Method for biologically inhibiting production of secondary hydrogen sulfide from sulfate reducing bacteria in crude oil gathering and transporting system

Abstract

The invention relates to a method for biologically inhibiting the production of secondary hydrogen sulfide from sulfate reducing bacteria in a crude oil gathering and transporting system. In the method, (1) a biological inhibitor for inhibiting a single well consists of 50 mg / L sodium nitrite and 20 mg / L sodium borate; (2) the biological inhibitor for inhibiting an oil transfer station consists of 40 to 60 mg / L sodium nitrite, 25 milligrams of humic acid, 10 to 20 mg / L sodium borate and 20 to 30 mg / L sodium hydroxide electrolyte; and (3) the biological inhibitor for inhibiting a combined station consists of 40 to 60 mg / L sodium nitrite, 25 milligrams of humic acid, 10 to 20 mg / L sodium borate, 20 to 30 mg / L sodium hydroxide electrolyte and 95 mg / L glutaraldehyde bactericide. In the method, the generation of the hydrogen sulfide is controlled at the source, and the method has the characteristics of long hydrogen sulfide inhibition time, low cost and no secondary pollutions and improvesthe working environment of a workplace of the crude oil gathering and transporting system.

Description

technical field

[0001] The invention relates to a biological inhibition technology for treating secondary hydrogen sulfide in a crude oil gathering and transportation system, which is suitable for suppressing secondary hydrogen sulfide produced by sulfate-reducing bacteria biological metabolism in units of crude oil gathering and transportation systems such as single wells, oil transfer stations, and combined stations. , which belongs to the field of toxic and harmful gas treatment in oil and gas fields. Background technique

[0002] As far as the petroleum industry is concerned, H 2 The distribution of S gas is very wide, which is extremely harmful to the life safety and personal health of employees. When the concentration of hydrogen sulfide is high (50-200ppm), the oxygen in the blood will be taken away, and the human body organs will be poisoned due to lack of oxygen; when the concentration is extremely high (700-2000ppm), it will only take a few seconds for the human b...

Examples

Embodiment 1

[0021] The concentration of hydrogen sulfide is 239mg / m 3 Take the Guan Yi Zhuan Zhuan oil station as an example.

[0022] (1) Biological inhibitor consists of 12mg / L borate, 23mg / L hydroxide electrolyte, 45mg / L nitrate + 25mg humic acid.

[0023] (2) The dosing point is the oil transfer station, and the dosing position is the dosing tank at the entrance of the station; the amount of biological preparations added to each liter of crude oil is 80mg / L; The pump continuously adds medicine for 24 hours, and the flow rate of the dosing pump is 0.27L / h.

[0024] (3) Monitoring sampling point: the breathing zone of the measuring port of the oil storage tank; test method: use methylene blue spectrophotometry to test hydrogen sulfide.

[0025] (4) Implementation effect: before the implementation, the concentration of hydrogen sulfide in the breathing zone of the oil storage tank of the Guanyizhuan oil transfer station was determined to be 239mg / m 3 15 days after the addition of biol...

Embodiment 2

[0027] The concentration of hydrogen sulfide is 151mg / m 3 single well as an example.

[0028] (1) The biological inhibitor is composed of 50mg / L sodium nitrite and 20mg / L sodium borate;

[0029] (2) The dosing point is a single well; the dosing position is the single well annulus space, and the dosing is added in the direction indicated by the arrow through the connection port of the single well annulus space; the dosing method is intermittent dosing, and the intermittent period is 30 days / time, each dosing amount is calculated as follows:

[0030] Dosing amount each time = 30×dosing concentration×crude oil production+dosing concentration×casing volume×(artificial bottom hole depth-dynamic fluid surface depth)

[0031] Among them: Crude oil production: 5.16 cubic meters / d Artificial well bottom depth: 1594.28m

[0032] Depth of dynamic liquid surface; 1382m Casing volume = 12.7×10 -3 m 3

[0033] The dosage calculated by the above formula is 10.839kg each time.

[003...

technical field

[0001] The invention relates to a biological inhibition technology for treating secondary hydrogen sulfide in a crude oil gathering and transportation system, which is suitable for suppressing secondary hydrogen sulfide produced by sulfate-reducing bacteria biological metabolism in units of crude oil gathering and transportation systems such as single wells, oil transfer stations, and combined stations. , which belongs to the field of toxic and harmful gas treatment in oil and gas fields. Background technique

[0002] As far as the petroleum industry is concerned, H 2 The distribution of S gas is very wide, which is extremely harmful to the life safety and personal health of employees. When the concentration of hydrogen sulfide is high (50-200ppm), the oxygen in the blood will be taken away, and the human body organs will be poisoned due to lack of oxygen; when the concentration is extremely high (700-2000ppm), it will only take a few seconds for the human b...

Examples

Embodiment 1

[0021] The concentration of hydrogen sulfide is 239mg / m 3 Take the Guan Yi Zhuan Zhuan oil station as an example.

[0022] (1) Biological inhibitor consists of 12mg / L borate, 23mg / L hydroxide electrolyte, 45mg / L nitrate + 25mg humic acid.

[0023] (2) The dosing point is the oil transfer station, and the dosing position is the dosing tank at the entrance of the station; the amount of biological preparations added to each liter of crude oil is 80mg / L; The pump continuously adds medicine for 24 hours, and the flow rate of the dosing pump is 0.27L / h.

[0024] (3) Monitoring sampling point: the breathing zone of the measuring port of the oil storage tank; test method: use methylene blue spectrophotometry to test hydrogen sulfide.

[0025] (4) Implementation effect: before the implementation, the concentration of hydrogen sulfide in the breathing zone of the oil storage tank of the Guanyizhuan oil transfer station was determined to be 239mg / m 3 15 days after the addition of biol...

Embodiment 2

[0027] The concentration of hydrogen sulfide is 151mg / m 3 single well as an example.

[0028] (1) The biological inhibitor is composed of 50mg / L sodium nitrite and 20mg / L sodium borate;

[0029] (2) The dosing point is a single well; the dosing position is the single well annulus space, and the dosing is added in the direction indicated by the arrow through the connection port of the single well annulus space; the dosing method is intermittent dosing, and the intermittent period is 30 days / time, each dosing amount is calculated as follows:

[0030] Dosing amount each time = 30×dosing concentration×crude oil production+dosing concentration×casing volume×(artificial bottom hole depth-dynamic fluid surface depth)

[0031] Among them: Crude oil production: 5.16 cubic meters / d Artificial well bottom depth: 1594.28m

[0032] Depth of dynamic liquid surface; 1382m Casing volume = 12.7×10 -3 m 3

[0033] The dosage calculated by the above formula is 10.839kg each time.

[003...

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