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Method for determining total output of hydrogen sulfide in oil well

A determination method and technology of hydrogen sulfide, applied in the direction of material analysis, measuring device, color/spectral characteristic measurement through observation of the influence on chemical indicators, etc., can solve the problems of low wellhead compliance rate, potential safety hazards, and high treatment costs , to achieve the effect of reducing potential safety hazards, increasing the compliance rate, and reducing the amount of dosing

Inactive Publication Date: 2019-12-20
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention is based on the basic principle of gas-liquid balance, and finally determines the calculation formula of the total hydrogen sulfide production of oil wells based on simple and easy-to-measure parameters such as gas-phase hydrogen sulfide content, temperature, pressure, liquid volume, etc. Accurate calculation basis solves the problems of low wellhead compliance rate, potential safety hazards, large amount of dosing, and high treatment cost in the existing hydrogen sulfide dosing treatment process

Method used

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  • Method for determining total output of hydrogen sulfide in oil well
  • Method for determining total output of hydrogen sulfide in oil well
  • Method for determining total output of hydrogen sulfide in oil well

Examples

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Effect test

Embodiment 1

[0049] A typical oil well A in a block of Shengli Oilfield, with a daily fluid production of 30m 3 , water content 86%, associated gas volume 66Nm 3 / d, the wellhead temperature is 55°C, and the pressure is 0.55MPa.

[0050] The traditional method is used to estimate the hydrogen sulfide production of the well, which is the product of gas volume and gas phase hydrogen sulfide content = 1700*60*1.5 / 1000000=0.15kg / d, if the sulfur capacity of the desulfurizer is 1.2%, then the desulfurizer of the well The theoretical dosage is 0.15 / 1.2%=12.5kg / d. Initially, the desulfurizer is added at 12.5kg / d. After 10 days of adding, the hydrogen sulfide content drops to 1200ppm and no longer drops. In order to achieve the standard, increase the dosage to 50kg / d, after 10 days, the hydrogen sulfide content dropped below 20ppm. In order to save the dosage, the dosage was reduced to 25kg / d. After 5 days, the hydrogen sulfide content rose to 300ppm, indicating that the dosage was insufficient, ...

Embodiment 2

[0091] Oil well B in a block of Shengli Oilfield, with a daily fluid production of 30m 3, moisture content 90%, associated gas volume 90Nm 3 / d, the wellhead temperature is 65°C, and the pressure is 0.7MPa.

[0092] The traditional method is used to estimate the hydrogen sulfide production of the well, which is the product of gas volume and gas phase hydrogen sulfide content = 2500*90*1.5 / 1000000=0.34kg / d, if the sulfur capacity of the desulfurizer is 1.2%, then the well desulfurizer The theoretical dosage is 0.34 / 1.2%=28.3kg / d. After adding the desulfurizer at the initial rate of 28.3kg / d for 12 days, the hydrogen sulfide content drops to 900ppm and no longer drops. In order to achieve the standard, increase the dosage to 60kg / d After 13 days, the hydrogen sulfide content dropped to about 400ppm and did not continue to drop. Increase the dosage again to 80kg / d. After 9 days, the hydrogen sulfide content reached 20ppm, which met the safety requirements. This process took abou...

Embodiment 3

[0132] Well C in a certain block of Shengli Oilfield, with a daily fluid production of 60m 3 , water content 94%, associated gas volume 110Nm 3 / d, the wellhead temperature is 85°C, and the pressure is 1.0MPa.

[0133] The hydrogen sulfide production of this well is estimated by the traditional method, which is the product of gas volume and gas phase hydrogen sulfide content = 20000*110*1.5 / 1000000=3.3kg / d, if the sulfur capacity of the desulfurizer is 1.2%, then the well desulfurizer The theoretical dosage is 3.3 / 1.2%=275kg / d, according to the dosage of the desulfurizer, the hydrogen sulfide can only be treated to 17000ppm, and then after 3 rounds of adjustment, the dosage will be increased to 1800kg It takes 55 days for the hydrogen sulfide to be stably controlled below 20ppm, of which 40 days are not up to standard.

[0134] Utilize the method of the present invention to determine the total output of oil well hydrogen sulfide, concrete steps are as follows:

[0135] (1) ...

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Abstract

The invention belongs to the technical field of safety production and environmental protection, and particularly relates to a method for determining total output of hydrogen sulfide in an oil well, and the method specifically comprises the following steps of determining the content of gas phase hydrogen sulfide in the test oil well; determining the content of aqueous phase hydrogen sulfide in thetest oil well; determining the content of hydrogen sulfide in the oil phase; determining the output of the gas phase hydrogen sulfide; determining the output of the aqueous phase hydrogen sulfide; determining the output of the oil phase hydrogen sulfide; and determining the total output of hydrogen sulfide in the test oil well. The method provided by the invention, by not only considering gas phase hydrogen sulfide, but also considering aqueous phase and oil phase hydrogen sulfide, more accurately reflects the actual situation of the total amount of hydrogen sulfide in the oil well to providea reliable basis for the source treatment of hydrogen sulfide of the oil well, shortens the treatment cycle of hydrogen sulfide compliance by more than 60% and increases the compliance rate of hydrogen sulfide dosing treatment in the oil well to reduce hidden safety hazards, and effectively reduces the amount of dosing to save the cost of dosing by 30%.

Description

technical field [0001] The invention belongs to the technical field of safe production and environmental protection, and in particular relates to a method for determining the total output of hydrogen sulfide in an oil well. Background technique [0002] With the continuous development of water flooding and thermal recovery of heavy oil, a large number of oil wells with high hydrogen sulfide content have appeared in many oil fields. According to statistics, there are more than 4,000 oil wells containing hydrogen sulfide in Shengli Oilfield alone. With the continuous improvement of safety production and environmental protection requirements, many oil fields have carried out source control of hydrogen sulfide, mainly by adding liquid desulfurizer to the wellhead of the oil well. The desulfurizer is added continuously or periodically through the casing of the oil well, and the desulfurizer diffuses to the bottom of the well along the annulus of the oil well, and reacts with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N21/25G01N21/31G01N21/78G06F17/10
CPCG01N21/25G01N21/31G01N21/78G01N33/0044G06F17/10
Inventor 袁长忠张守献徐涛王冠于丹丹潘永强冯逸茹徐闯徐鹏汪卫东
Owner CHINA PETROLEUM & CHEM CORP
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