Ground sand washing device for horizontal well and application method thereof

Abstract

The invention discloses an application method of a ground sand washing device for a horizontal well. A sand washing well head device arranged at the head of the horizontal well is connected with a downhole sand washing pipe column, continuous high-pressure circulated sand washing on the ground is carried out by a ground sand washing pipeline, a pressure releasing valve and a conversion valve that are arranged on the sand washing pipeline, a sand washing fluid flowback pipeline and the like to realize continuous negative pressure sand washing in the horizontal well. The ground sand washing device for the horizontal well is suitable for continuous sand washing operation of the horizontal well for sand production during oil exploration, can be applied to sand washing and slurry replacing in the horizontal well, sand washing in a lower formation pressure oil well and the like, and can be used for effectively solving the problem of sand washing in highly-deviated and horizontal sections of the horizontal well and avoiding the damage caused by the recharged sand washing fluid to an oil layer.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a horizontal well sand flushing surface device and an application method thereof. Background technique [0002] Horizontal well oil recovery technology is an important process technology in oilfield development, which can effectively improve oil recovery, and the implementation effect is remarkable. At present, sand production is common in oil wells, and the application scale of horizontal well technology in oil fields is constantly expanding. Most of the horizontal wells belong to sandstone formations. The application of horizontal well technology inevitably involves the problem of sand. Horizontal wells, sand production and horizontal well production are new In the field of technology, a series of new topics need to be studied, otherwise it will seriously restrict the development and implementation effect of this new technology. Sand flushing in sand producing horizon...

AI Technical Summary

Problems solved by technology

As the inclination angle increases, the distance between the sand particles settling to the well wall is shortened, and the friction between the sand and the well wall is also increasing, which brings difficulties to the sand migration

[0007] 3. At present, the formation pressure in the oilfield development stage is generally low. The existing conventional sand washing method belongs to the sand washing under pressure. There is a problem of sand washing fluid recharging the formation. Serious sand washing fluid cannot return to the ground, especially for thermal recovery horizontal wells , causing damage to the oil layer

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