以作为气田的一项备选工艺。

关键词: 东胜气田, 井下真空隔热油管, 井筒保温, 井口节流, 进站生产预测

Abstract:

The production mode adopted by Dongsheng gas field is “downhole throttling and low pressure gathering and transportation”. In order to meet the production needs, some gas wells need wellhead throttling to control production. However, wellhead throttling is easy to generate hydrate on the ground. So it is necessary to increase the wellbore and surface fluid temperature before throttling. Therefore, downhole vacuum insulated tubing test was carried out in the target block of Dongsheng gas field. According to the test results, the data fitting was carried out by using the software—Pipesim—to verify the application effect of insulated tubing in gas field, and its application situation is predicted and analyzed. The test results showed that, the vacuum insulated tubing could obviously increase the fluid temperature of the wellhead, and prevent the hydrate formation in wellhead pipeline, so that to realize energy saving and consumption reduction to some extent. The fitting results of the field data also showed that the heat transfer coefficient of downhole vacuum insulated tubing was significantly lower than that of the common tubing. According to the application analysis, and considering the cost and the characteristics of low pressure gathering and transportation, it is concluded that there are certain limitations in the application of this technology in the low-pressure gas field. But it could be used as an alternative process of gas field if the wellhead throttling production must be adopted.

Key words: Dongsheng gas field, vacuum insulated tubing, wellbore heat preservation, wellhead throttling, prediction of production in station

中图分类号:

TE934

唐万举. 东胜气田井下真空隔热油管工艺应用效果分析[J]. 油气藏评价与开发, 2019, 9(4): 57-60.

TANG Wanju. Analysis on application effect of downhole vacuum insulated tubing in Dongsheng gas field[J]. Reservoir Evaluation and Development, 2019, 9(4): 57-60.

图/表 5

表1

表2

图1

图2

表3

参考文献 15

[1]	王理学, 刘清良 . 高真空隔热油管隔热机理及隔热结构的研究[J]. 山东理工大学学报(自然科学版), 2003,17(4):93-96.
[2]	孙成利 . 稠油深度开发配套隔热油管研制及应用[D]. 大庆:东北石油大学, 2014.
[3]	王忠华 . 隔热油管传热及影响因素研究[D]. 大庆:大庆石油学院, 2009.
[4]	刘红英, 黄善波 . 隔热油管接箍对井筒热损失的影响与修正[J]. 特种油气藏, 2009,16(5):97-100.
[5]	刘晓燕, 赵海谦, 王忠华 . 真空隔热油管接箍传热实验与模拟研究[J]. 工程热物理学报, 2009,30(11):1895-1897.
[6]	吴永宁 . 真空度对真空隔热油管隔热性能的影响[J]. 科学技术与工程, 2010,10(11):2728-2732.
[7]	徐长军 . 影响隔热油管隔热性能的因素[J]. 油气田地面工程, 2008,27(7):51.
[8]	于鹏 . 隔热油管接箍传热性能研究[D]. 大庆:东北石油大学, 2013.
[9]	王秉渊, 戚正风, 付吉如 . 油管隔热保温的探讨[J]. 石油钻采工艺, 1984,6(4):51-56.
[10]	方元 . 井温计算及隔热油管下入深度的确定[J]. 石油钻采工艺, 1986,8(6):43-50.
[11]	周舰, 王武, 谭苗 . 产水气井油管隔热保温技术研究与应用[J]. 天然气技术与经济, 2019,13(1):30-33.
[12]	郭道宏 . 油管隔热保温实验研究[J]. 石油矿场机械, 2011,40(11):26-28.
[13]	王志国, 马一太, 李东明 , 等. 注汽过程井筒传热及热损失计算方法研究[J]. 特种油气藏, 2003,10(5):38-41.
[14]	苗彦平, 范秀芹, 朱治国 , 等. 保温隔热油管在地面常温集油工艺中的研究与应用[J]. 油气田地面工程, 2019,38(4):35-39.
[15]	张建 . 稠油热采用隔热油管的发展及经济评价[J]. 石油钻采工艺, 1991,13(4):51-56.

外管外径/ mm	内管内径/ mm	接箍外径/ mm	联接螺纹	视导热系数（内管内壁350℃时）/[W·（m·℃）^-1]	常温抗拉载荷/kN	抗内压/MPa			抗外压/MPa		平直度, %	井深/ m	温度/℃		固井套管/ mm
外管外径/ mm	内管内径/ mm	接箍外径/ mm	联接螺纹	视导热系数（内管内壁350℃时）/[W·（m·℃）^-1]	常温抗拉载荷/kN	常温	注汽		常温	注汽	平直度, %	井深/ m	正常工作时	过热（3~4 h）	固井套管/ mm
88.9	50.6	108	31/2USS	0.02~0.08	432	32	20		30	28	≤0.2	≤1 500	350	380	139.7

测试日期	测试前稳定生产情况				中部流压/ MPa	中部流温/ ℃	井口流温/ ℃	无阻流量/ 10⁴m³
测试日期	油压/MPa	套压/MPa	日产气/10⁴m³	日产液/m³	中部流压/ MPa	中部流温/ ℃	井口流温/ ℃	无阻流量/ 10⁴m³
20151127	16.6	0	4.46	14.6	23.98	95.09	20.9	27.82
20161216	17.2	17.3	4	0.4	22.79	86.44	36.4	13.66
20161230	16	16.1	3.98	0	20.38	86.22	39.1	9

测深/m	环境温度/℃	总传热系数/[W·（m²·K）^-1]
0	9.34	0.567 45
100	15.83	0.567 45
500	23.72	0.567 45
1 000	34.83	0.567 45
1 500	49.70	6.809 4
2 100	64.96	6.809 4
2 200	66.95	6.809 4
2 300	68.80	6.809 4
2 400	70.65	6.809 4
2 500	72.35	6.809 4
2 600	74.32	6.809 4
2 700	76.59	6.809 4
2 800	79.28	6.809 4
2 900	81.55	6.809 4