气田管输带压条件下天然气水露点测定及应用——子洲气田集气站为例

油气藏评价与开发 ›› 2018, Vol. 8 ›› Issue (1): 49-53.

气田管输带压条件下天然气水露点测定及应用——子洲气田集气站为例

张益¹,沈磊²,田喜军³,胡均志³,刘鹏³

^1. 西安石油大学石油工程学院,陕西西安 710065
^2. 中国石油长庆油田分公司油气工艺技术研究院,陕西西安 710079
^3. 中国石油长庆油田分公司第二采气厂,陕西西安 710200

收稿日期:2017-03-15 出版日期:2018-02-26 发布日期:2018-12-05
作者简介:张益（1979—）,男,博士、副教授、硕士生导师,油气藏渗流理论与数值模拟技术、油气田开发理论与方法研究。
基金资助:
国家自然科学基金资助项目“基于采动影响条件下煤层气数值模拟方法研究”(51404196)

Determination and application of water dew point of natural gas in gas field with pressure pipeline: A case study in gas gathering station of Zizhou gas field

Zhang Yi¹,Shen Lei²,Tian Xijun³,Hu Junzhi³,Liu Peng³

^1. College of Petroleum Engineering, Xi’an Shiyou University, Xi’an, Shaanxi 710065, China;
^2. Oil and Gas Production Technology Research Institute of PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710079, China;
^3. NO.2 Gas Production Plant of PetroChina Changqing Oilfield Company, Xi’an, Shaanxi 710200, China;

Received:2017-03-15 Online:2018-02-26 Published:2018-12-05

摘要/Abstract

摘要：

天然气从井口到处理厂的流动过程中,由于流程中温度和压力等不断变化,可能出现部分凝析水,造成输送效率下降。子洲气田集气站采用“小站常温分离、湿气气相输送、处理厂集中脱烃脱水”的工艺模式,其中常温分离的方法,需要通过水露点的研究确定凝析水产生的部位,明确不同工况下合理的集气站运行温度,提高集气站分离效率。利用自研的水露点测试仪对子洲气田（洲1、洲4、洲8）集气站外输部分取天然气进行不同压力下水露点测试,建立了水露点—压力的指数预测模型,进而建立了水露点与含水量的关系方程。子洲气田洲4站数据计算表明,该站夏季凝析水主要出现在外输到接收站的管道中,日产凝析水量约8 m ³,冬季时站内就出现了凝析水,从外输端到接收站的凝析水量少于夏季,但外输到接收站的管道中仍有一定量的凝析水出现,矿场外输压降和清出积液量随日期变化曲线说明了该次计算结果是比较可靠的。根据该次带压条件下水露点预测可计算的集气站管线日产水量,为现场措施清管提供有力指导,减少了管线运行阻力。

关键词: 子洲气田, 天然气水露点, 凝析水, 含水量

Abstract:

In the process of the natural gas flowing from the well head to the treatment plant, some condensate water may be produced and the transport efficiency declines due to the constant changes of the temperature and the pressure. The gathering stations of the Zizhou gas field adopt the technological process of the single station with the separated water and gas at the room temperature, the moisture vapor transport, and the hydrocarbon and dehydration took off together in the treatment plant. The separation of the water and gas at the room temperature need to determine where the condensate is by analyzing the water dew point, and ensure the reasonable running temperature under the different working conditions, so as to improve the separation efficiency of the gas station. By thewater dew point tester developed independently, the water dew point test was carried out under different pressure of the natural gas from the gas gathering stations in Zizhou gas field, that is, Zhou-1 station, Zhou-4 station and Zhou-8 station, and the index prediction model of the water dew point and pressure was established, and then, the equation of the water dew point and water content was established. The calculation results of Zhou-4 station show that the condensate water of this station mainly appears in the pipelines which connect the outside to the inside of the station in summer. The daily production of the condensate water is about 8 m ³. While in winter, the condensate water appears within the gas gathering stations and the amount of which appears in the pipelines is less than that in summer, but still exists. The pressure drop and the discharge volume changed with the date show that this calculation is more reliable. The daily water production of the gathering station by the water dew point under the pressure provide the effective measures for the pigging in field and reduce the running resistance of the pipeline.

Key words: Zizhou gas field, water dew point of natural gas, condensate water, water content

中图分类号:

TE832

张益,沈磊,田喜军,胡均志,刘鹏. 气田管输带压条件下天然气水露点测定及应用——子洲气田集气站为例[J]. 油气藏评价与开发, 2018, 8(1): 49-53.

Zhang Yi,Shen Lei,Tian Xijun,Hu Junzhi,Liu Peng. Determination and application of water dew point of natural gas in gas field with pressure pipeline: A case study in gas gathering station of Zizhou gas field[J]. Reservoir Evaluation and Development, 2018, 8(1): 49-53.

图/表 5

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序号	名称	原理	降温最大值	测试方法
1	冷却镜面凝析湿度计法	通过检测湿度计冷却镜面上的水蒸气凝析物或检查镜面上凝析物的稳定性来测定水露点	-70 ~ 100 ℃左右（依据不同介质有所不同）	手动,自动
2	电解法	气体以一定的恒速通过特殊结构的电解池时,其中水分被五氧化二磷电解分为氢气与氧气	30 ℃左右（采用乙烯氧化物） 20 ℃左右（采用丙酮）	手动
3	电容法	根据电容的变化换算得到水露点	40 ℃左右（采用压缩CO₂等）	手动
4	电压法	当气体流经压电屏体时,吸湿涂层可吸收气流中的水分引起涂层质量发生变化,共振器的振动频率发生改变。通过频率的改变计算水露点	降到-70~-80℃（采用液氮）	手动,自动

压力/MPa	推算水露点/℃	测量水露点/℃	推算与测量水露点偏差值,%
0.101 325	-17.310	-17	1.82
0.3	-8.321	-9.2	-9.55
0.5	-4.142	-4.2	-1.38
0.7	-1.388	-1.5	-7.47
1	1.530	1.53	0.00
1.2	3.022	3.2	-5.56
1.5	4.848	5.1	-4.94
2	7.202	7.9	-8.84
3	10.519	11.2	-6.08
5.2	15.020	14.5	3.59
5.26	15.114	14.9	1.44
5.54	15.538	15.2	2.22

露点/℃	含水量/10^-6	露点/℃	含水量/10^-6	露点/℃	含水量/10^-6	露点/℃	含水量/10^-6
-30	375.3	-15	1 632	1	6 486.84	16	17 934.21
-29	416.2	-14	1 788	2	6 960.53	17	19 105.26
-28	461.3	-13	1 959	3	7 486.84	18	20 368.42
-27	510.8	-12	2 145	4	8 026.32	19	21 684.21
-26	565.1	-11	2 346	5	8 605.26	20	23 078.95
-25	624.9	-10	2 566	6	9 223.68	21	24 539.47
-24	690.1	-9	2 803	7	9 881.58	22	26 092.11
-23	761.7	-8	3 059	8	10 592.11	23	27 723.68
-22	840	-7	3 338	9	11 328.95	24	29 447.37
-21	925.7	-6	3 639	10	12 118.42	25	31 263.16
-20	1 019	-5	3 966	11	12 947.37	26	33 171.05
-19	1 121	-4	4 317	12	13 842.11	27	35 184.21
-18	1 233	-3	4 699	13	14 776.32	28	37 302.63
-17	1 355	-2	5 109	14	15 776.32	29	39 526.32
-16	1 487	-1	5 553	15	16 828.95	30	41 868.42