Mixing and preparing control method for mixed solution for fracturing, acidizing and sand control of oil field

Abstract

The invention relates to a mixed control method used in fractured acidified anti-sand miscible liquids, which mixes the base liquid, liquid and dry powder additive and support agent into miscible liquids, to be fed into well. Wherein, the invention is characterized in that: (1), setting the liquid level of miscible liquids, and adjusting the flux of base liquid, according to the real-time liquid level signal collected by ultrasonic wave liquid level meter, and keeping the liquid level of mix pot at preset height; (2); according to the initial density and end density of support agent, the step base liquid amount, and the collected real-time base liquid flux, calculating out the rotation speed of rotor to fix the transmitted amount of support agent; (3), according to the rate of additive and the collected base liquid real-time flux, calculating out the flux of additive, according to which, using PID control method to automatically adjust the flux of each additive. The invention can real-time adjust the flux of base liquid, based on real-time liquid level, to control it at preset level, to avoid empty and full.

Description

technical field [0001] The invention relates to a mixing control method for oilfield fracturing, acidification and sand control mixed fluid, which is mainly used for automatic control of land or sea oilfield fracturing, acidification and sand control construction. Background technique [0002] Unconsolidated sandstone reservoirs in my country's oilfields have a wide distribution range, large reserves, and production occupies an important position. The sand production of oil wells is the main contradiction in the exploitation of this kind of oil reservoirs. Sand production is extremely harmful, and sand buried in oil layers or wellbore sand plugging will cause oil wells to stop production; after sand production, the cost of crude oil growth will be greatly increased, so oil well sand control is the basic oil production process of this type of reservoir, and it is also an important guarantee for normal production. With the continuous deepening of exploration and development o...

AI Technical Summary

Problems solved by technology

In traditional fracturing, acidizing, and sand control operations, due to the complex and changeable downhole conditions in the formation, this operation has been manually operated by experienced workers. The main shortcomings are: the operation is completed by manual buttons, and real-time data exchange cannot be performed

The control mainly depends on experience judgment, there are many control points, and it is not easy to operate

Due to misjudgment or low proficiency in operation, the operator’s coordination is not good, the ideal mixing ratio and the set additive concentration cannot be achieved, which will affect the quality of the entire fracturing, acidification, and sand control. In severe cases It will lead to oil layer plugging, oil well production reduction or even oil layer destruction, and oil wells will be scrapped

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