CN204719021U - A kind of novel core holding unit - Google Patents

Abstract

The utility model relates to novel core holding unit, comprises cylindrical shell, sample hose, plug, can heat sleeve pipe, quickly cooling device, it is characterized in that placing sample hose in cylindrical shell, installs sleeve pipe of can heating outside cylindrical shell additional; There is screw thread at cylindrical shell two ends, can with the screw thread compact siro spinning technology of plug; Quickly cooling device is installed on the pipeline of displacement endpiece; Its advantage is that utilization can replace constant temperature oven by heating apparatus, breaches heat in the past and drives the bottleneck that in displacement test, oven heat is slow and heating temperature range is narrow; The pipeline of displacement endpiece installs quickly cooling device additional, decreases the length of cooling pipeline, improve the accuracy of metering.

Description

A new type of core holder

technical field

The utility model belongs to the technical field of test instruments for testing the physical properties of seepage mechanics, in particular to a novel core holder which can heat the core in the displacement test and quickly cool down the displaced fluid.

Background technique

my country's heavy oil resources are extremely rich, and the distribution range is very wide. Therefore, the mining technology of heavy oil reservoirs has attracted widespread attention from all over the world. Heavy oil mining mainly relies on thermal extraction, such as steam stimulation, continuous steam injection and hot water injection methods. In order to design and optimize thermal drive parameters in actual production, laboratory experiments are needed to measure the oil displacement efficiency during thermal drive.

At present, the commonly used core holders usually use the thermostat heating method to maintain high temperature during the high-temperature thermal drive oil displacement efficiency test. The heating temperature range is narrow and cannot reach the temperature required for ultra-high temperature displacement; and the thermostat has a large heating space. , Often the equipment that does not need to be heated in the experiment is also heated together, resulting in a waste of energy. On the other hand, the fluid displaced by commonly used core holders during thermal drive tests is mostly cooled by a cold water bath in a long pipeline, and the displacement fluid will be occupied in the pipeline. When the amount of displacement fluid in the experiment is small, the pipeline The fluid occupied in the medium will lead to inaccurate fluid metering, which will cause a large error in the calculation of oil displacement efficiency. This new type of core holder overcomes the above disadvantages. By installing a heating device on the periphery of the holder, only the core displacement part is heated, and a rapid cooling device is installed on the outlet pipeline, which can be achieved by using a shorter pipeline. The rapid cooling of the displacement fluid can be realized, so the amount of displaced fluid can be accurately measured, which provides an experimental basis for the determination of the displacement efficiency of high-temperature thermal flooding.

Contents of the invention

The purpose of the utility model is to accurately measure the fluid flow rate at the outlet end in the high temperature thermal drive oil displacement efficiency test, and provide an experimental basis for the test of the high temperature thermal drive oil displacement efficiency test.

The technical scheme adopted in the utility model is as follows:

The novel core holder includes: a cylinder body, a sample tube, a plug, a heatable casing, and a rapid cooling device. A sample tube is placed inside the cylinder, and a heatable sleeve is installed on the outside of the cylinder. There are threads at both ends of the cylinder, which can be tightly connected with the threads of the plug, and a sealing ring is used to seal the cylinder. The rapid cooling device is installed at the displacement outlet. end of the pipeline. The pressure resistance of the cylinder can reach 120MPa; the sample tube is made of perfluororubber and is used to place experimental samples. The sample tube can accommodate a rock core with a diameter of 25mm and a length of 80mm. The plug is tightly connected with the threads at both ends of the cylinder through threads, and the two ends of the cylinder are sealed by the sealing ring. There is a passage for displacement fluid in the plug, and the fluid passage is connected to the pressure sensor. The heatable sleeve is installed on the outside of the cylinder, and the maximum temperature can reach 200°C. It is cooled by fluid water. The fluid water flows from one end of the heating sleeve to the other end, and cools down the heatable sleeve after the experiment. . The rapid cooling device is installed on the pipeline at the outlet of the displacement, so that the rapid cooling of the displacement fluid can be realized without increasing the length of the pipeline, and the amount of displaced fluid can be accurately measured, providing an experiment for the determination of the high-temperature thermal displacement oil displacement efficiency. Base.

The utility model has the advantages of breaking through the bottleneck of slow heating of the constant temperature box and narrow heating temperature range in the previous hot water displacement experiments, and only heating the core displacement part, avoiding energy waste; skillfully using the rapid cooling device, the displacement fluid Cool down quickly, reduce the length of the cooling pipeline, and improve the accuracy of measurement.

Description of drawings

Fig. 1 is a schematic diagram of the main structure of the utility model.

In the figure: 1. Cylinder body, 2. Sample tube, 3. Plug, 4. Heatable sleeve, 5. Rapid cooling device.

Detailed ways

In order to make the purpose of the present invention, technical solutions and advantages clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific examples: Body 1, sample tube 2, plug 3, heatable sleeve 4, rapid cooling device 5.

It is characterized in that: the sample tube 2 is placed inside the cylinder 1, and a heatable sleeve 4 is installed on the outside of the cylinder 1; the threads at both ends of the cylinder 1 are closely matched with the threads of the plug 3, and the cylinder 1 is sealed with a sealing ring, Cylinder 1 can withstand pressure up to 120MPa; sample tube 2 is made of perfluororubber and is used to place experimental samples. The sample tube 2 can accommodate rock cores with a diameter of 25mm and a length of 80mm; plug 3 is connected to the cylinder through threads 1 Both ends are threaded tightly connected; the heating sleeve 4 is installed on the outside of the cylinder 1, and the maximum temperature can reach 200°C. It is cooled by fluid water, and the fluid water flows from one end of the heating sleeve 4 to the other end. After the experiment, the temperature of the heatable casing 4 is lowered; the rapid cooling device 5 is installed on the pipeline at the outlet end of the displacement.

The novel rock core holder mainly includes the following steps when carrying out experiments.

(1) Preparatory work: the core is vacuumed and saturated with crude oil.

(2) Install the core saturated with crude oil in the core holder, and apply confining pressure to clamp the core.

(3) Set the heating temperature, turn on the heating switch, and wait for the temperature to reach the set temperature.

(4) Open the rapid cooling device at the outlet end, and open the constant flow pump pipeline for thermal drive test.

(5) The pipeline at the outlet end is connected to the measuring cylinder, which is placed on a precision electronic balance, and the increment of fluid mass and volume is weighed for a period of time, and the oil-water volume is deduced from the oil-water density difference to calculate the oil displacement efficiency.

(6) Repeat steps 2 to 5 to carry out displacement experiments at different high temperatures.

(7) At the end of the experiment, turn off the switch of the heatable casing and the rapid cooling device.

(8) When the temperature of the heatable casing drops to normal temperature, release the confining pressure and take out the experimental core.

By calibrating different displacement temperatures and corresponding oil displacement efficiencies on the chart, the relationship curve between displacement temperature and oil displacement efficiency can be accurately described.

Claims (4)

1. A new type of core holder, comprising a cylinder (1), a sample tube (2), a plug (3), a heatable sleeve (4), and a rapid cooling device (5); it is characterized in that the cylinder The sample tube (2) is placed inside (1), and a heatable sleeve (4) is installed on the outside of the cylinder (1); there are threads at both ends of the cylinder (1), which can be tightly connected with the threads of the plug (3), A sealing ring is used to seal the cylinder body (1), and a rapid cooling device (5) is installed on the pipeline at the displacement outlet end. 2. A new type of rock core holder according to claim 1, characterized in that the cylinder body (1) can withstand pressure up to 120MPa; the sample tube (2) is made of perfluorinated rubber and is used to place experimental samples, samples The pipe (2) can accommodate a rock core with a diameter of 25mm and a length of 80mm. 3. A new type of core holder according to claim 1, characterized in that the plug (3) is tightly connected with the threads at both ends of the cylinder (1) through threads, and the cylinder (1) is sealed by a sealing ring , there is a channel for displacing fluid in the plug (3), wherein the fluid channel is connected to the pressure sensor. 4. A new type of core holder according to claim 1, characterized in that the heatable casing (4) is installed on the outside of the cylinder (1), the maximum temperature can reach 200°C, and it is cooled by fluid water. Fluid water flows into the other end from one end of the heating sleeve (4), and cools down the heatable sleeve (4) after the experiment is finished.