An integrated isolation and packing tool for sand control and well completion

Abstract

The invention discloses an integrated pack-off and filling tool for sand control and well completion, which relates to the technical field of downhole operation tools for oil and gas wells, including an upper joint, a sealing assembly, a filling assembly and a lower joint, and also includes a backwashing assembly, a central pipe I, and an upper joint , backwash assembly, center pipe Ⅰ, filling assembly and lower joint are fixedly connected from top to bottom, and the sealing assembly is sleeved outside the center pipe Ⅰ; the backwash assembly is equipped with a return spring, which enhances the flexibility of backwash operations. Reliability; the filling component is equipped with a filter ring and an anti-erosion inner ring, which prolongs the service life of the integrated pack-off and fill tool; this device can be run in one trip without lifting the pipe string or running in other tools. Under normal circumstances, it can complete backwashing, setting, sealing, fracturing filling, circulating filling and production operations; compared with traditional operating tools, it can save more than half of the construction time and greatly reduce the construction cost.

Description

technical field [0001] The invention relates to the technical field of downhole operating tools for oil and gas wells, in particular to an integrated sealing and filling tool for sand control and completion. Background technique [0002] my country's unconsolidated sandstone reservoirs have a large distribution range, large reserves and important production. 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, corresponding sand control technology is adopted to ensure the normal production of oil wells. [0003] Gravel packing sand control technology is currently one of the most effective sand control methods for developing unconsolidated sandstone reservoirs at home and abroad. The sand control process has the advantages of high success rate, long validity period, wide adaptability and good sand control effect. However, ther...

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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