Gravel packing device and method for oil layer sand control

Abstract

The application provides a gravel packing device and method for oil layer sand control, belonging to the technical field of oil well construction. In the technical solution provided by the embodiment of the present application, the filling unit and the backwashing unit are connected by shearing nails. After the shearing nails are disconnected, the separation of the filling unit and the backwashing unit is realized, so that the backwashing unit is left at the preset position in the well to play a role. The function of plugging the screen is to directly fill the mixture of gravel and sand-carrying fluid into the annulus of the screen sleeve and the oil layer through the channel at the bottom of the packing unit. Since the above-mentioned channel has a large diameter, it will not be worn by the gravel, so it is suitable for filling The mixture of high sand ratio, large sand volume and large displacement can wash the gravel stagnated on the top of the backwash unit to the wellhead after the above filling process is completed. Then, the backwash unit is fished out of the oil well, that is to say, after the filling is completed, the sand control gravel packing device for the oil layer can be completely lifted out of the oil well based on its own structural characteristics, which facilitates the subsequent oil recovery process.

Description

Gravel packing device and method for oil layer sand control technical field [0001] The application relates to the technical field of oil well construction, in particular to a kind of gravel packing device and method for oil layer sand control. Background technique In the oil well construction process, the mode of filling gravel to the screen casing annulus and the oil layer can prevent the oil layer. The sand and gravel in the Central Plains are mined out of the well together with the crude oil to reduce the sand content of the crude oil. [0003] The currently commonly used gravel packing device for oil layer sand control is set on the inner wall of the casing through slips, and the The cylinder is sealed, and the mixture of gravel and sand-carrying liquid is sprayed out through the filling port on the side wall, so that the screen sleeve is annulus and perforation holes are formed. A large-scale high-permeability gravel sand retaining barrier is formed in the borehol...

AI Technical Summary

Problems solved by technology

[0004] However, in the process of use, due to the large amount of sand blasting, the sprayed mixture has the characteristics of high sand ratio and large sand volume. The filling port in the above device is easy to be worn, resulting in lax closure and poor sand control effect, which is not conducive to Subsequent oil recovery process

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