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Method and equipment for inhibiting the formation of hydrogen sulfide in oil layer by steam flooding injection well

A technology for steam flooding and injection wells, which is applied in chemical instruments and methods, earth-moving drilling and production, wellbore/well components, etc. The effect of cheap and easy-to-obtain raw materials

Active Publication Date: 2015-10-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the formed metal sulfide may affect the storage performance of the reservoir, etc.
[0010] However, the methods for controlling hydrogen sulfide in oil wells recorded in the above-mentioned prior art all focus on "control". At present, there is no method to suppress the production of hydrogen sulfide from the source of the crude oil extraction process, so that hydrogen sulfide cannot be generated in the oil layer.

Method used

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  • Method and equipment for inhibiting the formation of hydrogen sulfide in oil layer by steam flooding injection well

Examples

Experimental program
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Effect test

Embodiment 1

[0031] See figure 1 As shown, the steam flooding injection well of this embodiment suppresses the treatment liquid delivery equipment for producing hydrogen sulfide in the oil layer, including:

[0032] A processing liquid storage container 1 for accommodating the processing liquid, in which a liquid level gauge 11 is arranged;

[0033] A treatment liquid delivery pipeline 2, one end of which is connected to the treatment solution storage container 1, and the other end is used to communicate with the steam injection pipeline 5 of the steam flooding injection well; a necessary valve 21 is also arranged on the delivery pipeline;

[0034] Two plunger pumps 3 arranged side by side on the delivery pipeline;

[0035]Moreover, a check valve 4 is provided on the delivery pipeline at the outlet of the plunger pump.

[0036] In Well Jin 45-024-K24, the steam injection rate is 108 tons / day, or 75 kg / min.

[0037] Sodium nitrate, sodium hydroxide, and demineralized water are prepared o...

Embodiment 2

[0042] The steam injection rate of Well Jin 45-024-K26 is about 102 tons / day, or about 71 kg / min.

[0043] Sodium nitrate, sodium hydroxide, fluorocarbon surfactant TF3721 (purchased from Shanghai Laiguo Chemical Co., Ltd.), demineralized water are prepared on-site as a treatment agent solution, wherein the mass concentration of sodium nitrate is 0.5%, and the mass concentration of sodium hydroxide is 0.5%. , Fluorocarbon surfactant TF3721 mass concentration 1%.

[0044] The treatment agent solution prepared on site is injected with a high temperature and high pressure drip pump at a rate of 70ml / min with steam. Corresponding to the production well Jin 45-024-K25, the casing hydrogen sulfide concentration before comparison is 750mg / m 3 , the pressure of the injection well is 7.0MPa, the daily oil production of the production well is 1.1 tons, and after 40 days of injection, the concentration of hydrogen sulfide in the casing is 100mg / m 3 , after 60 days of injection, the con...

Embodiment 3

[0046] The steam injection rate of Jin 45-023-K260 well is about 104 tons / day, or about 72 kg / min.

[0047] Nickel nitrate, sodium hydroxide, and demineralized water are prepared on-site as a treatment agent solution, wherein the mass concentration of nickel nitrate is 0.8%, and the mass concentration of sodium hydroxide is 0.8%.

[0048] The treatment agent solution prepared on site is injected with a high temperature and high pressure drip pump at a speed of 90ml / min with steam. Corresponding to the production well Jin 45-23-K261 well, the concentration of hydrogen sulfide in the casing before comparison is 1150mg / m 3 , the daily oil production of the production well is 1.4 tons, the viscosity of degassed crude oil at 50°C is 10775MPa.S, and after 50 days of injection, the concentration of hydrogen sulfide in the casing is 210mg / m 3 , after 70 days of injection, the concentration of hydrogen sulfide is 0mg / m 3 , the daily oil production of the production well is 2.5 tons, ...

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Abstract

The invention provides a method and equipment for suppressing generation of hydrogen sulfide in an oil layer of a steam-driven injection well. The method comprises the following steps of: injecting a treatment fluid which contains an oxidant and an alkali into a stratum along with steam in a steam driving process; reacting the oxidant with a sulfur-containing compound to raise the valency of sulfur without generating hydrogen sulfide; and stabilizing sulfur of which the valency is raised by using the alkali. The equipment comprises a treatment fluid storing container, a treatment fluid conveying pipeline, a plunger pump and a check valve, wherein one end of the treatment fluid conveying pipeline is communicated with the treatment fluid storing container, and the other end of the treatment fluid conveying pipeline is communicated with a steam injection pipeline; the plunger pump is arranged on the conveying pipeline; and the check valve is arranged on the conveying pipeline at the outlet of the plunger pump. Due to the adoption of a technology disclosed by the invention, the generation of hydrogen sulfide in the oil layer can be suppressed from the source.

Description

technical field [0001] The invention relates to a method and equipment for suppressing the generation of hydrogen sulfide in oil layers by steam flooding injection wells, in particular to a method for suppressing the generation of hydrogen sulfide in oil layers from the source by using a chemical treatment agent injected downhole with steam, and for realizing the method device of. Background technique [0002] Hydrogen sulfide is a colorless gas with a specific gravity of 1.1895, which is heavier than air. At room temperature, the solubility of hydrogen sulfide in water is 3.864g / L, and the solubility in oil is 3.3g / L. The solubility is even greater under high pressure. When people inhale high concentration (1500mg / m 3 above), the poisoned person will quickly lose consciousness, accompanied by violent convulsions, momentary breathing stop, and then heartbeat stop, which is called "lightning type" death. In addition, hydrogen sulfide poisoning can also cause symptoms such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24C09K8/592
Inventor 高玉军岳玉全马春宝向延安王德伟徐恩宽景宝国张世民刘广友李军辉
Owner PETROCHINA CO LTD
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