A soluble water-finding tool and method for horizontal wells

By designing a soluble water-finding tool for horizontal wells, and utilizing a combination of packers and pressure and flow measurement devices, the problem of easy stuck drill bits in existing tools has been solved. Stable sealing and automatic unsealing under high pressure have been achieved, the water-producing sections have been accurately identified, and the risk of stuck drill bits has been reduced.

CN122082673APending Publication Date: 2026-05-26PETROCHINA CO LTD
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Patent Information

Application Number
CN202411706095.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing horizontal well water-finding tools are prone to getting stuck and cannot meet the requirements for pressure and flow measurement in horizontal wells, making the water-finding process difficult to implement.

Method used

A soluble water-finding tool for horizontal wells was designed, including a packer and a pressure and flow measurement device. By cooperating with a rubber sleeve assembly, a locking assembly and a piston cylinder, the piston cylinder slides and pushes the locking sleeve to squeeze the rubber sleeve for rapid expansion and sealing. The soluble locking ring seat is used to make the packer automatically unseal after contact with the well fluid, avoiding human intervention.

Benefits of technology

It achieves stable sealing of the casing under high pressure, meets the requirements for pressure and flow measurement, reduces the possibility of stuck drill, can accurately determine the water-bearing layer, and requires no manual operation.

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Abstract

This invention relates to the field of oil and gas field development technology, specifically to a soluble water-finding tool and method for horizontal wells. The soluble water-finding tool for horizontal wells includes a packer and a pressure and flow measurement device. The packer includes a central tube, a rubber sleeve assembly, a locking assembly, and a piston cylinder. The locking assembly includes a locking sleeve, a soluble locking ring seat, and a locking ring. The locking sleeve has a window for exposing the soluble locking ring seat. The locking ring and locking sleeve are unidirectionally slidingly connected, so that after the working fluid is pressurized inside the central tube, the piston cylinder slides and pushes the locking sleeve to compress the rubber sleeve assembly for expansion and sealing. The pressure and flow measurement device is connected to the packer and is used to test the pressure and flow rate of the well fluid in the formation. This invention utilizes the fact that after the packer enters the well, the soluble locking ring seat begins to contact the well fluid and gradually dissolves, causing the locking ring to detach from the locking sleeve, allowing the packer to automatically unseal. This meets various requirements for pressure and flow measurement in horizontal wells, reduces the possibility of stuck pipe, and helps to accurately determine the water-producing formation.
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