Screen pipe with temporary plugging function

Abstract

The invention discloses a screen pipe with the temporary plugging function, comprising a central pipe with a plurality of through holes on the tube wall and an external filter sleeve with a filter layer. The screen pipe is characterized in that plugs are arranged on the through holes in a matched manner; the through holes are arranged according to certain density and law and are connected with the drillable cylindrical plugs by threads, welding or inlaying; the external cylindrical surfaces of the cylinders are provided with connection features to be matched with the through holes; and the plugs are provided with blind holes toward the end face of the center pipe. The screen pipe is mainly applied in the process of open hole screen pipe completion, can play a good protection role in the filter layer of the screen pipe in the process of entering the well by using the plugs to avoid filter cakes from forming on the surface of the filter layer to plug the screen pipe, and simultaneously can change (simplify) the existing completion procedures so as to achieve near-perfect productive efficiency.

Description

technical field [0001] The invention belongs to the field of petroleum equipment, in particular to a screen pipe with a temporary blocking function. Background technique [0002] Sand control screens and liners are widely used in the field of oil and gas field development, especially in the development of horizontal wells. [0003] Sand control screens and liners mainly play the following roles in the development of oil and gas wells: [0004] 1. Provide channels for oil and gas to enter the wellbore; [0005] 2. For sand production wells, it acts as a filter, which can effectively prevent various hazards caused by formation sand production, such as corrosion of downhole equipment, sand accumulation in ground manifolds and oil storage tanks, reduced production, and even scrapping oil and gas wells; [0006] 3. For oil and gas wells that do not produce sand, it mainly plays the role of maintaining the stability of the wellbore and preventing debris from entering the wellbor...

AI Technical Summary

Problems solved by technology

[0011] During the completion of oil and gas wells, the screen is usually run in first, and the original mud (water, solid particles, additives, etc.) in the wellbore will enter through the filter medium of the screen under the action of the internal and external pressure difference. In the screen, as the screen is lowered to the designated position, mud cake will form on the surface of the screen filter medium, and particle deposits will form inside the filter medium, resulting in a decrease in the permeability of the screen and directly affecting the production of oil and gas wells

[0012] In order to solve the above problems, mud replacement and pickling operations are usually carried out after the well completion operation to decontaminate the mud and mud cake, but these measures cannot completely restore the filtering performance of the screen, and at the same time increase the construction process and operating costs, and prolong the completion time. In the operation cycle, due to the loading and unloading of pulp replacement and pickling operation tools, the operation risk is also increased

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