Clean production method of natural gas

Abstract

The invention discloses a clean production method of natural gas, which is composed of the following steps: (1) addition of an ice inhibitor: adding an ice inhibitor liquid or the ice inhibitor into natural gas or / and a natural gas flow channel so that the ice inhibitor liquid or the ice inhibitor is contacted or mixed with the natural gas or / and gas-phase water, liquid-phase water, ice or / and natural gas hydrates in the natural gas flow channel to form sewage containing the ice inhibitor; and (2) ventilation for water removal: evaporating the water in the ice inhibitor sewage in a ventilating manner and recycling the ice inhibitor liquid or the ice inhibitor from the ice inhibitor sewage. The method solves the problem of influence on natural gas exploitation and production due to natural hydrates or ice, can solve the problem of environment pollution and energy consumption during the natural gas exploitation and production, can eliminate safety risk in the natural gas exploitation and production, can reduce fixed investment, cost and energy consumption in the natural gas exploitation and production, is easy to carry out, is safe and reliable, is wide in application and is easy to popularize, and has significant economic benefit, environment protective benefit and safety benefit.

Description

technical field [0001] The invention relates to the field of natural gas production, in particular to a method for clean production of natural gas. Background technique [0002] Patent ZL200910143671.2 discloses the technical solution of "a clean natural gas extraction method", which achieves the purpose of the invention through inventive steps such as "adding alkali to regenerate" and "ventilating to remove moisture". But there is following defective in this patent: [0003] 1) The technical solution described in this invention must be able to finally regenerate "production sewage" into "deicing agent liquid" through the joint action of the two key inventive steps of "alkali addition and regeneration" and "ventilation to remove moisture". Although the order of these two inventive steps is different in the different technical solutions of the invention, either the "production sewage" is "regenerated with alkali" and then "ventilated to remove moisture", or the "production s...

AI Technical Summary

Problems solved by technology

[0009] 2) The technical solution described in this invention does not involve and specify the method of directly regenerating "production sewage" into "deicing agent liquid" at the gas gathering station (or near the gas gathering station)

[0010] From the known knowledge in this field, it can be seen that there are no successful precedents and public information on directly regenerating "production sewage" into "deicing agent liquid" in the gas gathering station (or near the gas gathering station) in China

[0011] 3) The technical solution described in this invention does not involve and specify that the volume of "production sewage" should be "concentrated" through "ventilation to remove moisture" and "concentrate" in the gas gathering station (or near the gas gathering station), and then send the "production sewage" to the centralized The station further regenerates the method of "deicing agent liquid"; it also does not involve and specify the volume of "production sewage" through "alkali regeneration and ventilation to remove water" in the gas gathering station (or near the gas gathering station), and then The method of sending the "production sewage" to the centralized site for further regeneration into "deicing agent liquid"; resulting in higher costs and expenses for the transportation of "production sewage" and the final regeneration of "deicing agent liquid"

[0019] 4) The technical scheme described in this invention does not specify specific methods for recovering corrosion inhibitors, drainage agents, scale inhibitors, sand washing agents, well killing fluids and their reuse from "production sewage" containing deicing agents, nor does it A method involving directly recovering corrosion inhibitors, drainage agents, scale inhibitors, foaming agents, sand washing agents, and well killing fluids from "production sewage" containing deicing agents in the gas gathering station (or near the gas gathering station), There is also no method for recovering corrosion inhibitors, drainage agents, scale inhibitors, sand washing agents, well killing fluids and their reuse from gas field sewage without deicing agents

[0020] According to the known knowledge in this field: in the natural gas production process, corrosion inhibitors, drainage agents, and scale inhibitors are usually added to gas wells (or gas-gathering pipelines). When the liquid is separated, most of it enters the separated sewage; however, at present, there is no successful precedent in China to recover and reuse corrosion inhibitors, drainage agents, and scale inhibitors from gas field sewage without deicing agents, and there is no There are no successful precedents of recycling corrosion inhibitors, drainage agents, and scale inhibitors from gas field sewage containing deicing agents and reusing them, and there is no direct recovery of inhibitors from gas field sewage containing deicing agents in the gas gathering station (or near the gas gathering station). Successful precedents of corrosion, drainage, antiscalant and reuse

[0021] According to the known knowledge in this field, in the process of natural gas production, in order to carry out downhole operations of gas wells, well killing fluids are usually added to the gas wells, and then the sewage formed by these well killing fluids is discharged from the wellhead to the surface environment, or these The killing fluid is separated into production sewage through the separation equipment of the gas gathering station; however, there is no successful precedent for domestic gas fields to recover the killing fluid from the production sewage and reuse it, and there is no direct extraction of the killing fluid from the production sewage in the gas gathering station (or near the gas gathering station). Successful precedent of recovery and reuse of killing fluid from sewage

[0022] Known knowledge in this field: in the natural gas production process, in order to discharge the silt in the wellbore of the gas well, the sandwashing agent (antifreeze sandwashing agent) and water preparation (or antifreeze sandwashing agent) are usually added to the gas well. liquid), and then the sewage formed by these sand washing liquids (or antifreeze sand washing liquids) is discharged from the wellhead to the ground environment, or these sand washing liquids (or antifreeze sand washing liquids) are separated into Production sewage; however, at present, there is no successful precedent for domestic gas fields to recover sand washing agent (or antifreeze sand washing agent) from production sewage and reuse them, nor to directly recover sand washing agent (or antifreeze sand washing agent) from sewage in the gas gathering station (or near the gas gathering station). A successful precedent of sand agent (or antifreeze sand washing agent) and reuse

[0023] 5) The technical solution described in this invention does not involve and specify the method of simultaneously recovering the deicing agent and the corrosion inhibitor (or drainage agent or antiscaling agent) from the "production sewage" containing the deicing agent

[0024] 6) The technical solution described in this invention does not involve the method of recovering solid deicing agent, deicing agent solid-liquid mixture or solid medicament column from "production sewage" containing deicing agent

[0025] 7) The technical solution described in this invention does not involve the method of recovering deicing agent liquid from "production sewage" containing deicing agent by using ventilation and heating in combination

[0041] It can be seen from the known knowledge that there are no public precedents and public information on the recycling of solid pharmaceutical columns and corrosion inhibitors in China at present.