Small diameter double seal layered steam injection packer

Abstract

The invention relates to a small-diameter dual-seal layered steam injection packer which comprises a central pipe, a hydraulic cylinder jacket, upper and lower rubber cylinders and upper and lower conical expansion bodies, wherein the upper end and the lower end of the central pipe are connected with upper and lower joints respectively; the hydraulic cylinder jacket is provided with a jacket main body, an upper extending block and a lower extending block; upper and lower hydraulic cylinders are formed on the inner sides of the upper extending block and the lower extending block respectively; the upper rubber cylinder is connected to the upper part on the outer side of the central pipe and positioned above the upper hydraulic cylinder; the upper end of the upper rubber cylinder is connected with an upper pressing cap; a conical space is formed on the inner side of the lower end of the upper rubber cylinder; the lower rubber cylinder is fixed at the lower part on the outer side of the central pipe and positioned below the lower hydraulic cylinder; the lower end of the lower rubber cylinder is connected with a lower pressing cap; a conical space is formed on the inner side of the upper end of the lower rubber cylinder; the upper conical expansion body and the lower conical expansion body are arranged on the outer side of the central pipe respectively; the lower end of the upper conical expansion body is connected to the upper hydraulic cylinder; the upper end of the upper conical expansion body is conical and connected into the conical space of the upper rubber cylinder; the upper end of the lower conical expansion body is connected to the lower hydraulic cylinder; and the lower end of the lower conical expansion body is connected into the conical space of the lower rubber cylinder.

Description

technical field [0001] The invention belongs to an oil well packer in the field of oil production engineering, in particular to a small-diameter double-seal layered steam injection packer used in a variable well for thermal recovery heavy oil casing. Background technique [0002] With the continuous deepening of oilfield development and the increase of huff and puff cycles in heavy oil thermal recovery wells, the phenomenon of casing deformation and diameter shrinkage has become increasingly prominent. Due to casing deformation and shrinkage, conventional thermal recovery packers (minimum outer diameter ≥ φ150mm) cannot pass through the casing transformation section (casing transformation positions are mostly in the middle and upper parts of the oil layer), making it impossible to implement layered steam injection measures in some oil wells , leading to uneven vertical production of oil layers and poor huff and puff effects, which seriously affect the recovery of such oil we...

AI Technical Summary

Problems solved by technology

Due to casing deformation and diameter shrinkage, conventional thermal recovery packers (minimum outer diameter ≥ φ150mm) cannot pass through the casing transformation section (casing transformation positions are mostly in the middle and upper parts of the oil layer), making it impossible to implement layered steam injection measures in some oil wells , resulting in uneven vertical production of oil layers and poor huff and puff effects, seriously affecting the recovery of this type of oil wells

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