Developing scale removing and inhibiting agent for the Lower Paleozoic sour gas wells, Daniudi gasfield

WEI Kai

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Natural Gas Technology and Economy ›› 2021, Vol. 15 ›› Issue (2) : 21-26. DOI: 10.3969/j.issn.2095-1132.2021.02.005
EXPLORATION AND DEVELOPMENT

Developing scale removing and inhibiting agent for the Lower Paleozoic sour gas wells, Daniudi gasfield

  • WEI Kai
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Abstract

In the Lower Paleozoic sour gas wells, Daniudi gasfield, Ordos Basin, not only formation water has the characteristics of high salinity and rich Ca2+ and Mg2+ contents, but also natural gas contains a little H2S and CO2. Due to a slower water-producing rate, these gas wells are plugged to further affect productivity release. So, in order to effectively alleviate the plugging and remove the generated blockage, these Lower Paleozoic sour gas wells were taken as objectives to analyze their gas compositions, formation-water quality, and blockage compositions. Then, the blockage origin was made clear to guide some study on scale removing and inhibiting agent. Based on this, a new formula was prepared for the agent and its properties were evaluated. Results show that (1) in these sour gas wells corroded seriously, the formation water has high concentration of scaling ions, which may provide crystallization nucleus and material base for generating the blockage, resulting in serious scale plugging; (2) the newly prepared agent has better performance, which can dissolve more than 95 % blockage within 12 h while less corrosion to wellbore; and (3) for the scale removing and inhibiting agent, when its formula has the mass concentration of 50 mg/L, the inhibiting rate to various inorganic scales is over 80 %. In conclusion, this formula can slow down the scaling rate and remove the generated scale blockage, so as to improve production efficiency, which is of guiding significance to the development of similar gasfields.

Key words

Erdos Basin / Daniudi gasfield / Sour gas well / Plugging / Scale removing and inhibiting agent / Production efficiency

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WEI Kai. Developing scale removing and inhibiting agent for the Lower Paleozoic sour gas wells, Daniudi gasfield. Natural Gas Technology and Economy. 2021, 15(2): 21-26 https://doi.org/10.3969/j.issn.2095-1132.2021.02.005

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