Leaking stoppage barrel and leaking stoppage slurry combined leaking stoppage method specific to fractured formation

Abstract

The invention provides a leaking stoppage barrel and leaking stoppage slurry combined leaking stoppage method specific to a fractured formation. The method comprises the following steps that whether leakage is fractured leakage or not is judged, and the position of a leakage layer is determined; a leaking stoppage barrel is machined; the leaking stoppage barrel is driven into the position below the drilling fluid level in a well; when the leaking stoppage barrel is driven into the upper portion of a leakage layer well section, water ways are filled in the position 30-50 m away from the leakage layer, and filler in the barrel is ejected and released by starting a pump; leaking stoppage slurry is driven into a drill stem, and substitutive slurry is in place; and the leaking stoppage slurry is driven into the drill stem, so that the fillers and the leaking stoppage slurry enter the leakage layer, and leaking stoppage is achieved. According to the leaking stoppage barrel and leaking stoppage slurry combined leaking stoppage method specific to the fractured formation, the leaking stoppage measurement and technical problems in vicious well leakage are solved, especially for the fractured formation leakage, the leaking stoppage method is effective, and the well leakage of the fractured formation is well solved.

Description

technical field [0001] The invention belongs to the field of complicated treatment of drilling accidents, and in particular relates to a plugging cylinder and a plugging mud combined plugging method for fractured formations. Background technique [0002] In the current drilling process, due to the complex formation conditions, when there are large-scale fractures in the formation, malignant lost circulation is very likely to occur, resulting in the rapid reduction of drilling fluid in the wellbore until it is lost, affecting normal drilling, causing wellbore instability, Induce formation fluid to pour into the wellbore and blow out. Therefore, attention must be paid to the leakage of fractured formations, and attention should be paid to the plugging operation of fractured formations. [0003] The purpose of the plugging method for fractured formation is to plug the formation fractures, thereby reducing the loss of drilling fluid and eliminating the risk of lost circulation....

AI Technical Summary

Problems solved by technology

At present, many types of plugging muds have been developed for fractured formations, but due to the different sizes of fractures, it is difficult to eliminate lost circulation with a single plugging mud in actual operation

[0004] This method is derived from the actual plugging operation on site. After the crack leakage occurs, the plugging mud is used for continuous plugging for many times, but no effect has been achieved.

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