Open mesh surface fixed sleeve

Abstract

The invention discloses an opening-net type surface fixing casing pipe. The opening-net type surface fixing casing pipe comprises an outer casing pipe arranged in the vertical direction, an inner casing pipe is coaxially arranged in the outer casing pipe, the outer wall of the inner casing pipe and the inner wall of the outer casing pipe are fixedly connected through four connecting rods, an annular cavity formed between the inner casing pipe and the outer casing pipe is divided into four right-angle circular arc cavities by the four connecting rods, and the right-angle circular arc cavities are separately provided with a set of top-pressure type sliding-relieving-hook external expansion mechanisms. The outer wall of the outer casing pipe is provided with a right-angle arc net plate, and the power output ends of the top-pressure type sliding-relieving-hook external expansion mechanisms pass through the outer casing pipe to be fixedly connected with the inner side surface of the right-angle arc net plate. When the opening-net type surface fixing casing pipe is subjected to cementing and well cementing, the ability of an external cement ring of the surface fixing casing pipe and thesurface fixing casing pipe to resist the external load is increased by combining cement and the right-angle arc net plate and the space between the right-angle arc net plate and the outer casing pipe,changes of the external load can be effectively resisted, the surface fixing casing pipe can be effectively protected from being crushed and destroyed.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well exploitation, and in particular relates to an open-net type surface fixed casing. Background technique [0002] The formation of oil and gas reservoirs in many petroleum basins in the world is related to salt-gypsum layers. The salt-gypsum layer has rheological characteristics, and is the most dangerous formation for the casing body. It is an extremely unstable formation, and its creep produces plastic flow. The formation around the wellbore wall is squeezed toward the center of the wellbore, and the overlying pressure of the formation will act partially or completely. On the bushing body, considerable extrusion loads are exerted on the bushing body. In areas with active tectonic activities, tectonic stress far greater than the overlying pressure acts on the casing body. And as the depth increases, the pressure of the overlying strata also increases, and the actual external extrusion fo...

AI Technical Summary

Problems solved by technology

The damage of the casing body causes serious production decline, causing direct economic losses to the oil field, and repairing the damaged casing body requires a large amount of new capital investment

In addition, the damage of the casing body destroys the normal injection-production well pattern, resulting in a huge waste of oil and gas resources, which seriously interferes with the normal operation decision-making

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