Analysis of Maximum Liquid Carrying Capacity Based on Conventional Tubing Plunger Gas Lift  

作　　者：Yanqun Yu Wenhao Xu Yahui Huangfu Jinhai Liu Bensheng Wang Kai Liu 

机构地区：[1]College of Mechanical and Electronic Engineering,China University of Petroleum(East China),Qingdao,266580,China [2]Energy Technology&Services Oil Production Services Company,CNOOC,Tianjin,300450,China

出　　处：《Energy Engineering》2024年第6期1521-1533,共13页能源工程（英文）

基　　金：the Fundamental Research Funds for the Central Universities of China(No.20CX02308A);CNOOC Project(No.ZX2022ZCCYF3835).

摘　　要：China’s unconventional gas fields have a large number of low-productivity and low-efficiency wells, many of whichare located in remote and environmentally harsh mountainous areas. To address the long-term stable productionof these gas wells, plunger-lift technology plays an important role. In order to fully understand and accurately graspthe drainage and gas production mechanisms of plunger-lift, a mechanical model of plunger-liquid column uplift inthe plunger-lift process was established, focusing on conventional plunger-lift systems and representative wellboreconfigurations in the Linxing region. The operating casing pressure of the plunger-lift process and the calculationmethod for the maximum daily fluid production rate based on the work regime with the highest fluid recovery ratewere determined. For the first time, the critical flow rate method was proposed as a constraint for the maximumliquid-carrying capacity of the plunger-lift, and liquid-carrying capacity charts for conventional plunger-lift withdifferent casing sizes were developed. The results showed that for 23/8 casing plunger-lift, with a well depth ofshallower than 808 m, the maximum drainage rate was 33 m3/d;for 27/8 casing plunger-lift, with a well depth ofshallower than 742 m, the maximum drainage rate was 50.15 m3/d;for 31/2 casing plunger-lift, with a well depthof shallower than 560 m, the maximum drainage rate was 75.14 m3/d. This research provides a foundation for thescientific selection of plunger-lift technology and serves as a decision-making reference for developing reasonableplunger-lift work regimes.

关 键 词：Unconventional well conventional tubing string plunger gas lift critical flow rate liquid carry-over chart version 

分 类 号：TE3[石油与天然气工程—油气田开发工程]