An infinite sliding sleeve and its process method

Abstract

The invention provides a grading-limitation-free slide sleeve and a process method, and belongs to the technical field of an oil field production well fracturing and acidification grading device. According to a well entering state, a connecting body is connected under a coupling; a displacement slide sleeve is arranged in the body; the lower end of the body is connected with a lower joint; three long round holes are formed in the body; a plurality of discontinuous annular grooves are formed in positions, near the lower part, inside the body; the displacement slide sleeve is arranged in the body during the well entering; the upper end of the outer part of the displacement slide sleeve is provided with a first O-shaped sealing ring; the lower end of the outer part of the displacement slide sleeve is provided with a second O-shaped sealing ring; a discontinuous annular groove is formed under the second O-shaped sealing ring arranged at the lower part of the displacement slide sleeve; the displacement slide sleeve is fixed with the body through a slide sleeve shearing nail; a cutting groove is formed in the lower end part of the inner diameter of the displacement slide sleeve, so that a tool can be conveniently used for rotating the displacement slide sleeve in a direction along the circumference; a lock ring is arranged at the outer part of the lower end of the displacement slide sleeve; an annular groove used for grading is formed in a position, near the upper part, of the inner diameter of the displacement slide sleeve; and during the grading, only the axial length of the annular groove is changed, and other dimensions are not changed.

Description

technical field [0001] The invention relates to an infinitely-stage sliding sleeve and a process method, and belongs to the technical field of fracturing and acidizing of production wells in oil fields. Background technique [0002] In order to maximize the production capacity of oilfield production wells and maintain the production of production wells, technical measures such as fracturing and acidizing will be carried out on some wells during the production cycle of oil and gas wells. Since the production layers are buried hundreds to several kilometers The depth of the strata is divided into many layers, affected by various factors, there are inevitable differences between layers, which is what we usually call the contradiction between layers. In order to maximize the potential of each layer, it is necessary to treat each single layer as much as possible. The previous classification method mainly adopts the ball seat type, that is, the inner diameter of the ball seat beco...

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Problems solved by technology

[0005] Disadvantages of prior art 1: due to the classification method of ball seat classification, the grades that can be separated in oil pipes with a certain inner diameter are limited, and because the inner meridian of the ball seat becomes smaller and smaller from top to bottom, acidification is carried out at large displacements During the fracturing process, a large throttling pressure difference will be generated, which will inevitably increase the working pressure of the plunger pump of the operating vehicle group and increase the erosion of the tools. At the same time, it will also limit the increase in the operation scale and make it difficult to fully develop the production zone. potential

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