煤层气井产出水环境效应及其成因: 以黔西松河区块GP井组为例

秦彬超; 杨兆彪; 高为

doi:10.3799/dqkx.2022.389

Volume 48 Issue 3

Mar. 2023

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Article Navigation > Earth Science > 2023 > 48(3): 1246-1258

Qin Binchao, Yang Zhaobiao, Gao Wei, 2023. Environmental Effects and Causes of Produced Water in Coalbed Methane Wells: Taking GP Well Cluster in Songhe Block of Western Guizhou as an Example. Earth Science, 48(3): 1246-1258. doi: 10.3799/dqkx.2022.389

Citation:

Qin Binchao, Yang Zhaobiao, Gao Wei, 2023. Environmental Effects and Causes of Produced Water in Coalbed Methane Wells: Taking GP Well Cluster in Songhe Block of Western Guizhou as an Example. Earth Science, 48(3): 1246-1258. doi: 10.3799/dqkx.2022.389

Citation:

Qin Binchao, Yang Zhaobiao, Gao Wei, 2023. Environmental Effects and Causes of Produced Water in Coalbed Methane Wells: Taking GP Well Cluster in Songhe Block of Western Guizhou as an Example. Earth Science, 48(3): 1246-1258. doi: 10.3799/dqkx.2022.389

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Environmental Effects and Causes of Produced Water in Coalbed Methane Wells: Taking GP Well Cluster in Songhe Block of Western Guizhou as an Example

doi: 10.3799/dqkx.2022.389

Qin Binchao^{1
,
,},
Yang Zhaobiao^{1
,
,},
Gao Wei²

1.
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
2.
Guizhou Coalbed Methane Shale Gas Engineering Technology Research Center, Guiyang 550009, China

Received Date: 2022-05-17
Available Online: 2023-03-27
Publish Date: 2023-03-25

Abstract

Abstract

With the large-scale development of coalbed methane industry, the environmental effects of produced water from coalbed methane wells receive more attention. Taking 8 coalbed methane test wells in Songhejing Formation in western Guizhou as an example, the geochemical data of 5 batches of produced water in 2018 were tracked dynamically, and the environmental effects of produced water were evaluated by fuzzy comprehensive evaluation method and single factor analysis method, and the causes were analyzed. The following conclusions were drawn: The geochemical characteristics of coalbed methane produced water in Songhejing Formation are mainly characterized by high concentration of Na⁺, HCO₃^‒ and Cl^‒ and high salinity, and the produced water types are Na-Cl and Na-HCO₃^‒. In this paper, the fuzzy comprehensive evaluation method is used to calculate that the produced water of eight coalbed methane test wells belongs to grade V heavy pollution, and the main pollution indicators are TDS, Na⁺ and Cl^‒, and the elements F and Mn slightly exceed the standard. On this basis, the single factor analysis shows that the evaluation result is heavy pollution. Two comprehensive evaluation methods show that the main pollution indicators are TDS, Na⁺, Cl^‒ and Ba²⁺. In a certain range, the pollution degree fluctuates slightly with time and has a weak decreasing trend. The water pollution level of coalbed methane wells in the study area is high and fluctuates with time, which is the coupling result of the superposition of geological factors and engineering factors. The high geological background of various elements enrichment in coal measures strata is the fundamental influencing factor, which controls the types and contents of trace elements. Secondly, the change of fracturing fluid flowback rate has a significant effect. Seasonal precipitation strengthens the water-rock effect and promotes the dissolution of elements.
- western Guizhou,
- produced water from coalbed methane wells,
- environmental benefits,
- fuzzy comprehensive evaluation,
- grey correlation evaluation,
- geochemistry

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References(54)

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Environmental Effects and Causes of Produced Water in Coalbed Methane Wells: Taking GP Well Cluster in Songhe Block of Western Guizhou as an Example

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