Anti-settling Apparatus and Method and Apparatus for Checking the Same, and Apparatus for Preventing Settlement of Well

Abstract

The present invention relates to the field of drilling, and provides an anti-settling apparatus and a method and apparatus for checking the same, and an apparatus for preventing settlement of a well. The anti-settling apparatus of the present invention is installed in the wellhead region of the well during drilling to prevent the well from settlement. The anti-settling apparatus generally includes: an anti-settling base having an opening corresponding to the wellhead formed at the center thereof, the anti-settling base being disposed in the wellhead region during drilling; and an interlocking member 5 disposed at the opening to connect and fix a casing provided in the well with the anti-settling base. The apparatus for preventing settlement of a well comprises the anti-settling apparatus and checking method for the anti-settling apparatus.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of and claims the benefit of Chinese application No. 201711327747.8 filed Dec. 13, 2017, the contents of which are hereby incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to the field of drilling, in particular to an anti-settling apparatus and a method and apparatus for checking the same, and an apparatus for preventing settlement of a well.BACKGROUND OF THE INVENTION[0003]Since the beginning of the 21st century, with the rising demand for oil and natural gas in various countries of the world and the depletion of oil and gas resources in the conventional areas, the development of oil and gas resources has gradually developed toward the deep sea and the polar tundra. In 2009, the United States Geological Survey released a report saying that undiscovered oil reserves and natural gas reserves in the Arctic account for 13% and 30% of oil and natural gas reserves in t...

AI Technical Summary

Benefits of technology

The present invention provides an anti-settling apparatus and a method and apparatus for checking the same that can be used to reduce the settlement of a well during drilling in permafrost. By reducing the pressure imposed on the wellhead and permafrost, the anti-settling apparatus helps to stabilize the well and prevent tilting during drilling. The checking apparatus ensures that the anti-settling apparatus is adjusted based on the temperature field of the well and the permafrost surrounding it, minimizing the amount of settlement of the well and achieving stable drilling.

Problems solved by technology

Although there are abundant oil and gas resources in the polar tundra, its remoteness and low temperature have caused many difficulties for drilling.

High temperature drilling fluid returning upwards from the deep stratum may melt the ice layer in the permafrost, lower the strength of the rock layer in the permafrost, cause the settlement of the stratum, and may thus cause the wellhead to collapse.

The settlement of the stratum is caused by the gravity of the overlying rock layer and the load of the wellhead, which causes the wellhead to sink.

In severe cases, it may even cause the wellhead to collapse.

However, some unstable external environmental factors also damage the permafrost and cause natural settlement of the permafrost under external loads.

However, this proposal is mainly aimed at the tilt and instability of the wellhead caused by scouring and movement of the submarine sediment in the deep water drilling process.

Moreover, the method for calculating key parameters of the apparatus is not provided.

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