Multilevel interlinked shear seat-sealing ball

Abstract

The invention provides a new type of "multi-stage serial shearing seat sealing ball" device, comprising: an upper hollow seat sealing ball, an upper hollow pressure transmission connecting rod; a middle hollow seat sealing ball, a middle hollow pressure transmission connecting rod; a lower solid seat a block ball; and a set of shear pins. The present invention is put into the ground; it falls downhole along with the oil pipe or casing, and reaches the position of the downhole sliding sleeve. In highly deviated well sections or horizontal well sections: pump the completion fluid or mud through the surface, and push the "multi-stage serial shear seat seal ball" to the position of the downhole sliding sleeve; then, pressurize the ground to open the downhole sliding sleeve . No need for steel wire work; no need for cable feeding; no need for coiled tubing work; no need for hydraulic control pipeline work outside the oil pipe, and the "multi-stage chain shear seat seal ball" can be used to continuously open or close multiple sliding sleeves in one trip, saving rig time. It can also replace the highly deviated well sections and horizontal well sections that cannot be reached by steel wires and cables, and can open or close multiple sliding sleeves continuously, saving costs. After opening or closing multiple sliding sleeves, the oil and gas in the tubing can be produced normally, which saves costs; there is no limit to the depth of entry and the flow rate of oil and gas wells.

Description

technical field [0001] The invention relates to the technical fields of oil and gas well completion operations, fracturing operations and cementing downhole tools, in particular to a multi-stage serial shearing seat sealing ball device. Background technique [0002] For more than 100 years, well completion (well completion) is the process of connecting the bottom of the well with the oil layer in a certain structure after the open-hole well is drilled to the designed depth in oil production. The beginning of the project is closely connected with the subsequent oil recovery, water injection and the development of the entire oil and gas field. The quality of oil well completion directly affects the production capacity and economic life of the oil well, and even relates to whether the entire oil field can be developed reasonably. [0003] On the completion strings widely used in modern times, in order to effectively mine in layers and increase production, sliding sleeves must ...

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Problems solved by technology

[0008] At the same time, due to the limitation of the lifting capacity of the operating equipment and the signal disp

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