Journal of
Petroleum and Gas Engineering

  • Abbreviation: J. Petroleum Gas Eng.
  • Language: English
  • ISSN: 2141-2677
  • DOI: 10.5897/JPGE
  • Start Year: 2010
  • Published Articles: 93

Full Length Research Paper

Dynamic simulation of the unloading process of gas-lift hard lifts in the Kelameili Water-Flooded Gas Well

Zhong Haiquan
  • Zhong Haiquan
  • State Key Laboratory of Oil/Gas Reservoir Geology and Exploitation, Southwest Petroleum University, China.
  • Google Scholar
Zhang Feng
  • Zhang Feng
  • No.1 Gas Recovery Plant, Xinjiang Oilfield Company, CNPC, Xinjiang Karamay, China.
  • Google Scholar
Feng Dianfang
  • Feng Dianfang
  • No.1 Gas Recovery Plant, Xinjiang Oilfield Company, CNPC, Xinjiang Karamay, China.
  • Google Scholar
Wang Xiaolei
  • Wang Xiaolei
  • No.1 Gas Recovery Plant, Xinjiang Oilfield Company, CNPC, Xinjiang Karamay, China.
  • Google Scholar
Wang Zhengming
  • Wang Zhengming
  • No.1 Gas Recovery Plant, Xinjiang Oilfield Company, CNPC, Xinjiang Karamay, China.
  • Google Scholar
Hong Jiangling
  • Hong Jiangling
  • No.1 Gas Recovery Plant, Xinjiang Oilfield Company, CNPC, Xinjiang Karamay, China.
  • Google Scholar
Chen Wei
  • Chen Wei
  • No.1 Gas Recovery Plant, Xinjiang Oilfield Company, CNPC, Xinjiang Karamay, China.
  • Google Scholar


  •  Received: 01 July 2017
  •  Accepted: 20 October 2017
  •  Published: 30 November 2017

Abstract

Owing to its strong adaptability and flexibility, gas lift is widely used in deliquification or production restoration for water-flooded gas well. This paper briefly introduced the advantages and adaptability of the gas-lift hard lift technology (gas lift without gas lift valve). The mathematical model based on the mass and momentum conservation was established to describe the unloading process of gas-lift hard lift and the finite difference method used to solve the model. Taking the DX180X water-flooded gas well in Kelameili Gas Field (located in Karamay City, Xinjiang, China) as example, the unloading process of gas lift hard lift was simulated. The influence factors, including the gas source of nitrogen gas or natural gas, the lifting channel of tubing lifting or annulus lifting, the kick-off pressure and operating injection pressure, were analyzed. The changes of the wellhead pressure and the bottomhole pressure during the unloading period were simulated. The results indicate that to reduce the kick-off pressure and liquid reflux, it is recommended that annulus lifting with nitrogen gas should be chosen. This study provides the technological guidance and method for the adaptable evaluation, the process design and the compressor selection for gas-lift hard lift.

Key words: Water-flooding well, gas lift, gas-lift hard lift technology, unloading process, mathematical model.