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research-article

A Novel Intermittent Gas Lifting and Monitoring System towards Liquid Unloading for Deviated Wells in Mature Gas Field

[+] Author and Article Information
Zheng Tong

Master degree, P.R. China, Research Institute of Petroleum Exploration and Development (RIPED), PetroChina, P. O. Box910, No.20 Xueyuan Road, Beijing, P.R.China, 100083
tongzheng1932@petrochina.com.cn

Guangmin Zhao

Master degree, P.R. China, ChangQing Oilfield Company, PetroChina
zhgm_cq@petrochina.com.cn

Songbo Wei

Ph.D, P.R. China, Research Institute of Petroleum Exploration and Development (RIPED), PetroChina
weisongbo@petrochina.com.cn

1Corresponding author.

ASME doi:10.1115/1.4038623 History: Received June 14, 2017; Revised November 19, 2017

Abstract

For liquid-loading gas wells, effective deliquification operation is needed but current liquid-lifting technology is not able to meet the requirements of high efficiency as well as low cost especially in large-deviated wells. This paper proposes a hybrid deliquification technology combining plunger lift, chemical foamer injection and down-hole monitoring to unload liquid in deviated gas wells. The system comprised multi-part plunger body, deployment-retrieving integrating assembly (DRIA) and operation canisters. By means of flexible plunger body, the system performs deliquification normally in deviated wellbore. The operation canisters are carried with plunger body through tubing onto the bottom of deviated section to operate in terms of 4 modes: long-term down-hole mornitoring, foamer injection, mobile data acquisition and wireless data exchange with the wellhead. The key components of DRIA and injection valve are made of improved disintegrating alloy with the rating temperature of 100?, compressive strength of 370MPa and disintegrating rate of 170.9mg/(cm2hr) characterized by lab test. Field trials were successfully performed in 2 liquid-loading tight gas wells and the maximal deviated angle of the wells was 68º. It indicates that the new technology is a cost-effective way contributing to automatic production and management of mature gas wells in the remote area instead of traditional rigid plunger and wire-line logging.

Copyright (c) 2017 by ASME
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