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A method for eliminating and suppressing hydrogen sulfide in oil well production process

A production process, hydrogen sulfide technology, applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problems that cannot fully meet the oilfield production, have no good treatment methods, and affect the normal production of the oilfield, and achieve good economic benefits. Inhibit and eliminate the production of hydrogen sulfide and avoid the effect of frequent alkali flushing

Inactive Publication Date: 2018-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The hydrogen sulfide gas produced during oilfield production has a serious impact on the normal production of the oilfield. Taking a large oilfield as an example, because the output of hydrogen sulfide greatly exceeds the safe production requirements of hydrogen sulfide, many oil wells were forced to stop production or even shut down , causing great economic losses, but also caused great personnel safety hazards in the production process
At present, for this type of wells, the main measure is to maintain production by periodically washing wells with alkali solution, that is, according to the safety production requirements of hydrogen sulfide, regularly wash wells producing hydrogen sulfide with alkali solution to remove hydrogen sulfide to maintain production. The characteristics of short cycle and dangerous operation cannot fully meet the needs of oilfield production, especially for some wells with fast hydrogen sulfide production rate, there is no good treatment method

Method used

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  • A method for eliminating and suppressing hydrogen sulfide in oil well production process
  • A method for eliminating and suppressing hydrogen sulfide in oil well production process
  • A method for eliminating and suppressing hydrogen sulfide in oil well production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The hydrogen sulfide output concentration of the oil well before the measures was 7200ppm;

[0038] Biological inhibitor: get dodecyl dimethyl benzyl ammonium chloride and dissolve it in water;

[0039] The treatment measures for the water well string and the water injection zone near the well include the following steps:

[0040] (1) The dodecyldimethylbenzylammonium chloride mass concentration is 1% dodecyldimethylbenzylammonium chloride bio-inhibitor filling to formation near wellbore zone 2m;

[0041] (2) the dodecyl dimethyl benzyl ammonium chloride mass concentration is 5% dodecyl dimethyl benzyl ammonium chloride bio-inhibitor is filled with the whole shaft of the water well;

[0042] (3) close the well and react for 24 hours;

[0043] (4) Periodically inject dodecyl dimethyl benzyl ammonium chloride bioinhibitor into the entire wellbore of the water well; when the water injection front advances to the oil well, if the hydrogen sulfide concentration produced by...

Embodiment 2

[0060] The hydrogen sulfide output concentration of the oil well before the measures was 7200ppm;

[0061] Biological inhibitor: get dodecyl dimethyl benzyl ammonium chloride and dissolve it in water;

[0062] The treatment measures for the water well string and the water injection zone near the well include the following steps:

[0063] (1) Dodecyldimethylbenzylammonium chloride mass concentration is 10% dodecyldimethylbenzylammonium chloride bio-inhibitor filling to formation near wellbore zone 2m;

[0064] (2) the dodecyl dimethyl benzyl ammonium chloride mass concentration is 1% dodecyl dimethyl benzyl ammonium chloride bio-inhibitor and fills the whole shaft of the water well;

[0065] (3) close the well and react for 48 hours;

[0066] (4) Periodically inject dodecyl dimethyl benzyl ammonium chloride bioinhibitor into the entire wellbore of the water well; when the water injection front advances to the oil well, if the hydrogen sulfide concentration produced by the oil...

Embodiment 3

[0083] The hydrogen sulfide output concentration of the oil well before the measures was 7200ppm;

[0084] Biological inhibitor: get dodecyl dimethyl benzyl ammonium chloride and dissolve it in water;

[0085] The treatment measures for the water well string and the water injection zone near the well include the following steps:

[0086] (1) Dodecyldimethylbenzylammonium chloride mass concentration is 5% dodecyldimethylbenzylammonium chloride bio-inhibitor filling to formation near wellbore zone 2m;

[0087] (2) the dodecyl dimethyl benzyl ammonium chloride mass concentration is 3% dodecyl dimethyl benzyl ammonium chloride bio-inhibitor and fills the whole shaft of the water well;

[0088] (3) close the well and react for 36 hours;

[0089] (4) Periodically inject dodecyl dimethyl benzyl ammonium chloride bioinhibitor into the entire wellbore of the water well; when the water injection front advances to the oil well, if the hydrogen sulfide concentration produced by the oil ...

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Abstract

The invention discloses a method for elimination and inhibition of hydrogen sulfide in oil well production. The method comprises a measure for processing a water well tube pillar and a water injection near-well zone, as well as a measure for processing an oil well tube pillar and a near-well zone of oil well tube pillar. The method disclosed by the invention has the advantages that generation of the hydrogen sulfide during the oil well production can be eliminated and inhibited efficiently and safely; the method has good effects and a long-term measure validity period especially for the inhibition of hydrogen sulfide which is generated from bacteria breeding; the maximum decrease rate of the hydrogen sulfide concentration reaches 99.68%; the method disclosed by the invention can obviously reduce the hydrogen sulfide concentration at different well temperatures; and a green and environment-friendly bactericide can be selected during biologic inhibitor selection of the method disclosed by the invention, so that fewer influences are brought to environments. The method is an economic, practical and environment-friendly technological measure for controlling the hydrogen sulfide generation.

Description

Technical field: [0001] The invention relates to a method for eliminating and suppressing hydrogen sulfide in the production process of an oil well, in particular to a method for treating hydrogen sulfide gas and related corrosion products produced by the growth of sulfate-reducing bacteria caused by water injection changing the original conditions of reservoirs and production pipe strings. Background technique: [0002] The hydrogen sulfide gas produced during oilfield production has a serious impact on the normal production of the oilfield. Taking a large oilfield as an example, because the output of hydrogen sulfide greatly exceeds the safe production requirements of hydrogen sulfide, many oil wells were forced to stop production or even shut down , causing great economic losses, but also caused great personnel safety hazards in the production process. At present, for this type of wells, the main measure is to maintain production by periodically washing wells with alkali ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B41/02C09K8/54
Inventor 李强杜宝坛张君卢占国成梅华陈利霞李建兵张磊宋菲
Owner CHINA PETROLEUM & CHEM CORP
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