Leaking stoppage tool and method for drilling leakage formation and drilling fluid leakage model thereof

By using deformable plugging components and drilling fluid loss models, the problem of wellbore leakage in complex formations during drilling was solved, achieving efficient and economical well leakage control and ensuring smooth drilling operations.

CN121407876APending Publication Date: 2026-01-27PETROCHINA CO LTD
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Patent Information

Application Number
CN202411004863.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-07-25
Publication Date
2026-01-27

AI Technical Summary

Technical Problem

During drilling, problems such as lost circulation zones, collapsed zones, and high-pressure zones are encountered, leading to increased drilling costs and extended cycles. This is especially true in mudstone, shale, coal seam, and salt-gypsum formations, where the wellbore diameter, azimuth, and inclination angle vary in complex ways. Existing plugging technologies are complex, costly, and time-consuming, making them difficult to effectively address these issues.

Method used

Deformable plugging components, including deformable bellows and expansion components, are used to expand into a large-diameter circular pipe inside the well using hydraulic or mechanical means. This pipe tightly adheres to the well wall to seal the formation. Combined with drilling fluid loss models, the type of well leakage and formation conditions are dynamically analyzed to select appropriate plugging measures.

Benefits of technology

It achieves highly reliable, low-cost, and short-cycle effective plugging without reducing the wellbore diameter, and can take measures for different degrees of leakage to ensure the normal progress of drilling and simplify the construction process.

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Abstract

The invention relates to a leaking stoppage tool for a drilling leakage stratum, and relates to the field of petroleum drilling leaking stoppage, the leaking stoppage tool comprises a deformable plugging assembly, a sealing structure is arranged at the end of the deformable plugging assembly, an expansion assembly is arranged in the deformable plugging assembly, and the expansion assembly is in sliding connection with the deformable plugging assembly; and the expansion assembly is used for performing reaming deformation on the deformable plugging assembly in the self-contraction state to be in the expansion state. The anti-leakage plugging device has the advantages that effective plugging can be achieved under the condition that the diameter of a well hole is not reduced, the reliability is high, the cost is low, the period is short, and the number of used machines and tools is small, different measures can be taken for different degrees of leakage working conditions, the good anti-leakage plugging effect is achieved, and the normal drilling effect of well drilling is guaranteed.
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