一种低渗储层凝析气藏气井产能评价方法研究

doi:10.13809/j.cnki.cn32-1825/te.2021.05.009

摘要/Abstract

摘要：

采用常规二项式产能方程对渤海某高含凝析油的低渗厚层凝析气藏气井进行产能分析,得到负的产能方程系数B,校正压力后产能方程系数B仍为负,因此,该产能方程不能用于气井产能分析。为得到气井合理产能方程,首先采用高速非达西渗流判定准则和产能方程系数B理论计算,证实本气井高速非达西可忽略不计,且地层压力和井底流压也需校正;然后基于不存在高速非达西的产能方程进行回归,得到了修正的产能方程;最后采用指数式产能方程进行验证,由其计算的无阻流量（Q_AOF）与修正产能方程计算的Q_AOF基本一致。将该方法应用在实际低渗凝析气田气井,能得到合理的气井产能方程,表明了修正产能方程的有效性。

关键词: 低渗, 凝析气藏, 校正, 高速非达西, 产能方程

Abstract:

When the conventional binomial productivity equation is used to analyze the deliverability of the gas wells in a low permeability thick layer condensate gas reservoir with high condensate content in Bohai Sea, the negative deliverability equation coefficient B can be obtained, which is still negative after pressure correction. Therefore, this equation is not suitable for the gas well productivity analysis. In order to obtain the reasonable productivity equation of the gas well, the following measures are taken. Firstly, the judgment criterion of high-speed non Darcy seepage and the theoretical calculation of productivity equation coefficient B are used to confirm that the high-speed non Darcy of the gas well is negligible, and the formation pressure and bottom hole flow pressure also need to be corrected. Then, the modified productivity equation is obtained without high-speed non Darcy productivity equation. Finally, the exponential productivity equation is used for verification, and the calculated Q_AOF（open flow, the same below） is basically consistent with the Q_AOF the modified productivity equation. When this new method is applied to the actual gas wells in low permeability condensate gas fields, a reasonable gas well productivity equation can be obtained, which shows the effectiveness of the modified productivity equation.

Key words: low permeability, condensate gas reservoir, correction, high speed non-Darcy, deliverability equation

中图分类号:

TE37

谭先红,梁斌,王帅,田波,彭世强,李南,夏阳. 一种低渗储层凝析气藏气井产能评价方法研究[J]. 油气藏评价与开发, 2021, 11(5): 724-729.

TAN Xianhong,LIANG Bin,WANG Shuai,TIAN Bo,PENG Shiqiang,LI Nan,XIA Yang. A productivity evaluation method of gas wells in condensate gas reservoirs with low permeability[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(5): 724-729.

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参考文献 20

[1]	黄全华, 王富平, 尹琅, 等. 低渗气藏气井产能与动态储量计算方法[M]. 北京: 石油工程出版社, 2011.
	HUANG Quanhua, WANG Fuping, YIN Lang, et al. Calculation method of gas well productivity and dynamic reserves in low permeability gas reservoir[M]. Beijing: Petroleum Engineering Press, 2011.
[2]	黄全华, 孙雷, 李士伦, 等. 低渗凝析气藏气井产能的正确预测[J]. 天然气工业, 2005, 25(11):82-84.
	HUANG Quanhua, SUN Lei, LI Shilun, et al. Correct prediction of gas well productivity for condensate gas reservoir with low permeability[J]. Natural Gas Industry, 2005, 25(11):82-84.
[3]	李允, 李治平, 张百灵. 气井及凝析气井产能试井与产能评价[M]. 北京: 石油工程出版社, 2002.
	LI Yun, LI Zhiping, ZHANG Bailing. Production test and productivity evaluation of gas well and condensate gas well[M]. Beijing: Petroleum Engineering Press, 2002.
[4]	苟宏刚, 赵继承, 秦志保, 等. 二项式产能方程系数异常情况(B小于零)分析[J]. 新疆石油地质, 2016, 27(2):210-212.
	GOU Honggang, ZHAO Jicheng, QIN Zhibao, et al. Analysis of abnormal binomial coefficient (B<0) for binomial deliver ability equation[J]. Xingjiang Petroleum Geology, 2016, 27(2):210-212.
[5]	姜梅枝. 气井二项式产能方程曲线斜率为负值原因分析及方程修正[J]. 油气井测试, 2013, 22(2):25-31.
	JIANG Meizhi. Binomial productivity equation slope of the curve for the analysis of the negative reasons and equation correction in gas well[J]. Oil and Gas Well Test, 2013, 22(2):25-31.
[6]	刘艳梅. 气井二项式产能曲线反向修正方法[J]. 油气井测试, 2011, 20(6):17-19.
	LIU Yanmei. Method of reverse correction for binomial production curve of gas well[J]. Oil and Gas Well Test, 2011, 20(6):17-19.
[7]	高创波, 单永乐, 吴胜利, 等. 涩北气田产能试井二项式方程曲线倒转校正方法[J]. 油气井测试, 2014, 23(6):12-14.
	GAO Chuangbo, SHAN Yongle, WU Shengli, et al. Inverted correction method with productivity test binomial equation curve in Sebei Gas Field[J]. Oil and Gas Well Test, 2014, 23(6):12-14.
[8]	余元洲, 张彩, 杨丽容, 等. 不同压力下确定凝析气井二项式产能方程的一种新方法[J]. 天然气工业, 2006, 26(3):84-86.
	YU Yuanzhou, ZHANG Cai, YANG Lirong, et al. A new approach of establishing binomial deliverability equation of gas condensate well at different pressures[J]. Natural Gas Industry, 2006, 26(3):84-86.
[9]	朱绍鹏, 李文红, 劳业春. 反凝析对凝析气井产能的影响研究[J]. 海洋石油, 2007, 27(2):88-91.
	ZHU Shaopeng, LI Wenhong, LAO Yechun. The influence of retrograde condensate on productivity of condensate gas well[J]. Offshore Petroleum, 2007, 27(2):88-91.
[10]	张风波, 马帅, 张芨强, 等. 广义二项式产能方程的推导与应用[J]. 岩性油气藏, 2017, 29(6):87-91.
	ZHANG Fengbo, MA Shuai, Zhang Jiqiang, et al. Derivation and application of generalized binomial productivity equation[J]. China Offshore Oil and Gas, 2017, 29(6):87-91.
[11]	潘昭才, 孙雷, 阳广龙, 等. 气井二项式与指数式产能方程偏差分析[J]. 油气井测试, 2007, 16(4):8-9.
	PAN Zhaocai, SUN lei, YANG Guanglong, et al. Variance analyzing of binomial and exponential deliverability equation in gas well[J]. Oil and Gas Well Test, 2007, 16(4):8-9.
[12]	潘昭才, 阳广龙, 孙红海, 等. 确定气井二项式产能系数的新方法[J]. 西南石油学院学报, 2006, 28(6):40-41.
	PAN Zhaocai, YANG Guanglong, SUN Honghai, et al. A new method of computing the binomial deliverability coefficient of gas well[J]. Journal of Southwest Petroleum Institute, 2006, 28(6):40-41.
[13]	田婉玲, 齐二波, 吴茂富, 等. 气井试井产能分析新方法与新模型应用[J]. 天然气与石油, 2012, 30(4):46-49.
	TIAN Wanling, QI Erbo, WU Maofu, et al. Application of new method and new model of gas well test capacity[J]. Natural Gas and Oil, 2012, 30(4):46-49.
[14]	刘立明, 景向伟, 李勇泳, 等. 凝析气藏产能方程异常分析[J]. 石油勘探与开发, 2004, 31(5):99-101.
	LIU Liming, JING Xiangwei, LI Yongyong, et al. Abnormal productivity equation of condensate reservoir[J]. Petroleum Exploration and Development, 2004, 31(5):99-101.
[15]	WANG T C, GHALIH M. Evaluation of grey forecasting method in total Indonesian production crude oil and condensate[C]// 2017 4th international conference on advanced education technology and management science(AETMS 2017), September 17, 2017, Shenzhen, China.
[16]	KANG X D, LI X F, LIU Y J, et al. The influence of high-velocity flow on well productivity in gas condensate reservoirs[C]// Advances in Multiphase Flows vol.2: Multiphase, Non-Newtonian and Reacting Flows(Department of Petroleum Engineering, University of Petroleum), September 10-12, 2004, Hangzhou, China.
[17]	PANG J, LIU H, YU X N. The new methods for non-steady productivity prediction of condensate gas reservoir and the application evaluation[J]. Applied Mechanics and Materials, 2012, 2049:401-404.
[18]	张安刚, 范子菲, 宋珩. 一种新的凝析气藏无因次产能评价方程[J]. 地球科学—中国地质大学学报, 2004, 39(10):1491-1496.
	ZHANG Angang, FAN Zifei, SONG Heng. A new dimensionless deliverability equation of gas condensate reservoir[J]. Earth Science-Journal of China University of Geosciences, 2014, 39(10):1491-1496.
[19]	李治平. 油气层渗流力学基础[M]. 北京: 石油工程出版社, 2001.
	LI Zhiping. Foundation of percolation mechanics in oil and gas reservoir[M]. Beijing: Petroleum Engineering Press, 2001.
[20]	李士伦, 孙雷, 郭平, 等. 天然气工程[M]. 北京: 石油工程出版社, 2000.
	LI Shilun, SUN Lei, GUO Ping, et al. Natural gas engineering[M]. Beijing: Petroleum Engineering Press, 2000.

测试号	厚度（m）	油嘴（mm）	产量（m³/d）		压力（MPa）
测试号	厚度（m）	油嘴（mm）	油	气	井底流压	地层压力	生产压差
1	66	6.35	85.86	117 800	40.01	45.9	5.88
		7.94	127.98	168 100	36.91		8.99
		9.53	155.34	218 000	33.92		11.98
		11.11	191.22	271 700	31.43		14.47

油嘴（mm）	产量（m³/d）		压力（MPa）
油嘴（mm）	油	气	井底流压	校正流压	反凝析压降
6.35	85.86	117 800	40.01	40.12	0.11
7.94	127.98	168 100	36.91	37.03	0.12
9.53	155.34	218 000	33.92	34.05	0.13
11.11	191.22	271 700	31.43	31.57	0.14

油嘴（mm）	时间（h）	产量（m³/d）		压力（MPa）
油嘴（mm）	时间（h）	油	气	井底流压	校正流压	反凝析压降
6.11	14	111.47	100 000	38.46	38.85	0.39
8.61	13	185.24	150 000	37.51	37.92	0.41
10.28	16	213.13	200 000	36.41	36.83	0.42
12.38	23	272.84	250 000	34.41	34.85	0.43
14.29	26	294.22	300 000	33.36	33.82	0.46