US-20260126365-A1 - INTELLIGENT SIMULATION APPARATUS FOR MONITORING FLUID-ROCK DISSOLUTION OF CARBONATE ROCKS USING TEMPERATURE CONTROLLER

US20260126365A1US 20260126365 A1US20260126365 A1US 20260126365A1US-20260126365-A1

Abstract

An intelligent simulation apparatus for monitoring fluid-rock dissolution of carbonate rocks using a temperature controller is provided, including a reactor internally provided with a thermal insulation layer and a working chamber. A front side surface of the reactor is provided with a temperature controller. The working chamber is internally provided with an L-shaped liquid-gas accommodating chamber, a first reaction chamber, a heating chamber and a second reaction chamber. The L-shaped liquid-gas accommodating chamber is internally provided with a temperature sensor and a pressure sensor, which are electrically connected to the temperature controller. The heating chamber is internally provided with a heating wire. Two sides of each of the first reaction chamber and the second reaction chamber are slidably provided with a core holder for holding carbonate rock samples.

Inventors

Huaguo WEN
Jintong LIANG
FEI HUO
Yuhan HUANG
Wenli Xu
Yuntao LIAO

Assignees

CHENGDU UNIVERSITY OF TECHNOLOGY

Dates

Publication Date: 20260507
Application Date: 20251229
Priority Date: 20250103

Claims (8)

1 . An intelligent simulation apparatus for monitoring fluid-rock dissolution of carbonate rocks using a temperature controller, comprising: a reactor; wherein the reactor has a box-shaped structure; a top surface of the reactor is provided with a main feed inlet; a left side surface of the reactor is provided with an auxiliary feed inlet; and a front side surface of the reactor is provided with a window, a temperature controller and a heating button; the reactor is internally provided with a thermal insulation layer and a working chamber; the working chamber is internally provided with an L-shaped liquid-gas accommodating chamber, a first reaction chamber, a heating chamber and a second reaction chamber; the L-shaped liquid-gas accommodating chamber is internally provided with a temperature sensor and a pressure sensor; and the temperature sensor and the pressure sensor are electrically connected to the temperature controller; the first reaction chamber and the second reaction chamber are provided on two sides of the heating chamber, respectively; the heating chamber is internally provided with a heating wire; and the heating wire is electrically connected to the heating button; two sides of the first reaction chamber are each slidably provided with a first core holder for holding a first carbonate rock sample; and two sides of the second reaction chamber are each slidably provided with a second core holder for holding a second carbonate rock sample; right side surfaces of the first reaction chamber and the second reaction chamber are each provided with a return port; a bottom of the L-shaped liquid-gas accommodating chamber is provided with a first outlet, a second outlet and a third outlet; the first outlet is connected to a differential pressure sensor through a first pipeline to enable real-time and continuous measurement of liquid permeabilities of the first carbonate rock sample and the second carbonate rock sample during a fluid-rock reaction process; the differential pressure sensor has a measurement range of 0.1-10,000×10 −3 μm 2 ; the second outlet is connected to a sampler through a second pipeline; and the third outlet is connected to the return port through a third pipeline, a back-pressure pump and a fourth pipeline.
2 . The intelligent simulation apparatus of claim 1 , wherein the first core holder and the second reaction chamber each comprise a hydraulic rod and a piston connected to the hydraulic rod; and a cross-sectional dimension of the piston is the same as a cross-sectional dimension of each of the first reaction chamber and the second reaction chamber.
3 . The intelligent simulation apparatus of claim 1 , wherein the differential pressure sensor is electrically connected to the temperature controller; and the temperature controller is configured to display a measurement value of the differential pressure sensor in real time.
4 . The intelligent simulation apparatus of claim 1 , wherein the back-pressure pump is a plunger pump configured to drive fluid flow within the L-shaped liquid-gas accommodating chamber, so as to achieve fluid circulation.
5 . The intelligent simulation apparatus of claim 1 , further comprising: a fluid container; a dual-plunger pump; a pressure vessel; and a gas cylinder; wherein the fluid container is connected to the dual-plunger pump through a fifth pipeline; the dual-plunger pump is connected to the pressure vessel through a sixth pipeline; the gas cylinder is connected to the pressure vessel through a seventh pipeline; and the pressure vessel is connected to the main feed inlet through an eighth pipeline.
6 . The intelligent simulation apparatus of claim 5 , wherein the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline, the seventh pipeline and the eighth pipeline are each provided with a valve.
7 . The intelligent simulation apparatus of claim 5 , wherein the fluid container is filled with a fluid; a medium of the fluid is acetic acid from oilfield water at a concentration of 2 g/L, 4 g/L, 5 g/L, 6 g/L or 8 g/L; the fluid further comprises sodium sulfate, calcium chloride and magnesium chloride; and the gas cylinder is filled with carbon dioxide gas.
8 . The intelligent simulation apparatus of claim 1 , wherein the first reaction chamber and second reaction chamber each have a temperature ranging from room temperature to 400° C., and a pressure ranging from atmospheric pressure to 100 MPa; and a fluid flow rate inside the first reaction chamber and second reaction chamber is 0.1-10 mL/s.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of priority from Chinese Patent Application No. 202510010282.1, filed on Jan. 3, 2025. The content of the aforementioned application, including any intervening amendments made thereto, is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to dissolution simulation experiments, and more particularly to an intelligent simulation apparatus for monitoring fluid-rock dissolution of carbonate rocks using a temperature controller. BACKGROUND Dolostone is a key target in deep oil and gas exploration. Ancient dolostone strata in China have commonly undergone deep burial under high-temperature and high-pressure conditions and long-term superimposed diagenetic modification, during which multiple dissolution processes formed secondary pores and cavities, making them important oil and gas reservoir spaces. Oil and gas production practices further indicate that the degree of development of dissolution pores and cavities is one of the critical factors controlling hydrocarbon productivity. Therefore, elucidating the formation mechanisms and evolutionary processes of dissolution pores and cavities is of vital importance for predicting the distribution of high-quality dolostone reservoirs. The formation of dissolution pores and cavities involves two mechanisms. One mechanism is dissolution by meteoric water during the early diagenetic stage or an epidiagenetic stage, and the other mechanism is burial dissolution. Burial dissolution is characterized by its particularity, in that dissolution pores or cavities represent end products, and there are no corresponding diagenetic products that can be directly used to analyze the conditions under which the dissolution occurred. As a result, the formation mechanism of burial dissolution has long been a subject of controversy. Dissolution simulation experiments provide an effective research approach for investigating the conditions under which dissolution occurs and the dissolution processes themselves. Since the 1960s, scholars at home and abroad have conducted experimental studies to explore the dissolution mechanisms of carbonate rocks. With the discovery of numerous deeply buried carbonate oil and gas reservoirs, research on the dissolution mechanisms of carbonate rocks under high-temperature and high-pressure conditions has become a central focus of simulation experiments. Experimental conditions have accordingly evolved from low-temperature and low-pressure to high-temperature and high-pressure environments, and experimental samples used have gradually shifted from single-mineral samples such as calcite and dolomite to actual carbonate rock samples. These studies have contributed to a deeper geological understanding of dolostone dissolution responses under deep burial conditions. However, the controlling effect of dolomite crystal characteristics on dissolution processes and the formation mechanisms of dissolution pores and cavities remain unclear and require further investigation. SUMMARY An object of the disclosure is to provide an intelligent simulation apparatus for monitoring fluid-rock dissolution of carbonate rocks using a temperature controller, where grain-dominated dolostone extensively developed at depth is selected for high-temperature and high-pressure dissolution simulation experiments using an intelligent reactor, thereby investigating the formation and evolution processes of dolostone pores and clarifying dissolution amounts and effects under different diagenetic environments. Technical solutions of the present disclosure are described as follows. An intelligent simulation apparatus for monitoring fluid-rock dissolution of carbonate rocks using a temperature controller, comprising: a reactor;wherein the reactor has a box-shaped structure; a top surface of the reactor is provided with a main feed inlet; a left side surface of the reactor is provided with an auxiliary feed inlet; and a front side surface of the reactor is provided with a window, a temperature controller and a heating button;the reactor is internally provided with a thermal insulation layer and a working chamber; the working chamber is internally provided with an L-shaped liquid-gas accommodating chamber, a first reaction chamber, a heating chamber, and a second reaction chamber; the L-shaped liquid-gas accommodating chamber is internally provided with a temperature sensor and a pressure sensor; and the temperature sensor and the pressure sensor are electrically connected to the temperature controller;the first reaction chamber and the second reaction chamber are provided on two sides of the heating chamber, respectively; the heating chamber is internally provided with a heating wire; and the heating wire is electrically connected to the heating button;two sides of the first reaction chamber are each slidably provided with a first core holder for holding a first carbonate rock sample; a