Horizontal well leakage-proof rotational flow sand-washing device and sand-washing technology thereof

Abstract

The invention relates to a horizontal well leakage-proof rotational flow sand-washing device and sand-washing technology thereof. When a horizontal well is subjected to sand washing, sand-washing liquor seriously leaks in a perforation section, and is poor in washing and carrying capabilities at a horizontal section. A horizontal well rotational flow sand-washing device and a horizontal well leakage-proof double-layer oil pipe insulating circulation mechanism are communicated by a common oil pipe, and both ends of the common oil pipe are communicated with the horizontal well rotational flow sand-washing device and the horizontal well leakage-proof double-layer oil pipe insulating circulation mechanism by an oil pipe coupling. The technology is characterized in that the horizontal well rotational flow sand-washing device, the horizontal well leakage-proof double-layer oil pipe insulating circulation mechanism and the common oil pipe are connected in sequence and enter a shaft of the horizontal well; a self-sealing preventor is mounted in a wellhead, and the sand washing liquor is pumped into an annular cavity;and whether the sand washing liquor circulates smoothly is checked, a sand washing pipe column is passed down while the sand washing liquor is pumped, and then the operation can be carried out according to routine sand washing work. The horizontal well leakage-proof rotational flow sand-washing device and the sand-washing technology thereof can prevent floor in sand-washing operation of the horizontal well from greatly leaking the sand-washing liquor, and improves working efficiency.

Description

technical field [0001] The invention relates to a sand washing technology for a horizontal well in an oil field, in particular to a horizontal well leakage prevention cyclone sand washing device and a sand washing process thereof. Background technique [0002] During the production process of oil horizontal wells, the formation sand will be transported into the production casing along with the flow of the formation liquid, causing production failures such as sand buried perforation section and stuck downhole tools. After a certain period of production of horizontal wells, because the length of the perforation section is large and more sand is produced, the sand bed greatly affects the production of oil layers, and it is necessary to perform sand flushing operations for horizontal wells with more sand production. The conventional sand washing operation is to use the construction fluid and the construction string to wash the formation sand deposited in the production casing of...

AI Technical Summary

Problems solved by technology

A large amount of leakage of sand washing fluid in the perforation section of the horizontal well will cause serious pollution of the formation and low efficiency of sand washing operations, and some even fail to achieve the purpose of sand washing due to serious leakage (formation sand cannot be carried out of the ground)

[0005] The second is that the flushing and carrying capacity of the sand washing fluid in the horizontal section is poor; since the perforation section is distributed horizontally, a horizontal sand bed is formed after the formation sand is produced, and the sand washing fluid and the formation sand are respectively in the middle of the production casing under the action of gravity. There are two upper and lower layers, which will cause the sand washing fluid to automatically flow from the upper layer, and cannot effectively flush and carry the formation sand in the lower layer to move together, and it is also unable to effectively carry the formation sand back to the wellbore due to formation leakage, which is manifested in low construction efficiency. , Huge water consumption, poor sand washing effect, easy sand to bury construction pipe strings, etc.

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