Rock core gripper for simulating formation multiple stress field coupling action

Abstract

This invention discloses a rock core clamper, which can distinguish the horizontal stress and vertical stress in the stratum rock and mock the stratum stress status in reality and can be used to measure the porosity and penetration degree of the rock and their varying rule with the stress. The rock core clamper mocks couple functions with multiple stress fields, which comprises flow penetrate board, pressure guiding block, upper cover, base socket and hollow rubber ring. And it has two set pressure systems and the pressure exerted on the rock core through the pressure-guiding block makes the rock core generate vertical stress and the hollow rubber ring is filled with flow to press the rock core and makes the rock core generate horizontal stress.

Description

technical field [0001] The invention relates to a device and method for analyzing and testing rock physical properties, in particular to a test device and method for measuring rock porosity and permeability variations under simulated stratum stress conditions, which are applied in petroleum exploration and development industries. Background technique [0002] In the process of geological exploration and production and development of petroleum and natural gas, it is necessary to use physical simulation methods to measure the porosity and permeability of formation rocks and their variations with stress. In the formation, the porosity and permeability of the rock are determined by the size and shape of the pore structure, and are affected by the stress state of the rock. see figure 1 , the stress state of the rock in the formation can be expressed by the horizontal stress σ h and the vertical stress σ v The horizontal stress is determined by the horizontal pressure on the ro...

AI Technical Summary

Problems solved by technology

No matter from the static point of view or from the dynamic point of view, the conventional core holder and its improved type cannot distinguish the horizontal stress and vertical stress in the formation rock, so the formation stress field and its changes cannot be simulated

[0005] Since conventional core holders and their improved models cannot truly simulate the formation stress field and its changes, the use of these core holders cannot accurately measure the porosity and permeability under formation conditions and their variation laws

In view of the fact that there is no patent technology disclosure of related test devices that can truly distinguish the horizontal stress and vertical stress in the formation rock, and truly simulate the formation stress field and its changes, it is necessary to invent a new type of test device for the analysis of the physical properties of formation cores. Core holder, this new type of core holder requires the ability to distinguish the horizontal stress and vertical stress of the rock in the formation rock, truly simulate the formation stress field and its changes, and reliably measure the porosity and permeability of rock pores under formation conditions rate and their law of pressure variation

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