CO2 pressurization metering system and use method

Abstract

The invention discloses a CO2 pressurization metering system and a use method. The system comprises a liquid storage tank, a mixed liquid metering pump, a gas storage bottle, a refrigerator, a CO2 metering pump, a first piston container and a rock sample, wherein a water outlet of the liquid storage tank is connected with the upper part of the first piston container through the mixed liquid metering pump; the gas storage bottle is used for storing CO2 gas; a gas outlet of the gas storage bottle is connected with the lower part of the first piston container through the refrigerator and the CO2 metering pump sequentially; and a CO2 outlet in the lower part of the first piston container is connected with an inlet of the rock sample. The invention provides a stable experimental system with a CO2 anhydrous fracturing fluid injection function, and a use method.

Description

technical field [0001] The present invention relates to oil and gas development technology or CO 2 Relevant chemical industry, especially involving a CO 2 Boost metering system and method of use. Background technique [0002] Since it is very difficult to exploit low-permeability oil and gas reservoirs directly, through fracturing technology (including hydraulic fracturing, CO 2 Fracturing) has become the most effective means to transform oil and gas reservoirs. CO 2 The research on fracturing technology is a hot topic in the current industry, and the development of a 2 Fracturing, Improved CO 2 Fracturing (CO 2 The multi-functional fracturing simulation test system provides a stable supply of fracturing fluid, and the CO 2 It is particularly important to conduct better systematic research on fracturing initiation pressure and fracturing effect. [0003] The existing fracturing simulation test system in the industry has a single function, generally only capable of hy...

AI Technical Summary

Problems solved by technology

[0003] The existing fracturing simulation test system in the industry has a single function, generally only capable of hydraulic fracturing, not CO 2 Fracturing test simulation function

Individual fracturing simulation test systems contain CO 2 functionality for frac simulation, but while doing CO 2 When fracturing, there may be the following disadvantages: (1) There are defects in the design of the corresponding chemical reagent addition function. When mixing and outputting the fracturing fluid, the design is relatively simple in terms of pressure control, which leads to fracturing. The output pressure of the liquid is not stable enough, there may be pulses, which will affect the measurement effect and the measurement will be inaccurate

(2) Chemical reagents in CO 2 Insufficient concentration control and metering accuracy in fracturing fluid

(3) There are deficiencies in the stirring and mixing of fracturing fluid, the stirring is not sufficient, the rotation speed cannot be adjusted during stirring, or the stirrer is easily affected by chemical reagents or CO 2 Corrosion

(4) During the experiment, after the rock sample breaks, the output of fracturing fluid cannot be stopped immediately, resulting in waste of experimental samples and even a safety hazard in the experiment

In conclusion, the lack of comprehensive approaches to CO 2 Better control of the fracturing and fracturing process, which brings great inconvenience to the development of fracturing and fracturing experiments

Images