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Cleaning and blockage relieving technology of gathering and transportation system for oil and natural gas field highly containing sulfuric acid

A technology for sour natural gas, gathering and transportation system, which is applied in the field of blocking removal technology and gathering and transportation system of high-sulfuric oil and natural gas fields, can solve problems such as no blocking removal technology for gas gathering and transportation system in natural gas fields, and achieves the effect of not polluting the environment.

Inactive Publication Date: 2013-06-12
PUYANG BAOJIE WANJIA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no report on the plugging removal process of the gathering and transportation system of high sulfuric acid natural gas fields

Method used

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  • Cleaning and blockage relieving technology of gathering and transportation system for oil and natural gas field highly containing sulfuric acid
  • Cleaning and blockage relieving technology of gathering and transportation system for oil and natural gas field highly containing sulfuric acid
  • Cleaning and blockage relieving technology of gathering and transportation system for oil and natural gas field highly containing sulfuric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] For well 303-3 in a certain gas field with blockage, stop natural gas transmission, close the wellhead air intake control valve, drain the gas in the gathering and transportation system, and purge the system pipeline with pure natural gas to vent.

[0079] Dissolve 10 tons of FeS passivator sodium nitrite and 8 tons of hydrogen sulfide inhibitor N-methyldiethanolamine in 80m 3 Water, pumped into the system and circulated for cooking for 4 hours to achieve the purpose of deodorization and passivation.

[0080] Warm the following prepared cleaning agent aqueous solution to 90°C and soak in the system for 4 hours. In the sulfur-dissolved cleaning agent aqueous solution, the active ingredients and their concentrations are respectively:

[0081]

[0082] Then heat the prepared cleaning agent aqueous solution to 90°C by steam, pressurize it through a high-pressure water jet pump, use a high-pressure hose to transport it to the cleaning nozzle, and use the high-pressure cle...

Embodiment 2

[0086] For well 303-3 in a certain gas field that is clogged, in the case of non-stop production, the clogged throttle valve is surrounded by an arc sensor, and then the high-frequency heating host is connected, and the temperature in the valve is 5 minutes. 70-80°C, the temperature difference between the inside and outside of the valve is 3°C-10°C, after heating for 3 minutes, the clogged valve will resume normal operation and realize unblocking.

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Abstract

The invention relates to a cleaning and blockage relieving technology of a gathering and transportation system for natural gas field highly containing sulfuric acid. The cleaning and blockage relieving technology of the gathering and transportation system for the natural gas field highly containing the sulfuric acid comprises a three-section technology, including replacement deodorization, cleaning for blockage relieving and passivation protection. The main technology process comprises a first step of replacement deodorization: scavenging the gathering and transportation system by adopting nitrogen or purified natural gas to replace sulfur-containing gas therein so as to reach the safety standard, circularly filling and soaking the system with alkaline liquid, neutralizing for deodorization and passivating ferrous sulfide; a second step of cleaning for blockage relieving: circularly filling a sulfur scale dissolving and removing agent into the system for 2-6 hours so as to dissolve, disperse and remove corrosive scale and other sulfur-containing accumulated scale in pipelines, wherein the cleaning temperature is controlled within the range of 30 to 90 DEG C at this stage; and a third step of passivation protection: coating cleaned pipeline equipment with a passivating agent or a film forming agent for protection. With the adoption of the blockage relieving technology of the gathering and transportation system for the natural gas field highly containing the sulfuric acid, the inner-wall accumulated scale of the sulfur-containing gathering and transportation pipeline equipment can be completely cleaned away.

Description

technical field [0001] The invention relates to a chemical cleaning technology, in particular to a blocking removal process for a gathering and transportation system of a high sulfuric acid oil and gas field, such as pipelines, equipment, containers and metering instruments. Background technique [0002] Natural gas produced from natural gas fields (hereinafter simply referred to as "gas fields") often contains a large amount of sulfides. For such high-sulfur-containing natural gas, after water-gas separation, sulfur-based dirt is easy to deposit in gas-gathering and transportation pipelines and equipment containers. In particular, during the production process of high sulfuric acid gas fields, elemental sulfur will be precipitated due to the gradual decrease in pressure and temperature of natural gas from the bottom of the well to the wellhead and then to the gathering and transportation system. , and the fracturing fluid residues returned from the bottom of the well conti...

Claims

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Application Information

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IPC IPC(8): B08B7/00C23G1/00F17D1/17
Inventor 苗西魁郭强魏建华
Owner PUYANG BAOJIE WANJIA IND
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