Diagenesis simulation experimental apparatus and method

Abstract

The invention relates to a diagenesis simulation experimental apparatus and method. The diagenesis simulation experimental apparatus comprises a rock core clamping mechanism, a heating mechanism, a gas porosity and permeability measurement process, a liquid injection and liquid permeability test process, an automatic continuous outlet-fluid metering and sampling mechanism, a burden pressure boost control mechanism, a fluid physical property detection mechanism and a data acquisition-calculation and automatic control mechanism, wherein, the inlet and outlet of the rock core clamping mechanism are respectively connected with the gas porosity and permeability measurement process and the liquid injection and liquid permeability test process; the heating mechanism is sheathed at the periphery of the rock core clamping mechanism, and the burden pressure injection port of the rock core clamping mechanism is connected with the burden pressure boost control mechanism; the outlet of the liquid injection and liquid permeability test process is connected on the automatic continuous outlet-fluid metering and sampling mechanism; the fluid physical property detection mechanism detects a fluid sample of the automatic continuous outlet-fluid metering and sampling mechanism; and the data acquisition-calculation and automatic control mechanism acquires, records, stores and calculates temperature, pressure and flow rate in an experiment and meanwhile controls operation of the corresponding solenoid valve and the automatic continuous outlet-fluid metering and sampling mechanism according to the experimental status.

Description

technical field [0001] The present invention relates to a method and device for diagenesis simulation experiments in petroleum, geology and exploration industries, in particular to a simulation experiment method and device for studying the effects of fluid, pressure, temperature and other factors on the physical property changes in the rock formation process . Background technique [0002] Since J.Wather first proposed the concept of diagenesis in 1893, the research on diagenesis has been systematic and in-depth. In recent years, many domestic scholars have engaged in research in this area and have made great progress. With the increasing depth, precision and difficulty of oil and gas exploration and development, people began to systematically summarize the general laws of diagenesis, predict favorable pore development zones, help to find hidden oil and gas reservoirs, and gradually combine with geophysical technology to make diagenesis Research plays a bigger role in expl...

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Problems solved by technology

[0003] Compared with theoretical studies, there are relatively few laboratory experimental studies on diagenesis, and there are fewer relatively complete instruments dedicated to the study of diagenesis, which also limits the progress of laboratory experimental studies.

However, the few existing instruments are incomplete in function. For example, the diagenesis tester produced by the instrument factory of China University of Petroleum mainly focuses on the research of compaction, while the diagenesis simulation test developed by Sinopec Petroleum Exploration and Development Research Institute Wuxi Installation focuses on dynamic fluid effects on diagenesis

The anti-corrosion performance of the selected materials is not ideal. Both instruments use alloy steel materials and surface treatment, which is difficult to adapt to acid and alkali corrosion. In addition, the technical indicators of the instruments are relatively low, and the highest temperature and pressure indicators of the existing instruments are respectively Yes: 250°C and 50MPa are not enough to fully meet the requirements of the test

The main reason for these problems lies in the core part of the instrument, the core holder. The existing instrument is still the Hastelloy core holder for conventional flow experiments. It uses a rubber cylinder with hydraulic pressure to hold the core. Due to the rubber The highest temperature resistance is 250°C (short-term use), so the maximum test temperature of the instrument is limited. The rubber will soften at high temperature, and the softened rubber will creep under high pressure, so the maximum test pressure of the instrument is limited.

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