Control method of scaling in oil well production process

Abstract

The invention relates to a control method of scaling in the oil well production process, in particular to a multi-functional processing agent and agent adding process. The control method is characterized in that in the agent adding process, a designed intelligent agent adding device is connected with an oil well, multifunctional treatment agents are added in a manual impact mode, displacement is controlled by the intelligent agent adding device to carry out continuous adding and large-flow adding, and adjustment of the agent adding amount is determined by the intelligent agent adding device according to load changes of a pumping-unit pumping rod so as to ensure that production of an oil well is not affected by scaling. The involved multifunctional treatment agents comprise, by mass, 0-25% of phytic acid, 0-10% of Double tenth alkyl dimethyl quaternary ammonium salt, 0-10% of double eighteenthalkyl dimethyl quaternary ammonium salt, 0-15% of cyanoacetic acid, 0-3% of enynic alcohol, 0-5% of pyridine broc butyl quaternary ammonium salt, 0-2% of tetrabutyl potassium iodide quaternary ammonium salt, 0-25% of copolymer of phono and carboxylic acid and 0-10% of scattering solubilizing agents S, the balance of clean water. The multifunctional treatment agents have the multiple functions of scale prevention, scale dissolution, corrosion resistance and sterilization.

Description

technical field [0001] The invention relates to the technical field of oil well development in oil fields, in particular to a method for preventing and controlling fouling in the production process of oil wells. Background technique [0002] During the production process of oil wells in oil fields, hydrogen sulfide is produced due to the reproduction of bacteria, and the output fluid contains a large amount of ferrous ions. The generation of hydrogen sulfide leads to the formation of insoluble iron sulfide. Dry pumping will occur, and the result of dry pumping is that calcium carbonate and sulfate insolubles will be produced in the pumping unit pump or in the wellbore. Scale is formed on the pipe wall, which will lead to the breakage of the sucker rod and the stuck pump of the pumping unit, which will lead to the failure of the oil well and require the operation to resume production. On the one hand, the production time of the oil well will be delayed and the output of the o...

AI Technical Summary

Problems solved by technology

The field application reflects that the current technology has the following deficiencies: 1. During the production process of the oil well, the dynamic liquid level changes, and the range of change is very large. Especially when the oil well has insufficient liquid supply, the dynamic liquid level appears lower than the pumping The phenomenon of the pump port of the oil machine, so the periodic dosing of detergent and anti-scaling agent will be consumed prematurely in the cycle, and the scaling of the oil well will still occur, the effect cannot be guaranteed and the waste of chemicals will be large; If the dosing period is too short, it will involve a lot of manpower, material resources and high equipment investment costs. If the dosing period is too long, the effect will be greatly reduced, and the cost of dosing will increase sharply; 3. Periodic dosing requires detergent and anti-scaling The dosage of the agent is large, the cost of the agent increases, and the waste is large; 4. Periodic dosing cannot be carried out when the weather is bad, which may lead to an increase in scaling wells; In terms of the function of the treatment agent, at present, only the removal of scales and the prevention of carbonate and sulfate scaling are considered, and the generation of iron sulfide scales caused by bacterial reproduction and corrosion is not considered, which is also the result of poor scaling control effect in oil wells. Reason; 6. The current method of installing a solid anti-scaling device at the downhole liner of an oil well needs to be replaced during operation. The period of the solid anti-scaling device is limited and cannot meet the requirements of the oil well operation cycle, resulting in the solid anti-scaling device before the operation cycle of the oil well. The device has been consumed, and scaling will still occur in the oil well in the later production process; the current treatment agent function and dosing process are not perfect, resulting in poor effect of oil well scaling prevention and high cost

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