a floating screen

Abstract

The invention discloses a floating screen pipe, which comprises a short connection, a connecting sleeve, a joint, a sealing plug, a closed cavity, an outer protective pipe, a filter pipe, a base pipe and a collar, and the two ends of the filter pipe are respectively connected with Short connection, the short connection is threaded with the filter tube through the joint, the base pipe is sleeved on the inner wall of the filter tube, the outer protection tube is provided on the periphery of the filter tube, and the two ends of the outer protection tube are respectively connected to the short connection thread through the connecting sleeve, so A closed cavity is welded in the middle cavity space between the outer protective tube and the filter tube, the coupling is connected with the shorting thread, and a sealing plug is provided at the connection between the closed cavity and the connecting sleeve. In the present invention, multiple airtight cavities are arranged inside the traditional screen, and air or low-density drilling fluid is filled into the airtight cavity to make the screen generate buoyancy in the drilling fluid, thereby reducing the weight of the screen string , to reduce the friction between the screen pipe and the casing, and the open hole wall, and solve the problem of difficulty in running the screen pipe in the completion operation of extended-reach long horizontal wells.

Description

Technical field: [0001] The invention belongs to the field of oil well completion operations, in particular to a floating screen. Background technique: [0002] With the continuous development of drilling technology, extended reach wells and horizontal wells have played a very important role in the development of marginal oil fields or thin oil layer oil fields. Prominent features of extended-reach horizontal wells Extended-reach horizontal wells generally have a long horizontal section, and the pipe string is greatly affected by borehole friction during construction. During downhole screen operations in extended-reach wells, since conventional screens are composed of perforated base pipes, filter sleeves, and outer protective sleeves, it is impossible to form an effective airtight cavity inside the screen, so that the screen strings during the run-in process Due to the small buoyancy, most of the weight of the screen pipe acts on the well wall, and the contact force betwee...

AI Technical Summary

Problems solved by technology

During downhole screen operations in extended-reach wells, since conventional screens are composed of perforated base pipes, filter sleeves, and outer protective sleeves, it is impossible to form an effective airtight cavity inside the screen, so that the screen strings during the run-in process Due to the small buoyancy, most of the weight of the screen pipe acts on the well wall, and the contact force between the screen pipe and the well wall is relatively large, resulting in large friction between the screen pipe, casing and the open hole wall, making it difficult to run the screen pipe

Once the running of the screen is blocked, it is difficult to apply effective weight to the upper pipe string to complete the running, the treatment means are extremely limited, and the working time is seriously affected

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