Sand prevention and well completion integrated packing and filling tool

Abstract

The invention discloses a sand prevention and well completion integrated packing and filling tool, and relates to the technical field of oil and gas well downhole operation tools, the sand prevention and well completion integrated packing and filling tool comprises an upper joint, a sealing assembly, a filling assembly and a lower joint, and further comprises a backwashing assembly and a central pipe I. The upper joint, the backwashing assembly, the central pipe I, the filling assembly and the lower joint are fixedly connected in sequence from top to bottom; the sealing assembly is arranged outside the central pipe I in a sleeving manner; the backwashing assembly is provided with a reset spring, so that the flexibility and the reliability of backwashing operation are enhanced; a filter ring and an anti-erosion inner ring are arranged on the filling assembly, so that the service life of the integrated packing and filling tool is prolonged; the device can be tripped in one time, and backwashing, setting, seal examining, fracturing filling, circulating filling and production operation can be completed under the condition that a tubular column is not lifted or other tools are not tripped in; compared with a traditional operation tool, the operation construction time can be saved by more than half, and the construction cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of downhole operation tools for oil and gas wells, in particular to an integrated isolation and filling tool for sand control and well completion. Background technique [0002] Unconsolidated sandstone reservoirs in my country have a large distribution range, large reserves, and production occupy an important position. Under normal mining conditions, sand production in oil wells is extremely harmful. In order to prevent sand production in oil wells, according to the requirements of oil layers and production processes, the corresponding sand control technology is adopted to ensure the normal production of oil wells. [0003] Gravel packing sand control technology is one of the most effective sand control methods for developing unconsolidated sandstone reservoirs at home and abroad. The sand control technology has the advantages of high success rate, long validity period, wide adaptability, and good sand cont...

AI Technical Summary

Problems solved by technology

However, there are also problems such as complex construction, high one-time investment cost, single function of the process string, and the need to run multiple process strings in one operation.

At the same time, during the gravel packing operation, the sand-carrying fluid is likely to generate eddy current erosion at the filling hole of the filling tool, resulting in damage to the filling hole, affecting the filling quality and reducing the productivity of the oil well

[0004] Chinese patent CN212508227U discloses a segmented gravel packing device for open-hole horizontal wells, which relates to the field of oil well sand control technology, including wellhead casing, grading hoop, downhole casing, tubing, first screen pipe, second-stage packing tool, and second-stage service tool , hydraulic packer, second screen, bottom service tool and bottom packing tool, bottom packing tool, second screen, hydraulic packer, second stage packing tool, first screen, downhole casing, grading hoop and The wellhead casing is fixedly connected sequentially from bottom to top; the second-stage service tool and the bottom service tool are slidingly connected with the second-stage filling tool and the bottom filling tool respectively, and the tubing is connected in series with the second-stage service tool and the bottom service tool; The pipe string needs to be lowered multiple times, and the construction steps are cumbersome

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