Research Papers: Petroleum Engineering

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

[+] Author and Article Information
Zheng Tong

Research Institute of Petroleum Exploration and
Development (RIPED),
P.O. Box: 910, No. 20 Xueyuan Road,
Beijing 100083, China
e-mail: tongzheng1932@petrochina.com.cn

Guangmin Zhao

Oil & Gas Technology Research Institute,
MingGuang Street,
Xian 710021, Shaanxi, China
e-mail: zhgm_cq@petrochina.com.cn

Songbo Wei

Research Institute of Petroleum Exploration and
Development (RIPED),
No. 20 Xueyuan Road,
P.O. Box 910,
Beijing 10083, China
e-mail: weisongbo@petrochina.com.cn

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 14, 2017; final manuscript received November 19, 2017; published online December 22, 2017. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 140(5), 052906 (Dec 22, 2017) (11 pages) Paper No: JERT-17-1284; doi: 10.1115/1.4038623 History: Received June 14, 2017; Revised November 19, 2017

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 multipart 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 four modes: long-term down-hole monitoring, 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 °C, compressive strength of 370 MPa, and disintegrating rate of 170.9 mg/(cm2 h) characterized by lab test. Field trials were successfully performed in two liquid-loading tight gas wells, and the maximal deviated angle of the wells was 68 deg. 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.

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Fig. 1

Schematic representation of assembly: (a) flexible plunger body, (b) vortex generator, and (c) full assembly

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Fig. 2

Schematic representation of assembly: (a) DRIA, (b) sand-removing part, and (c) foamer canister

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Fig. 3

Block diagram of WMCS and plunger instrument canister

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Fig. 4

System schematic diagram: (a) canister deployed to bumper, (b) mobile data acquisition, and (c) wireless data exchange

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Fig. 5

Mechanical property test of material: (a) stress versus strain plots (test sample with D = 1 cm, H = 2 cm, 20 °C) and (b) compressive strength versus temperature plots

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Fig. 6

Disintegration test: (a) remaining mass versus time plots (4% potassium chloride solution brine, 60–100 °C) and (b) sample before and after disintegration (D = 1 cm, H = 2 cm)

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Fig. 7

Scanning electron microscope images of RDA: (a) original form and (b) disintegrating after 15 min

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Fig. 8

Prototype and lab test: (a) mechanical components and (b) lab test for wireless data exchange

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Fig. 9

Gas well for trial

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Fig. 10

Pressure and temperature data measured by canister in well A (two cycles)

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Fig. 11

Pressure build-up down-hole sampling for two positions in well C: (a) schematic diagram and (b) pressure versus time plots

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Fig. 12

Field trial: (a) liquid mixture unloaded from well A and (b) canisters retrieved to surface



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