Treatment method for drilling return loss of offshore carbonate buried hill reservoir

By using integrated seismic, geological and engineering technology to establish a fracture-cavity reservoir model and monitor the drilling fluid level in real time, and using seawater instead of drilling fluid to control the liquid level, the problem of plugging the return leakage in carbonate buried-hill reservoirs was solved, and a safe and efficient drilling process was achieved.

CN120671592APending Publication Date: 2025-09-19SINO GEOPHYSICAL CO LTD
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Patent Information

Application Number
CN202510761044.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-09
Publication Date
2025-09-19

AI Technical Summary

Technical Problem

When treating the loss of return in carbonate buried-hill reservoirs, conventional plugging materials are easily diluted, high-pressure squeezing may induce wellbore instability, and the treatment cycle is long and costly, making it difficult to effectively plug the loss channel.

Method used

Through the integrated seismic geological engineering technology, a fracture-cavity reservoir geological model and a formation pressure model are established, the drilling fluid level is monitored in real time, seawater is used to replace the drilling fluid and the liquid level is controlled, and the formation pressure model is corrected in real time to predict well control risks and avoid the frequent use of high-cost plugging agents.

Benefits of technology

It achieves advanced prediction and real-time processing of well control risks in carbonate buried-hill reservoirs, reduces plugging costs, and ensures the safety and efficiency of the drilling process.

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Abstract

The invention belongs to the technical field of petroleum drilling, and discloses an offshore carbonate rock buried hill reservoir drilling return loss processing method, which comprises the following steps of: 1, obtaining hole and crack morphological characteristics and spatial distribution of a carbonate rock buried hill reservoir, and establishing a fracture-cavity reservoir geologic model; secondly, formation pressure distribution of the carbonate rock buried hill reservoir is obtained, and a formation pressure model of the fracture-cavity reservoir is established; and 3, correcting the formation pressure model of the fracture-cavity reservoir by using the formation balance pressure. And 4, obtaining a formation pressure coefficient according to the corrected formation pressure model, and comparing the formation pressure coefficient with the drilling fluid density to obtain a well leakage forecast. And 5, when the drilling encounters return loss, the sea water is pumped into the shaft, the height of the liquid level in the shaft is kept to be 3-5% higher than the height of the original liquid level, and continuous drilling is conducted. According to the method, the well control risk can be accurately predicted in advance, the return-loss leakage can be found and processed in time, and the safe operation of the drilling process is ensured.
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