Tool Introduction:

Oil casing is a steel pipe used to support the wellbore of oil and gas wells, mainly used to support the wellbore during drilling and after completion, to ensure the normal operation of the entire oil well during the drilling process and after completion. The commonly used casing requires cleaning the inner wall of the casing before use, and the casing brush is a tool for cleaning the inner wall of the casing.

Structural features:

① The upper part of the upper joint of the tool is equipped with a lifting short section, which facilitates the tool's descent and extraction. The sealing ring at the lower part of the upper joint is sealed with the interior of the lower joint, creating a circulating space inside and outside the tool; The lower end of the upper joint and the upper end of the lower joint are respectively equipped with upper and lower guide blocks with spiral grooves. The parts (including the upper and lower guide blocks) located between the upper and lower guide blocks can rotate in the circumferential direction. When the tool is taken out and lowered into the well, the upper and lower guide blocks not only play a guiding role, but also scrape large debris on the inner wall of the casing, providing convenience for subsequent wire work;

② Under the restriction of the fixed ring, the steel brush body is locked in the body groove. When entering the casing, the steel brush body moves into the body groove, and the spring located between the steel brush body and the body groove is compressed. At the same time, the steel wire brush head is 360 ° attached to the inner wall of the casing. As long as the pipe is lifted or lowered, the steel brush body cleans the debris on the wellbore wall under the force of the spring, thereby achieving the cleaning of the inner wall of the casing, making the interior of the casing unobstructed, with high cleaning efficiency and fast speed; The plutonium wire brush is welded into one piece, which will not affect the cleaning operation due to wire detachment, and has strong operability;

③ When the tool encounters resistance during operation, it can be cut off by shaking the shear pin upwards through the pipe column. At this time, the groove and protrusion at the lower end of the lower guide block and the upper end of the lower joint cooperate with each other, and the middle part of the tool is fixed and no longer rotates. At the same time, the connection between the tool and the lower tool is released, and the tool can be safely lifted out. The operation is convenient and safe. The steel brush body can move within the body groove to adapt to different casings, with a wide range of applications.

Operation:

During the merging process, the parts located between the upper and lower guide blocks (including the upper and lower guide blocks) can rotate in a fixed direction. The upper and lower guide blocks not only play a guiding role, but also scrape large debris on the inner wall of the casing; At the same time, the compression spring of the steel brush body shrinks towards the body, and the steel wire brush head is in contact with the inner wall of the pipe. The steel wire, under the force of the spring, cleans the debris on the inner wall of the casing in a golden direction; When the tool encounters resistance during the operation, the shear pin is cut off by shaking upwards. At this time, the concave and convex parts at the lower end of the lower guide block and the upper end of the lower joint cooperate with each other, and the middle part of the tool is fixed and no longer rotates, which can safely lift out the tool.

Technical parameters: