Upper-sealing and lower-mining integrated filling sand prevention pipe column

Abstract

The invention discloses an upper-sealing and lower-mining integrated filling sand prevention pipe column and belongs to the technical field of oil exploitation. An upper packer, an interlayer connecting pipe, a lower packer, a special filling tool, a signal screen pipe, a safety joint, a sand filtering pipe and a blind plug are sequentially connected from top to bottom. The upper packer comprises an upper releasing joint, the upper releasing joint is internally provided with a releasing core pipe, a sealing piston is arranged in a sliding space, a pushing and pressing short section is further arranged in the sliding space, the outer wall of the pushing and pressing short section makes contact with the inner wall of the upper releasing joint, the end of the pushing and pressing short section is inserted into an installation gap in the sealing connecting sleeve, a first locking spring is arranged in the installation gap, the position, close to the end, of the outer wall of the releasing core pipe is connected with a releasing shear ring through a releasing shear pin, a releasing tail pipe is mounted in the releasing core pipe, and the tail end of the releasing tail pipe is connected with a compensator through a transition core pipe in an interlayer connecting pipe. The upper layer is plugged through the combination of the upper packer and the lower packer, so that the pipe column is well sealed and is long in service life.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an integrated filling and sand control pipe string for sealing up and down mining. Background technique [0002] After the development of the oilfield, the condition of the wellbore has become more and more complex, the production layer has been adjusted frequently, and more and more wells have been wound around after gravel extrusion packing, circulation packing and ground filling. For half of the wells with relatively large sand interlayers, the sand control of the bottom production layer is carried out first, and then the upper non-production layer is permanently sealed, and half of the wells with smaller interlayers (below 15 meters) are blindly sealed for production. Casing leaking wells are also increasing year by year, and it is also necessary to seal the long casing leaking well section and squeeze the production layer. These conditions bring certain difficulties to ...

AI Technical Summary

Problems solved by technology

[0005] (3) When the layered extrusion filling construction is carried out again, if there is a problem that the hanging groove outside the pipe cannot be constructed;

[0006] (4) The layered extrusion filling can only complete the formation reconstruction, but cannot realize the circulation filling of the annulus;

[0007] (5) During the extrusion filling process, the problem of upward movement of the filling seal occurs;

[0008] (6) Sand control wells are filled by layered winding wire extrusion, and the long sealing process after sand control is complicated and the construction period is long.

In this way, the last effect will be destroyed, even if the structure of the sand-filled layer becomes loose, it will affect the effective service life of the last operation, and seriously cause the collapse of the last sand control layer

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