Hydraulic casing pipe centering device

Abstract

Disclosed is a hydraulic casing pipe centering device. A piston is sleeved outside a main body and connected onto the main body via a constant-pressure pin, an upper sealing ring and a lower sealing ring are disposed between the main body and the piston, a reducing circular bead is disposed on the main body between the upper sealing ring and the lower sealing ring, another reducing circular bead is arranged on the piston between the upper sealing ring and the lower sealing ring, the reducing circular bead and the piston can be fittingly sealed with the main body, lock catch threads are arranged on the main body, a lock ring is mounted on the inner wall of the piston and can be fastened with the lock catch threads on the main body, an expanding centering barrel is sleeved outside the piston, a plurality of grooves are milled on the expanding centering barrel, a cone is fixed on the inner wall of the expanding centering barrel, an inner conical hole is arranged on the upper portion of the cone, the lower portion of the piston is located in the inner conical hole of the cone, a retaining sleeve is connected to the lower portion of the main body, the expanding centering barrel is seated on the retaining sleeve, when hydraulic pressure is added in a casing pipe, hydraulic force can push the piston to move downwards, the expanding centering barrel can expand to contact with the inner wall of a shaft under effects of a conical surface, so that the casing pipe connected onto the expanding centering barrel is not located at the center in the shaft, and well cementation quality can be guaranteed.

Description

technical field [0001] The invention relates to a device for oil field drilling and completion, which is a hydraulic casing centralizer. Background technique [0002] Oil drilling needs to put casing in the wellbore, and then inject cement into the annulus between the wellbore and casing. Injecting cement into the annulus between the wellbore and casing is called well cementing. Due to the depth of the well, the casing will After entering the wellbore, the casing cannot be in the middle of the wellbore, so that the annulus between the wellbore and the casing is uneven, and the cement sheath after cementing is unevenly distributed, which cannot guarantee the quality of cementing and affects the production of the drilled well. cause major economic losses. Contents of the invention [0003] The purpose of the present invention is to provide a hydraulic casing centralizer, which can prevent the casing from being out of center in the wellbore, ensure the cementing quality, and...

AI Technical Summary

Problems solved by technology

[0002] Oil drilling needs to put casing in the wellbore, and then inject cement into the annulus between the wellbore and the casing. Injecting cement into the annulus between the wellbore and the casing is called well cementing. Due to the depth of the well, the casing will After entering the wellbore, the casing cannot be in the middle of the wellbore, so that the annulus between the wellbore and the casing is uneven, and the cement sheath after cementing is unevenly distributed, which cannot guarantee the quality of cementing and affects the production of the drilled well. cause major economic losses

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