Automatic grouting type float collar

Abstract

The invention provides an automatic grouting type float collar. The automatic grouting type float collar comprises a main body, a valve body, a ball, a spring and a cement body, wherein the main body is cylindrical; a female thread connected with a casing is arranged at the upper part of the main body; a male thread connected with the casing is arranged at the lower part of the main body; the cement body is arranged between the female thread and the male thread, is cylindrical, and is fixed in the main body; the valve body is arranged in the middle of the cement body, and consists of a valve head and a valve rod; a groove is formed in the lower end of the valve rod; the ball is arranged in the groove; and the spring is arranged between the groove and the valve head for covering the valve rod. The float collar is simple in operation and stable in conversion, enables slurry to enter the casing more smoothly, can quicken the casing discharge speed to the greatest extent, and can reduce the impact force acted on the stratum to the greatest extent; and the automatic grouting type float collar can overcome the characteristics of time and labor wastes in manual grouting.

Description

technical field [0001] The invention belongs to the field of well cementing equipment, and in particular relates to an automatic grouting type floating hoop for casing under cementing. Background technique [0002] High-quality and high-efficiency casing running is an important issue that should be considered in cementing operations. The safe running of each layer of casing and tools determines the production efficiency of a well and even determines whether a well can produce normally. In order to ensure the safety of various strings and tools running into the well, keep the wellbore stable, and operate normally downhole, it is necessary to consider the internal and external pressure balance of the strings and tools and the return velocity of the mud in the borehole annulus. The current conventional solution is: in order to prevent the cement slurry from returning after the completion of the cementing, the lower part of the casing is equipped with a floating shoe. The conven...

AI Technical Summary

Problems solved by technology

The current conventional solution is: in order to prevent the cement slurry from returning after the completion of cementing, a floating hoop shoe is installed at the lower part of the casing. The conventional floating hoop shoe does not have the function of automatic grouting and must be run in with the casing. Manually pour mud into the casing from the wellhead to realize the dynamic balance of the pressure inside and outside the casing; under normal circumstances, it is stipulated that 20 to 40 casings must be filled with mud at one time. The casing running time is extended, and the automatic grouting hoop and floating shoes can make the mud flow into the casing automatically, and automatically realize the dynamic balance of the pressure inside and outside the casing

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