Process Description:

Barehole horizontal well gravel filling process is one of the key technologies for sand control in barehole horizontal wells; during the whole construction period, the upper annulus of the top packer is always connected with the barehole, thus ensuring the stability of the well wall and effective sand control operation. The gravel-filled sand control tubular column of bare eye horizontal wells includes inner tubular column and outer tubular column, and the inner and outer tubular columns can work together to realise the reverse cycle pickling operation in place of mud filling; in the process of the operation, the tubular column is lifted up and lowered down, and the load indicator is used in conjunction with the locating hoop to realise the positioning, which is easy to operate and has the characteristics of accurate positioning. Translated with www.DeepL.com/Translator (free version)

Process Features:

● Column size: 7", 9-5/8";

● One trip to complete the slurry, filling, acidification (breaking rubber) operations.

● During the operation, the openhole formation is always connected with the annulus of the tieback tube, which stabilises the well wall and avoids the collapse of the openhole;

● Long horizontal sections are possible.

● Positioning tool ensures accurate filling position;

● The service tool is equipped with an anti-suction device, so that lifting up and lowering down the service tool during the filling process will not produce a suction effect;

● Simple operation with low operational risk;

● Combined with isolation packers and anti-sand burial valves, it can realise layered filling in the bare eye.