Special Oil & Gas Reservoirs >

2025 , Vol. 32 >Issue 4: 136 - 142

DOI: https://doi.org/10.3969/j.issn.1006-6535.2025.04.016

Drilling & Production Engineering

Synthesis and performance evaluation of a temperature-responsive self-defoaming intelligent gas drainage foaming agent for gas wells

  • DU Jing ,
  • CHEN Jun ,
  • MAO Yukun ,
  • XU Zhiyu ,
  • LIAO Li ,
  • YE Kejie ,
  • LI Gang ,
  • HOU Baofeng
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  • 1. PetroChina Qinghai Oilfield Company, Oil and Gas Process Research Institute, Dunhuang, Gansu 736202, China;
    2. PetroChina Qinghai Oilfield Company, No.1 Gas Production Plant, Golmud, Qinghai 816000, China;
    3. Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Yangtze University, Wuhan, Hubei 430100, China

Received date: 2024-06-02

  Revised date: 2025-05-15

  Online published: 2025-09-03

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Abstract

To solve the problems of excessive consumption of foaming agents and defoaming agents, incomplete defoaming, and complex processes in liquid drainage gas production technology, a gas well temperature-responsive self-defoaming intelligent gas drainage foaming agent TS-1 was developed, and its performance was evaluated. The study shows that the foaming agent has good foaming performance and stability at a temperature of 80 ℃ and a salinity of 20×104 mg/L; a 0.2% foaming agent solution can undergo a phase transition by itself around 20 ℃, changing from foamability to defoamability, with a foam volume reaching 420 mL and a foam half-life reaching 13 minutes; formation sand has little effect on the foaming ability of the foaming agent solution, with a liquid-carrying rate of 84.8%. After 20 minutes, the self-defoaming rate reached 84.3%; after adding the synergistic agent ESAB, the self-defoaming rate approached 100%, and the self-defoaming ability was enhanced; at the wellhead position and in surface pipelines, the self-defoaming intelligent foaming agent for gas wells can rapidly self-defoam under the influence of ambient temperature, avoiding the step of adding defoaming agents, simplifying the operation process, and effectively improving the efficiency of foam drainage operations. After the successful application of the self-defoaming intelligent foaming agent, the average daily gas production increase was 4 000 m3, and the average daily liquid discharge increase was 2.8 m3, showing significant gas increase and liquid discharge effects. This achievement provides a new technical approach for gas well liquid drainage gas production and has important field application value.

Key words： gas drainage foaming agent; temperature-sensitive; liquid drainage gas production; self-defoaming; gas well

Cite this article

DU Jing , CHEN Jun , MAO Yukun , XU Zhiyu , LIAO Li , YE Kejie , LI Gang , HOU Baofeng . Synthesis and performance evaluation of a temperature-responsive self-defoaming intelligent gas drainage foaming agent for gas wells[J]. Special Oil & Gas Reservoirs, 2025 , 32(4) : 136 -142 . DOI: 10.3969/j.issn.1006-6535.2025.04.016

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