Method for determining adding periods of scale inhibitors of oil wells

Abstract

The invention belongs to the technical field of oil exploitation, and particularly relates to a method for determining the adding periods of scale inhibitors of oil wells. The method comprises the following steps that (1) each oil well in different blocks of the same oil field is graded according to the daily liquid yield; (2) a tracer agent is put into an oil sleeve annulus of the oil well with the lowest working fluid level in a certain level of oil wells, the concentration change of the tracer agent is monitored, the concentration change of the scale inhibitor is reflected through the concentration change of the tracer agent, the time needed for reducing the concentration of the scale inhibitor to the optimal concentration of the scale inhibitor is determined, and the adding period of the scale inhibitor of this level of oil wells is determined according to the needed time; and (3) according to the method in the step (2), the adding periods of the scale inhibitors of the other levels of oil wells in the oil field are determined. According to the method, the economical and effective adding periods of the oil wells can be determined, and the oil wells are in the protection statesof the scale inhibitors with the optimal concentrations in the whole adding periods.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for determining the dosing period of an oil well scale inhibitor. Background technique [0002] During the development of the oil field, the fluid in the oil and gas reservoir flows out from the oil and gas layer, passes through the wellbore, wellhead to the surface gathering and transportation system, due to changes in temperature, pressure and oil, gas and water balance, the concentration of scale-forming ions rich in formation water changes , prone to the deposition and scaling of inorganic salts. [0003] When the oilfield enters the development stage of medium and high water cut, scaling phenomenon will appear in different degrees. Scaling in oil wells is the main factor restricting oilfield production. It not only causes damage to oil layers and reduces production capacity, but also seriously affects crude oil production and oil well pum...

AI Technical Summary

Problems solved by technology

[0005] The existing method of determining the dosing cycle mainly has the following problems: first, it has a certain degree of blindness; The third is that the liquid production and liquid level of the oil well will change during the production process. Simply relying on field experience without theoretical guidance can not achieve the purpose of economical and effective treatment, and the oil well cannot be effectively protected. Therefore, How to determine the best dosing cycle is the most common and important problem in the process of oil well scaling control

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