A reusable steel core for multistage pre-shearing of chromium gel systems

Abstract

The invention provides a reusable steel core for multistage pre-shearing of a chromium gel system, comprising: a first core, a second core and N connected cores each having a central axis hole; the first The rock core has a boss structure on one end face; the second rock core has a groove structure on one end face; the connecting rock core has a boss structure on one end face and a groove structure on the other end face ; The first core, the connecting core and the second core are sequentially butted and buckled together through the boss structure and the groove structure, and the butt joint end faces are sealed; After being integrated, an airtight space is reserved at the interface between the boss structure and the groove structure; a screen is set in the airtight space; it solves the problem of pre-shearing the chromium gel system by using artificial sandstone cores indoors. The problems of non-repeatability of cutting time and core waste, as well as the inability to control the gelation time and gelation strength of the chromium gel system.

Description

technical field [0001] The invention relates to a rock core used for pre-shearing when evaluating the oil displacement effect of chromium gel. Background technique [0002] When using natural sandstone cores or artificial sandstone cores to evaluate the oil displacement effect of chromium gel in the laboratory, the conventional pre-shearing method is to carry out the oil displacement experiment after the chromium gel system passes through the artificial core with high permeability. The disadvantage is that it is non-repeatable, resulting in waste of core. Secondly, due to the difference in cementation degree and pore structure characteristics inside the artificial sandstone core, the shear rate is different, so that the consistency of the chromium gel after each pre-shearing in terms of apparent viscosity and molecular structure cannot be guaranteed, resulting in chromium The time, strength and depth of the gelation of the gel system are uncontrollable, which will cause pre...

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Problems solved by technology

[0003] In view of this, the present invention provides a reusable steel core for multi-stage pre-shearing of the chromium gel system, which solves the problem of unrepeatable pre-shearing of the chromium gel system by using artificial sandstone cores indoors And the problem of core waste, and because of the different pore structure characteristics of artificial cores, resulting in different shear rates, it is impossible to control the gelling time and gelling strength of the chromium gel system, resulting in premature gelation of the chromium gel system and serious problems End face effect, the problem that leads to the failure of the experiment

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