Paraffin cleaning and preventing method for gathering and transportation pipeline

Abstract

The invention provides a paraffin cleaning and preventing method for a gathering and transportation pipeline. The method comprises the steps: respectively adding paraffin degrading bacteria and a microbial nutritional agent at an inlet of the gathering and transportation pipeline, adding the paraffin degrading bacteria, of which the amount is 0.2-0.4% medium transport volume, for the first time 2-4 days after the pretreatment of the gathering and transportation pipeline, and then, adding the paraffin degrading bacteria, of which the amount is 0.1-0.2% the medium transport volume, once every 15-30 days; adding the microbial nutritional agent, of which the amount is 0.01-0.02% the medium transport volume, once every 7-14 days. According to the method, the paraffin cleaning and preventing effect for the gathering and transportation pipeline of a ground gathering and transportation system is obvious, the transportation pressure of the gathering and transportation pipeline is lowered by at least 20%, the pipeline flushing cycle is prolonged by more than one cycle, the effective period is long, the cost is relatively low, and the construction conditions are simple; during use, the labor intensity is low, the labor conditions are good, and no environmental pollution is caused.

Description

technical field [0001] The invention relates to the technical field of oilfield gathering and transportation production, in particular to a wax cleaning and preventing method for gathering and transportation pipelines. Background technique [0002] The wax deposition in the surface gathering and transportation system is the continuation of the wax deposition in the wellbore of the oil production well. Under normal circumstances, the wax deposition mainly occurs in the wellbore of the oil well. However, in oil wells with severe wax deposition in the wellbore, the wax deposition can often continue to the gathering pipelines and oil, The entire ground gathering and transportation system of the centralized water treatment station. Due to the high pressure of the wax-containing pipeline, frequent flushing or other measures are required. During the crude oil gathering and transportation process, the crude oil contains paraffin, and the temperature of the gathering and transferring...

AI Technical Summary

Problems solved by technology

However, these traditional methods have various disadvantages. For example, the mechanical method is to use a special wax scraping tool to scrape off the wax, which is intuitive but has a short anti-wax cycle and cannot completely solve the problem of wax deposition; the thermal method uses heat to remove the precipitated wax crystals. Melting achieves the purpose of wax removal, but the cost is high, the effective period is short, and some damage is caused to the casing; the oil pipe lining and coating anti-wax method is to prevent wax by creating conditions that are not conducive to paraffin deposition, but the anti-wax effect is not good 1. After using for a period of time, the surface properties are easy to change and lose the anti-wax effect; chemical wax anti-wax agents have low anti-wax efficiency and high cost, and most of various anti-wax agents are liquid anti-wax agents. Flow away with the crude oil, resulting in short wax control period and high cost of wax control

Traditional wax prevention methods used in gathering and transportation pipelines have problems such as high cost, poor wax prevention effect, and short effective period.