Double-acting compression type packer and use method thereof

Abstract

The invention relates to an underground packer with a double-compression function and a use method of the packer. According to a double-acting compression type packer, a center pipe of the packer is sleeved with an outer pipe, an outer step at the upper end of the center pipe corresponds to an inner step at the upper end of the outer pipe, the upper end of the outer pipe is sleeved by a rubber barrel sealing mechanism, an anchoring mechanism is arranged in the middle of the outer pipe in a sleeved mode and located under the rubber barrel sealing mechanism, the lower end of the outer pipe is sleeved with a hydraulic mechanism, the hydraulic mechanism is connected with the anchoring mechanism, the lower portion of the outer pipe is provided with square holes in the circumferential direction, a locking block is arranged in one square hole, the locking block radially extrudes out of an inner groove embedded in the hydraulic mechanism, a circumferential groove is formed in the lower portion of the locking block and in the outer periphery of the center pipe, and the positions, under the circumferential groove, of the center pipe and the outer pipe are connected in the axial direction through a shear pin. After the sealing action of the hydraulic mechanism is finished, a rubber barrel is compressed through mechanical force produced when a feeding pipe column presses downward, compressive deformation of the pipe column on the rubber barrel is locked through a locking ring, and therefore contact stress between the rubber barrel and a bush of the packer can be well improved. Therefore, the sealing performance of the packer is improved.

Description

technical field [0001] The invention relates to the technical field of downhole packers used in oil exploitation, in particular to an downhole packer with hydraulic and mechanical double compression functions. Background technique [0002] In well completion and oil production operations in the field of oil exploitation, downhole packers are often used to separate oil layers, seal oil casing annulus, and hang downhole tubing strings. According to the classification of packers, there is a compression type, such as Y441, Y445, Y341, etc., where "Y" means that the sealing rubber used on the packer is a compression type; the second The digit "4" means that the compression method of the packer rubber cylinder is hydraulically set packer, which is a commonly used packer setting method. [0003] Laboratory research and experiments show that after the packer is set, the contact stress between the radial direction of the rubber sleeve and the sealed casing is uneven in the axial dir...

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Problems solved by technology

[0004] Conventionally designed hydraulic packers, such as Y441 type, refer to Gu Kaizhao, Zhang Furen, Gu Guangming, etc., Y441B bi-directional anchoring packer structure analysis. Petroleum Machinery, 1997, 25 (6): 1~3, on the one hand, the packer can only be set by hydraulic pressure, the setting force is limited, and the setting force cannot be greatly increased; on the other hand, the packer setting Finally, with the passage of time and the influence of the sealing pressure, the contact stress between the rubber sleeve and the casing will gradually become uniform in the axial direction, the contact stress will also become smaller, and the sealing ability of the packer will also increase. Significantly reduced

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