Screen pipe completed well gel-breaking tester

Abstract

The invention provides a high-temperature screen pipe completed well gel-breaking tester which comprises a well wall outer barrel 8 and a screen pipe inner barrel 11 sheathed in the well wall outer barrel, wherein a cavity between the well wall outer barrel and the screen pipe inner barrel is an external circulation cavity 9; the top and the bottom of the well wall outer barrel are respectively provided with an upper cover 19 of the well wall outer barrel and a lower cover 18 of the well wall outer barrel; the top and the bottom of the screen pipe inner barrel are respectively provided with an upper cover 2 of the screen pipe inner barrel and a lower cover 15 of the screen pipe inner barrel; the upper cover 19 of the well wall outer barrel is in close fit with the upper cover 2 of the screen pipe outer barrel, and the upper cover 2 of the screen pipe outer barrel is provided with a quick-change connector 1 communicated with the inner cavity of the screen pipe inner barrel 11; and the side wall of the screen pipe inner barrel 11 is provided with at least one screen 12. The tester of the invention can simulate the underground plugging and filtration conditions of the screen caused by high temperature, high pressure and drilling fluid and the gel-breaking and removing conditions of screen bulkheads caused by the gel-breaking liquid, and can exactly determine the gel-breaking time and determine filtering the velocity of a screen filer cake after determining the gel-breaking.

Description

technical field [0001] The invention relates to a screen pipe completion gel breaking tester, which belongs to the simulation experiment equipment in the field of petroleum exploitation. Background technique [0002] At present, during the drilling and completion of unconsolidated sandstone, the drilling fluid forms a dense mud cake at the downhole sand control screen. Due to the extremely low permeability of the mud cake plugging layer, the outflow of crude oil will inevitably slow down, which is not conducive to oil well production. . Therefore, before the oil well is put into production, it is necessary to effectively remove the mud cake blockage at the screen of the screen. The gel-breaking fluid is the main reagent for removing mud cake plugging, and timely understanding of the gel-breaking fluid's removal of mud cake plugging has strong practical significance for improving oil well production efficiency. [0003] So far, there are few instruments for simulating the r...

AI Technical Summary

Problems solved by technology

[0003] So far, there are few instruments for simulating the removal of sand control screen mud cake clogging. In laboratory experiments, the mud cake is generally pressed on filter paper or core, and soaked in the gel breaking fluid at the reservoir temperature to simulate the removal of the mud cake. , can not simulate the removal of screen blockage by simulation under high pressure on site

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