Rotary guiding shoe assembly capable of repairing borehole

Abstract

The invention relates to the technical field of oilfield well cementation and completion operation equipment, and provides a rotary guiding shoe assembly capable of repairing a borehole. The rotary guiding shoe assembly capable of repairing the borehole comprises a guiding shoe body, an outer barrel, a shearing pin and guiding pins, wherein the guiding shoe body comprises an inner barrel and a guiding shoe head; the bottom end of the inner barrel and the top end of the guiding shoe head are fixed together; the inner barrel is inserted in the outer barrel; the inner barrel and the outer barrel are mounted together in a limited manner through the shearing pin; a groove type rotary guiding track capable of rotating through change of movement of the guiding pins is arranged on the outer wall of the inner barrel; at least guiding pins of which the inner ends are clamped in the groove type rotary guiding track are fixedly mounted on the outer barrel. A scraping blade capable of rotating along with the inner barrel is added on the outer side of the guiding she head, multiple necks and irregular boreholes can be further repaired in a rotating process, the area of a part, which is in contact with a well wall, of the guiding shoe head is reduced, the passing ability is improved, therefore, smooth descending of a pipe string is ensured, and the circumstance that well cementation construction is affected due to jamming of the pipe string is avoided. The rotary guiding shoe assembly capable of repairing the borehole has the characteristics of simplicity in operation, convenience in use, and capability of saving time and labor.

Description

technical field [0001] The invention relates to the technical field of oil field cementing and well completion equipment, and relates to a repairable wellbore rotary guide shoe assembly. Background technique [0002] In the process of casing cementing in oil and gas fields, when the wellbore has necking, steps, and the wellbore is not clean, the general hemispherical guide shoe has a large contact area and high friction, making it difficult for the casing string to enter the well. At present The technical measures require the pressurization device to pressurize the pipe string into the well, or take measures to clean the wellbore by turning on the pump and circulating, but this cannot solve the friction caused by the necking of the wellbore. If you continue to run the casing , In severe cases, it may cause the situation of the casing pipe, which will seriously affect the cementing construction. Contents of the invention [0003] The present invention provides a repairable...

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Problems solved by technology

[0003] The present invention provides a repairable wellbore rotary guide shoe assembly, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the existing hemispherical guide shoes with large contact area, large friction force, and difficulty in normal casing strings. Entering the well requires auxiliary operations, which is time-consuming and labor-intensive, and the casing is easy to get stuck, which affects the cementing construction

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