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

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...

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