CN202256109U - Rock core self-absorption experimental apparatus for simulating formation conditions - Google Patents

Abstract

The utility model provides a rock core self-priming experiment device capable of simulating formation temperature and formation pressure conditions and improving the accuracy of evaluation results for simulating formation conditions. The technical solution of the utility model is: comprising a rock core holder, a semi-sealed sample container, a lifting platform, a constant temperature box, a rock core holder fixing bracket, and a data acquisition system. The core holder is provided with a pressure filling port, and the filling port is externally connected with a through valve and a pressure stabilizing pump. A gas flowmeter is connected to the pipeline drawn from the upper end of the core holder, and the gas flowmeter is connected to the data acquisition system. Compared with the prior art, the utility model has the following advantages: it can simulate different formation temperature and pressure conditions to carry out self-absorption evaluation experiments of low-permeability rock cores, the operation is simple and convenient, data is automatically collected, and the accuracy rate is high, which can be used for the exploration of low-permeability oil and gas fields Development provides reliable data.

Description

Core self-priming experimental device for simulating formation conditions

technical field

The utility model relates to a low-permeability rock core self-priming evaluation experimental device for simulating formation temperature and pressure in a laboratory, in particular to a rock core self-priming experimental device for simulating formation conditions.

Background technique

Low-permeability reservoirs are characterized by high muddy cement content, high water saturation, high capillary pressure, strong water sensitivity, small pore throats, poor permeability, complex structure, serious heterogeneity, and often accompanied by natural fractures. During the development of low-permeability oil and gas reservoirs, when the initial water saturation is lower than the irreducible water saturation, there is excess capillary pressure in the reservoir, and when foreign fluid enters, it is easily sucked into the capillary pores, resulting in water lock. damage. Self-priming is a form of water lock damage. At present, there are few experimental devices used for self-priming evaluation in the literature, and most of them use self-made simple experimental devices for evaluation. Moreover, the existing experimental equipment cannot simulate real formation conditions (temperature and pressure), and the method of weighing the change of core mass with a balance has large errors. These factors will lead to the inaccuracy of the self-absorption evaluation experiment.

Discussed a kind of experimental device of measuring rock core self-priming ability in the document " the indoor research of biosurfactant dehydration lock ", this device is the preliminary research achievement of the team of the present invention, self-priming experimental device described in this document can simulate formation temperature, but Formation pressure cannot be simulated; the device evaluates the self-absorption capacity of the core by collecting the quality change of the core, and there are certain errors in the experiment process.

A capillary self-priming experimental device is discussed in the document "Research on Damage Mechanism of Tight Carbonate Reservoirs in Moxi Gas Field in Central Sichuan". The self-priming ability of the core is also evaluated by collecting the quality change of the core, and there are certain errors in the experimental process.

Utility model content

The purpose of this utility model is to provide a kind of core self-priming experimental device that can simulate formation temperature and formation pressure conditions and improve the accuracy of evaluation results for the shortcomings of the existing rock core self-priming experiment evaluation device. .

The technical scheme of the utility model is: comprising a rock core holder, a semi-sealed sample container, a lifting platform, a constant temperature box, a fixing support for the rock core holder, and a data acquisition system. The core holder is provided with a pressure filling port, and the filling port is externally connected with a through valve and a pressure stabilizing pump, and a gas flowmeter is connected to the pipeline drawn from the upper end of the core holder, and the gas flowmeter is connected with the data acquisition system. The opening of the semi-sealed sample container matches the size of the lower end of the rock core holder, and the semi-sealed sample container is connected to the lower end of the rock core holder in a semi-sealed connection.

Compared with the prior art, the utility model has the following advantages:

1. The core self-priming experimental device has a heating and pressurizing system, which can simulate different formation temperatures and pressures for core self-priming evaluation experiments. The operation is simple and convenient, data is automatically collected, and the accuracy is high. Reliable data provide a basis for evaluating the degree of water lock damage of low-permeability cores or selecting surfactants with a good effect of reducing water lock damage.

2. The core self-priming experimental device uses a micro gas flowmeter to measure the volume of the pores discharged due to core self-priming, and collects and processes it in real time through the data processing system to avoid errors in manual reading data. It is easy to operate and has good repeatability. The measurement error is small.

Description of drawings

Fig. 1 is a schematic diagram of a core self-priming experimental device for simulating formation conditions. Among them: 1 core holder, 2 semi-sealed sample container, 3 automatic lifting platform, 4 constant temperature box, 5 core holder fixed bracket, 6 through valve, 7 gas flow meter, 8 data acquisition system, 9 stabilized pressure pump .

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described

A core self-priming experimental device simulating formation conditions consists of a core holder 1, a semi-sealed sample container 2, an automatic lifting platform 3, a constant temperature box 4, a core holder fixing bracket 5, a passage valve 6, and a gas flow meter 7 , Data acquisition system 8, 9 components of regulator pump.

The low-permeability core self-absorption evaluation experiment is realized in the following steps:

1. Put the core into the core holder 1, and put the core holder 1 on the core holder fixing bracket 5 in the constant temperature box 4. Then a certain confining pressure is applied to the core holder 1 through the pressure stabilizing pump 9 and through the valve 6 to simulate the formation pressure and fix the core.

2. Put the test liquid sample into the semi-sealed sample container 2, and put the semi-sealed sample container 2 on the lifting platform 3 in the incubator 4.

3. Set the incubator 4 to a certain experimental temperature, turn on the power switch of the incubator 4, and start heating.

4. When the preset simulated formation temperature is reached, the lifting platform 3 is started, and when the test liquid sample in the semi-sealed sample container 2 just touches the bottom of the core, the lifting platform 3 is stopped. When the core self-priming occurs, gas will be discharged while a certain amount of liquid is sucked in, and the volume of gas in the core pores discharged by the self-priming of the core is measured by the gas flow meter 7 . While the bottom of the core is in contact with the test liquid sample, the gas flow meter 7 starts counting, and the data processing system 8 automatically collects and processes data at the same time.

The gas flow meter 7 is digital, so as to facilitate the cooperation of the existing data acquisition system.

Claims (2)

1. the rock core self-priming experimental provision of a simulation stratum condition; Comprise core holding unit (1), semitight sample receiver (2), hoistable platform (3), constant temperature oven (4), core holding unit fixed support (5), data acquisition system (DAS) (8); It is characterized in that: core holding unit (1) is provided with the pressure filling mouth; Filler is external through valve (6) and stabilized pressure pump (9); Connect gas meter (7) on the pipeline of on core holding unit (1), drawing, gas meter (7) is connected with data acquisition system (DAS) (8).

2. the rock core self-priming experimental provision of a kind of simulation stratum condition according to claim 1; It is characterized in that: the opening of semitight sample receiver (2) conforms to core holding unit (1) lower end size, and semitight sample receiver (2) is that semitight is docked with core holding unit (1) lower end.

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