Shale Gas Wellbore Liquid Loading Identification Based on Triangle Plate

doi:10.3969/j.issn.1006-6535.2020.04.026

Abstract

Abstract: In order to improve the productivity decline, insufficient liquid-carrying capacity, serious wellbore liquid loading, low recovery and other problems in the middle-late stage for the most gas wells in the Wellblock CN201 of shale gas field in Sichuan Basin, the actual production data were normalized and extremalized to eliminate the influence of parameter unit and magnitude order by comprehensively considering wellbore pressure, daily gas production and water-gas ratio according to the production performances. A triangle plate was given to analyze the scattered point distribution and determine the wellbore liquid loading area. Result indicates that the shale gas wellbore liquid loading zones for the Wellblock CN201 includes the wellhead pressure proportion is 42.38%～76.39%, the daily gas production proportion is 0.0～51.5% and the water-gas ratio proportion is 0.0～52.7%. Flowing pressure test indicates a accuracy of 84.3% for this triangle plate, which is highly reliable to identify shale gas wellbore liquid loading. This research could provide certain theoretical reference for determining on-site liquid discharge timing, liquid discharge process and liquid discharge performance evaluation.

Key words: shale gas, wellbore liquid loading, triangle plate, wellhead pressure, daily gas production, water-gas ratio, identification method

CLC Number:

TE375

Luo Xin, Wang Yuting, Wang Xueqiang, Zhao Guojun, Chen Man, Zeng Linjuan, Yang Hai, Yan Changhui. Shale Gas Wellbore Liquid Loading Identification Based on Triangle Plate[J]. Special Oil & Gas Reservoirs, 2020, 27(4): 168-174.

References

[1] 张大椿,刘晓,李远亮.凝析气藏井筒积液的诊断及排除方法综述[J].特种油气藏,2009,16(3):10-14.
ZHANG Dachun,LIU Xiao,LI Yuanliang.An overview of liquid diagnosis and removal methods for condensate gas reservoirs[J].Special Oil & Gas Reservoirs,2009,16(3):10-14.
[2] DOUSI N,VEEKEN C A M,CURRIE P K.Numerical and analytical modelling of the gas well liquid loading process[C].SPE95282,2005:1-10.
[3] 徐志杰.采气井底积液方法的判断与计算[J].山西建筑,2012,38(20):122-123.
XU Zhijie.On identification and calculation of accumulated liquid at gas recovery bottom[J].Shanxi Architecture,2012,38(20):122-123.
[4] CHUPIN G,HU Bin,HAUGSET T,et al.Integrated wellbore/reservoir model predicts flow transients in liquid-loaded gas wells[C].SPE110461,2007:1-12.
[5] 胡涛,郝海.气井井筒积液的判断[J].石化技术,2017,24(6):265.
HU Tao,HAO Hai.Judgment of fluid accumulation in gas wells[J].Petrochemical Technology,2017,24(6):265.
[6] 张磊,蒋朝.见水气井井筒积液判断方法[J].石化技术,2018,25(10):52.
ZHANG Lei,JIANG Chao.Judgment method of wellbore fluid accumulation in gas well with water producing[J].Petrochemical Technology,2018,25(10):52.
[7] 李晓平.浅谈判别气井井底积液的几种方法[J].钻采工艺,1992,15(2):41-44,22.
LI Xiaoping.Talking about several methods for distinguishing the bottom hole of gas well[J].Drilling & Production Technology,1992,15(2):41-44,22.
[8] 李雪琴,李海科,邓晗,等.井筒积液综合判断方法[J].中国石油和化工,2014,21(3):51-53.
LI Xueqin,LI Haike,DENG Han,et al.Comprehensive judgment method of wellbore liquid accumulation[J].China Petroleum and Chemical Industry,2014,21(3):51-53.
[9] 邵乐,白清,王凯.低产低压气井井底积液诊断及预测[J].机械研究与应用,2014,27(6):166-167.
SHAO Le,BAI Qing,WANG Kai.Diagnosis and prediction on downhole effusion in low-production and pressure gas wells[J].Mechanical Research & Application,2014,27(6):166-167.
[10] 李长书.智能柱塞气举采油工艺在塔河油田的应用[J].石油钻探技术,2002,30(3):55-57.
LI Changshu.Application of gas lift production with intelligent plug technology in Tahe Oilfield[J].Petroleum Drilling Techniques,2002,30(3):55-57.
[11] GUO B,GHALAMBOR A,XU C.A systematic approach to predicting liquid loading in gas wells[C].SPE94081,2005:17-19.
[12] 赵先进,姜青梅.用动能因子确定产水气井合理工作制度[J].断块油气田,1996,3(4):64-67.
ZHAO Xianjin,JIANG Qingmei.Determining reasonable working rules for water production gas wells with the kinetic energy factor[J].Fault-Block Oil & Gas Field,1996,3(4):64-67.
[13] 刘双全,吴晓东,吴革生,等.气井井筒携液临界流速和流量的动态分布研究[J].天然气工业,2007,27(2):104-106.
LIU Shuangquan,WU Xiaodong,WU Gesheng,et al. A study on dynamic distribution of the liquid-carrying critical velocities and flow rates along the wellbore of gas wells[J].Natural Gas Industry,2007,27(2):104-106.
[14] TURNER R G,HUBBARD M G,DUKLER A E.Analysis and prediction of minimum flow rate for the continuous removal of liquids from gas wells[J].Journal of Petroleum Technology,1969,21(9):1475-1481.
[15] 李闽,郭平,谭光天.气井携液新观点[J].石油勘探与开发,2001,28(5):105-106.
LI Min,GUO Ping,Tan Guangtian. New look on removing liquids from gas wells[J].Petroleum Exploration and Development,2001,28(5):105-106.
[16] 李闽,孙雷.一个新的气井连续排液模型[J].天然气工业,2001,21(5):61-63.
LI Min,SUN Lei.A new gas well continuous drainage model[J].Natural Gas Industry,2001,21(5):61-63.
[17] 李闽,郭平,刘武,等.气井连续携液模型比较研究[J].断块油气田,2002,9(6):39-41.
LI Min,GUO Ping,LIU Wu,et al. Comparative study of two models for continuous removal of liquids from gas wells[J].Fault-Block Oil & Gas Field,2002,9(6):39-41.
[18] 商绍芬,严鸿,吴建,等.四川盆地长宁页岩气井生产特征及开采方式[J].天然气勘探与开发,2018,41(4):69-75.
SHANG Shaofen,YAN Hong,WU Jian,et al.Production characteristics and development modes of shale-gas wells,Changning Gasfield,Sichuan Basin[J].Natural Gas Exploration and Development,2018,41(4): 69-75.
[19] 马镐.气井井底积液特征分析[J].辽宁化工,2012,41(10):1050-1051.
MA Hao. Characteristic analysis of gas well bottom effusion[J].Liaoning Chemical Industry,2012,41(10):1050-1051.
[20] 狄敏燕,陈超峰,王东林,等.气井井筒积液分析及排水工艺研究[J].石油钻探技术,2010,38(6):109-112.
DI Minyan,CHEN Chaofeng,WANG Donglin,et al. Analysis of wellbore fluid accumulation and water drainage technology[J].Petroleum Drilling Techniques,2010,38(6):109-112.