Core holder

Abstract

The invention discloses a core holder, which includes: a nonmetal high pressure resistant cylinder; a core component disposed in the cylinder; a left mandrel end seat assembly and a right mandrel end seat assembly that are respectively disposed at the left end and right end of the cylinder and are connected with the left end and the right end of the core component; a ring crush cavity formed by the cylinder, the core component, and the left mandrel end seat assembly and the right mandrel end seat assembly; and a left connecting sleeve and a right connecting sleeve, with the left connecting sleeve being used for connecting the cylinder left end and the left mandrel end seat assembly, and the right connecting sleeve being used for connecting the cylinder right end and the right mandrel end seat assembly. The core holder provided by the invention is difficult to leak, can withstand higher pressure, and can better meet the experimental requirements, thereby being more conducive to oil-gas exploration and development.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a rock core holder. Background technique [0002] The application of nuclear magnetic resonance technology in petroleum exploration and development mainly focuses on the analysis and evaluation of reservoir structure, the distribution characteristics of fluid in oil and gas reservoir rocks, and the study of seepage mechanism, etc. These research work are carried out visually by using nuclear magnetic resonance technology. If it is to be carried out under high temperature and high pressure conditions, it is necessary to develop and design a nuclear magnetic resonance core holder specially used for oil exploration and development research. The core holder is a core experimental device used to simulate the high temperature and high pressure conditions of the formation. The core NMR experiment is to put the core containing oil and water into the radio frequency...

AI Technical Summary

Problems solved by technology

From the perspective of effect, during the use of the first type of core holder, the RF coil is under high temperature and high pressure, and the resonance frequency of the RF coil parameters will drift, and the resonance frequency parameters need to be adjusted frequently, which affects the stability of the experimental results.

Secondly, since the sealing end cover is made of fluoroplastic, pressure leakage will occur when the ring pressure rises at the seal of the ring pressure oil inlet pipe and oil discharge pipe, and the displacement oil inlet pipe and oil outlet pipe on the sealing end cover.

During the use of the second type of core holder, polyimide or polyimide and carbon fiber are generally used in engineering plastics mixed in a certain proportion, so the holder cylinder and the two ends of the head Or the seal of the plug and the seal of the confining pressure inlet and outlet on the head or plug and the seal of the displacement inlet and outlet, when the confining pressure rises, pressure leakage will occur

In general, the existing core holders have low pressure resistance and cannot meet the requirements of temperature and pressure test experiments for simulating tight reservoirs.

Images