Semi-submersible platform gravel packing device and method

Abstract

The invention relates to a semi-submersible platform gravel packing device and method. The device comprises a service tool and a letting-in tool. The service tool can be positioned in the letting-in tool and comprises a seat pack tool, a filling tool, a first sliding sleeve switching tool, a switch ball seat and a second sliding sleeve switching tool successively connected. The letting-in tool comprises an anti-scouring packer, an extension pipe, a filling sliding sleeve and a sealing barrel connected successively, wherein the seat pack tool and the anti-scouring packer can be in threaded connection and can bear a rotating torque to drive the letting-in tool to rotate in the seat pack tool. The switch ball seat has an opened state and a closed state. In the opened state, the service tool forms an underscouring channel from one end to the other end. In the closed state, a seal is provided to a gravel filling operation liquid flow channel. The gravel filling device can be rotated in a down-transferring process, and is scoured by the underscouring channel, so that the gravel filling device is down-transferred to a designed position conveniently.

Description

technical field [0001] The present application relates to the technical field of gravel packing in oil production wells, in particular to a semi-submersible platform gravel packing device and method. Background technique [0002] With the country's vigorous development of marine resources in recent years, the application of deep-water semi-submersible drilling platforms has gradually increased. Semi-submersible platforms have heave characteristics affected by swells and tides. The gravel packing tools in the related art are not suitable for application on semi-submersible platforms. During the feeding process of the gravel-packing tool, affected by the heave of the semi-submersible platform, the gravel-packing tool will be alternately lifted and lowered in a short distance, and the packer rubber tube on the top of the gravel-packed tool is easily worn and the packer cannot be set. Affected by the heave of the semi-submersible platform, the filling tool will move and disloc...

AI Technical Summary

Problems solved by technology

During the feeding process of the gravel-packing tool, affected by the heave of the semi-submersible platform, the gravel-packing tool will be alternately lifted and lowered in a short distance, and the rubber tube of the packer on the top of the gravel-packed tool is easy to wear and cause the packer to fail to be set.

Affected by the ups and downs of the semi-submersible platform, the filling tool will move and dislocate during the gravel filling operation, resulting in seal failure or dislocation of the filling hole, resulting in failure of the gravel filling operation

Affected by the friction resistance of the horizontal section when the pipe string is sent in, it is difficult to send the pipe string in place only by the weight of the upper drilling tool

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